InstallationOperationMaintenance
Air-Cooled Self ContainedAir Conditioner 7.5-20 TonsSRUB Model 50Hz
Jan 2002 SRUB-IOM001-EN
Single Compressor Dual CompressorsSRUB 080 SRUB 160SRUB 110 SRUB 190SRUB 130 SRUB 220
SRUB 250
2 SRUB-IOM001-EN
Model Nomenclature
Air-Cooled Self-ContainedModel Nomenclature
S R U B 0 8 0 A D 0 1 B A
SRUB = Self-Contained Air-Cooled
Service Digit
Minor Design Sequence
Factory Installed Options
01 = Arrangement 1
02 = Arrangement 2
03 = Arrangement 3
04 = Arrangement 4
Electrical Characteristics
D = 380-415/3/50
Compressor
A = Single Compressor
B = Dual Compressors
Nominal Gross Cooling Capacity (MBh)
080 = 85 MBh
110 = 110 MBh
130 = 130 MBh
160 = 160 MBh
190 = 190 MBh
220 = 220 MBh
250 = 250 MBh
SRUB-IOM001-EN 3
Contents
Model Nomenclature 2
General Data 4
Application Considerations 5
Outline For Installation 6
General Information 8
Installation 9
Unit Installation 10
Installation Checklist 11
Refrigerant Charging and Evacuation 12
Electrical Wiring 14
Electrical Information 20
Operation and Start-up 21
Maintenance 22
4 SRUB-IOM001-EN
Aluminum Fin with Copper Tube
Totally Enclosed - Fan Cooled , Three Phase Induction Motor
Forward Curved Centrifugal Fan
Forward Curved Centrifugal Fan
General Data
080 110 130 160 190 220 250
POWER CONN. - V / PH / Hz 380/3/50 380/3/50 380/3/50 380/3/50 380/3/50 380/3/50 380/3/50
REFRIGERANT R22 R22 R22 R22 R22 R22 R22
CONDENSING UNIT
FAN
Type
Dia X Width (in) 15 x 15 12 x 15 12 x 15 15 x 15 15 x 15 15 x 15 15 x 15
No. Used 1 2 2 2 2 2 2
Drives Belt Drive Belt Drive Belt Drive Belt Drive Belt Drive Belt Drive Belt Drive
MOTOR
Type
No. Used - HP 1 - 2 1 - 3 1 - 3 1 - 5 1 - 5 1 - 5 1 - 7.5
Speed - RPM 1420 1420 1420 1430 1430 1430 1440
V / PH / Hz 380/3/50 380/3/50 380/3/50 380/3/50 380/3/50 380/3/50 380/3/50
FLA - LRA 3.3 - 19.0 4.8 - 28.0 4.8 - 28.0 7.5 - 50.0 7.5 - 50.0 7.5 - 50.0 11.0 - 76.0
COIL
Type
Fin Type - FPI Louver - 12 Louver - 12 Louver - 12 Louver - 12 Louver - 12 Louver - 12 Louver - 14
Tube Type - Size Plain - 3/8 Plain - 3/8 Plain - 3/8 Plain - 3/8 Plain - 3/8 Plain - 3/8 Plain - 3/8
No. of Rows 4 4 5 4 5 5 5
Face Area - Sq.Ft. 9.06 12.5 12.5 17.22 17.22 20.14 20.14
No. of Refrigeration Circuit 1 1 1 2 2 2 2
COMPRESSOR
RLA - LRA 16.4 - 95.0 19.2 - 125.0 19.6 - 125.0 16.4 - 95.0 16.4 - 95.0 19.2 - 125.0 19.6 - 125.0
19.2 - 125.0
Internal Overload Protection x x x x x x x
Spring Isolator - - - - - - -
Grommet x x x x x x x
FAN COIL UNIT
FAN
Type
Dia X Width (in) 12 x 15 12 x 15 12 x 15 15 x 15 15 x 15 15 x 12 15 x 12
No. Used 1 1 1 1 1 2 2
Drives Belt Drive Belt Drive Belt Drive Belt Drive Belt Drive Belt Drive Belt Drive
MOTOR
Type
No. Used - HP 1 - 1 1 - 2 1 - 2 1 - 3 1 - 3 1 - 3 1 - 5
