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TM077: 325 & 410 Series II Heat Pump Service Instructions
Rev 00: Issued April 2014
Component Tests 14
– 17
Test 14
Test 15
Unplug the circulator from the controller
and using a multimeter set on the
resistance (ohms) scale, measure between
the active (brown) and neutral (blue) pins
of the circulator plug.
Normal resistance is 602
Ω.
Unplug the HP switch from the controller
and using a multimeter set on the
resistance (ohms) scale, measure between
the pins of the HP switch plug.
Normal resistance when the HP switch is
closed is 0
– 1Ω.
Test 16
Test 17
Remove the compressor terminal cover
and using a multimeter set on the AC
voltage scale, measure between the red
and blue wires.
Normal voltage is 240V AC.
Using a multimeter set on the AC voltage
scale, measure between the active (red)
and neutral (blue) terminals of the
compressor plug at the controller.
Normal voltage is 240V AC.
602
0
240
