Trane Air Conditioner SCIH User Manual

Installation, Operation,  
and Maintenance  
Integral Air-Cooled  
Self-Contained Unit  
Model SCIH  
AO” and later design sequence  
September 2007  
SXIH-SVX01B-EN  
 
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  
SXIH-SVX01B-EN  
3
 
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
SXIH-SVX01B-EN  
 
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  
SXIH-SVX01B-EN  
5
 
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
SXIH-SVX01B-EN  
 
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 11F. 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 receivers  
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 carriers 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 units 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  
SXIH-SVX01B-EN  
7
 
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
SXIH-SVX01B-EN  
 
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  
SXIH-SVX01B-EN  
9
 
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  
SXIH-SVX01B-EN  
 
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  
SXIH-SVX01B-EN  
11  
 
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  
SXIH-SVX01B-EN  
 
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 installers 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.  
SXIH-SVX01B-EN  
13  
 
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  
SXIH-SVX01B-EN  
 
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  
SXIH-SVX01B-EN  
15  
 
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  
16  
SXIH-SVX01B-EN  
 
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  
SXIH-SVX01B-EN  
17  
 
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  
18  
SXIH-SVX01B-EN  
 
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.  
SXIH-SVX01B-EN  
19  
 
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.  
20  
SXIH-SVX01B-EN  
 
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  
SXIH-SVX01B-EN  
21  
 
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  
SXIH-SVX01B-EN  
 
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  
manufacturers 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  
manufacturers 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  
SXIH-SVX01B-EN  
23  
 
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 manufacturers  
recommendations that will reduce  
refrigerant emissions and increase  
equipment operating efficiencies.  
Follow specific manufacturers  
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  
manufacturers directions.  
recommendations could result in  
death or serious injury or equipment  
or property-only damage.  
24  
SXIH-SVX01B-EN  
 
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.  
SXIH-SVX01B-EN  
25  
 
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  
 
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  
 
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  
SXIH-SVX01B-EN  
 
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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