Hoshizaki DCM-500BWH-OS service manual Startup

DCM-500BAH(-OS), DCM-500BWH(-OS) Sequence Flow Chart and Component Operation

4. 12 Hour Drain Cycle

DV opens for 20 minutes every 12 hours

See "3. 12 Hour Drain Cycle" below.

1. Startup

Power switch "ON" Control switch in "ICE"

1. Fill Cycle

2.Ice Purge Cycle

60 seconds

3. Freeze Cycle

Refill (90 seconds)

Low Water Safety

If refill > 90 sec. FT, 150 second shutdown sequence begins

150 sec. Shutdown Sequence

90 seconds 60 seconds

13

WV on		LF/S closed	Comp on	UF/S open	LF/S closed	UF/S open	Comp off	GM off
	UF/S open
		UF/S closed (WV off)	FMS on	LF/S open (WV on)	UF/S closed (WV off)	FT exceeded	FMS off	GMPR off
		WCR on	WCR continues	WCR off	WCR on	Comp continues	WV continues	WV continues until
		WV off	GM continues	FT started (90 sec.)	FT off (90 sec.)	FMS continues	GM continues	UF/S closes
		GM on	GMPR continues WV on		WV off	GM continues	GMPR continues
		GMPR on		Comp continues	Comp continues	GMPR continues
				FMS continues	FMS continues	WV continues
				GM continues	GM continues
				GMPR continues	GMPR continues

2.Shutdown & Restart

3.12 Hour Drain Cycle Shutdown & Restart

	1. Bin Full		2. Ice Purge Cycle
150
		seconds
	90 seconds		60 seconds
1. Drain Cycle initiates			2. Ice Purge Cycle

3. Icemaker is Off	4. Ice Level Lowered
	See "1. Fill Cycle" above

3. Drain Cycle	4. 12 hour DC - Restart
DV on for 20 minutes	See "1. Fill Cycle" above

Legend:

BC - bin control Comp - compressor DC - drain cycle DT - drain timer DV - drain valve

FMS - self-contained fan motor

BC open or DC starts	Comp off	GM off	BC closed
Comp continues	FMS off	GMPR off	or
FMS continues	GM continues	DV on (DC only)	20 Min. DT off (DC only)
GM continues	GMPR continues		DV off (DC only)
GMPR continues			12 hour DT reset (DC only)

Components Energized when the Control Switch is in the "DRAIN" Position

The "DRAIN" position on the control switch is used when cleaning and sanitizing the unit. This allows cleaner and sanitizer to drain from the reservoir and evaporator assembly. When switching to the "DRAIN" position during the freeze cycle, the drain valve does not energize until the 150 second shutdown sequence terminates (2. Shutdown & Restart).

Note: To bypass the 150 second shutdown sequence, move the power switch to the "OFF" position, place the control switch in the "DRAIN" position, then move the power switch back to the "ON" position.

FT - fill timer (low water safety) GM - gear motor

GMPR - gear motor protect relay LF/S - lower float switch

UF/S - upper float switch WCR - water control relay WV - inlet water valve