Installation, Operation,
and Maintenance
Integral Air-Cooled
Self-Contained Unit
Model SCIH
“AO” and later design sequence
September 2007
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contents
Cross reference to related publications:
• Integral Air-Cooled Self-Contained Product Catalog, PKG-PRC009-EN
Installation ……………………………………………………………2
general information ……………………………………………2
pre-installation considerations ………………………………7
dimensions and weights ……………………………………8
mechanical requirements ……………………………………12
electrical requirements ………………………………………13
installation procedure ………………………………………15
pre-startup requirements ……………………………………19
startup …………………………………………………………20
Operation ……………………………………………………………21
sequence of operation ………………………………………21
Maintenance…………………………………………………………22
general information …………………………………………22
maintenance procedures ……………………………………23
periodic checklists ……………………………………………26
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general
information
Installation
IntegralAir-Cooled Model Number Description
Following is a complete description of the integral air-cooled unit model number. Each digit in the model number has a corresponding
code that identifies specific unit options.
S C I
H
4
0 7 5 3 1 A 0
5 6 7 10 11
1
0
1
0
0
1
2
3
8
9
12 13 14 15 16
Digit 1 - Unit Model
Digit 8 - UnitVoltage
Digit 13 - Control
S = self contained
3 = 208 - 230 volt/60 hz/3 ph
4 = 460 volt/60 hz/3 ph
5 = 575 volt/60 hz/3 ph
0 = control interface
Digit 2 - UnitType
C = commercial
Digit 14 - Unit Finish
1 = painted
2 = coated finish only
Digit 9 -Air Flow Configuration
Digit 3 - Condenser Medium
= integral air-cooled
1 = horizontal discharge / rear return
2 = vertical discharge / front return
3 = vertical discharge / rear return
I
Digit 15 - Coil Finish
0 = none
C = condenser coated
E = evaporator coated
H = condenser + evaporator coated
Digit 4 - Development Sequence
H = development series
Digit 10, 11 - Design Sequence
A0 = design sequence
Digit 5, 6, 7- Unit Nominal Capacity
050 = 5 tons
Digit 12 - Air FilterType
1 = one-inch fiberglass throwaway
Digit 16 - Agency Listing
A = C ETL listing
075 = 7.5 tons
100 = 10 tons
150 = 15 tons
4
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general
information
Installation
Accessory Model Number Description
Following is a complete description of the integral air-cooled accessory model number. Each digit in the model number has a
corresponding code that identifies specific unit options.
P
1
V I
H
4
A
5
A
6
1
7
1
8
1
9
A0
A
0
1
1
2
3
10 11 12 13 14
Digit 8 - Discharge Plenum
Digit 1 - Parts/Accessories
F = 7.5-ton, 460V evaporator, OS motor
G = 10-ton, 460V evaporator, OS motor
H = 15-ton, 460V evaporator, OS motor
J = 5-ton, 575V evaporator, OS motor
K = 7.5-ton, 575V evaporator, OS motor
L = 10-ton, 575V evaporator, OS motor
M = 15-ton, 575V evaporator, OS motor
0 = none
P = parts/accessories
1 = 5-ton plenum
2 = 7.5-ton plenum
3 = 10-ton plenum
4 = 15-ton plenum
Digit 2 - Unit Model
V = vertical self contained
Digit 3 - Condenser Medium
I
= integral air-cooled
Digit 9 - Low Ambient Damper
0 = none
1 = 5/7.5-ton low ambient damper
2 = 10/15-ton low ambient damper
Digit 4 - Development Sequence
H = development sequence
Digit 13 - Filter
0 = none
1 = 5-ton 1” fiberglassTA, 6PC
2 = 5-ton 2” fiberglassTA, 6PC
3 = 5-ton 2” mesh filter washable, 6PC
4 = 7.5-ton 1” fiberglassTA, 6PC
5 = 7.5-ton 2” fiberglassTA, 6PC
6 = 7.5-ton 2” mesh filter washable,
6PC
7 = 10/15-ton 1” fiberglassTA, 6PC
8 = 10/15-ton 2” fiberglassTA, 6PC
9 = 10/15-ton 2” mesh filter washable,
6PC
Digit 5 - Thermostat
0 = none
Digit 10 - Design Sequence
** = factory assigned
A = 10/15 ton t-stat 2C w/auto base
D = 10/15 ton prg. t-stat 2H2C w/2H2C
base
E = 10/14 ton t-stat 2H2C w/auto base
F = 10/15 ton t-stat 2H2C w/auto/mnl
base
Digit 11 - Oversize Motor Condenser
0 = none
A = 5-ton, 208V condenser, OS motor kit
B = 7.5-ton, 208V condenser, OS motor
C = 10-ton, 208V condenser, OS motor
D = 15-ton, 208V condenser, OS motor
E = 5-ton, 460V condenser, OS motor
F = 7.5-ton, 460V condenser, OS motor
G = 10-ton, 460V condenser, OS motor
H = 15-ton, 460V condenser, OS motor
J = 5-ton, 575V condenser, OS motor
K = 7.5-ton, 575V condenser, OS motor
L = 10-ton, 575V condenser, OS motor
M = 15-ton, 575V condenser, OS motor
G = 10/15 ton t-stat 2H2C w/mnl base
H = 5/7.5 tonprg t-stat 2H2C w/mnl base
J = 5/7.5 ton t-stat 1H1C base
K = 5/7.5 ton t-stat 1H1C w/auto/mnl
base
Digit 14 - Filter Rack Kit
0 = none
A = 5-ton filter rack kit
B = 7.5-ton filter rack kit
C = 10-ton filter rack kit
D = 15-ton filter rack kit
L = 5/7.5 ton t-stat 1H1C w/mnl base
Digit 6 - Remote Wall Sensor
0 = none
A = remote wall sensor
Digit 7 - Heat Coil
