Installation
Operation
Maintenance
UniTrane® Fan-Coil Room Conditioners
Force Flo™ Cabinet Heaters
Sizes 02-12
Low Vertical Fan-Coils
Sizes 03-06
Models
“LO” Design Sequence and Later
April 2000
UNT-IOM-6
Supercedes UNT-IOM-5
General Information
UniTrane® fan-coil and Force Flo™ cabinet heaters units are single
room units with load capabilities of 200 to 1200 cfmꢀ See Figure 1
for unit componentsꢀ Fan-coil units are available as 2-pipe with or
without electric heat (one hydronic circuit) or 4-pipe (two hydronic
circuits)ꢀ Force Flo™ units feature 2-pipe hydronic coils, electric heat
only, or steam onlyꢀ Also, units feature a variety of factory piping
packagesꢀ See the Appendix on page 100 for more information on
available factory-installed piping packagesꢀ
Three control options are available with the UniTrane® fan-coil and
Force Flo™ cabinet heater unitsꢀ
1ꢀ fan mode switch
2ꢀ Tracer® ZNꢀ010 and ZNꢀ510, ZNꢀ520
3ꢀ terminal unit controller (TUC)
All control options are available as unit or wall mountedꢀ Units with a
Tracer® ZNꢀ010, ZNꢀ510, ZNꢀ520 or TUC also feature a split combina-
tion: unit mounted fan mode switch with a wall mounted setpoint dialꢀ
The Tracer® controllers (ZNꢀ010, ZNꢀ510 and ZNꢀ520) utilize binary
outputs to operate 2-position control valves, supply fan/s, 2-position
dampers, and electric heatꢀ
The TUC utilizes binary outputs to control the fan and optional
auxiliary heatꢀ In addition, it operates 2-position or 3 wire floating
point control valves and the fresh air damperꢀ
Available supply and return openings vary with each cabinet styleꢀ In
addition, a fresh air opening with either a manual or motorized air
damper is an available optionꢀ See pages 4-5 for available cabinet
stylesꢀ
Hydronic coil
Piping package
Control panel
*Main drain pan
Supply fan(s)
Throwaway filter
Fan motor(s)
*Auxiliary
drain pan
*Featured on fan-coils only
Figure 1. Main components of a fan-coil or cabinet heater unit.
UNT-IOM-6
3
Cabinet Styles
Model B
Vertical Cabinet
Model C
Horizontal Concealed
Model D
Horizontal Cabinet
Model E
Horizontal Recessed
Model F
Wall Hung Cabinet**
4
UNT-IOM-6
Model J
Vertical Slope Top Cabinet
M
Low Vertical Cabinet*
Model K
Low Vertical Concealed*
Model M
Inverted V
Model N
Inverted Vertical Recessed**
*Fan-coil only
**Force Flo cabinet heater only
UNT-IOM-6
5
Each UniTrane® fan-coil and Force Flo ™ cabinet heater has a
multiple character model number unique to that particular unitꢀ To
determine a unit’s specific
Model Number
Description
options, reference the model
number on the unit nameplate
on the fan scrollꢀ The unit
nameplate also identifies the
serial number, sales order
number, and installation and
operating specificationsꢀ See
Figure 2 for the nameplate
locationꢀ
Reference pages 7-8 for a
detailed explanation of the
model numberꢀ
Figure 2. The unit nameplate is
on the fan scroll.
Complete the installation checklist on page 13 to ensure proper and
safe operationꢀ
6
UNT-IOM-6
Model Number Description
J
K
L
With piping, RH
With piping, LH
With piping, RH, extꢀ end pocket
With piping, RH, extꢀ end pocket
G
Keylock panel & access door
w/leveling feet
Digits 1 & 2 Unit Type
FC
FF
M
Digit 17 Motor
Digit 3 Model
A
B
Free discharge
High static
Digits 10 & 11 Design Sequence
LO
A
Vertical concealed
Vertical cabinet
concealed
B
CHorizontal
Digit 12 Inlet
D
E
F
H
J
K
L
M
N
Horizontal cabinet
Horizontal recessed
Vertical wall hung*
Vertical recessed
Vertical slope top
Low vertical concealed
Low vertical cabinet
Inverted vertical cabinet*
Inverted vertical recessed*
Digit 18 Coil
A
B
Front toe space
Front bar grille
A
B
C4
D
E
F
G
H
J
K
L
M
N
P
2 row cooling/heating
3 row cooling/heating
row
CFront
stamped
louver
cooling/heating
D
E
F
G
H
Bottom stamped louver
Bottom toe space
Back duct collar
Open return
2 row cooling, 1 row heating
2 row cooling, 2 row heating
3 row cooling, 1 row heating
2 row cooling or heating only
3 row cooling or heating only
4 row cooling or heating only
2 row cooling/heating, elecꢀ heat
3 row cooling/heating, elecꢀ heat
4 row cooling/heating, elecꢀ heat
Electric heat only, 1 stage
2 row cooling/heating,
1 row heating
Back stamped louver
Digit 13 Fresh Air Damper
Digit 4 Development Sequence
B
0
None
A
B
Manual, bottom opening
Manual, back opening
CManual,
top
opening
Digits 5–7 Unit Size
D
E
F
Auto, 2 posꢀ, bottom opening
Auto, 2 posꢀ, back opening
Auto, 2 posꢀ top opening
Auto, economizer,
020
030
040
060
080
100
120
200 cfm
300 cfm
400 cfm
600 cfm
800 cfm
1000 cfm
1200 cfm
Q
R
2 row cooling/heating,
2 row heating
3 row cooling/heating,
1 row heating
G
bottom opening
U
V
W
Electric heat only, 2 stage
Electric heat only, low kw, 1 stage
Steam coil
H
J
K
L
Auto, economizer, back opening
Auto, economizer, top opening
No damper, bottom opening
No damper, back opening
No damper, top opening
Digit 19 Coil Fin Series
144
M
Digit 8 Unit Voltage
2
1
2
3
4
5
6
7
8
9
A
B
115/60/1
208/60/1
277/60/1
230/60/1
208/60/3
230/6j0/3
480/60/3
110-120/50/1
220-240/50/1
220-240/50/3
380-415/50/3
Digit 14 Outlet
Digit 20 Air Vent
A
Front duct collar
A
M
Automatic
Manual
B
Front bar grille
stamped
CFront
louver
D
E
F
G
H
J
Front quad grille
Bottom duct collar
Bottom stamped louver
Top quad grille
Top bar grille
Digits 21, 22, & 23 Electric Heat kW
[208 V kW derate in brackets]
000
010
015
020
025
030
040
045
050
060
070
075
080
100
105
110
120
135
150
None
1ꢀ0 [0ꢀ75]
1ꢀ5 [1ꢀ1]
2ꢀ0 [1ꢀ5]
2ꢀ5 [1ꢀ9]
3ꢀ0 [2ꢀ2]
4ꢀ0 [3ꢀ0]
4ꢀ5 [3ꢀ3]
5ꢀ0 [3ꢀ7]
6ꢀ0 [4ꢀ4]
7ꢀ0 [5ꢀ3]
7ꢀ5 [5ꢀ7]
8ꢀ0 [6ꢀ0]
10ꢀ0
Top duct collar
Bottom bar grille
K
Digit 9 Piping System Placement
A
Digit 15 Color
W/o piping, RH connꢀ,
w/o auxꢀ drain pan
W/o piping, LH connꢀ,
w/o auxꢀ drain pan
0
1
2
None
Deluxe beige
Soft dove
B
3
Cameo white
Driftwood grey
Stone grey
CW/o
piping,
RH
connꢀ,
4
5
6
w/ auxꢀ drain pan
W/o piping, LH connꢀ,
w/ auxꢀ drain pan
W/o piping, RH connꢀ,
w/o auxꢀ drain pan,
extꢀ end pocket
W/o piping, LH connꢀ,
w/o auxꢀ drain
W/o piping, RH connꢀ,
w/ auxꢀ drain pan,
extꢀ end pocket
D
E
Rose mauve
10ꢀ5 [7ꢀ9]
11ꢀ0 [9ꢀ0]
12ꢀ0
13ꢀ5 [10ꢀ2]
15ꢀ0
Digit 16 Tamperproof Locks
& Leveling Feet
F
0
None
A
B
Keylock panel
Keylock access door
panel
G
180
200
18ꢀ0 [13ꢀ5]
20ꢀ0 [15ꢀ0]
CKeylock
&
access
door
D
E
F
Leveling feet
H
W/o piping, LH connꢀ,
w/ auxꢀ drain pan, extꢀ end
pocket
Keylock panel with leveling feet
Keylock access door
w/leveling feet
*Force Flo™ cabinet heater only
UNT-IOM-6
7
R
7” falseback
CBall
valve
setter
supply
&T
a8u”tofalseback circuit
Digit 24 Reheat
0
A
B
None
Steam
Hot water
D
E
F
Ball valve supply & return
w/strainers & unions
Ball valve supply & manual circuit
setter w/strainers & unions
Ball valve supply & auto circuit
setter w/strainers & unions
Digit 40 Main Auto Circuit Setter GPM
0
None
0ꢀ5
0ꢀ75
1ꢀ0
1ꢀ5
2ꢀ0
2ꢀ5
3ꢀ0
3ꢀ5
4ꢀ0
K
L
4ꢀ5
5ꢀ0
6ꢀ0
7ꢀ0
8ꢀ0
A
B
C
D
E
F
G
H
J
M
N
P
Q
R
T
Digit 25 Disconnect Switch
0
None
D
With disconnect
9ꢀ0
10ꢀ0
11ꢀ0
12ꢀ0
Digit 30 Control Type
Digit 26 Filter
A
Fan Speed Switch
0
1
2
3
4
5
6
7
8
None
1” TA
U
CTUC
D
E
F
TUC w/Trane ICS
Tracer® ZNꢀ010
Tracer® ZNꢀ510
Tracer® ZNꢀ520
1” TA pltdꢀ media
1” TA + 1 extra
1” TA pltdꢀ media + 1 extra
1” TA + 2 extra
1” TA pltdꢀ media + 2 extra
1” TA + 3 extra
1” TA pltdꢀ media + 3 extra
Digit 41 Auxiliary Auto Circuit Setter GPM
G
K
L
4ꢀ5
5ꢀ0
6ꢀ0
7ꢀ0
8ꢀ0
9ꢀ0
10ꢀ0
11ꢀ0
12ꢀ0
0
None
0ꢀ5
0ꢀ75
1ꢀ0
1ꢀ5
2ꢀ0
2ꢀ5
3ꢀ0
3ꢀ5
4ꢀ0
A
B
C
D
E
F
G
H
J
M
N
P
Q
R
T
Digit 31 Control Options
D
K
V
Unit mtdꢀ fan mode switch (OHML)
Wall mtdꢀ fan mode switch (OHML)
Unit mtdꢀ zone sensor, w/SP
rotary, & fan mode switch
(OAHML),
Digit 27 Main Control Valve
0
None
U
A
B
C2
D
E
F
G
H
J
2 way, 2 posꢀ, NꢀOꢀ (25 psig)
3 way, 2 posꢀ, NꢀOꢀ (30 psig)
way,
W
Wall mtdꢀ zone sensor w/
SP rotary, & fan mode switch
(OAHML),
2
posꢀ,
ꢀ
NꢀC (25
psig)
3 way, 2 posꢀ, NꢀCꢀ (15 psig)
2 way, 2 posꢀ, NꢀOꢀ (50 psig)
3 way, 2 posꢀ, NꢀOꢀ (50 psig)
2 way, 2 posꢀ, NꢀCꢀ (50 psig)
3 way, 2 posꢀ, NꢀCꢀ (50 psig)
2 way, modꢀ, Cv = 0ꢀ7 (50 psig)
3 way, modꢀ, Cv = 0ꢀ7 (50 psig)
2 way, modꢀ, Cv = 1ꢀ5 (50 psig)
3 way, modꢀ, Cv = 1ꢀ5 (50 psig)
2 way, modꢀ, Cv = 2ꢀ5 (50 psig)
3 way, modꢀ, Cv = 2ꢀ5 (50 psig)
2 way, modꢀ, Cv = 4ꢀ0 (50 psig)
3 way, modꢀ, Cv = 4ꢀ0 (50 psig)
X
Unit mtdꢀ fan mode switch, wall
mtdꢀ setpoint dial zone sensor
Digit 42 Subbase
0
None
A
B
C4”
D
E
2” height
3” height
height
5” height
6” height
7” height
Digit 32-34 Future Control Options
K
L
Digit 35 Control Function 3
M
N
P
Q
R
F
0
2
None
Condensate overflow detection
Digit 43 Recessed Flange
0
None
Digit 36 Control Function 4
A
Recessed flange
0
2
None
Low temperature detection
Digit 28 Auxiliary Control Valve
0
None
Digit 44 Wallbox
A
B
C2
D
E
F
G
H
J
2 way, 2 posꢀ, NꢀOꢀ (25 psig)
3 way, 2 posꢀ, NꢀOꢀ (30 psig)
way,
0
None
Digits 37 & 38 Future Control Options
ꢀ NꢀC (25 psig)
A
Anodized
2
posꢀ,
3 way, 2 posꢀ, NꢀCꢀ (15 psig)
2 way, 2 posꢀ, NꢀOꢀ (50 psig)
3 way, 2 posꢀ, NꢀOꢀ (50 psig)
2 way, 2 posꢀ, NꢀCꢀ (50 psig)
3 way, 2 posꢀ, NꢀCꢀ (50 psig)
2 way, modꢀ, Cv = 0ꢀ7 (50 psig)
3 way, modꢀ, Cv = 0ꢀ7 (50 psig)
2 way, modꢀ, Cv = 1ꢀ5 (50 psig)
3 way, modꢀ, Cv = 1ꢀ5 (50 psig)
2 way, modꢀ, Cv = 2ꢀ5 (50 psig)
3 way, modꢀ, Cv = 2ꢀ5 (50 psig)
2 way, modꢀ, Cv = 4ꢀ0 (50 psig)
3 way, modꢀ, Cv = 4ꢀ0 (50 psig)
Digit 39 Recessed Options
0
None
A
B
Standꢀ 5/8” recessed panel
2” projection panel
C2ꢀ5”
D
E
projection
panel
K
L
3” projection panel
3ꢀ5” projection panel
4” projection panel
4ꢀ5” projection panel
5” projection panel
5ꢀ5” projection panel
6” projection panel
2” falseback
M
N
P
Q
R
F
G
H
J
K
L
M
N
P
3” falseback
4” falseback
5” falseback
6” falseback
Digit 29 Piping Package
0
None
A
B
Ball valve supply & return
Ball valve supply & manual circuit
setter return
Q
8
UNT-IOM-6
Receiving and Handling
UniTrane® fan-coil and Force Flo™ cabinet heaters ship in individual
cartons for maximum protection during shipment and for handling and
storage easeꢀ Each carton has tagging information such as the
model number, sales order number, serial number, unit size, piping
connections, and unit style to help properly locate the unit in the floor
planꢀ If specified, the unit will ship with tagging designated by the
customerꢀ
Complete the following checklist before accepting delivery of units to
detect any shipping damageꢀ
o
1ꢀ Inspect each piece of the shipment before accepting itꢀ
Check for rattles, bent carton corners, or other visible indications of
shipping damageꢀ
o
2ꢀ If the carton appears damaged, open it immediately and
inspect the contents before acceptingꢀ Do not refuse the shipmentꢀ
Make specific notations concerning the damage on the freight billꢀ
Check the unit casing, fan rotation, coils, condensate pan, filters, and
all options or accessoriesꢀ
o
3ꢀ Inspect the unit for concealed damage and missing compo-
nents soon after delivery and before storingꢀ Report concealed
damage to the delivering carrier within the allotted time after
delivery (check with the carrier on the allotted time to submit a
claim)ꢀ
o
4ꢀ Do not move damaged material from the receiving location if
possibleꢀ It is the receiver’s responsibility to provide reasonable
evidence that concealed damage did not occur after deliveryꢀ
o
5ꢀ Do not continue to unpack shipment if it appears damagedꢀ
Retain all internal packing, cartons, and crateꢀ Take photos of the
damaged material if possibleꢀ
o
6ꢀ Notify the carrier’s terminal of damage immediately by phone
and mailꢀ Request an immediate joint inspection of the damage by
the carrier and consigneeꢀ
o
7ꢀ Notify the Trane sales representative of the damage and
arrange for repairꢀ Have the carrier inspect the damage before begin-
ning any repairs to the unitꢀ
UNT-IOM-6
9
This unit is intended for indoor use onlyꢀ To protect the unit from
damage due to the elements and prevent it from possibly becoming a
contaminant source for IAQ problems, store the unit indoorsꢀ If indoor
storage is not possible, the Trane Company makes the following
provisions for outdoor storage:
Jobsite Storage
1ꢀ Place the unit(s) on a dry surface or raised off the ground to assure
adequate air circulation beneath unit and to assure that no portion of
the unit contacts standing water at any timeꢀ
2ꢀ Cover the entire unit with a canvas tarp onlyꢀ Do not use clear,
black or plastic tarps as they may cause excessive moisture conden-
sation and equipment damageꢀ
Note: Wet interior unit insulation can become an amplification site for
microbial growth (mold), which may cause odors and health-related
indoor air quality problemsꢀ If there is visable evidence of microbial
growth (mold) on the interior insulation, remove and replace the
insulation prior to operating the systemꢀ Refer to the “Inspecting and
Cleaning the Internal Insulation” section on page 123 for more
informationꢀ
10
UNT-IOM-6
Complete the following checklist before installing the unitꢀ
1ꢀ Clearances
Installation
Considerations
o
Allow adequate space for free air circulation, service clearances,
piping and electrical connections, and any necessary ductworkꢀ For
specific unit dimensions, refer to the submittalsꢀ Allow clearances
according to local and national electric codesꢀ See the following
section on “Service Access” and refer to Figure 3 on page 12 for
recommended service and operating clearancesꢀ Provide removable
panels for concealed unitsꢀ
o
2ꢀ Structural Support
The floor should be strong enough to adequately support floor
mounted unitsꢀ The installer is responsible to supply adequate
support rods for installation of ceiling unitsꢀ
o
3ꢀ Level
If necessary, prepare the floor or ceiling to ensure the unit installation
is level (zero tolerance) in both horizontal axis to allow proper
operationꢀ
Set the unit level using the chassis end panels as a reference pointꢀ
Do not use the coil or drain pan as the reference point since the coil
is pitched and the drain pan has an inherent positive slope to provide
proper drainageꢀ
o
4ꢀ Condensate Line
A continuous pitch of 1 inch per 10 feet of condensate line run is
necessary for adequate condensate drainageꢀ
o
5ꢀ Wall and Ceiling Openings
Recessed units only:
Refer to the submittal for specific dimensions of wall or ceiling
openings before attempting to install the unitꢀ
Horizontal concealed units only:
The installation of horizontal concealed units must meet the require-
ments of the National Fire Protection Association (NꢀFꢀPꢀAꢀ) Stan-
dard 90A or 90B concerning the use of concealed ceiling spaces as
return air plenumsꢀ
o
6ꢀ Exterior
Touch up painted panels if necessaryꢀ If panels need paint, sanding
is not necessaryꢀ However, clean the surface of any oil, grease, or
dirt residue so the paint will adhereꢀ Purchase factory approved touch
up epoxy paint from your local Trane Service Parts Center and applyꢀ
UNT-IOM-6
11
Service access is available from the front on vertical units and from
the bottom on horizontal unitsꢀ Cabinet and recessed units have
removable front or bottom panels to allow access into the unitꢀ See
Figure 3 for recommended service and operating clearancesꢀ
Service
Access
Units have either right or left hand pipingꢀ Reference piping locations
by facing the front of the unit (airflow discharges from the front)ꢀ The
control panel is always on the end opposite the pipingꢀ
The unit has a modular fan board assembly that is easy to removeꢀ
Also, the main drain pan is easily removable for cleaningꢀ See the
“Maintenance” section beginning on page 88 for more details on
servicingꢀ
8ꢀ5 inꢀ
both sides
12 inꢀ
both sides
24 inꢀ
Vertical
Conceal
Recessed
A
Vertical or Low
36 inꢀ
Vertical Cabinet
A
3 inꢀ
12 inꢀ
both sides
8ꢀ5 inꢀ
both sides
24 inꢀ
C
Horizontal Concealed
or Recessed
28 inꢀ
6 inꢀ
Horizontal
Cabinet
B
28 inꢀ
A- Front Access or Front Free Discharge
B- Control Access Door
C- Front Free Discharge
D- Back Louvered Return
Figure 3. Recommended Service and Operating Clearances
12
UNT-IOM-6
Installation Checklist
The following checklist is only an abbreviated guide to the detailed
installation procedures given in this manualꢀ Use this list to ensure all
necessary procedures are completeꢀ For more detailed information,
refer to the appropriate sections in this manualꢀ
WARNING: Allow rotating fan to stop before
servicing equipment. Failure to do so may cause severe
personal injury or death.
!
o
o
1ꢀ Inspect the unit for shipping damageꢀ
2ꢀ Level installation location to support the unit weight ad-
equatelyꢀ Make all necessary wall or ceiling openings to allow
adequate air flow and service clearancesꢀ
o
3ꢀ Ensure the unit chassis is levelꢀ
CAUTION: The unit must be installed level (zero
!
tolerance) in both horizontal axis for proper operation.
Failure to do so may result in condensate management
problems such as standing water inside the unit. Stand-
ing water and wet surfaces may result in microbial
growth (mold) in the drain pan that may cause unpleasnt
odors and serious health-related indoor air quality prob-
lems.
o
4ꢀ Secure the unit and any accessory items properly to the
wall or ceiling support rodsꢀ
o
o
5ꢀ Complete piping connections correctlyꢀ
6ꢀ Check field sweat connections for leaks and tighten the
valve stem packing, if necessaryꢀ
o
7ꢀ Install the auxiliary drain pan properly under piping package
on fan-coil unitsꢀ
o
8ꢀ Pitch condensate drain line 1 inch drop per 10 feet of line
run on fan-coil unitsꢀ
UNT-IOM-6
13
o
unitsꢀ
9ꢀ Complete condensate drain line connections on fan-coil
o
10ꢀ Install automatic changeover sensor option on the
supply water lineꢀ
o
11ꢀ Install automatic electric heat lockout switch option on
the supply water lineꢀ
o
12ꢀ Install condensate overflow switch option correctly on
the auxiliary drain panꢀ
o
o
o
13ꢀ Install the low temperature detection device option correctlyꢀ
14ꢀ Complete all necessary duct connectionsꢀ
15ꢀ Complete all interconnection wiring for the wall mounted fan
mode switch or zone sensor per the wiring schematic and guidelines
established in the “Wall Mounted Control Interconnection Wiring”
section on page 35ꢀ
o
16ꢀ Install the wall mounted fan mode switch, or zone sensor
module options properlyꢀ
o
17ꢀ Connect electrical supply power according to the NEC and
unit wiring diagramsꢀ
o
19ꢀ Remove any miscellaneous debris, such as sheetrock, that
may have infiltrated the unit during constructionꢀ
o
20ꢀ Replace the air filter as requiredꢀ
14
UNT-IOM-6
Installing the Unit
Before beginning installation, refer to Table 1 on page 17 for unit
weights and Figure 3 on page 12 for service and operating clearancesꢀ
In addition, refer to the unit submittal for installation detailsꢀ
CAUTION: Do not allow electrical wire to fall
!
between the unit and installation surface. Failure to
comply may cause electrical shorts or difficulty in access-
ing wires.
Install vertical units in an upright position using the 5/8 inch diameter
double key slot hanger holes, located on the back of unitꢀ The hanger
holes allow a maximum shank size of 5/16 inch diameter threaded
rods or lag screws (installer provides)ꢀ Follow the installation proce-
dure belowꢀ
Vertical Units
1ꢀ Prepare wall openings for recessed unitsꢀ Reference unit submittal
for each unit size dimensionsꢀ
2ꢀ If the unit has leveling legs, adjust them correctly to level unitꢀ
3ꢀ Mark the position of the keyslot hanger holes on the wall according
to the dimensions given in Figure 4 for each unit sizeꢀ Align the
hole locations evenlyꢀ
Cabinet & Concealed Units
Size
02
03
04
06
08
10
12
L (in>)
21 1/4
21 1/4
26 1/4
35 3/4
44 1/4
63 1/4
63 1/4
L
Low Vertical Cabinet & Concealed
Size
03
04
L (in>)
26 1/4
35 3/4
44 1/4
06
L
15ꢀ5 inꢀ
12ꢀ19 inꢀ
7ꢀ5 inꢀ
Floor Level
Floor Level
Figure 4. Keyslot Hanger Hole Locations
UNT-IOM-6
15
4ꢀ Insert the threaded rods or lag screws in the wall before setting the
unit in placeꢀ
5ꢀ Remove the front panel (cabinet unit only) by lifting it upwardꢀ
6ꢀ Position the hanger holes, located on the back of the unit, over the
rod or lag screw heads, pushing the unit downward to properly
positionꢀ
7ꢀ Complete piping and wiring connections, in addition to any neces-
sary ductwork to the unit as instructed in the following sectionsꢀ
Ensure that the auxiliary drain pan is in position on fan-coil unitsꢀ
8ꢀ Install the front panel before starting the unitꢀ
On cabinet units, replace the front panel by aligning the bottom tabs
on the unit with the respective slots on the panel bottomꢀ Align the
top edge of the unit with the panelꢀ
On recessed units, install the front panel by aligning and locking
together the interlocking support channel of the panel and unitꢀ While
holding the panel against the unit, tighten the screws at the top of the
panel until it fits tight against the unit’s frontꢀ Do not over tighten the
screwsꢀ
CAUTION: All unit panels and filters must be in
place prior to unit start-up. Failure to have panels and
filters in place may cause motor overload.
!
Install horizontal units suspended from the ceiling using the four 5/8
inch diameter double key slot hanger holes, located on the top of the
unitꢀ The hanger holes allow a maximum shank size of 5/16 inch
diameter threaded rods or lag screws (installer provided)ꢀ Follow the
installation procedure belowꢀ
Horizontal Units
Note: Follow the requirements of National Fire Protection Association
(NFPA) Standard 90A or 90B, concerning the use of concealed
ceiling spaces as return air plenumsꢀ
1ꢀ Prepare the ceiling opening for recessed unitsꢀ Reference the unit
submittals for each unit size dimensionsꢀ
16
UNT-IOM-6
2ꢀ Position and install the suspension rods or a suspension device
(supplied by installer) according to the unit size dimensions in
Figure 4 on page 15ꢀ Also refer to the weight range chart given in
Table 1ꢀ
3ꢀ On cabinet units, remove the bottom panel by using a 5/32 inch
Allen wrench to unscrew fastenersꢀ Swing the panel down and lift
outwardꢀ
4ꢀ Level the unit by referencing the chassis end panelsꢀ Adjust the
suspension deviceꢀ
5ꢀ Complete piping and wiring connections, in addition to any neces
sary ductwork as instructed in the following sectionsꢀ Ensure that
the auxiliary drain pan is in position on fan-coil unitsꢀ
6ꢀ Install the bottom panel before starting the unitꢀ
7ꢀ Ensure condensate drain line is pitched 1 inch per 10 feet of pipe
away from fan-coil unitꢀ
Table 1ꢀ Unit Operating Weights, pounds (kg)
Unit
Size Models
Cabinet
Concealed
Models
Recessed
Models
Low Vertical
Cabinet Models
Low Vertical
Concealed
Models
02
03
04
06
08
10
12
84 (38)
84 (38)
68 (31)
68 (31)
96 (44)
123 (56)
131 (59)
182 (83)
182 (83)
68 (31)
68 (31)
NA
NA
112 (51)
139 (63)
148 (67)
NA
96 (44)
123 (56)
131 (59)
NA
112 (51)
139 (63)
148 (67)
200 (91)
200 (91)
78 (35)
118 (54)
129 (59)
243 (110)
243 (110)
NA
NA
NA
NA
Note: All weights are approximateꢀ Individual weights may vary depending upon the unit’s optionsꢀ
UNT-IOM-6
17
Cabinet units:
Install the bottom panel by placing the hinged end on the unit’s hinged
end (always at the return end of the unit)ꢀ See Figure 4 on page 15 for
keyslot hanger hole locationsꢀ Swing the panel upward into positionꢀ
Tighten the panel to the unit with the fasteners providedꢀ Do not over-
tighten the fastenersꢀ
Recessed units:
See Figure 5 on page 19 and follow the procedure belowꢀ
· Insert the mounting bolts through the panel brackets of the trim ring
and secure to the hanger holes on the unitꢀ Tighten the mounting
bolts to pull the trim ring snug against the finished ceilingꢀ
· Install the bottom panel by placing the hinged end on the trim ring
hinged end (always at the unit’s return end)ꢀ
· Adjust the inner duct of the expansion collar (on units with a bottom
return) to ensure a tight fit against the insulation located on the
perimeter of the bottom panel’s return louverꢀ
· Safety chain assembly: close s-hook on each end of chainꢀ Insert s-
hooks through holes in unit and doorꢀ Close s-hook on doorꢀ
· Insert retaining screws through bottom panel door and place
retaining rings on screwsꢀ
· Swing the bottom panel upward into positionꢀ Hook the safety chain
to the bottom panel and the unitꢀ Tighten the panel to the unit with
the fasteners providedꢀ Do not over tighten the removable front
access panelꢀ
CAUTION: All unit panels and filters must be in
place prior to unit start-up. Failure to have panels and
filters in place may cause motor overload.
