KM-650MAH-E Service manual - Hoshizaki

"G" Control Board Sequence Flow Chart
KM-320MAH-E, KM-515MAH-E, KM-650MAH-E
b) "G" Control Board:
KM-320MAH-E and KM-650MAH-E Auxiliary Code U-1 and Later
KM-515MAH-E Auxiliary Code U-2 and Later
2. Harvest Cycle
4. Pump-Out Cycle
• Factory set for every
10th cycle (S4 dip
switch 5 & 6)
• Pump motor stops
for 2 sec., then
reverses for 10/20
sec. (S4 dip switch
3 & 4)
3. Freeze Cycle
• Minimum freeze time: 5 min.
• Maximum freeze time: freeze
timer setting
(S4 dip switch 9 & 10)
• Maximum inlet water valve time: 6 min.
• Maximum harvest time: 20 min.
1. 1-Minute
Fill Cycle
Cycle
Steps
1 to 3-min. harvest timer in
control (S4 dip switch 1 & 2)
Thermistor
in control
F/S in control
5-min.
minimum
freeze timer
in control
Startup
F/S closed
F/S closed
F/S check
F/S check
Comp continues
HGV energized
WV energized (dependent on
pump-out timer setting)
PM de-energizes for 2 sec.,
then reverses for 10/20 sec.
FM de-energized
LLV de-energized
F/S open or
freeze timer
terminates
Comp continues
FM energized
LLV energized
PM energized
HGV de-energized
WV de-energized
WV continues
Comp energized
HGV energized
WV energized
Thermistor temperature reaches
48°F (9°C) (3.9 kΩ or less).
Harvest timer starts (1 to 3 min.).
F/S open
F/S open
If F/S is open, Comp stops and cycle returns to 1-min. fill.
18
3. Ice Level Lowered
Icemaker starts at
"1. 1-Minute Fill Cycle."
2. Icemaker Off
All components
de-energized.
1. Bin Full
Shutdown Delay:
• Fill Cycle–15 sec. after activation.
• Harvest Cycle–At the end of the harvest cycle, or up to 15 sec. into the
freeze cycle if activated at the end of the harvest cycle.
• Freeze Cycle–15 sec. after activation if activated at least 15 sec. before
the 5-min. short cycle protection timer terminates
Otherwise, at the end of the next harvest cycle.
Shutdown
and Restart
To 1 above
MBC Operation
MBC closed
(MBC actuator paddle disengaged)
Green "BC CLOSED" LED on
Yellow "BC OPEN" LED off
Yellow "BC OPEN" LED continues.
All components de‐energized
MBC open (MBC actuator paddle engaged)
Green "BC CLOSED" LED off
Yellow "BC OPEN" LED on
Components Energized when the Control Switch is in the "WASH" Position
The "WASH" position on the control switch is used when cleaning and sanitizing the icemaker. When in the "WASH"
position, power is supplied to the pump motor. With the cleaning valve closed, the cleaner and sanitizer flow over the
outside of the evaporator plate assembly. With the cleaning valve open, the cleaner and sanitizer flow over both the
outside and the inside of the evaporator plate assembly.
Note: Close the cleaning valve after cleaning and sanitizing are complete, otherwise the icemaker will not restart
when the control switch is placed in the "ICE" position.
Legend:
Comp–compressor
FM–fan motor
F/S–float switch
HGV–hot gas valve
LLV–liquid line valve (KM-515MAH-E)
MBC–mechanical bin control
PM–pump motor
WV–inlet water valve