Digit 12 - Oversize Motor Evaporator
0 = none
A = 5-ton, 208V evaporator, OS motor
B = 7.5-ton, 208V evaporator, OS motor
C = 10-ton, 208V evaporator, OS motor
D = 15-ton, 208V evaporator, OS motor
E = 5-ton, 460V evaporator, OS motor
0 = none
1 = 5-ton hot water coil
2 = 7.5-ton hot water coil
3 = 10/15-ton hot water coil
4 = 5-ton steam coil
5 = 7.5-ton steam coil
6 = 10/15-ton steam coil
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general
information
Installation
General Information
Control box access is from the front of
the unit to ease electrical hook-up.
The integral air-cooled unit, model SCIH,
is a high efficiency, vertical air cooled air
conditioner. 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, and
Controls
The standard control panel consists of a
high voltage terminal block, overload
relays for each fan motor, transformer, 3-
pole 24 volt contactors for each motor
and compressor, and a 5-second delay
timer. Remote thermostat controls are
field-installed.
460/3/60, 575/3/60.
Refrigeration Circuits
Units are configured in single or double
refrigeration circuits. Each circuit consists
of a:
Field Installed Accessories
These items ship separately for field
installation:
• high efficiency scroll compressor
mounted on rubber isolation grommets
• condenser and evaporator coils,
designed for optimum performance and
efficiency with lanced fins and rifled
tubing,
• steam coil
• hot water coil
• plenum
• low ambient damper
• oversized motors
• remote thermostat
• and filter-drier.
Evaporator Section
Note: Application of the above options
and/or accessories may require field
adjustment of fan speeds to ensure
proper airflow and performance.
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.The condenser 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.
Condenser motor belt tension is adjusted
by an adjustable motor mounting base.
Unit Nameplate
The unit nameplate identifies the unit
model number, appropriate service
literature, and wiring diagram numbers. It
is mounted on the control panel door.
Reference this information when making
inquires or ordering parts or literature.
6
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pre-installation
considerations
Installation
Pre-Installation Considerations
Acoustic Considerations
Before determining the final unit
immediately before accepting the
shipment. Remove access panels and
check for interior component damage.
Make specific notations concerning the
damage on the freight bill. Do not
refuse delivery.
† Report concealed damage to the
freight line within the allotted time after
delivery. Verify with the carrier their
allotted time to submit a claim.
Checklist
installation site, remember that proper
unit placement is critical in reducing
transmitting sound levels to the building.
The ideal time to make provisions to
reduce sound transmissions is during
the design phase.The most economical
means of avoiding a potential acoustical
problem is to place units in areas that are
not acoustically sensitive.
The following checklist gives an overview
of the recommended pre-installation
considerations. Follow the procedures in
this section to ensure installation is
complete and adequate for proper unit
operation.Verify this checklist is complete
before beginning unit installation.
† Verify the unit size and tagging with the
unit nameplate to ensure the correct
unit is received.
Note: Failure to follow these procedures
may result in no reimbursement for
damages from the freight company.
Unit Location
† Inspect the unit for possible shipping
damage and make any necessary
claims with the freight delivery
company immediately.
Install the unit in a dry, indoor area
between 50 and 115°F. Choose a location
where sound levels, airflow and vibration,
commonly associated with heavy-duty
commercial equipment, will not be
objectionable to occupants. In multiple
unit installations, separate the individual
units and stagger their location from floor
to floor so as not to starve units for air
and not to discharge warm condenser air
from one condenser into the intake of
another condenser. Place thermostats, air
supplies and returns so that the individual
unit will operate within its zone.
† 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 packaging.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 yourTrane representative of
the damage and arrange for repair.
Have the carrier inspect the damage
before making any repairs to the unit.
† Before installing the unit, remember to
allow minimum recommended
clearances for routine maintenance and
service. Refer to unit dimensions and
clearances on submittals or in the
Dimensions and Weights section.
