Trane SRUB Owner's manual

Installation
Operation
Maintenance
Air-Cooled Self Contained
Air Conditioner 7.5-20 Tons
SRUB Model 50Hz
Jan 2002 SRUB-IOM001-EN
Single Compressor Dual Compressors
SRUB 080 SRUB 160
SRUB 110 SRUB 190
SRUB 130 SRUB 220
SRUB 250

2SRUB-IOM001-EN
Model Nomenclature
Air-Cooled Self-Contained
Model 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

4SRUB-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
MOTORType
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
WeightApprox. ( 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
RETURN AIR
UNIT LOCATED REMOTE
RETURN AIR
ROOM SERIES AS
RETURN AIR PLENUM
FRESH AIR IN
CONDENSER AIR OU
T
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
RETURN 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
SUPPLY AIR
SUPPLY AIR
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
RETURN AIR
SUPPLY AIR
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
SUPPLY AIR
RETURN 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 OU
T
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

6SRUB-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 13/16
4 1/8
Ø 3/4 KNOCKOUT
FOR CONTROL WIRING
(BOTH ENDS)
Ø 1 1/4 KNOCKOUT
FOR 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
13/16
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 13/16
4 1/8
Ø 3/4 KNOCKOUT
FOR CONTROL WIRING
(BOTH ENDS)
Ø 1 1/4 KNOCKOUT
FOR 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
13/16
L
C B

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
JI
H
4 1/8
5
7 13/16
10 5/16
12 13/16
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 BUTTON
13/16
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 DRAIN
CONN. (THIS END)
11/2
57 13/16
10 5/16
12 13/16
4 1/8
Ø 3/4 KNOCKOUT
FOR CONTROL WIRING
(BOTH ENDS)
Ø 1 1/4 KNOCKOUT
FOR UNIT POWER
(BOTH ENDS)
1/2
PILOT RED LAMP
START BUTTON
STOP BUTTON
13/16
L
M
C B

8SRUB-IOM001-EN
General Information
Foreword
These instructions do not attempt to cover all variations in
systems, nor to provide for every possible contingency to be
met in connection with installation. Should further information
be desired or should particular problems arise which are not
sufficiently covered for the purchaser’s purpose, the matter
should be referred to the manufacturer.
Reception
On arrival, inspect the unit before signing the delivery note.
Specify any damage on the delivery note, and send
aregistered letterofprotestto thelastcarrierof thegoodswithin
72 hours of delivery. Notify the local Trane Sales Office at the
sametime.The unit shouldbe totallyinspected within 15days
of delivery. If any concealed damage is discovered, stop
unpacking the shipment. Take photos of the damage material,
if possible. Notify the carrier immediately by phone and
registeredmail. Notifythe localTraneSalesOffice.Concealed
damage 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 Information
This 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 SRUB
250 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 the
vertical or horizontal discharge with the vertical standard.
Note : “Warnings” and “Cautions” appear at appropriate
places in this manual. Your personal safety and the proper
operation 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 Emissions
World environmental scientists have concluded, based on
the best currently available evidence, that ozone in our
upperatmosphereis beingreduced due torelease ofCFC
fully halogenated compounds.
The Trane Company urges all HVAC servicers working on
Trane equipment, or any manufacturer’s products, make
everyeffortto eliminate, ifpossible, or vigorously reduce
the 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 refrigerants
for continued use even when acceptable alternatives are
available.
Unit Inspection
Inspect material carefully for any shipping damage. If
damaged,it must bereported to,and claimsmade againstthe
transportationcompany.Compare theinformationthat appears
on the unit nameplate with ordering and submittal data to
insure the proper unit was shipped. Available power supply
must be compatible with electrical characteristics specified on
component nameplates. Replace damaged parts with
authorized parts only.
WARNING : Open and lock unit disconnect to
prevent injury or death from electric shock or contact
with moving parts before attempting any installation
or maintenance.

SRUB-IOM001-EN 9
A
B
C
Installation
Lifting Recommendations
Before preparing the unit for lifting, estimate the approximate
center of gravity for lifting safety. Because of placement of
internal components, the unit weight may be unevenly
distributed.
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 personal
injury 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 slings
securely to the lifting holes at each corner. Use spreader bars
to protect the unit casing from damage. Test lift the unit to
determine proper balance and stability.
Caution : Use spreader bars to prevent lifting straps from
damaging the unit. Install bars between lifting straps. This will
prevent the straps from crushing the unit cabinet or damaging
the unit finish.
Figure 1: Space Requirement for SRUB Model
Table 1: Show Space Requirement for SRUB Model
Inspection Checklist
To 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 accepting
the 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 is
discovered, stop unpacking the shipment. Do not remove
damaged material from the receiving location. Take
photos of the damage if possible. The owner must provide
reasonable evidence that the damage did not occur after
delivery.
Notify the carrier’s terminal of damage immediately by
phone 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
Model Weight
kg (lb)
Installation Considerations
1. 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 1
3. Availablepower supplymust agreewith electricaldata oncomponent nameplate.
4. If external accessories are installed on the unit, additional clearance must be
provided.
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 accomplished
before the unit is started. This checklist does not replace the
detailed instruction given in appropriate sections or this
manual. 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 inside
the 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 and
consider 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 power
source 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 is
not subjected to drafts of “dead” spots behind doors or in
comers; hot to cold air from duct; radiant heat from the sun
or 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 Charging
and Evacuation
Caution
Refrigerant “R22” only.
Always evacuate air from the tubing before adding
refrigerant.
Addrefrigerant throughthe chargingport ofliquid linevalve
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 quality
is equivalent to that of a new refrigerant. For this, it is
necessary to have a precise analysis made by a
specialized laboratory. If this condition is not respected, the
manufacturer’s warranty could be cancelled.
Gaseous Charging
This procedure is accomplished with the unit operating.
Electricalconnections mustbe complete.Do notproceed until
the system is ready to operate.
Procedure
1. 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 to
ten minutes to stabilize operating conditions.
3. Measure airflow across the evaporator coil. Compare the
measurements with the fan performance data in the Data/
Submittal or Service Facts. Once proper airflow is
established,observe thesuctionand headpressuregauges
on the gauge manifold. Pressure reading should fall
approximately at the points shown by the pressure curves
in Service Facts. Add or remove refrigerant (gas only) as
requiredto obtaincorrecthead andsuctionpressure. Check
suction 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 pivotal
cover before attempting to replace access panel.
6. Replace all the panels.