Speed - RPM 1420 1420 1420 1420 1420 1420 1430
V / PH / Hz 380/3/50 380/3/50 380/3/50 380/3/50 380/3/50 380/3/50 380/3/50
FLA - LRA 1.8 - 10.6 3.3 - 19.0 3.3 - 19.0 4.8 - 28.0 4.8 - 28.0 4.8 - 28.0 7.5 - 50.0
COIL
Type
Fin Type - FPI Corrugated - 12 Corrugated - 12 Corrugated - 12 Corrugated - 12 Corrugated - 12 Corrugated - 12 Corrugated - 14
Tube Type - Size Plain - 3/8 Plain - 3/8 Plain - 3/8 Plain - 3/8 Plain - 3/8 Plain - 3/8 Plain - 3/8
No. of Rows 3 3 3 3 4 4 4
Face Area - Sq.Ft. 7.22 10.83 10.83 12.92 12.92 15 15
No. of Refrigeration Circuit 1 1 1 2 2 2 2
UNIT WEIGHT
Weight Approx. ( Kgs ) 522 638 678 814 968 1062 1070
Item Model
Totally Enclosed - Fan Cooled , Three Phase Induction Motor
Aluminum Fin with Copper Tube
SRUB-IOM001-EN 5
Application Considerations
FRESH AIR IN
CONDENSER AIR OUT
CONDENSER AIR IN
RETURN AIR
UNIT LOCATED INSIDE EQUIPMENT ROOM
CONDENSER AIR IN
CONDENSER AIR OUT
RE
TU
RN
AIR
UNIT LOCATED REMOTE
RETURN AIR
ROOM SERIES AS
RETURN AIR PLENUM
FRESH AIR IN
CONDENSER AIR OUT
CONDENSER AIR IN
INTERIOR WALL
FROM CONDENSER AIR SUPPLY
USING EQUIPMENT ROOM
AS RETURN AIR PLENUM
TO OUTSIDE
FROM CONDENSER AIR SUPPLY
UNIT LOCATED REMOTE
RE
TU
RN
AIR
CONDENSER AIR OUT
CONDENSER AIR IN
TO OUTSIDE
CONDENSER AIR IN
CONDENSER AIR OUT
RETURN AIR
FRESH AIR
+
UNIT LOCATED INSIDE EQUIPMENT ROOM
CONDENSER AIR OUT
CONDENSER AIR IN
RETURN AIR PLENUM
ROOM SERIES AS
FRESH AIR IN
RETURN AIR
INTERIOR WALL
AS RETURN AIR PLENUM
USING EQUIPMENT ROOM
ARRANGEMENT 4
ARRANGEMENT 3
SUPPLY AIR SUPPLY AIR SUPPLY AIR
SU
PP
LY A
IR
SU
PP
LY A
IR
SUPPLY AIR
FRESH AIR IN
CONDENSER AIR OUT
CONDENSER AIR IN
SUPPLY AIR
RETURN AIR
UNIT LOCATED INSIDE EQUIPMENT ROOM
CONDENSER AIR IN
CONDENSER AIR OUT
RE
TU
RN
AIR
SU
PP
LY A
IR
UNIT LOCATED REMOTE
SUPPLY AIR
RETURN AIR
ROOM SERIES AS
RETURN AIR PLENUM
FRESH AIR IN
CONDENSER AIR OUT
CONDENSER AIR IN
INTERIOR WALL
FROM CONDENSER AIR SUPPLY
USING EQUIPMENT ROOM
AS RETURN AIR PLENUM
TO OUTSIDE
FROM CONDENSER AIR SUPPLY
UNIT LOCATED REMOTE
SU
PP
LY A
IR
RE
TU
RN
AIR
CONDENSER AIR OUT
CONDENSER AIR IN
SUPPLY AIR
TO OUTSIDE
CONDENSER AIR IN
CONDENSER AIR OUT
RETURN AIR
FRESH AIR
+
UNIT LOCATED INSIDE EQUIPMENT ROOM
CONDENSER AIR OUT
CONDENSER AIR IN
RETURN AIR PLENUM
ROOM SERIES AS
FRESH AIR IN
RETURN AIR
SUPPLY AIR
INTERIOR WALL
AS RETURN AIR PLENUM
USING EQUIPMENT ROOM
ARRANGEMENT 2
ARRANGEMENT 1
6 SRUB-IOM001-EN
Outline For Installation
SRUB 080
SRUB 110/130
Outline dimension SRUB
MODEL A B C D E F G H I J K L M
SRUB 080 50 1/2 29 1/2 54 16 1/16 18 7/8 16 - 9 13 7/8 7 1/2 - 29 1/8 36 7/16
SRUB 110/130 67 29 1/2 47 24 1/16 18 7/8 16 12 9 13 7/8 7 1/2 - 29 1/8 31 3/4
Note: All dimensional date are in inch.
