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184617-02
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INSTALLATION AND SERVICE MANUAL 917N-CMT, 927CMT, 957CMT
PROBLEM
PROBABLE CAUSE
REMEDY
Troubleshooting Charts
Compressor/Condensing Circuits
12 Service Troubleshooting Charts
– continued
1.
Low line voltage.
2.
Excessive line voltage.
3.
Contactor chattering.
1.
Make sure your freezer is connected to
a SEPARATE circuit independent from
any other electrical equipment. Ask
power company to increase voltage to
not less than 10% below dataplate rating
or install transformer.
2.
Ask power company to reduce voltage
to maximum of 10% over dataplate
rating.
3.
Check movister, time delay and
thermostat. Replace as needed.
Contactor failure,
points burned
and pitted.
1.
Improperly wired.
2.
Low line voltage.
3.
Open start capacitor. (single phase only)
4.
High discharge pressure.
5.
Defective compressor.
6.
Potential relay defective.
Compressor will
not start - hums
intermittently
(cycling on
overload).
1.
Check wiring against diagram.
2.
Ask power company to increase voltage to
not less than 10% below dataplate rating or
install transformer. Check for inadequate
wire size and length of wire to circuit
breaker.
3.
Replace start capacitor.
4.
See "Discharge Pressure Too High" this
section.
5.
Replace compressor.
6.
Replace potential relay.
1.
Low line voltage.
2.
Improperly wired.
3.
Run capacitor shorted. (single phase only)
4.
Start capacitor weak. (single phase only)
5.
Defective relay. (single phase only)
Compressor
starts, but
remains in start
windings.
1.
Ask power company to increase voltage to
not less than 10% below dataplate rating or
install transformer. Check for inadequate
wire size and length of wire to circuit
breaker.
2.
Check wiring against diagram. Check wire
size.
3.
Check by disconnecting run capacitor.
4.
Check capacitor, replace.
5.
Replace relay.