SRUB-IOM001-EN 13
Refrigerant Charging
The initial volume of refrigerant should be charged into the
high side of the system, in liquid form, through the liquid line
charging valve. The following procedure is suitable for most
systems.
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 refrigerant
cylinderand allowenoughrefrigerant gastoescape through
the loose connection to purge air from the connection to
purge 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 the
system.
4.Continue charginguntil theestimatedrefrigerant chargehas
entered the system. At this point, close the liquid line
charging 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 air
temperature. If the system need more refrigerant, charging
it to suction line charging valve.
7. It is good practice to leave the refrigerant drum connected
to the charging valve until the system has completed its 24
hour test run. This permits the addition or removal of
refrigerant,as necessarytoestablish propersystemcharge.
Model Total 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
Manifold
Gauges
Liquid Line
Gauge Port
Liquid Line
Service Valve
Suction Line Gauge Port
Suction Line Service Valve
Table 3: Refrigerant Charging for 50 Hz
Domestic SRUB Model
Refrigerant Charging
and 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 Compressors
Because Trane scroll compressors are uniquely different
from traditional reciprocating compressors, their operating
characteristics and requirements represent a departure from
reciprocating compressor technology.
WARNING : Avoid contact with the top of the
scroll compressor. It becomes hot during normal operation.
Compressor Electrical Phasing
Proper 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 by
confirming that the electrical phase sequence of the power
supply is correct. The motor is internally connected for
clockwise 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 three
voltages of a three-phase system succeed one another is
called phase sequence or phase rotation. This is determined
by 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 by
interchanging any two of the line wires. It is this possible
interchange of wiring that makes a phase sequence indicator
necessary if the operator is to quickly determine the phase
rotation of the motor.
Correcting Improper Electrical Phase Sequence
Proper compressor motor electrical phasing can be quickly
determinedandcorrected beforestartingthe unit.Usea quality
instrument such as anAssociated Research Model 45 Phase
Sequence Indicator and follow this procedure.
1. Open the electrical disconnect or circuit protection switch
that provides line power to the line power terminal block in
the control panel (or to the unit-mounted disconnect).
2. Connect the phase sequence indicator leads to the 1TB as
follows:
Phase seq. Lead 1TB Terminal
Yellow (Phase A).............L1
Blue (Phase B).............L2
Black (Phase C).............L3
Refer to Figure 6
3. Read the phase sequence on the indicator after turning
poweron by closingthe unitsupply powerfused disconnect.
The “ABC” Indicator on the face of the phase indicator will
glow if phase is ABC.
WARNING : To prevent injury or death due to
electrocution, take extreme care when performing service
procedures with electrical power energized.
Figure 4
Connect
To Contractor
Internal Motor
Wiring Diagram
External Motor
Wiring 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 switch
two 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.
❑Compressorcannot compressthe refrigerant(Pressure will
not increase at high pressure side.)
❑Compressor will operate loudly.
❑The current (Amps) will be lower. Switch two line leads on
1TB and check again. If the diagnosis still persists, please
contact Trane sales office.
Figure 5 :
Associated Research Model 45
Phase Sequence Indicator
Figure 6 :
Terminal Block 1TB
Phase Sequencing
CUSTOMER POWER
WIRE ENTRY
SRUB Control Panel
LINE VOLTAGE
L1
PHASEA
L2
PHASE B L3
PHASE C
T1
PHASEA
T2
PHASE B T3
PHASE C
1TB
Black
Red
Yellow

20 SRUB-IOM001-EN
Electrical Information
Unit Voltage
Electrical power to the unit must meet stringent requirements
forthe unittooperate properly.Total voltagesupplyand voltage
imbalance between phases should be within the following
tolerances.
Voltage Supply
Measure each leg of supply voltage at all line voltage
disconnect switches. Readings must fall within the voltage
utilization range shown on the unit nameplate. If voltage on
any leg does not fall within tolerance, notify the power
company to correct this situation before operating the unit.
Inadequate voltage to the unit will cause control components
to malfunction and shorten the life of electrical components
and compressor motors.
Voltage Imbalance
Excessivevoltageimbalancebetweenphasesin athree-phase
system will cause motors to overheat and eventually fail.
Maximumallowableimbalance is2 percent.Voltageimbalance
is 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 fused
disconnect 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 +384
3
= 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. This
much imbalance between phases can equal as much as 20
percent current imbalance with a resulting increase in winding
temperature that will decrease compressor motor life.