† Verify the unit is configured properly
prior to beginning unit installation.
† Make proper acoustic considerations
before installing unit. Do not install unit
near sound-senstive locations.
† Allow adequate space for service and
operating clearances. Reference
“Service Access” section on this page.
† Make provisions for correct supply
power and note electrical connection
knockouts locations on the unit
Installation Preparation
Before installing the unit, perform the
following procedures to ensure proper
unit operation.
1.Verify the installation location is level.
To ensure proper unit operation, install
the unit level (zero tolerance) in both
horizontal axes. Failure to level the unit
properly can result in condensate
management problems, such as
standing water inside the unit. Standing
water and wet surfaces inside units can
result in microbial growth (mold) in the
drain pan that may cause unpleasant
odors and serious health-related indoor
air quality problem.
Unit Storage
submittals or in the Dimensions and
Weights section.
† Ensure the unit installation location is
level.
Take precautions to prevent condensate
from forming inside the unit’s electrical
compartments and motors if the unit is
stored before it is installed.
Service Access
Receiving and Handling
Maintain adequate clearances around
and above the unit to ensure proper unit
operation and allow sufficient service
access.Trane recommends 36-inches
service access on all sides of the unit.
Shipping Package
Integral air-cooled units ship assembled
on skids. Units ship in the unitary
configuration, assembled, piped, and
charged with refrigerant.
2. Allow adequate service and code
clearances as recommended in the
Service Access section.
Receiving Checklist
WARNING
Complete the following checklist
immediately after receiving unit
shipment to detect possible shipping
damage.
Hazardous voltage!
3. Position the unit in its final location.
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.
Unit Placement
Install the unit on a firm, level surface.
† Verify that the unit nameplate data
corresponds to the sales order and bill
of lading (including electrical data).
† Visually inspect the unit exterior for
physical signs of shipping damage or
material shortages.
Installing Optional Accessories
Before installing ductwork, install
accessories on unit.
† If a unit appears damaged, inspect it
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dimensions
and weights
Installation
Model SCIH
5 & 7.5-ton units
31.50
13.64
A
15.43
SUPPLY
AIR
B
C
18.86
D
E
2.74
SUPPLY
AIR
RETURN
AIR
SIDE
ACCESS
CONDENSER
DISCHARGE
SIDE
ACCESS
CONDENSER
RETURN
CONDENSER COIL
FORKLIFT ACCESS
2.76
2.76
back view
side view
front view
SCIH Unit Dimensions &Weights, in-lbs.
Ship.
Wgt.
Oper.
Wgt.
Unit Size
A
B
C
D
E
5 ton
42.72 9.29 17.99 8.15 15.70
56.69 20.63 20.63 18.92 18.92
864
960
1333
1480
798
881
1241
1388
Model SCIH
10 & 15-ton units
7.5 ton
10 ton
15 ton
—
—
—
—
—
—
—
—
—
—
31.50
13.64
85.83
10.03
SUPPLY
AIR
22.70
15.20
16.67
18.86
14.77
18.86
15.20
2.74
SUPPLY
AIR
RETURN
AIR
SIDE
ACCESS
GRILL
CONDENSER
DISCHARGE
CONTROLS
ACCESS
COMPRESSOR
ACCESS
SIDE
ACCESS
CONDENSER
RETURN
CONDENSER COIL
FORKLIFT ACCESS
2.68
side view
back view
front view
8
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dimensions
and weights
Installation
supply airflow
SCIH Component
Overview
water coil
vent
outlet
supply airflow
airflow
inlet
filter frame
airflow
low ambient
damper
airflow
back of unit
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dimensions
and weights
Installation
SCIHAccessories
Plenum
B
A
C
SCIH Plenum Dimensions &Weight, in-lbs.
Unit Size
A
B
C
Grill Size (W x H) Weight
3
1
1
5 ton
7.5 ton
10 & 15 ton
42 /4 16 /4 31 /2
38 3/4 x 12 3/4
52 3/4 x 12 3/4
81 7/8 x 12 3/4
76
95
141
3
1
1
56 /4 16 /4 31 /2
7
1
1
85 /8 16 /4 31 /2
Low Ambient Damper
C
A
Note: Low ambient damper is field-installed.
B
SCIH LowAmbient Damper Dimensions &Weight, in-lbs.
Unit
Size
A
B
C
Weight
5 & 7.5 ton
10 & 15 ton
19 1/8
7 7/8
11
11
20
40
52 3/4
7 7/8
10
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dimensions
and weights
Installation
Hot Water Coil
3.239
OD
CONNECTION
OD
CONNECTION
B
A
SCIH HotWater Coil Dimensions &Weight, in-lbs.
