42 Series
Fan Coil Units
Application Data
Control Selection Guide
for Fan Coil Air Conditioners
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Book 3
PC 201
Catalog No. 514-203
Printed in U.S.A.
Form 42-3XC
Pg 1
6-90
Replaces: 42-2XC
Tab 7a
CONTROL SELECTION GUIDE
Use this guide to make sure that all necessary components are provided for and that the components are compatible
with the required control system.
NOTE: When thermostatic fan control is selected or when unit outside air dampers are used, unit-mounted thermostats
are not recommended as their use will result in poor room temperature sensing.
CHANGEOVER
FAN
SYSTEM
DESCRIPTION
THERMOSTAT
None
ON
VALVE
NOTES
SWITCH (SW)
SUPPLY PIPE
Fan
Control
(2-Pipe)
Fan manually cycled
None
None
None
Standard
Not recommended
for high humidity
application
3-Speed SW
Thermostat cycles fan on-off
from speed set with
fan switch.
Wall mounted
includes heat-cool
switch.
None
Thermostat has
integral
3-Speed SW
Thermostat cycles fan on-off
from fan speed set
with switch. Mode
Wall mounted.
Heating/cooling
Thermostat
Yes
Yes
None
Standard
Unit mounted
3-Speed SW
thermostats provide
very poor room
automatically switched
by changeover
temperature control
sensing water temp.
Thermostat cycles fan from
high to low on cooling
and low to off on heating.
Wall or unit
mounted
None
No Standard
3-Speed Switch,
ON-OFF toggle SW
only
Best fan cycle
control for
high humidity
applications
Two-
Thermostat cycles valve
open or closed.
Wall mounted
includes heat-cool
switch.
None
Yes
Motorized (N.C.)
3-way or 2-way,
Thermostat
has integral
Valve packages
with belled end(s)
for field soldering
to coil.
position
electric
valves
(2-pipe)
no bypass required. 3-Speed SW
Thermostat cycles valve
open or closed.
Mode automatically
switched by changeover
sensing water temp.
Wall or unit
mounted.
Heating/cooling
Thermostat
Motorized (N.C.)
3-way or 2-way
Standard
3-Speed SW.
Others have
thermostats with
integral 3-Speed SW
Pneumatic
Thermostat modulates
By others.
By others.
2- and 3-way
Standard
Factory assembled
in valve package
w/flare nuts.
Valve packages
with belled end(s)
for field soldering
to coil.
modulating pneumatic control valve.
furnished by others. 3-Speed SW
Can be equipped
with factory
valves
(2-pipe)
assembled
valve package.
Two-
Thermostat cycles valve
open or closed. 2° F after
valve closes, thermostat
activates electric heater.
Heater can’t turn on
Wall or unit
Yes.
Motorized
Standard
Valve packages
with belled end(s)
for field soldering
to coil.
position
electric
valve with
Auxiliary
Electric
Heat
mounted. Sequenced Two Required.
heating and cooling.
3-way or 2-way
3-Speed SW
Others have
thermostats with
integral 3-Speed SW
if hot water is in coil.
Thermostat cycles valve
open or closed. Manual
changeover switch
changes thermostat to
heat to activate electric
heater.
Wall mounted
includes heat-cool
switch.
None
Motorized
3-way or 2-way,
no bypass required
Thermostat
has integral
3-Speed SW
Valve packages
with belled end(s)
for field soldering
to coil.
(2-pipe)
Two-
Thermostat cycles valve
open or closed.
Manual changeover switch
changes thermostat to heat
to activate electric heater.
Wall mounted
includes heat-cool
switch.
None
Motorized (N.C.)
3-way or 2-way,
no bypass required
Thermostat
has integral
3-Speed SW
Valve packages
with belled end(s)
for field soldering
to coil.
position
electric
valve with
total
electric
heat
(2-pipe)
Thermostat cycles valve
open or closed.
2° F after valve closes,
thermostat activates
electric heater.
Wall or unit
mounted.
Sequenced heating
and cooling
None
Motorized (N.C.)
3-way or 2-way,
no bypass required
Standard
3-Speed SW
Pneumatic
Thermostat modulates
By others.
By others.
2- and 3-way
Standard
Factory assembled
in valve package
w/flare nuts.
Valve packages
with belled end(s)
for field soldering
to coil.
modulating pneumatic control valve.
furnished by others. 3-Speed SW
Can be equipped
with factory
valves
(2-pipe)
After changeover,
thermostat
activates electric heater.
assembled
valve package.
Two-
Thermostat cycles
Wall mounted
includes subbase
with heat-cool
switch.
None
None
Motorized (N.C.)
3-way or 2-way
(requires 2 valves)
Thermostat
has integral
3-Speed SW
Valve packages
with belled end(s)
for field soldering
to coil.
position
electric
valves
(4-pipe)
cooling and heating
valves open or closed.
Thermostat cycles cooling
valve open or closed. 2° F
after valve closes,
thermostat cycles
heating valve open or closed.
Wall or unit
mounted.
Sequenced heating
and cooling.
Motorized (N.C.)
3-way or 2-way
(requires 2 valves)
Standard
3-Speed SW.
Others have
thermostats
with integral
3-Speed SW
Pneumatic
Thermostat modulates
By others.
By others.
2- or 3-way
Standard
Factory assembled
in valve package
w/flare nuts.
Valve packages
include unions for
for field assembly
to coil.
modulating cooling valve.
furnished by others. 3-Speed SW
Can be equipped
with factory
valves
(4-pipe)
After changeover,
thermostat modulates
heating valve.
assembled
valve package.
*If system is HEATING-ONLY or COOLING-ONLY, no changeover or bypass is required.
NOTE: Unit-mounted thermostats are not recommended with either fan-cycle control or applications with outside air dampers.
3
STANDARD WIRING PACKAGES
The standard switch has LOW, MEDIUM, HIGH and OFF
positions plus an auxilliary contact to energize thermostats,
valves, dampers, etc.
NOTE: Wiring diagrams are for 120-v power supply. If other
voltages for heaters or controls are specified, wiring may dif-
fer from that shown.
IMPORTANT: Wiring diagrams shown depict typical
control functions. Refer to unit wiring label for spe-
cific functions.
Manual Fan Control — On all Vertical Cabinet units,
the standard fan-speed switch is furnished unit-mounted and
wired. On all Vertical Furred-In units and all Horizontal units,
the switch is shipped separately on a decorative wall plate
for field mounting and wiring.
The standard 3-speed switches are illustrated on page 12
(unit mounted) and on page 10 (wall mounted).
For NOTES, see below.
THERMOSTAT OR
Thermostatic Fan Control, 2-Pipe Systems —
The thermostat cycles the fan on and off from any selected
speed setting to maintain selected room temperature. Con-
trols can be wired for heating-only, cooling-only or for heating/
cooling by the addition of an automatic changeover device
that senses water temperature and changes the action of the
thermostat as required.
WIRING PACKAGE*
UNIT
LOCATION
TYPE
Heating or Heating and Cooling
Cooling Only Plus Changeover†
Vertical Unit Mounted
N/A
N/A
Vertical
22-C, 22-D
22-E, 22-F
or
Wall Mounted
22-A, 22-B
Horizontal
For control package descriptions, see control components
sections entitled Remote-Mounted Controls and Unit-
Mounted Controls, pages 10-13.