A
D E D
1/2
H
J I
2 5/16
1 1/2
9/16
7 13
/16
5
10 5
/16
12 1
3/16
4 1/8
Ø 3/4 KNOCKOUT FOR CONTROL WIRING(BOTH ENDS)
Ø 1 1/4 KNOCKOUTFOR UNIT POWER(BOTH ENDS)
Ø 3/4 F.P.T.CONDENSATE DRAIN CONN. (THIS END)
F
PILOT RED LAMP
START BUTTON
STOP BUTTON
L
BC
M
11/2 M
13/1
6
A
D E D
1/2
F F
H
J I 2 5/16
1 1/2
9/16
7 13
/16
5
10 5
/16
12 1
3/16
4 1/8
Ø 3/4 KNOCKOUT FOR CONTROL WIRING(BOTH ENDS)
Ø 1 1/4 KNOCKOUTFOR UNIT POWER(BOTH ENDS)
Ø 3/4 F.P.T.CONDENSATE DRAIN CONN. (THIS END)
PILOT RED LAMP
STOP BUTTON
START BUTTON
M 11/2
13/1
6
L
CB
SRUB-IOM001-EN 7
SRUB 160/190
SRUB 220/250
Outline For Installation
Outline dimension SRUB
MODEL A B C D E F G H I J K L M
SRUB 160/190 69 34 3/4 58 25 1/16 18 7/8 19 18 1/2 10 16 1/4 9 7/8 - 39 1/16 36 3/4
SRUB 220/250 79 1/2 34 3/4 58 17 1/16 16 19 18 1/2 10 16 1/4 8 7/8 13 3/8 39 1/16 36 1/4
Note: All dimensional date are in inch.
A
D E D
F F
J I
H
4 1/8
5
7 13
/16
10 5
/16
12 1
3/16
2 5/16
1 1/2
9/16
Ø 3/4 F.P.T. CONDENSATE DRAIN CONN. (THIS END)
Ø 3/4 KNOCKOUT FOR CONTROL WIRING(BOTH ENDS)
Ø 1 1/4 KNOCKOUT FOR UNIT POWER (BOTH ENDS)
PILOT RED LAMP
START BUTTON
STOP BUTTON13/1
6
M 1 1/21/2
L
CB
1/2
A
D E K E
H
F F
J I
2 5/16
1 1/2
9/16
1 1/
4
Ø 3/4 F.P.T.CONDENSATE DRAINCONN. (THIS END)
11/2
57
13/1
6
10 5
/16
12 1
3/16
4 1/8
Ø 3/4 KNOCKOUTFOR CONTROL WIRING(BOTH ENDS)
Ø 1 1/4 KNOCKOUT FOR UNIT POWER (BOTH ENDS)
1/2
PILOT RED LAMP
START BUTTON
STOP BUTTON13/1
6
L
M
CB
8 SRUB-IOM001-EN
General Information
ForewordThese instructions do not attempt to cover all variations insystems, nor to provide for every possible contingency to be
met in connection with installation. Should further informationbe desired or should particular problems arise which are not
sufficiently covered for the purchaser’s purpose, the mattershould be referred to the manufacturer.
ReceptionOn arrival, inspect the unit before signing the delivery note.
Specify any damage on the delivery note, and senda registered letter of protest to the last carrier of the goods within
72 hours of delivery. Notify the local Trane Sales Office at thesame time. The unit should be totally inspected within 15 days
of delivery. If any concealed damage is discovered, stopunpacking the shipment. Take photos of the damage material,
if possible. Notify the carrier immediately by phone and
registered mail. Notify the local Trane Sales Office. Concealeddamage must be report within 15 days of delivery. Check the
unit nameplated to confirm that the proper unit was shipped.Available power supply must be compatible with electrical
characteristics specified on component nameplates.
General InformationThis manual covers the Installation, Operation, and Mainte-
nance of the SRUB080, SRUB 110 and SRUB 130 single
circuit, and the SRUB 160, SRUB 190, SRUB 220 and SRUB250 dual circuit. These new package air-cooled self contain
models are completely redesigned for a scroll compressor,improved application flexibility, servicing and maintenance
accessibility, and an improved accessory line. They are of thevertical or horizontal discharge with the vertical standard.
Note : “Warnings” and “Cautions” appear at appropriate
places in this manual. Your personal safety and the properoperation of this machine require that you follow them
carefully. The manufacturer assumes no liability for installation
or servicing performed by unqualified personal.
Special Note on Refrigeration EmissionsWorld environmental scientists have concluded, based onthe best currently available evidence, that ozone in our
upper atmosphere is being reduced due to release of CFCfully halogenated compounds.
The Trane Company urges all HVAC servicers working on
Trane equipment, or any manufacturer’s products, makeevery effort to eliminate, if possible, or vigorously reducethe emission of C F C, H C F C, and H F C refrigerants to
the atmosphere resulting from installation, operation,routine maintenance, or major service on this equipment.
