Hoshizaki KM-901MAH, KM-901MWH Control Board Auxiliary Code U-1, Later, Fill Cycle, Icemaker Off

"G" Control Board Sequence Flow Chart KM-901MAH, KM-901MWH, KM-901MRH/3

Cycle Steps

1. 1-Minute

2. Harvest Cycle

3. Freeze Cycle

4. Pump-Out Cycle

• WV time: 6 min. or the length of harvest minus 0 or

Fill Cycle

50 sec. (S4 dip switch 7), whichever is shorter. DO

• Minimum freeze time: 5 min.

• Factory set for every

NOT ADJUST S4 dip switch 7 on this model.

• Maximum freeze time: freeze timer setting

10th cycle (S4 dip

(S4 dip switch 9 & 10)

switch 5 & 6)

• Maximum harvest time: 20 min.

• Pump motor stops

Thermistor in

1 to 3-min. timer in control

5-min. timer

F/S in control

for 2 sec., then

control

(S4 dip switch 1 & 2)

in control

reverses for 10/20

Harvest Pump

sec. (S4 dip switch

Timer

3 & 4)

Initial startup

0 or 50 sec.

begins here

after 5-sec.

F/S check

F/S closed

PM energized F/S check

F/S closed

F/S open or freeze

delay

WV de-energized

Comp continues

WV energized

WV continues

Comp continues

timer expires

Thermistor temperature

FMR continues

Comp energized

reaches 48°F (9°C) (3.9 kΩ

FMR continues

HGV energized

F/S open

FMR energized

or less). Harvest timer starts.

PM energized

PM de-energizes for 2 sec.,

HGV energized

FMS energized

then reverses for 10/20 sec.

LLV energized

FM de-energized

F/S open

HGV de-energized

LLV de-energized

25

If F/S is open, compressor stops and cycle returns to 1-Minute Fill Cycle

b) "G" Control Board: Auxiliary Code U-1 and

Shutdown and Restart

MBC Operation

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 expires. Otherwise, at the end of the next harvest cycle.

2. Icemaker Off

All components de-energized.

3. Ice Level Lowered

Ice level lowered. No ice pressing against MBC actuator paddle. Icemaker starts at

"1. 1-Minute Fill Cycle."

To 1 above

Later

MBC open

Green "BC CLOSED" LED off

Yellow "BC OPEN" LED on

Legend:

Comp–compressor

FM–fan motor

FMR–fan motor-remote

F/S–float switch

HGV–hot gas valve

LLV–liquid line valve

MBC–mechanical bin control

PM–pump motor

WV–inlet water valve

Yellow "BC OPEN" LED continues.	MBC closed
All components de‑energized	Green "BC CLOSED" LED on
	Yellow "BC OPEN" LED off

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 unit. 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 unit will not restart when the control switch is placed in the "ICE" position.