*Packages listed on current price pages. First 2 digits are item
numbers.
†For alternate thermostat with manual changeover. Refer to current
price pages.
NOTES:
1. Motors are thermally protected.
2. Use copper conductors only.
3. See unit nameplate for power supply. Provide disconnect means
and overload protection as required.
4. Unit-mounted thermostats are not recommended for fan control
because of poor temperature sensing. Fan control not available
on 42VC,VE Loboy units.
4
Thermostatic Fan Control, 2-Pipe System with
PACKAGE CODE*
UNIT
LOCATION
Safety Cycle — This control is used for high humidity
situations in which condensate problems can occur if fan is
turned off while chilled water is still running through the
coil.
The wiring provides fan cycling from HIGH to LOW on
the cooling cycle and from LOW to OFF on the heating cycle.
An ON-OFF toggle switch replaces the standard 3-speed fan
switch. The toggle switch can be concealed to ensure that
the unit runs on low speed when cooling. This action greatly
reduces the chance of condensation problems that exist with
other standard fan cycling controls.
Heating and Cooling
Plus Changeover
TYPE
Vertical
Unit Mounted
Wall Mounted
24-R
Vertical
or
Horizontal
23-17
* Packages listed on current price pages.
For control package descriptions, see control components
section entitled Remote-Mounted Controls and Unit-Mounted
Controls.
For NOTES, see below.
For control package descriptions, see control components
sections entitled Remote-Mounted Controls and Unit-
Mounted Controls.
Thermostatic Electric Valve Control, 2-Pipe —
A thermostatically controlled 2-position valve provides su-
perior control to fan cycling. With this control, the fan runs
continuously unless it is manually switched to the OFF po-
sition. The fan must be on before the valve can be opened to
supply water to the coil.
This system can be used for normal 2-pipe changeover
systems and can also be furnished for cooling-only or heating-
only applications by omitting the changeover and specifying
which application is intended.
THERMOSTAT OR
WIRING PACKAGE*
UNIT
TYPE
ELECTRIC
VALVE
Heating and
Cooling
LOCATION
Heating or
Cooling
Only
Plus
Changeover†
Any 2- or
3-way,
Unit
24-M,
24-N
Vertical
24-L
Mounted
2-position
valve
Vertical
or
Horizontal
Wall
Mounted
22-C, 22-D,
22-E, 22-F
22-A, 22-B
package.
*Packages listed on current price pages. First 2 digits are item
numbers.
†For alternate thermostat with manual changeover. Refer to current
price pages.
NOTES:
1. Motors are thermally protected.
2. Use copper conductors only.
3. See unit nameplate for power supply. Provide disconnect means
and overload protection as required.
5
STANDARD WIRING PACKAGES (cont)
Two control methods are available:
Thermostatic 2-Pipe Auxiliary Electric Heat
1. Use the standard automatic changeover thermostat with a
dead band between heating and cooling, or —
2. Use a manual changeover thermostat. With this method
only one changeover is required.
with Valve Control — This system, also called Twi-
light or Intermediate Season electric heat, goes a long way
towards solving the spring and fall control problems of 2-pipe
systems.
You can run chilled water late into the fall, turn it on early
in the spring and still have heat available to all units when-
ever required.
In winter the system is switched over to hot water. Two
changeover devices are required for this. One device switches
the action of the thermostat and the other locks out the elec-
tric heat when hot water is in the coil.
With this system, the fan runs continuously unless manu-
ally switched to OFF position. Fan must be on before ther-
mostat can send signal to open chilled water valve or turn on
electric heater.
Be sure to include a 2-way or 3-way electric valve with
this system.
NOTE: Wiring diagrams are for 120-v power supply. If other
voltages for heaters or controls are specified,wiring may dif-
fer from that shown.
For control package descriptions, see control components
sections entitled Remote-Mounted Controls and Unit-
Mounted Controls.
WIRING PACKAGE*
UNIT
TYPE
ELECTRIC
VALVE
LOCATION
Automatic System
Manual System
Unit
Mounted
Vertical
24-Q
Available on Special Order.
Any 2- or 3-way,
2-position valve
Package.
Vertical
or
Horizontal
22-J, 22-K,
23-09, 23-10
Wall Mounted
23-15, 23-16
*Packages on current price pages.
NOTES:
1. Motors are thermally protected.
2. Use copper conductors only.
3. See unit nameplate for power supply. Provide disconnect means
and overload protection as required.
6
changeover thermostat is also suitable. A 2-way or 3-way
valve must also be used so that the chilled water is off when-
ever the heater is on. No changeover device to sense water
temperature is necessary.
NOTE: Wiring diagrams are for 120-v power supply. If other
voltages for heaters or controls are specified, wiring may dif-
fer from that shown.
For control package descriptions, see control components
sections entitled Remote-Mounted Controls and Unit-
Mounted Controls.
Thermostatic 2-Pipe Total Electric Heat with-
Valve Control — With this system, the complete heat-
ing requirement for the space is provided by the electric heater;
the water system is never changed over for heating. It is there-
fore possible, just as with 4-pipe systems, to have heating or
cooling at any time of the year.
The fan runs continuously unless it is manually switched
to OFF position. Fan must be on before thermostat can send
signal to open chilled water valve or turn on electric heater.
Normally, an automatic changeover thermostat with a dead
band between heating and cooling is used, but a manual
WIRING PACKAGE*
UNIT
TYPE
ELECTRIC
VALVE
LOCATION
Automatic System
Manual System
Unit
Mounted
Vertical
24-Q
Available on Special Order.
Any 2- or 3-way,
2-position valve
Package.
Vertical
or
Horizontal
22-J, 22-K,
23-09, 23-10
Wall Mounted
23-15, 23-16
*Packages on current price pages.
NOTES:
1. Motors thermally protected.
2. Use copper conductors only.
3. See unit nameplate for power supply. Provide disconnect means
and overload protection as required.
7
STANDARD WIRING PACKAGES (cont)
With this system, the fan runs continuously unless it is
manually switched to OFF position. Fan must be on before
thermostat can send signal to open the chilled water or hot
water valve.
Thermostatic Valve Control, 4-Pipe — The 4-pipe
system provides the ultimate in economy and room tem-
perature control. Both hot water and chilled water are avail-
able at any time.
NOTE: Wiring diagrams are for 120-v power supply. If other
voltages for heaters or controls are specified, wiring may dif-
fer from that shown.
For control package descriptions, see control components
sections entitled Remote-Mounted Controls and Unit-
Mounted Controls.
Normally an automatic changeover thermostat is used, but
a manual changeover thermostat is also suitable. Two 2-way
valves, two 3-way valves, or one 2-way plus one 3-way valve
must be selected. An automatic changeover device to sense
water temperature is not required.
WIRING PACKAGE*
ELECTRIC
VALVE
UNIT TYPE
Vertical
LOCATION
Automatic System
Manual System
Unit Mounted
24-P
Available on Special Order.
Any 2- or 3-way,
2-position valve
package.
Vertical
or
Horizontal
22-G, 22-H,
23-07, 23-08
Wall Mounted
23-13, 23-14
*Packages on current price pages.