Always act in a responsible manner to conserve refrigerantsfor continued use even when acceptable alternatives are
available.
Unit InspectionInspect material carefully for any shipping damage. Ifdamaged, it must be reported to, and claims made against the
transportation company. Compare the information that appearson the unit nameplate with ordering and submittal data to
insure the proper unit was shipped. Available power supplymust be compatible with electrical characteristics specified on
component nameplates. Replace damaged parts withauthorized parts only.
WARNING : Open and lock unit disconnect toprevent injury or death from electric shock or contactwith moving parts before attempting any installationor maintenance.
SRUB-IOM001-EN 9
A
B
C
Installation
Lifting RecommendationsBefore preparing the unit for lifting, estimate the approximatecenter of gravity for lifting safety. Because of placement of
internal components, the unit weight may be unevenlydistributed.
Warning : On-sight lifting equipment must be capable of
lifting the unit weight with an adequate safety factor. The use
of under-capacity lifting devices may result in severe personalinjury or death and can seriously damage the unit.
The crated unit can be moved using a forklift of suitable
capacity. For lifting the unit, attach lifting straps or slingssecurely to the lifting holes at each corner. Use spreader bars
to protect the unit casing from damage. Test lift the unit todetermine proper balance and stability.
Caution : Use spreader bars to prevent lifting straps fromdamaging the unit. Install bars between lifting straps. This will
prevent the straps from crushing the unit cabinet or damagingthe unit finish.
Figure 1: Space Requirement for SRUB Model
Table 1: Show Space Requirement for SRUB Model
Inspection ChecklistTo protect against loss due to damage incurred in transit,complete the following checklist upon receipt of the unit.
� Inspect individual pieces of the shipment before acceptingthe unit. Check for obvious damage to the unit or packing
material.� Inspect the unit for concealed damage before it is stored
and as soon as possible after delivery. Concealed damage
must be reported within 15 days. If consealed damage isdiscovered, stop unpacking the shipment. Do not remove
damaged material from the receiving location. Takephotos of the damage if possible. The owner must provide
reasonable evidence that the damage did not occur afterdelivery.
� Notify the carrier’s terminal of damage immediately byphone and by mail. Request an immediate joint inspection
of the damage by the carrier and the consignee.
� Notify the sales representative and arrange for repair.Do not repair the unit until the damage is inspected by the
carrier’s representative.
Note : All dimension are inch
10 SRUB-IOM001-EN
SRUB 080 522 (1150)
SRUB 110 638 (1407)
SRUB 130 678 (1495)
SRUB 160 814 (1795)
SRUB 190 968 (2134)
SRUB 220 1062 (2341)
SRUB 250 1070 (2359)
Unit InstallationUnit Installation
Figure 2 : SRUB Supply and Return Air Duct Connections
Table 2: Total Unit Weight
ModelWeight
kg (lb)
Installation Considerations1. The floor or foundation for the unit must be level, solid and of sufficient strength to
support the unit the floor before positioning the air conditioner.
2. Allow minimum recommended clearances for maintenance and routine service.
Refer to “Service Data”. See in figure 13. Available power supply must agree with electrical data on component nameplate.
4. If external accessories are installed on the unit, additional clearance must beprovided.
5. All duct word should be properly insulated to prevent condensation and heat loss.6. If adding external accessories to the unit, additional clearances must be
considered for the overall space needed.7. For installation of accessories available for this unit follow the instructions packed
with each accessory.
Supply Air
3 Fan Diameters
3-Inch Flexible Duct
Return Air
SRUB-IOM001-EN 11
Installation Checklist
Complete this checklist as the unit is installed to verify that all
recommended installation procedures are accomplishedbefore the unit is started. This checklist does not replace the
detailed instruction given in appropriate sections or thismanual. Always read the entire section carefully to become
familiar with the procedures.
Receiving❑ Unit and components are inspected for shipping damage.
File damage claims immediately with the delivering carrier.
❑ Unit is checked for missing material. Look for ship-with
drives, filters that are packaged separately, placed insidethe main control panel, fan section, or secured to the bottom
of the compressor section.❑ Check nameplate unit data so that it matches the sales
order requirements.
Unit Location❑ Crating is removed and cleared form the unit. Do not
remove the shipping skid until the unit is set in its final
position.❑ Unit Location is adequate for unit dimension and all
ductwork, piping and electrical connections.❑ Access and maintenance clearances around the unit are
adequate. Allow space at the end of the unit for shaft andconsider servicing.
