Thermo IEC Micromax 3590, Service Manual, Page: 46 / 84

12.2 Condensing Unit
Service of the condensing unit should be performed by
qualified personnel only, with the proper refrigerant
recovery systems.
The condensing unit consists of the compressor, the
condenser fan and their related electrical components.
Test
Use the following procedure, to verify voltage to the
compressor:
WARNING: This procedure requires operation of the unit with
power applied and the cabinet removed. Use caution
to avoid electric shock. See Section 7.1, Warnings and
Cautions.
1. Unplug the unit.
2.
3.
4.
Remove lid and place the cabinet on its side, leaving
the control panel plugged in.
Plug in the unit.
Close the latch.
5. Set temperature below ambient. The compressor
should turn on within one minute. Use a voltmeter to
measure the AC voltage at the electrical box across the
BLU and BLK wires which go directly into the
compressor.
6. The voltage applied to the compressor should be
approximately 120 volts AC (or the actual in-line
voltage).
7. If voltage is present, but the compressor does not start,
check the starting capacitor.
8. If voltage is not present and the COMP LED on the
Power PC board is lit, check the solid state relay (see
Section 12.3).
To verify voltage to the condenser fan:
WARNING: This procedure requires operation of the unit with
power applied and the cabinet removed. Use caution
to avoid electric shock. See Section 7.1, Warnings and
Cautions.
1. Remove the refrigeration cabinet.
2. Measure across the two leads to the fan (WHT &
ORG).
3. When cooling is called for, this should read
approximately 120 VAC.
Micromax Series
44
Service Manual