NOTES:
1. Motors thermally protected.
2. Use copper conductors only.
3. See unit nameplate for power supply. Provide disconnect means
and overload protection as required.
8
ELECTRIC HEAT
42S stack units, the strip heater is located in the fan dis-
charge on the leaving side of the coil.
Application — Electric heaters are available for
in-stallation on Carrier fan coil units in the following
applications.
TOTAL ELECTRIC HEAT — This system provides com-
plete heating during the heating season; no boiler is re-
quired. Heating and cooling are now available on an indi-
vidual basis throughout the year with a 2-pipe system.
Chilled water is used for cooling and the electric heater is
used for heating. Room controls can be supplied for
either manual or automatic changeover.
AUXILIARY ELECTRIC HEAT — This system is used for
heating between seasons or during the cooling season when
chilled water is being circulated. Individual room controls
are supplied to provide electric heat only when chilled water
is being circulated through the system. Water flow through
the unit is shut off when the heater is turned on.
SHEATH HEATERS — Used with Model 42V vertical units.
These heaters consist of the highest grade resistance wire,
centered in a 1⁄2-in. diameter copper-plated steel sheath. The
wire is insulated from the sheath by magnesium oxide pow-
der packed around it. To increase the heater surface exposed
to air, a 11⁄4-in. OD fin of copper-plated steel is wound around
the sheath in a continuous spiral that makes 5 turns per lin-
eal inch. Sheath and fin are permanently bonded together by
copper brazing.
The heaters are positioned on the leaving (reheat) side of
the unit coil. On special units with high efficiency motors, a
strip heater will be installed in the fan discharge on the in-
coming (preheat) side of the unit coil.
Heater Electrical Data
During the winter heating season, heating is provided
by hot water circulated through the system. A changeover
device locks out the electric heat when the hot water is
circulated.
1. Load voltage may be 120, 208, 240 or 277 volts. For unit
size and kW limitations, refer to the specific unit
catalogs.
2. All heaters are single stage and single phase.
Heater Construction
STRIP HEATERS — Used with Model 42C ceiling units,
Model 42D ducted units and Model 42S stack units.
These heaters consist of coils of the highest grade
resistance wire, insulated by ceramic insulators in alumi-
nized brackets.
3. Unless a single power-source option is selected, the elec-
tric heat units require 2 separate power sources. With the
single power-source option, only one line circuit need be
brought into the unit. Fuse protection is added to the motor/
control circuit to protect these components. This is sepa-
rate from the field-furnished total unit overcurrent protection.
All heaters except those used in 42S stack units are po-
sitioned on the incoming (preheat) side of the unit coil. On
MODEL 42C CEILING UNIT
WITH ELECTRIC STRIP HEATER
MODEL 42V VERTICAL UNIT
WITH ELECTRIC SHEATH HEATER
9
REMOTE-MOUNTED CONTROLS
Standard 3-Speed Switch — This standard switch
has 4 positions: OFF, HIGH, MEDIUM, and LOW. Switch
has auxiliary contact that is energized when switch is in HIGH,
MEDIUM or LOW position.
Some of the options common with the 3-speed switch are:
1. Unit-mounted switch on Furred-In Vertical Model. (Avail-
able as special order on Horizontal Models)
2. Switch without OFF position.
3. Key-operated switch.
Combination Thermostat/3-Speed Switch
(Packages 22-B, 22-D, 22-F, 22-H, 22-K*) — Thermostat
and standard switch are mounted on a common decorative
wall plate, suitable for installation in a 411⁄16-in. square junc-
tion box. Packages 22-A and 22-B include Model TC-126
2-pipe heating and cooling thermostat and automatic change-
over switch (shipped separately for field wiring and mount-
ing).
Packages 22-C and 22-D include Model TC-126 thermo-
stat less automatic changeover switch wired for cooling only.
Packages 22-E and 22-F include Model TC-126 thermo-
stat, less automatic changeover, wired for heating only.
70
60
80
Package 22-G includes Model TH-126 4-pipe thermostat
for sequenced heating and cooling, plus 3-speed switch. (For
4-pipe or total electric heat systems.)
50
90
Package 22-J is the same as 22-G except that 2 automatic
changeover switches are shipped with package. (For auxil-
iary electric heat systems.)
Wall Thermostat, 2-Pipe (Packages 22-A through
22-F*) — Model TC-126 thermostat for heating and cool-
ing, operates on line voltage. Action is SPDT. Temperature
range is 50-90 F.
Packages 22-A and 22-B — Heating and cooling, in-
cludes one automatic changeover switch (shipped separately
for field wiring and mounting).
70
60
80
Wall Thermostat, 4-Pipe (Packages 22-G through
22-K*) — Model TH-126 thermostat is also used on 2-pipe
system with electric heat. Heating and cooling are se-
quenced (automatic changeover) with 6 degree separation be-
tween HEATING ON and COOLING ON. Temperature range
is 50 - 90 F.
50
90
Packages 22-G and 22-H — For 4-pipe and total electric
heat systems.
Packages 22-J and 22-K — For auxiliary electric heat sys-
tems, includes 2 automatic changeover switches (shipped sepa-
rately for field wiring and mounting).
Thermostat Electrical Data
(Pilot Duty — 125 VA)
* Packages listed on current price pages.
HEATING
COOLING
VOLTS
FLA
LRA
34.8
29.4
24.6
FLA
5.8
4.9
4.1
LRA
34.8
29.4
24.6
120
240
277
5.8
4.9
4.1
10
ALTERNATE WALL THERMOSTATS
Wall Thermostat (Honeywell Model T4039) with
Manual 3-Speed Fan Switch and ON-OFF Switch
Temperature range is approximately 55 to 95 F in 10° F
increments from 75 F midpoint. Scale is marked warmer-
cooler. Thermostat mounts in 4-in. square junction box or
2-ganged outlet boxes.
W
ARM
FAN
SYSTEM
MODEL
T4039B*
T4039F*
T4039F*
T4039M**
T4039M**
T4039M**
PACKAGE
23-05
HI
MED
LO
2-Pipe Cooling Only
2-Pipe Heating Only
23-03
2-Pipe Heating/Cooling†
2-Pipe w/Total Electric Heat
4-Pipe Heating/Cooling
2-Pipe w/Auxiliary Electric Heat††
23-01
23-07
23-07
23-09
*Fan off breaks cooling circuit and fan.
†Includes one remote-mounted changeover on unit
**Fan off breaks both heating/cooling circuits and fan.
†† Includes 2 remote-mounted changeovers on unit.
NOTE: All above packages include thermostat, ON-OFF switch and HI-
MED-LOW switch.
OFF
ON
COOL
Thermostat Electrical Ratings (Amperes)
Thermostat (Valve Load)
HONEYWELL MODEL T4039
THERMOSTAT
VOLTAGE
NORMAL
IN-RUSH
120V AC
240V AC
277V AC
0.32
0.16
0.14
1.00
0.50
0.43
Fan Switch
VOLTAGE
FULL LOAD
LOCKED ROTOR
120V AC
240V AC
277V AC
5.50
2.75
2.40
33.0
16.5
14.4
Wall Thermostat (Sunne Model 154) with Manual
3-Speed Fan Switch and ON-OFF Switch
Temperature range is approximately 55 to 95 F in 10° F
increments from 75 F midpoint. Scale is marked warmer-
cooler. Thermostat mounts in 4-in. square junction box or
2-ganged outlet boxes.