!
Note: The trim ring assembly cannot accomodate unlevel ceilingsꢀ
18
UNT-IOM-6
Figure 5. Trim ring assembly installation.
UNT-IOM-6
19
Startup Checklist
o
o
1ꢀ Ensure all panels are in placeꢀ
2ꢀ Tighten unions adequately if unit has a factory deluxe piping
packageꢀ
o
3ꢀ Properly vent the hydronic coil to allow water flow through the
unitꢀ
o
4ꢀ Set water flow to the unit properly if unit piping has the circuit
setter valveꢀ
o
5ꢀ Check strainers (if supplied) for debris after applying system
waterꢀ
o
6ꢀ Install the auxiliary drain pan and route the main drain pan
hoses to the auxiliary drain pan on vertical fan-coil unitsꢀ
o
o
o
7ꢀ Ensure all grille options are in placeꢀ
8ꢀ Ensure the air filter is in placeꢀ
9ꢀ Set the damper position to allow the fresh air requirement on
units with a fresh air damperꢀ
Note: Some circumstances may require the unit to run before building
construction is completeꢀ These operating conditions may be beyond
the design parameters of the unit and may adversely affect the unitꢀ
Insulate all cold surfaces to prevent condensationꢀ Moisture mixed
with accumulated dirt and organic matter may create an amplification
site for microbial growth (mold) causing unpleasant odors and health-
related indoor air quality (IAQ) problemsꢀ
External Insulating
Requirements
The Trane Company recommends field-insulation of the following
areas to prevent potential condensate and IAQ problems:
1ꢀ Supply and return water piping connections
2ꢀ Condensate drain lines and connections
3ꢀ Fresh air intake duct connections
4ꢀ Discharge duct connections
5ꢀ Wall boxes
20
UNT-IOM-6
Piping
Before installing field piping to the coil, consider the following ꢀ
Units with
Hydronic Coil
Connections Only
Piping Considerations
· All coil connections are 5/8 inch OꢀDꢀ (or 1/2 inch nominal) female
copper connectionsꢀ
· The supply and return piping should not interfere with the auxiliary
drain pan or condensate lineꢀ See “Connecting the Condensate
Drain” section on page 25 for more detailed informationꢀ
· The installer must provide adequate piping system filtration and
water treatmentꢀ
· Condensate may be an issue (fan-coils only) if field piping does not
have a control valveꢀ
Refer to Figure 6 for supply and return header locationsꢀ
CAUTION: When using a field supplied piping
!
package in a fan-coil unit, allow sufficient room to install
the auxiliary drain pan. In addition, piping package must
not extend over edges of auxiliary drain pan.
2-Pipe
4-Pipe (C)
2-Pipe
4-Pipe (C)
R
S
R
S
R
R
4-Pipe (H)
4-Pipe (H)
S
Air flow
S
Air flow
Right end view of coil
Left end view of coil
Figure 6. Supply and return header locations on the hydronic
coil.
Connecting field piping to coil:
1ꢀ Slide a 1/2 inch sweat connection coupling (installer provided) onto
the coil headersꢀ
2ꢀ Remove the auxiliary drain pan, if it is in place, to prevent exposure
to dripping solder or excessive temperaturesꢀ
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21
Note: For vertical fan-coil units, push the main condensate drain
hose and overflow condensate drain hose through to the inside of the
chassis end panel to prevent them from being burned when making
sweat connectionsꢀ Be sure to pull the hoses back through and route
to the auxiliary drain pan when the end panel has cooledꢀ
3ꢀ Solder the joint using bridgit lead-free solder (ASTM B32-89) to
provide a watertight connectionꢀ Avoid overheating factory soldered
joints when soldering field connections to the coil to prevent
leakage from occurringꢀ
4ꢀ Insulate all piping to coil connections as necessary after connec-
tions are completeꢀ
Note: Maintain a minimum distance of one foot between the reduction
fitting for the 1/2 inch diameter line and the fan-coil unit piping
connectionsꢀ
Install the auxiliary drain pan, which ships in the accessory packet
Units with Steam
Coils
CAUTION: In all steam coil installations, the con-
!
densate return connections must be at the low point of
the coil to ensure condensate flows freely from the coil
at all times. Failure to do so may cause physical coil
damage from water hammer, unequal thermal stresses,
freeze-up and/or corrosion.
1ꢀ Make piping connections to the steam coil as shown in Figure 7ꢀ
Cap the unused connectionꢀ
2ꢀ The coil is already pitched within the unit to provide proper pitch to
drain condensate out of the coilꢀ Ensure that the unit has been
properly leveledꢀ Refer to page 13 for unit leveling instructionsꢀ
3ꢀ Install a 1/2 inch, 15-degree swing check vacuum breaker in the
unused condensate return tapping as close as possible to the coilꢀ
Figure 7. Steam coil header ports. The center port is the supply
connection. The return port is below the supply. The top port
must be closed off.
22
UNT-IOM-6
4ꢀ Vent the vacuum breaker line to atmosphere or connect it into the
return main at the discharge side of the steam trapꢀ
5ꢀ Pitch all steam supply and return mains down a minimum of 1 inch
per 10 feet in the direction of flowꢀ
6ꢀ Do not drain the steam mains or take-off through the coilsꢀ Drain
the mains ahead of the coils through a steam trap to the return lineꢀ
7ꢀ Overhead returns require 1 psig of pressure at the steam trap
discharge for each 2-foot elevation to ensure continuous condensate
removalꢀ
8ꢀ Proper steam trap selection and installation is necessary for
satisfactory coil performance and service lifeꢀ For installation, use the
following steps:
aꢀ Locate the steam trap discharge at least 12 inches below the
condensate return connectionꢀ This provides sufficient hydrostatic
head pressure to overcome trap losses and ensure complete conden-
sate removalꢀ
bꢀ Trane Company recommends using flat and thermostatic traps
because of gravity drain and continuous discharge operationꢀ
cꢀ Use float and thermostatic
traps with atmospheric pressure
gravity condensate return, with
automatic controls or where the
possibility of low pressure supply
steam existsꢀ
ST = Strainer
FT = Float and
thermostatic
steam trap
MV = Manual
air vent
GV= Gate valve
VB = Vacuum
breaker, 15°
swing check
valve
dꢀ Always install strainers as
close as possible to the trap inlet
sideꢀ
Reference Figure 8 for an ex-
ample of a properly piped steam
coilꢀ
Figure 8. Example of typical piping to the steam coil.
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23
Before installing water piping supply and return lines to factory
piping package, note the following itemsꢀ
Factory Piping
Package
Connections
· All piping connections are 5/8 inch OꢀDꢀ (1/2 inch nominal) female
copper connectionsꢀ
Piping Considerations
· The fan-coil supply and return piping should not interfere with the
auxiliary drain pan or condensate lineꢀ See “Connecting the
Condensate Drain” section on page 25 for more informationꢀ
· The installer must provide adequate piping system filtration and
water treatmentꢀ
· If the unit has a factory deluxe piping package, the piping includes
a strainer with a 20 mesh size screen, which allows minimal
protection from debrisꢀ Therefore, clean the strainer regularlyꢀ
NOTE: Maintain a minimum distance of one foot between the
reduction fitting for the 1/2 inch diameter line and the fan-coil piping
connectionsꢀ
Connecting Water Piping to
Factory Piping Package
1ꢀ The factory piping package ships with brackets to adequately
support the piping during shipmentꢀ Remove these brackets before
connecting water piping to the unitꢀ See Figure 9ꢀ
2ꢀ Close the piping end valves to the fully open position to prevent
damage to the valve seat during brazingꢀ
3ꢀ Remove the auxiliary drain pan, if it is in place, to prevent expo-
sure to dripping solder or excessive temperaturesꢀ
4ꢀ Solder water piping connections to supply and return end
connectionsꢀ Avoid overheating
factory soldered joints to
prevent the possibility of
leakageꢀ
5ꢀ Insulate fan-coil piping to
auxiliary drain pan connections
and anypiping that is not above
the auxiliary drain panꢀ
Figure 9. Remove the shipping
brackets which support the
factory piping package before
connecting piping.
24
UNT-IOM-6
The auxiliary drain pan ships loose with a fan-coil unit with factory
pipingꢀ To install the auxiliary drain pan, insert the tabs, located on
the side of the drain pan, into the slots located in the chassis end
panelꢀ Slide the pan into the narrow groove section to lock into placeꢀ
See Figures 10 and 11ꢀ Make sure the auxiliary pan is pushed all the
way into the fully locked positionꢀ
Installing the
Auxiliary Drain
Pan
Note: The function of the auxiliary drain pan is to collect condensate
from the main drain pan and the factory installed piping package onlyꢀ
It also provides a convenient field connection for the condensate
drain line for units without factory pipingꢀ Moreover, the auxiliary drain
pan may not be adequate to collect condensate from a field-installed
piping packageꢀ Apply additional insulation as neededꢀ
Figure 10. Insert the auxiliary
drain pan tabs into these slots
in the fan-coil chassis end
panel.
Figure 11. The horizontal
auxiliary drain pan in its
installed position.
1ꢀ De-burr the pipe end before making the connection to the drain panꢀ
Connecting the
Condensate Drain
2ꢀ Connect a 7/8 inch OꢀDꢀ copper pipe or tube, with a 0ꢀ20 inch wall
thickness, to the auxiliary drain panꢀ This should be a mechanical
connection that allows easy removal of the auxiliary drain pan when
servicing the piping end pocketꢀ
3ꢀ Slide the copper pipe over the drain pan nipple and tighten the
collar on the pipe with a hose clamp (installer supplied)ꢀ
Maintain a continuous drain line pitch of 1 inch per 10 feet of drain line
run to provide adequate condensate drainageꢀ Extend the drain line
straight from the drain pan a minimum distance of 6 inches before
making any turnsꢀ The installer must provide proper support for the
drain line to prevent undue stress on the auxiliary drain panꢀ
Install a secondary overflow drain line if necessary by punching out
the overflow drain nipple on the auxiliary drain panꢀ Next, place a 3/8
UNT-IOM-6
25
inch inside diameter flexible plastic tube over the nipple and secure
with a field supplied hose clampꢀ
Note: The installer is responsible for adequately insulating field
pipingꢀ See the “External Insulating Requirements section on page 20
for more informationꢀ
The condensate overflow detection device is an option on fan-coil
units with either a Tracer® ZNꢀ010, ZNꢀ510, ZNꢀ520 or TUC controlꢀ
The float switch, mounting bracket, and coiled leads ship attached
inside the piping end pocket of the unitꢀ Install the switch by placing
the hole or slot in the bracket over the condensate overflow drain (of
the auxiliary drain pan) with the switch float extending over the panꢀ
Secure the drain pan by attaching the pan’s bracket with the factory
provided clipꢀ See Figures 12 and 13ꢀ
Condensate
Overflow
Detection Device
Figure 13. Condensate
Figure 12. Condensate
overflow switch installed in a
horizontal auxiliary drain pan.
overflow switch installed in a
vertical auxiliary drain pan.
Two-pipe changeover units with either the Tracer® ZNꢀ010, ZNꢀ510,
ZNꢀ520 or TUC control have an automatic changeover sensor that
determines heating or cooling mode based on the supply water
temperatureꢀ On units with a factory piping package, the factory
straps the changeover sensor to the piping supply water pipeꢀ See
Figure 14 on page 27ꢀ
Automatic
Changeover
Sensor
If the unit does not have a factory piping package, the factory at-
taches the sensor and coiled lead wires to the piping side end panelꢀ
The installer should attach the sensor parallel to and in direct contact
with the supply water pipeꢀ
Note: The installer is responsible to ensure the changeover sensor is
installed in a location that can sense active water temperatureꢀ
Otherwise, the unit may fail to sense the correct operating mode and
disable temperature controlꢀ
26
UNT-IOM-6
When using field supplied 3-way valves, position the changeover
sensor upstream of the valve on the supply water pipeꢀ
Recommendation: When using field supplied 2-way control
valves, attach the changeover sensor in a location that will
detect an active water temperatureꢀ The unit must always be
able to sense the correct
system water temperature,
regardless of the control valve
positionꢀ
Note: The maximum length of
the automatic changeover wire
cannot exceed 10 feet from the
control panelꢀ If the sensor
extends beyond the unit chassis,
use shielded conductors to
eliminate radio frequency
interference (RFI)ꢀ
Figure 14. The changeover
sensor strapped to the supply
water pipe.
Two-pipe fan-coil units with auxiliary electric heat have an automatic
electric heat lockout switch that disengages the electric heat when
hydronic heat enablesꢀ If the unit has a factory piping package and
electric heat, the factory attaches the switch to the supply water
pipeꢀ When the lockout switch detects the supply water temperature
above 95° F, it disengages the
Automatic Electric
Heat Lockout
Switch (Fan-coil)
electric heatꢀ This eliminates
electric heat and hydronic heat
working simultaneouslyꢀ
If the fan-coil unit does not have
a factory piping package, the
factory attaches the switch and
coiled lead wires to the piping
side end panelꢀ The installer
should position the lockout
switch on the supply water line of
the unit by sliding its spring
connector over the pipeꢀ
See Figure 15ꢀ
Figure 15. Units with electric
heat have an electric heat
lockout switch on the supply
water pipe.
UNT-IOM-6
27
The hydronic coil contains a vent, either manual or automatic, to
release air from the unitꢀ This vent is not sufficient for venting the
water piping system in the buildingꢀ
Venting the Hydronic
Coil
Locate the coil air vent on the piping side, above the coil connections
on the unitꢀ Perform the following steps to vent the coil after installing
the unitꢀ See Figure 16ꢀ
1ꢀ Pressurize the building piping system with water and vent any
trapped air at system ventsꢀ
2ꢀ For units with manual air vents, back the set screw out to expel air
from the unit and then re-tighten the set screwꢀ
The automatic air vent should require no adjustment for the coil to
ventꢀ However, if the coil does not vent immediately, unscrew the outer
portion of the fitting to expel air from the portꢀ
If debris has become trapped in the vent, completely remove the outer
portion of the fitting and cleanꢀ
Figure 16. The hydronic coil air vent is above the coil
connections. A horizontal unit is on the left and a vertical on
the right.
28
UNT-IOM-6
The manual circuit setter valve is an optional end valve supplied on
the return pipe of the factory piping packageꢀ The valve allows the
operator to regulate water flow through the hydronic coil, balance the
water flow through the unit with other units in the piping system, and
serves as a shutoff or end valveꢀ See Figure 17ꢀ
Balancing The Manual
Circuit Setter Valve
Follow the procedure below to set maximum water flow through the
coilꢀ
1ꢀ Establish water flow through the coilꢀ Perform an open override of
the valve if the control valve is closed to the coil, either manually or
by Tracer®ꢀ
If the piping package has 2-position, normally closed valves:
Drive open the valve using a 24V signalꢀ
If the piping package has 2-
position, normally open
valves:
Manually drive open the valve by
removing power to the valveꢀ
If the piping package has
modulating valves:
To manually drive the valve open,
depress the button stem on top
of the valve and push the lever
located on the side of the valve to
the full open positionꢀ
Figure 17. Manual circuit setter
valve.
2ꢀ For presetting, use the appropriate valve curve shown in Figure 19
on page 30 to determine which setting is necessary to achieve the
appropriate pressure dropꢀ
3ꢀ Carefully remove the Schrader pressure port connection caps on
the manual circuit setter, since they will be at the same temperature
as the pipelineꢀ
4ꢀ Bleed all air from the hoses and meter before reading the pressure
dropꢀ Refer to the gauge operating instructionsꢀ
5ꢀ Adjust the circuit setter valve by turning the valve stem until the
appropriate pressure drop is achievedꢀ See Figure 18 on page 30ꢀ
6ꢀ After achieving the proper setting, slightly loosen the two socket
head cap screws and rotate the memory stop around until it
touches the back side of the indicatorꢀ Then tighten the screws to
UNT-IOM-6
29
securely set the open memory positionꢀ The memory stop indicates
the last set open positionꢀ
7ꢀ If using a 3-way valve: close the control valve to the coil, with the
differential pressure meter still
connectedꢀ This will divert flow to
the bypass side of a 3-way valveꢀ
Adjust the balancing fitting to
obtain the same pressure drop
across the circuit setter valve as
in step 2 when the control valve
was open to the coilꢀ
Figure 18. Close-up view of
manual circuit setter valve.
Figure 19. Setting the manual circuit setter valve, differential
pressure vs. flow.
30
UNT-IOM-6
The automatic flow valve is an
optional end valve on the return of
the factory piping packageꢀ
See Figure 20ꢀ The valve regu-
lates water flow through the coil
to a specific (gpm) flow rate, as
ordered by the customerꢀ
Balancing The Auto-
matic Circuit Setter
Valve
The automatic flow valve controls
to the specified flow rate, pro-
vided that the pressure drop
across the valve is within a
Figure 20. Automatic circuit
setter valve.
certain rangeꢀ To verify that the
valve is operating properly, remove the protective caps from the P/T
ports and measure the pressure drop across the valve with a differen-
tial pressure meterꢀ Carefully remove the P/T port connection caps,
since they will be at the same temperature as the pipelineꢀ The
reading should be within the given ranges in Table 2ꢀ If the pressure
drop is not within the ranges listed, the valve will not control water
flowꢀ If the valve orifice becomes clogged with debris, remove water
from piping and then remove the cap of the valve body and push on
the piston to dislodge any foreign matterꢀ If this is not successful,
remove the cartridge and cleanꢀ
Table 2ꢀ Automatic Circuit Setter Flow Rate Rangeꢀ
Valve gpm
0ꢀ5 to 8ꢀ0
9 to 12
Pressure Drop Range (psig)
2 to 32
5 to 50
Replace the cartridge in the field without breaking the piping line to
furnish a higher or lower gpmꢀ To do this, remove the water from the
systemꢀ Remove the cap assembly containing the plug from the valve
bodyꢀ Grasp the cartridge by the piston to removeꢀ Install a different
spring if the pressure drop range of the valve is being changed alsoꢀ
UNT-IOM-6
31
Duct Connections
The unit’s airflow configuration varies dependent on the model and
options orderedꢀ A one-inch duct collar is provided on units with a
ducted return and/or discharge to attach ductwork to the unitꢀ
The Trane Company recommends using galvanized sheet metal
ductwork with fan-coil and cabinet heater unitsꢀ Slide the sheetmetal
duct over the duct collar flange of the unit, seal the joint and fasten
with sheetmetal screwsꢀ
Note: Do not run screws through the removable front panel on con-
cealed unitsꢀ
Install all air ducts according to National Fire Protection Association
standards for the Installation of Air Conditioning and Ventilating
Systems (NFPA 90A and 90B)ꢀ
Follow the general recommendations listed below when installing
ductwork for the unitꢀ
Ductwork
Recommendations
· Discharge ductwork should run in a straight line, unchanged in size
or direction, for a minimum equivalent distance of 3 fan diameters
from the unit (approximately 20 inches)ꢀ
· When making duct turns and transitions avoid sharp turns and use
proportional splits, turning vanes, and air scoops when necessaryꢀ
· When possible, construct, and orient supply ductwork turns in the
same direction as the fan rotationꢀ
32
UNT-IOM-6
Electrical Connections
Refer to the unit nameplate to obtain the minimum circuit ampacity
(MCA) and maximum fuse size (MFS) or maximum circuit breaker
(MCB) to properly size field supply wiring and fuses or circuit break-
ersꢀ See Figure 2 on page 6 to reference the nameplate locationꢀ
Refer to the unit operating voltage listed on the unit wiring schematic,
submittal, or nameplateꢀ Reference the wiring schematic for specific
wiring connectionsꢀ
Supply Power
Wiring
!
WARNING: Hazardous voltage! Disconnect all
electric power including remote disconnects before
servicing. Failure to do so may cause severe personal
injury or death.
Wiring diagrams are attached to the unit in a plastic bag and can be
be easily removed for referenceꢀ Wiring schematics are attached as
follows:
· Vertical cabinet & recessed units:
Schematics are on the inside of the front panelꢀ See Figure 21ꢀ
· Vertical concealed & all horizontal units:
Locate schematics on the fan and motor panel of unitꢀ See Figure 22ꢀ
CAUTION: Use copper conductors only! Unit
!
terminals are not designed to accept other types of
conductors. Failure to do so may cause damage to the
equipment.
Figure 21. Locate the wiring
schematic on the inside of the
front panel of vertical cabinet
and recessed units.
Figure 22. Locate the wiring
schematic on the fan and
motor panel of vertical
concealed and all horizontal
units. (This unit is turned on
it's side.)
UNT-IOM-6
33
All field wiring should conform
to NEC and all applicable
state and local code require-
mentsꢀ
The control panel box is
always on the end opposite
the piping connectionsꢀ
Access the control box by
removing the two screws that
secure the front coverꢀ If the
unit has a terminal unit control
board (TUC), remove the screw
in the top right corner of the
panelꢀ This will allow the panel
to pivot downward to provide
access to the electrical
Figure 23. The terminal unit
control (TUC) board pivots
downward to provide service
access.
componentsꢀ See Figure 23ꢀ
WARNING: Insulate all power wire from sheetmetal
ground. Failure to do so may cause electrical shorts
resulting in personal injury or death.
!
Units have one of three different connection points, depending on the
unit type and optionsꢀ
1ꢀ Power & ground inside of control box:
If the unit has a fan mode switch, Tracer® ZNꢀ010 or ZNꢀ510 control
without a disconnect switch, the power leads and capped ground
wire are inside the control panelꢀ
2ꢀ Power & ground inside the junction box:
If the unit has a TUC control without a disconnect switch, the power
leads and capped ground wire are inside the junction box on the
control panelꢀ
3ꢀ Power wired to switch on junction box & ground inside of junction
box:
If the unit has a disconnect switch, the power leads wire to the
junction box switch on the control panelꢀ Pull the capped
ground wire into the junction boxꢀ
34
UNT-IOM-6
All sensor and input circuits are normally at or near ground (common)
potentialꢀ When wiring sensors and other input devices to the Tracer®
ZNꢀ010, ZNꢀ510, ZNꢀ520 or TUC, avoid creating ground loops with
grounded conductors external to the unit control circuitꢀ Ground loops
can affect the measurement accuracy of the controllerꢀ
Electrical
Grounding
Restrictions
CAUTION: Unit transformer IT1 provides power to
!
fan-coil unit only. Field connections to the transformer
IT1 may create immediate or premature unit component
failure.
All input/output circuits (except isolated relay contacts and optically
isolated inputs) assume a grounded source, either a ground wire at
the supply transformer to control panel chassis, or an installer
supplied groundꢀ
Note: Do not connect any sensor or input circuit to an external ground
connectionꢀ
The installer must provide interconnection wiring to connect wall
mounted devices such as a fan mode switch or zone sensor moduleꢀ
Refer to the unit wiring schematic for specific wiring details and point-
to-point wiring connectionsꢀ Dashed lines indicate field wiring on the
unit wiring schematicsꢀ All interconnection wiring must conform to
NEC Class 2 wiring requirements and any state and local require-
mentsꢀ Refer to Table 3 for the wire size range and maximum wiring
distance for each deviceꢀ
Wall Mounted
Control
Interconnection
Wiring
Recommendation: Do not bundle or run interconnection wiring
in parallel with or in the same conduit with any high-voltage
wires (110V or greater)# Exposure of interconnection wiring to
high voltage wiring, inductive loads, or RF transmitters may
cause radio frequency interference (RFI)# In addition, improper
separation may cause electrical noise problems# Therefore, use
shielded wire (Beldon 83559/83562 or equivalent) in applications
that require a high degree of noise immunity# Connect the shield
to the chassis ground and tape at the other end#
Table 3ꢀ Maximum Wiring Distances, ft (m)
Device
Wire Size Range
Maxꢀ Wiring Distance
Fan Mode Switch
14 - 22 AWG
500 (152ꢀ4)
Zone Sensor Module
200 (60ꢀ96)
16 - 22 AWG
UNT-IOM-6
35
Installing Wall Mounted Controls
Wall mounted controls, which include the fan mode switch and the
zone sensor module, ship loose inside the unit accessory bagꢀ
Position the controller on an inside wall 3 to 5 feet above the floor and
and at least 18 inches from the nearest outside wallꢀ Installing the
controller at a lower height may give the advantage of monitoring the
temperature closer to the zone, but it also exposes the controller to
airflow obstructionsꢀ Ensure that air flows freely over the controllerꢀ
Avoid mounting the controller in an area subject to the following
conditions:
· Dead spots such as behind doors or in corners that do not allow
free air circulationꢀ
· Air drafts from stairwells, outside doors, or unsectioned hollow
wallsꢀ
· Radiant heat from the sun, fireplaces, appliances, etcꢀ
· Airflow from adjacent zones or other unitsꢀ
· Unheated or uncooled spaces behind the control, such as outside
walls or unoccupied spacesꢀ
· Concealed pipes, air ducts, or chimneys in partition spaces behind
the controllerꢀ
The fan mode switch ships loose inside the unit accessory bagꢀ
Follow the steps below to install the fan mode switchꢀ
Fan Mode Switch
Installation
Items needed:
2 x 4 electrical junction box
1ꢀRemove the brown wire if not using a field-supplied damperꢀ
Remove the terminals, cut and strip wires as required for installationꢀ
2ꢀLevel and position a 2 x 4 electrical junction boxꢀ Follow the
instructions given in the “Interconnection Wiring” section and route the
wires as shown in the wiring diagramꢀ Refer to the typical wiring
diagram on page 101 or to the unit specific diagram on the unitꢀ
3ꢀPosition the fan mode switch over the junction box with the two
screws suppliedꢀ
Figure 24. Fan Mode Switch
36
UNT-IOM-6
Follow the procedure below to install the zone sensor moduleꢀ
Reference Figure 25 on page 38 when installing the wall mounted
zone sensorꢀ
Zone Sensor
Installation
1ꢀ Note the position of the setpoint adjustment knob and gently pry
the adjustment knob from the cover using the blade of a small
screwdriverꢀ
2ꢀ Insert the screwdriver blade behind the cover at the top of the
module and carefully pry the cover away from the baseꢀ
3ꢀ To install the zone sensor module without a junction box
(directly to the wall):
aꢀ Using the module base as a template, mark the the rectangular
cutout for the control wiring and module installation holesꢀ Ensure
the base is levelꢀ
bꢀ Set the base aside and make the cutoutꢀ Then, drill two 3/16
inch diameter holes approximately 1 inch deepꢀ Insert and fully
seat the plastic anchorsꢀ
cꢀ Pull the control wires through the cutout and attach the module
to the wall using the screws providedꢀ
4ꢀ To install the zone sensor module to a standard junction box:
aꢀ Level and install a 2 inch x 4 inch junction box (installer
supplied) vertically on the wallꢀ
bꢀ Pull the control wires through the cutoutꢀ Attach the module to
the wall using the screws providedꢀ
5ꢀ Strip the insulation on the interconnection wires back 0ꢀ25 inch
and connect to TB1ꢀ Screw down the terminal blocksꢀ
6ꢀ Replace the zone sensor cover and adjustment knobꢀ
Before beginning installation, follow the wiring instructions in the “Wall
Mounted Control Interconnection Wiring” section on page 34ꢀ Also,
refer to the unit wiring schematic for specific wiring details and point
connectionsꢀ
If installing a TUC zone sensor, see the TUC sections regarding
communication wiring beginning on page 60 for more detailed informa-
tionꢀ
UNT-IOM-6
37
Wall mounted zone sensor
Model # Digit 31 = W
Split-mounted option:
Wall mounted setpoint dial with unit
mounted fan mode switch
Model # Digit 31 = X
Figure 25. Wall mounted zone sensor dimensions.