Unit Mounting❑ Unit is placed in its final location.❑ Shipping skid bolts and shipping skid are removed.
❑ Unit properly pitched in direction of drain pan outlet.
❑ Unit properly mounted on isolators (if used).❑ Compressor and supply fan properly isolated.
❑ Unit protective shipping covers removed.
Component Overview❑ Fan and motor shafts are parallel.
❑ Fan and motor sheaves are aligned.❑ Belt tension is properly adjusted.
❑ Fan rotates freely.
WARNING : Disconnect electrical powersource to prevent injury or death from electrical shock.
❑ Locking screws, bearing setscrews and sheave setscrews
are tightened to their proper torques.❑ Bearing locking collars do not wobble when rotated.
Ductwork❑ Return ductwork (if used) to the unit is secure, with three
inches of flexible duct connector.
❑ Discharge duct extends upward without change in size or
direction for at least three fan diameters.❑ Discharge ductwork utilizes a three-inch flexible duct
connection.❑ Trunk ductwork to terminal units is complete and secured
to prevent leaks.
Controls❑ Static pressure adjusted. Pressure head assembly is
installed in the discharge duct.
❑ Space temperature sensor is mounted in an area that isnot subjected to drafts of “dead” spots behind doors or in
comers; hot to cold air from duct; radiant heat from the sunor appliances, concealed pipes and chimneys.
Electrical Wiring❑ Check for a complete set of wiring diagrams mounted on
the inside of the control panel door.
❑ Supply power (line voltage) is brought through a fused
disconnect switch to the control panel terminal board 2TB.Check for proper phase sequence.
❑ Check all contactor lugs for tightness.
12 SRUB-IOM001-EN
Refrigerant Chargingand Evacuation
Caution� Refrigerant “R22” only.� Always evacuate air from the tubing before adding
refrigerant.� Add refrigerant through the charging port of liquid line valve
after the completion of evacuation.� The refrigerant provided by the manufacturer meets all the
requirement of our units. When using recycled or
reprocessed refrigerant, it is advisable to ensure its qualityis equivalent to that of a new refrigerant. For this, it is
necessary to have a precise analysis made by aspecialized laboratory. If this condition is not respected, the
manufacturer’s warranty could be cancelled.
Gaseous ChargingThis procedure is accomplished with the unit operating.
Electrical connections must be complete. Do not proceed until
the system is ready to operate.
Procedure1. Open liquid valve that refrigerant go through system and
open suction valve.
2. Turn on power to the unit. Allow the system to run for five toten minutes to stabilize operating conditions.
3. Measure airflow across the evaporator coil. Compare themeasurements with the fan performance data in the Data/
Submittal or Service Facts. Once proper airflow is
established, observe the suction and head pressure gaugeson the gauge manifold. Pressure reading should fall
approximately at the points shown by the pressure curvesin Service Facts. Add or remove refrigerant (gas only) as
required to obtain correct head and suction pressure. Checksuction line superheat and condenser sub-cooling to
ensure the unit is operating properly.4. Disconnect all power to the unit.
5. Remove the charging system from the unit and close the
opening in the bottom of the control box with the pivotalcover before attempting to replace access panel.
6. Replace all the panels.
SRUB-IOM001-EN 13
Refrigerant ChargingThe initial volume of refrigerant should be charged into thehigh side of the system, in liquid form, through the liquid line
charging valve. The following procedure is suitable for mostsystems.
1. Connect a cylinder of refrigerant and connect manifold
gauge as the figure 3. Before tightening the connection at
the charging valve, crack the valve on the refrigerantcylinder and allow enough refrigerant gas to escape through
the loose connection to purge air from the connection topurge air from the connecting line. Tighten the connection.
2. Close the system electrical disconnect switches and the
unit on-off switch. Start the system fan.
3. Open the valve on the cylinder and then the liquid line
charging valve, allowing liquid refrigerant to enter thesystem.
4. Continue charging until the estimated refrigerant charge has
entered the system. At this point, close the liquid linecharging valve and the refrigerant cylinder.
5. Allow the system to continue to operate, frequently
checking the liquid line sight glass and the compressor
suction and discharge pressure gauge readings.
6. Check superheat, supply air temperature and return airtemperature. If the system need more refrigerant, charging
it to suction line charging valve.
7. It is good practice to leave the refrigerant drum connectedto the charging valve until the system has completed its 24
hour test run. This permits the addition or removal ofrefrigerant, as necessary to establish proper system charge.