SYSTEM
2-Pipe, Cooling Only
MODEL
PACKAGE
23-06
E
L
TC154-004
TC154-004
R
HEAT
2-Pipe, Heating Only
23-04
2-Pipe, Heating/Cooling
with Auto. Changeover*
OFF
TC154-004
TC154-014
TC154-003
TC154-014
TC154-003
TC154-014
TC154-003
TC154-014
23-02
23-12
23-08
23-14
23-10
23-16
23-08
23-14
COOL
2-Pipe, Heating/Cooling
with Manual Changeover
2-Pipe, Cooling with Total Electric
Heat and Auto. Changeover.
HI
2-Pipe, Cooling with Total Electric
Heat and Manual Changeover
F
A
N
MED
LO
2-Pipe, Heating/Cooling with Auxiliary
Electric Heat and Auto. Changeover†
2-Pipe, Heating/Cooling with Auxiliary
Electric Heat and Manual Changeover
4-Pipe, Heating/Cooling with
Auto. Changeover
4-Pipe, Heating/Cooling with
Manual Changeover
*Includes one remote mounted changeover on unit.
†Includes 2 remote mounted changeovers on unit.
NOTE: All of the above packages include thermostat, ON-OFF switch and
HI-MED-LOW switch.
SUNNE MODEL 154
THERMOSTAT
Thermostat and Fan Switch Electrical Ratings
INDUCTIVE
VOLTAGE
PILOT DUTY
FLA
LRA
125V AC
240V AC
277V AC
5.8
4.9
4.1
34.8
29.4
24.6
125 VA
125 VA
125 VA
11
UNIT-MOUNTED CONTROLS
MED
HI
OFF
COMBINATION THERMOSTAT AND TOGGLE SWITCH
Combination Thermostat/ON-OFF Toggle Switch
(Package 24-R*) — Includes Model TF103 2-pipe thermo-
stat and toggle switch. Used as special fan control for cy-
cling fan from HIGH to LOW on cooling; from LOW to
OFF on heating.
Standard 3-Speed Switch — Switch has OFF, HIGH,
MED and LOW positions. Switch is also equipped with aux-
iliary connection energized when switch is in HIGH, MED
or LOW position.
Combination Thermostat/3-Speed Switch (Pack-
ages 24-L, M, N, P and Q*) — Thermostat and standard switch
are unit mounted in a common electrical junction box.
Package 24-L includes Model TF103 2-pipe thermostat
and standard 3-speed switch, plus automatic changeover for
mounting on supply pipe.
Package 24-M and 24-N include Model TF103 2-pipe ther-
mostat and standard 3-speed switch only.
Package 24-P includes Model TH104 4-pipe thermostat
and standard 3-speed switch. May be used on 4-pipe sys-
tems with electric valves or on 2-pipe systems with total elec-
tric heat.
Package 24-Q includes Model TH104 4-pipe thermostat,
standard 3-speed switch and 2 automatic changeover switches
for 2-pipe systems with auxiliary electric heat.
* Packages listed on current price pages.
12
Two-Pipe Thermostat, Model TF103 — This single-
pole, double-throw (SPDT) thermostat has snap-action con-
tacts. The standard temperature range is 60 - 90 F.
Four-Pipe Thermostat, Model TH104 — With this
thermostat, heating and cooling are sequenced (automatic
changeover) with 6 degree separation between HEATING
ON and COOLING ON. The standard temperature range is
60 - 90 F.
Thermostat Electrical Data
(Pilot Duty — 125 VA at 120-277 v)
ITEM
VOLTS
FLA
LRA
TF103
and
TH104
120
240
277
16
12
10
80
60
50
Automatic Changeover (Summer-Winter Switch) —
The automatic-changeover thermostat is a single-pole double-
throw (SPDT) thermal switch in a moistureproof and dust-
proof enclosure. Thermostat mechanism and lead ends are
hermetically sealed in a polypropylene enclosure with ep-
oxy resin. Device clamps on coil supply pipe with end snap-on
clip.
The set point temperatures are factory set. When water
temperature rises above 80 F (approximately), the thermo-
stat switches to the winter cycle. When water temperature
drops below approximately 70 F, the thermostat switches to
the summer cycle. Switch reset is automatic.
STEMCO
416-79
L80 8220
AUTOMATIC CHANGEOVER (Summer-Winter) SWITCH
13
BASIC DEFINITIONS
Unit Hand — When facing the supply air outlet from the front of the unit (air blow-
ing in your face), your right hand will be the right hand side of the unit and your left
hand the left hand side of the unit.
Same End Connection (2 Pipe or 4 Pipe) — All piping connections are on the same end (side) of the unit. Controls
and electrical connection will be on the end (side) opposite the piping connection.
Standard 2-pipe units will be the same end connection.
NOTE: Piping determines the hand of the unit.
Opposite End Connection (4-Pipe Option) — Hot water (HW) piping connections and electrical will be on the end
(side) opposite the chilled water (CW) and drain connections.
NOTE: Chilled water piping determines the hand of the unit.
Valve Packages For 2-Pipe Systems — Valve packages for standard 2-pipe
units are piped for same end connection (L.H. or R.H.).
Valve Packages for 4-Pipe Systems - Select 2 valve packages per unit.
NOTE: Hot water valve package requirements may not be the same as chilled water valve package!
14
Hydronic Coil Arrangement
FIELD PIPING CONNECTIONS*
VERTICAL FLOOR UNITS — 42VB, VE, VF
Pipe into cabinet end compartment
(opening in bottom and back).
VERTICAL FLOOR UNITS — 42VA, VC
Pipe to external connections (no cabinet).
CEILING UNITS (EXPOSED) — 42CG, CK,
DE, DF
Pipe through knock-outs in rear of cabinet to
coil and valve package connections.
CEILING UNITS (CONCEALED) — 42CA,
CE, CF, DA, DC
Pipe to connections extending from end of
unit.
VERTICAL UNITS — 42DD
Pipe to stub connections extending from side
of unit.
HORIZONTAL AIR HANDLERS (BELT
DRIVE) — 42BH
Pipe to stub connections extending through
side of unit.
Valve packages are not factory supplied with
these units.
WALL UNITS, FURRED-IN
Pipe to stub connections at the side of unit.
or into optional piping compartment. Op-
tional piping compartment is required if valves
are factory installed. Factory installed valve
package is limited to one 2-way or 3-way mo-
torized valve and 2 hand valves.
*Location of field piping connections will vary depending on number of coil rows on factory-
supplied coil or arrangement of factory-supplied valves.
15
VALVE PACKAGES
Valve packages are shipped with the units or in unit car-
tons. Valve packages include belled ends for field soldering
to coil connections.
All factory-furnished cooling valve packages are ar-
ranged to position as much of the package as possible over
an auxiliary drain pan or drip lip. This helps minimize field
piping insulation requirements.
