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2800 Series
CN103
CN104
CN102
Fuse
CN8
CN101
RY101
RY103
RY102
Power Supply Board
The power supply board contains all of the circuits
and logic which control the relays for the heater,
compressor, and fan motors. The only component
on the board that is replaceable is the fuse. None
of the relays and other electronic components
mounted on the circuit board are replaceable in the
fi eld. If a component on the board (except for the
fuse) malfunctions, the board must be replaced as a
complete assembly.
Check for 12 VAC on the power supply board at
CN103 between pin 1 and pin 2.
If the 3-amp fuse has failed, check the fan motors
for a problem.
CN101
- Indoor Fan
CN102
- Outdoor Fan
CN103
- Transformer*
CN104
- Control Board
RY101
- Compressor
RY102
- Heater L1
RY103
- Heater L2
RY109
- Supplemental 1K Heater
CN8
- Open Connector/Line Test Point
Note:
The connector at CN104 is permanently
attached to the power supply board.
3800 Series
Non-Corrosive Model Shown (AC Fan Motor)
RY102
Fuse
CN8
RY101
CN102
CN104
CN101
CN103*
RY103
RY109
*Black = in-line input; Yellow wires = 12 VAC transformer input
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