Hoshizaki service manual Control Board Sequence Flow Chart FS-1022MLH-C/SRC-10H

"F-A" Control Board Sequence Flow Chart

FS-1022MLH-C/SRC-10H

2.

1. Startup

Power Switch "ON" Control Switch in "ICE" POWER OK LED on IS Green LED on

IS Yellow LED off

4. 1-in-12 Drain Cycle - Although the factory default 1-in-1 drain cycle

1.Fill Cycle is recommended, a 1-in-12 drain cycle is available. For 1-in-12 drain

If Fill > 90 sec.	cycle sequence, see "3. 1-in-12 Hour Drain Cycle & Restart (optional)."
FT 1-beep alarm
sounds.
When UF/S	2. Ice Purge Cycle
closes alarm				3. Freeze Cycle
	To bypass, press the		1-in-1 drain cycle. DV opens for 2 seconds every
resets and
	"SERVICE" button		hour (S1 Dip Switch 4).
2. Ice Purge
					Refill
	after GM starts.		Icemaker status
Cycle starts.
			does not change.		FT Maximum
Maximum	30 sec.	5 minutes			90 seconds
90 seconds
					FT terminates
					(90 sec.)

Low Water Safety	When UF/S closes,
90 sec. FT exceeded	alarm resets and
1-beep alarm sounds	2. Ice Purge Cycle
90 sec. PT begins	starts.
90 seconds
FT	PT
	terminates
exceeded

Sequence Flow Chart

15

WV energizes

FT starts (90 sec.)

LF/S closed	EH energizes	PDS energizes	UF/S open	LF/S closed	UF/S open
UF/S closed	GM energizes	CLPS closes	LF/S open	UF/S closed	FT exceeded
FT terminates		Comp energizes	FT starts (90 sec.)	FT terminates	1-beep alarm sounds
WV de-energizes		FMR energizes	WV energizes	WV de-energizes	PDS de-energizes
		EH continues	Comp continues	Comp continues	CLPS opens
		GM continues	EH continues	EH continues	Comp de-energizes
			FMR continues	FMR continues	FMR de-energizes
			GM continues	GM continues	EH continues
			PDS continues	PDS continues	GM continues
					WV continues

1-beep alarm continues WV continues

EH de-energizes

GM de-energizes

2. Infrared Sensor Shutdown & Restart

Note: If IS fails to shutdown the

1. Bin Full

2. Ice Purge Cycle

3. Icemaker Off

4. Icemaker Restart

icemaker, MBC opens and a

9-beep alarm sounds.

IS delay determined by S1 dip switch

1, 2, 3

IS Green LED on

IS Green LED on

IS Green LED on

IS Yellow LED off

IS Yellow LED (flashing or steady)

IS Yellow LED off

5 minutes

3. 1-in-12 Drain Cycle

to "2. Ice Purge Cycle" above

1. DT Initiates DC

2. Ice Purge Cycle

3. 10-Minute

4. Icemaker Restart

& Restart (optional)

Drain

to "1. Fill Cycle" above

(S1 dip switch 4)

IS activated or DC starts

DV energizes (DC only) 10-min. DT terminates (DC only)

PDS de-energizes

GM de-energizes

DV de-energizes (DC only)

Legend:

CLPS-control low-pressure switch

LF/S-lower float switch

CLPS opens

1-in-12 DT reset (DC only)

Comp-compressor

MBC-mechanical backup

Comp de-energizes

DC-drain cycle

bin control

FMR de-energizes

DT-drain timer

PDS-pump-down solenoid valve

GM continues

DV-drain valve

PT-purge timer

EH-evaporator heater

UF/S-upper float switch

FMR-fan motor-remote

WV-water valve

FT-fill timer (low water safety)

GM-gear motor

IS-infrared sensor bin control