General — Table 1 lists acceptable pneumatic valves for
installation on 42 series fan coil units. There are limitations
on physical size of pneumatic valves, quantity and type of
matching components, required control interface. See Fig. 1
for symbols and placement of valves.
Consult factory before ordering any special valve pack-
age components that are not covered in this book.
Fig. 1 — Symbol And Placement Of Valves
16
LEGEND For Fig. 1
1
5
3
7
Component Sizing — ⁄2Љ nominal (for ⁄8Љ OD copper tubing) or ⁄4Љ nominal (for ⁄8Љ OD copper tubing).
Manual Air Vent — Standard component - Brazed into high point of hydronic cooling and/or heating coil circuit.
Automatic Air Vent — Brazed into high point of coil circuit.
Coil Connections (Positions A & B) — When isolation valve only is added to supply or return line, the isolation valve
will be factory brazed to the coil stub-out. Addition of any other component or connection to the supply or return line
will change the respective coil connection(s) to one of the following:
STANDARD: Swage fitting for field braze.
OPTION: Union(s) added by factory for field connection.
Service Fittings (Positions C & D) — Optional fittings for attaching pressure/temperature sensing devices to obtain
pressure drop or temperature differential accross coil. Used with ball valve or balance valve where extremely accurate
water flow balancing is required.
GAGE COCK: Pressure test only - In supply and return lines.
PRESSURE TEST PORT: Pressure test only - In supply and return lines.
INSERTION TEST PORT: Pressure/Temperature test - In supply and return lines.
Water Flow Balancing (Positions E, F, & H) — Only one device per total valve package to be used for balancing
water flow through the coil. When isolation valve (ball valve or ball valve with memory stop at position H) is used for
water flow balancing, do not specify additional balancing device at position E or F. When balancing device is specified
at position E or F, isolation valve does not require balancing feature at position H (See exception, 3-way motorized
valve).
CIRCUIT SETTER: May serve as a positive shut-off valve in lieu of isolation valve at position H
(check service requirements).
BALANCING VALVE: Check specifications for service fitting requirements.
FIXED FLOW: No balancing required - When there are more devices on the supply line of the valve
package than on the return line, the factory may move this device to position E to fit valve package
within allotted space. Consult your factory representative to match the available fixed flow valve to your
job requirements.
Strainer (Position G) — Does not include blow down fitting and should not be used in lieu of main piping strainers.
Isolation Valves (Positions H & J) — Normally requires one each on supply and return line (see exception under
circuit setter). When position H is used for balancing (ball vall or ball valve with memory stop), check specifications for
service valve requirements.
GATE VALVE: Shut-off only - Do not use for balancing.
BALL VALVE: Shut-off/balance - No memory stop.
BALL VALVE WITH MEMORY STOP: Shut-off/balance - Memory stop allows re-opening to balance point
after usage as a shut-off.
17
VALVE PACKAGES (cont)
Two-Way Motorized Control Valve
The 2-way motorized valve motor drives valve open
and a spring returns valve to normally closed position
(no water flow with unit OFF).
Supply connection at coil will be swage fit for field braze
(standard) or union (option). Return connection at coil
will be factory brazed if isolation valve only. Addition of
any other component will require swage fit for field braze
or optional union connection.
Check job specifications for system pressure, pres-
sure drop limitations and flow rate prior to selecting valve
3
package components or valve package size (1⁄2Љ, ⁄4Љ,
etc.).
2-PIPE SYSTEM (One Valve Package) or 4-PIPE SYS-
TEM (Two Valve Packages) Application:
• 2 Pipe - Hydronic Heating Only
• 2 Pipe - Hydronic Cooling Only
• 2 Pipe - Hydronic Cooling with Total Electric Heat
• 4 Pipe - Hydronic Cooling and Heating
NOTE: A1⁄4-in. bypass line is included in the piping pack-
age when a 2-way valve is specified with a control pack-
age containing an automatic changeover device.
Two-Way Motorized Control Valve with
Aquastat Bleed Bypass Line
The 2-way motorized valve motor drives valve open
and a spring returns valve to normally closed position
(no water flow through coil with unit OFF).
The aquastat bleed bypass bleeds a small amount of
water from supply to return when control valve is closed
(required for system water temperature sensing by aqua-
stat). Aquastat (A) clips on supply line upstream from
aquastat bleed bypass (as shown at right). It senses
system water temperature to prevent cooling operation
with hot water in system piping or heating operation with
chilled water in system piping. Additional aquastat re-
quired to lock out the optional auxiliary electric heat when
hot water in system.
Supply and return connections at coil will be swage fit
for field braze (standard) or unions (option).
Check job specifications for system pressure, pres-
sure drop limitations and flow rate prior to selecting valve
3
package components or valve package size (1⁄2Љ, ⁄4Љ,
etc.).
2-PIPE SYSTEM (One Valve Package) Application:
• 2 Pipe - Hydronic Cooling and Heating
• 2 Pipe - Hydronic Cooling and Heating with Auxiliary
Electric Heat
NOTES: Additional aquastat required as noted above.
18
Three-Way Motorized Control Valve
On the 3-way motorized valve flow is normally closed
to coil and open to system return. Motor closes bypass
flow to system return while opening flow through coil.
Water bypasses coil and flows directly to system return
when unit is OFF.
The aquastat (A) clips on supply line upstream from
3-way valve (as shown above). It senses system water
temperature to prevent cooling operation with hot wa-
ter in system piping or heating operation with chilled wa-
ter in system piping. Aquastat(s) required for 2-pipe cooling
and heating with automatic changeover control and/or
auxiliary electric heat.
A bypass balancing valve may be specified in the by-
pass line to permit equal flow balancing.
Supply and return connections at coil will be swage fit
for field braze (standard) or unions (option).
Check job specifications for system pressure, pres-
sure drop limitations and flow rate prior to selecting valve
3
package components or valve package size (1⁄2Љ, ⁄4Љ,
etc.).
2-PIPE SYSTEM (One Valve Package) or 4-PIPE SYS-
TEM (Two Valve Packages) Application:
• 2 Pipe - Hydronic Heating Only
• 2 Pipe - Hydronic Cooling Only
• 2 Pipe - Hydronic Cooling with Total Electric Heat
• 2 Pipe - Hydronic Cooling and Heating
• 2 Pipe - Hydronic Cooling and Heating with Auxiliary
Electric Heat
• 4 Pipe - Hydronic Cooling and Heating
No Motorized Control Valve
When isolation valves only are specified, they will be
brazed to the coil stub-outs.
Check job specifications for system pressure, pres-
sure drop limitations and flow rate prior to selecting spe-
cific components or valve package size (1⁄2Љ, 3⁄4Љ, etc.).
2-PIPE SYSTEM ONLY (One Valve Package)
Application:
• 2 Pipe - Hydronic Heating Only
• 2 Pipe - Hydronic Cooling Only
NOTES:
1. Continuous water flow, chilled water or hot water.
2. Not recommended for high humidity applications.
3. Not recommended with unit-mounted thermostat on
vertical units (except package R).
4. The addition of any other component(s) will require
swage fitting for field braze or optional union conec-
tion.
