Hoshizaki KM-320MWH, KM-320MAH service manual Contents

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