Installation, Operation, and
Maintenance
Midrange Self-Contained Units
Models SCWH/SCRH
3, 5, 7.5, 10, 12, & 15-tons
“AO” and later design sequence
PKG-SVX14A-EN
October 2008
contents
Cross reference to related publications/information:
Midrange Self-Contained catalog, PKG-PRC012-EN
Installation…………………………………………………2
general information ……………………………………………2
pre-installation considerations ………………………………6
dimensions & weights ………………………………………11
mechanical requirements ……………………………………17
electrical requirements ………………………………………19
installation procedure ………………………………………21
pre-startup requirements ……………………………………22
startup …………………………………………………………23
Operation…………………………………………………24
sequence of operation ………………………………………24
Maintenance ……………………………………………25
general information …………………………………………25
maintenance procedures ……………………………………26
periodic checklists ……………………………………………29
troubleshooting ………………………………………………30
typical wiring diagrams ……………………………………32
PKG-SVX14A-EN
3
general
information
Installation
Midrange Model Number Description
Following is a complete description of the midrange model number. Each digit in the model number has a corresponding code that
identifies specific unit options.
S C W H 075 4
567 8
2
9
A0
1
0
1
0
1
2
3
4
1011 12 13 14 15
Digit 14 - unit finish
1 = painted
Digit 8 - unit voltage
Digit 1 - unit model
3 = 208 - 230 volt/60 hz/3 ph
4 = 460 volt/60 hz/3 ph
5 = 575 volt/60 hz/3 ph
2 = corrosion resistant coating
S = self contained
Digit 15 - coil finish/Cu-Ni Condenser
0 = none
E = evaporator coated (SCRH)
J = Cupronickel condenser &
Evaporator coated (SCWH)
Digit 2 - unit type
C = commercial
Digit 9 - air flow configuration
2 = vertical discharge / front return
3 = vertical discharge / rear return
Digit 3 - condenser medium
R = remote air-cooled
W = water cooled
Digit 10, 11 - design sequence
A0 = design sequence
Digit 4 - development sequence
H = development series
Digit 12 - air filter type
1 = one-inch fiberglass throwaway
Digit 5, 6, 7- unit nominal capacity
030 = 3 tons
Digit 13 - control
0 = control interface
050 = 5 tons
075 = 7.5 tons
100 = 10 tons
120 = 12 tons
150 = 15 tons
Unit Airflow Configurations
unit size
discharge
fanlocation
comments
030/050/075
vertical CCW
horizontalCW
top
top
standard
fieldconverted
100/120/150
vertical CCW
top
standard
vertical CW
horizontalCW
vertical CW
horizontalCW
horizontalCCW
top
top
rear
rear
rear
fieldconverted
4
PKG-SVX14A-EN
general
information
Installation
General
The midrange models SCWH/SCRH
is a high efficiency, vertical air
condioner. units have either front or top
discharge configuration options and easy
service access. Unit construction is heavy
gage steel with a baked enamel finish.
Available unit voltages are 208/3/60, 230/
3/60, 460/3/60, and 575/3/60.
refrigerants as a trace gas. Perform
evacuation prior to charging with a
vacuum pump capable of pulling a
vacuum of 1,000 microns of mercury or
less. Let the unit stand for 12 hours and
with the vacuum not rising above 2,500
microns of mercury.
Refrigerant Handling
Procedures
Environmental Accountability Policy
Trane urges that all HVAC servicers to
make every effort to eliminate, if possible,
or vigorously reduce the emission of CFC,
HCFC, and HFC refrigerants to the
atmosphere. Always act in a responsible
manner to conserve refrigerants for
continued usage even when acceptable
alternatives are available.
A rise above 2,500 microns of mercury
indicates a leak test is required to locate
and repair any leaks. A leak test is
required on any repaired area.
Refrigeration Circuits
Units are configured in single or double
refrigeration circuits. Each circuit consists
of:
Charge refrigerant into the equipment
only after equipment does not leak or
contain moisture. Reference proper
refrigerant charge requirements in the
maintenance section of this manual to
ensure efficient machine operation.
When charging is complete, purge or
drain charging lines into an approved
refrigerant container. Seal all used
refrigerant containers with approved
closure devices to prevent unused
refrigerant from escaping to the atmo-
sphere. Take extra care to properly
maintain all service equipment directly
supporting refrigerant service work such
as gauges, hoses, vacuum pumps, and
recycling equipment .
Recover and Recycle Refrigerants
Never release refrigerant to the
atmosphere! Always recover and/or
recycle refrigerant for reuse,
reprocessing (reclaimed), or properly
dispose if removing from equipment.
Always determine the recycle or reclaim
requirements of the refrigerant before
beginning the recovery procedure.
Obtain a chemical analysis of the
refrigerant if necessary. Questions about
recovered refrigerant and acceptable
refrigerant quality standards are
addressed in ARI Standard 700.
• high efficiency scroll compressor
mounted on rubber isolation grommets
• evaporator coils designed for optimum
performance and efficiency with lanced
fins and rifled tubing
• filter-drier
Evaporator Section
The evaporator fan section consists of
one or two forward curved centrifugal
fans powered by a premium efficiency
motor through an adjustable motor
sheave and fixed diameter blower pulley.
Controls
Refrigerant Handling and Safety
Consult the manufacturer’s material
safety data sheet (MSDS) for information
on refrigerant handling to fully
understand health, safety, storage,
handling, and disposal requirements. Use
the approved containment vessels and
refer to appropriate safety standards.
Comply with all applicable transportation
standards when shipping refrigerant
containers.
The standard control panel consists of a
high voltage terminal block, overload
relays for each fan motor, transformer, 3-
pole 24-volt contactors for eachmotor
and compressor, and a 5-second delay
timer. Remote thermostat controls are
field installed.
When cleaning system components or
parts, avoid using CFC-11 (R-11) or CFC-
113 (R-113). Use only cleaning-solvents
that do not have ozone depletion factors.
Properly dispose of used materials.
Refrigeration system cleanup methods
using filters and driers are preferred.
Check for leaks when excessive purge
operation is observed.
Field-Installed Accesories
These items ship separately for field
installation:
• steam coil
Service Equipment and Procedures
To minimize refrigerant emissions while
recovering refrigerant, use the
manufacturer’s recommended recycling
equipment per the MSDS. Use
equipment and methods which will pull
the lowest possible system vacuum while
recovering and condensing refrigerant.
Equipment capable of pulling a vacuum of
less than 1,000 microns of mercury is
recommended.
Keep abreast of unit enhancements,
conversion refrigerants, compatible
parts, and manufacturer’s recommenda-
tions that will reduce refrigerant emis-
sions and increase equipment operating
efficiencies.
• hot water coil
• plenum
• oversized motors
• remote thermostat
Note: Application of the above options
and/or accessories may require field
adjustment of fan speeds to ensure
proper airflow and performance.
Unit Nameplate
Do not open the unit to the atmosphere
for service work until refrigerant is fully
removed/recovered. When leak-testing
with trace refrigerant and nitrogen, use
HCFC-22 (R-22) rather than CFC-12 (R-
12) or any other fully-halogenated
The unit nameplate identifies the unit
model number, appropriate service
literature, and wiring diagrm numbers. It
is mounted on the control panel door.
Reference this information when making
inquires or ordering parts or literature.
refrigerant . Be aware of any new leak
test methods which may eliminate
PKG-SVX14A-EN
5
pre-installation
considerations
Installation
Receiving Checklist
Service Access
Pre-Installation Considerations
Complete the following checklist
immediately after receiving unit
shipment to detect possible shipping
damage.
Maintain adequate clearances around
and above the unit to ensure proper unit
operationa nd allow sufficient service
accesss. Trane recommends 36-inches
service access on all sides fo the unit.
Service access locations are shown in
figures on pages 8 through 9.
Pre-Installation Checklist
Complete the following checklist before
beginning unit installation.
† Verify the unit size and tagging with the
unit nameplate.
† Make certain the floor or foundation is
level, solid, and sufficient to support the
unit and accessory weights. Level or
repair the floor before positioning the
unit if neccesary.
