Compressor Motor Phase Sequencing - Trane R Series Installation Operation & Maintenance

Installation Electrical
Figure 18 Electrical Installation
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.

Compressor Motor Phase Sequencing

Always verify that proper rotation of the Series R compressor is established
before the machine is started. Proper motor rotation requires confirmation of
the electrical phase sequence of the power supply. The motor is internally
connected for clockwise rotation with incoming power supply phased A, B, C.
To confirm the correct phase sequence (ABC), use a Model 45 Associated
Research Phase indicator or equivalent.
Basically, 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
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