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Section C - Electrical Components
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With an open relay, the compressor will not start since there is little or no
current to the start windings. The overload protector will open due to high
locked rotor run winding current.
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With a shorted relay or capacitor, the compressor will start, and the overload
protector will open.
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With an open or weak capacitor, the compressor will start and run. The
compressor, however, will be operating at reduced efficiency of energy
usage.
Compressor Electrical Check
If the compressor will not run, make a voltage check across the power lead
terminals on the PTC Relay. (See Figure C4.)
The voltmeter should show line voltage if the thermostat knob is in normal
operating position and not in the OFF position. If this check does not show a live
circuit, the electronic control system wiring should be checked for loose and/or
broken connections.
You can jump from J42 to J41 with a piece of wire as a temporary bridge. If the
compressor starts and runs with the bridge, the control thermostat is at fault and
should be replaced.
If the voltage check shows power supply at the PTC Relay terminals, use a test
cord to check the compressor.
If the compressor does not start and run with the test cord, check the line voltage
to see if it is 115 volts ± 10% (104 - 126). If voltage is correct and the compressor
will not start and run, replace the compressor.
If the compressor starts and runs with the test cord, replace the PTC Relay.
PERIMETER AND MULLION HOT TUBE
To reduce the possibility of condensation forming on the exterior of the cabinet in
high humidity areas, units are equipped with a one piece perimeter and mullion hot
tube which is part of the refrigeration system. No electric heaters are used. Refer
to the Refrigeration System Section for more information.
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