Figure 26. Resistance temperature curve for the zone sensor, entering water temperature sensor,
and discharge air sensor.
38
UNT-IOM-6
Fan Mode Switch
Manual Fan Mode Switch
The manual fan mode switch is available for fan-coil units that do not
have Trane factory-mounted control packagesꢀ This four-position
switch (off-hi-med-lo) allows manual fan mode selection and is
available unit or wall mountedꢀ
The unit-mounted option (Digit 31 = D) operates on line voltageꢀ The
wall-mounted option (Digit 31 = K) is low-voltage and has three 24 volt
relays using a factory-wired transformer and relays to control the fan
motorꢀ
Sequence of Operations
Off: Fan is turned off, two-position damper option spring-returns
closedꢀ
Hi, Med, Lo: Fan runs continuously at the selected speedꢀ The two-
position damper option opens to an adjustable mechanical stop-
positionꢀ
UNT-IOM-6
39
®
Tracer ZN.010
and ZN.510
Tracer® ZN.010 and ZN.510
The Tracer® ZNꢀ010
is a stand-alone
device that controls
fan-coils and cabinet
heatersꢀ The Tracer®
ZNꢀ510 can be
stand-alone or utilize
peer-to-peer commu-
nicationsꢀ The
controller is easily
accessible in the
control end panel for
serviceꢀ The control
end panel is on the
end of the unit
Figure 27. The Tracer ZN.010 board.
opposite the pipingꢀ
Reference Figure 27ꢀ
Sequence of Operations
Off: Fan is off; control valves and fresh air damper option closeꢀ Low
air temperature detection option is still activeꢀ
Auto (Fan Cycling): Fan and fresh air damper cycle with control
valve option to maintain setpoint temperatureꢀ In cooling mode, the
fan cycles from off to medium and in heating mode it cycles from off
to lowꢀ When no heating or cooling is required, the fan is off and the
fresh air damper option closesꢀ
Low/Med/High (Continuous Fan): Fan operates continuously while
control valve option cycles to maintain setpoint temperatureꢀ Fresh
air damper option is openꢀ
40
UNT-IOM-6
®
Tracer ZN.010
and ZN.510
When 24 VAC power is initially applied to the Tracer® ZNꢀ010 or
ZNꢀ510, the following sequence occurs:
1ꢀ All outputs are controlled offꢀ
2ꢀ Tracer® ZNꢀ010 and ZNꢀ510 reads all input values to detemine
initial valuesꢀ
Operating
Information
Power-Up Sequence
3ꢀ The random start time (0-25 seconds) expiresꢀ
4ꢀ Normal operation beginsꢀ
Both Tracer® ZNꢀ010 and ZNꢀ510 use an entering water temperature
sampling function to test for the correct water temperature for the unit
operating modeꢀ For all applications not involving changeover, the
water temperature does not effect the unit operationꢀ
Entering Water
Temperature
Sampling Function
The entering water temperature sampling function opens the main
hydronic valve, waits no more than three minutes to allow the water
temperature to stabilize, then measures the entering water tempera-
ture to see if the correct water temperature is availableꢀ
The entering water must be five degrees or more above the space
temperature to allow hydronic heating and five degrees or more below
the space temperature to allow hydronic coolingꢀ
If the correct water temperature is available, the unit begins normal
heating or cooling operationꢀ If the measured entering water tempera-
ture is too low or high, the controller closes the valve and waits 60
minutes before attempting to sample the entering waterꢀ Reference
Table 4ꢀ
Table 4ꢀ Unit Mode as Related to Water Temperature
Unit Type
EWT Sensor Required?
Coil Water Temperature
· Can cool if:
space temp - EWT ³ 5 deg F
· Can heat if:
2-pipe changeover
Yes
EWT - space temp ³ 5 deg F
· Can cool if:
4-pipe changeover
Yes
space temp - EWT ³ 5 deg F
· Can heat if:
EWT - space temp ³ 5 deg F
2-pipe heating only
2-pipe cooling only
4-pipe heat/cool
No
No
No
Hot water assumed
Cold water assumed
·Cold water assumed in main coil
·Hot water assumed in auxꢀ coil
UNT-IOM-6
41
®
Tracer ZN.010
and ZN.510
Binary Inputs
The factory hard wires the low temperature detection sensor to binary
input #1 (BIP1) on the Tracer® ZNꢀ010 and ZNꢀ510ꢀ The sensor
defaults normally closed (NꢀCꢀ), and will trip off the unit on a low
temperature diagnostic when detecting low temperatureꢀ In addition,
the Tracer® ZNꢀ010 and ZNꢀ510 control unit devices as listed below:
BIP1: Low
Temperature
Detection
Option
Fan:
Off
Valves:
Open
Electric heat: Off
Damper:
Closed
Note: See the “Diagnostics” section on page 50 for more informationꢀ
BIP2: Condensate
Overflow Detection
Option
The factory hard wires the condensate overflow sensor to binary input
#2 (BIP2) on the Tracer® ZNꢀ010 and ZNꢀ510ꢀ The sensor defaults
normally closed (NꢀCꢀ), and will trip off the unit on a condensate
overflow diagnostic if condensate reaches the trip pointꢀ In addition,
the Tracer® ZNꢀ010 and ZNꢀ510 control unit devices as listed below:
Fan:
Off
Valves:
Closed
Electric heat: Of
Reference Table 6 for the Tracer® ZNꢀ010 and ZNꢀ510’s six binary
outputsꢀ
Binary input #3 (BIP3) on Tracer® ZNꢀ010 and ZNꢀ510 is available for
field- wiring an occupancy sensor, such as a binary switch or a
timeclock, to detect occupancyꢀ The sensor can be either normally
open or normally closedꢀ Reference Table 5 on page 43ꢀ
BIP3: Occupancy
Sensor
42
UNT-IOM-6
®
Tracer ZN.010
and ZN.510
Table 5ꢀ Occupancy Sensor State Table
Sensor Type
Sensor Position
Unit Occupancy Mode
Normally Open
Normally Open
Normally Closed
Normally Closed
Open
Closed
Open
Occupied
Unoccupied
Unoccupied
Occupied
Closed
Binary Outputs
Table 6ꢀ Binary Outputs
Binary Output
BOP1
BOP2
BOP3
BOP4
Description
Fan high speed
Fan medium speed
Fan low speed
Main valve
Pin
J1-1
J1-2
J1-4
J1-5
J1-6
J1-7
BOP5
BOP6
Auxiliary valve/electric heat
2-position fresh air damper
Notes:
1ꢀ In a four-pipe application, BOP4 is used for cooling and BOP5 is
used for heatingꢀ
2ꢀ If no valves are ordered with the unit, the factory default for the
Tracer® ZNꢀ010 and ZNꢀ510 controller are:
BOP4 configured as normally closed
BOP5 configured as normally open
3ꢀ If the fresh air damper option is not ordered on the unit, BOP6 will
be configured as noneꢀ
UNT-IOM-6
43
®
Tracer ZN.010
and ZN.510
Both Tracer® ZNꢀ010 and ZNꢀ510 accept a maximum of five analog
inputsꢀ Reference Table 7ꢀ
Analog Inputs
Table 7ꢀ Analog Inputs Available
Analog Input
Description
Application
Zone
Space temperature
Local setpoint
Space temperature detection
Set
Thumbwheel setpoint
Zone sensor fan switch
Fan
Fan mode input
Analog input 1 (AI1)
Analog input 2 (AI2)
Entering water temperature
Discharge air temperature
Entering water temperature detection
Discharge air temperature detection
Notes:
1ꢀThe zone sensor, entering water temperature sensor, and the discharge air temperature sensor are
10KW thermistorsꢀ Figure 26 on page 38 provides the resistance-temperature curve for these
thermistorsꢀ
2ꢀ Zone Sensor:
Wall mounted sensors include a thermistor soldered to the sensor’s circuit board
Unit mounted sensors include a return air sensor in the unit’s return air streamꢀ
3ꢀ Changeover units include an entering water temperature sensorꢀ
Zone Sensors
The zone sensors available with the Tracer® ZNꢀ010 and ZNꢀ510
provide up to three different inputs
1ꢀ Space temperature measurement (10K thermistor)
2ꢀ Local setpoint
3ꢀ Fan mode switch
Wall mounted zone sensors include a thermistor as a component of
the internal printed circuit boardꢀ Unit mounted zone sensors use a
sensor placed in the unit’s return air streamꢀ
Each zone sensor is equipped with a thumbwheel for setpoint
adjustmentꢀ
Fan Mode Switch
The zone sensor may be equipped with a fan mode switchꢀ The fan
mode switch offers selections of off, low, medium, high, or autoꢀ
Reference Table 8 on page 45 for fan mode operationꢀ
44
UNT-IOM-6
®
Tracer ZN.010
and ZN.510
The Tracer® ZNꢀ010 and ZNꢀ510 will operate in either continuous fan
or fan cycling modeꢀ The fan cycles when the fan mode switch is
placed in autoꢀ The fan runs continuous when placed in the high,
medium, or low positionꢀ Use Rover™, installation and service tool,
to change the auto defaultsꢀ
Supply Fan
Operation
Table 8ꢀ Fan Mode Operation
Heating Mode
Cooling Mode
Fan Mode
Occupied
Unoccupied
Occupied
Unoccupied
Off
Off
Off
Off
Off
Low
Low
Off/high (3)
Off/high (3)
Off/high (3)
Low
Off/high (3)
Off/high (3)
Off/high (3)
Medium
High
Medium
High
Medium
High
Auto
Continuous
Heat default
Off/high (3)
Off/high (3)
Cool default
Off/high (3)
Off/high (3)
CyclingOff/heat default
Off/cool default
Notes:
1ꢀ During the transition from off to any fan speed but high, Tracer® ZNꢀ010 and ZNꢀ510 automatically
starts the fan on high speed and runs for three seconds before transitioning to the selected speed (if it
is other than high)ꢀ This provides enough torque to start all fan motors from the off positionꢀ
2ꢀ When the heating output is controlled off, ZNꢀ010 and ZNꢀ510 automatically controls the fan on for
an additional 30 secondsꢀ This delay allows the fan to dissipate any residual heat from the heating source,
such as electric heatꢀ
3ꢀ Whenever two states are listed for the fan:
The first state (off) applies when there is not a call for heating or coolingꢀ
The second state (varies) applies when there is a call for heating or coolingꢀ
The heat default is factory configured for low fan speed, and the cool default is mediumꢀ
Table 9ꢀ Valid Operating Range and Factory Default Setpoints
Setpoint/Parameter
Default Setting
Valid Operating Range
Unoccupied cooling setpoint
85° F
40 to 115° F
Occupied cooling setpoint
Occupied Heating setpoint
Unoccupied heating setpoint
Cooling setpoint high limit
Cooling setpoint low limit
Heating setpoint high limit
Heating setpoint low limit
74° F
71° F
60° F
110° F
40° F
105° F
40 to 115° F
40 to 115° F
40 to 115° F
40 to 115° F
40 to 115° F
40 to 115° F
40° F
40 to 115° F
Power up control wait
UNT-IOM-6
0 sec
0 to 240 sec
45
®
Tracer ZN.010
and ZN.510
Troubleshooting
Green STATUS LED
Yellow COMM LED
Red SERVICE LED
Figure 28. The Tracer ZN.010 board.
LED Activity
Red Service LED
Table 10ꢀ Red Service LED Activity
Red LED Blink Activity
Description
LED off continuously when power
is applied to the controller
Normal operation
LED on continuously, even when
power is applied to the controller
Someone is pressing the service button or the controller has failedꢀ
LED flashes once every second
Use Rover™, Trane’s service tool, to restore the unit to normal
operationꢀ Refer to the Rover™ product literature for more informationꢀ
46
UNT-IOM-6
®
Tracer ZN.010
and ZN.510
The green LED normally indicates whether the controller is powered
on (24 VAC supplied)ꢀ Reference Table 11ꢀ
Green STATUS LED
Table 11ꢀ Green STATUS LED Activity
Green LED Blink Activity
Description
LED on continuously
Power on (normal operation)
LED blinks once
LED blinks twice
Manual output test mode
Manual output test mode, with one or more diagnos-
tic present
LED blinks (1/4 second on, 1/4 second
off for 10 seconds)
“Wink” mode
LED off
· Power off
· Abnormal condition
· Test button is pressed
Note: The “wink” feature allows the identification of a particular controllerꢀ When sending a request from a
device, such as Rover™, the controller will “wink” to indicate it received the signalꢀ
Yellow COMM LED
Table 12ꢀ Yellow COMM LED Activity
Yellow LED Blink Activity
Description
LED off continuously
The controller is not detecting any communicationꢀ
(Normal for units in standalone applications)
LED blinks
The controller detects communicationꢀ
Abnormal condition
LED on continuously
UNT-IOM-6
47
®
Tracer ZN.010
and ZN.510
The purpose of the manual output test sequence is to verify output
and end device operationꢀ Use the manual output test to:
· Verify output wiring and operation without using Rover™,
service toolꢀ
Manual Output
Test
· Force the water valve to open and balance the hydronic systemꢀ
Note: The manual output test is not an automatic cycleꢀ You must
press the Test button to proceed through each stepꢀ
The controller observes all diagnostics that occur during the test
sequenceꢀ Although an automatic diagnostic reset sequence exists
as part of the controller’s normal operation, the automatic diagnostic
reset feature is not active during the test sequenceꢀ
If left in an individual test step, the controller remains in test mode
for 60 minutes and then exits to normal operationꢀ
Many service calls are due to unit diagnosticsꢀ The test sequence
resets unit diagnostics and attempts to restore normal unit operation
prior to testing the outputsꢀ If the diagnostics remain after a reset, the
STATUS LED indicates the diagnostic condition is still present (two
blinks)ꢀ See the Green STATUS LED section in Table 11 on page 47ꢀ
Follow the procedure below to test the Tracer® ZNꢀ010 and ZNꢀ510
controllerꢀ
Manual Output Test
Procedure
1ꢀ Press and hold the Test button for at least two seconds (not
exceeding 5 seconds), and then release, to start the test modeꢀ
2ꢀ The test sequence will turn off all outputs and then attempt to clear
all diagnosticsꢀ
3ꢀ Press the Test button several more times (no more than once per
second) to advance through the test sequenceꢀ
The outputs are not subject to minimum times during the test se-
quenceꢀ However, the test sequence only permits one step per
second which limits minimum output timeꢀ
The green LED is turned off when the Test button is pressedꢀ To begin
the manual output test mode, press and hold the Test button (turning
off the green LED) for at least two secondsꢀThe green LED will begin
to blink, indicating the controller is in test modeꢀ
48
UNT-IOM-6
®
Tracer ZN.010
and ZN.510
Table 13ꢀ Test Sequence for 1-Heat /1-Cool Configurations
Steps
Fan
BOP1-3
Off
Cool Output
BOP4 (1)
Off
Heat Output
BOP5BOP6
Off
Damper
Closed
Closed
Closed
Closed
Closed
Closed
Open
1ꢀ Off
2ꢀ Fan High
3ꢀ Fan Medium
4ꢀ Fan Low
5ꢀ Cool
High
Off
Off
Off
On
Off
Off
Off
Off
Off
Off
On
Off
Medium
Low
High
High
High
6ꢀ Heat
7ꢀ Fresh Air
Damper (3)
8ꢀ Exit
(2)
Notes:
(1) At the beginning of step 2, the controller attempts to clear all diagnosticsꢀ
(2) For all 1-heat/1-cool applications including 2-pipe changeover, BOP4 energizes in the cooling test
stage and BOP5 energizes in the heat test stageꢀThis occurs even though during normal 2-pipe
changeover operation BOP4 controls the unit valve for both cooling and heatingꢀ
(2) After the Fresh Air Damper step, the test sequence performs the Exit stepꢀThis initiates a reset and
attempts to return the controller to normal operationꢀ
(3) The fresh air damper (BOP6) only energizes during this step if binary output 6 has been configured as
a fresh air damperꢀ
UNT-IOM-6
49
®
Tracer ZN.010
and ZN.510
Diagnostics
Table 14ꢀ Controller Diagnostics
Diagnostic
Latching
Yes/No
Fan
Valves
Electꢀ Heat
Damper
Auxiliary
tempꢀ failure
No
Enabled
Off
No action
No action
Off
No action
Condensate
overflow
Yes
Closed
Closed
detection
Entering
water tempꢀ
failure
No
Enabled
Enabled
Enabled
Enabled
Fan mode
failure
No
Enabled
Disabled
Enabled
Disabled
Enabled
Disabled
Enabled
Disabled
Invalid unit
configuration
failure
Yes
Low tempꢀ
detection
Yes
Off
Open
Off
Closed
Maintenance Yes
required
Enabled
No action
No action
No action
Setpoint
No
No
Enabled
Off
No action
Closed
No action
Off
No action
Closed
Zone tempꢀ
failure
Notes:
Priority Level: Diagnostics are listed in order from highest to lowest priorityꢀ The controller senses and
records each diagnostic independently of other diagnosticsꢀ It is possible to have multiple diagnostics
present simultaneouslyꢀ The diagnostics affect unit operation according to priority levelꢀ
Latching: A latching diagnostic requires a manual reset of the controller; while a non-latching diagnostic
automatically resets when the input is present and validꢀ
Enabled: End device is allowed to run if there is a call for it to runꢀ
Disabled: End device is not allowed to run even if there is a call for it to runꢀ
No Action: The diagnostic has no affect on the end deviceꢀ
50
UNT-IOM-6
®
Tracer ZN.010
and ZN.510
There are four ways in which diagnostics are reset:
Resetting
Diagnostics
1ꢀ Automatic reset by the controller
2ꢀ By initiating a manual output test at the controller
3ꢀ By cycling power to the controller
4ꢀ Through Rover™, Trane’s service tool
The controller includes an automatic diagnostic reset function which
attempts to automatically restore the unit when a low temperature
diagnostic occursꢀ
Automatic Reset by
the Controller
Note: The controller implements the automatic diagnostic reset
function only once every 24 hoursꢀ For the controller to increment the
24 hour timer, you must maintain power to the controllerꢀ Cycling
power resets all timers and countersꢀ
After the controller detects the first special diagnostic, the unit waits
30 minutes before invoking the automatic diagnostic reset functionꢀ
The automatic diagnostic reset function clears the special diagnostic
and attempts to restore the controller to normal operationꢀ The
controller resumes normal operation until another diagnostic occursꢀ
Note: The automatic diagnostic reset function does not operate during
the manual output test sequenceꢀ
If a special diagnostic occurs within 24 hours after an automatic
diagnostic reset, the controller must be manually resetꢀ Other pos-
sible methods of resetting diagnostics are described in the sections
that followꢀ
Use the controller’s Test button during installation or for troubleshoot-
ing to verify proper end device operationꢀ Press the Test button to
exercise all outputs in a predefined sequence, the first of which will
attempt to reset the controller diagnostics if any are presentꢀ See
Table 13 on page 49 for more information about the manual output
testꢀ
Manual Output Test
After removing and reapplying the 24 VAC power from the board, the
unit cycles through a power-up sequenceꢀ By default, the controller
attempts to reset all diagnostics at power-upꢀ Diagnostics present at
power-up and those that occur after power-up are handled according
to Table 14 on page 50ꢀ
Cycling Power to the
Controller
UNT-IOM-6
51
®
Tracer ZN.010
and ZN.510
Rover™, Trane’s service tool, can reset diagnostics present in the
controllerꢀ For complete information about Rover™, refer to Trane
publication EMTX-IOP-2 Rover Installation, Operation and Program-
ming Guideꢀ
Trane’s Service Tool,
Rover™
Alarm Reset
Any device that can communicate alarm reset information can reset
diagnostics present in the controllerꢀ
52
UNT-IOM-6
®
Tracer ZN.010
and ZN.510
Troubleshooting
Table 15ꢀ Fan Outputs do not Energize
Probable Cause
Explanation
Random start
observed
After power-up, the controller always observes a random start that varies
between 0 and 25 secondsꢀ The controller remains off until the random start
time expiresꢀ
Power-up control wait
When power-up control wait is enabled (non-zero time), the controller remains
off until one of two conditions occurs:
1ꢀ The controller exits power-up control wait once it receives communicated
informationꢀ
2ꢀ The controller exits power-up control wait once the power-up control wait
time expiresꢀ
Cycling fan operation
Unoccupied operation
When the fan mode switch is in the auto postion, the unit fan cycles off when
there is no call for heating or coolingꢀ The heating/cooling sources cycle on or
off periodically with the unit fan to match the capacity according to pulse-width-
modulation (PWM) logicꢀ
The fan cycles with capacity when the unit is in unoccupied modeꢀ This occurs
even if the unit is in continuous fan operationꢀ While unoccupied, the fan cycles
on or off with heating/cooling to provide varying amounts of heating or cooling to
the spaceꢀ to match the capacity according to pulse-width-modulation
(PWM) logicꢀ
Fan mode off
When using the local fan mode switch to determine the fan operation, the off
position controls the unit fan to offꢀ
Requested mode: off
It is possible to communicate the operating mode (such as off, heat, and
cool) to the controllerꢀ When “off” is communicated to the controller, the unit
controls the fan to offꢀ The unit is not capable of heating or cooling when the
controller is in this modeꢀ
Diagnostic present
A specific list of diagnostics effects fan operationꢀ For more information, see the
“Diagnostics” section on page 50ꢀ
No power to the
controller
If the controller does not have power, the unit fan will not operateꢀ For the
controller to operate normally, it must have an input voltage of 24 VACꢀ When
the green LED is off continuously, the controller does not have sufficient power
or the controller has failedꢀ
Manual output test
Unit wiring
The controller includes a manual output test sequence to verify binary output
operation and the associated wiringꢀ However, based on the current step in the
test sequence, the unit fan may not be powered onꢀ Refer to the “Manual
Output Test” section on page 51ꢀ
The wiring between the controller outputs and the fan relays and contacts must
be present and correct for normal fan operationꢀ Refer to the typical unit wiring
diagrams in the Appendix of this manualꢀ
UNT-IOM-6
53
®
Tracer ZN.010
and ZN.510
Table 16ꢀ Valves Stay Closed
Probable Cause
Explanation
Normal operation
The controller opens and closes the valves to meet the unit capacity require-
mentsꢀ
Requested mode: off
It is possible to communicate the operating mode (such as off, heat, and
cool) to the controllerꢀ When off is communicated to the controller, the unit
controls the fan to offꢀ The unit is not capable of heating or cooling when the
controller is in this modeꢀ
Valve override
The controller can communicate a valve override requestꢀ This request effects
the valve operationꢀ
Manual output test
The controller includes a manual output test sequence to verify analog and
binary output operation and the associated wiringꢀ However, based on the
current step in the test sequence, the valves may not be openꢀ Refer to the
“Manual Output Test” section on page 51ꢀ
Diagnostic present
Sampling logic
A specific list of diagnostics affects valve operationꢀ For more information, see
the “Diagnostics” section on page 50ꢀ
The controller includes entering water temperature sampling logic that
automatically invokes during 2-pipe or 4-pipe changeoverꢀ It determines when
the entering water temperature is either too cool or too hot for the desired
heating or cooling modeꢀ Refer to the “Entering Water Temperature Sampling”
section on page 41ꢀ
Unit configuration
The controller must be properly configured based on the actual installed end
devices and applicationꢀ When the unit configuration does not match the actual
end device, the valves may not work correctlyꢀ
No power to the
controller
If the controller does not have power, the valves do not operateꢀ For the controller
to operate normally, it must have an input voltage of 24 VACꢀ When the green
LED is off continuously, the controller does not have sufficient power,
or the controller has failedꢀ
Unit wiring
The wiring between the controller outputs and the valve(s) must be present and
correct for normal valve operationꢀ Refer to the typical unit wiring diagrams in the
Appendix of this manualꢀ
54
UNT-IOM-6
®
Tracer ZN.010
and ZN.510
Table 17ꢀ Valves Stay Open
Probable Cause
Explanation
Normal operation
The controller opens and closes the valves to meet the unit capacity require-
mentsꢀ
Valve override
The controller can communicate a valve override request to affect the
valve operationꢀ
Manual output test
The controller includes a manual output test sequence that verifies analog and
binary output operation and the associated wiringꢀ However, based on the
current step in the test sequence, the valves may be openꢀ Refer to the “Manual
Output Test” section on page 51ꢀ
Diagnostic present
Sampling logic
A specific list of diagnostics affects valve operationꢀ For more information, see
the “Diagnostics” section on page 50ꢀ
The controller includes entering water temperature sampling logic that automati
cally invokes during 2-pipe or 4-pipe changeover to determine if the
entering water temperature is correct for the unit operating modeꢀ Refer to the
“Entering Water Temperature Sampling” section on page 41ꢀ
Unit configuration
Unit wiring
The controller must be properly configured based on the actual installed end
devices and applicationꢀ When the unit configuration does not match the actual
end device, the valves may not work correctlyꢀ
The wiring between the controller outputs and the valve(s) must be present and
correct for normal valve operationꢀ Refer to the typical unit wiring diagrams in
the Appendix of this manualꢀ
UNT-IOM-6
55
®
Tracer ZN.010
and ZN.510
Table 18ꢀ Electric Heat Not Operating
Probable Cause
Explanation
Normal operation
The controller cycles electric heat on and off to meet the unit capacity require-
mentsꢀ
Requested mode: off
It is possible to communicate the operating mode (such as off, heat, cool)
to the controllerꢀ When off is communicated to the controller, the units shuts off
the electric heatꢀ
Communicated disable Numerous communicated requests may disable electric heat, including an
auxiliary heat enable input and the heat/cool mode inputꢀ Depending on the
state of the communicated request, the unit may disable electric heatꢀ
Manual output test
The controller includes a manual output test sequence that verifies analog and
binary output operation and associated output wiringꢀ However, based on the
current step in the test sequence, the electric heat may not be onꢀ Refer to the
“Manual Output Test” section on page 51ꢀ
Diagnostic present
Unit configuration
A specific list of diagnostics affects electric heat operationꢀ For more informa-
tion, see the “Diagnostics” section on page 50ꢀ
The controller must be properly configured based on the actual installed end
devices and applicationꢀ When the unit configuration does not match the actual
end device, the electric heat may not work properlyꢀ
No power to the
controller
If the controller does not have power, electric heat does not operateꢀ For the
controller to operate normally, a 24VAC input voltage must be appliedꢀ When
the green LED is off continuously, the controller does not have sufficient power
or has failedꢀ
Unit Wiring
The wiring between the controller outputs and the electric heat contacts must
be present and correct for normal electric heat operationꢀ Refer to the typical
unit wiring diagrams in the Appendix of this manualꢀ
56
UNT-IOM-6
®
Tracer ZN.010
and ZN.510
Table 19ꢀ Fresh Air Damper Stays Closed
Probable Cause
Explanation
Normal operation
The controller opens and closes the fresh air damper based on the controller’s
occupancy mode and fan statusꢀ Normally, the fresh air damper is open during
occupied mode when the fan is running and closed during unoccupied modeꢀ
Warmup and cooldown The controller includes both a warmup and cooldown sequence to keep the
fresh air damper closed during the transition from unoccupied to occupiedꢀ This
is an attempt to bring the space under control as quickly as possibleꢀ
Requested mode: off
It is possible to communicate the operating mode (such as off, heat, cool)
to the controllerꢀ When off is communicated to the controller, the unit closes the
fresh air damperꢀ
Manual output test
The controller includes a manual output test sequence that verifies analog and
binary output operation and associated output wiringꢀ However, based on the
current step in the test sequence, the fresh air damper may not be openꢀ Refer
to the “Manual Output Test” section on Page 51ꢀ
Diagnostic present
Unit configuration
A specific list of diagnostics effects fresh air damper operationꢀ For more
information, see the “Diagnostics” section on page 50ꢀ
The controller must be properly configured based on the actual installed end
devices and applicationꢀ When the unit configuration does not match the actual
end device, the damper may not work correctlyꢀ
No power to the
controller
If the controller does not have power, the fresh air damper does not operateꢀ For
the controller to operate normally, a 24 VAC input voltage must be appliedꢀ
When the green LED is off continuously, the controller does not have sufficient
power or has failedꢀ
Unit wiring
The wiring between the controller outputs and the fresh air damper must be
present and correct for normal damper operationꢀ Refer to the typical unit wiring
diagrams in the Appendix of this manualꢀ
UNT-IOM-6
57
®
Tracer ZN.010
and ZN.510
Table 20ꢀ Fresh Air Damper Stays Open
Probable Cause
Explanation
Normal Operation
The controller opens and closes the fresh air damper based on the controller’s
occupancy mode and fan statusꢀ Normally, the fresh air damper is open during
occupied mode when the fan is running and closed during unoccupied modeꢀ
Manual Output Test
The controller includes a manual output test sequence that verifies analog and
binary output operation and associated wiringꢀ However, based on the current
step in the test sequence, the fresh air damper may be openꢀ Refer to the
“Manual Output Test” section on page 51ꢀ
Unit Configuration
Unit Wiring
The controller must be properly configured based on the actual installed end
