Hoshizaki Complete Sequence of Operation for Ice Machines

"E" and "G" Control Board Without Harvest Pump Timer Operation Flow Chart

Cycle

1. 1-Minute

2. Harvest Cycle

3. Freeze Cycle

4. Pump-Out Cycle

Steps

Fill Cycle

• Maximum inlet water valve time: 6 min.

• Minimum freeze time: 5 min.

• Factory set for every

• Maximum harvest time: 20 min.

• Maximum freeze time: freeze

10th cycle

timer setting

(except KM‑515M_H)

(S4 dip switch 9 & 10)

(S4 dip switch 5 & 6)

Thermistor in

1 to 3-min. harvest

5-min. minimum

• Pump motor stops for

2 sec., then reverses

FS in control

control

timer in control

freeze timer in

for 10/20 sec. (S4 dip

Startup

(S4 dip switch 1 & 2)

control

switch 3 & 4)

FS check

FS closed

FS check

FS closed

FS opens or

WV energized

Comp energized

Thermistor temperature

Comp continues

freeze timer

Comp continues

reaches 48°F (9°C) (3.9 kΩ

terminates

FMR continues

FMR energized

FMR continues

or less). Harvest timer starts

HGV energized

FS open

HGV energized

FM energized

(1 to 3 min.).

WV energized (KM-320M_H S4 dip

WV energized

LLV energized

switch 3 & 4)

PM energized

FS open

HGV de-energized

PM de-energizes for 2 sec.,

If FS is open, Comp stops and cycle returns to 1-min. fill.

WV de-energized

then reverses for 10/20 sec.

FM de-energized

LLV de-energized

14

Shutdown and Restart See next page.

1. "E" and "G" Control Board without Harvest Pump A. Sequence of Operation Flow Chart II. Sequence of Operation and ServiceDiagnosis

Legend:

Comp–compressor FM–fan motor FMR–fan motor-remote FS–float switch HGV–hot gas valve LLV–liquid line valve 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 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.

Timer Operation