Unit
Size
Wet Coil
Weight
Dry Coil
Weight
A
B
Notes:
5Ton
7.5 Ton
10 & 15Ton
38 1/2 33 1/16
52 1/2 47 1/16
81 5/8 76 1/4
49
63
96
39
50
75
1. Coils are field-installed.
2. Coil connections are mirror-image and can be mounted
with either left or right-hand connections.
Steam Coil
SCIH Steam Coil Dimensions &Weights, in-lbs.
Unit
Size
return supply
A
B
C
D
Weight
Notes:
1. Coils are field-installed.
2. Coil connections are mirror-image and can be mounted
with either left or right-hand connections.
5Ton
7.5 Ton
10 & 15Ton
38 1/2
52 1/2
81 5/8
31 7/8
45 7/8
74
1 1/2
1 1/2
2
2
2
3
55
68
93
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mechanical
requirements
Installation
Ductwork Considerations
Direct louvers up and down for condens-
ers air discharge and intake so as to not
short circuit condenser air. Pitch outdoor
ducts away from unit to protect unit from
rain and snow entering with condenser
air. Auxiliary louvers and hoods may be
required for this purpose. Attach ducts to
unit with canvas section duct connectors
or other suitable noise and vibration
absorbing devices.
Install all air ducts according to the
National Fire Protection Association
standards for the “Installation of Air
Conditioning andVentilation Systems
other than ResidenceType (NFPA 90A)
and ResidenceType Warm Air Heating
and Air Conditioning Systems (NFPA
90B).
Make duct connections with a flexible
material such as heavy canvas. If a fire
hazard exists,Trane recommends using
Flexweave 1000, type FW30 or equiva-
lent canvas. Use three inches for the
return duct and three inches for the
discharge duct. Keep the material loose
to absorb unit vibration.
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.
Run the ductwork as far as possible
without changing size or direction. 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.
12
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electrical
requirements
Installation
MFS = 2.25 x largest motor amps (FLA or
RLA) + the sum of the remaining motor
amps.
Supply PowerWiring
It is the installer’s responsibility to
provide power supply wiring to the unit.
Wiring should conform to NEC and all
applicable code requirements.To ensure
the unit supply power wiring is properly
sized and installed, follow the guidelines
below:
WARNING
Ground Wire!
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.
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 injury.
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.
2. Reference the electrical data inTable I-
ED-1. Protect the electrical service from
over current and short circuit
conditions in accordance with NEC
requirements. Size protection devices
according to the electrical date on the
unit nameplate.
3. If using a field-supplied disconnect,
install it at or near the unit in
accordance with NEC. Do not mount a
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-fused disconnect switch.
5. Provide proper unit grounding in
accordance with local and national
codes.
Electrical Data Calculations
WARNING
Live electrical components!
During installation, testing, servicing
and troubleshooting of this product, it
may be necessary to work with live
electrical components. Have a
qualified licensed electrician or other
individual who has been 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.
WARNING
Grounding Required!
Follow proper local and state electrical
code on requirements for grounding.
Failure to follow code could result in
death or serious injury.
Electrical Requirements
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 or in
the “Dimensions andWeights” section.
Specific unit wiring diagrams are
provided on each unit. Use these
diagrams for connections or trouble
analysis.
Voltage Imbalance
Voltage imbalance on three-phase
systems can cause motor overheating
and premature failure. Maximum
allowable imbalance is 2.0%, and the
readings used to determine it must be
measured at the compressor terminals.
Voltage imbalance is defined as 100 times
the sum of the division of the three
voltages from the average voltage. If, for
example, the three measured voltages
are 221, 230, 227, the average would be:
RLA = Rated Load Amps
Compressor LRA = Locked Rotor Amps
Fan Motor LRA = Locked Rotor Amps,
N.E.C.Table 430 - 151
WARNING
FLA = Full Load Amps, N.E.C.
Table 430 - 150
Hazardous voltage!
(221+230+227) = 226 volts
3
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.
Voltage utilization range is 10 percent
Determination of Minimum Circuit
Ampacity (MCA)
MCA = 1.25 x largest motor amps (FLA
or RLA) + the sum of the remaining
motor amps.
The percentage of voltage imbalance is
then:
100*(226-221) = 2.2%
226
Determination of Maximum Fuse Size
(MFS)
In this example, 2.2 percent imbalance of
more than 2.0 percent exists, be sure to
check the voltage at the unit disconnect
and terminal block switch. If an imbalance
at the unit disconnect switch does not
exceed 2.0 percent, the imbalance is
caused by faulty wiring within the unit. Be
sure to conduct a thorough inspection of
the unit electrical wiring connections to
locate the fault, and make any repairs
necessary.