devices and applicationꢀ When the unit configuration does not match the actual
end device, the damper may not work correctlyꢀ
The wiring between the controller outputs and the fresh air damper must be
present and correct for normal damper operationꢀ Refer to the typical unit wiring
diagrams in the Appendix of this manualꢀ
58
UNT-IOM-6
Tracer® ZN.520
Tracer® ZN.520
Tracer® ZNꢀ520 is a communicating or standalone deviceꢀ It is easily
accessible in the control end panel for serviceꢀ The control end panel
is on the end opposite the pipingꢀ
Sequence of Operations
OFF: Fan is off; control valve options and fresh air damper options
closeꢀ The low air temperature detection option is still activeꢀ
Auto: Fan speed control in the auto setting allows the modulating (3-
wire floating point) or 2–position control valve option and three-speed
fan to work cooperatively to meet precise capacity requirement, while
minimizing fan speed ( motor/energy/acoustics ) and valve position
(pump energy, chilled water reset )ꢀ As the capacity requirement
increases at low fan speed, the water valve opensꢀ When the low fan
speed capacity switch point is reached, the fan switches to medium
speed and the water valve repositions to maintain an equivalent
capacityꢀ The reverse sequence takes place with a decrease in
required capacityꢀ
Low/Med/High: The fan will run continuously at the selected speed
and the valve option will cycle to meet setpointꢀ
For Tracer® ZNꢀ520 controlled units that will interface with the Trane
Tracer Summit® building management system, terminate the commu-
nication wiring in the control box at the designated terminals on the
boardꢀ Reference the unit wiring diagram or submittalsꢀ
Tracer Summit®
Communication
Wiring
Ground shields at each Tracer® ZNꢀ520, taping the opposite end of
each shield to prevent any connection between the shield and anther
groundꢀ Refer to Trane publication, CNT-IOP-2 Installation, Operation
and Programming Guide, for the communication wiring diagramꢀ
Communication wire must conform to the following specification:
1)
2)
3)
Shielded twisted pair 18 AWG
Capacitance 23 (21-25 ) picofarads ( pF ) per foot
Listing/Rating – 300V 150C NEC 725-2 (b) Class 2 Type
CL2P
4)
Trane Part Noꢀ 400-20-28 or equivalent, available through
Trane BAS Buying Group Accessories catalogꢀ
UNT-IOM-6
59
Tracer® ZN.520
Follow these general guidelines when installing communication
wiring:
1)
2)
Maintain a maximum 5000 ftꢀ aggregate run
Install all communication wiring in accordance with the NEC
and all local codesꢀ
3)
Solder the conductors and insulate (tape) the joint sufficiently
when splicing communication wireꢀ Do not use wire nuts to
make the spliceꢀ
4)
5)
Do not pass communication wiring between buildings be
cause the unit will assume different ground potentialsꢀ
Do not run power in the same conduit or wire bundle with
communication link wiringꢀ
Service
Communication
Wiring
Establish service communication using Rover™ service software
connected to the Tracer® ZNꢀ520 using a twisted wire pair to one of
the following connection pointsꢀ
1)
2)
Remote zone sensor module
Connections on the board
This allows the technician to view and edit the Tracer® ZNꢀ520
configuration and troubleshoot the unitꢀ However, control options
ordered and the wiring practice followed in the field may limit the
communication abilityꢀ
Wall Mounted Zone
Sensor Module
Route interconnecting wiring from the Tracer® ZNꢀ520 to provide
service communication at the wall-mounted zone sensor moduleꢀ
Install wiring by referencing the unit wiring diagram and Table 3 on
page 35 for appropriate wire sizesꢀ After wiring is complete, connect
the communication cable (provided with the Rover service tool) to the
telephone style RJ11 connection on the zone sensor moduleꢀ Attach
the other end of the cable to a laptop computer running Trane Rover
software to establish communicationꢀ
Zone Sensors Without
Interconnecting Wiring
Establish service communication to the Tracer® ZNꢀ520 by wiring
directly to the board inside the control boxꢀ Reference the unit-wiring
diagram for the appropriate communication terminals on the boardꢀ
Once wiring is complete, Use Trane Rover software to communicate
to the Tracer® ZNꢀ520ꢀ
60
UNT-IOM-6
Tracer® ZN.520
Tracer® ZNꢀ520 Unit
Start-Up
Refer to the Trane publication, CNT-IOP-2 Installation Operation and
Programming Guide, to operate the Tracer® ZNꢀ520 with Trane
Integrated Comfort™ System (ICS)ꢀ The factory pre-programs the
Tracer® ZNꢀ520 with default values to control the temperature and unit
airflowꢀ Use Tracer Summit® building automation system or Rover™
software to change the default valuesꢀ
Follow the procedure below to operate the Tracer® ZNꢀ520 in a stand-
alone operation:
1)
2)
Turn power on at the disconnect switch optionꢀ
Position the fan mode switch to either high, medium, low, or
the auto positionꢀ
3)
Rotate the setpoint dial on the zone sensor module to 55 F
for cooling or 85 F for heatingꢀ
The appropriate control valve will actuate assuming the following
conditions:
1)
Room temperature should be greater than 55 degꢀ F and less
than 85 degꢀ F
2)
For a 2-pipe fan-coil unit with an automatic changeover
sensor, the water temperature input is appropriate for the
demand placed on the unitꢀFor example, cooling operation is
requested and cold water (5 degrees lower than room tem
perature) flows into the unitꢀ
4)
Select the correct temperature setpointꢀ
Note: Select and enable zone sensor temperature settings to prevent
freeze damage to unitꢀ
Tracer®
Communications
Tracer® ZNꢀ520 is a Comm 5 controllerꢀ There is no need to set an
addressꢀ Each individual board has its own unique Neuron IꢀDꢀ
number that takes the place of dip switchesꢀ
Tracer® ZNꢀ520
Sequence of
Operation
The Tracer® ZNꢀ520 operates the fan in the following modes:
1)
2)
3)
4)
5)
occupied
unoccupied
occupied standby
occupied bypass
Tracer Summit with supply fan control
UNT-IOM-6
61
Tracer® ZN.520
Occupied
When the controller is in the occupied mode, the unit attempts to
maintain the space temperature at the active occupied heating or
cooling setpoint, based on the measured space temperature, the
discharge air temperature, the active setpoint, and the proportional/
integral control algorithmꢀ The modulating control algorithm used
when occupied or in occupied standby is described in the following
sectionsꢀ Additional information related to the handling of the control-
ler setpoints can be found in the previous Setpoint operation sectionꢀ
Unoccupied Mode
When the controller is in the unoccupied mode, the controller at-
tempts to maintain the space temperature at the stored unoccupied
heating or cooling setpoint, based on the measured space tempera-
ture, the active setpoint and the control algorithm, regardless of the
presence of a hardwired or communicated setpointꢀ Similar to other
configuration properties of the controller, the locally stored unoccu-
pied setpoints can be modified using Rover™ service toolꢀ
In unoccupied mode, a simplified zone control algorithm is runꢀ During
the cooling mode, when the space temperature is above the cool
setpoint, the primary cooling capacity operates at 100%ꢀ If more
capacity is needed, the supplementary cooling capacity turns on (or
opens to 100%)ꢀ During the heating mode, when the space tempera-
ture is below the heat setpoint, the primary heating capacity turns onꢀ
All capacity is turned off when the space temperature is between the
unoccupied cooling and heating setpointsꢀ Note that primary heating
or cooling capacity is defined by unit type and whether heating or
cooling is enabled or disabledꢀ For example, if the economizer is
enabled and possible, it will be the primary cooling capacityꢀ If
hydronic heating is possible, it will be the primary heating capacityꢀ
Occupied Standby Mode
The controller can be placed into the occupied standby mode when a
communicated occupancy request is combined with the local
(hardwired) occupancy binary input signalꢀ When the communicated
occupancy request is unoccupied, the occupancy binary input (if
present) does not affect the controller’s occupancyꢀ When the
communicated occupancy request is occupied, the controller uses
the local occupancy binary input to switch between the occupied and
occupied standby modesꢀ
During occupied standby mode, the controller’s economizer damper
position goes to the economizer standby minimum positionꢀ The
economizer standby minimum position can be changed using Rover
service toolꢀ
In the occupied standby mode, the controller uses the occupied
62
UNT-IOM-6
Tracer® ZN.520
standby cooling and heating setpointsꢀ Because the occupied
standby setpoints typically cover a wider range than the occupied
setpoints, the Tracer® ZNꢀ520 controller reduces the demand for
heating and cooling the spaceꢀ Also, the outdoor air economizer
damper uses the economizer standby minimum position to reduce
the heating and cooling demandsꢀ
When no occupancy request is communicated, the occupancy binary
input switches the controller’s operating mode between occupied and
unoccupiedꢀ When no communicated occupancy request exists, the
unit cannot switch to occupied standby modeꢀ
Occupied Bypass Mode
The controller can be placed in occupied bypass mode by either
communicating an occupancy request of Bypass to the controller or
by using the timed override On button on the Trane zone sensorꢀ
When the controller is in unoccupied mode, you can press the On
button on the zone sensor to place the controller into occupied
bypass mode for the duration of the bypass time (typically 120
minutes)ꢀ
Occupancy Sources
There are four ways to control the controller’s occupancy:
• Communicated request (usually provided by the building automation
system or peer device)
• By pressing the zone sensor’s timed override On button
• Occupancy binary input
• Default operation of the controller (occupied mode)
A communicated request from a building automation system or
another peer controller can change the controller’s occupancyꢀ
However, if communication is lost, the controller reverts to the default
operating mode (occupied) after 15 minutes (configurable, specified
by the “receive heartbeat time”), if no local hardwired occupancy
signal existsꢀ
A communicated request can be provided to control the occupancy of
the controllerꢀ Typically, the occupancy of the controller is determined
by using time-of-day scheduling of the building automation systemꢀ
The result of the time-of-day schedule can then be communicated to
the unit controllerꢀ
For complete information about the setup for Tracer Summit® applica-
tions of this controller, see the Tracer Summit® product literatureꢀ For
more information on the setup of another building automation system,
UNT-IOM-6
63
Tracer® ZN.520
Tracer Summit® With
Supply Fan Control
refer to the product-specific literature from that manufacturerꢀ
If the unit is communicating with Tracer Summit and the supply fan
control programming point is configured for Tracer (the factory config-
ures as local), then Tracer Summit will control the fan regardless of
the fan mode switch positionꢀ
All Tracer® ZNꢀ520 lockouts (latching diagnostics) are manually reset
whenever the fan mode switch is set to the off position or when power
is restored to the unitꢀ The last diagnostic to occur is retained until
the unit power is disconnectedꢀ Refer to Trane publication, CNT-IOP-2
Tracer® ZNꢀ520 Installation Operation and Programming Guide, for
specific instructions regarding the procedure for running the Tracer®
ZNꢀ520ꢀ
Cooling Operation
The heating and cooling setpoint high and low limits are always
applied to the occupied and occupied standby setpointsꢀ
During the cooling mode, the Tracer® ZNꢀ520 controller attempts to
maintain the space temperature at the active cooling setpointꢀ Based
on the controller’s occupancy mode, the active cooling setpoint is
one of the following:
• Occupied cooling setpoint
• Occupied standby cooling setpoint
• Unoccupied cooling setpoint
The controller uses the measured space temperature, the active
cooling setpoint, and discharge air temperature along with the control
algorithm to determine the requested cooling capacity of the unit (0-
100%)ꢀ The outputs are controlled based on the unit configuration and
the required cooling capacityꢀ To maintain space temperature control,
the Tracer® ZNꢀ520 cooling outputs (modulating hydronic valve, 2-
position hydronic valve, or outdoor air economizer damper) are
controlled based on the cooling capacity outputꢀ
The cooling output is controlled based on the cooling capacityꢀ At 0%
capacity, all cooling capacities are off and the damper is at minimum
positionꢀ Between 0 and 100% capacity, the cooling outputs are
controlled according to modulating valve logic (modulating valves) or
cycled on (2-position valves)ꢀ As the load increases, modulating
outputs open further and binary outputs are energized longerꢀ At
100% capacity, the cooling valve or damper is fully open (modulating
valves) or on continuously (and 2-position valves)ꢀ
Unit diagnostics can affect fan operation, causing occupied and
occupied standby fan operation to be defined as abnormalꢀ Refer to
the Troubleshooting section for more information about abnormal fan
operationꢀ
64
UNT-IOM-6
Tracer® ZN.520
The Tracer® ZNꢀ520 controller operates the supply fan continuously
when the controller is in the occupied and occupied standby modes,
for either heating or coolingꢀ The controller only cycles the fan off with
heating and cooling capacity in the unoccupied modeꢀ
The economizer is used for cooling purposes whenever the outdoor
temperature is below the economizer enable setpoint and there is a
need for coolingꢀ The economizer is used first to meet the space
demand, and other forms of cooling are used if the economizer
cannot meet the demand aloneꢀ See modulating outdoor air damper
operation for additional informationꢀ
Cascade cooling control initiates a discharge air tempering function if
the discharge air temperature falls below the discharge air tempera-
ture control low limit, all cooling capacity is at minimum, and the
discharge control loop determines a need to raise the discharge air
temperatureꢀ The controller then provides heating capacity to raise
the discharge air temperature to its low limitꢀ
Discharge Air Tempering
The discharge air tempering function enables when cold outdoor air is
brought in through the outdoor air damper, causing the discharge air
to fall below the discharge air temperature control low limitꢀ The
controller exits the discharge air tempering function when heat
capacity has been at 0% for five minutesꢀ
During heating mode, the Tracer® ZNꢀ520 controller attempts to
maintain the space temperature at the active heating setpointꢀ Based
on the occupancy mode of the controller, the active heating setpoint
is one of the following:
Heating Operation
• Occupied heating
• Occupied standby heating
• Unoccupied heating
During dehumidification in the heating mode, the controller adjusts
the heating setpoint up to the cooling setpointꢀ This reduces the
relative humidity in the space with a minimum of energy usageꢀ
The controller uses the measured space temperature, the active
heating setpoint, and discharge air temperature, along with the
control algorithm, to determine the requested heating capacity of the
unit (0-100%)ꢀ The outputs are controlled based on the unit configura-
tion and the required heating capacityꢀ
UNT-IOM-6
65
Tracer® ZN.520
Unit diagnostics can affect the Tracer® ZNꢀ520 controller operation,
causing unit operation to be defined as abnormalꢀ Refer to the
Troubleshooting section for more information about abnormal unit
operationꢀ
The heating output is controlled based on the heating capacityꢀ At 0%
capacity, the heating output is off continuouslyꢀ Between 0 and 100%
capacity, the heating output is controlled according to modulating
valve logic (modulating valves) or cycled on (2-position valves)ꢀ As the
load increases, modulating outputs open further and binary outputs
are energized longerꢀ At 100% capacity, the heating valve is fully open
(modulating valves) or on continuously (2-position valves)ꢀ
The Tracer® ZNꢀ520 fan output(s) normally run continuously during the
occupied and occupied standby modes, but cycle between high and
off speeds with heating/cooling during the unoccupied modeꢀ When in
the occupied mode or occupied standby mode and the fan speed is
set at the high, medium, or low position, the fan runs continuously at
the selected speedꢀ Refer to the Troubleshooting section for more
information on abnormal fan operationꢀ
When the unit’s supply fan is set to auto, the controller’s configura-
tion determines the fan speed when in the occupied mode or occu-
pied standby modeꢀ The fan runs continuously at the configured
heating fan speed or cooling fan speedꢀ For all fan speed selections
except off, the fan cycles off during unoccupied modeꢀ
The economizer outdoor air damper is never used as a source of
heatingꢀ Instead, the economizer damper (when present) is only used
for ventilation; therefore, the damper is at the occupied minimum
position in the occupied modeꢀ The damper control is primarily
associated with occupied fan operationꢀ
For multiple fan speed applications, the Tracer® ZNꢀ520 controller
offers additional fan configuration flexibilityꢀ Separate default fan
speeds for heating and cooling modes can be configuredꢀ The fan
runs continuously for requested speeds (off, high, medium, or low)ꢀ
When the fan mode switch is in the Auto position or a hardwired fan
mode input does not exist, the fan operates at the default configured
speedꢀ See Table 21 on page 67 for default fan configuration for heat
and cool modeꢀ During unoccupied mode, the fan cycles between
high speed and off with heating and cooling fan modesꢀ If the re-
quested speed is off, the fan always remains offꢀ
Fan Mode Operation
During dehumidification, when the fan is on Auto, the fan speed can
66
UNT-IOM-6
Tracer® ZN.520
switch depending on the errorꢀ Fan speed increases as the space
temperature rises above the active cooling setpointꢀ
Table 21ꢀ Fan Configuration
Auto fan operation
Fan speed default
Heating Continuous
Off
Low
Medium
High
CoolingContinuous
Low
Off
Medium
High
Additional flexibility built into the controller allows you to enable or
disable the local fan switch inputꢀ The fan mode request can be either
hardwired or communicated to the controllerꢀ When both are present,
the communicated request has priority over the hardwired inputꢀ See
the following tablesꢀ
Table 22ꢀ Local fan switch disabled or not present
Communicated fan speed input
Fan operation
Off
Off
Low
Low
Medium
High
Medium
High
Auto (or not present)
Auto (fan runs at the default speed)
Table 23ꢀ Local fan switch enabled
Communicated
fan speed input
Off
Low
Medium
High
Fan switch (local)
Fan operation
Ignored
Ignored
Ignored
Ignored
Off
Off
Low
Medium
High
Auto
Low
Medium
High
Auto
Off
Low
Medium
High
Auto (configured default, determined by heat/cool mode)
Table 24ꢀ Fan operation in heating and cooling modes
UNT-IOM-6
67
Tracer® ZN.520
Heating
Cooling
Fan mode
Off
Occꢀ Unoccꢀ
Occꢀ
Off
Unoccꢀ
Off
Off
Off
Low
Medium
High
Low
Med Off/High
High Off/High
Off/High
Low
Med
High
Default
fan spꢀ
Off/High
Off/High
Off/High
Off/High
Auto (continuous) Default Off/High
fan spꢀ
During occupied and occupied standby modes, the fan normally is
onꢀ For multiple speed fan applications, the fan normally operates at
the selected or default speed (off, high, medium, or low)ꢀ When fan
mode is auto, the fan operates at the default fan speedꢀ
Continuous Fan
Operation
During unoccupied mode, the controller controls the fan offꢀ While
unoccupied, the controller heats and cools to maintain the unoccu-
pied heating and cooling setpointsꢀ In unoccupied mode, the fan is
controlled on high speed only with heating or coolingꢀ
The unit fan is always off during occupied, occupied standby, and
unoccupied modes when the unit is off due to a diagnostic or when
the unit is in the off mode due to the local zone sensor module, a
communicated request, or the default fan speed (off)ꢀ
If both a zone sensor module and communicated request exist, the
communicated request has priorityꢀ
Tracer® ZNꢀ520 does not support fan cycling in occupied modeꢀ The
fan cycles between high speed and off in the unoccupied mode onlyꢀ
The controller’s cascade control algorithm requires continuous fan
operation in the occupied modeꢀ
Fan Cycling
Operation
When a heating output is controlled off, the Tracer® ZNꢀ520 controller
automatically holds the fan on for an additional 30 secondsꢀ This 30-
second delay gives the fan time to blow off any residual heat from the
heating source, such as a steam coilꢀ When the unit is heating, the
fan off delay is normally applied to control the fan; otherwise, the fan
off delay does not applyꢀ
Fan Off Delay
68
UNT-IOM-6
Tracer® ZN.520
Fan Start on High Speed
On a transition from off to any other fan speed, the Tracer® ZNꢀ520
controller automatically starts the fan on high speed and runs the fan
at high speed for 0ꢀ5 secondsꢀ This provides the ample torque
required to start all fan motors from the off positionꢀ
Tracer® ZNꢀ520 can sample the entering water temperature for all
hydronic main coil changeover unitsꢀHydronic heating/cooling
changeover operation requires central plant operation, and the unit
controller must use an entering water temperature sensor to verify
delivery of the desired water temperature from the central plantꢀ
Entering Water
Temperature
Sampling Function
When three-way valves are ordered with a Tracer® ZNꢀ520 control, the
controller is factory-configured to disable the entering water tempera-
ture sampling function, and the entering water sensor is mounted in
the proper locationꢀ Disabling entering water temperature sampling
eliminates unnecessary water flow through the main coil when three-
way valves are usedꢀ
The Tracer® ZNꢀ520 controller offers a control solution for two-way
valve applications that does not require special unit considerations,
such as those required by bleed linesꢀ The controller includes an
entering water temperature sampling function that periodically opens
the two-way valve to allow temporary water flow, producing reliable
entering water temperature measurementꢀ
ꢀ
Only units using the main hydronic coil for both heating and cooling
(2-pipe changeover and 4-pipe changeover units) use the entering
water temperature sampling functionꢀ Two-pipe changeover and 4-pipe
changeover applications allow the main coil to be used for heating
and for cooling; therefore, these applications require an entering water
temperature sensorꢀ
The entering water temperature value is useful to the unit controller
only when heating or cooling is requiredꢀ The entering water tempera-
ture must be five degrees above the space temperature for hydronic
heating and five degrees below the space temperature for hydronic
coolingꢀ When water flows normally and frequently through the coil,
the controller does not invoke the sampling function because the
water temperature is satisfactory for the desired heating or coolingꢀ
The controller invokes entering water temperature sampling only when
the measured entering water temperature is too cool to heat or too
warm to coolꢀ Entering water is cold enough to cool when it is five
degrees below the measured space temperatureꢀ Entering water is
Heating or Cooling Required
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Tracer® ZN.520
warm enough to heat when it is five degrees above the measured
space temperatureꢀ
When the controller invokes the entering water temperature sampling
function, the unit opens the main hydronic valve for no more than
three minutes before considering the measured entering water
temperatureꢀ An initial stabilization period is allowed to flush the coilꢀ
This period is equal to 30 seconds plus ½ the valve stroke timeꢀ Once
this temperature stabilization period has expired, the controller
compares the entering water temperature against the effective space
temperature (either hardwired or communicated) to determine whether
the entering water can be used for the desired heating or coolingꢀ If
the water temperature is not usable for the desired mode, the control-
ler continues to compare the entering water temperature against the
effective space temperature for a maximum of three minutesꢀ
The controller automatically disables the entering water temperature
sampling and closes the main hydronic valve when the measured
entering water exceeds the high entering water temperature limit (110
F)ꢀ When the entering water temperature is warmer than 110 F, the
controller assumes the entering water temperature is hot because it
is unlikely the coil would drift to a high temperature unless the actual
loop temperature was very highꢀ
If the entering water temperature is unusable — too cool to heat or
too warm to cool — the controller closes the hydronic valve and waits
60 minutes before initializing another samplingꢀ If the controller
determines the entering water temperature is valid for heating or
cooling, it resumes normal heating/cooling control and effectively
disables entering water temperature sampling until it is requiredꢀ
The Tracer® ZNꢀ520 controller supports 1- or 2-stage electric heat
operation for heatingꢀ To control the space temperature, electric heat
is cycled to control the discharge air temperatureꢀ The rate of cycling
is dependent upon the load in the space and the temperature of the
incoming fresh air from the economizer (if any)ꢀTwo-pipe changeover
units with electric heat use the electric heat only when hot water is
not availableꢀ
Electric Heat Operation
Fresh Air Damper
Options
Manual
Units with the manual fresh air damper option ship with the damper in
the closed position, which is adjustable from zero to 100 percent in
25 percent incrementsꢀ To adjust the position, first remove the air filter
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Tracer® ZN.520
to expose the damper stop screw on the control panel endꢀ Relocate
the stop screw to the appropriate positionꢀ Then loosen the stop
screw wingnut and adjust the linkageꢀ
Economizer Damper
With a valid outdoor air temperature (either hardwired or communi-
cated), Tracer® ZNꢀ520 uses the modulating economizer damper as
the highest priority source of coolingꢀ Economizer operation is only
possible through the use of a modulating damperꢀ
Economizing is possible during the occupied, occupied standby,
unoccupied, and occupied bypass modesꢀ
The controller initiates the economizer function if the outdoor air
temperature is cold enough to be used as free cooling capacityꢀ If the
outdoor air temperature is less than the economizer enable setpoint
(absolute dry bulb), the controller modulates the outdoor air damper
(between the active minimum damper position and 100%) to control
the amount of outdoor air cooling capacityꢀ When the outdoor air
temperature rises 5 F above the economizer enable point, the control-
ler disables economizing and moves the outdoor air damper back to
its predetermined minimum position based on the current occupancy
mode or communicated minimum damper positionꢀ
Table 25ꢀ Relationship Between Outdoor Temperature Sensors
and Damper Position
Outdoor Air Tempꢀ
None or invalid
Failed
Modulating Outdoor Air Damper
Occꢀ or
Occꢀ standby Unoccꢀ
Occꢀ bypass
Open to occꢀ
minꢀposꢀ
Open to occꢀ
standby
minꢀ posꢀ
Open to occꢀ
standby
Closed
Closed
Open to occꢀ
minꢀposꢀ
minꢀ posꢀ
Present and econꢀ
feasible
Economizing: Economizing: Open and
min posꢀ-100% between occꢀ econꢀ only
standby minꢀ
posꢀ-100%
when unit
operating,
closed
otherwise
Present and econꢀ
not feasible
Open tooccꢀ
minꢀ posꢀ
Open to occꢀ
standby
Closed
minꢀ posꢀ
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Tracer® ZN.520
Dehumidification
Dehumidification is possible when mechanical cooling is available,
the heating capacity is located in the reheat position, and the space
relative humidity setpoint is validꢀThe controller starts dehumidifying
the space when the space humidity exceeds the humidity setpointꢀ
The controller continues to dehumidify until the sensed humidity falls
below the setpoint minus the relative humidity offsetꢀThe controller
uses the cooling and reheat capacities simultaneously to dehumidify
the spaceꢀ While dehumidifying, the discharge air temperature is
controlled to maintain the space temperature at the current setpointꢀ
A typical scenario involves high humidity and high temperature load of
the spaceꢀThe controller sets the cooling capacity to 100% and uses
the reheat capacity to warm the discharge air to maintain space
temperature controlꢀDehumidification may be disabled via Tracer or
configurationꢀ
Note: If the unit is in the unoccupied mode, the dehumidification
routine will not operateꢀ
Data Sharing
Because this controller utilizes LonWorks™ technology, the control-
