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INSTALLATION AND SERVICE MANUAL 959R
NOTE: Contact H.C. Duke & Son, Inc. for instructions prior to warranty
compressor replacement.
PROBLEM
PROBABLE CAUSE
REMEDY
Troubleshooting Charts
Compressor/Condensing Circuits
Keep your freezer in excellent condition. Always contact
H.C. Duke & Son, Inc. for replacement parts and
maintenance information.
QUALITY PARTS
PROTECT
YOUR
EQUIPMENT
11 Service Troubleshooting Charts
– continued
1. Low line voltage.
1. Ask power company to increase voltage to
not less than 10% below data plate rating
or install transformer.
Capacitor
failures. (Single
phase only)
2. Improper capacitor.
2. Replace capacitor with properly rated
capacitor.
1. Water regulating valve open too wide.
(Water cooled models only)
1. Adjust for proper water temperature and
discharge pressure or replace or repair
water valve.
Discharge
pressure too low.
2. Shortage of refrigerant.
2. Remove charge into a refrigerant
recovery/recycle unit, repair leak, evacuate
and recharge system.
1. Tubing rattle.
1. Bend tubes away from contact.
2. Spring broke internally.
2. Replace compressor.
Noisy
compressor
3. Bypassing on internal bypass.
3. Check head pressure. Adjust water
valve/clean condenser.