† Allow minimum recommended
clearances for routine maintenance and
service. Refer to unit submittals for
dimensions.
† Allow three fan diameters above the
unit for the discharge ductwork. Return
air enters the rear of the unit and
conditioned supply air discharges
through the top.
† Electrical connection knockouts are on
the top, left side of the unit.
† Allow adequate space for piping
access and panel removal. Condenser
water piping, refrigerant piping, and
condensate drain connections are on
the lower left end panel.
† Inspect individual cartons before
accepting. Check for rattles, bent carton
corners, or other visible indications of
shipping damage.
† If a unit appears damaged, inspect it
immediately before accepting the
shipment. Make specific notations
concerning the damage on the freight
bill. Do not refuse delivery.
† Inspect the unit for concealed damage
before it is stored and as soon as
possible after delivery. Report
concealed damage to the freight line
within the allotted time after delivery.
Check with the carrier for their allotted
time to submit a claim.
† Do not move damaged material from
the receiving location. It is the receiver’s
responsibility to provide reasonable
evidence that concealed damage did
not occur after delivery.
† Do not continue unpacking the
shipment if it appears damaged. Retain
all internal packing, cartons, and crate.
Take photos of damaged material if
possible.
† Notify the carrier’s terminal of the
damage immediately by phone and
mail. Request an immediate joint
inspection of the damage by the carrier
and consignee.
† Notify your Trane representative of
the damage and arrange for repair.
Have the carrier inspect the damage
before making any repairs to the unit.
WARNING
Hazardous Voltage!
Disconnect all electric power, including
remote disconnects before servicing.
Follow proper lockout/tagout
procedures to ensure power cannot
be inadvertently energized. Failure to
disconnect power before servicing
could result in death or serious injury.
Installation Preparation
Before installing the unit, perform the
following procedures to ensure proper
unit operation.
1. Verify the floor or foundation is level.
Shim or repair as necessary. To ensure
proper unit operation, install the unit
level in both horizontal axes.
2. Allow adequate service and code
clearances as recommended in
“Service Access” section. Position the
unit and skid assembly in its final
location. Test lift the unit to determine
exact unit balance and stability before
hoisting it to the installation location.
See the “Proper Lifting Procedure”
section for proper rigging procedures
and cautions.
3. Remove the skids from under the unit.
If you find internal damage, file a claim
immediately to the delivering carrier.
4. Remove the protective shipping covers
from the unit.
5. Verify the compressor isolator shipping
brackets are removed and the isolators
are properly tightened for operation.
† Electrical supply power must meet
specific balance and voltage
requirements as described in the
“Electrical Requirements” section.
† Water-cooled units only: The installer
is responsible for providing a condenser
main, standby water pump, cooling
tower, pressure gauges, strainers, and
all components for waterside piping.
See the “Water Piping” section for
general waterside recommendations.
† Air-cooled units only: The installer is
responsible for providing and installing
the remote air-cooled condenser and
refrigerant piping, including filter driers.
Unit Storage
Take precautions to prevent condensate
from forming inside the electrical
compartments and motors if the unit is
stored before it is installed.
Receiving and Handling
Shipping Package
Midrange units ship assembled on skids.
Units ship assembled, piped, and charged
with either R410a (model SCWH)
or a dry nitrogen charge (model SCRH).
6
PKG-SVX14A-EN
pre-installation
considerations
Installation
Service Access
3 through 7.5-ton SCRH/SCWH
LATCH
THIS PANEL GOES TO TOP ON
HORIZONTAL AIR DISCHARGE
CONFIGURATION
HEATER
ACCESS
PROVIDED DISASSEMBLED
(FOR FIELD-INSTALLED REAR RETURN)
10 through 15-ton SCWH/SRCH with top-mounted fan configuration
FAN ACCESS
24"
24"
COIL / ELECTRIC HEATER
ACCESS
FRONT RETURN
MOTOR / DRIVE ACCESS
(RIGHT SIDE)
CONTROL BOX &
CONDENSER FAN ACCESS
TXV ACCESS
(RIGHT SIDE)
AIR FILTER ACCESS
(BOTH SIDES)
UNIT-MOUNTED T-STAT
OPENING (BOTH SIDES)
26" SERVICE CLEARANCE
RIGHT SIDE
26" SERVICE CLEARANCE
RIGHT SIDE
DRAIN CONNECTION
(BOTH SIDES)
POWER ENTRY
(BOTH SIDES)
CONTROL ENTRY
(BOTH SIDES)
18" SERVICE CLEARANCE
REAR
42" SERVICE CLEARANCE FRONT
REAR RETURN
26" SERVICE CLEARANCE
LEFT SIDE
26" SERVICE CLEARANCE
LEFT SIDE
COMPRESSOR ACCESS
SIGHT GLASS/FILTER DRIER ACCESS
(RIGHT SIDE)
PKG-SVX14A-EN
7
pre-installation
considerations
Installation
Service Access
10 through 15-ton SCRH/SCWH
10, 12, & 15-ton SCWH/SRCH
with side-mounted fan configura-
tion, field converted
8
PKG-SVX14A-EN
pre-installation
considerations
Installation
Isolator Placement
Table I-PC-1. Isolator load points, units with a vertical discharge configuration, lbs.
model
L1
L2
L3
L4
L1
L2
L3
L4
Note: Isolators are field-provided.
SCRB/SIRB
SCWB/SIWB
3-ton
5-ton
7.5-ton
10-ton
15-ton
99
105
120
157
227
273
359
127
166
221
253
356
105
129
177
263
315
133
165
234
334
388
118
166
230
293
382
124
165
231
300
375
115
154
208
243
122
203
266
332
Table I-PC-2. Isolator load points, units with a horizontal discharge configuration, lbs.
model
L1
L2
L3
L4
L1
L2
L3
L4
SCRB/SIRB
SCWB/SIWB
7.5-ton
10-ton
15-ton
250
318
404
108
150
166
313
363
510
135
169
210
285
383
514
126
211
215
319
383
514
140
211
215
Table I-PC-3. Isolator load points & types, units with a horizontal discharge, inverted “L”
configuration, lbs.
air-cooled models
water-cooled models
L1
L2
L3
L4
L1
L2
L3
L4
10-tonunit
spring
318
red
150
yellow
363
red
169
yellow
383
red
211
yellow
383
red
211
yellow
rubber-in-shear
green
red
green
red
green
red
green
red
15-tonunit
404
166
510
210
514
215
514
215
spring
purple yellow purple yellow
gray red gray red
purple yellow purple yellow
gray red gray red
rubber-in-shear
Note: Units ship with two different color isolators and should be placed as depicted in this chart to properly support the
unit weight. See Figures I-PC-1 & I-PC-2 for correct isolator positions by unit size.
3, 5, & 7.5-ton units
bottom view of unit
10 & 15-ton units
bottom view of unit
L3
L4
L1
L3
L4
L1
L2
L2
1 7/8
1 3/8
7
/8” dia. hole under all 4 corners
9/16” dia. hole under all 4 corners
1 7/8
3 3/4
Figure I-PC-1. Isolator mounting hole locations on 3, 5, &
7.5-ton units
Figure I-PC-2. Isolator mounting hole locations on 10 & 15-
ton units
PKG-SVX14A-EN
9
pre-installation
considerations
Installation
Proper Lifting Procedure
Follow these instructions and reference
Figure I-PC-3.
1. Slide a fork lift into the opening
provided on the unit base. Move the
fork lift carefully.
2. Using slings, attach through the circular
holes provided on the unit base. Protect
the unit from damage by rigging
equipment.
WARNING
Improper Unit Lift!
Test lift unit approximately 24 inches
high to verify the proper center-of-
gravity lift point. To avoid dropping the
unit, reposition the lifting point if the
unit is not level. Failure to properly lift
the unit could result in death, serious
injury, or possible equipment/
property-only damage.