ler can send or receive data (setpoint, heat/cool mode, fan request,
space temperature, etcꢀ) to and from other controllers on the commu-
nication link, with or without the existence of a building automation
systemꢀ This applies to applications where multiple unit controllers
share a single space temperature sensor (for rooms with multiple
units but only one zone sensor) for both standalone (with communica-
tion wiring between units) and building automation system applica-
tionsꢀ For this application you will need to use the Rover service toolꢀ
For more information on setup, refer to the Trane publication EMTX-
IOP-2ꢀ
Binary Inputs
The Tracer® ZNꢀ520 controller has four available binary inputsꢀ Nor-
mally, these inputs are factory-configured for the following functions:
• Binary input 1: Low temperature detection (freezestat)
• Binary input 2: Condensate overflow
• Binary input 3: Occupancy/ Generic
• Binary input 4: Fan status
Note: The generic binary input can be used with a Tracer Summit®
building automation system onlyꢀ
Each binary input default configuration (including normally open/
closed) is set at the factoryꢀHowever, you can configure each of the
four binary inputs as normally open or normally closedꢀ The controller
will be set properly for each factory-supplied binary input end-deviceꢀ
When no device is connected to the input, configure the controller’s
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Tracer® ZN.520
Table 26ꢀ Binary Input Configurations
Binary
Controller operation
Input Description
Configuration
Normally closed
Contact closed
Normal
Contact open
Diagnostic
(note 5)
Diagnostic
(note 5)
BI 1
BI 2
BI 3
BI 3
BI 4
Low temperature
detection (Note 1)
Condensate overflow (Note 1)
Normally closed
Normally open
Normally open
Normally open
Normal
Occupancy
Unoccupied
Normal (Note 3)
Normal
Occupied
Generic binary input
Fan status (Note 1)
Normal
(Note 3)
Diagnostic
(Note 4)
Note 1: During low temperature, condensate overflow, and fan status diagnostics, the Tracer® ZNꢀ520
control disables all normal unit operation of the fan, valves, and damperꢀ
Note 2: The occupancy binary input is for standalone unit controllers as an occupied/unoccupied inputꢀ
However, when the controller receives a communicated occupied/unoccupied request, the communicated
request has priority over the hardwired inputꢀ
Note 3: The generic binary input does not affect unit operationꢀ A building automation system reads this
input as a generic binary input
Note 4: If the fan mode input is in the off position or the controller is in the unoccupied mode with the fan
off, the fan status input will be openꢀ A diagnostic will not be generated when the controller commands the
fan offꢀ A diagnostic will only be generated if the fan status input does not close after one minute from
energizing a fan output or any time the input is open for one minuteꢀ The controller waits up to one minute
after energizing a fan output to allow the differential pressure to build up across the fanꢀ
Note 5: The table below shows the controller’s response to low temperature detection, condensate
overflow, and fan status diagnosticsꢀ
input as not usedꢀ
BIP
Description
Fan
Valve
Electric heat
Damper
BI 1
BI 2
BI 4
Low temperature detection
Condensate overflow
Fan status
Off
Off
Off
Open
Closed
Closed
Off
Off
Off
Closed
Closed
Closed
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Tracer® ZN.520
Binary Outputs
Binary outputs are configured to support the following:
• Three fan stages (when one or two fan stages are present, medium
fan speed can be configured as exhaust fan)
• One hydronic cooling stage
• One hydronic heating stage (dehumidification requires this to be in
the reheat position)
• One DX cooling stage
• One- or two-stage electric heat (dehumidification requires this to be
in the reheat position)
• Face and bypass damper
• Modulating outdoor air damper
• One baseboard heat stage
Table 27ꢀ Binary Output Configuration
Binary Output
Configuration
J1-1
J1-2
J1-3
J1-4
J1-5
Fan high
Fan medium
Fan low
(Key)
Cool valve – open, or 2 position valve,
(Note 1)
J1-6
J1-9
Cool valve – close (Note 1)
Heat valve – open, or 2 position valve, or 1st
Electric heat stage (Note 1)
Heat valve – close or 2nd Electric heat stage
(Note 1)
J1-10
J1-11
J1-12
TB4-1
TB4-2
Fresh air damper - open
Fresh air damper - close
Generic / Bbaseboard heat output
24VAC
Note 1: For Tracer® ZNꢀ520 units configured and applied as 2-pipe
hydronic heat/cool changeover, terminals J1-5 and J1-6 are used to
control the primary valve for both heating and coolingꢀ For Tracer®
ZNꢀ520 units configured and applied as 2-pipe hydronic heat/cool
changeover with electric heat, terminals J1-5 and J1-6 are used to
control the primary valve (for both cooling and heating), and terminals
J1-9 and J1-10 are used only for the electric heat stageꢀ For those 2-
pipe changeover units, electric heat will not be energized while the
hydronic supply is hot (5 or more degrees above the space tempera-
ture)ꢀ
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Tracer® ZN.520
Analog Inputs
Table 28ꢀ Analog Inputs
Description
Terminals
Function
Range
Zone
TB3-1
Space temperature input
5° to 122°F (-15° to 50°C)
Ground
Set
TB3-2
TB3-3
TB3-4
Analog ground
Setpoint input
Fan switch input
NA
40° to 115°F (4ꢀ4° to 46ꢀ1°C)
Fan
4821 to 4919 W (Off)
2297 to 2342 W (Auto)
10593 to 10807 W (Low)
13177 to 13443 W (Medium)
15137 to 16463 W (High)
Ground
TB3-6
Analog ground
NA
Analog Input 1 J3-1
J3-2
Entering water temperature
Analog ground
-40° to 212°F (-40° to 100°C)
NA
Analog Input 2 J3-3
J3-4
Discharge air temperature
Analog ground
-40° to 212°F (-40° to 100°C)
NA
Analog Input 3 J3-5
J3-6
Fresh air temp/Generic temp
Analog ground
-40° to 212°F (-40° to 100°C)
NA
Analog Input 4 J3-7
Universal Input
Generic 4-20ma
Humidity
0 – 100%
0 – 100%
0 – 2000ppm
CO2
J3-8
Analog ground
NA
NA
Ground
J3-9
Analog ground
Notes:
1) The zone sensor, entering water temperature sensor, discharge air sensor, and the outside air tempera-
ture sensor are 10KW thermistorsꢀ
2) Zone sensor:
Wall mounted sensors include a thermistor soldered to the sensor’s circuit boardꢀ
Unit mounted sensors include a return air sensor in the units return air streamꢀ
3) Changeover units include an entering water temperature sensorꢀ
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Tracer® ZN.520
The Tracer® ZNꢀ520 controller accepts the following zone sensor
module inputs:
Zone Sensor
• Space temperature measurement (10kW thermistor)
• Local setpoint (either internal or external on the zone sensor
module)
• Fan switch
• Timed override (On) and Cancel timed override
• Communication jack
Space Temperature
Measurement
Trane zone sensors use a 10kW thermistor to measure the space
temperatureꢀ Typically, zone sensors are wall-mounted in the room
and include a space temperature thermistorꢀ As an option, the zone
sensor can be unit-mounted with a separate space temperature
thermistor located in the unit’s return air streamꢀ If both a hardwired
and communicated space temperature value exist, the controller
ignores the hardwired space temperature input and uses the commu-
nicated valueꢀ
Zone sensors with an external setpoint adjustment (1kW) provide the
Tracer® ZNꢀ520 controller with a local setpoint (50 to 85 F or 10 to
29ꢀ4 C)ꢀ The external setpoint is exposed on the zone sensor’s front
coverꢀ
External Setpoint Adjustment
When the hardwired setpoint adjustment is used to determine the
setpoints, all unit setpoints are calculated based on the hardwired
setpoint value, the configured setpoints, and the active mode of the
controllerꢀ The hardwired setpoint is used with the controller’s occu-
pancy mode (occupied, occupied standby, or unoccupied), the
heating or cooling mode, the temperature deadband values, and the
heating and cooling setpoints (high and low limits) to determine the
controller’s active setpointꢀ
When a building automation system or other controller communicates
a setpoint to the controller, the controller ignores the hardwired
setpoint input and uses the communicated valueꢀ The exception is
the unoccupied mode, when the controller always uses the stored
default unoccupied setpointsꢀ After the controller completes all
setpoint calculations, based on the requested setpoint, the occu-
pancy mode, the heating and cooling mode, and other factors, the
calculated setpoint is validated against the following setpoint limits:
• Heating setpoint high limit
• Heating setpoint low limit
• Cooling setpoint high limit
• Cooling setpoint low limit
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Tracer® ZN.520
These setpoint limits only apply to the occupied and occupied
standby heating and cooling setpointsꢀ These setpoint limits do not
apply to the unoccupied heating and cooling setpoints stored in the
controller’s configurationꢀ
When the controller is in unoccupied mode, it always uses the stored
unoccupied heating and cooling setpointsꢀThe unit can also be
configured to enable or disable the local (hardwired) setpointꢀ This
parameter provides additional flexibility to allow you to apply commu-
nicated, hardwired, or default setpoints without making physical
changes to the unitꢀ
Similar to hardwired setpoints, the effective setpoint value for a
communicated setpoint is determined based on the stored default
setpoints (which determines the occupied and occupied standby
temperature deadbands) and the controller’s occupancy modeꢀ
The zone sensor fan switch provides the controller with an occupied
(and occupied standby) fan request signal (Off, Low, Medium, High,
Auto)ꢀ If the fan control request is communicated to the controller, the
controller ignores the hardwired fan switch input and uses the com-
municated valueꢀ The zone sensor fan switch input can be enabled or
disabled through configuration using the Rover service toolꢀ If the zone
sensor switch is disabled, the controller resorts to its stored configu-
ration default fan speeds for heating and cooling, unless the controller
receives a communicated fan inputꢀ
Fan Switch
When the fan switch is in the off position, the controller does not
control any unit capacityꢀ The unit remains powered and all outputs
drive to the closed positionꢀUpon a loss of signal on the fan speed
input, the controller reports a diagnostic and reverts to using the
default fan speedꢀ
Momentarily pressing the on button during unoccupied mode places
the controller in occupied bypass mode for 120 minutesꢀ You can
adjust the number of minutes in the unit controller configuration using
Rover service toolꢀ The controller remains in occupied bypass mode
until the override time expires or until you press the Cancel buttonꢀ
Communication jack
On/Cancel Buttons
Use the RJ-11 communication as the connection point from Rover™
service tool to the communication link—when the communication
jack is wired to the communication link at the controllerꢀ By access-
ing the communication jack via Rover™, you gain access to any
controller on the linkꢀ
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Tracer® ZN.520
Table 29ꢀ Zone sensor wiring connections
TB1
1
2
Description
Space temperature
Common
3
Setpoint
4
Fan mode
5
6
Communications
Communications
The Tracer® ZNꢀ520 controller communicates via Trane’s Comm5
protocolꢀ Typically, a communication link is applied between unit
controllers and a building automation systemꢀ Communication also is
possible via Rover, Trane’s service toolꢀ Peer-to-peer communication
across controllers is possible even when a building automation
system is not presentꢀYou do not need to observe polarity for Comm5
communication linksꢀ
Communications
The controller provides six 0ꢀ25-inch quick-connect terminals for the
Comm5 communication link connections, as follows:
• Two terminals for communication to the board
• Two terminals for communication from the board to the next unit
(daisy chain)
• Two terminals for a connection from the zone sensor back to the
controller
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Diagnostics
Table 30ꢀ Tracer® ZNꢀ520 Diagnostics
Diagnostic
Fan
Other Outputs (Note 1)
Condensate overflow
Off
Valves Closed, Fresh air damper Closed, electric heat Off,
Baseboard heat Off
Low temperature detection
Low air flow - fan failure
Off
Off
Off
On
Valves Open, Fresh air damper Closed, electric heat Off,
Baseboard heat Off
Valves Closed, Fresh air damper Closed, electric heat Off,
Baseboard heat Off
Valves Closed, Fresh air damper Closed, electric heat Off,
Baseboard heat Off
Valves Enabled (Note 2), Fresh air damper
Enabled (Note 2), electric heat Enabled (Note 2), Baseboard
heat Off
Space temperature failure
Entering water temp failure
Discharge air temp low limit
Discharge air temp failure
Fresh air temp failure
Relative humidity failure
Generic 4-20ma failure
CO2 Input failure
Off
Off
On
On
On
On
On
On
On
Off
Valves Open, Fresh air damper Closed, electric heat Off,
Baseboard heat Off
Valves Closed, Fresh air damper Closed, electric heat Off,
Baseboard heat Off,
Valves Enabled, Fresh air damper Minimum position3, electric
heat Enabled, Baseboard heat Enabled
Valves Enabled, Fresh air damper Enabled, electric heat
Enabled, Baseboard heat Enabled
Valves Enabled, Fresh air damper Enabled, electric heat
Enabled, Baseboard heat Enabled
Valves Enabled, Fresh air damper Enabled, electric heat
Enabled, Baseboard heat Enabled
Valves Enabled, Fresh air damper Enabled, electric heat
Enabled, Baseboard heat Enabled
Valves Enabled, Fresh air damper Enabled, Electric Heat
Enabled, Baseboard heat Enabled
Maintenance required
Local fan mode failure
Local setpoint failure
Invalid unit configuration
Normal – power up
Valves Enabled, Fresh air damper Enabled, electric heat
Enabled, Baseboard heat Enabled
Valves Disabled, Fresh air damper Disabled, electric heat
Disabled, Baseboard heat Disabled
Valves Enabled, Fresh air damper Enabled, Electric heat
Enabled
On
Note 1: The generic binary output (TB4-1, TB4-2) state is unaffected by all unit diagnosticsꢀ
Note 2: When the entering water temperature is required but not present, the Tracer® ZNꢀ520 controller
generates a diagnostic to indicate the sensor loss conditionꢀ The controller automatically clears the
diagnostic once a valid entering water temperature value is present (non-latching diagnostic)ꢀ When the
entering water temperature sensor fails, the controller prohibits all hydronic cooling operation, but allows
the delivery of heat when heating is requiredꢀ In the Cool mode, all cooling is locked-out, but normal fan
and outdoor air damper operation is permittedꢀ
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Tracer® ZN.520
Note 3: When the outdoor air temperature sensor has failed or is not
present, the Tracer® ZNꢀ520 controller generates a diagnostic to
indicate the sensor loss conditionꢀ The controller automatically clears
the diagnostic once a valid outdoor air temperature value is present
(non-latching diagnostic)ꢀ When the outdoor air temperature sensor
fails or is not present, the controller prohibits economizer operationꢀ
The controller senses and records each diagnostic independently of
other diagnosticsꢀ It is possible to have multiple diagnostics present
simultaneouslyꢀ The diagnostics are reported in the order they occurꢀ
Possible diagnostics include:
• Low Temperature Detection
• Low Air Flow - Fan Status
• Space Temperature Failure1
• Discharge Air Temp Failure1
• Local Setpoint Failure1
• CO2 Sensor Failure1
• Condensate Overflow
• Discharge Air Temp Limit
• Entering Water Temp Failure1
• Outdoor Air Temp Failure1
• Local Fan Mode Failure1
• Generic AIP Failure1
• Defrosting Compressor Lockout1
• Invalid Unit Configuration
• Discharge air low limit
• Humidity Input Failure1
• Maintenance Required
Translating Multiple
Diagnostics
• Generic temperature failure
1 Non-latching diagnostics automatically reset when the input is
present and validꢀ
There are six ways to reset unit diagnostics:
• Automatically by the controller
• By initiating a manual output test at the controller
• By cycling power to the controller
• By using a building automation system
• By using the Rover service tool
• By using any other communicating device able to access the
controller’s diagnositc reset input
• By cycling the fan switch from off to any speed setting
Automatically: The Tracer® ZNꢀ520 controller includes an automatic
diagnostic reset functionꢀThis function attempts to automatically
recover a unit when the Low Temperature Detection diagnostic
occursꢀWhen this diagnostic occurs, the controller responds as
defined in the Diagnostics table in the previous Summary sectionꢀ
After the controller detects the Low Temperature Detection diagnos-
tic, the unit waits 30 minutes before invoking the automatic diagnostic
reset functionꢀThe automatic diagnostic reset function clears the Low
Temperature Detection diagnostic and attempts to restore the control-
ler to normal operationꢀThe controller resumes normal operation until
another diagnostic occursꢀ
Resetting
Diagnostics
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UNT-IOM-6
Tracer® ZN.520
If a Low Temperature Detection diagnostic recurs within 24 hours after
an automatic diagnostic reset, you must manually reset the diagnos-
ticꢀ See other possible methods for resetting diagnostics in this
sectionꢀ
Manual output test: You can use the Test button on the controller
either during installation to verify proper end device operation or during
troubleshootingꢀWhen you press the Test button, the controller
exercises all outputs in a predefined sequenceꢀ The first and last
outputs of the sequence reset the controller diagnosticsꢀ See the
previous section for more information about the manual output testꢀ
Cycling power: When someone turns off the controller’s 24 VAC
power, then re-applies power, the unit cycles through a power up
sequenceꢀBy default, the controller attempts to reset all diagnostics
at power upꢀDiagnostics present at power up and those that occur
after power up are handled according to the defined unit diagnostics
sequences (see previous Diagnostics table)ꢀ
Building automation system: Some building automation systems can
reset diagnostics in the Tracer® ZNꢀ520 controllerꢀFor more complete
information, refer to the product literature for the building automation
systemꢀ
Rover™ service tool: Rover service tool can reset diagnostics in the
Tracer® ZNꢀ520 controllerꢀ For more complete information, refer to the
Rover™ Installation, Operation, and Programming manualꢀ
Diagnostic reset: Any device that can communicate the network
variable nviRequest (enumeration “clear_alarm”) can reset diagnostics
in the Tracer® ZNꢀ520 controllerꢀThe controller also attempts to reset
diagnostics whenever power is cycledꢀ
Cycling the fan switch: If the user cycles the fan speed switch from
off to any speed, the controller resets all diagnosticsꢀDiagnostics
may recur immediately if the problem still existsꢀ
The green LED normally indicates whether or not the controller is
powered on (24 VAC)ꢀ
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Tracer® ZN.520
Table 31ꢀ Red Service LED Activity
LED Operation
LED Activity
Description
Red Service LED
Off continuously after
power is applied to the
controllerꢀ
Normal operation
On continuously, even when
power is first applied to the
controllerꢀ
Someone is pressing the Service
button or the controller has failedꢀ
LED flashes about once
every secꢀ
Uninstall (normal controller mode)ꢀ
Use Rover™ service tool to restore
normal unit operationꢀ
Black Service push button
Use the Service button to install the
Tracer® ZNꢀ520 controller in a
communication networkꢀ
Caution: If the Service push button is held down for more
than 15 seconds, the Tracer® ZN.520 controller will
uninstall itself from the ICS™ communication network
and shut down all unit operation. This mode is indicated
by the red Service LED flashing once every second. See
the Red Service LED section. Use Rover™ service tool to
restore the unit to normal operation. Refer to the Rover™
product literature for more information.
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Troubleshooting
Green Status LED
Table 32ꢀ Green Status LED activity
Green LED activity
On continuously
Blinks (one blink)
Description
Power on (normal operation)
The controller is in manual output test modeꢀ
No diagnostics presentꢀ
Blinks (2 blinks)
The controller is in manual output test modeꢀ
One or more diagnostics are presentꢀ
Wink mode (Note 1)ꢀ
LED blinks (1/4 secꢀ
on, 1/4 secꢀ, off for
10 sec)
LED off
Power is offꢀ
Controller failureꢀ
Test button is pressedꢀ
Note 1: The Wink feature allows you to identify a controllerꢀ By
sending a request from Rover service tool, you can request the
controller to wink (blink on and off as a notification that the controller
received the signal)ꢀ The green LED blinks (1/4 second on, 1/4
second off for 10 seconds) during Wink modeꢀ
Yellow Comm LED
The yellow Comm LED blinks at the rate the controller receives
communicationꢀ The yellow LED does not blink when the controller is
transmitting communication dataꢀ
Table 33ꢀ Yellow Comm LED Activity
LED activity
Description
Off continuously
The controller is not detecting any
communicationꢀ (Normal for
standalone applicationsꢀ)
The controller detects communica
tionꢀ (Normal for communicating
applications, including data shar
ingꢀ)
LED blinks or flickers
LED on continuously
Abnormal condition or extremely
high traffic on the linkꢀ
The test sequence verifies outputand end device operationꢀ Use the
manual output test to verify output wiring and actuator operation
without using Rover™ service toolꢀ
If the diagnostics remain after an attempt to clear diagnostics, the
status LED indicates the diagnostic condition is still present and may
affect the manual output testꢀSee the Green Status LED sectionꢀ
Advancing completely through the test sequence terminates manual
testꢀ The controller will time out if the unit remains in a single step for
one hourꢀ
UNT-IOM-6
83
Tracer® ZN.520
The procedure for testing is:
Manual Output Test
1ꢀPress and hold the Test button for at least two seconds, then
release the button to start the test modeꢀ When manual output test
mode begins, the controller turns off all outputs and calibrates
modulating end devices closedꢀ
Test Sequence
2ꢀ Press the Test button (no more than once per second) to advance
through the test sequenceꢀ Alternatively, the manual output test can
be controlled over the communications network by using Rover™ꢀ
Table 34ꢀ Test Sequence
Step
Fan
Main valve
Electric heat
or auxꢀ valve
Fresh
air
damper
Generic/
baseboard
heat
J1-1
J1-2
J1-3
J1-5
J1-6
J1-9
J1-10 J1-11 J1-12
TB4-1
1: Off 1
Off
Off
Off
Off
On
Off
aux: on Off
EH: off
On
Off
2
2: Fan High
3: Fan Med
4: Fan low
High
Off
Off
Off
Off
Low
Off
Off
Off
Off
Off
Off
Off
On
Off
Off
Off
Off
Off
Off
Off
On
Off
Off
Off
Off
Off
Off
On
On
Off
Off
Off
Off
Off
Off
Off
On
Off
Off
Off
Off
Off
Off
On
Off
Off
Off
Off
Off
Off
Off
Off
Off
Off
Off
Off
Off
Off
Med
Off
Off
5: Main open
High
High
High
High
Off
6: Main close,
EH1 on
Off
7: Aux open,
EH1 on
Exh
Off
8: Aux close,
EH1 off, EH2 on,
damper open
9: Damper close High
Off
Off
Off
Off
Off
Off
Off
Off
Off
Off
Off
Off
Off
Off
On
Off
Off
On
10: Generic/
baseboard
heat energized
11: Exit 6
High
Exit
1Upon entering manual output test mode, the controller turns off all fan and electric heat outputs and drives
The green status LED is off when you press the Test buttonꢀTo begin
LED Operation
the manual output test mode, press and hold the Test button (which
causes the green LED to go off) for at least two seconds, then
release the buttonꢀThe green LED blinks, indicating the controller is in
manual test modeꢀ
84
UNT-IOM-6
Tracer® ZN.520
Troubleshooting
Table 35ꢀ Fan outputs do not energize
Probable Cause
Explanation
Random start observed
After power up, the controller always observes a random start from zero
to 25 secondsꢀThe controller remains off until the random start time
expiresꢀ
Power up control wait
Cycling fan operation
Unoccupied operation
When power up control wait is enabled (non-zero time), the controller
remains off until one of two conditions occur:The controller exits power
up control wait once it receives communicated informationꢀThe controller
exits power up control wait once the power up control wait time expiresꢀ
The controller operates the fan continuously when in the occupied,
occupied standby, or occupied bypass modeꢀ When the controller is in
the unoccupied mode, the fan is cycled between high speed and off with
capacityꢀ
When the controller is in the unoccupied mode, the fan is cycled
between high speed and off with capacity to maintain zone temperature
controlꢀ
Fan mode off
`
When a local fan mode switch (provided on the Trane zone sensor)
determines the fan operation, the off position controls the unit offꢀ
Requested mode off
You can communicate a desired operating mode (such as off, heat,
and cool) to the controllerꢀ When off is communicated to the controller,
the unit controls the fan offꢀ There is no heating or coolingꢀ
Diagnostic present
A specific list of diagnostics affects fan operationꢀ For more information,
see the Diagnostics sectionꢀ
No power to the
controller
If the controller does not have power, the unit fan does not operateꢀ For
the Tracer® ZNꢀ520 controller to operate normally, it must have an input
voltage of 24 VACꢀ When the green LED is off continuously, the control
ler does not have sufficient power or has failedꢀ
Unit configuration
Manual output test
The controller must be properly configured based on the actual installed
end devices and applicationꢀ When the unit configuration does not match
the actual end devices, the valves may not work correctlyꢀ
The controller includes a manual output test sequence you can use
to verify output operation and associated output wiringꢀ However, based
on the current step in the test sequence, the unit fan may not be onꢀ
Refer to the Manual Output Test sectionꢀ
Unit wiring
The wiring between the controller outputs and the fan relays and con
tacts must be present and correct for normal fan operationꢀ
UNT-IOM-6
85
Tracer® ZN.520
Table 36ꢀ Valves Stay Closed
Probable Cause
Explanation
Requested mode off
You can communicate a desired operating mode (such as off, heat, and
cool) to the controllerꢀ When off is communicated to the controller, the
unit controls the fan offꢀ There is no heating or cooling (valves are
closed)ꢀ
Power up control wait
Manual output test
When power up control wait is enabled (non-zero time), the controller
remains off until one of two conditions occurs:The controller exits power
up control wait once it receives communicated informationꢀThe controller
exits power up control wait once the power up control wait time expiresꢀ
The controller includes a manual output test sequence you can use to
verify output operation and associated output wiringꢀ However, based on
the current step in the test sequence, the valve(s) may not be openꢀ
Refer to the Manual Output Test sectionꢀ
Fan mode off
When a local fan mode switch (provided on the Trane zone sensor)
determines the fan operation, the off position controls the unit off and
valves to closeꢀ
Sampling logic
The controller includes entering water temperature sampling logic which
is automatically invoked during 2-pipe and 4-pipe changeover when the
entering water temperature is either too cool or too hot for the desired
heating or coolingꢀRefer to the Entering Water Temperature Sampling
sectionꢀ
Diagnostic present
Unit configuration
A specific list of diagnostic affects valve operationꢀ For more information,
see the Diagnostics sectionꢀ
The controller must be properly configured based on the actual installed
end devices and applicationꢀ When the unit configuration does not match
the actual end devices, the valves may not work correctlyꢀExample: A 2-
pipe heat/cool changeover unit will not cool if the entering water tempera
ture is too warm for cooling or if the entering water sensor is not presentꢀ
The unit will not heat if the entering water temperature is too cool for
heatingꢀ
Unit wiring
The wiring between the controller outputs and the valve(s) must be
present and correct for normal valve operationꢀ
Random start observed
After power up, the controller always observes a random start from 0 to
25 secondsꢀ The controller remains off until the random start time
expiresꢀ
86
UNT-IOM-6
Terminal Unit
Control (TUC)
The TUC is capable of operating
in either a standalone application
or interfacing with a Trane
Tracer® systemꢀ In addition,
Trane EveryWareä software is
available to edit the configuration
of the TUCꢀ
The TUC board is easily access-
ible on an isolation panel in the
control panelꢀ The TUC board will
pivot down in the control panel
box after removing the screw on
the top right corner of the panelꢀ
See Figure 29ꢀ
Figure 29. The TUC module
board.