19
VALVE PACKAGE ARRANGEMENTS
20
LEGEND
—
—
—
—
—
Ball Valve
Ball Valve with Memory Stop
Gate Shut Off Valve
Balancing Valve
Circuit Setter
—
—
Motorized 2-Way Valve
Motorized 3-Way Valve
* When aquastat is used for automatic changeover, bypass is re-
quired as indicated by dashed line.
NOTES:
1. Packages factory furnished and installed.
5
2. Valves are
⁄
8-in. ODS unless otherwise specified.
3. If an automatic flow control valve is added, it will be located on
supply line between shutoff valve and coil (or motorized control
valve, if supplied).
4. Packages are listed on current price pages.
21
VALVE PACKAGE ARRANGEMENTS (cont)
LEGEND
ITEM
DESCRIPTION
Pneumatic Control Valve, 2-Way
5
Code 18(typical) -2* (1⁄2- or
⁄
8-in. ODF tubing conn) or
Code 18(typical) -3* (7⁄8-in. ODF tubing conn)
Pneumatic Control Valve, 3-Way
5
Code 18(typical) -14* (1⁄2- or
⁄
8-in. ODF tubing conn) or
Code 18(typical) -5* (7⁄8-in. ODF tubing conn)
*Valve packages listed on current price pages.
NOTES:
1. Pneumatic valves are field furnished for factory installation.
2. To simplify valve installation and maintenance, cabinet units with
4-pipe coils must have opposite-end connections.
3. Alternate designations for the terms N.O., N.C. and RETURN on
3-way valves are as follows:
Manufacturer
Barber-Coleman
Honeywell
N.O.
B
N.C.
A
Return
AB
AB
C
B
A
Johnson Service
Powers
N.O.
B
N.C.
U
C
4. All orders entered must include a job specific piping diagram OR
reference can be made to standard arrangements 18-A through
18-E as shown here.
5. Hand valves shown in Arrangements 17-A through 17-F may be
included with pneumatic valves. These arrangements should also
be shown on piping diagrams submitted.
22
Table 1 — Acceptable Field-Furnished Pneumatic Valves
SIZE (in.)
(OD Male Flare)
CAPACITY
(CV) RATING
MANUFACTURER
VALVE NUMBER
TYPE
MODE
7
VP517A
VP522A&B
VP526A
3-WAY
3-WAY
3-WAY
2-WAY
2-WAY
2-WAY
2-WAY
3-WAY
3-WAY
3-WAY
3-WAY
2-WAY
2-WAY
3-WAY
3-WAY
2-WAY
2-WAY
3-WAY
3-WAY
3-WAY
2-WAY
2-WAY
2-WAY
2-WAY
3-WAY
2-WAY
2-WAY
3-WAY
3-WAY
MIXING
SEQUENCING
MIXING
N.O.
⁄
8
3.0, 4.0, 6.3
1.6/2.5 or 2.5/3.5/4.0
1.6, 2.5
5
7
⁄
⁄
8
8
or
⁄
⁄
8
5
⁄
⁄
8
1
HONEYWELL
VP527A
2
0.63, 1.0, 1.6
2.5, 4.0
5
7
VP513A
N.O.
or
8
5
VP513B
N.C.
⁄
8
1.0, 1.6, 2.5
1.6, 2.6, 3.3
1.2, 2.0
5
7
VP531A
N.O.
⁄
8
or
⁄
8
(ODS)
1
5
1
5
1
1
5
5
5
5
1
1
1
1
1
1
1
1
V4332
MIXING
MIXING
SEQUENCING
SEQUENCING
N.O.
⁄
⁄
⁄
⁄
⁄
⁄
⁄
⁄
⁄
⁄
⁄
⁄
⁄
⁄
⁄
⁄
⁄
⁄
2
8
2
8
2
2
8
8
8
8
2
2
2
2
2
2
2
2
V4334
4.7
V4440
1.4, 2.4
JOHNSON
SERVICE
V4440
4.1, 4.7
V3766
1.0, 1.7, 3.2
1.7, 3.2
V3966
N.C.
VK9312
MIXING
SEQUENCING
N.O.
2.0, 4.0
VK9332
1.7, 2.4, 4.0
0.4, 1.3, 2.2, 3.3
0.4, 1.3, 2.2, 3.3
1.5, 2.5
BARBER-
COLEMAN
VK9212
VK9222
N.C.
VP656-0011, 10, 09
VP658-0004, 5
VP658-0050, 51
VP658-0004, 5
VP656-0002, 4
VP656-0012
2582 (V8200)
2583 (V8300)
2561 (V6101)
2561 (V6102)
2563 (V6300)
2563 (V6301)
MIXING
DIVERTING
SEQUENCING
N.O.
2.5
1.5, 2.5
MCC
POWERS
1.0, 2.5
N.O.
0.9, 2.1
N.C.
2.1
N.O.
0.4, 0.6, 1.0, 1.6
1.6
MIXING
N.C.
1
5
⁄
2,
⁄
8
1.2, 2.2, 4.1
1.0, 1.6
1
1
5
N.O.
⁄
⁄
⁄
2
2
8
ROBERTSHAW
MIXING
MIXING
1.6
2.5
.6, 1.0, 1.1, 1.6,
2.5, 3.2, 2.4, 4.0, 4.5
1
5
7
2569 (V6900, 01)
3-WAY
SEQUENCING
⁄
2,
⁄
8,
⁄
8
5. The C capacity rating is the gpm flow through a valve at 1.0 psi
V
C
—
—
—
—
See Note 5.
V
pressure drop.
N.C.
N.O.
OD
Normally Closed
Normally Open
Outside Diameter
EXAMPLE: A 2.5 C valve has a flow of 2.5 gpm at 1.0 psi pres-
V
sure drop.
As flow changes, pressure drop can be determined by the
formula:
NOTES:
1. This reference table lists valves that are acceptable because of
capacity and piping connection type. Actual valve selection for spe-
2
Actual gpm
P =
cific mode (N.O. or N.C.) and capacity rating (C ) to meet jobsite
V
C
V
conditions must be made by field personnel.
6. Restrictions imposed by limited piping enclosures often require that
the valve manufacturer’s recommendation for obstruction free serv-
ice clearances be waived. Service/isolation valves normally speci-
fied will permit removal of the entire pneumatic valve for field serv-
ice if necessary.
7. Certain combinations of piping accessories and control valves have
proven unacceptable in the past, therefore the factory must re-
serve the right of review for final acceptance.
8. Consult factory on all applications involving valves with thermo-
static actuators or built in pneumatic thermostats.
2. Valve size (1⁄2-,
ing size.
⁄
8-, and ⁄8-in. OD) designates the matching tub-
5
7
Use price page package 18-2 or 18-4 for selecting 1⁄2-in. or 5⁄8-in.
7
OD valves. Use price page package 18-3 or 18-5 for
valves.
⁄8-in. OD
3. The 1⁄2-in. and 5⁄8-in. OD valves are used primarily on 42C (ceiling)
7
and 42V (vertical) room fan coil units. The
⁄8-in. OD valves are
recommended for use on 42D (ducted) units.
4. Flare connections are 45° SAE flare with body threaded for stand-
ard flare nuts.