Figure I-PC-3. Proper unit lifting procedure
10
PKG-SVX14A-EN
dimensions &
weights
Installation
3 & 5-tons
SCWH/SCRH
vertical discharge
horizontal discharge
(field converted)
SCRH
SCWH
SCWH/SCRH dimensions & weight, in-lbs.
unit
size
shipping
weight
operating
weight
A
B
C
D
E
F
G
J
K
L
M
N
O
P
Q
R
S
3
31.89 64.17 22.24 5.65 11.93 14.31 10.63 18.00 7.80
7.80 15.60 15.63 20.20 6.28
4.33
5.43
8.58
6.38
4.37
7.12
494
592
459
5
36.41 75.98 24.01 7.73 13.03 15.65 11.61 20.31 12.32 8.66 20.98 18.58 24.20 7.10
555
PKG-SVX14A-EN
11
dimensions &
weights
Installation
7.5-tons
SCWH/SCRH
vertical discharge
horizontal discharge
(field converted)
SCWH
SCRH
SCWH/SCRH weight, lbs.
unit
size
shipping
weight
operating
weight
7.5
702
657
12
PKG-SVX14A-EN
dimensions &
weights
Installation
10, 12, & 15-tons with top-mounted fan configuration
SCWH/SCRH
horizontal discharge
(field converted)
vertical discharge
SCWH
SCRH
SCWH/SCRH dimensions & weight, in-lbs.
unit
tons
shipping
weight
operating
weight
A
B
C
D
E
F
G
J
K
M
N
5
10 66.75 88.78 7.04 18.07 57.28 19.01 25.0
5.23
7.48
7.48
5.12
/
8.30
984
977
917
907
8
5
12 65.75 92.71 7.04 18.07 61.22 22.95 29.01 5.23
15 80.31 92.71 19.83 19.83 61.22 22.95 29.01 4.76
/
12.24
12.24
8
3
/
1098
1021
4
PKG-SVX14A-EN
13
dimensions &
weights
Installation
10, 12, & 15-tons with side-mounted fan configuration, field converted
SCWH/SCRH
Notes:
1. Base rail must be attached to the floor before converting
unit to side-mounted fan configuration.
2. Coil or electric heater cannot be assembed inside the
cabinet with the side-mounted fan configuration.
SCWH/SCRH Dimensions, in.
unit
tons
A
C
D
E
F
G
10 65.75 7.04 18.07 57.28 66.93 25.79
12 65.75 7.04 18.07 61.22 66.93 29.73
15 80.31 19.83 19.83 61.22 81.49 29.73
14
PKG-SVX14A-EN
dimensions &
weights
Installation
Plenum
Plenum dimensions & weight, in-lbs.
unit size
3-ton
A
B
weight
44
31.89
36.41
40.94
65.75
80.31
22.24
24.01
28.74
29.52
29.52
5-ton
54
7.5-ton
10 & 12-ton
15-ton
73
120
146
Hot water coil
3 & 5-ton units
A
3.15
B
5.91
1.57
D
G
F
0.28
E
0.39
0.39
C
1.03
1.03
1.08
1.0 NPT
0.75
0.75
5.9
SCWH/SCRH Hot water coil dimensions & weights, 3 & 5-ton units, in-lbs.
size
A
B
C
D
E
F
G
weight
13
3-ton
5-ton
26.46
30.98
18.98
23.50
25.67
30.20
5.79
7.040
5.79
7.040
10.00
12.50
12.76
15.26
18
PKG-SVX14A-EN
15
dimensions &
weights
Installation
Hot water coil
7.5-ton units
3.15
35.51
1.57
5.91
28.03
0.43
0.28
34.72
0.39
1.03
1.08
0.39
1.03
1.0 NPT
0.75
0.75
5.9
SCWH/SCRH Hot water coil dimensions & weights, in-lbs.
size
A
B
C
D
weight
24
7.5-ton
10-ton
12-ton
15-ton
-
-
-
-
58.72
58.72
73.29
50.98
50.98
63.98
6.95
6.95
8.52
59.51
59.51
74.07
49
49
55
Hot water coil
10 thru 15-ton units
1.03
1.08
1.03
A
0.39
0.39
0.28
0.43
C
B
1.57
3.19
D
BLOCKOFF (SHIPS DISASSEMBLED)
1.00 NPT
0.75
0.75
5.90
16
PKG-SVX14A-EN
mechanical
requirements
Installation
Duct Connections
Cooling Tower Piping
Water Piping
Cooling tower control affects the unit
cycle rates. Condenser water
temperature swings from 10-15°F may
cause excessive compressor, water
valve, and unit cycling. Be sure to set the
tower controls to minimize compressor/
unit cycling.
Install all air ducts according to the
National Fire Protection Association
standards for the “Installation of Air
Conditioning and Ventilation Systems
other than Residence Type (NFPA 90A)
and Residence Type Warm Air Heating
and Air Conditioning Systems (NFPA
90B).
Condenser Connections
Note: To prevent water damage, install
piping drain and vent plugs.
Condenser water piping knockouts are in
the lower left end panel. If necessary,
remove insulation to gain access. All field
installed piping must conform to
applicable local, state, and federal codes.
To complete condenser water
connections follow the procedure below.
1. Remove back panel to access the
water connection fittings.
2. Attach the water supply line to the inlet
connection, and the return line to the
outlet connection. The water connection
fittings are copper, so exercise extreme
care when connecting steel piping to
copper fittings.
3. Ensure that water piping is aligned to
the unit connection fittings. Failure to
align piping could cause stripped
threads, leakage, and possible unit
failure.
The cooling tower system requires a
separate drain in the water supply line for
service and repair.
Make duct connections to the unit with a
flexible material such as heavy canvas. If
a fire hazard exists, Trane recommends
using Flexweave 1000, type FW30 or
equivalent canvas. Use three inches for
the return duct and three inches for the
discharge duct. Keep the material loose
to absorb fan vibration.
Water Temperature Requirements
Install a water regulating valve in the
water supply line to maintain head
pressure when operating with water of
varying temperature. The valve
modulates condenser water flow to
control condensing pressure. The valve
opens or closes in response to
compressor discharge pressure as
sensed by its capillary line connection iin
the liquid line shrader valve. When the
valve is properly installed, water flow
automatically decreases as discharge
pressure falls and increases as discharge
pressure rises. Field installation of the
water regulating valve assembly
requires one valve for each refrigeration
circuit.
Run the ductwork straight from the
opening for a minimum of three fan
diameters. Do not make abrupt turns or
transitions near the unit due to increased
noise and excessive static losses. Use
elbows with splitters or turning vanes to
minimize static losses.
Poorly constructed turning vanes may
cause airflow generated noise. Check
total external static pressures against fan
characteristics to be sure the required
airflow is available throughout the
ductwork.
4. Connection to the unit water piping
requires a backing wrench to prevent
distortion of connecting tubing. Apply
backing wrench to water connection
points on unit.
Condensate Drain Connections
Install a water regulating valve in the
water supply line to maintainhead
pressure when operating with city water
of varying temperature.
WARNING
Hazardous Voltage!
Disconnect all electric power,
including remote disconnects before
servicing. Follow proper lockout/
tagout procedures to ensure power
cannot be inadvertently energized.
Failure to disconnect power before
servicing could result in death or
serious injury.
These units require a minimum water
pressure of 15 psig and will operate at a
maximum of 400 psig.
Provide safeguards against cold weather
drain line freeze.
PKG-SVX14A-EN
17
mechanical
requirements
Installation
Brazing Procedures
Refrigerant Piping (Air-Cooled
UnitsOnly)
Reference industry recommendations
for air-cooled unit refrigerant piping. If
suspendingpipingfromthebuilding, use
isolation hangers to prevent vibration
transmission.
7. Begin brazing when the joint is hot
enough to melt the brazing rod. The hot
copper tubing, not the flame, should
melt the rod.
8. Continue to apply heat around the joint
circumference until the brazing material
is drawn into the joint by capillary
action, making a mechanically sound
and gas-tight connection.
9. Visually inspect the connection after
brazing to locate any pin holes or
crevices in the joint. Use a mirror to
inspect connections that are difficult to
see.
Proper brazing techniques are essential
when installing refrigerant piping. Keep
the following factors in mind when
making sweat connections.
