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4. Control Board Check Procedure ............................................................................ 26
5. Control Board Replacement ................................................................................ 27
D. Harvest Control - Thermistor ...................................................................................... 27
1. Thermistor Check Procedure .................................................................................. 27
E. Float Switch ................................................................................................................. 27
1. Float Switch Check Procedure ............................................................................... 27
2. Float Switch Cleaning ............................................................................................ 28
F. Bin Control ................................................................................................................... 29
III. Technical Information ...................................................................................................... 30
A. Water Circuit and Refrigeration Circuit ........................................................................ 30
1. KM-1900SAH, KM-1900SAH3 (air-cooled) ............................................................. 30
2. KM-1900SWH, KM-1900SWH3 (water-cooled) ..................................................... 31
3. KM-1900SRH, KM-1900SRH3 (remote air-cooled)................................................ 32
B. Wiring Diagrams .......................................................................................................... 33
1. KM-1900SAH (air-cooled) ...................................................................................... 33
2. KM-1900SAH3 (air-cooled) ................................................................................... 34
3. KM-1900SWH (water-cooled), KM-1900SRH (remote air-cooled) ........................ 35
4. KM-1900SWH3 (water-cooled), KM-1900SRH3 (remote air-cooled) .................... 36
C. Performance Data ....................................................................................................... 37
1. KM-1900SAH (air-cooled) ...................................................................................... 37
2. KM-1900SAH3 (air-cooled) .................................................................................... 38
3. KM-1900SWH (water-cooled) ............................................................................... 39
4. KM-1900SWH3 (water-cooled) ............................................................................. 40
5. KM-1900SRH (remote air-cooled) ......................................................................... 41
6. KM-1900SRH3 (remote air-cooled) ........................................................................ 42
IV. Service Diagnosis ........................................................................................................... 43
A. 10-Minute KM Diagnostic Procedure .......................................................................... 43
B. Diagnostic Charts ........................................................................................................ 45
1. No Ice Production ................................................................................................... 45
2. Evaporator is Frozen Up ........................................................................................ 48
3. Low Ice Production ................................................................................................ 50
4. Abnormal Ice ......................................................................................................... 51
5. Other ...................................................................................................................... 52
V. Removal and Replacement of Components .................................................................... 53
A. Service for Refrigerant Lines ....................................................................................... 53
1. Refrigerant Recovery ............................................................................................. 53
2. Brazing .................................................................................................................. 53
3. Evacuation and Recharge (R-404A) ...................................................................... 54
B. Removal and Replacement of Compressor ................................................................. 55
C. Removal and Replacement of Expansion Valve .......................................................... 56
D. Removal and Replacement of Hot Gas Valve or Liquid Line Valve ............................. 57
E. Removal and Replacement of Evaporator ................................................................... 58
F. Removal and Replacement of Condenser - Air-Cooled Models ................................... 58
G. Removal and Replacement of Condenser - Water-Cooled Models ............................. 59
H. Removal and Replacement of Condenser - Remote Air-Cooled Models ..................... 60
J. Adjustment of Water Regulating Valve - Water-Cooled Models ................................... 62
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