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electrical
requirements
Installation
Table I-ER-1. Integral Air-Cooled Standard Motor Electrical Data
Condenser
Fan Motor
Hp FLA
Evaporator
Fan Motor
Hp FLA
Unit
Size
Compressor
RLA LRA
Voltage
MCA MFS
5
208-230/60/3
460/60/3
575/60/3
19.3 135.0
8.2 61.8
6.6 49.4
1.5 4.42
2.00
1.0 3.15
1.42
31.7
13.7
11.0
50
20
15
1.60
1.14
7.5
10
15
208-230/60/3
460/60/3
25.0 179.0
12.0 101.0
9.8 74.0
2.0 5.81
2.63
1.5 4.42
2.00
41.5
19.6
16.0
60
30
25
575/60/3
2.10
1.60
208-230/60/3
460/60/3
575/60/3
19.3 135.0
8.2 61.8
6.6 49.4
2.0 5.81
2.63
2.0 5.81
2.63
55.0
23.7
19.1
70
30
25
2.10
2.10
208-230/60/3
460/60/3
575/60/3
25.0 179.0
12.0 101.0
9.8 74.0
5.0 13.70
6.18
3.0 8.32
3.76
78.3 100
36.9
30.0
45
35
4.94
3.01
Notes:
1.Voltage range: nominal voltage: 208-230V, acceptable range: 187 - 253V, nominal voltage: 380V, acceptable range: 342 - 416V,
nominal voltage: 460V, acceptable range: 414 - 506V, nominal voltage: 575V, acceptable range: 518 - 633V
2. Ampacity = (1.25 x compressor RLA) + the sum of the second compressor RLA (is used) and all other motor FLAs
3. MFS = (2.25 x compressor RLA) + the sum of the second compressor RLA (if used) and all other motor FLAs
Table I-ER-2. Integral Air-Cooled Oversized Motor Electrical Data
Condenser
Fan Motor
Hp FLA
Evaporator
Fan Motor
Hp FLA
Unit
Size
Compressor
RLA LRA
Voltage
MCA MFS
5.0
208-230/60/3
460/60/3
575/60/3
208-230/60/3
460/60/3
575/60/3
208-230/60/3
460/60/3
575/60/3
208-230/60/3
460/60/3
575/60/3
19.3 135.0
8.2 61.8
6.6 49.4
25.0 179.0
12.0 101.0
9.8 74.0
19.3 135.0
2.0 5.81
2.63
2.10
3.0 8.32
3.76
3.01
3.0 8.32
3.76
3.01
7.5 19.80
8.96
1.5 4.42
2.00
1.60
2.0 5.81
2.63
2.10
3.0 8.32
3.76
3.01
5.0 13.70
6.18
34.4
14.9
12.0
45.4
21.4
17.4
60.1
26.0
20.9
50
20
15
70
30
25
70
30
25
7.5
10.0
15.0
8.2
61.8
6.6 49.4
25.0 179.0
12.0 101.0
9.8 74.0
89.8 100
42.1
34.2
50
40
7.17
4.94
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 = (1.25 x compressor RLA) + the sum of the second compressor RLA (is used) and all other motor FLAs
3. MFS = (2.25 x compressor RLA) + the sum of the second compressor RLA (if used) and all other motor FLAs
14
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Installation
Procedure
Installation
Installation Checklist
Electrical Requirements
3. Remove the bolts holding the fan scroll
to support channels. Lift fan out through
the front of the unit.
4. Move the fan sheave to the opposite
end of the fan shaft.
5.Turn the fan scroll end-for-end and bolt
it to the support channels with the
discharge towards the back. Mounting
holes are provided in the fan scroll.
6. Align the fan and motor sheaves. Install
the belt and adjust the belt tension.
Refer toTableI-IP-1 for the correct belt
size. The belt should depress about one
inch under light pressure when
properly adjusted.
†Verify that the electrical power supply
characteristics comply with the unit
nameplate specifications.
The checklist listed below is a summary
of the steps required to successfully
install an integral air-cooled unit. 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.
†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.
WARNING
†Properly ground the unit.
Hazardous voltage!
Field Installed Control Wiring (Optional)
†Complete the field wiring connections.
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.
7. Reverse direction of the motor rotation
by exchanging any two of the three
motor wire connections.
8. Exchange the front and top panel
locations.
Note: All field installed wiring must
comply with NEC and applicable local
codes.
Fan Discharge Conversion
Refer to Figure I-IP-1 andTable I-IP-1
while following the steps below to
convert the fan discharge from vertical to
horizontal.
1. Remove the front and top fan section
panels.
2. Loosen the fan motor to release belt
tension. Remove the fan belt. Do not
force the belt over sheaves.
Table I-IP-1. Belt sizes for fan discharge conversion
discharge
General Unit Requirements
†Install and secure the ductwork to the
unit.
