Table Of Contents - Hoshizaki KM-251BAH Service Manual

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.
I. Specifications...................................................................................................................... 5
A. Icemaker ....................................................................................................................... 5
II. General Information ........................................................................................................... 6
A. Construction.................................................................................................................. 6
B. Sequence of Operation ................................................................................................. 7
1. One Minute Fill Cycle .............................................................................................. 7
2. Initial Harvest Cycle ................................................................................................ 7
3. Freeze Cycle ........................................................................................................... 7
4. Normal Harvest Cycle ............................................................................................ 7
C. Control Board.............................................................................................................. 10
1. Control Board Layout............................................................................................. 11
2. Features ................................................................................................................ 12
a) Maximum Water Supply Period - 6 minutes....................................................... 12
b) Harvest Backup Timer and Freeze Timer ........................................................... 12
c) High Temperature Safety .................................................................................... 12
d) Low Water Safety ............................................................................................... 12
e) High Voltage and Low Voltage Cut-outs ............................................................. 12
f) LED Lights and Audible Alarm Safeties............................................................... 13
3. Controls and Adjustments ..................................................................................... 14
a) Default Dip Switch Settings ................................................................................ 14
b) Harvest Control - Thermistor ............................................................................. 14
c) Harvest Timer (S4 dip switch 1 & 2) ................................................................... 15
d) S4 dip switch 3, 4, 5, 6, 7, & 8 ............................................................................ 15
e) Freeze Timer (S4 dip switch 9 & 10) .................................................................. 15
f) Float Switch Control and Refill Counter (S5 dip switch 1 through 5)................... 15
g) Bin Control.......................................................................................................... 16
4. Bin Control Troubleshooting................................................................................... 16
a) Machine Will Not Start........................................................................................ 16
b) Machine Will Not Shut Off .................................................................................. 16
5. Float Switch Troubleshooting................................................................................. 16
6. Control Board Check Procedure............................................................................ 17
7. Control Board Replacement .................................................................................. 18
III. Technical Information ...................................................................................................... 19
A. Water Circuit and Refrigeration Circuit........................................................................ 19
B. Wiring Diagram............................................................................................................ 20
C. Performance Data ....................................................................................................... 21
CONTENTS
3