ModelTotal Refrigerant Charge
kg lb
SRUB080 8.70 19.17
SRUB110 11.45 25.25
SRUB130 12.81 28.25
SRUB160 14.70 32.41
SRUB190 15.61 34.41
SRUB220 19.76 43.56
SRUB250 22.48 49.56
Figure 3
ManifoldGauges
Liquid LineGauge Port
Liquid LineService Valve
Suction Line Gauge Port
Suction Line Service Valve
Table 3: Refrigerant Charging for 50 HzDomestic SRUB Model
Refrigerant Chargingand Evacuation
14 SRUB-IOM001-EN
Electrical Wiring
SRUB-IOM001-EN 15
Electrical Wiring
16 SRUB-IOM001-EN
Electrical Wiring
SRUB-IOM001-EN 17
Electrical Wiring
18 SRUB-IOM001-EN
Electrical Wiring
Trane Scroll CompressorsBecause Trane scroll compressors are uniquely differentfrom traditional reciprocating compressors, their operating
characteristics and requirements represent a departure fromreciprocating compressor technology.
WARNING : Avoid contact with the top of thescroll compressor. It becomes hot during normal operation.
Compressor Electrical PhasingProper phasing of the electrical power wiring is critical for
proper operation and reliability of the scroll compressor.Figure 4 illustrates correct supply power phasing for the scroll
compressor.
Proper rotation of the scroll compressor must be established
before the machine is started. This is accomplished byconfirming that the electrical phase sequence of the power
supply is correct. The motor is internally connected forclockwise rotation with the inlet power supply phased A,B,C.
To confirm the correct phase sequence (ABC), use a Model
45 Associated Research Phase indicator or equivalent.See Figure 5
Voltages generated in each phase of a polyphase alternator
or circuit are called phase voltages. In a three-phase circuit,three sine wave voltages are generated, differing in phase
by 120 electrical degrees. The order in which the threevoltages of a three-phase system succeed one another is
called phase sequence or phase rotation. This is determinedby the direction of rotation of the alternator. When rotation is
clockwise, phase sequence is usually called “ABC”, when
counterclockwise, “CBA”.
This direction may be reversed outside the alternator byinterchanging any two of the line wires. It is this possible
interchange of wiring that makes a phase sequence indicatornecessary if the operator is to quickly determine the phase
rotation of the motor.
Correcting Improper Electrical Phase SequenceProper compressor motor electrical phasing can be quicklydetermined and corrected before starting the unit. Use a quality
instrument such as an Associated Research Model 45 PhaseSequence Indicator and follow this procedure.
1. Open the electrical disconnect or circuit protection switch
that provides line power to the line power terminal block inthe control panel (or to the unit-mounted disconnect).
2. Connect the phase sequence indicator leads to the 1TB asfollows:
Phase seq. Lead 1TB Terminal
Yellow (Phase A)............. L1Blue (Phase B)............. L2
Black (Phase C).............L3Refer to Figure 6
3. Read the phase sequence on the indicator after turning
power on by closing the unit supply power fused disconnect.
The “ABC” Indicator on the face of the phase indicator willglow if phase is ABC.
WARNING : To prevent injury or death due toelectrocution, take extreme care when performing serviceprocedures with electrical power energized.
Figure 4
Co
nn
ect
To C
on
trac
tor
Internal MotorWiring Diagram
External MotorWiring Diagram
T1 (Phase A)
T2 (Phase B)
T1
T2 T3
T3 (Phase C)
SRUB-IOM001-EN 19
Electrical Wiring
4. If the “CBA” indicator glows instead, open the unit main
power disconnect located upstream of the unit, and switchtwo line leads on 1TB. Reclose the main power disconnect
and recheck phasing.
5. Disconnect the phase indicator.
Diagnose of scroll compressor when it turns in reverse
direction.❑ Compressor cannot compress the refrigerant (Pressure will
not increase at high pressure side.)❑ Compressor will operate loudly.
❑ The current (Amps) will be lower. Switch two line leads on1TB and check again. If the diagnosis still persists, please
contact Trane sales office.
Figure 5 :Associated Research Model 45Phase Sequence Indicator
Figure 6 :Terminal Block 1TBPhase Sequencing
CUSTOMER POWERWIRE ENTRY
SRUB Control Panel
LINE VOLTAGE
L1
PHASE A
L2
PHASE B
L3
PHASE C
T1
PHASE A
T2
PHASE B T3
PHASE C
1TB
Black
Red
Yellow
20 SRUB-IOM001-EN
Electrical Information
Unit VoltageElectrical power to the unit must meet stringent requirementsfor the unit to operate properly. Total voltage supply and voltage
imbalance between phases should be within the followingtolerances.
Voltage SupplyMeasure each leg of supply voltage at all line voltage
disconnect switches. Readings must fall within the voltageutilization range shown on the unit nameplate. If voltage on
any leg does not fall within tolerance, notify the powercompany to correct this situation before operating the unit.
