H.C Duke & Son 959R, Operator’S Manual With Illustrated Parts List

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INSTALLATION AND SERVICE MANUAL 959R
PROBLEM PROBABLE CAUSE REMEDY
11 Service Troubleshooting Charts
– continued
1. F reezer unplugged. 1. P lug in freezer.
2. Fuse or breaker blown at main
disconnect.
2. Make sure your freezer is connected to a
separate circuit independent from any other
electrical equipment. Have technician
check fuse or breaker size and check for
low voltage; if not within 10% of nameplate
rating call power company. Double head
freezers with 2 compressors must have
independent circuits.
3. Beater motor out on overload. 3. Press overload reset button. Check for low
voltage. Check product temperature.
4. Off on high pressure cut-out control. 4. Check refrigerant charge, pressure settings
and high pressure control. Check for
restricted water or drain line. Check
condenser fans. Clean condenser.
5. Off on low pressure cut-out control. 5. Check refrigerant charge, pressure settings
and low pressure control. Check for
moisture in refrigeration system.
6. Faulty selector switch. 6. Replace selector switch.
Unit does not
operate.
7. Disconnected or broken wire in electrical
circuit.
7. Check wiring and connections; repair or
replace lead wires as necessary.
1. Faulty o-ring. 1. Replace o-ring. Mix leaking at
dispensing
head.
2. Head not properly installed. 2. Install head properly. Replace o-ring if
pinched.
1. Automatic expansion valve incorrectly
set or erratic in operation.
1. Adjust or replace expansion valve.
2. Leak in refrigeration system resulting in
little or no refrigeration.
2. Find refrigeration leak. Remove charge
into a refrigeration recovery/recycling unit.
Repair leak, evacuate and recharge
system.
Dispensed
product too soft.
(Product
temperature
above 19°F)
3. Thermostat set too high or faulty. 3. Adjust thermostat or replace.
1. Damaged beater shaft seal or installed
improperly.
1. Replace shaft seal or o-ring inside washer.
Install properly.
2. Beater shaft pitted or damaged where
o-ring rides.
2. Replace beater shaft.
Leakage of mix
or water from
drain tube to drip
tray.
3. Beater shaft end play not set properly. 3. See Section 9.4.3 Installation & Service
Manual.