Troubleshooting
12
Voltage Check for 240V (4-Wire) Incoming Power
240VAC (Range of acceptability: 216VAC to 264VAC) should be read
between Line-2 and Line-1. 120VAC (Range of acceptability: 108VAC to
132VAC) should be read between Neutral and Line-1.
If ANY of the voltages read when checking the incoming power do not fall
within the indicated ranges of acceptability, then do not proceed with any
further troubleshooting until the incoming power issue is corrected.
Further Troubleshooting
If the system passes the incoming voltage check, the transformer and the
circuit boards’s glass fuse should be tested next. By testing the incoming
voltage, and the power to the board (the transformer, and glass fuse),
you can proceed with further troubleshooting without possibly missing an
underlying power related problem.
The Troubleshooting Test Points outlined on the next page will be
referenced throughout the rest of this section in explaining how to test the
various internal circuits of the control box. The page after next will explain
how to properly test the transformer and circuit board’s glass fuse. The
pages that follow that will explaining trouble shooting the other various
circuits of the control box.
NEUTRAL
LINE-2
LINE-1
Neutral and Line-1
120VAC (108VAC-132VAC)
NEUTRAL
LINE-2
LINE-1
Line-2 and Line-1
240VAC (216VAC-264VAC)
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