1. When heating copper in the presence
of air, copper oxide forms. To prevent
copper oxide from forming inside the
tubing during brazing, sweep an inert
gas, such as dry nitrogen, through the
tubing. Nitrogen displaces air in the
tubing and prevents oxidation of
interior surfaces. A nitrogen flow of one
to three cubic feet per minute is
sufficient to displace the air. Use a
pressure regulating valve or flow meter
to control the flow.
Air-cooled units ship with a holding
charge of nitrogen. Before installing unit
piping, momentarily depress either the
suction or discharge line access valve to
verify that the holding charge has not
been lost. If nitrogen does not escape
when depressing the access valve, leak-
test the entire refrigerant system to
determine the source of loss.
2. Ensure tubing surfaces that require
brazing are clean and the ends of the
tubes are carefully reamed to remove
any burrs.
3. Make sure the inner and outer tubes of
the joint are symmetrical and have a
close clearance, providing an easy slip
fit. If the joint is too loose, the tensile
strength of the connection will be
significantly reduced. Make the overlap
distance equal to the inner tube
diameter.
4. Wrap the body of each refrigerant line
component with a wet cloth to keep it
cool during brazing. Excessive heat can
damage the components.
5. If using flux, apply it sparingly to the
joint. Excess flux will contaminate the
refrigerant system.
Electrical Requirements
The charge is contained by a continuous
loopofbothhotgasandliquidlines. You
must cut the loop for connection to
discharge and liquid lines. See Figure I-
MR-1.
Follow these guidelines, referring to unit
wiring diagrams and supply power
dimensional information to ensure
correct electrical requirements at the
installation site. Reference supply power
wiring locations on unit submittals orin
the “Dimensions and Weights” section.
Specific unit wiring diagrams are
provided on each unit. Use these
diagrams for connections or trouble
analysis.
WARNING:
Hazard of Explosion and Deadly
Gases!
Never solder, braze or weld on
refrigerant lines or any unit com-
ponents that are above atmo-
spheric pressure or where
refrigerant may be present.
Always remove refrigerant by fol-
lowing the guidelines estab-
lished by the EPA Federal Clean
Air Act or other state or local
codes as appropriate. After refrig-
erant removal, use dry nitrogen to
bring system back to atmospheric
pressure before opening system
Unit Wiring Diagrams
Specific unit wiring diagrams are
provided on the inside of the control
panel door. Use these diagrams for
connections or trouble analysis.
6. Apply heat evenly over the length and
circumference of the joint, making sure
the entire joint becomes hot enough to
melt the brazing material.
for repairs. Mixtures of refriger-
ants and air under pressure may
become combustible in the pres-
ence of an ignition source leading
to an explosion. Excessive heat
from soldering, brazing or weld-
ing with refrigerant vapors
present can form highly toxic
gases and extremely corrosive
acids. Failure to follow all proper
safe refrigerant handling prac-
tices could result in death or seri-
ous injury.
Figure I-MR-1. Air-cooled unit refrigerant piping
18
PKG-SVX14A-EN
electrical
requirements
Installation
Electrical Data Calculations
RLA = rated load amps
Compressor LRA = locked rotor amps
Fan motor LRA = locked rotor amps,
N.E.C. Table 430 - 151
FLA = Full load amps, N.E.C.
Table 430 - 150
In this example, 2.2% imbalance is not
acceptable. Whenever a voltage
imbalance of more than 2.0% exists,
check the voltage at the unit disconnect
switch. If the imbalance at the unit
disconnect switch does not exceed 2.0%,
faulty unit wiring is causing the
Supply Power Wiring
It is the installer’s responsibility to provide
power supply wiring to the unit terminal
block or the non-fused disconnect switch
option. WiringshouldconformtoNECand
all applicable code requirements.
1. Verify the power supply available is
compatible with the unit nameplate
ratings. The supply power must be
within 10%of the rated voltage listed on
the unit nameplate.
imbalance. Conduct a thorough
Voltage utilization range is 10%
inspection of the unit electrical wiring
connections to locate the fault, and make
any repairs necessary.
Minimum circuit ampacity (MCA)
= 1.25 x largest motor amps (FLA or
RLA) + the sum of the remaining motor
amps.
2. Reference the electrical data in Table I-
ER-1. Protect the electrical service from
over current and short circuit
conditions in accordance with NEC
requirements. Size protection devices
according to the electrical data on the
unit nameplate.
WARNING
Live Electrical Components!
Maximum fuse size (MFS) and maximum
circuit breaker size (MCB) = 2.25 x largest
motor amps (FLA or RLA) + the sum of
the remaining motor amps.
During installation, testing, servicing,
and troubleshooting this equipment, it
may be necessary to work with live
electrical components. Have a
qualified licensed electrician or other
individual who is properly trained in
handling live electrical components
perform these tasks. Failure to follow
all electrical safety precautions when
exposed to live electrical components
could result in death or serious injury.
Note: If the rating value determined does
not equal a standard current rating of
over current protective device, use the
next lower standard rating for the
marked maximum rating.
3. If using a field-supplied disconnect,
install it at or near the unit in
accordance with NEC. Do not mounta
field-supplied disconnect on the unit.
Reference the electrical service
entrance location on unit submittals.
4. Complete the unit power wiring
connections onto either the main
terminal block or the field-provided non-
fushed disconnect switch.
Voltage Range
Voltages must be within +- 10% the
nameplate voltage. Ensure the unit
voltage is balanced by measuring at the
compressor terminals. Voltage imbalance
on three phase systems can cause motor
overheating and premature failure.
Maximum allowable imbalance is 2.0%.
WARNING
WARNING
Ground Wire!
Hazardous Voltage!
Voltage Imbalance
All field-installed wiring must be
completed by qualified personnel.
All field-installed wiring must
comply with NEC and applicable
local codes. Failure to follow this
instruction could result in death
or serious injuries.
Disconnect all electric power,
including remote disconnects before
servicing. Follow proper lockout/
tagout procedures to ensure power
cannot be inadvertently energized.
Failure to disconnect power before
servicing could result in death or
serious injury.
Read the voltage at the compressor
terminals to determine if it is balanced.
Voltage imbalance on three phase
systems can cause motor overheating
and premature failure. The maximum
allowable imbalance is 2.0%. Voltage
imbalance is defined as 100 times the
sum of the deviation of the three voltages
from the average (without regard to sign)
divided by the average voltage. For
example, if the three measured voltages
are 221, 230, and 227, the average
voltage would be:
WARNING
Grounding Required!
Follow proper local and state elec-
trical code on requirements for
grounding. Failure to follow code
could result in death or serious in-
jury.
CAUTION
Use Copper Conductors Only!
Unit terminals are not designed to
accept other type conductors. Failure
to use copper conductors may result
in equipment damage.
(221 + 230 + 227) = 226 volts
3
The percentage of voltage imbalance is
then:
100 * (226-221) = 2.2%
226
5. Provide proper unit grounding in
accordance with local and national
codes.
PKG-SVX14A-EN
19
electrical
requirements
Installation
Table I-ER-1. Model SCWH/SCRHelectrical data
evaporator standard motor
evaporator oversized motor
evap. fan motor
MFS /
MCB
compressor
RLA LRA
77.0
evap. fan motor
min. circuit
ampacity
min. circuit
ampacity
model
tons
3
voltage
MFS / MCB
qty.
1
hp
FLA
qty.
1
hp
FLA
qty
0.5
SC*H0303....
SC*H0304....
SC*H0305....
208-230V/60Hz/3Ph
460V/60Hz/3Ph
575V/60Hz/3Ph
12.9
5.7
2.21
1.00
0.80
18.3
8.1
30
15
15
3.15
1.42
1.14
19.3
8.5
30
15
15
1
1
35.0
31.0
4.8
6.8
7.1
SC*H0503....
SC*H0504....
SC*H0505....
208-230V/60Hz/3Ph
460V/60Hz/3Ph
575V/60Hz/3Ph
22.9 155.0
5.00
2.50
1.50
33.6
15.9
12.1
50
25
20
5.81
2.63
2.10
34.4
16.0
12.7
50
25
20
5
1
1
2
2
2
1
2
2
3
3
1
1
1
1
1
2
2
5
5
5
1
1
1
1
1
10.7
8.5
75.0
54.0
SC*H0753....