23
PIPING COMPONENTS
C
FACTOR
RATING
V
STEAM
USE
SYMBOL/SKETCH
DESCRIPTION
1
3
⁄
2
⁄
4
PSI
F
MANUAL AIR VENT: Threaded brass
needle valve with screwdriver slot
for adjustment.
Application - Body brazed into high
point of heating and cooling coils for
bleeding air from coil. Standard item
on all hydronic coils (not used on
steam or DX coils). Should not be used
in lieu of main system air vents.
N/A
N/A
400
100
NO
AUTOMATIC AIR VENT: Nickel
plated brass valve, fiber-disc type, with
positive shut-off ballcheck and quick
vent feature via knurled vent screw.
Application - Optional replacement for
manual air vent. Automatically passes
minute quantities of air through the
fiber discs which expand upon contact
with water, completely sealing the
valve. As air accumulates, the fiber
discs dry and shrink, repeating the
cycle. Not recommended for removing
large quantities of air encountered
during initial start-up or subsequent
draining and refilling. Should not be
used in lieu of main system air vents.
N/A
N/A
125
240
NO
SWAGE: Copper tube end expanded
to accept a copper tube of the same
size for factory or field brazing.
Application - Used where possible for
all tubing joints for best joint integrity.
300
(*)
200
(*)
N/A
N/A
YES
(*) See page 30 for ratings of different
joining materials and operating
temperatures.
UNION: Combination wrought
copper/cast brass union assembly,
solder by solder.
Application - Used for quick connect
(and disconnect) of valve package
components to minimize field labor
and facilitate servicing of unit.
300
(*)
200
(*)
N/A
N/A
YES
(*) See page 30 for ratings of different
joining materials and operating
temperatures.
INSERTION TEST PORT: Brass body
valve for acceptance of test probe (up
1
to ⁄8 in. diameter).
Application - Installed on one (or both)
sides of the coil to allow for temperature
or pressure sensing. Used for close
tolerance water balancing and
service analysis.
N/A
N/A
250
250
NO
24
C
FACTOR
RATING
V
STEAM
USE
SYMBOL/SKETCH
DESCRIPTION
1
3
⁄2
⁄
4
PSI
F
PRESSURE TEST PORT: Brass body
1
⁄
4
service access fitting with
removable depressor type core.
N/A
N/A
N/A
N/A
400
200
210
NO
Application - Installed on both sides of
the coil to allow for pressure sensing.
Attach pressure gages to facilitate
close tolerance water balancing.
GAGE COCK: Brass shut-off valve
1
with ⁄4 FPT fitting for attachment of
pressure gages.
Application - Installed on both sides of
the coil to allow for pressure sensing.
Attach pressure gages to facilitate
close tolerance water balancing. May
be used in bleed bypass line to
regulate water flow.
250
N/A
CIRCUIT SETTER: Variable water
flow balancing valve with manual
adjustment knob, pointer, percent-open
scale, memory stop and integral
pressure read-out ports.
B + G
1.95
4.15
200
250
NO
Application - Used for close tolerance
water flow balancing. Positive shut-off
ball valve feature allows usage as com-
bination balancing and shut-off valve.
BALANCE VALVE: Variable water
flow manual balancing valve with
screwdriver slot adjustment screw.
Application - Often used in conjunction
with test port fittings for water flow
balancing. Balance by temperature
differential or coil pressure drop (check
specifications for service fittings
3.0
8.9
150
200
NO
required if balancing by pressure drop).
May be used in 3-way valve bypass
line to permit equal flow balancing.
FLOW SETTER: Variable water flow
manual balancing valve with
screwdriver slot adjustment and direct
gpm read-out sight glass.
2.2
5.4
125
125
210
240
NO
NO
Application - Used for water flow
balancing (8.0 gpm maximum).
FIXED FLOW VALVE: Spring and
insert type (non-adjustable).
Valve orifice size
determines C
factor. The orifice
of these fixed flow
valves changes as
flow is regulated.
As the water
V
Application - Used for water flow
balancing. Valve automatically adjusts
the flow to within 10% of set point. Not
available for flow rates above 8 gpm.
pressure increases,
the orifice size
decreases, thereby
automatically
FIXED FLOW VALVE: Flexible orifice
type (non-adjustable).
HAYES
Application - Used for water flow
balancing. Valve automatically adjusts
the flow to within 10% of set point.
Requires 15 psi (35 ft) of additional
pump head for proper operation.
150
160
NO
limiting the flow
rate to the
specified gpm
(+/Ϫ10%).
25
PIPING COMPONENTS (cont)
C
FACTOR
RATING
V
STEAM
USE
SYMBOL/SKETCH
DESCRIPTION
1
3
⁄2
⁄
4
PSI
F
STRAINER: Y-type body with
50 mesh stainless steel screen.
Application - Used for removal of small
particles from system water during
normal system operation. Should not
be used in lieu of main system
strainers. Strainer screen may have to
be removed during initial high pressure
system flushing during start-up.
Screen should be removed and cleaned
per normal maintenance schedule
(provisions for strainer blow-down
not provided).
9.0
Clean
19.0
Clean
400
250
N/A
GATE VALVE: Manual shut-off valve.
Application - Used for unit isolation
during system flushing, servicing, etc.
Do not use for water balancing.
19.8
1.8
36.0
3.9
200
200
200
200
NO
NO
GLOBE VALVE: Standard pattern,
manual shut-off and throttling valve.
Application - Used for unit isolation.
Not recommended for high flow rates
due to relatively high pressure drop.
COMPRESSION STOP VALVE:
Manual shut-off valve.
Application - Used for unit isolation
during system flushing, servicing, etc.
Not recommended for high flow rates
due to relatively high pressure drop.
2.3
4.0
5.4
7.5
150
400
200
200
NO
BALL VALVE: Manual balance and
shut-off valve.
Application - Used for unit isolation
and water flow balancing. Without
memory stop feature water balance
point must be marked by installer (if
necessary). Check specifications for
service fittings required when used for
water balancing.
YES
BALL VALVE WITH MEMORY STOP:
Manual balance and shut-off valve.
Application - Used for unit isolation
and water flow balancing. The adjust-
able memory stop feature allows return
to the balance point after shut-off.
Check specifications for service
fittings required when used for
water balancing.
4.0
7.5
400
200
N/A
26
C
FACTOR
RATING
STEAM
USE
V
2
SYMBOL/SKETCH
DESCRIPTION
1
3
⁄
⁄
4
PSI
F
2-WAY MOTORIZED VALVE: Electric
2-position flow control valve
(open/closed). Normally-closed body
with manual override lever. Installed in
supply line to unit.
Application - All standard control and
valve packages are based upon
normally-closed valves (valve
electrically powered open and closed
by spring return when electric power
removed). Manual override lever allows
valve to be placed in the open position
for secondary (unit) flushing, constant
water flow prior to start-up, etc.
YES
15
2.3
2.3
300
200
PSI
MAX.
Manual override is automatically
disengaged when valve is electrically
activated. Consult factory for
normally-open valve applications.
3-WAY MOTORIZED VALVE: Electric
2-position flow control valve (closed to
coil/open to bypass or open to coil/
closed to bypass). Normally-closed
with manual override lever. Installed in
supply line to unit.
