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.
❑ 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 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
PHASE A
L2
PHASE B
L3
PHASE C
T1
PHASE A
T2
PHASE B
T3
PHASE C
1TB
Black
Red
Yellow
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