Hoshizaki 73180 service manual Fill Cycle

2. Auxiliary Codes A-2 and Later

After the power switch is placed in the "ON" position, the steps in the sequence are as outlined below.

a)Fill Cycle

LF/S and UF/S open, BCH and WV energize. LF/S closes. Nothing happens at this time. Reservoir continues to fill until UF/S closes.

b)Freeze Cycle

UF/S closes. BCH remains energized. WCR, TDR, GM, FM, CR, and Comp energize. WV de‑energizes. Ice production starts 4 to 6 minutes after Comp energizes depending on ambient and water conditions. F/S controls WV to refill as needed during the freeze cycle. The freeze cycle continues until BC shuts down the icemaker or power is turned off to the icemaker. Refill: As ice is produced, the water level in the reservoir drops and UF/S opens. When UF/S opens, a latching circuit through LF/S and WCR keeps WCR, TDR, GM, FM, CR, and Comp energized. When LF/S opens, WCR de-energizes, cutting power to TDR terminal #5 (O wire) and starting FT. WV energizes. Water fills the reservoir, UF/S closes. WCR energizes, restoring power to TDR terminal #5 (O wire) and resetting FT. WV de-energizes. If UF/S remains open longer than 90 seconds, FT terminates, cutting power to TDR terminal #9 (R wire). GM, FM, CR, and Comp de‑energize. WV remains energized until UF/S closes.

c)Bin Control Thermostat Shutdown

Ice fills storage bin to level of BC. BC opens within 10 seconds after ice contact. When BC opens, BCH remains energized. WCR, TDR, GM, FM, CR, and Comp de‑energize. When ice level lowers and BC closes, the icemaker starts operating again.

C-100BAF Series Sequence Flow Chart and Component Operation

(auxiliary codes A-2 and later)

	1. Fill Cycle	2. Freeze Cycle		Low Water Safety	3. Shutdown
				When UF/S closes,	Bin Full
			Refill	icemaker restarts at
			FT (in TDR)	2. Freeze Cycle.
Power Switch
			Maximum 90 seconds	90 seconds
"ON"

			FT			BC
				exceeded			open
	BC closed
BC closed		BC closed	BC closed		BC closed		BC open
UF/S open	LF/S closed	UF/S open	LF/S closed		UF/S open		BCH continues
LF/S open	UF/S closed	LF/S open	UF/S closed		FT exceeded		Comp de-energized
BCH energized	BCH continues	FT starts (90 sec.)	FT terminated		BCH continues		FM de-energized
WV energized	Comp energized	BCH continues	BCH continues		WV continues		GM de-energized
	FM energized	Comp continues	Comp continues		Comp de-energized		WV de-energized
	GM energized	FM continues	FM continues		FM de-energized
	WV de-energized	GM continues	GM continues		GM de-energized
		WV energized	WV de-energized

BC closed

Legend: BC–bin control thermostat; BCH–bin control heater; Comp–compressor; CR–compressor relay; FM–fan motor; FT–90-second fill timer (low water safety; internal to TDR); GM–gear motor; LF/S–lower float switch; TDR–time delay relay; UF/S–upper float switch; WCR–water control relay; WV–inlet water valve

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