TUC Sequence of Operations
Off: Fan is off; control valve options and fresh air damper options
closeꢀ The low air temperature detection option is still activeꢀ
Auto: Fan speed control in the auto setting allows the modulating
(three-wire floating point) control valve option and three-speed fan to
work cooperatively to meet precise capacity requirements, while
minimizing fan speed (motor/energy/acoustics) and valve position
(pump energy/chilled water reset)ꢀ As the capacity requirement
increases at low fan speed, the water valve opensꢀ When the low fan
speed capacity switch point is reached, the fan switches to medium
speed and the water valve repositions to maintain an equivalent
capacityꢀ The reverse sequence takes place with a decrease in
required capacityꢀ
Low/Med/High: The fan will run continuously at the selected speed
and the valve option will cycle to meet setpointꢀ
UNT-IOM-6
87
Terminal Unit
Control (TUC)
For TUC controlled units that will interface with the Trane Tracer®
system or Tracer Summit® building management system, terminate
the communication wiring in the control box at the designated
terminals on the low voltage terminal stripꢀ Reference the unit wiring
schematic or submittalsꢀ
Tracer®
Communication
Wiring
Take care to maintain the correct polarity throughout the communica-
tion wiring circuitꢀ
Ground shields at each TUC, taping the opposite end of each shield
to prevent any connection between the shield and another groundꢀ
Refer to Trane publication, EMTX-IOP-1 Installation Operation and
Programming Guide, for the communication wiring diagramꢀ
Communication wire must conform to the following specification:
· Shielded twisted pair 18 AWG
· Capacitance 23 (21-25) picofarads (pF) per foot
· Listing/Rating - 300V 150C NEC 725-2 (b) Class 2 Type
CL2P
· Trane Part Noꢀ 400-20-28 or equivalent, available through
Trane BAS Buying Group Accessories catalog
Follow these general guidelines when installing communication
wiring:
· Maintain a maximum 5000 ftꢀ aggregate run
· Install all communication wiring in accordance with the
NEC and all local codesꢀ
· Solder the conductors and insulate (tape) the joint suffi-
ciently when splicing communication wireꢀ Do not use wire
nuts to make the spliceꢀ
· Do not pass communication wiring between buildings
because the unit will assume different ground potentialsꢀ
· Do not run power in the same conduit or wire bundle with
communication link wiringꢀ
88
UNT-IOM-6
Terminal Unit
Control (TUC)
Establish service communication to the TUC by connecting a twisted
wire pair to one of the following connection pointsꢀ
· Remote zone sensor module
· Low voltage terminal strip inside the control panel
This will allow the technician to view and edit the TUC configuration
and troubleshoot the unitꢀ However, control options ordered and the
wiring practice followed in the field may limit the communication
abilityꢀ
Service
Communication
Wiring
Route interconnection wiring from the TUC to provide service commu-
nication at the wall-mounted zone sensor moduleꢀ Install wiring by
referencing the unit wiring schematic and Table 3 on page 35 for
appropriate wire sizesꢀ After wiring is complete, connect the comm4
port on the zone sensor module with a telephone style RJ 11 connec-
tor (Western Electric #616 or equivalent)ꢀ Run the telephone style
connector to a laptop computer running Trane EveryWareä software
to establish communicationꢀ
Wall-Mounted
Zone Sensor
Module
Zone sensors without interconnecting wiring:
Establish service communication to the TUC by wiring to the low
voltage terminal strip inside the control boxꢀ Reference the unit wiring
schematic for the appropriate communication terminals on the low
voltage terminal stripꢀ Maintain the correct polarity throughout the
communication wiring circuitꢀ
Once wiring is complete, use Trane EveryWareä software to commu-
nicate to the TUCꢀ The comm4 connection can be made by the
telephone style RJ 11 connector (Western Electric #616 or equivalent)
on the zone sensor module and the computer using EveryWareä ꢀ
Refer to Trane publication, EMTX-IOP-1 Installation Operation Pro-
gramming Guide, to operate the TUC with Trane Integrated Comfortsm
System (ICS)ꢀ The factory pre-programs the TUC with default values
to control the temperature and unit air flowꢀ Use Tracer® building
automation system or EveryWareä software to change the default
valuesꢀ
Terminal Unit
Controller Start-Up
Follow the procedure below to operate the TUC in a stand-alone
operationꢀ
1ꢀ Turn power on at the disconnect switch optionꢀ
2ꢀ Position the fan mode switch to either high, medium, low, or the
auto positionꢀ
UNT-IOM-6
89
Terminal Unit
Control (TUC)
3ꢀ Rotate the setpoint dial on the zone sensor module to 55° F for
cooling or 85° F for heatingꢀ
The appropriate control valve will actuate assuming the following
conditions:
· Room temperature should be greater than 55° F and less
than 85° F
· For a 2-pipe fan-coil unit with an automatic changeover
sensor, the water temperature input is appropriate for the
demand placed on the unit, eꢀgꢀ cooling operation is re-
quested and cold water (5° F lower than room temperature
for a TUC) flows into the unitꢀ
4ꢀ Select the correct temperature setpointꢀ
Note: Select and enable zone sensor temperature settings to prevent
freeze damage to unitꢀ
TUCs connected to a Tracer® comm 4 communication link requires a
unique addressꢀ Use the TUC’s eight DIP switches to set the ICS
addressꢀ The address must be in the valid range of 33 to 96ꢀ See
Table 21 on page 63 for address settingsꢀ
TUC Human
Interface
To set the ICS address, perform the following steps:
Setting the ICS Ad-
dress for Tracer Com-
munications
1ꢀ Set the DIP switches to the correct addressꢀ ON implies that the
DIP switch is pressed towards the DIP switch numberꢀ OFF implies
that the DIP switch is pressed towards the OPEN positionꢀ
2ꢀ Short and hold the test input (J11 and J12) until all LEDs are
illuminatedꢀ Remove the jumper from the test inputꢀ This sets the
address in the TUC EEPROMꢀ
Note: Cycling power to the TUC forces the TUC to read the DIP
switch settings (Rev 12 TUC or higher)ꢀ The TUC firmware version
can be read from either Tracer or Everywareꢀ Additionally, the last two
digits of the part number printed on the sticker on the TUC 1U1
microprocessor indicate the TUC firmware version, ie: 6200-0028-13ꢀ
The TUC operates the fan in the following modes:
90
UNT-IOM-6
Terminal Unit
Control (TUC)
Table 37ꢀ Valid TUC Addresses
DIP Switch Position
DIP Switch Position
Address 1 2 3 4 5 6 7 8
Address 1 2 3 4 5 6 7 8
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X X
X X
X
X
X
X
X
X
X X
X X
X X X
X X X
X
X
X
X
X
X
X
X
X
X
X X
X
X
X X
X X
X X
X X
X X
X
X
X X X
X X X
X X X X
X X X X
X X
X X
X X
X X
X X
X X
X X
X X
X X X
X X X
X X X
X X X
X
X
X
X
X
X
X
X
X
X
X X
X
X
X
X X
X
X
X
X
X
X X
X X
X X X
X X X
X
X
X
X
X X
X X
X X
X X
X
X
X X
X X X X
X X X X
X X X X X
X X X
X
X X X X
X X X X
X X X X X
X X X X X X
X
X X
X
UNT-IOM-6
91
Terminal Unit
Control (TUC)
TUC Sequence of Operation
· Occupied
· Unoccupied
· Tracer® with supply fan control
Occupied
In the occupied mode, the factory configures the TUC for continuous
occupied fan cycleꢀ With the fan control set to auto, the fan operates
at the required speed to meet the cooling or heating capacityꢀ
However, the fan will run at one set speed continuously if set in the
high, medium, or low positionꢀ
Unoccupied
In the unoccupied mode, the TUC cycles the fan between off and high
speed to satisfy the unoccupied setpointꢀ However, if the occupied
preheat damper position is closed and the room setpoint is 3° F
above (cool down) or 3° F below (warm-up) setpoint, the fan runs at
high speed when exiting the unoccupied mode to occupied modeꢀ
Also, if the occupied preheat damper position is configured as
closed, the fan will run in high speed any time the room temperature
falls 3° F or below room setpoint in occupied heating modeꢀ
Tracer® with supply fan control
If the unit is communicating with Tracer® and the supply fan control
programming point is configured for Tracer® (the factory configures as
local), then Tracer® will control the fan regardless of the fan mode
switch positionꢀ
All TUC lockouts (latching diagnostics) are manually reset whenever
the fan mode switch is set to the off position or when power is
restored to the unitꢀ The last diagnostic to occur is retained until the
unit power is disconnectedꢀ Refer to Trane publication, EMTX-IOP-1
TUC Installation Operation and Programming Guide, for specific
instructions regarding the procedure for running the TUCꢀ
Adjust the cooling setpoint by using either the setpoint adjustment
knob, resetting the TUC default values, or Tracer® downloaded valuesꢀ
The factory configures the occupied heat or cool setpoint source for
local modeꢀ The local mode allows the local setpoint knob to deter-
mine the cooling setpoint If using Tracer® to define the heat or cool
setpoint source, the TUC uses the Tracer® setpointsꢀ If Tracer® is not
communicating, the TUC will attempt to obtain the heating and
cooling setpoint from a local sourceꢀ If there is no input from a local
source, the TUC will resort to its default valuesꢀ
Cooling and
Heating Operation
Setpoint Control
The TUC limits the parameters of the cooling setpoint input (adjust-
able from either the setpoint knob or Tracer® ) to prevent excessively
92
UNT-IOM-6
Terminal Unit
Control (TUC)
high or low temperaturesꢀ In addition, the TUC calculates the heating
setpoint equal to the cooling setpoint minus an adjustable heating
offsetꢀ Furthermore, the heating setpoint cannot exceed a value less
than or equal to the cooling setpointꢀ The TUC is in the cooling mode
when the space temperature rises 1° F above the cooling setpointꢀ
The TUC is in the heating mode when the space temperature drops 1°
F below the heating setpointꢀ The unoccupied setpoints are typically
widened to account for night setback and are adjustable with either
Tracer® or EveryWareä softwareꢀ
Off Position
Fan Mode
Operation
On a stand-alone TUC with the fan mode switch in the off position, all
normal cooling and heating functions ceaseꢀ (eꢀgꢀ The fan does not
run, the fresh air damper option closes, and the unoccupied mode
disablesꢀ)
High, Medium, or Low Postion
With the fan mode switch in the high, medium, or low position; the
fresh air damper option and the control valve(s) operate to maintain
setpointꢀ
Auto Position
As the capacity requirement increases at low fan speed, the control
valve gradually opensꢀ The fan speed increases to medium after
reaching the low speed capacity switch pointꢀ This causes the control
valve to reposition to maintain capacity, gradually opening as demand
increasesꢀ The fan speed increases to high after reaching the medium
speed capacity switch pointꢀ This causes the control valve to reposi-
tion to maintain output capacity, gradually opening as demand
increasesꢀ As capacity decreases, the control valve closes until
reaching the fan switch pointꢀ After reaching the fan switch point, the
fan speed decreases to medium with the control valve repositioning to
maintain constant capacityꢀ As capacity decreases, the control valve
closes until reaching the fan switch pointꢀ After reaching the fan
switch point, the fan speed decreases to low with the control valve
repositioning to maintain constant capacityꢀ At low speed, the control
valve closes incrementally as demand decreasesꢀ
UNT-IOM-6
93
Terminal Unit
Control (TUC)
The entering water temperature sampling function allows water to
circulate in an attempt to sense water cold enough to provide coolingꢀ
The function uses a timer to permit the controller and the valve to fully
open while the water circulates for 3 minutesꢀ The fan continues to run
at the selected speedꢀ If the changeover sensor does not sense the
correct water temperature within this 3 minute cycle, the valve closes
and the entering water temperature sampling function will cease until
57 minutes elapseꢀ After this time lapse, the water circulates again
through the unit to determine if the entering water temperature indi-
cates a call for cooling or heatingꢀ
Entering Water
Temperature
Sampling Function
Note: The entering water temperature sampling function is for units
with 2-way valvesꢀ This function is not necessary for units with 3-way
valves since water flows continuously through this piping configura-
tionꢀ
Table 38ꢀ Unit Mode as Related to Water Temperature
Unit Type
EWT Sensor Required?
Coil Water Temperature
2-pipe changeover
Yes
· Can cool if:
space temp - EWT ³ 5 deg F
· Can heat if:
EWT - space temp ³ 5 deg F
· Can cool if:
space temp - EWT ³ 5 deg F
· Can heat if:
EWT - space temp ³ 5 deg F
4-pipe changeover
Yes
2-pipe heating only
2-pipe cooling only
4-pipe heat/cool
No
No
No
Hot water assumed
Cold water assumed
· Cold water assumed in main coil
· Hot water assumed in auxꢀ coil
The auxiliary electric heat option allows heating when the occupied
space requires heating but the unit still has chilled system water
flowing through itꢀ The electric heat is also sufficient for use as the
sole source of heat for the unitꢀ
2-Pipe with
Auxiliary Electric
Heat (Fan-coils)
The TUC utilizes a heating only output to energize electric heat if
hydronic heat is insufficient to meet the heating requirementsꢀ This
output responds to a demand for heat as long as the entering water
temperature is lower than 95° Fꢀ However, if the water temperature
reaches 95° F or higher, the electric heat lockout switch (on the
supply water pipe) disengages the electric heatꢀ Electric heat be-
comes available again when the entering water temperature falls to
65° F or lower (± 5° F)ꢀ
94
UNT-IOM-6
Terminal Unit
Control (TUC)
Note: The auxiliary electric heat option is not available with a four-pipe
fan-coil unitꢀ
Units with manual fresh air
dampers ship with the damper in
the closed position, which is
adjustable from zero to 100
percent in 25 percent incre-
mentsꢀ To adjust the position,
first remove the air filter to
Fresh Air Damper
Options
Manual
expose the damper stop screw
on the control panel endꢀ Relo-
Figure 30. Re-locate the damper
stop screw to adjust the damper
position. The factory positions
the stop screw in the 25% open
position.
cate the stop screw to the
appropriate positionꢀ Then loosen
the stop screw wingnut and
adjust the linkageꢀ See Figure
30ꢀ
Units with an auto 2-position fresh air damper ship with a stop screw
in the 25 percent reference positionꢀ The auto damper is adjustable to
open from zero to 50 percent in 25 percent incrementsꢀ To adjust the
damper position, remove the air filter to expose the damper stop
screw on the control panel endꢀ Then relocate the stop screw to the
appropriate positionꢀ See Figure 30ꢀ
Auto 2-Position
Note: The open position of the damper does not correspond to the
amount of fresh airꢀ It is the installer’s responsibility to ensure that
the building’s minimum fresh air requirements are met while taking
necessary precautions to protect the unit during freeze conditionsꢀ
The economizer damper option contains a modulating, 3-wire floating
point actuator and a damper assemblyꢀ The factory sets the damper
at a minimum 25 percent open position by configuring the TUCꢀ This
setting is adjustable and can be changed in the field with EveryWareä
software or Tracerâꢀ The minimum open position is adjustable from
zero to 100 percent in one percent incrementsꢀ
Economizer
The economizer fresh air damper is controlled to the minimum
position, which the factory configuresꢀ During the occupied mode,
economizing is enabled and the fresh air temperature is measured
while economizingꢀ
Economizing is enabled within the TUC configuration based on an
editable temperature differential between the fresh air temperature and
the zone temperatureꢀ The unit will go into economizing mode when
UNT-IOM-6
95
Terminal Unit
Control (TUC)
the outside air temperature falls to 10° F or more below the zone
temperatureꢀ The TUC will control the damper to a position to produce
optimal cooling during economizingꢀ If power is interrupted or the TUC
is turned off, the damper will spring back to the closed positionꢀ
If the occupied preheat damper position is configured as closed (the
factory configures as open), the fresh air damper remains closed
during the transition from unoccupied mode to occupied mode until
the zone temperature is within 2° F of the heating setpoint (warm-up
sequence), or cooling setpoint (cool-down sequence)ꢀ During the
warm-up sequence, the damper fully closes, the fan operates on high
speed, and the heating valve drives fully open to until the zone
temperature approaches the occupied heating setpointꢀ If the zone
temperature falls 3° F or more below the heating setpoint during the
occupied mode, the TUC reinitiates the warm-up sequence until the
zone temperature is within 2° F of the heating setpointꢀ
If during the occupied heating mode, the TUC determines that no
heating capacity is present and the zone temperature drops 3° F
below the heating setpoint, the TUC closes the fresh air damper
regardless of the occupied preheat damper positionꢀ The cool-down
sequence has a maximum duration of one hour and cannot be
reinitiated once the unit is in occupied modeꢀ
All units ship from the factory with the damper in the closed positionꢀ
Note: The open position of the damper does not correspond to the
amount of fresh air provided to the unitꢀ It is the installer’s responsi-
bility to ensure that the building’s minimum fresh air requirements are
met while taking the necessary freeze conditon precautions to
protect the unitꢀ
96
UNT-IOM-6
Terminal Unit
Control (TUC)
The low temperature detection
option protects the unit from
BIP4: Low
Temperature
Detection Option
freezing conditions by using a
capillary line in the coil fins to
detect freezing conditionsꢀ The
TUC uses the low temperature
sensor with a normally open
valveꢀ When the sensor detects
temperatures below 36° F, a binary
input turns the fan off, closes the
fresh air damper, disables the
electric heat, and opens the con-
trol valveꢀ This creates a shutdown
Figure 31. The low temperature
sensor is a capillary tube
inserted into the coil to detect
freezing conditions.
latching diagnostic that requires a reset to resume normal operationꢀ
However, normal operation cannot resume until the water temperature
rises to 44° Fꢀ See Figure 31ꢀLow temperature detection is active
even when the unit is off, but the TUC must remain powered for it to
be functionalꢀ
The factory configures the 24V dry contact input as normally closed
to indicate alarmꢀ However, it also can be normally open
if using the correct switchꢀ
Note: While the low temperature detection sensor can help minimize
the risk of coil freeze-up, it cannot prevent this from occurring in all
circumstancesꢀ The user is responsible to adequately protect the unit
from freeze conditionsꢀ
Note: The capillary line of the low temperature detection sensor is in
the section of the hydronic coil above the fan, nearest the control
panel boxꢀ Locate the outside air wall box or ductwork so fresh air
has a direct path into the fanꢀ This allows the sensor to detect an
accurate fresh air temperature and proper operation of a dual fan unitꢀ
Failure to do this could cause the low temperature detection sensor to
incorrectly detect a potential freezing coilꢀ
BIP3: Condensate
Overflow
Detection Device
The condensate overflow detection device protects the unit from
condensate water overflowꢀ The switch is a float-type device located in
the fan-coil unit’s auxiliary drain panꢀ See the “Condensate Overflow
Switch” section and Figures 12 and 13 on page 26ꢀ
When there is a danger of condensate water overflow from the auxil-
iary pan, the float rises with the water level in the panꢀ When the float
rises to over 50 percent of its travel, the control valve closesꢀ Also, a
binary input causes the fan to turn off, the fresh air damper to close,
UNT-IOM-6
97
Terminal Unit
Control (TUC)
and the electric heat to disableꢀ This creates an immediate shutdown
latching diagnostic, which requires a manual or Tracerâ reset to
resume normal operationꢀ
However, normal operation cannot resume until the water level
recedes to an acceptable levelꢀ The switch will close after the water
level recedes, and the active temperature control of the unit will
resume by an automatic resetꢀ Since both the condensate overflow
detection and occupied/unoccupied status occupy BIP3 on the TUC
board, only one option can be in useꢀ The factory configures the 24V
dry contact input as normally closed to indicate an alarmꢀ However, it
also can be normally open if using the correct switchꢀ
The smoke input is a binary input on the TUC that is used with a
smoke detector switch (installer supplied) to signal an alarmꢀ Config-
ure the input to either send an alarm to Tracer® or as a shutdown
latching diagnosticꢀ If the input is configured as a shutdown latching
diagnostic, the TUC closes the control valve(s), shuts the fan off,
closes the fresh air damper, and disables electric heatꢀ
BIP4: Smoke Input
If the input is configured to send an alarm, Tracer will issue a system
wide shutdown for the buildingꢀ The unit will continue to run, and no
diagnostic will register within the TUCꢀ The factory configures the
24V dry contact input as normally closedꢀ However, it can also be
normally open if using the correct switchꢀ
The unit can operate in the occupied/unoccupied mode when a
binary signal is input from an external source such as a time clock or
Tracer® ꢀ Reference the “TUC Fan Mode Operation” section on page
65 for the sequence of operationsꢀ This option is only available if the
condensate overflow input is not in use (if not using Tracer®), since
both inputs occupy the same point on the TUC boardꢀ The factory
configures the 24V dry contact input as normally closedꢀ However, it
can also be normally open if using the correct switchꢀ A closed
signal indicates occupied modeꢀ
BIP3: Occupied/
Unoccupied Mode
The external interlock input allows the unit to be remotely stopped
when a binary signal is input to the TUC from an external source or
from Tracer®ꢀ Since both external interlock and condensate overflow
input to the same point (if not using Tracer®) on the TUC board, only
one input can be in useꢀ The factory configures the 24V dry contact
input as normally closed, but it can also be open if using the correct
switchꢀ
BIP1: External
Interlock
98
UNT-IOM-6
Terminal Unit
Control (TUC)
The motion detection input when used with a motion detection switch
(installer supplied) detects the absence of motion in the space during
the occupied modeꢀ If no motion is detected, the TUC controls the
space to alternate heating and cooling setpoints while also controling
the economizer damper option to the minimum positionꢀ The factory
configures the 24V dry contact input as normally closedꢀ However, it
can also be normally open if using the correct switchꢀ A closed signal
indicates alarmꢀ
BIP2: Motion
Detection
The autocycle test is an operating mode that activates the TUC
outputs in a defined series of stepsꢀ This function allows the techni-
cian to to manually exercise each TUC output by sequentially
stepping through the 16 stages of the autocycle test
Autocycle Test
Note: Do not leave unit unattended while in test mode because the
unit safety shutdowns are not functionalꢀ
Note: During the autocycle test, the TUC ignores all unit safety
diagnosticsꢀ Take precautions to ensure the hydronic coil is not
subject to freezing conditionsꢀ
CAUTION: If the TUC is left in the autocycle test
mode, it will automatically return to normal unit opera-
tion after 60 minutes.
!