Inadequate voltage to the unit will cause control componentsto malfunction and shorten the life of electrical components
and compressor motors.
Voltage ImbalanceExcessive voltage imbalance between phases in a three-phasesystem will cause motors to overheat and eventually fail.
Maximum allowable imbalance is 2 percent. Voltage imbalanceis defined as follows:
% Voltage Imbalance =100 x [VA - VD]
VA
Where VA = = (Avg. Voltage)
V1,V2,V3 = Line Voltage
VD = Line Voltage that deviates farthest from VA.
Example :If the three voltages measured at the line voltage fuseddisconnect are 370 volts, 381 volts and 384 volts, the average
(VA) would be:
V1+V2+V3
3
= 378.3 volts.
VD = 370
The percentage of imbalance is then:
370 + 381 +3843
= 2.2%100 x [378.3 - 370]
378.3
The 2.2 percent imbalance that exists in the example above
exceeds maximum allowable imbalance by 0.2 percent. Thismuch imbalance between phases can equal as much as 20
percent current imbalance with a resulting increase in windingtemperature that will decrease compressor motor life.
SRUB-IOM001-EN 21
Operation and start-up
Start-upBefore start-up, confirm the following1. Shipping spacer at compressor base if any, had been
removed.2. Ensure sufficient cooling load is available at the day of
startup (Min. 50% design load).3. Check if duct is firmly connected to the fan discharge with
a flexible duct. The flexible duct must be loose.
4. Check and ensure that the balancing dampers are opened.5. Check the condition and tension of the fan belts.
6. Compressor oil should be visible in the sight glass.7. Check voltage at all compressor terminals.
8. Check voltage imbalance. Maximum allowable voltageimbalance, phase to phase is 2%.
To Start Unit1. Turn on the unit power switch
2. Check the fan for direction of rotation.3. Turn the rotary switch of the thermostat (field supplied)
to “cool” position.
OperationUnit is operated by positioning the fan switch at “cool”(Please ensure there are at least a minimum of 50% design
load)
Seasonal Start-up Procedure.1. Perform the applicable procedures outlined under “Annual
maintenance” in the Maintenance section.
2. Test the entire refrigerant system for leaks.3. Start the system.
4. Check the operation of all interlocked equipments.5. Check the compressor oil level and system operating pres
sures after the system has stabilized (About 15 to 20minutes).
6. Observe the flow of refrigerant through sight-glass. If bubbleappears, re-check the system for leaks.
7. Check for adequate subcooling.
Note : Normal oil level on the manifolded compressorsCould be any where from low to 3/4 of the oil sight glass.
Note : All units do not have liquid solinoid valves. Liquidsolinoid valves are not required nor recommended.
22 SRUB-IOM001-EN
Maintenance
MaintenanceThe following maintenance procedures are given as anessential part of the required maintenance of the required
maintenance or this equipment. However, the services of aqualified service technician are required to perform the
periodic maintenance procedures as a part of a regularmaintenance contract.
WARNING : Disconnect power source andallow all rotating equipment to stop completely beforeservicing or inspecting the unit. Failure to do so may resultin injury or death.
Weekly Maintenance❑ Check the liquid line sight-glass. Presence of bubbles
indicates possible shortage of refrigerant or dirty liquid linefilter driers.
❑ A noticable temperature drop across the filter driers (morethan 5 deg. F) indicates dirt or obstruction in the filter
driers. Replace filter drier if necessary.
Monthly Maintenance❑ Inspect unit air filters. Clean or replace if filters are dirty
and blocking air flow.
❑ Inspect coils for excess moisture or icing. Icing may be dueto restricted air flow or shortage of refrigerant flow across
the coil.❑ Check condensate flow though drainpipe. Remove any
obstructions or algae if found.❑ Check tension and condition of fan belts.
Six Month Interval❑ With power disconnected, manually rotate the fan wheel to
check for obstructions in the housing.
❑ Check alignment of fan assemble sheaves. Tighten setscrewsfor their proper torques.
Note : Belt tensions should be checked and adjusted atleast twice during the first few days of new belt operation.
Annual Maintenance❑ Check and tighten all setscrews, bolts, locking collars and
sheaves.
❑ Inspect, clean and tighten all electrical connections.❑ Inspect the TXV sensing bulbs for cleanliness, good
contact with suction line and insulated from ambient.❑ Check superheat setting of TXV. It should be 12 F to 17 F.
❑ Drain the condenser water system and thoroughly inspect
for fouling. Clean the condensers.