†Check unit for shipping damage and
material shortage. Refer to the
Receiving Checklist.
model
horizontal
A-34
vertical
A-42
SCIH050
SCIH075
SCIH100
SCIH150
A-34
A-42
B-35
B-42
B-30
B-38
FAN HOUSING IN VERTICAL
DISCHARGE POSITION
INSTALL SHEAVE ON
OPPOSITE END OF SHAFT
TURN FAN HOUSING END-FOR-END
FOR HORIZONTAL DISCHARGE
REWIRE MOTOR TO
REVERSE ROTATION
Figure I-IP-1. Converting fan to horizontal discharge
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Installation
Procedure
Installation
Low Ambient Damper
Installation
Reference Figure I-IP-2 and follow the
procedure below to install the low
ambient damper option.
1. Using a 1” hole saw, make a hole on
the right side of the condenser fan
discharge panel as shown. Install a 1”
bushing into the hole.
2. Apply the soft gasket material provided
around the damper as shown.
3. Place the damper over the discharge
opening using the screws (3/16 x 5/8”)
provided. See Detail A.
provided. Be sure the damper actuator
is in the closed position when installing.
5. Connect the capillary tube to the
pressure operator using the flare fitting.
Insert the tube through bushing
referenced in step 1. Route the capillary
tube to the liquid line on circuit #1.
6. Remove the end cap from the access
valve and attach to the end of the
capillary tube.
4. Install the damper actuator, which was
previously assembled to the mounting
bracket, to the right panel of the
damper using the four screws (1/4 x 5/8”)
CONDENSER FAN DISCHARGE PANEL
1" HOLE
(FIELD OPERATION)
SELF-DRILLING SCREW 3/16" X 5/8"
PROVIDED
SOFT GASKET
PROVIDED
DETAIL "A"
LIQUID LINE CIRCUIT #1
Figure I-IP-2. Low ambinet damper installation
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Installation
Procedure
Installation
Hydronic Coil Installation
Reference Figure I-IP-3 and follow the
procedure below to install the hydronic
coil.
1. Remove the front grill, filters, two
upper frame screws, and two lower
frame screws.
2. Install the hydronic coil in the space
previously occupied by the grill.
3. Use the frame screws and one of the
grill screws to clamp the coil end
supports between the unit frame and
the mounting brackets (supplied with
the coil).
removing the upper and lower filter
support brackets.
6. The hydronic coil can be installed for
either right or left-hand connections.
However, steam coils must have the
condensate lines connected to the
bottom outlet, with the top outlet
capped.
7. A heating coil control relay is factory
provided to use with BAY28X182 and
BAY28X183 thermostats. Drill two 5/32”
holes 7/16” apart and mount the relay in
the unit control box as shown in the
detail drawing below. Use a 6-32X.31
screw (not included) to mount the relay.
Connect wiring in accordance with the
thermostat wiring diagram.
4. Slide the filters in the filter rack from
either end of the coil.
5. Adjust the filter rack for 2-inch filters by
CONTROL BOX DETAIL
MOUNTING BRACKET (5)
FRAME SCREW (5)
FILTER SUPPORT BRACKET (2)
FILTER RACK
CENTER MOUNTING BRACKET
(USE GRILL MOUTING SCREW ON
7.5, 10, & 15-TON UNITS)
RELAY
Figure I-IP-3. Hydronic coil installation
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Installation
Procedure
Installation
Plenum Installation
3.Tighten the screws provided as shown.
Use screws on the rear, right, and left
sides through the pilot holes on the
plenum panels.
4. After the plenum is installed, adjust the
motor pulley for the correct airflow and
discharge grille for the correct airflow
direction.
Reference Figure I-IP-4 and follow the
procedure below to install the plenum.
1. Before installing the plenum, ensure
the evaporator fan is in the discharge
position. If not, see the fan discharge
conversion procedure on page 16.
2. Apply the soft gasket material provided
completely around the top of the unit
frame as shown in the detail drawing.
SOFT GASKET
(PROVIDED)
SELF-DRILLING
SCREW
1/4" X 1"
(PROVIDED)
A
31.5
Figure I-IP-4. Plenum installation
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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 on page 7.
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.
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.
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
‰Manually rotate the condenser and
evaporator fans to ensure free
movement.Verify that all of the fan
mounting hardware is tight.
Ductwork
‰Verify that all ductwork conforms to
NFPA 90A or 90B and all applicable
local codes.
“Receiving and Handling” section on
page 6.
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Installation
Startup
Unit Startup Procedures
Note: These units are equipped with high
efficiency scroll compressors. Check for
proper scroll rotation prior to operating
this unit.
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.
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
1. Check all electrical connections for
tightness.
2. Be sure all unit accessories are
properly set and installed.
3. Inspect all ductwork and duct
connections.
components could result in death or
serious injury.
4. Check for proper belt tension.
5. Check fan drive sheaves, pulleys, and
bearings.
6. Check condenser 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.
7. Allow unit to run until all system
temperatures and pressures stabilize.
8. Check systems for proper operation
and performance. Observe unit in
operation and check for unusual noise,
vibration, belt and fan clearances.
Unit Startup Checklist
1. Set thermostat to 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,
condenser fan(s), and compressor(s)
should start.
