Voltage Supply And Voltage Imbalance - Trane IntelliPak SAHL Series Installation, Operation And Maintenance Manual

Unit Start Up
The compressor motor is internally connected for clockwise rotation with the incoming power
supply phased as A, B, C.
Proper electrical supply phasing can be quickly determined and corrected before starting the unit
by using an instrument such as an Associated Research Model 45 Phase Sequence Indicator and
following the steps below:
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.
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Table 34.
Phase sequence leads
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.
•
HIGH VOLTAGE IS PRESENT AT TERMINAL BLOCK 1TB1 OR UNIT DISCONNECT
SWITCH 1S14.
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Voltage Supply and Voltage Imbalance

Voltage Supply
Electrical power to the unit must meet stringent requirements for the unit to operate properly.
Measure each leg (phase-to-phase) of the power supply. Each reading must fall within the
utilization range stamped on the unit nameplate. If any of the readings do not fall within the proper
tolerances, notify the power company to correct this situation before operating the unit.
106
Turn the field supplied disconnect switch that provides power to terminal block 1TB1 or to the
unit mounted disconnect switch 1S14 to the "Off" position.
Connect the phase sequence indicator leads to the terminal block or unit mounted disconnect
switch as follows;
Black (Phase A)
Red (Phase B)
Yellow (Phase C)
Close the disconnect switch or circuit protector switch that provides the supply power to the
unit's terminal block 1TB1 or the unit mounted disconnect switch 1S14.
Observe the ABC and CBA phase indicator lights on the face of the sequencer. The ABC
indicator light will glow if the phase is ABC. If the CBA indicator light glows, open the disconnect
switch or circuit protection switch and reverse any two power wires.
Restore the main electrical power and recheck the phasing. If the phasing is correct, open the
disconnect switch or circuit protection switch and remove the phase sequence indicator.
WARNING
Unit power terminal
L1
L2
L3
WARNING
RT-SVX36G-EN