Hoshizaki KM-320MAH - Manual (Page 3)

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Please review this manual. It should be read carefully before the icemaker is serviced or
maintenance operations are performed. Only qualified service technicians should service
and maintain the icemaker. This manual should be made available to the technician prior to
service or maintenance.
CONTENTS
I. Specifications ...................................................................................................................... 5
A. KM-320MAH (air-cooled) .............................................................................................. 5
B. KM-320MWH (water-cooled) ......................................................................................... 6
II. General Information ........................................................................................................... 7
A. Construction .................................................................................................................. 7
1. KM-320MAH (air-cooled) ......................................................................................... 7
2. KM-320MWH (water-cooled) ................................................................................... 8
B. Controller Board ............................................................................................................ 9
1. Solid-State Control .................................................................................................. 9
2. Controller Board ...................................................................................................... 9
3. Sequence .............................................................................................................. 13
4. Controls and Adjustments .................................................................................... 16
5. Checking the Controller Board .............................................................................. 19
III. Technical Information ...................................................................................................... 21
A. Water Circuit and Refrigerant Circuit ........................................................................... 21
1. KM-320MAH .......................................................................................................... 21
2. KM-320MWH ......................................................................................................... 22
B. Wiring Diagram ............................................................................................................ 23
1. KM-320MAH, KM-320MWH .................................................................................. 23
C. Timing Chart .............................................................................................................. 24
D. Performance Data ....................................................................................................... 26
1. KM-320MAH .......................................................................................................... 26
2. KM-320MWH ......................................................................................................... 27
IV. Service Diagnosis ........................................................................................................... 28
A. No Ice Production........................................................................................................ 28
B. Evaporator is Frozen Up.............................................................................................. 31
C. Low Ice Production ..................................................................................................... 33
D. Abnormal Ice ............................................................................................................... 33
E. Other ........................................................................................................................... 33
V. Removal and Replacement of Components .................................................................... 34
A. Service for Refrigerant Lines ...................................................................................... 34
1. Refrigerant Recovery ............................................................................................. 34
2. Evacuation and Recharge (R-404A) ...................................................................... 34
B. Brazing ........................................................................................................................ 35
C. Removal and Replacement of Compressor ................................................................ 36
D. Removal and Replacement of Drier ............................................................................ 37
E. Removal and Replacement of Expansion Valve .......................................................... 37
F. Removal and Replacement of Hot Gas Valve and Line Valve ...................................... 38
G. Removal and Replacement of Evaporator .................................................................. 39
H. Removal and Replacement of Thermistor ................................................................... 40
I. Removal and Replacement of Fan Motor ..................................................................... 41
J. Removal and Replacement of Water Valve .................................................................. 41