5.0
5.0
2.8
SERVICE
300
200
N/A
Application - Same comments as
2-way motorized valve except with
manual override lever engaged the
valve is open to both ports and water
flow will take the path of least
resistance through the valve package
(not necessarily 100% through the coil).
2.8
BYPASS
2-WAY PNEUMATIC VALVE:
Pneumatic operated 2-way
control valve.
Application - Specified and supplied by
others when required as part of a
factory-assembled valve package.
See Table 1 for approved listing of
pneumatic valves suitable for
SPECS VARY WITH SUPPLIER
installation on various unit models.
3-WAY PNEUMATIC VALVE:
Pneumatically operated 3-way
control valve.
Application - Specified and supplied
by others when required as a part of a
factory-assembled valve package.
See Table 1 for approved listing of
pneumatic valves suitable for
SPECS VARY WITH SUPPLIER
installation on various unit models.
AQUASTAT: Water temperature
sensing electrical switch.
Application - Clips directly on nominal
1
3
size ⁄2Љ or ⁄4Љ copper tubing for
water temperature sensing. Must be
correctly located for proper control
operation.
NOTES:
1. Motorized 2-way valves have a maximum close-off differential of 25 psi.
2. Motorized 3-way valves have a maximum close-off differential of 10 psi.
27
C
V
FACTOR vs WATER PRESSURE DROP
C
V
FACTOR:
The flow rate in gallons per minute (gpm) through a piping component when the pressure drop (⌬P) in pounds per
square inch (psi) across the component is 1.0 (psi).
Pressure drop (ft-H2O) = 2.31 x psi (pressure drop)
GRAPH EXAMPLE:
⌬P for 2.0 gpm through a component with a CV of 1.0 is 4.0 psi x 2.31 = 9.24 ft-H2O
FORMULA EXAMPLE:
(gpm)2
(Cv)2
(2.0)2
(1.0)2
⌬P (ft-H2O) =
x 2.31 =
x 2.31 = 9.24 ft-H2O
TOTAL PRESSURE DROP is the Sum of the pressure drop of all piping and components in the water flow path.
28
29
COPPER WATER TUBE AND JOINT MATERIAL PRESSURE RATINGS
JOINT MATERIALS
A
B
C
50-50 Lead-Tin at 200 F
50-50 Lead-Tin at 150 F
50-50 Lead-Tin at 100 F
D
E
F
95-5 Tin-Antimony at 200 F
95-5 Tin-Antimony at 150 F
95-5 Tin-Antimony at 100 F
Note 1
Note 2
1. Not recommended for high system water pressures.
2. Standard factory joint material.
THE ABOVE CHART IS FOR REFERENCE ONLY: Check all system component pressure ratings (coils, valves, pumps, etc.)
and any applicable local or national piping codes prior to specifying system pressure rating.
30
CORRECTION FACTORS FOR GLYCOL
(Equivalent water flow method for all 42 Series Models)
This method allows you to calculate cooling and heating performance without adjusting capacities for glycol
concentration.
After completing the standard selection procedure including water flow rates, use the correction multiplier shown below
to determine new (equivalent) flow rates required for the specified glycol concentration.
EXAMPLE:
COOLING PERFORMANCE REQUIRES 3.0 gpm of 100% WATER.
What flow rate of 30% glycol by voume will be required to match the cooling performance? Referring to the
chart above, you will note that the cooling flow rate multiplier for 30% glycol is 1.14.
100% WATER (3.0 gpm) x 1.14 = 3.42 gpm of 30% GLYCOL (EQUIVALENT FLOW RATE)
What will the new pressure drop be for 3.42 gpm of 30% glycol? Referring to the chart above, you will note
that the cooling pressure drop multiplier for 30% glycol is 1.27.
(A) Obtain pressure drop for 3.42 gpm of 100% water.
(B) Multiply (A) times 1.27 to obtain pressure drop for 3.42 gpm of 30% glycol.
31
Table 2 — Standard Accessories and Options
UNIT SERIES — 42
STANDARD ACCESSORIES
AND OPTIONS
Belt
Drive
Ceiling — Horizontal
Floor — Vertical
Ducted — Horizontal
Stack — Vertical
CA CE CG CK CF VA VB VF VC VE
VG
DA DC DE DF DD BH
SG
SH
SJ
CABINET CHANGES
Front Panel, 16 Gage
•
•
Extended Cabinet when electric
heat or valves are installed
•
•
•
•
•
•
Valve Compartment Extension, 10 in.
Stamped Toe Space Return Grille
CLEANABLE FILTERS
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
COILS
3-Row (2-row cooling, 1-row heating)
•
•
•
•
3-Row (high capacity)
4-Row (3-row cooling, 1-row heating)
4-Row (high capacity)
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
Std
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
Std Std Std Std Std Std
5-Row (4-row cooling, 1-row heating)
5-Row (3-row cooling, 2-row heating)
6-Row (4-row cooling, 2-row heating)
6-Row (high capacity)
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
7-Row (6-row cooling, 1-row heating)
8-Row (6-row cooling, 2-row heating)
DAMPERS
Manual — Adjustable through return
air opening
•
•
•
•
•
•
Manual Adjustment, remote mounted
Manual — Rear opening with
sliding damper — not filtered
•
•
Outdoor Air Connection (6 in.),
with filter and with or without
damper
•
•
•
•
•
Damper, Linkage and Motor wired to
auxiliary contact of 3-speed switch
•
•
•
•
•
DECORATIVE COLORS
(See Carrier Fan Coil Paint
Selector Guide)
•
•
•
•
•
•
•
•
DISCHARGE GRILLES
Stamped Front Discharge
•
•
•
•
Std
Double Deflection, installed
Double Deflection, shipped
loose
•
•
•
•
•
•
•
•
•
•
Reverse stamped for vertical discharge
•
•
DRAIN PANS
Auxiliary Drip Lip — Included with
2- or 3-way motorized valves
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
Tell-Tale, with 2nd drain connection
Sleeved Steel Extension
•
•
ELECTRIC HEATERS
Nichrome Wire Strip Heater
•
•
•
•
•
•
•
•
•
•
•
•
•
Sheath Type Heater
•
•
•
•
•
•
•
•
•
•
LEVELING LEGS
(maximum adjustment,
3
⁄4
in.)
MOTORS
115-1-60 PSC
Std Std Std Std Std Std Std Std Std Std
Std Std Std Std Std
Std Std Std
208-1-60 PSC
240-1-60 PSC
277-1-60 PSC
115/230-1-60
220/440-3-60
220-1-50 PSC
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
MOTOR QUICK-DISCONNECT PLUG
OUTSIDE-AIR WALL BOX
•
•
RETURN AIR GRILLE, shipped loose
•
•
•
•
•
•
TAMPERPROOF LOCKS (Camloc)
Access Panels
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
Access Doors
VALVE PACKAGES
•
•
•
•
•
•
•
•
•
•
•
Limited
Limited
•
•
•
•
•
•
•
•
•
•
•
•
•
•
WALL PANELS (for recessed unit)
WIRING PACKAGES
•
•
•
Copyright 1990 Carrier Corporation
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Book 3
PC 201
Catalog No. 514-203
Printed in U.S.A.
Form 42-3XC
Pg 32
6-90
Replaces: 42-2XC
Tab 7a
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