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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 continu-
ously, 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, the thermostat contacts
close to provide power to the evaporator
fan contactor, the condensing unit fan
contactor, and the condensing unit
compressor contactors. As the room
temperature reaches setpoint, the
thermostat contacts open to de-energize
all contactors, and 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
Table OS-O-1. Normal Operating Conditions
highpressure
low pressure
superheat
200 to 340 psig
54 to 80 psig
8 to 12oC
subcooling
5 to 10oC
liquid sightglass
current
refrigeration flow with no gas traces
must not surpass the rated current
Table O-OS-2. Controls Adjustment
Control
Disarming
Rearming
High pressure control
395 +/- 15 psig
25 +/- 8 psig
10 +/-3 psig
105oC
280 +/- 20 psig
80 +/- 12 psig
35 +/-5 psig
82oC
Low pressure control
Limit low pressure control
Motorwindingsthermostat
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general
information
Maintenance
Table M-GI-1. Integral Air-Cooled General Data
NominalTons
5
7.5
10
15
ARI capacity - btu/h
(S)EER
R22 charge/circuit (lbs.)
Shipping weight – lbs.
Operating weight – lbs.
Compressor, qty - hp
Circuits
60,600
10.471
14.3
908
848
1
91,000
10.36
9.3
1087
1027
1
121,900
10.38
11.7
1495
1445
2
177,200
9.76
9.2
1897
1767
2
1
1
2
2
Condenser
Face area, sq/ ft.
Rows / fpf
Fans, qty.
Fan size, in.
6.74
4 / 180
1
15x15
1.5
10.75
4 / 168
1
15x15
2.0
16.55
3 / 180
2
15x15
2.0
16.55
4 / 180
2
15x15
5.0
Motorhp
Evaporator
Face area, sq. ft
Rows / fpf
Filter qty. - size, in.
Fans qty. - size, in
Motorhp
5.99
4 / 144
2- 23.7x18
1- 12x12
1.0
8.32
4 / 144
2 - 23.7x25
1 - 12x12
1.5
12.82
4 / 144
3 - 23.7x25.6
2 - 12x12
2.0
12.82
4 / 144
3 - 23.7x25.6
2 - 12x12
3.0
Min. airflow
Max. airflow
1800
2200
2700
3300
3600
4400
5400
6600
Notes: 1. Net cooling capacity is rated at 95°F ambient, 80°F entering dry bulb and 67°F entering wet bulb at scfm air
condition. 2. EER is rated at ARI conditions.
Footnote 1. SEER applies to 5-ton unit--ARI 210-240 Certified.
22
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maintenance
procedures
Maintenance
Maintenance Procedures
Before beginning any maintenance
procedures heed all warnings and
cautions.
manufacturer instructions as closely as
possible to avoid potential damage to the
coil.
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.
WARNING
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.
WARNING
Hazardous chemicals!
Coil cleaning agents can be either
acidic or highly alkaline. Handle
chemicals carefully. Proper handling
should include goggles or face shield,
chemical resistant gloves, boots,
apron or 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.
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. Place solution in the sprayer. Be sure to
follow these guidelines if using a high-
pressure sprayer:
a) Minimum nozzle spray angle is 15°.
b) Spray solution at a 90° angle to the coil
face.
c) Keep sprayer nozzle at least six inches
form 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.
Periodic Maintenance Checklist
ꢀ Inspect coil surface for cleanliness.
Clean as required. Refer to “Coil
Cleaning” under “Maintenance
Procedures.”
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.”
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 condenser fans.
Note: If detergent is strongly alkaline (i.e.
has a pH value greater that 8.5 ) after
mixing, an aluminum corrosion inhibitor
must be added.
ꢀ Clean and repaint any corroded
surface.
Periodic Maintenance Procedures
This section describes specific
maintenance procedures that must be
preformed as a part of the normal
maintenance program for this unit. Be
certain to disconnect electrical power to
the unit before performing these
procedures.
Coil Cleaning Procedure
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.
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.
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
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
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maintenance
procedures
Maintenance
Refrigerant System
•To assist in reducing power generation
emissions, always attempt to improve
equipment performance with improved
maintenance and operations that will
help conserve energy resources.
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.
Follow theTrane 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
air conditioning or refrigerating
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.
Refrigerant LeakTesting
WARNING
Confined space hazard!
Do not work in confined spaces where
sufficient quantities of a 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 preperly to a potential hazard
could result in death or serious injury.
• 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 which
will pull the lowest possible system
vacuum while recovering and
condensing refrigerant into
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.
containment.
Refrigerant Evacuation
• When leak checking, be aware of any
new leak test methods which eliminate
refrigerant as a trace gas.
For field evacuation, use a rotary style
vacuum pump capable of pulling a
vacuum of 100 microns or less.
WARNING
Explosion hazard!
