Avantco 178Z2FWMS Service Manual - Page 7

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Service Manual

P. 7

Part Testing

Max Load

Locked Rotor Amps

Model #

Amps

(LRA)

Compressor and Capacitor

178Z1RHC

3.6 Amps

22.4 Amps

With the unit 'ON' and the controller calling for

178Z2RHC

7.2 Amps

44.1 Amps

compressor to run then:

- Check for 120 volts at main compressor plug

between the red and white wires (Fig. 8)

- Check for amperage +/- 10% on the red wire.

If amperage is above running amps and below locked

rotor amps, replace starting components. Reference

table at right for amps.

If amperage is at Locked Rotor Amps, replace

compressor.

With the unit 'OFF' and disconnected from the power

supply, disconnect wiring from the compressor. Check

resistance from common to run and start windings.

Resistance should be found using the following

equation:

Fig. 8

(Run to Start = (Run to Common) + (Start to Common))

Temperature will change resistance OHM values.

Check windings are not connected to ground by

check OHMs from each pin to shell of the compressor

(paint must be removed from the case when checking

for grounding).

Capacitor checks:

Visually check for any deformations or leaking oil-like

fluids. Replace if any are found.

Discharge capacitor prior to testing. Use a 20,000

ohm, 2 watt resistor, caution resistor will be HOT

during discharge.

Replace if micro-farads are not with +/- 10%

Fig. 9

NOTE: It is recommended that if the

compressor fails to ensure that the condenser

fan is operating correctly.