Required Unit Service EnvelopeThe following summarizes the envelope around each unit size
which is required for proper service access. The assumptionin establishing these service envelopes are listed below:
1. Service envelopes shown are assumed to be the absolute
minimum space required to service a unit. It is suggested
that unit-to-wall clearance on all sides: this will allow easieraccess to all components for general unit servicing.
2. Room for general maintenance of fans and refrigerant
components was considered. Also the minimum roomrequired to remove fans, fan motors and compressor
servicing is considered. Cleaning of the condenserwaterside tubes must be accomplished by the use of a
chemical cleaning machine.
3. The clearance specified on the unit control panel side is the
clearance which is required for general unit servicing andnot that which is required by local electrical codes.
4. Refer to the dimension data for recommended clearance.
Change/Clean FiltersChange or clean air filters at least twice a year. Filters will berequired more frequent care under high load conditions or
dirty air. A clogged air filters reduces airflow, cooling capacity
and increases energy usage.
To clean permanent filters, remove the filter media and washit in water to remove dust, dirt and lint; allow to dry thoroughly
before re-installing in the units. Do not rub or wring.
Permanent filters can also be cleaned by blowing withcompressed air in opposite direction of filter airflow.
SRUB-IOM001-EN 23
Belt MaintenanceClean fan belts and pullies with a dry cloth. Oil and greasemust be kept off belts. The use of a belt dressing is not
recommended. When replacing belts, use a matched set. Donot force belts onto pullies, but adjust motor position to allow
mounting and then re-tighten.
Figure 7 : Belt Tension Measurement
Maintenance
To measure belt tension, use a belt tensioner as shown in
Figure 7. Determine actual deflection by depressing one beltwith the belt tensioner and then adjust the belt tension to the
correct pounds force and tighten all setscrews to the propertorques.
Fan Drive MaintenancePerform the following procedures at the intervalsrecommended
1. Rotate the fan wheel to be sure that it turn freely in theproper direction of rotation and is not rubbing on the fan
housing, inlet. If necessary, re-center the fan wheel.2. Check the position of both shafts. Fan and motor shafts
should operate parallel to each for maximum belt and
bearing life. Shim as necessary under the motor or fanbearing to obtain proper alignment.
3. Check the fan motor sheave alignment with a straightedgeor a tightly pulled string. For sheaves of different widths,
place a string in the center groove of each sheave and pullit tight for a center line. See Figure 8.
4. Once the sheaves are properly aligned, tighter sheave setscrews to proper torque.
5. Check belt tension. Refer to “Measuring Belt Tension”.
6. If required, adjust belt to the minimum recommendedtension. Refer to “Adjusting Belt Tension”.
7. Re-tighten bearing setscrews to the proper torques afteraligning the sheaves.
8. Check the fan bearing locking collars for tightness on theshaft. To tighten the locking collar, loosen the setscrew and
slide the collar into its proper position over the extendedend of the inner case.
9. During air balancing, be sure to check the shaft parallel,
sheave alignment and belt tension.
Spa
nForce
Deflection
WARNING : Disconnect electrical powersource to prevent injury or death from electrical shock.
Figure 8 : Fan Shaft and Motor Sheave Alignment
Fixed Sheave
Straight edge shouldtouch sheave at topand bottom.
Straight edge
Straight edge shouldtouch sheave at topand bottom.
Fixed Sheave
Straight edge
Fixed Sheave
Lines must be parallel.For uneven width sheaves,use a taut string down thecenter of both sheaves.
24 SRUB-IOM001-EN
Maintenance
Coil Fins and External Surface CleaningCoil should be kept clean to maintain maximum performance. For operation at itshighest efficiency, the refrigerant coil should be cleaned often during periods of high
cooling demand or when dirty conditions prevail. A routine cleaning schedule(minimum of once per year) is recommended to prevent dirt buildup in the coil fins,
where it may not be visible.
Remove large debris from the coils and straighten fins before cleaning. Remove
filters before cleaning.
Clean refrigerant coil with cold water and detergent, or with one of the commerciallyavailable chemical coil cleaners. Rinse coils thoroughly after cleaning.
SRUB-IOM001-EN 25
Note
26 SRUB-IOM001-EN
Note
Trane Thailand7th Floor, Ploenchit Center Building2 Sukhumvit Road, KlongtoeyBangkok 10110Amair Limited35 Mu 8, Poochaosamingprai RoadSamrong Tai, Samutprakarn 10130http://www.trane.comAn American Standard Company
Literature Order Number: SRUB-IOM001-EN
New
Stocking Location: Bangkok, Thailand
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Since The Trane Company has a policy of continuous product and product data improvement,it reserves the right to change design and specifications without notice.
