Hoshizaki dcm-75ibah Control Board Sequence Flow Chart DCM-751BH-OS, Operation, Diagnosis

"F-A" Control Board Sequence Flow Chart

DCM-751B_H(-OS)

4. 1-in-12 Drain Cycle - Although the factory default 1-in-1 drain cycle is recommended, a 1-in-12 drain cycle is available. For 1-in-12 drain cycle sequence, see "3. 1-in-12 Drain Cycle & Restart (optional)."

A. Sequence of II. Sequence of

1. Startup

Power Switch "ON" Control Switch in "ICE" Safety Switch closed "POWER OK" LED on

1. Fill Cycle

Maximum

90 seconds

2. Ice Purge Cycle

To bypass, press the "SERVICE" button after GM starts.

5 sec. 5 minutes

3. Freeze Cycle

1-in-1 drain cycle. DV energizes for 2 seconds every hour
(S1 Dip Switch 4).	Refill
Does not affect operation.
	Maximum
	90 seconds

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

OperationFlow Operation and

	WV energized	LFS closed	GM energized	Comp energized	UFS open	LFS closed	1-beep alarm sounds	1-beep alarm continues
		UFS closed	GMPR energized	FM energized	LFS open	UFS closed	PT starts	WV energized
	FT starts (90 sec.)
		FT terminates		GM energized	FT starts (90 sec.)	FT terminates	UFS open	GM de-energized
		WV de-energized		GMPR energized	WV energized	WV de-energized	WV energized	GMPR de-energized
12	If Fill > 90 sec. FT				Comp energized	Comp energized	Comp de-energized
	1-beep alarm sounds				FM energized	FM energized	FM de-energized
	WV energized				GM energized	GM energized	GM energized
	When UFS closes				GMPR energized	GMPR energized	GMPR energized
	alarm resets and

2. Ice Purge Cycle starts.

Chart	Service
	Diagnosis

2.Bin Control Shutdown & Restart

BC open (BC actuator paddle engaged)

1. Bin Full	2. Icemaker Off	3. Icemaker Restart
6 to 10 sec.		Ice level lowered

to "2. Ice Purge Cycle" above

All Components de-energizedBC closed

(BC actuator paddle disengaged)

Legend: BC-bin control Comp-compressorDC-drain cycle DT-drain timer DV-drain valve FM-fan motor

3. 1-in-12 Drain Cycle	1. DT Initiates DC 2. Ice Purge Cycle	3. 10-Minute Drain 4. Icemaker Restart
& Restart (optional)	5 minutes		to "1. Fill Cycle" above
(S1 dip switch 4)
	Comp de-energized	DV energized	10-min. DT terminates
	FM de-energized	GM de-energized	DV de-energized
	GM energized	GMPR de-energized	1-in-12 DT reset
	GMPR energized

FT-fill timer (low water safety) GM-gear motor GMPR-gear motor protect relay LFS-lower float switch PT-purge timer

UFS-upper float switch WV-inlet water valve