SC*H0754....
SC*H0755....
208-230V/60Hz/3Ph
460V/60Hz/3Ph
575V/60Hz/3Ph
27.9 164.0
13.6 100.0
6.30
3.10
2.40
41.2
20.1
15.2
60
30
25
5.81
2.63
2.10
40.7
19.6
14.9
60
30
25
7.5
10
12
15
10.2
78.0
SC*H1003....
SC*H1004....
SC*H1005....
208-230V/60Hz/3Ph
460V/60Hz/3Ph
575V/60Hz/3Ph
22.9 155.0
6.30
3.10
2.40
57.8
27.2
21.5
80
35
30
13.70
6.18
4.94
65.2
30.3
24.1
80
40
30
10.7
8.5
75.0
54.0
SC*H1203....
SC*H1204....
SC*H1205....
208-230V/60Hz/3Ph
460V/60Hz/3Ph
575V/60Hz/3Ph
25.4 147.7
9.40
4.60
3.40
66.5
31.2
24.4
90
40
30
13.70
6.18
4.94
70.8
32.7
25.9
90
45
35
11.8
9.3
75.0
59.6
SC*H1503....
SC*H1504....
SC*H1505....
208-230V/60Hz/3Ph
460V/60Hz/3Ph
575V/60Hz/3Ph
27.9 164.0
13.6 100.0
9.40
4.60
3.40
72.2
35.2
27.9
100
45
13.70
6.18
4.94
76.5
36.8
29.5
100
50
10.9
78.0
35
35
Notes:
1. Voltage range:
Nominal voltage 208 - 230V - acceptable range: 187 - 253V
Nominal voltage 460V - acceptable range: 414 - 506V
Nominal voltage 575V - acceptable range: 518 - 633V
2. Ampacity is calculated per UL formula, ampacity = (1.25 x compressor RLA + sum of the second compressor RLA (if
used) + evaporator motor FLA
3. Maximum fuse size is calculated per UL formula, MFS = (2.25 x compressor RLA) + sum of second compressor RLA (if
used) + evaporator motor FLA
WARNING
Hazardous Voltage!
Disconnect all electric power,
including remote disconnects before
servicing. Follow proper lockout/
tagout procedures to ensure power
cannot be inadvertently energized.
Failure to disconnect power before
servicing could result in death or
serious injury.
CAUTION
Use Copper Conductors Only!
Unit terminals are not designed to
accept other type conductors. Failure
to use copper conductors may result
in equipment damage.
20
PKG-SVX14A-EN
installation
procedure
Installation
Installation Checklist
Field Installed Control Wiring (Optional)
6. Reconnect the motor power wires per
the unit wiring diagram.
7. Bolt and/or clamp all brackets back into
place.
8. Replace control box cover and all
exterior panels.
†Complete the field wiring connections.
Reference the checklist below to verify all
steps required to successfully install a
deluxe self-contained unit are complete.
This checklist is intended to acquaint the
installing personnel with what is required
in the installation process. It does not
replace the detailed instructions detailed
in the applicable sections of this manual.
Note: All field installed wiring must
comply with NEC and applicable local
codes.
9. Verify the fan rotation and motor amp
draw.
Fan Discharge Conversion
Complete the steps below to convert the
fan discharge from vertical to horizontal.
Plenum Installation
1. Uncrate the plenum and accessory
bag.
WARNING
1. Remove all mid and top fan section
panels.
Hazardous voltage!
Disconnect all electric power, including
remote disconnects before servicing.
Follow proper lockout/tagout procedures
to ensure the power can not be
inadvertently energized. Failure to
disconnect power before servicing
could result in death or serious
injury.
2. Rotate the evaporator blower to the
vertical discharge configuration.
3. Apply the soft gasket provided around
the aluminum frame on top of the unit
as shown in Figure I-IP-1.
4. Using a screwdriver, tighten the self-
drilling screws as shown in Figure I-IP-
1. Be sure to tighten all screws on the
rear, right, and left sides through the
pilot holes on the plenum panels.
5. When installation is complete, adjust
the motor pulley and the discharge
grille for proper airflow.
2. Loosen the brackets inside the unit that
clamp the mid and fan sections
together.
3. Remove the control box cover and
disconnect the motor power wires.
Feed wires up through the unit and
secure out of the way until rotation is
complete.
4. Rotate the fan section to desired
position.
5. Re-route the motor power wires back
to the control box. Ensure all wiring is
free and not routed over any sharp
edges.
General Unit Requirements
†Install and secure the ductwork to the
unit.
†Check unit for shipping damage and
material shortage. Refer to the
Receiving Checklist.
Electrical Requirements
†Verify that the electrical power supply
characteristics comply with the unit
nameplate specifications.
†Inspect all control components; tighten
any loose connections.
†Connect properly sized and protected
power supply wiring to a field supplied/
installed disconnect and unit power
terminal block, or to the optional unit
mounted disconnect switch.
†Properly ground the unit.
Figure I-IP-1. Plenum installation
PKG-SVX14A-EN
21
pre-startup
requirements
Installation
Pre-Startup Checklist
Complete this checklist after installing the
unit to verify all recommended
installation procedures are complete
before unit startup. This does not replace
the detailed instructions in the
appropriate sections of this manual.
Always read the entire section carefully
to become familiar with the procedures.
Unit Location
‰Ensure the unit location is adequate for
unit dimensions, ductwork, piping, and
electrical connections.
‰Ensure access and maintenance
clearances around the unit are
adequate. See the “Service Access”
section.
Unit Mounting
‰Remove shipping brackets on the
compressor assembly and supply fan.
WARNING
Component Overview
‰Verify the fan and motor sheaves are
aligned.
‰Check the belt tension for proper
adjustment.
‰Ensure the fan rotates freely.
‰Tighten locking screws, bearing set
screws and sheaves.
‰Ensure bearing locking collars do not
wobble when rotated.
‰Ensure all air filters are properly
installed with consideration of size and
air flow.
‰Manually rotate the evaporator fan to
ensure free movement. Verify that all of
the fan mounting hardware is tight.
Hazardous Voltage!
Disconnect all electrical power,
including remote disconnects before
servicing. Follow proper lockout/tagout
procedures to ensure power cannot be
inadvertently energized. Failure to
disconnect power before servicing
could result in death or serious injury.
Receiving
‰Inspect unit and components for
shipping damage. File damage claims
immediately with the delivering carrier.
‰Check nameplate unit data so that it
matches the sales order requirements.
‰Check unit for missing material. Look
for ship-with accessories that are
packaged separately and placed inside
the access panel, fan section, or
compressor section. See the
Ductwork
‰Verify that all ductwork conforms to
NFPA 90A or 90B and all applicable
local codes.
“Receiving and Handling” section.
22
PKG-SVX14A-EN
Installation
startup
Unit Startup Procedures
1. Check all electrical connections for
tightness.
7. Allow unit to run until all system
temperatures and pressures stabilize.
2. Be sure all unit accessories are
properly set and installed.
3. Model SCWH: Verify condenser
water piping is properly connected,
supply, and return.
4. Model SCRH: Verify refrigerant
piping is properly connected, hot gas,
andliquid.
5. Inspect all ductwork and duct
connections.
6. Check for proper belt tension.
7. Check fan drive sheaves, pulleys, and
bearings.
WARNING
Hazardous Service Procedures!
The maintenance and trouble-
shooting procedures recom-
mended in this section of the
manual could result in exposure to
electrical, mechanical or other po-
tential safety hazards. Always refer
to the safety warnings provided
throughout this manual concerning
these procedures. When possible,
disconnect all electrical power in-
cluding remote disconnects before
servicing. Follow proper lockout/
tagout procedures to ensure the
power can not be inadvertently en-
ergized. When necessary to work
with live electrical components,
have a qualified licensed electri-
cian or other individual who has
been trained in handling live elec-
trical components perform these
tasks. Failure to follow all of the
recommended safety warnings
provided, could result in death or
serious injury.
