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H.C Duke & Son 959R Operator’s Manual With Illustrated Parts List page 119

Twin twist soft serve freezer
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11
Service Troubleshooting charts
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PROBLEM
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Unit operates
1. Di
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long or
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continuously.
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2.
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1 2 3 4 5 6 7 8 9 0 1 2 3 4 5
1 2 3 4 5 6 7 8 9 0 1 2 3 4 5
1 2 3 4 5 6 7 8 9 0 1 2 3 4 5
1 2 3 4 5 6 7 8 9 0 1 2 3 4 5
1 2 3 4 5 6 7 8 9 0 1 2 3 4 5
1 2 3 4 5 6 7 8 9 0 1 2 3 4 5
1 2 3 4 5 6 7 8 9 0 1 2 3 4 5
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3.
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1 2 3 4 5 6 7 8 9 0 1 2 3 4 5
1 2 3 4 5 6 7 8 9 0 1 2 3 4 5
1 2 3 4 5 6 7 8 9 0 1 2 3 4 5
1 2 3 4 5 6 7 8 9 0 1 2 3 4 5
1 2 3 4 5 6 7 8 9 0 1 2 3 4 5
1 2 3 4 5 6 7 8 9 0 1 2 3 4 5
1 2 3 4 5 6 7 8 9 0 1 2 3 4 5
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4.
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CAUTION: When evacuating either side of a double freezer DO NOT OPERATE THE
1 2 3 4 5 6 7 8 9 0 1 2 3 4 5
1 2 3 4 5 6 7 8 9 0 1 2 3 4 5
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OPPOSITE SIDE. All control switches must be in the "OFF" position and the main power supply
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disconnected. If power is applied to a compressor in a vacuum a short may occur. CAUSING
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PERSONAL INJURY.
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1 2 3 4 5 6 7 8 9 0 1 2 3 4 5
5.
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1 2 3 4 5 6 7 8 9 0 1 2 3 4 5
1 2 3 4 5 6 7 8 9 0 1 2 3 4 5
1 2 3 4 5 6 7 8 9 0 1 2 3 4 5
1 2 3 4 5 6 7 8 9 0 1 2 3 4 5
1 2 3 4 5 6 7 8 9 0 1 2 3 4 5
1 2 3 4 5 6 7 8 9 0 1 2 3 4 5
1 2 3 4 5 6 7 8 9 0 1 2 3 4 5
1 2 3 4 5 6 7 8 9 0 1 2 3 4 5
1 2 3 4 5 6 7 8 9 0 1 2 3 4 5
1 2 3 4 5 6 7 8 9 0 1 2 3 4 5
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Discharge
1.
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pressure too
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high.
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2.
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3.
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4.
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1 2 3 4 5 6 7 8 9 0 1 2 3 4 5
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5.
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6.
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1 2 3 4 5 6 7 8 9 0 1 2 3 4 5
1 2 3 4 5 6 7 8 9 0 1 2 3 4 5
1 2 3 4 5 6 7 8 9 0 1 2 3 4 5
CAUTION: When evacuating either side of a double freezer DO NOT OPERATE THE
1 2 3 4 5 6 7 8 9 0 1 2 3 4 5
1 2 3 4 5 6 7 8 9 0 1 2 3 4 5
1 2 3 4 5 6 7 8 9 0 1 2 3 4 5
OPPOSITE SIDE. All control switches must be in the "OFF" position and the main power supply
1 2 3 4 5 6 7 8 9 0 1 2 3 4 5
1 2 3 4 5 6 7 8 9 0 1 2 3 4 5
1 2 3 4 5 6 7 8 9 0 1 2 3 4 5
disconnected. If power is applied to a compressor in a vacuum a short may occur. CAUSING
1 2 3 4 5 6 7 8 9 0 1 2 3 4 5
1 2 3 4 5 6 7 8 9 0 1 2 3 4 5
1 2 3 4 5 6 7 8 9 0 1 2 3 4 5
PERSONAL INJURY.
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1 2 3 4 5 6 7 8 9 0 1 2 3 4 5
1 2 3 4 5 6 7 8 9 0 1 2 3 4 5
1 2 3 4 5 6 7 8 9 0 1 2 3 4 5
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7.
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1 2 3 4 5 6 7 8 9 0 1 2 3 4 5
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1 2 3 4 5 6 7 8 9 0 1 2 3 4 5
1 2 3 4 5 6 7 8 9 0 1 2 3 4 5
1 2 3 4 5 6 7 8 9 0 1 2 3 4 5
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1 2 3 4 5 6 7 8 9 0 1 2 3 4 5
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8.
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1 2 3 4 5 6 7 8 9 0 1 2 3 4 5
1 2 3 4 5 6 7 8 9 0 1 2 3 4 5
1 2 3 4 5 6 7 8 9 0 1 2 3 4 5
1 2 3 4 5 6 7 8 9 0 1 2 3 4 5
1 2 3 4 5 6 7 8 9 0 1 2 3 4 5
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184981-02
Troubleshooting Charts
Compressor/Condensing Circuits
PROBABLE CAUSE
rty condenser.
(Air Cooled Remote Only)
Shortage of refrigerant.
Moisture in the system.
Glycol system problem.
Compressor failing.
Water turned off or defective water
regulating valve.
Restricted water cooled condenser.
Dirty condenser.
Unit location too warm.
Hooked to hot water line.
Glycol system problem.
Refrigerant overcharge.
Air in system.
INSTALLATION AND SERVICE MANUAL 959R
1.
Clean condenser.
2.
Remove charge into a refrigerant
recovery/recycling unit, repair leak,
evacuate and recharge system.
3.
Remove charge into a refrigerant
recovery/recycling unit, evacuate and
recharge system.
4.
Check glycol system.
5.
Check compressor for proper
pressures. Replace if inadequate. Pump
down to at least 10 inches vacuum and
should hold vacuum for 5 minutes.
1.
Turn on water, replace regulating valve, or
install water valve kit.
2.
Clean or replace condenser.
3.
Clean condenser.
4.
Relocate unit away from restriction. Place
nothing against the back of the unit.
5.
Connect to cold water line.
6.
Check glycol system.
7.
Bleed refrigerant charge into a refrigerant
recovery/recycling unit, until sight glass
bubbles (Flashes) then add refrigerant
until sight glass clears.
8.
Purge system into a refrigerant
recovery/recycling unit, evacuate and
recharge.
– continued
REMEDY
41

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