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P24A & P34A Service Manual
iv
TABLE OF CONTENTS
Page No.
9. SERVICE OPERATIONS
Automatic Blowdown (Harvest Cycle)..........................................................................................................................9-1
Cleaning the Ice Making Section ...................................................................................................................................9-1
Float Valve (Make-Up Water) .......................................................................................................................................9-1
Float Switch...................................................................................................................................................................9-1
Hand Expansion Valve ..................................................................................................................................................9-2
Freeze Timer..................................................................................................................................................................9-2
Freezer Pressure Switch, FIGURE 9-1 ..........................................................................................................................9-2
High/Low Pressure Switch ............................................................................................................................................9-2
High/Low Pressure Switch, FIGURE 9-2......................................................................................................................9-3
Fan Control (Cooling Tower) ........................................................................................................................................9-3
Fan Control Switch, FIGURE 9-3 .................................................................................................................................9-3
Compressor Crankcase Heater .......................................................................................................................................9-4
Oil Pressure Switch........................................................................................................................................................9-4
Oil Pressure Switch, FIGURE 9-4 .................................................................................................................................9-4
Control Circuit Protection..............................................................................................................................................9-4
Thawing Timer ..............................................................................................................................................................9-5
Thawing Timer, FIGURE 9-5........................................................................................................................................9-5
Condenser Cleaning......................................................................................................................................................9-6
Cutter Gear Reducer ......................................................................................................................................................9-6
Drive Gear Replacement................................................................................................................................................9-7
Gear Reducer Replacement ...........................................................................................................................................9-8
Water Tank and Cutter Parts Weights, TABLE 9-1.......................................................................................................9-9
Water Tank Removal .....................................................................................................................................................9-9
Cutter Assembly Removal and Installation....................................................................................................................9-10
Bearing Bracket and Cutter Disc Removal ....................................................................................................................9-10
Cutter Shaft and Bearing Removal ................................................................................................................................9-10
Cutter Shaft and Bearing Installation.............................................................................................................................9-11
Cutter Height Adjustment..............................................................................................................................................9-12
Water Tank Installation .................................................................................................................................................9-12
P24A Cutter Assembly, FIGURE 9-5A.........................................................................................................................9-12
P24A Water Tank Assembly, FIGURE 9-5B ................................................................................................................9-13
P24A and P34A Cutter and Water Tank Part No., TABLE 9-2.....................................................................................9-14
Cutter Ring Gear Replacement ......................................................................................................................................9-15
Cutter Blade Replacement .............................................................................................................................................9-15
Cutter Blade and Adapter Plate Adjustment, FIGURE 9-6............................................................................................9-16
Cutter Adapter Plate Installation....................................................................................................................................9-16
Pumpdown .....................................................................................................................................................................9-17
Removal of Ammonia Refrigerant from the Machine ...................................................................................................9-17
12/20/12
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