Unit Startup Checklist
1. Turn the thermostat to the OFF
position.
2. Engage power supply by closing
power disconnect.
3. Switch thermostat to fan position and
adjust temperature setting below room
temperature. Evaporator fan should
start.
4. Check evaporator section for proper
operation.
5. Switch thermostat to cool position and
adjust temperature setting to below
room temperature. The evaporator fan
and compressor(s) should start.
Note: These units are equipped with high
efficiency scroll compressors. Check for
proper scroll rotation prior to operating
unit.
WARNING
Rotating Components!
During installation, testing, servicing
and troubleshooting of this product it
may be necessary to measure the
speed of rotating components. Have a
qualified or licensed service individual
who has been properly trained in
handling exposed rotating
components, perform these tasks.
Failure to follow all safety precautions
when exposed to rotating
WARNING
Hazardous voltage!
Disconnect all electric power, including
remote disconnects before servicing.
Follow proper lockout/tagout procedures
to ensure the power can not be
inadvertently energized. Failure to
disconnect power before servicing
could result in death or serious
injury.
components could result in death or
serious injury.
6. Check the evaporator fan for proper
rotation. If fan rotation is incorrect,
switch thermostat to Off position and
disconnect power. Reverse two phase
leads at disconnect and return back to
Step 1 of startup.
8. Check systems for proper operation
and performance. Observe unit in
operation and check for unusual noise,
vibration, belt, and fan clearances.
PKG-SVX14A-EN
23
sequence of
operation
Operation
Sequence of Operation
the condensing unit from running,
regardless of the thermostat tempera-
ture setting. The evaporator fan may
circulate air if the fan switch is in the On
position. With the switch in the Cool
position, the condensing unit and evapo-
rator will operate on a signal from the
thermostat calling for cooling.
The thermostat controls the unit
operation. It has both manual and
automatic switches so the thermostat
maintains desired comfort levels.
The fan switch allows manual selection of
the fan speed using the On or Auto
setting. With the switch set in the On
position, the evaporator fan runs
continously, independent from the
thermostat temperature setting. The
Auto position cycles the evaporator fan
on and off with the demand for heating or
cooling.
With the fan switch set to Auto and the
system switch set to Cool, the following
sequence takes place. On a rise in room
temperature,t he thermostat contacts
close to provide power to the evaporator
fan contactor,t he condensing unit fan
contactor,a nd the condensingunit
compressor contactors. As the room
temperature reaches setpoing, the
thermostat contacts open to de-energize
all contactors,a nd the system cycles off.
This system will remain off until additional
cooling is required and the cycle repeats.
The system switch may have two or
more positions. For example, using a
cooling only thermostat, the system
switch can be set in the Off or the Cool
position. The Off position disconnects
power from the thermostat contacts that
control the condensing unit. This prevents
24
PKG-SVX14A-EN
general
information
Maintenance
Table M-GI-1. Midrange maintenance general data
SCWH030 SCWH050
SCWH075 SCWH100 SCWH120
SCWH150
dimensions, in-lbs.
height
length
66.93
31.89
22.24
78.74
36.41
24.01
78.94
40.94
28.74
91.54
65.75
29.52
95.47
65.75
29.52
95.47
80.31
29.52
depth
weight (shipping / net)
cooling performance
net cooling capacity, btu/h
EER
nominal air flow, cfm
system power, kW
Copeland scroll compressor
quantity
494 / 459
592 / 555
702 / 657
1094 / 1027 1133 / 1063 1249 / 1172
36000
12.13
1200
3.0
65290
12.28
2000
5.3
87570
11.6
3000
7.6
116986
11.5
138204
11.1
167303
11.3
4000
10.2
4800
12.5
6000
14.8
1
1
1
2
2
2
model
ZP32
ZP57
ZP83
ZP57
ZP67
ZP83
indoor coil, 3/8" tube size
face area, sq. ft.
rows / fpf
3.19
4 / 144
4.98
4 / 144
7.13
3 / 168
12.12
2 / 168
12.12
2 / 168
14.56
3 / 168
water condenser, tube & tube
water connection, in.
indoor fan, belt-driven
quantity
3/4 NPT
3/4 NPT
3/4 NPT
1 1/4 NPT
1 1/4 NPT
1 1/4 NPT
1
1
2
2
2
2
diameter x width
motor
motor frame size
air filter, 1" throwaway
9 x 9
1 / 0.5
56
10 x 10
1 / 1.0
56
9 x 9
1 / 2.0
56
12 x 12
1 / 2.0
56
12 x 12
1 / 3.0
56
12 x 12
1 / 3.0
56
14 x 20 (1) +
20 x 20 (1)
18 x 24 (3) +
24 x 24 (1)
12 x 24 (1) + 24 x 24 (2)
size / (quantity), in.
14 x 25 (1)
18 x 24 (2)
refrigerant, R-410A, TXV control
refrigerant charge (Ckt 1 / 2), lbs.
hot water coil, 2-row, 108 fpf, 1/2" tubes
face area, sq. ft.
3.8
5.4
7.8
5.1 / 5.2
6.2
6.5/6.3
6.2
7.2/7.2
7.78
1.42
2.08
3.27
Notes:
1. Net cooling capacity is rated at 95°F ambient, 80°F entering dry bulb and 67°F entering wet bulb @ SCFM air condition.
2. EER is rated at ARI condition.
PKG-SVX14A-EN
25
maintenance
procedures
Maintenance
Maintenance Procedures
This section describes specific
maintenance procedures that must be
preformed as a part of the normal
maintenance program. Always
disconnect electrical power to the unit
before performing these procedures and
heed all warnings and cautions.
Note: the following coil cleaning proce-
dures apply only to the outdoor condens-
ers. Do not use these procedures for the
reheat or evaporator coils.
Coil Cleaning Procedure
1. Disconnect power to the unit.
2. Remove panels from the unit to gain
access to the coil.
3. Use a soft brush to remove loose dirt
and debris form both sides of the coil.
4. Straighten coil fins with fin comb as
required.
5. Mix the detergent with water
according to the manufacturers
instructions.
Cleaning the Condenser Coils
Clean the coil at least once each year or
more frequently if located in a dirty
environment, to help maintain proper unit
operating efficiency. High discharge
pressures are a good indication that the
coil needs cleaning. Follow the detergent
manufacturer instructions as closely as
possible to avoid potential coil damage.
WARNING
Live Electrical Components!
During installation, testing, servicing,
and troubleshooting this equipment, it
may be necessary to work with live
electrical components. Have a
qualified licensed electrician or other
individual who is properly trained in
handling live electrical components
perform these tasks. Failure to follow
all electrical components could result
in death or serious injury.
Observe all recommendations of the
cleanser manufacturer. The coil cleanser
manufacturer’s recommendations,
warnings and cautions will at all times
take precedence to these instructions.
1. Place solution in the sprayer. Be sure to
follow these guidelines if using a high-
pressure sprayer:
a) Keep minimum nozzle spray angle 15°.
b) Spray solution at a 90° angle to the coil
face.
c) Keep sprayer nozzle at least six inches
from the coil.
d) Sprayer pressure must not exceed
600 psi.
2. Spray leaving air side of the coil first
then spray the entering air side of the
coil. Allow the detergent and water
solution to stand on the coil for five
minutes.
3. Rinse both sides of the coil with cool,
clean water.
4. Inspect the coil. If it still appears dirty,
repeat the cleaning procedure.
5. Reinstall all unit components and
panels, and restore electrical power
and gas supply to the unit.
WARNING
Hazardous Chemicals!
Coil cleaning agents can be either acidic
or highly alkaline.Handle chemical
carefully. Proper handling should
include goggles or face shield, chemical
resistant gloves, boots, apron, or
protective suit as required. For personal
safety, refer to the cleaning agent
manufacturer’s materials safety data
sheet and follow all recommended safe
handling practices. Failure to follow all
safety instructions could result in death
or serious injury.
WARNING
Hazardous Voltage!
Disconnect all electrical power including
remote disconnects before servicing
unit. Follow proper lockout/tagout
procedures to ensure power cannot be
inadvertently energized. Failure to
disconnect power before servicing can
result in death or serious injury.