To place the TUC in the autocycle test mode, perform the following
stepsꢀ Refer to Table 23 onpge 72 for details on the stagingꢀ
1ꢀ Read and record the initial TUC addressꢀ
2ꢀ Set the TUC DIP switch #7 to ON (address = 2)ꢀ All other switches
should be offꢀ
3ꢀ To automatically cycle through the stages, short and hold the TUC
test input (short J11 and J12 together)ꢀ Continue holding the test
input and the unit will cycle to each subsequent stage every 30
secondsꢀ
4ꢀ To manually step between stages, momentarily short the test input
to advance to the next test stageꢀ
5ꢀ When the autocycle test is complete, return the DIP switches to
the initial positions recorded in step 1ꢀ Short the test inputs to set the
address in the TUC EEPROMꢀ
UNT-IOM-6
99
Terminal Unit
Control (TUC)
Table 39ꢀ Autocycle Test Staging
Stage LEDs (1) Fan-Coil Output Exercised
1
2
3
4
0
1
2
3
Off
l
Fan low speed
Fan medium speed
Fan high speed
Economizer/damper
Cooling valve
Heating valve
Electric heat stage 1
Electric heat stage 2
Not used
l
l l
4 ¡ l
5 ¡ l ¡ l
6 ¡ l l ¡
7 ¡ l l l
8 l ¡ ¡ ¡
9 l ¡ ¡ l
10 l ¡ l ¡
11 l ¡ l l
12 l l ¡ ¡
13 l l ¡ l
Reheat
Not used
Not used
Not used
14 l l l ¡
15
Not used
Not used
(1) l= the LED is illuminated
¡= the LED is off
100
UNT-IOM-6
Terminal Unit
Control (TUC)
Reading Diagnostics
Use the TUC human interface to read the current unit diagnosticꢀ If no
diagnostics are present, the last diagnostic appearsꢀ
Perform the following stepsꢀ Refer to Table 23 on page 72 for staging
detailsꢀ
1ꢀ Read and record the initial TUC addressꢀ
2ꢀ Set the TUC DIP switch #5 to ON (address = 8)ꢀ
3ꢀ Short and hold the test inputꢀ
4ꢀ The LEDs will blink to define a diagnostic codeꢀ The diagnostic
information will be displayed in a series of three blink sequencesꢀ
Sequence 1: When the test input is shorted continuously,
all LEDs go off for one secondꢀ
Sequence 2: LED #5 will light to indicate that sequence 2 is
currently being displayedꢀ LEDs one through
four will display the first part of the diagnostic
codeꢀ
Sequence 3: LED #6 will light to indicate that sequence 3 is
currently being displayedꢀ LEDs one through
four will display the second part of the
diagnostic codeꢀ
5ꢀ Refer to Table 24 on page 74 to interpret the blink sequences’
corresponding diagnostic codeꢀ
6ꢀ Read and record the current diagnosticꢀ Then return the DIP
switches to the initial positions recorded in step 1ꢀ Short the test
inputs to set the address in the TUC EEPROMꢀ
Example: Diagnostic blink sequences for condensate overflow (8B)
Sequence 1
Sequence 2
Sequence 3
1
2
3
4
1
2
3
4
1
2
3
4
¡ ¡ ¡ ¡
¡ ¡
l ¡ ¡ ¡
l ¡
l ¡ l l
¡ l
¡
¡
¡
5
6
7
5
6
7
5
6
7
UNT-IOM-6
101
Terminal Unit
Control (TUC)
Table 40ꢀ Blink Sequence Corresponding Diagnostic Codes
Sequence 1 Sequence 2 Sequence 3
1
2
3
4
1
2
3
4
1
2
3
4
Code
Diagnostic
Latch
None
Power failure
None
None
Controller failure
None
¡ ¡ ¡ ¡ ¡ ¡ ¡ ¡ ¡ ¡ ¡ ¡
¡ ¡ ¡ ¡ l ¡ ¡ ¡ l ¡ l l
¡ ¡ ¡ ¡ l ¡ ¡ l l ¡ l l
00
8B
9B
None
N/A
Yes
No
Condensate overflow
Leaving water temp
sensor 1 failure
Zone and supply temp
sensor failure
¡ ¡ ¡ ¡ l ¡ l ¡ ¡ ¡ ¡ ¡
A0
No
¡ ¡ ¡ ¡ l l ¡ ¡ l ¡ ¡ ¡
¡ ¡ ¡ ¡ l l ¡ ¡ l ¡ l l
¡ ¡ ¡ ¡ l l ¡ ¡ l l l l
C8
CB
CF
High EWT
No
Low EWT
No
Low tempꢀ detectꢀ or
condensate overflow
Low discharge air temp
Yes
¡ ¡ ¡ ¡ l l ¡ l ¡ ¡ l l
¡ ¡ ¡ ¡ l l ¡ l ¡ l ¡ ¡
¡ ¡ ¡ ¡ l l ¡ l ¡ l ¡ l
¡ ¡ ¡ ¡ l l ¡ l l l ¡ l
¡ ¡ ¡ ¡ l l l l l ¡ ¡ ¡
¡ ¡ ¡ ¡ l l l l l l l ¡
D3
D4
D5
DD
F8
FE
Yes
Smoke alarm
Yes/No
Yes/No
No
High dischg air temp
Low fresh air temp
Bad configuration
Return air high limit
No
Yes
Reading the
Operating
Use the human interface to read the unit operating machine stateꢀ
Machine State
1ꢀ Read and record the initial TUC addressꢀ
2ꢀ Set the TUC DIP switch #5 and #8 to ON (address = 9)ꢀ The
remaining switches will be offꢀ
3ꢀ Short and hold the test inputꢀ
4ꢀ The LEDs will blink to define an operating machine stateꢀ The
operating machine state information will be displayed in a series
of three blink sequencesꢀ
Sequence 1: When the test input is shorted continuously all
LEDs go off for one secondꢀ
Sequence 2: LED #5 will light to indicate that sequence 2 is
currently being displayedꢀ LEDs one through four will display the
first part of the operating machine stateꢀ
Sequence 3: LED #6 will light to indicate that sequence 3 is
currently being displayedꢀ LEDs one through four will display the
second part of the operating machine stateꢀ
5ꢀ Reference Table 25 on page 75 to interpret the operating machine
state derived from the blink sequencesꢀ
102
UNT-IOM-6
Terminal Unit
Control (TUC)
6ꢀ Read and record the operating machine stateꢀ Return the DIP
switches to the initial positions recorded in step 1ꢀ Short the test
inputs to set the address in the TUC EEPROMꢀ
Example: Operating Machine State for Standby Mode
Sequence 1
Sequence 2
Sequence 3
1
2
3
4
1
2
3
4
1
2
3
4
¡ ¡ ¡ ¡
¡ ¡
¡ ¡ ¡ l
l ¡
¡ ¡ l ¡
¡ l ¡
¡
¡
5
6
7
5
6
7
5
6
7
Example: Operating control mode for purge mode
Table 41ꢀ Operating Machine State LED Sequences and Codes
Sequence 1 Sequence 2 Sequence 3
1
2
3
4
1
2
3
4
1
2
3
4
Code
Machine State
¡ ¡ ¡ ¡ ¡ ¡ ¡ ¡ ¡ ¡ ¡ ¡
¡ ¡ ¡ ¡ ¡ ¡ ¡ ¡ ¡ ¡ l
¡ ¡ ¡ ¡ ¡ ¡ ¡ ¡ ¡ l ¡ ¡
¡ ¡ ¡ ¡ ¡ ¡ ¡ ¡ ¡ l l ¡
¡ ¡ ¡ ¡ ¡ ¡ ¡ ¡ l ¡ ¡ ¡
¡ ¡ ¡ ¡ ¡ ¡ ¡ ¡ l ¡ l ¡
¡ ¡ ¡ ¡ ¡ ¡ ¡ ¡ l l ¡ ¡
¡ ¡ ¡ ¡ ¡ ¡ ¡ ¡ l l l ¡
¡ ¡ ¡ ¡ ¡ ¡ ¡ l ¡ ¡ ¡ ¡
¡ ¡ ¡ ¡ ¡ ¡ ¡ l ¡ ¡ ¡ ¡
¡ ¡ ¡ ¡ ¡ ¡ ¡ l ¡ l ¡ ¡
¡ ¡ ¡ ¡ ¡ ¡ ¡ l ¡ l l ¡
00
2
Manufacturing Test
Bad Configuration
Auto Cycle Test
Disable
4
6
8
Stop
10
12
14
16
18
20
22
Calibration
Latching Diagnostic
Freeze Shutdown
Soft Reset
Standby
Cooling
Heating
UNT-IOM-6
103
Terminal Unit
Control (TUC)
Using the human interface, read the operating control modeꢀ
Reading the
Operating Control
Mode
1ꢀ Read and record the initial TUC addressꢀ
2ꢀ Set the TUC DIP switch #5 and #7 to ON (address = 10)ꢀ The
remaining switches will be offꢀ
3ꢀ Short and hold the test inputꢀ
4ꢀ The LEDs will blink to define an operating control modeꢀ The
operating control mode information will be displayed in a series of
three blink sequencesꢀ
Sequence 1: With the test input shorted continuously, all
LEDs go off for one secondꢀ
Sequence 2: LED #5 will light to indicate that sequence 2 is
currently displayedꢀ LEDs one through four
will display the first part of the operating control
modeꢀ
Sequence 3: LED #6 will light to indicate that sequence 3 is
currently being displayedꢀ LEDs one through four
will display the second part of the operating control
modeꢀ
5ꢀ Refer to Table 26 on page 77 to interpret the operating control
mode derived from the blink sequencesꢀ
6ꢀ After reading and recording the operating control mode, return the
DIP switches to the positions recorded in step 1ꢀ Short the test
inputs to set the address in the TUC EEPROMꢀ
104
UNT-IOM-6
Terminal Unit
Control (TUC)
Sequence 1
Sequence 1
Sequence 2
Sequence 2
Sequence 3
Sequence 3
1
2
3
4
1
2
3
4
1
2
3
4
¡ ¡ ¡ ¡
¡ ¡
¡ ¡ ¡ ¡
l ¡
¡ ¡ l ¡
¡ l ¡
¡
¡
5
6
7
5
6
7
5
6
7
Table 42ꢀ Operating Control Mode LED Sequences and Codes
Sequence 1 Sequence 2 Sequence 3
1
2
3
4
1
2
3
4
1
2
3
4
Code Control
Mode
Definition
¡ ¡ ¡ ¡ ¡ ¡ ¡ ¡ ¡ ¡ ¡ ¡
0
Stop
Diagnostic, user switch,
Tracer® command or interlock
has stopped the unit
¡ ¡ ¡ ¡ ¡ ¡ ¡ ¡ ¡ ¡ l ¡
2
Purge
Incorrect entering water tempꢀ
The TUC cannot meet the
demandꢀ There is no other
capacity availableꢀ
¡ ¡ ¡ ¡ ¡ ¡ ¡ ¡ ¡ l ¡ ¡
¡ ¡ ¡ ¡ ¡ ¡ ¡ ¡ l ¡ ¡ ¡
4
8
Tracer®
Override
The TUC received a Tracer®
verrideꢀ Follow Tracer® output
commandsꢀ
Precool
Precool
Precool
Unoccupied cooling with
economizer, or water;
occupied cooling feasibility
checkꢀ
Unoccupied cooling with
EWT economizer while purging
for sampling cold waterꢀ
¡ ¡ ¡ ¡ ¡ ¡ ¡ ¡ l ¡ l ¡ 10
¡ ¡ ¡ ¡ ¡ ¡ ¡ ¡ l l ¡ ¡ 12
Unoccupied cooling with 100%
cool economizer with water or
compressor augmentationꢀ
¡ ¡ ¡ ¡ ¡ ¡ ¡ ¡ l l l ¡ 14
Econo-
mizer
Occupied cooling with econo-
mizer
¡ ¡ ¡ ¡ ¡ ¡ ¡ l ¡ ¡ ¡ ¡ 16
Econo-
mizer
EWT
Occupied cooling with econo-
mizer while sampling for cold
waterꢀ
sampling
UNT-IOM-6
105
Terminal Unit
Control (TUC)
Table 42—Continuedꢀ Operating Control Mode LED Sequences and Codes
Sequence 1 Sequence 2 Sequence 3
2 3
1
2
3
4
1
2
3
4
1
4
Code Control
Mode
Definition
¡ ¡ ¡
¡
¡ ¡ ¡ l
¡ ¡ l ¡
18
Cool
Occupied cooling with the
water coil
¡¡¡ ¡ ¡¡¡l ¡l¡¡
¡¡¡ ¡ ¡¡¡l ¡ll¡
¡¡¡ ¡ ¡¡¡l l¡¡¡
20
Cool
econo-
mize
Occupied cooling with water
and 100% economizer
22
24
Preheat
Unoccupied heating with hot
water (main or auxiliary), or
electric heatꢀ
Preheat
EWT
Two-pipe only, unoccupied
heating with electric heat
sampling while sampling for hot waterꢀ
¡¡¡ ¡ ¡¡¡l l¡l¡
26
Preheat
electric
heat
Unoccupied heating with
100% hot water (main or
auxiliary) or with electric
heat augmentationꢀ Or,
unoccupied heating with
100% main coil hot water
with auxiliary coil hot water
augmentationꢀ
¡¡¡ ¡ ¡¡¡l ll¡¡
¡¡¡ ¡ ¡¡¡l lll¡
¡¡¡ ¡ ¡¡l¡ ¡¡¡¡
28
30
32
Heat
Occupied heating with
hot water (main or auxiliary
coil)
Occupied heating with
electric heat
Electric
heat
Heat
electric
heat
Electric heat available:
occupied heating with 100%
hot water (main or auxiliary)
¡¡¡ ¡ ¡¡l¡ ¡¡l¡
34
Electric
heat
EWT
Two-pipe only, occupied
heating with electric heat
while purging for hot waterꢀ
sampling
Electric heat not available: Occupied heating with 100% main coil hot water with auxiliary coil hot water
augmentationꢀ
106
UNT-IOM-6
Terminal Unit
Control (TUC)
Diagnostics
Table 43ꢀ TUC Controller Diagnostics
Diagnostic
Latching?
Fan
Valves
Electꢀ Heat
Damper
Dirty filter
Yes
No Action
No Action
No Action
Off
No Action
Condensate
overflow
Yes
Off
Closed
Closed
Supply fan
failure (if
Yes
Off
Closed
Off
Closed
configured as
alarm = yes)
Supply fan
failure (if
configured as
alarm = no)
Yes
Yes
No Action
Off
No Action
Open
No Action
Off
No Action
Closed
Low coil
entering air
temp
Notes:
1ꢀ
2ꢀ
Use a normally open hot water valve with the low coil entering air temperature sensorꢀ
Use a normally closed chilled water valve with the condensate overflow sensorꢀ
There are five ways in which diagnostics are reset:
Resetting
Diagnostics
1ꢀ Using the zone sensor
2ꢀ Using Everyware™, Trane’s TUC service tool
3ꢀ By cycling power to the TUC
4ꢀ Through Tracer 100iä or 100Lä
5ꢀ Through Tracer Summit®
Using the zone sensor’s fan mode switch to reset diagnostics, slide
the fan mode switch to the off positionꢀ Then return the switch back to
any position except offꢀ
Using the Zone Sensor
Connect to the communications terminal with a laptop computer
loaded with Everywareä softwareꢀ Log on and reset the diagnostics
from the diagnostic page of the TUC configuration screensꢀ To view
the diagnostics prior to resetting, press the ENTER key while in the
status section of the service summary screensꢀ
Using
Everyware™Software
UNT-IOM-6
107
Terminal Unit
Control (TUC)
Remove the 24 VAC power from the board and then reapply it to
cycle the unit through a power-up sequenceꢀ By default, the controller
attempts to reset all diagnostics at power-upꢀ
Cycling Power to the
TUC
Using Tracer 100i™ or
100L™
The TUC editor’s reset failure point allows the user to reset controller
diagnosticsꢀ Also, Tracer® versions 14ꢀ4 and higher provide a “+
enter” option from the TUC service summary screens that allow
latching diagnostic resetꢀ
When using a Tracer Summit® system, reset the unit diagnostics with
the reset diagnostics button on the TUC editor screenꢀ
Using Tracer Summit®
The unit’s operating machine state is in standby when one of the
following conditions occurs:
Unit Mode Listed
as Standby
1ꢀ Tracer® override is presentꢀ
2ꢀ During the power-up sequence or any time when the TUC is
calibrating its end devicesꢀ
3ꢀ When the TUC is in the unoccupied mode and there is no call for
heating or coolingꢀ
4ꢀ In the occupied mode when the desired capacity is unavailableꢀ
ie: the TUC requests a 2-pipe unit to heat, yet no hot water or electric
heat is availableꢀ The TUC will list the unit as being in standby modeꢀ
108
UNT-IOM-6
Terminal Unit
Control (TUC)
Troubleshooting
More detailed information about programming and operating the TUC
board can be found in Trane publication, EMTX-IOP-1 TUC Installa-
tion Operation and Programming Guideꢀ
Table 44ꢀ TUC Does Not Communicate
Probable Cause
Explanation
TUC is not addressed correctly
Verify the ICS address according to Table 21 on page 63ꢀ Each TUC
on the link requires a unique address in the range of 33 to 96ꢀ Set or
modify the DIP switches, then short the TUC test input momentarilyꢀ
Incorrect comm 4 wiring
Defective TUC board
Verify that the link is twisted pair Trane part # 400-20-28 or equiva-
lentꢀ TUC (comm 4) wiring is polarity sensitive throughout the com-
munication linkꢀ If possible, isolate the TUC from the rest of the ICS
link to determine if the problem exists in the comm wiring or in the
TUC boardꢀ
If the previous solutions do not fix the problem, it may be necessary
to replace the TUC boardꢀ
Table 45ꢀ Fan Outputs not Energizing
Probable Cause
Explanation
Random start enabled
When enabled, the random start feature delays the unit start-up for
3 to 32 seconds (configurable) after power-upꢀ
Power-up control wait
Cycling fan operation
Unoccupied operation
When enabled, the power-up control wait feature delays the TUC
startup for two minutes after power-upꢀ This delay allows the
Tracer® system ample time to communicate its fan control requestꢀ
When configured to cycle with capacity, the unit fan cycles off when
there is no call for heating or coolingꢀ The heating/cooling sources
cycle on or off periodically with the unit fan to match the capacity
according to pulse-width-modulation (PWM) logicꢀ
The fan cycles with capacity when the unit is in unoccupied modeꢀ
This occurs even if the unit is configured for continuous fan opera-
tionꢀ While unoccupied, the fan cycles on or off with heating/
cooling to match the capacity according to pulse-width-modulation
(PWM) logicꢀ The TUC can be placed in unoccupied mode either
through a Tracer® system or through BIP3 if it has been configured
as occupied/unoccupiedꢀ
Latching diagnostic present
Unit disabled
A specific list of diagnostics effects fan operationꢀ For more informa-
tion, see the “Diagnostics” section on page 73ꢀ Latching diagnostics
require a manual reset to restore normal unit operationꢀ
The Tracer® system can disable the unit via a shutdown input or
BIP1 can be configured as external interlockꢀ
Local fan switch: off
Using the local fan mode switch to determine fan operation, the
“off” position on the switch controls the unit fan to offꢀ
UNT-IOM-6
109
Terminal Unit
Control (TUC)
Table 45—Continuedꢀ Fan Outputs not Energizing
Probable Cause
Explanation
No power to the TUC
The TUC requires 24 VAC power for the unit to
operate properlyꢀ
Autocycle test
Wiring
The controller includes an auto cycle test sequence that verifies
analog and binary output operation and associated output wiringꢀ
However, based on the current stage in the test sequence, supply
fan may be offꢀ Refer to the “Autocycle Test” section on page 71ꢀ
The wiring between the controller outputs and the fan relays and
contacts must be present and correct for normal fan operationꢀ
Refer to the typical unit wiring diagrams on pages 105-106ꢀ
Table 46ꢀ Valves Closed
Probable Cause
Explanation
Normal operation
unit disabled
The valves open and close to meet unit capacity requirementsꢀ
· The TUC may be disabled via the shutdown mode on a Tracer®
system or if BIP1 is configured as external interlockꢀ
· During the stop modes, the valves remain closed unless freeze
avoidance is enabled and the fresh air temperature falls
below the freeze avoidance setpoint (configurable)ꢀ
· If the fresh air temperature falls below the freeze avoidance
setpoint, the valves openꢀ The TUC enables freeze avoidance
whenever the freeze avoidance setpoint is not zeroꢀ
Override present
The valves may be overridden to the closed position by either the
Tracer® system or by Everyware™ softwareꢀ Whenever any override
is active, the TUC drives the valves closed unless they are concur-
rently overridden openꢀ
Latching diagnostic presen
Autocycle test
A specific list of diagnostics effects valve operationꢀ For more
information, see the “Diagnostics” section on page 73ꢀ Latching
diagnostics require a manual reset to restore normal unit operationꢀ
The controller includes an autocycle test sequence that verifies
analog and binary output operation and associated output wiringꢀ
However, based on the current stage in the test sequence, the
valve(s) may be closedꢀ Refer to the “Human Interface” section on
page 62ꢀ
Maximum heating/cooling
capacity of zero
The Tracer® may limit the maximum heating/cooling capacity of the
TUC from zero to 100%ꢀ When the maximum cooling capacity is
zero, the cooling valve remains closedꢀ When the maximum heating
capacity is zero, the heating valve remains closedꢀ
110
UNT-IOM-6
Terminal Unit
Control (TUC)
Table 46—Continuedꢀ Valves Closed
Probable Cause
Explanation
Unit Configuration
The TUC cannot control any valve outputs if the unit is configured
for no valvesꢀAlso, if the valve type is incorrectly configured (on/off,
modulating analog, or 3-wire floating point), the valve(s) may not
operate properlyꢀ
No Power to the TUC
Wiring
The TUC requires a 24 VAC power for the unit to operate properlyꢀ
The wiring between the controller outputs and the valve(s) must be
present and correct for normal valve operationꢀ Refer to the typical
unit wiring diagrams on pages 105-106ꢀ
Table 47ꢀ Valves Open
Probable Cause
Explanation
Normal Operation
The valves open and close to meet unit capacity requirementsꢀ
Override Present
The valves may be overridden to the open position by either the
Tracer® system or by Everyware™ softwareꢀ Whenever any
override is active, the TUC drives the valves closed unless they are
concurrently overridden openꢀ
Autocycle Test
The controller includes an autocycle test sequence that verifies
analog and binary output operation and associated output wiringꢀ
However, based on the current stage in the test sequence, the
valve(s) may be openꢀ Refer to the “Autocycle Test” section on
page 71ꢀ
Unit Configuration
The TUC cannot control any valve outputs if the unit is configured
for no valvesꢀAlso, if the valve type is incorrectly configured (on/off,
modulating analog, or 3-wire floating point), the valve(s) may not
operate properlyꢀ
FreezeAvoidance
Wiring
When freeze avoidance is enabled (active only during stop modes)
the TUC controls the valve(s) open whenever the fresh air tempera-
ture is less than the freeze avoidance setpoint (configurable)ꢀ If the
freeze avoidance setpoint is zero, this feature is disabledꢀ
The wiring between the controller outputs and the valve(s) must be
present and correct for normal valve operationꢀ Refer to the typical
unit wiring diagrams on pages 105-106ꢀ
UNT-IOM-6
111
Terminal Unit
Control (TUC)
Table 48ꢀ Electric Heat Not Operating
Probable Cause
Explanation
Normal Operation
The controller cycles electric heat on and off to meet the unit
capacity requirementsꢀ
Unit Disabled
The TUC may be disabled via the shutdown mode on a Tracer®
system or if BIP1 is configured as external interlockꢀ
Electric Heat Control: Disable
The electric heat may be disabled with the Tracer® systemꢀ To
enable the electric heat, the TUC electric heat control must be set
to the auto postionꢀ
Maximum heating capacity of zero The Tracer® may limit the maximum heating/cooling capacity of the
TUC from zero to 100%ꢀ When the maximum heating capacity is
zero, the electric heat is disabledꢀ
Latching Diagnostic Present
A specific list of diagnostics affects electric heat operationꢀ For
more information, see the “Diagnostics” section on page 73ꢀ
Latching diagnostics require a manual reset to restore normal unit
operationꢀ
Autocycle Test
The controller includes an autocycle test sequence that verifies
analog and binary output operation and associated output wiringꢀ
However, based on the current stage in the test sequence, the
electric heat may be disabledꢀ Refer to the “Autocycle Test”
section on page 71ꢀ
Unit Configuration
The TUC cannot control the electric heat output if the unit is config-
ured for no electric heatꢀ Also, if the electric heat type is incorrectly
configured (1 or 2 stage), the electric heat may not operate prop-
erlyꢀ
No Power to the TUC
Wiring
The TUC requires 24 VAC power for the unit to operate properlyꢀ
The wiring between the controller outputs and the electric heat must
be present and correct for normal electric heat operationꢀ Refer to
the typical unit wiring diagrams on pages 105-106ꢀ
112
UNT-IOM-6
Terminal Unit
Control (TUC)
Table 49ꢀ Fresh Air Damper Closed
Probable Cause
Explanation
Normal Operation
· The two-position fresh air damper opens under normal unit operation
during occupied mode and closes during unoccupied modeꢀ
· Modulating analog and 3-wire floating point economizers open to
the minimum position (configurable) when the unit is occupied and
modulate to meet unit capacity requirementsꢀ
· If the minimum damper position is zero, the damper may close for
extended periodsꢀ During the unoccupied mode, the normal fresh
air damper position is closedꢀ
Unit Disabled
·Tracer® may disable via the shutdown mode on a system or if
BIP1 is configured as external interlockꢀ
· During the stop modes, the fresh air damper remains closedꢀ
Override Present
The fresh air damper may be overridden closed by either the
Tracer® system or by Everyware™ softwareꢀ Whenever any override
is active, the TUC drives the fresh air damper closed, unless the
damper is concurrently overridden openꢀ
Latching Diagnostic Present
Autocycle Test
Specific diagnostics affect damper operationꢀ For more information,
see the “Diagnostics” section on page 73ꢀ Latching diagnostics
require a manual reset to restore normal unit operationꢀ
The controller includes an autocycle test sequence that verifies
analog and binary output operation and associated output
wiringꢀ However, the current test sequence stage may require the
damper to closeꢀ Refer to the “Autocycle Test” section on page 71ꢀ
Unit Configuration
Warm-Up Mode
The TUC cannot control fresh air damper outputs if the unit is config-
ured for no fresh air damperꢀ Also, if the fresh air damper is incor-
rectly configured (on/off, modulating analog, or 3-wire floating point),
it may not operate properlyꢀ
When the occupied preheat damper position is closed, the unit
closes the fresh air damper whenever the zone temperature falls
3° F or more below the active heating setpointꢀ The fresh air damper
remains closed until the zone temperature is within 2° F of the
active heating setpointꢀ
Local Fan Switch: Off
No Power to the TUC
Using the local fan mode switch to determine the fan operation, the
off position will control the unit fan off close the fresh air damperꢀ
The TUC requires 24 VAC power for proper operationꢀ Wiring
The wiring between the controller outputs and the fresh air damper
must be present and correct for normal damper operationꢀ Refer to
typical unit wiring diagrams on pages 105-106ꢀ
Motion Detection Feature
If motion detection is enabled and no motion is detected in the
space (by a motion sensor wired to BIP2), the TUC will
apply an alternate fresh air minimum damper positionꢀ
UNT-IOM-6
113
Terminal Unit
Control (TUC)
Table 50ꢀ Fresh Air Damper Open
Probable Cause
Explanation
Normal Operation
· The two-position fresh air damper opens under normal unit opera
tion during occupied mode and closes during unoccupied modeꢀ
· Modulating analog and 3-wire floating point economizers open to
the minimum position (configurable) when the unit is occupied and
modulate to meet unit capacity requirementsꢀ
· If the minimum damper position is zero, the damper may close
for extended periodsꢀ During the unoccupied mode, the normal
fresh air damper position is closedꢀ
Override Present
Autocycle Test
The fresh air damper may be overridden open by either the Tracer®
system or Everyware™ softwareꢀ Whenever any override is active,
the TUC drives the fresh air damper closed, unless the damper is
concurrently overridden openꢀ
The controller includes an autocycle test sequence that verifies
analog and binary output operation and associated output wiringꢀ
However, the current test stage sequence may require the fresh
air damper may be openꢀ Refer to the “Autocycle Test” section on
page 71ꢀ
Unit Configuration
Wiring
The TUC cannot control fresh air damper outputs if the unit is
configured for no fresh air damperꢀ Also, if the fresh air damper type
is incorrectly configured (on/off, modulating analog, or 3-wire
floating point), it may not operate properlyꢀ
The wiring between the controller outputs and the fresh air damper
must be present and correct for normal damper operationꢀ Refer to
the typical unit wiring diagrams on pages 105-106ꢀ
Table 51ꢀ Zone Temperature Too Warm
Probable Cause
Explanation
Active heating/cooling
setpoints
Verify that the active heating/cooling setpoints are reasonableꢀ It is
possible for either the zone sensor or for the Tracer® system to
send heating and cooling setpoints to the TUCꢀ Use the Tracer®
system or Everyware™ software to determine which source is
sending the setpointꢀ
Wiring
Verify the wiring of all end devices, such as valves and dampersꢀ
Use the manual overrides or the autocycle test to verify the end
device operationꢀ
Manual heat mode
sent by Tracer®
If the Tracer® system places the TUC in manual heat mode, the TUC
cannot switch to cool mode and therefore cannot provide cooling to
the zoneꢀ
Zone sensor location
Locate the zone sensor in an area where the temperature is repre-
sentative of the average zone temperatureꢀ
114
UNT-IOM-6
Table 52ꢀ Zone Temperature Too Cool
Probable Cause
Explanation
Active Heating/Cooling Setpoints Verify that the active heating/cooling setpoints are reasonableꢀ It is
possible for either the zone sensor or for the Tracer® system to
send heating and cooling setpoints to the TUCꢀ Use the Tracer®
system or Everyware™ software to determine which source is
sending the setpointꢀ
Wiring
Verify the wiring of all end devices, such as valves and dampersꢀ Use
the manual overrides or the autocycle test to verify the operation of
these end devicesꢀ
Manual Cool Mode
Sent by Tracer®
If the Tracer® system places the TUC in manual cool mode, the TUC
cannot switch to heat mode and therefore cannot provide heating to
the zoneꢀ
Location of the Zone Sensor
Locate the zone sensor in an area where the temperature is represen-
tative of the average zone temperatureꢀ
UNT-IOM-6
115
Maintenance
Listed below are the recommended maintenance schedulesꢀ Instruc-
tions for specific maintenance procedures are given in the sections
following the checklistꢀ
Periodic
Maintenance
Checklist
WARNING: Allow rotating fan to stop before
servicing equipment. Failure to do so may cause severe
personal injury or death.
!
Monthly
1ꢀ Inspect the unit air filtersꢀ Clean or replace dirty filtersꢀ
Note: Building conditions may require filter change more or less
frequentlyꢀ
2ꢀ Check the main and auxiliary drain pans on fan-coil units to be
sure the pans are clean and do not impede the condensate flow
through the drain lineꢀ
Yearly
1ꢀ Inspect the unit cabinetry for chips or corrosionꢀ Clean or repair to
provide unit protectionꢀ
2ꢀ Inspect the fan wheel and housing for damageꢀ Rotate the fan
wheel manually to be sure movement is not blocked by obstructionsꢀ
3ꢀ Inspect the coil fins for excessive dirt or damageꢀ Remove dirt and
straighten finsꢀ
4ꢀ Clean and tighten all electrical connectionsꢀ
5ꢀ Inspect the strainer option for debris trapped in the filter screenꢀ
Change or clean air filters at least twice a yearꢀ Filters require more
frequent care under high load or dirty air conditions since a clogged
filter reduces airflowꢀ Table 37 on page 89 lists filter sizes for unitsꢀ
Throwaway and pleated media filters are available for all unitsꢀ Follow
the instructions below to replace the disposable filtersꢀ
Maintenance
Procedures
Filters
1ꢀ All models except vertical cabinets
Remove the front panel of the vertical recessed unit and open the
bottom panel door of the horizontal cabinet and horizontal recessed
unit to access the filterꢀ The front panel of the vertical cabinet unit
does not require removal to change the filterꢀ
116
UNT-IOM-6
Note: Vertical recessed, horizontal cabinet, & horizontal recessed
units with a bottom return have filter guides to secure the filter in
positionꢀ Also, if these unit types have a fresh air opening, they
require an additional filter for the fresh air openingꢀ
2ꢀ Pull the two plunger spring pins inward on the filter access door
and rotate door downwardꢀ
3ꢀ Remove the dirty filter(s) and replace or cleanꢀ
CAUTION: All unit panels and filters must be in
place prior to unit start-up. Failure to have panels and
filters in place may cause motor overload.
