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INSTALLATION AND SERVICE MANUAL 959R
PROBLEM
PROBABLE CAUSE
REMEDY
Troubleshooting Charts
Compressor/Condensing Circuits
11 Service Troubleshooting Charts
– continued
1.
Low line voltage.
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 data plate rating or install
transformer. Double head freezers with 2
compressors must have independent
circuits.
Contactor
failure, points
burned and
pitted.
2.
Excessive line voltage.
2. Ask power company to reduce voltage to
maximum of 10% over data plate rating.
1. Low line voltage.
1. Check voltage, check for other equipment
on the same circuit.
2. Improperly wired.
2. Check wiring against drawing. Check wire
size.
3. Start relay defective.
3. Replace start relay.
4. Starting capacitor weak or defective.
4. Check capacitor, replace if necessary.
Compressor
starts, but
remains in start
windings (single
phase only)
5. High discharge pressure.
5. Check air condenser and clean if
necessary. Check water flow if water
cooled.
1.
Improperly wired.
1. Check wiring against diagram.
2.
Low line voltage.
2. Check voltage. Check for other equipment
on the same circuit.
3.
Open starting capacitor.
(single phase only)
3. Replace starting capacitor.
4.
High discharge pressure.
4. Check air condenser and clean if
necessary. Allow for proper air flow.
5. De fective compressor.
5. Replace compressor.
6.
Start relay defective.
6. Replace start relay.
Compressor
does not start –
hums
intermittently
(cycling on
overload).
7.
Water line restriction.
7. Clear restricted water line