To clean the refrigerant coil, use a soft
brush and sprayer, such as a garden
pump up or high pressure type . In
addition, use a quality detergent; like
“SPREX AC’, “ OAKITE 161” or “OAKITE
166” and “COILOX.”
Periodic Maintenance Checklist
Inspect coil surface for cleanliness.
Clean as required, referring to the “Coil
Cleaning” section.
Note: If detergent is strongly alkaline (i.e.
has a pH value greater that 8.5 ) after
mixing, you must add an aluminum
corrosion inhibitor.
CAUTION
Freezing Temperatures!
Do not allow liquid refrigerant to come
into contact with the skin. If it does,
treat the injury similar to frostbite.
Slowly warm the ffected area with
lukewarm water and seek immediate
medical attention. Direct contact with
liquid refrigerant may cause minor or
moderate injury.
Annual Maintenance Checklist
Perform all monthly maintenance
inspections.
Perform seasonal startup checks.
Leak test refrigerant circuits. Inspect
contacts of fan motor contactors and
relays. Replace all worn contacts.
Clean and repaint any corroded
surface.
WARNING
Hazardous Voltage!
Disconnect all electrical power including
remote disconnects before servicing
unit. Follow proper lockout/tagout
procedures to ensure power cannot be
inadvertently energized. Failure to
disconnect power before servicing can
result in death or serious injury.
26
PKG-SVX14A-EN
maintenance
procedures
Maintenance
Refrigerant System
In the event of required system repair,
leak test the liquid line, evaporator coil,
and suction line at pressures dictated by
local codes, and using the following
guidelines.
1. Charge enough refrigerant and dry
nitrogen into the system to raise the
pressure to 100 psig.
2. Use a halogen leak detector, halide
torch, or soap bubbles to check for
leaks. Check interconnecting piping
joints, the evaporator coil connections,
and all accessory connections.
3. If a leak is detected, release the test
pressure, break the connections and
reassemble it as a new joint, using
proper brazing techniques.
4. If no leak is detected, use nitrogen to
increase the test pressure to 150 psig
and repeat the leak test. Also, use soap
bubbles to check for leaks when
nitrogen is added.
• To assist in reducing power generation
emissions, always attempt to improve
equipment performance with improved
maintenance and operations that will
help conserve energy resources.
Special Note on Refrigerant Emissions
Follow the Trane recommended
procedures on operation, maintenance,
and service to ensure refrigerant
conservation and emission reduction.
Also, pay specific attention to the
following:
• Whenever removing refrigerant from
equipment, recover for reuse, recycle,
reprocess (reclaim), or properly destroy
it.
• Always determine possible refrigerant
recycling or reclaiming requirements
before beginning recovery. Questions
about recovered refrigerants and
acceptable refrigerant quality
standards are addressed in ARI
Standard 700.
• Use approved containment vessels and
safety standards. Comply with all
applicable transportation standards
when shipping refrigerant containers.
• To minimize emissions while recovering
refrigerant, use recycling equipment.
Always attempt to use methods that
pull the lowest possible system vacuum
while recovering and condensing
refrigerant into containment.
• When leak checking with trace
refrigerant and nitrogen, use HCFC22
(R22) rather than CFC12 (R12) or any
other fully halogenated refrigerants. Be
aware of any new leak test methods
that eliminate refrigerant as a trace gas.
• When cleaning system components or
parts, do not use CFC11 (R11) or
CFC113 (R113). Refrigeration system
clean up methods using filters and
dryers are recommended. Do not use
solvents that have ozone depletion
factors. Properly dispose of used
materials.
WARNING
Confined Space Hazards!
Do not work in confined spaces where
sufficient quantities of refrigerant or
other hazardous, toxic, or flammable
gas may be leaking. Refrigerant or
other gases could displace available
oxygen to breathe, causing possible
asphyxiation or other serious health
risks. Some gases may be flammable
and or explosive. Evacuate the area
immediately and contact the proper
rescue or response authority. Failure
to take appropriate precautions or to
react properly to a potential hazard
could result in death or serious injury.
5. Retest the system to make sure new
connections are solid.
6. If a leak is suspected after the system
has been fully charged with refrigerant,
use a halogen leak detector, halide
torch, or soap bubbles to check for
leaks.
WARNING
Hazard of Explosion!
Use only dry nitrogen with a pressure
regulator to pressurize the unit. Do not
use acetylene, oxygen, compressed
air, or mixtures containing them.
Do not use mixtures of a hydrogen
containing refrigerant and air above
atmospheric pressure for pressure
testing as they may become
flammable and could result in an
explosion. Refrigerant, when used as
a trace gas should only be mixed with
dry nitrogen for pressurizing units.
Failure to follow these
Refrigerant Evacuation
For field evacuation, use a rotary style
vacuum pump capable of pulling a
vacuum of 100 microns or less.
When connecting the vacuum pump to a
refrigeration system, it is important to
manifold the pump to both the high and
low side of the system. Follow the pump
manufacturer’s directions.
WARNING
Use of Pressure Regulator –
Valves – Gauges!
Always use pressure regulators,
valves, and gauges to control drum
and line pressures when pressure
testing equipment. Failure to follow
these instructions could result in an
explosion causing death, serious
injury, or equipment damage.
recommendations could result in
death, serious injury, equipment, or
property-only damage.
• Take extra care to properly maintain all
service equipment directly supporting
refrigerant service work such as
gauges, hoses, vacuum pumps, and
recycling equipment.
• Stay aware of unit enhancements,
conversion refrigerants, compatible
parts, and manufacturer’s
recommendations that reduce
refrigerant emissions and increase
equipment operating efficiencies.
Follow specific manufacturer’s
guidelines for conversion of existing
systems.
WARNING
Leak Testing!
Do not exceed 200 psig when leak
testing system. Failure to follow these
instructions could result in an
explosion causing death or serious
injury.
PKG-SVX14A-EN
27
maintenance
procedures
Maintenance
Charging the Refrigerant System
To completely charge the system, charge
gaseous refrigerant into the suction line
shrader valve with the unit running.
However, make sure that some
refrigerant is present in each circuit
before starting the compressors.
CAUTION
Motor Winding Damage!
Do not use a megohm meter or apply
greater than 50 VDC to a compressor
motor winding while it is under a
deep vacuum. Voltage sparkover may
cause damage to the motor windings.
CAUTION
Compressor Damage!
Do not allow liquid refrigerant to enter
the suction line. Excessive liquid
accumulation in the liquid lines may
result in compressor damage.
WARNING
Hazardous Pressures!
If a heat source is required to raise
the tank pressure during removal of
refrigerant from cylinders, use only
warm water or heat blankets to raise
the tank temperature. Do not exceed
a temperature of 150°F. Do not, under
any circumstances, apply direct flame
to any portion of the cylinder. Failure
to follow these safety precautions
could result in a violent explosion,
which could result in death or serious
injury.
CAUTION
Compressor Damage!
Never manually or automatically
pump down below 7 psig. This may
cause the compressor to operate in a
vacuum and result in compresor
damage.
Table M-MP-1. Normal operation condition
water-cooled
air-cooled
high pressure
low pressure
superheat
280 to 430 psig
320 to 570 psig
100 to 160 psig
4 to 9°F
5 to 10°F
subcooling
Table M-MP-2. Controls adjustment
control
disarming
rearming
high pressure control (air-cooled & 12-ton water cooled)
624 17.5 psig
464 29 psig
unit (ton / voltage)
high pressure control (water-cooled except 12-ton)
low pressure contol
450 10 psig
51 7 psig
266 5F
348 14.5 psig
94 7 psig
194 5
198
3 / 204-230 & 575
5 / 208-230
275 5F
266 5F
198
5 / 575
motor windings thermostat, standard motor only
194 5F
248 5F
194 5F
221 5F
135
156
135
142
7.5 - 10 / 208-230
7.5 - 10 / 575
12 - 15 / 208-230
12 - 15 / 575
28
PKG-SVX14A-EN
periodic
checklists
Maintenance
Periodic Checklists
interference with fan blades. Remove
obstructions and debris. Center the fan
wheel if necessary.
