Hoshizaki KMD-901MAH, Service Manual

Page: 3 / 58

3
CONTENTS
I. Specifications ...................................................................................................................... 5
A. Icemaker ....................................................................................................................... 5
1. KMD-901MAH (air-cooled) ....................................................................................... 5
2. KMD-901MWH (water-cooled) ................................................................................. 6
3. KMD-901MRH (remote air-cooled) .......................................................................... 7
B. Condenser Unit ............................................................................................................. 8
1. URC-9F .................................................................................................................... 8
II. General Information ......................................................................................................... 10
A. Construction ................................................................................................................ 10
1. KMD-901MAH (air-cooled) ..................................................................................... 10
2. KMD-901MWH (water-cooled) ................................................................................11
3. KMD-901MRH (remote air-cooled) ........................................................................ 12
B. Sequence of Operation ............................................................................................... 13
1. One Minute Fill Cycle ............................................................................................. 13
2. Initial Harvest Cycle .............................................................................................. 13
3. Freeze Cycle ......................................................................................................... 13
4. Pump-Out Cycle ................................................................................................... 13
5. Normal Harvest Cycle ........................................................................................... 14
C. Control Board .............................................................................................................. 16
1. Control Board Layout ............................................................................................. 17
2. Features ................................................................................................................. 18
a) Maximum Water Supply Period – 6 minutes ....................................................... 18
b) Harvest Backup Timer and Freeze Timer ........................................................... 18
c) High Temperature Safety .................................................................................... 18
d) Low Water Safety ............................................................................................... 18
e) High Voltage and Low Voltage Cut-outs ............................................................. 18
f) LED Lights and Audible Alarm Safeties ............................................................... 19
3. Controls and Adjustments ...................................................................................... 20
a) Default Dip Switch Settings ................................................................................ 20
b) Harvest Timer (S4 dip switch 1 & 2) ................................................................... 20
c) Pump-Out Timer (S4 dip switch 3 & 4)................................................................ 21
d) Pump-Out Frequency Control (S4 dip switch 5 & 6) ........................................... 21
e) S4 Dip Switch 7 & 8 ........................................................................................... 22
f) Freeze Timer (S4 dip switch 9 & 10) .................................................................... 22
g) Float Switch Control (S5 dip switch 1 through 5) ................................................ 22
4. Control Board Check Procedure ............................................................................ 22
5. Control Board Replacement ................................................................................ 23
D. Harvest Control – Thermistor ...................................................................................... 23
IMPORTANT
This manual should be read carefully before the icemaker is serviced or
maintenance operations are performed. Only qualified service technicians
should install, service, and maintain the icemaker. Read the warnings
contained in this booklet carefully as they give important information regarding
safety. Please retain this booklet for any further reference that may be
necessary.