Hoshizaki KM-901MAH Service Manual page 4

3. Controls and Adjustments ...................................................................................... 32
a) Default Dip Switch Settings .............................................................................. 32
b) Harvest Timer (S4 dip switch 1 & 2) ................................................................. 32
c) Pump-Out Timer (S4 dip switch 3 & 4) ............................................................. 33
d) Pump-Out Frequency Control (S4 dip switch 5 & 6)......................................... 33
e) Bin Control Selector/Harvest Pump Timer (S4 dip switch 7) ............................ 34
f) Factory Use (S4 dip switch 8) ........................................................................... 34
g) Freeze Timer (S4 dip switch 9 & 10) ................................................................ 35
h) Float Switch Control (S5 dip switch 1): "G" Control Board .............................. 35
i) Refill Counter (S5 dip switch 2 through 5): "G" Control Board ........................... 35
D. Bin Control .................................................................................................................. 36
1. Thermostatic Bin Control: Auxiliary Code T-0, U-0 ................................................. 36
2. Mechanical Bin Control: Auxiliary Code U-1 and Later .......................................... 36
E. Float Switch ................................................................................................................. 36
F. Thermistor .................................................................................................................... 36
G. Control Switch ............................................................................................................. 36
III. Technical Information ...................................................................................................... 37
A. Water Circuit and Refrigeration Circuit ........................................................................ 37
1. KM-901MAH (air-cooled) ........................................................................................ 37
2. KM-901MWH (water-cooled) ................................................................................. 38
3. KM-901MRH/3 (remote air-cooled) ........................................................................ 39
B. Wiring Diagrams .......................................................................................................... 40
1. Thermostatic Bin Control: Auxiliary Code T-0, U-0 ................................................. 40
a) KM-901MAH (air-cooled) and KM-901MWH (water-cooled) ............................. 40
b) KM-901MRH (remote air-cooled) ..................................................................... 41
c) KM-901MRH3 (remote air-cooled) .................................................................... 42
2. Mechanical Bin Control: Auxiliary Code U-1 and Later .......................................... 43
a) KM-901MAH (air-cooled) and KM-901MWH (water-cooled) ............................. 43
b) KM-901MRH (remote air-cooled) ..................................................................... 44
c) KM-901MRH3 (remote air-cooled) .................................................................... 45
C. Performance Data ....................................................................................................... 46
1. KM-901MAH (air-cooled) ........................................................................................ 46
2. KM-901MWH (water-cooled) ................................................................................. 47
3. KM-901MRH (remote air-cooled) ........................................................................... 48
4. KM-901MRH3 (remote air-cooled) ......................................................................... 49
IV. Service Diagnosis ........................................................................................................... 50
A. Diagnostic Procedure .................................................................................................. 50
B. Control Board Check ................................................................................................... 53
C. Bin Control Check ....................................................................................................... 54
1. Thermostatic Bin Control Check: Auxiliary Code T-0, U-0 ...................................... 54
2. Mechanical Bin Control Check and Cleaning: Auxiliary Code U-1 and Later ......... 55
a) Mechanical Bin Control Check ......................................................................... 55
b) Mechanical Bin Control Cleaning ..................................................................... 56
D. Float Switch Check and Cleaning ............................................................................... 57
1. Float Switch Check ................................................................................................ 57
2. Float Switch Cleaning ............................................................................................ 58
E. Thermistor Check ........................................................................................................ 59
F. Diagnostic Charts ........................................................................................................ 60
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