4. Check the fan assembly sheave
alignment. Tighten set screws to their
proper torques.
5. Inspect the thermal expansion valve
sensing bulbs for cleanliness, good
contact with the suction line, and
Monthly Checklist
The following checklist provides the
recommended maintenance schedule to
keep the unit running efficiently.
adequate insulation from ambient air.
WARNING
WARNING
Live Electrical Components!
During installation, testing, servicing,
and troubleshooting this equipment, it
may be necessary to work with live
electrical components. Have a
qualified licensed electrician or other
individual who is properly trained in
handling live electrical components
perform these tasks. Failure to follow
all electrical components could result
in death or serious injury.
Note: Perform this procedure monthly if
the unit is in a coastal or corrosive
environment.
Hazardous Voltage!
Disconnect all electrical power including
remote disconnects before servicing
unit. Follow proper lockout/tagout
procedures to ensure power cannot be
inadvertently energized. Failure to
Annual Maintenance
Check and tighten all set screws, bolts,
disconnect power before servicing could locking collars and sheaves.
result in death or serious injury.
1. Inspect, clean, and tighten all electrical
connections.
2. Visually inspect the entire unit casing
for chips or corrosion. Remove rust or
corrosion and repaint surfaces.
3. Visually check for leaks in refrigerant
piping.
4. Inspect fan, motor, and control
contacts. Replace badly worn or eroded
contacts.
1. Inspect unit air filters. Clean or replace
if airflow is blocked or if filters are dirty.
2. Inspect coils for icing. Icing on the coils
may indicate low airflow supply,
restricted airflow from dirty fins.
3. Check the fan belt condition and
tension. Adjust tension if belt is floppy or
squeals continually.
4. Check and record operating pressures.
Semi-Annual Maintenance
1. Verify the fan motor is properly aligned
and bolted tight to the motor frame.
2. Lubricate fan bearings.
3. With power disconnected, manually
rotate the fan wheel to check for
obstructions in the housing or
WARNING
Rotating Components!
During installation, testing, servicing
and troubleshooting of this product it
may be necessary to measure the
speed of rotating components. Have a
qualified or licensed service individual
who has been properly trained in
handling exposed rotating
components, perform these tasks.
Failure to follow all safety precautions
when exposed to rotating
components could result in death or
serious injury.
PKG-SVX14A-EN
29
Maintenance
troubleshooting
WARNING
Hazardous voltage!
Disconnect all electric power, including
remote disconnects before servicing.
Follow proper lockout/tagout procedures
to ensure the power can not be
inadvertently energized. Failure to
disconnect power before servicing
injury.
could result in death or serious
Troubleshooting
Use the following steps and procedures to help correct these common problems.
Problem
Remedy
The entire unit does not operate.
Possible cause
1. Power interruption
1. Check for blown fuses or tripped circuit breakers. Replace or reset if necessary.
2. Setting may be too high; check unit and reset. Thermostat may be out of calibration
or otherwise defective; replace.
2. Thermostat not operating
3. Electrical panel: a) 24-volt transformer
defective; b) loose wire
3. Correct as required.
Problem
Remedy
Fan runs but compressor does not start.
Possible cause
1. Low voltage
1. Check power supply for voltage outside the acceptable voltage range.
2. Check the control unit for loose wires. Firm any loose connections.
3. Replace.
2. Remote thermostat
4. Check for loose wire connection, broken or burned contacts. If defective, replace.
5. Locate leak and repair. Recharge unit.
6. Tug on wires to see if they will separate from connections. Replace terminals if
necessary.
7. Check for shorts, opens, and grounded. Remove and replace compressor.
8. Remove and replace.
3. Compressor contactor open or burned
4 .High pressure control cutting out unit
5. Refrigerant leak - no gas
6. Loose or defective wires.
7. Compressor shorted, open or burned
8. Defective compressor
Problem
Remedy
Unit held off by safety.
Possible cause
1. Unit cutout on high pressure control, set at
385 psig
2. Refrigerant leak
3. Air restriction, dirty coils
4. Partial restriction in refrigerant system
5. High pressure control
6. TXV power element charge loss
7. Loose connection in electrical unit
1. Adjust tubes by bending slightly to firm position without touching other unit parts.
2. Level unit base. Fully support base.
3. Check and tighten loose screws.
4. Tighten screws on fan wheel shaft.
5. Adjust wheel position on motor shaft
6. Replace fan motor.
7. Replace fan bearing.
Problem
Remedy
Noisy operation.
Possible cause
1. Copper tubing vibrating
2. Machine vibrating out of level
2. See if unit is low on refrigerant charge. Repair leak and recharge unit.
3. Verify if the air filter is dirty or has an airflow restriction, and correct problem.
4. Locate restriction by inspecting refrigerant lines for temperature changes. Remove
restriction, evacuate, and recharge.
5. Replace, if defective.
6. Evacuate, replace element, recharge.
7. Trace and firm up connection.
30
PKG-SVX14A-EN
Maintenance
troubleshooting
WARNING
Problem
Insufficientcooling
Possible cause
Hazardous voltage!
Disconnect all electric power, including
remote disconnects before servicing.
Follow proper lockout/tagout procedures
to ensure the power can not be
inadvertently energized. Failure to
disconnect power before servicing
could result in death or serious
injury.
1. Insufficient air flow due to: a) dirty
evaporator; b) ice on evaporator coils
(indicates airflow restriction through
evaporator); c) dirty filter; d)
obstructed discharge air intake; e)
fan motor not running; f) evaporator
fan or fan wheel slipping on motor
shaft
2. Heat gain or loss in room exceeds
unit capacity
3. Defective compressor
4. Insufficient refrigerant charge
indicated
by: a) low wattage; b) condenser air
outletcold
5. Overcharge of refrigerant indicated
by high wattage and sweating of the
compressor return line
6. Thermostat not set for full cooling
7. Insufficient airflow through
condenser
due to: a) dirty condenser; b) loose belt;
c) fan loose on shaft
8. Cutout on high pressure
9. Only one refrigerant circuit
operational
Remedy
1. Correct as follows: a) clean; b) defrost (using fan operation only); c) clean or
replace filter; d) remove obstruction; e) check electrical system; f) adjust fan
position. Tighten set screw on fan wheel.
2. Refer to original load calculations. Recalculate heat gain or loss.
3. Replace, if necessary.
4. Check refrigerant charge pressure with gauges. If refrigerant is low, recharge
system.
5. Reclaim excess refrigerant.
6. Refer to thermostat operating instructions.
7. Correct as follows: a) clean coil; b) verify drive is adjusted correctly; c) tighten fan
on shaft.
8. See that air is flowing and that damper is set properly.
9. Reset high pressure cutout on inoperative circuit. Check contactor in inoperative
circuit.
in 2-circuit units
Problem
Remedy
Unit short cycles
1. Repair or replace.
Possible cause
2. Trace and repair.
1. Remote thermostat
2. Loose connection in electrical unit
3. Thermostat contacts fluttering
4. Air flow to evaporator is restricted
5. Insufficient charge
3. Repair or replace.
4. Flush or blow dirt out of coil.
5. Reclaim, evacuate, recharge per nameplate.
Problem
Remedy
Compressor starts and runs, but fan
does
1. Replace.
2. Replace.
not run.
Possible cause
3. Adjust fan mounting.
1. Faulty switch
2. Open fan motor coil circuit
3. Fan binding on shroud or venturi ring
PKG-SVX14A-EN
31
typical wiring
diagram
Maintenance
32
PKG-SVX14A-EN
typical wiring
diagram
Maintenance
PKG-SVX01A-EN
33
typical wiring
diagram
Maintenance
34
PKG-SVX14A-EN
typical wiring
diagram
Maintenance
PKG-SVX01A-EN
35
Literature Order Number
Date
PKG-SVX14A-EN
October 2008
Supersedes
PKG-SVX14A-EN September2007
Trane has a policy of continuous productand product dataimprovement and reserves the right to changedesign
and specifications without notice.
For more information, contact your local Trane
office or e-mail us at [email protected]
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