Hoshizaki KM-901MWH, KM-901MAH, KM-901MRH/3 Control Board Sequence Flow Chart, Cycle, Bin Full

"E" Control Board Sequence Flow Chart

KM-901MAH, KM-901MWH, KM-901MRH/3

Cycle Steps

1. 1-Minute Fill

2. Harvest Cycle

3. Freeze Cycle

4. Pump-Out Cycle

• Factory set for every

Cycle

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

• Minimum freeze time: 5 min.

10th cycle (S4 dip

whichever is shorter.

• Maximum freeze time: freeze timer setting

• Maximum harvest time: 20 min.

(S4 dip switch 9 & 10

switch 5 & 6)

• Pump motor stops

for 2 sec., then

Thermistor in control

1 to 3-min. timer in control

5-min. timer

F/S in control

reverses for 10/20

sec. (S4 dip switch

Initial startup

(S4 dip switch 1 & 2)

in control

3 & 4)

begins here

F/S Check

F/S closed

F/S Check

F/S closed

F/S open or freeze

after 5 sec.

delay

WV energized

WV continues

Thermistor temperature

Comp continues

timer expires

Comp continues

Comp energized

reaches 48°F (9°C)

FMR continues

FMR continues

F/S open

HGV energized

(3.9 kΩ or less) Harvest

PM energized

HGV energized

FMR energized

timer starts

FM energized

PM de-energizes for 2 sec.,

LLV energized

then reverses for 10/20 sec.

HGV de-energized

F/S open

FM de-energized

WV de-energized

LLV de-energized

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

a) "E" Control Board: Auxiliary	2. Sequence Flow Chart
Code T-0, U-

24	Shutdown	1. Bin Full
		Unit shuts down
	and Restart
		within 10 sec.
		after ice contacts
		thermostatic bulb.
TBC Operation

2. Icemaker Off	3. Ice Level Lowered
All components	Ice level lowered. No ice
de-energized.	touching thermostatic
	bulb. Icemaker starts at
	"1. 1-Minute Fill Cycle."
	To 1 above

0

Ice contacts	TBC open	TBC closed
thermostatic bulb	All components
	de-energized

Legend:

Comp–compressor FM–fan motor FMR–fan motor-remote F/S–float switch HGV–hot gas valve LLV–liquid line valve

TBC–thermostatic bin control PM–pump motor WV–inlet water valve

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.