!
4ꢀ Replace the front/bottom panel of the unit for cabinet and recessed
unitsꢀ
Table 53. Filter Sizes, in. (cm)
Unit size
Main Filter
Fresh Air Filter
(models D, E, H with
bottom return & OA only)
02
1 x 8ꢀ875 x 19ꢀ125
(2ꢀ54 x 23 x 49)
1 x 5ꢀ5 x 19ꢀ13
(2ꢀ54 x 13ꢀ97 x 48ꢀ59)
03
1 x 8ꢀ875 x 19ꢀ125
(2ꢀ54 x 23 x 49)
1 x 5ꢀ5 x 19ꢀ13
(2ꢀ54 x 13ꢀ97 x 48ꢀ59)
Low Vertical
1 x 8ꢀ875 x 24ꢀ125
(2ꢀ54 x 23 x 61)
04
1 x 8ꢀ875 x 24ꢀ125
(2ꢀ54 x 23 x 61)
1 x 5ꢀ5 x 24ꢀ13
(2ꢀ54 x 13ꢀ97 x 61ꢀ29)
Low Vertical
1 x 8ꢀ875 x 33ꢀ625
(2ꢀ54 x 23 x 85)
06
1 x 8ꢀ875 x 33ꢀ625
(2ꢀ54 x 23 x 85)
1 x 5ꢀ5 x 33ꢀ63
(2ꢀ54 x 13ꢀ97 x 85ꢀ42)
Low Vertical
1 x 8ꢀ875 x 42ꢀ125
(2ꢀ54 x 23 x 107)
08
10
12
1 x 8ꢀ875 x 42ꢀ125
(2ꢀ54 x 23 x 107)
1 x 5ꢀ5 x 42ꢀ13
(2ꢀ54 x 13ꢀ97 x 107ꢀ0)
1 x 8ꢀ875 x 61ꢀ125
(2ꢀ54 x 23 x 155)
1 x 5ꢀ5 x 61ꢀ38
(2ꢀ54 x 13ꢀ97 x 155ꢀ91)
1 x 8ꢀ875 x 61ꢀ125
(2ꢀ54 x 23 x 155)
1 x 5ꢀ5 x 61ꢀ38
(2ꢀ54 x 13ꢀ97 x 155ꢀ91)
UNT-IOM-6
117
Clean the fan-coil unit’s main and auxiliary drain pans to ensure the
unit drains condensate properlyꢀ
Inspecting and
Cleaning Drain
Pans
Check the condensate drain pan and drain line to assure the conden-
sate drains properly at least every six months or as dictated by
operating experienceꢀ
If evidence of standing water or condensate overflow exists, immedi-
ately identify and remedy the causeꢀ Refer to Table 40 on page 99 for
possible causes and solutionsꢀ If the drain pan contains microbial
growth, clean and remove it immediatelyꢀ
Clean drain pans using the following procedure:
1ꢀ Disconnect all electrical power to the unitꢀ
2ꢀ Don the appropriate personal protective equipment (PPE)ꢀ
3ꢀ Remove all standing waterꢀ
4ꢀ Use a scraper or other tool to loosen any solid matterꢀ Remove
solid matter with a vacuum device that utilizes high efficiency particu-
late arrestance (HEPA) filters with a minimum efficiency of 99ꢀ97% at
0ꢀ3 micron particle sizeꢀ
5ꢀ Thoroughly clean the contaminated area(s) with a mild bleach and
water solution or an EPA-approved sanitizer specifically designed for
HVAC useꢀ Carefully follow the sanitizer manufacturer’s instructions
regarding the use of the productꢀ
6ꢀ Immediately rinse the drain pan thoroughly with fresh water to
prevent potential corrosion from the cleaning solution of the drain pan
and drain line componentsꢀ
7ꢀ Allow the unit to dry thoroughly before putting the system back into
serviceꢀ
8ꢀ Determine and correct the cause of the microbial contaminationꢀ
9ꢀ Be careful that the contaminated material does not contact other
areas of the unit or buildingꢀ Properly dispose of all contaminated
materials and cleaning solutionꢀ
Note: Standing water in drain pans can promote microbial growth
(mold) which may cause unpleasant odors and health-related indoor
air quality problemsꢀ If microbial growth (mold) is found, remove it
immediately by cleaning and santizing the unit properly#
118
UNT-IOM-6
1ꢀ To remove the auxiliary drain pan, loosen the hose clamp (installer
supplied) around the drain con-
Auxiliary Drain Pan
nection collar and disconnect the
drain lineꢀ
2ꢀ Remove the overflow drain line
to the auxiliary drain pan if it was
installedꢀ
3ꢀ Remove the condensate over-
flow switch option from the
auxiliary drain panꢀ
Figure 31. Insert the auxiliary
drain pan tabs into these slots
4ꢀ Slide the pan horizontally
towards the end of the large
groove of the mounting slots in
the chassis end panel and remove
pan from unitꢀ See Figure 31ꢀ
in the fan-coil’s chassis end
panel. A horizontal unit is
pictured.
CAUTION: Exercise extreme care when removing
auxiliary drain pan. Failure to do so may cause plastic
mounting tabs to break.
!
Note: When replacing the main drain pan, install it correctly under the
z-bar as pictured in Figure 32ꢀ
Main Drain Pan
Coil
Side
View
Main Drain Pan
Z-Bar
Figure 32. When replacing the
fan-coil’s main drain pan, install
it correctly under the z-bar.
UNT-IOM-6
119
Vertical units:
To remove the main drain pan on
vertical fan-coil units, disconnect
the clips holding the pan to the
fanboardꢀ Disconnect the main
and overflow drain hoses and
slide pan forward to removeꢀ See
Figure 33ꢀ
Figure 33. To remove the main
drain pan on vertical fan-coil
units, disconnect the clips
holding the pan to the
fanboard.
Horizontal units:
To remove the main drain pan on
a horizontal fan-coil unit, peel the
insulation from the edges of the
pan’s underside to access the
mounting screwsꢀ Remove the
screws and lower the end of the
drain pan closest to the control
boxꢀ Remove the drain spout by
pulling it from the hole in the
chassis end panelꢀ See Figure
34ꢀ
Figure 34. To remove the main
drain pan on horizontal fan-
coil units, peel the insulation
from the edges of the pan’s
underside to access the
mounting screws.
Note: Do not operate the fan-coil unit without the main and auxiliary
drain pans in place to prevent condensate leakageꢀ
Make provisions to ensure adequate protection against coil freeze-upꢀ
If the fan-coil units are not in operation, the coil/s should be vented at
the factory vent/s and drained at the piping system drain port/sꢀ See
Table 38 on page 94 for approximate piping package volumes for
piping systems using ethylene glycolꢀ Table 39 on page 94 lists
approximate hydronic coil volumesꢀ
Winterizing the
Coil
It is necessary to properly prepare the units for cold weatherꢀ If a coil
is not in use and is subject to temperatures below 32° F, drain the
coil to prevent coil freezeupꢀ Locate the drain (installer supplied) in
the field piping systemꢀ
120
UNT-IOM-6
Coils become externally fouled as a result of normal operationꢀ Dirt on
the coil surface reduces it’s heat transfer ability that can result in
comfort problems, increased airflow resistance, and thus increased
operating energy costsꢀ If the coil surface dirt becomes wet, which
commonly occurs with cooling coils, microbial growth (mold) may
result and potentially cause unpleasant odors and health-related
indoor air quality problemsꢀ
Inspecting and
Cleaning Coils
Inspect coils at least every six months or more frequently as dictated
by operating experienceꢀ Required cleaning frequency depends on
the system operating hours, filter maintenance and efficiency, and dirt
loadꢀ The Trane Company recommends the following method of
cleaning coils:
1ꢀ Disconnect all electrical power to the unitꢀ
Steam and Water
Coils
2ꢀ Don the appropriate personal protective equipment (PPE)ꢀ
3ꢀ Gain access to the both sides of the unit coil sectionꢀ
4ꢀ Use a soft brush to remove loose debris from both sides of the coilꢀ
5ꢀ Use a steam cleaning machine, starting from the top of the coil
and working downwardꢀ Clean the leaving air side of the coil first, then
the entering air sideꢀ Use a block-off to prevent steam from blowing
through the coil and into a dry section of the unitꢀ
6ꢀ Repeat step 5 as necessaryꢀ Confirm that the drain line is open
following completion of the cleaning processꢀ
7ꢀ Allow the unit to dry thoroughly before putting the system back into
serviceꢀ
8ꢀ Straighten any coil fins that may have been damaged during the
cleaning process with a fin rakeꢀ
9ꢀ Replace all panels and parts and restore electrical power to the
unitꢀ
10ꢀ Use caution to assure that any contaminated material does not
contact other areas of the unit or buildingꢀ Properly dispose of all
contaminated materials and cleaning solutionꢀ
UNT-IOM-6
121
Table 54. Factory Piping Package Volumes, oz. (mL)
Piping Package
Volume
6 (178)
12 (355)
Main coil
Auxiliary coil
Table 55. Hydronic Coil Volumes/Heating & Cooling, gal.
Unit Size
Total # Rows
Volume
02
1
2
3
4
ꢀ05
ꢀ10
ꢀ14
ꢀ20
03
04
06
08
10
12
1
2
3
4
ꢀ06
ꢀ12
ꢀ18
ꢀ24
1
2
3
4
ꢀ08
ꢀ15
ꢀ23
ꢀ30
1
2
3
4
ꢀ11
ꢀ22
ꢀ33
ꢀ44
1
2
3
4
ꢀ14
ꢀ28
ꢀ42
ꢀ56
1
2
3
4
ꢀ18
ꢀ35
ꢀ53
ꢀ71
1
2
3
4
ꢀ21
ꢀ42
ꢀ62
ꢀ83
Note: 1-row coil refers only to the 1-row heating coil in some 4-pipe
configurationsꢀ
122
UNT-IOM-6
The process of cooling and dehumidification produces condensate
(water) which must be continuously removed from the air handling
unitꢀ The entering air side of the cooling coil to the leaving edge of the
drain pan is considered to be the “wet” section of the unitꢀ Other
potentially “wet” sections are immediately downstream of a humidifier
and/or an fresh air intake sectionꢀ
Inspecting and
Cleaning the
Internal Insulation
on Fan-Coils
It is common for the “wet” section components, including the internal
insulation, to become wet during normal operationꢀ Therefore, inspect
the internal insulation in these areas periodically to assure it is clean
and free of dirt or microbial growth (mold)ꢀ Inspect units every six
months or more frequently if operating experience dictatesꢀ Accumu-
lated dirt and other organic matter exposed to water or extended
periods of high relative humidity (60% or higher) may support micro-
bial growthꢀ Clean the insulation to prevent the unit from becoming an
IAQ contaminant sourceꢀ
Also, inspect internal insulation in the “dry” areas of the unit periodi-
cally to ensure the insulation is clean and dryꢀ Wet insulation in an
area that is normally considered to be “dry” may indicate an opera-
tional problemꢀ Refer to Table 40 on page 99 for further informationꢀ
Inspect the equipment a minimum of every six months or more
frequently if operating experience dictatesꢀ When accumulated dirt
and other organic matter is exposed to water or extended periods of
high relative humidity (60% or higher) may support microbial growth,
an indoor air quality contaminant sourceꢀ
If evidence of contamination exists in either the wet or dry sections,
take immediate action to determine and eliminate the causeꢀ Remove
the contamination and sanitize the affected areaꢀ See Tabale 40 on
page 99 for assistance in identifying the causeꢀ Remove and clean
any microbial growth on a non-porous insulating surface (eꢀgꢀ closed-
cell insulation or sheet metal surface)ꢀ
The Trane Company recommends the following procedure for proper
cleaning the fan-coil internal insulation and sheet metal:
1ꢀ Disconnect all electrical power to the unitꢀ
2ꢀ Don the appropriate personal protective equipment (PPE)ꢀ
3ꢀ Thoroughly clean the contaminated area(s) with an EPA-approved
sanitizer specifically designed for HVAC useꢀ Use a brush for sheet
metal surfaces or a soft sponge on closed-cell foam surface to
mechanically remove the microbial growthꢀ Be careful not to damage
the non-porous surface of the insulationꢀ Carefully follow the sanitizer
manufacturers instructions regarding personal protection and ventila-
tionꢀ
UNT-IOM-6
123
4ꢀ Rinse the affected surfaces thoroughly with fresh water and a fresh
sponge to prevent potential corrosion of the drain pan and drain lineꢀ
5ꢀ Ensure the drain line remains open following the cleaning processꢀ
6ꢀ Replace all panels and parts and restore electrical power to the
unitꢀ
7ꢀ Allow the unit to dry completely before putting it back into serviceꢀ
8ꢀ Do not allow any contaminated material to contact other areas of
the unit or buildingꢀ Properly dispose of all contaminated materials
and cleaning solutionꢀ
Inspect the fan at least every six months or more frequently if operat-
ing experience dictatesꢀ Clean accumulated dirt and organic matter
on the interior fan surface immediatelyꢀ
Inspecting and
Cleaning the Fan
The Trane Company recommends the following procedure for cleaning
fan surfaces:
1ꢀ Disconnect all electrical power to the unitꢀ
2ꢀ Don the appropriate personal protective equipment (PPE)ꢀ
3ꢀ Use a portable vacuum with HEPA filtration to remove loose dirt
and organic matterꢀ The filter should be 99ꢀ97% efficient at 0ꢀ3 micron
particle sizeꢀ
4ꢀ If no microbial growth (mold) exists, thoroughly clean the fan and
associated components with an industrial cleaning solutionꢀ Carefully
follow the cleaning solution manufacturer’s instructions regarding
personal protection and ventilation when using their productꢀ
5ꢀ If microbial growth (mold) is present, remove the contamination
(Step 2) and thoroughly clean the affected area with an EPA-approved
sanitizer specifically designed for HVAC useꢀ Carefully follow the
sanitizer manufacturer’s instructions regarding the use of the productꢀ
6ꢀ Rinse the affected surfaces thoroughly with fresh water and a fresh
sponge to prevent potential corrosion of metal surfacesꢀ
124
UNT-IOM-6
7ꢀ Allow the unit to dry completely before putting it back into serviceꢀ
8ꢀ Do not allow any contaminated material to contact other areas of
the unit or buildingꢀ Properly dispose of all contaminated materials
and cleaning solutionꢀ
If microbial growth (mold) is present, determine the cause of the
contamination and take action to prevent reoccuranceꢀ
UNT-IOM-6
125
Follow the procedure below when replacing the coil or making repairs
to the fan or motorꢀ
Fan Board
Assembly
Removal
WARNING: Allow rotating fan to stop before
!
servicing equipment. Failure to do so may cause severe
personal injury or death.
Vertical Units
1ꢀ Remove the front panel of cabinet and recessed unitsꢀ
2ꢀ Pull the main and overflow drain hoses of the main drain pan into
the inside of the fan-coil chassis end panelꢀ
3ꢀ Remove the two fanboard
mounting screws shown in
Figure 35ꢀ
4ꢀ Slide the fanboard out horizon-
tally to removeꢀ
Horizontal Units
1ꢀ Open the bottom panel of
cabinet and recessed modelsꢀ
Figure 35. Remove the two
mounting screws located
under the fanboard to slide it
out.
2ꢀ Remove the main drain pan
following the instructions given
under the drain pan section above for horizontal fan-coil unitsꢀ
3ꢀ While supporting the fanboard in place, remove the two fanboard
mounting screws which secure the fanboard to the unitꢀ
CAUTION: Support the fanboard when removing it
from the unit. Failure to do so may cause personal injury.
!
The capacitor for all unit motors can be replaced should it failꢀ
Contact the local Trane service department to replace the motor
capacitor in the event it failsꢀ However, the motor itself cannot be
repaired or rewoundꢀ If the motor fails, record the model number from
the unit nameplate and present to the local Trane Service Parts
Center to purchase a replacementꢀ The motor bearings are perma-
nently lubricated and do not require any further oilingꢀ
Replacing the Motor
126
UNT-IOM-6
After removing the fanboard assembly from the unit, disconnect the
fan wheel/wheels from the motor shaft by loosening the Allen head
setscrew on the fan wheel hub collarꢀ Next, remove the mounting
bolts holding the fan motor plate to the mounting bracket of the
fanboardꢀ Then remove the motor by sliding the fan shaft from the fan
wheel hubꢀ
During re-assembly, make certain the fan wheel(s) is/are properly
centered in the fan housing to prevent the fan wheel from contacting
the housing on either sideꢀ After the unit has been re-assembled,
verify that no unusual noise or vibration is present at startupꢀ
To order control components such as relays, contactors, transform-
ers, low temperature detection devices, condensate overflow detec-
tion devices, differential pressure switches, sensors, control valves
and actuators, contact the local Trane Service Parts Centerꢀ To order,
the Trane parts center will need the unit model number (which can be
found on the unit nameplate), the serial number, and the part name or
IDꢀ
Control Device
Replacement
Table 56ꢀ Trouble Shooting
Problem
Possible Cause
Remedy
Drain pan is overflowing
Standing water in drain pan
Wet interior insulation
Plugged drain line
Unit not level
Clean drain line
Level unit
Unit not level
Plugged drain line
Level unit
Clean drain line
Coil face velocity too high
Drain pan leaks/overflowing
Condensation on surfaces
Reduce fan speed
Repair leaks
Insulate surfaces
Excess dirt in unit
Missing filters
Filter bypass
Replace filters
Reduce filter bypass
Microbial growth (mold)
Moisture problems
See “External Insulating
Requirements” section
on page 20ꢀ
Standing water in drain pan
See “Inspecting and cleaning
the drain pan” section
on page 90ꢀ
UNT-IOM-6
127
Appendix
Factory Piping
Packages
Automatic Circuit Setter (C)
128
UNT-IOM-6
Fan Mode Switch Typical Wiring
Diagram
For Reference Only:
This schematic shows typical wiring
of a fan-coil. It is not intended for a
basis of design or for equipment
installation purposes in the field.
For an as-built schematic specific to
a particular unit, please see the
ship-with schematic for that specific
unit.
Two-pipe unit without control valve
Fan mode switch option “K”
Wall mounted mode switch — off/
high/med/low
Disconnect switch
Automatic two-position fresh air
damper
For reference only:
This schematic show typical wiring of a fan-coilꢀ It is not intended for a basis of design or for equipment
installation purposes in the fieldꢀ For an as-built schematic specific to a particular unit, please see the
ship-with schematic for that specific unitꢀ
UNT-IOM-6
129
Tracer® ZN.010 Typical Wiring Diagram
NOTES:
1. UNLESS OTHERWISE NOTED, ALL SWITCHES ARE
SHOWN AT 25 C (77 F), AT ATMOSPHERIC PRESSURE, AT
50% RELATIVE HUMIDITY, WITH ALL UTILITIES TURNED
OFF, AND AFTER A NORMAL SHUTDOWN HAS
OCCURRED.
2. DASHED LINES INDICATE RECOMMENDED FIELD WIRING
BY OTHERS. DASHED LINE ENCLOSURES AND/OR
DASHED DEVICE OUTLINES INDICATE COMPONENTS
PROVIDED BY THE FIELD. SOLID LINES INDICATE WIRING
BY TRANE CO.
3. NUMBERS ALONG THE RIGHT SIDE OF THE SCHEMATIC
DESIGNATE THE LOCATION OF CONTACTS BY LINE
NUMBER. AN UNDERLINED NUMBER INDICATES A
NORMALLY CLOSED CONTACT.
4. ALL FIELD WIRING MUST BE IN ACCORDANCE WITH THE
NATIONAL ELECTRIC CODE (NEC), STATE AND LOCAL
REQUIREMENTS.DEVICE PREFIX
LOCATION GUIDE
AREA LOCATION
1
2
3
4
5
6
CONTROL PANEL
CONTROL END
PIPING END
FAN SECTION
COIL SECTION
CUSTOMER
For Reference Only:
This schematic shows typical wiring of a fan-coil. It is not intended for a basis of design or for equipment installation
purposes in the field. For an as-built schematic specific to a particular unit, please see the ship-with schematic for that
specific unit or contact your local Trane representative.
Two-pipe autochangeover
Two-position N/C control valve
Two-position N/C fresh air damper actuator
EWT sensor
Condensate overflow detection
Low temperature detection
Unit mounted fan mode switch and setpoint dial
Return air temperature sensor
130
UNT-IOM-6
Tracer® ZN.010 Typical Wiring Diagram
LEGEND
DESCRIPTION
DEVICE
DESIG.
1K1-3
LINE
NUMBER
25-26-27
DEVICE PREFIX
LOCATION GUIDE
FAN STARTERS
AREA LOCATION
1K4
5HR1-2
565-8
3612
1T1
1TB1
1TB6
ELECTRIC HEAT CONTACTOR
HEATING ELEMENTS
LIMIT SWITCHES
ELEC. HEAT AUTO LOCKOUT SWT
TRANSFORMER
MAIN POWER TERMINAL BLOCK
TERMINAL STRIP
30
11-12
11-12
30
21
5
1
2
3
4
5
6
CONTROL PANEL
CONTROL END
PIPING END
FAN SECTION
COIL SECTION
CUSTOMER
1U1
2U2
358
151
159
481
2L2
3L1
THERMOSTAT MODULE
ZONE SENSOR MODULE
CONDENSATE OVERFLOW SW
DISCONNECT SW
FREEZE-STAT
FAN MOTOR
23
24
36
3
38
9
NOTES:
1. UNLESS OTHERWISE NOTED, ALL
SWITCHES ARE SHOWN AT 25 C (77 F),
AT ATMOSPHERIC PRESSURE, AT 50%
RELATIVE HUMIDITY, WITH ALL UTILITIES
TURNED OFF, AND AFTER A NORMAL
SHUTDOWN HAS OCCURRED.
DAMPER ACTUATOR
MAIN COIL VALVE
32
28
2. DASHED LINES INDICATE
3RT1
AUTO CHANGE TEMP SENSOR
34
RECOMMENDED FIELD WIRING BY
OTHERS. DASHED LINE ENCLOSURES
AND/OR DASHED DEVICE OUTLINES
INDICATE COMPONENTS PROVIDED BY
THE FIELD. SOLID LINES INDICATE
WIRING BY TRANE CO.
3. NUMBERS ALONG THE RIGHT SIDE OF
THE SCHEMATIC DESIGNATE THE
LOCATION OF CONTACTS BY LINE
NUMBER. AN UNDERLINED NUMBER
INDICATES
A
NORMALLY CLOSED
CONTACT.
4. ALL FIELD WIRING MUST BE IN
ACCORDANCE WITH THE NATIONAL
ELECTRIC CODE (NEC), STATE AND
LOCAL REQUIREMENTS.
For Reference Only:
This schematic shows typical wiring of a fan-coil. It is not intended for a basis of design or for equipment installation
purposes in the field. For an as-built schematic specific to a particular unit, please see the ship-with schematic for that
specific unit or contact your local Trane representative.
Two-pipe autochangeover with electric heat
Two-position N/O control valve
Electric heat contactor
Two-position N/C fresh air damper actuator
EWT sensor
Electric heat limit switch(es)
Condensate overflow detection
Low temperature detection
Wall mounted fan mode switch, setpoint dial, zone temperature sensor, and unit mounted disconnect switch
UNT-IOM-6
131
Tracer® ZN.010 Typical Wiring Diagram
NOTES:
1. UNLESS OTHERWISE NOTED, ALL
SWITCHES ARE SHOWN AT 25 C (77 F),
AT ATMOSPHERIC PRESSURE, AT 50%
RELATIVE HUMIDITY, WITH ALL UTILITIES
TURNED OFF, AND AFTER A NORMAL
SHUTDOWN HAS OCCURRED.
LEGEND
DESCRIPTION
DEVICE
DESIG.
1K1-3
LINE
NUMBER
25-26-27
FAN STARTERS
2. DASHED LINES INDICATE
RECOMMENDED FIELD WIRING BY
OTHERS. DASHED LINE ENCLOSURES
AND/OR DASHED DEVICE OUTLINES
INDICATE COMPONENTS PROVIDED BY
THE FIELD. SOLID LINES INDICATE
WIRING BY TRANE CO.
3. NUMBERS ALONG THE RIGHT SIDE OF
THE SCHEMATIC DESIGNATE THE
LOCATION OF CONTACTS BY LINE
NUMBER. AN UNDERLINED NUMBER
1T1
1TB6
1U1
TRANSFORMER
21
23
TERMINAL STRIP
THERMOSTAT MODULE
INDICATES
CONTACT.
A
NORMALLY CLOSED
358
151
159
2U2
CONDENSATE OVERFLOW
DISCONNECT SW
LOWLIMIT
ZONE SENSOR MODULE
FAN SWITCH
36
3
4. ALL FIELD WIRING MUST BE IN
ACCORDANCE WITH THE NATIONAL
ELECTRIC CODE (NEC), STATE AND
LOCAL REQUIREMENTS.
24
28
9
481
FAN MOTOR
DEVICE PREFIX
LOCATION GUIDE
AREA LOCATION
2L2
3L1
3L3
DAMPER ACTUATOR
MAIN COIL VALVE
HEATING COIL VALVE
32
28
30
1
2
3
4
5
6
CONTROL PANEL
CONTROL END
PIPING END
FAN SECTION
COIL SECTION
CUSTOMER
For Reference Only:
This schematic shows typical wiring of a fan-coil. It is not intended for a basis of design or for equipment installation
purposes in the field. For an as-built schematic specific to a particular unit, please see the ship-with schematic for that
specific unit or contact your local Trane representative.
Four-pipe
Two-position N/C cooling control valve
Two-position N/O heating control valve
Two-position N/C fresh air damper actuator
Condensate overflow detection
Low temperature detection
Unit mounted fan mode switch,
Wall mounted setpoint dial and zone temperature sensor
Unit mounted disconnect switch
132
UNT-IOM-6
TUC Typical Wiring Diagram
For Reference Only:
This schematic shows typical wiring of a fan-coil. It is not
intended for a basis of design or for equipment installation
purposes in the field. For an as-built schematic specific to a
particular unit, please see the ship-with schematic for that
specific unit or contact your local Trane representative.
Two-pipe unit with a modulating valve
Electric heat
terminal unit controller
Wall mounted zone sensor — off/auto/high/med/low
Disconnect switch
Automatic two-position fresh air damper
Low temperature detection
Condensate overflow detection
3
TUC Typical Wiring Diagram
For Reference Only:
This schematic shows typical wiring of a fan-coil. It is not
intended for a basis of design or for equipment installation
purposes in the field. For an as-built schematic specific to a
particular unit, please see the ship-with schematic for that
specific unit or contact your local Trane representative.
Four-pipe unit with control valves (both modulating)
terminal unit controller
Wall mounted zone sensor — off/auto/high/med/low
Disconnect switch
Automatic two-position fresh air damper
Low temperature detection
Condensate overflow detection
OM-6
Literature Order Number
File Number
UNT-IOM-6
PL-TD- UNT-IOM-6-4-00
UNT-IOM-5
Supersedes
The Trane Company
Stocking Location
LaCrosse
Worldwide Applied Systems Group
3600 Pammel Creek Rd.
LaCrosse, WI 54601-7599
www.trane.com
Since The Trane Company has a policy of continuous product improvement, it reserves the right to
change design and specifications without notice.
An American Standard Company
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