• 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 which have ozone depletion
factors. Properly dispose of used
materials.
•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 will reduce
refrigerant emissions and increase
equipment operating efficiencies.
Follow specific manufacturer’s
guidelines for conversion of existing
systems.
Use only dry nitrogen with a pressure
regulator for pressurizing unit. Do not
use acetylene, oxygen or compressed
air or mixtures containing them for
pressure testing. 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
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.
recommendations could result in
death or serious injury or equipment
or property-only damage.
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maintenance
procedures
Maintenance
CAUTION
Compressor damage!
CAUTION
Compressor damage!
Do not use a Meg ohm meter or apply
power to the winding of a compressor
while it is under a deep vacuum. This
may damage the motor windings.
Do not allow liquid refrigerant to enter
the suction line. Excessive liquid may
damage the compressor.
WARNING
CAUTION
Hazardous pressure!
Compressor damage!
Never manually or automatically
pump down below 7 psig.This may
cause the compressor to operate in a
vacuum and cause compresor
damage.
If heat is required to raise the
refrigerant pressure during
refrigerant removal, use only warm
water or heat blankets. Do not exceed
150°F. Do not apply a direct flame to
the refrigerant container. Failure to
follow thee safety precautions can
result in a violent explosion, which
could result in death or serious injury.
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.
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periodic
checklists
Maintenance
Periodic Checklists
Note: Perform this procedure monthly if
the unit is in a coastal or corrosive
environment.
Monthly Checklist
The following checklist provides the
recommended maintenance schedule to
keep the unit running efficiently.
Annual Maintenance
Check and tighten all set screws, bolts,
locking collars and sheaves.
1. Inspect, clean, and tighten all electrical
connections.
WARNING
Hazardous voltage!
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.
5. Inspect the thermal expansion valve
sensing bulbs for cleanliness, good
contact with the suction line, and
adequate insulation from ambient air.
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. 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,
WARNING
restricted airflow from dirty fins.
3. Check the fan belt condition and
tension. Adjust tension if belt is floppy or
squeals continually.
Live electrical components!
During installation, testing, servicing
and troubleshooting of this product, it
may be necessary to work with live
electrical components. Have a
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
interference with fan blades. Remove
obstructions and debris. Center the fan
wheel if necessary.
qualified licensed electrician or other
individual who has been 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.
4. Check the fan assembly sheave
alignment.Tighten set screws to their
proper torques.
26
SXIH-SVX01B-EN
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maintenance
procedures
Maintenance
Troubleshooting
Use the following steps and procedures to help correct these common problems.
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.
Problem
Remedy
The entire unit does not operate.
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.
Possible cause
1. Power interruption
2.Thermostat not operating
3. Electrical panel: a) 24-volt transformer
defective; b) loose wire
3. Correct as required.
Remedy
Problem
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.
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.
Fan runs but compressor does not start.
Possible cause
1. Low voltage
2. Remote thermostat
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
Remedy
Problem
1.Verify the airflow is uninterrupted. Also, verify that the low ambient damper is set
properly, allowing condensing temperatures of 90–135°F. Reset high pressure
switch to start.
Unit held off by safety.
Possible cause
1. Unit cutout on high pressure control, set at
385 psig
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.
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
5. Replace, if defective.
6. Evacuate, replace element, recharge.
7.Trace and firm up connection.
Problem
Noisy operation.
Possible cause
Remedy
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.
1. Copper tubing vibrating
2. Machine vibrating out of level
3. Loose cabinet or internal component
4. Loose fan wheel
5. Blower wheel hitting shroud
6. Blower motor bearing defective
7. Blower bearing defectiv
7. Replace fan bearing.
SXIH-SVX01B-EN
27
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maintenance
procedures
Maintenance
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.
Problem
Remedy
Insufficient cooling
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.
Possible cause
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. 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.
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 outlet
cold
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
in 2-circuit units
Problem
Remedy
Unit short cycles
1. Repair or replace.
Possible cause
2.Trace and repair.
3. Repair or replace.
4. Flush or blow dirt out of coil.
5. Reclaim, evacuate, recharge per nameplate.
1. Remote thermostat
2. Loose connection in electrical unit
3. Thermostat contacts fluttering
4. Air flow to evaporator is restricted
5. Insufficient charge
Problem
Remedy
Compressor starts and runs, but fan does
not run.
1. Replace.
2. Replace.
3. Adjust fan mounting.
Possible cause
1. Faulty switch
2. Open fan motor coil circuit
3. Fan binding on shroud or venturi ring
28
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SXIH-SVX01B-EN
Literature Order Number
Date
September 2007
SXIH-SVX01B-EN June 2007
Supersedes
Trane
A business of American Standard Companies
Trane has a policy of continuous product and product data improvement and reserves the right to change
design and specifications without notice.
For more information, contact your localTrane office
or e-mail us at [email protected]
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