
P118F Service Manual
TABLE OF CONTENTS
1/6/09
iii
Page No.
High Head Pressure (Water Cooled)..............................................................................................................................8-9
High Head Pressure (Air-Cooled)..................................................................................................................................8-10
9. SERVICE OPERATIONS
Adjustable Blowdown (For Clearer Ice)........................................................................................................................9-1
Automatic Blowdown (Harvest Cycle)..........................................................................................................................9-1
Float Valve (Make-Up Water).......................................................................................................................................9-1
Float Switch...................................................................................................................................................................9-2
Hand Expansion Valve..................................................................................................................................................9-2
Capillary By-pass ..........................................................................................................................................................9-2
Freezer Pressure Switch.................................................................................................................................................9-3
Freezer Pressure Switch (Allen-Bradley), FIGURE 9-1................................................................................................9-3
Allen-Bradley Switch ....................................................................................................................................................9-3
High/Low Pressure Switch ............................................................................................................................................9-4
High/Low Pressure Switch, FIGURE 9-2......................................................................................................................9-4
Head Pressure................................................................................................................................................................9-5
Water Cooled Units .......................................................................................................................................................9-5
Air-Cooled Units ...........................................................................................................................................................9-5
Water Regulating Valve, FIGURE 9-3A.......................................................................................................................9-5
Condenser Fan Switch, FIGURE 9-3B..........................................................................................................................9-5
Compressor Crankcase Heater.......................................................................................................................................9-5
Compressor Motor Protection .......................................................................................................................................9-6
High Potential Testing..............................................................................................................................................9-7
Field Troubleshooting ..............................................................................................................................................9-7, 9-8
Electrical Installation Diagram, FIGURE 9-4 ..........................................................................................................9-8
Oil Pressure Safety Control ...........................................................................................................................................9-9
Oil Pressure Sensor ..................................................................................................................................................9-9
Oil Pressure Module.................................................................................................................................................9-9
Thawing Timer, FIGURE 9-5........................................................................................................................................9-10
Thawing Timer..............................................................................................................................................................9-10
Control Circuit Protection..............................................................................................................................................9-10
Condenser Cleaning.......................................................................................................................................................9-10
Air-Cooled Condenser...................................................................................................................................................9-10
Cutter Gear Reducer......................................................................................................................................................9-10
Pump Down...................................................................................................................................................................9-11
Removal Of Refrigerant From Machine........................................................................................................................9-11
Refrigerant Leaks ..........................................................................................................................................................9-12
Non-Condensable Gases................................................................................................................................................9-12
Compressor Motor Burnout...........................................................................................................................................9-12
Solenoid Valve ..............................................................................................................................................................9-13
Solenoid Valve ( “D” Valve), FIGURE 9-6 ..................................................................................................................9-13