4
D. Bin Control .................................................................................................................. 24
E. Float Switch ................................................................................................................. 24
F. Thermistor .................................................................................................................... 24
G. Switches ..................................................................................................................... 25
1. Control Switch ........................................................................................................ 25
2. Service Switch ....................................................................................................... 25
a) DRAIN .............................................................................................................. 25
b) CIRCULATE ..................................................................................................... 25
c) WASH ............................................................................................................... 25
III. Technical Information ...................................................................................................... 26
A. Water Circuit and Refrigeration Circuit ........................................................................ 26
1. KMD-450MAH (air-cooled) ..................................................................................... 26
2. KMD-450MWH (water-cooled) ............................................................................... 27
B. Wiring Diagram and Multimeter Access Points ................................................................28
1. Wiring Diagram ....................................................................................................... 28
2. Multimeter Access Points ....................................................................................... 29
a) Diagnostic Connector ....................................................................................... 29
b) Compressor Terminal Block ............................................................................. 29
C. Performance Data ....................................................................................................... 30
1. KMD-450MAH (air-cooled) ..................................................................................... 30
2. KMD-450MWH (water-cooled) ............................................................................... 31
IV. Service Diagnosis ........................................................................................................... 32
A. Diagnostic Procedure ................................................................................................. 32
B. Control Board Check ................................................................................................... 36
C. Bin Control Check and Cleaning ................................................................................. 37
1. Bin Control Check .................................................................................................. 37
2. Bin Control Cleaning .............................................................................................. 37
D. Float Switch Check and Cleaning ............................................................................... 38
1. Float Switch Check ................................................................................................ 38
2. Float Switch Cleaning ............................................................................................ 39
E. Thermistor Check ........................................................................................................ 41
F. Diagnostic Charts ........................................................................................................ 42
1. No Ice Production ................................................................................................... 42
2. Evaporator is Frozen Up ........................................................................................ 45
3. Low Ice Production ................................................................................................ 47
4. Abnormal Ice ......................................................................................................... 48
5. Other ...................................................................................................................... 49
V. Removal and Replacement of Components .................................................................... 50
A. Service for Refrigerant Lines ....................................................................................... 50
1. Refrigerant Recovery ............................................................................................. 50
2. Brazing .................................................................................................................. 51
3. Evacuation and Recharge (R-404A) ...................................................................... 51
B. Removal and Replacement of Compressor ................................................................. 52
C. Removal and Replacement of Expansion Valve .......................................................... 53
D. Removal and Replacement of Hot Gas Valve or Liquid Line Valve ............................ 54
E. Removal and Replacement of Evaporator ................................................................... 55
F. Removal and Replacement of Air-Cooled Condenser .................................................. 56
G. Removal and Replacement of Water-Cooled Condenser ............................................ 56
