Hoshizaki 73180 service manual Sequence of Operation, Freeze Cycle

B. Sequence of Operation

1. Auxiliary Codes A-1 and Earlier

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

a)Freeze Cycle

BCH, GM, FM, CR, and Comp energize. NOTICE! Some units contain a sticker that states: "The bin control heater has been disconnected. DO NOT reconnect the bin control heater." In this case, leave BCH disconnected or replace BC assembly with 3A2561A03. Ice production starts 4 to 6 minutes after Comp energizes depending on ambient and water conditions. The freeze cycle continues until BC shuts down the icemaker or power is turned off to the icemaker. Refill: The float-operated WV allows water into the reservoir as needed to continue the icemaking process. If the water supply is cut off or GM stops during the freeze cycle, the cold evaporator temperature causes STS to open and de‑energize all components except BCH and optional drain pump HS‑0248.

b)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. 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-1 and earlier)

		Low Water/	2. Shutdown
	1. Freeze Cycle
		Freeze-Up Safety	Bin Full
	Refill	When STS closes,
	Float-operated WV allows	icemaker restarts at
Power Switch	water into reservoir as needed.	1. Freeze Cycle.
"ON"

	STS	open		BC	open
BC closed	BC closed		BC closed		BC open
STS closed	STS closed		STS open		STS closed
BCH energized	BCH continues		BCH continues		BCH continues
Comp energized	Comp continues		Comp de-energized		Comp de-energized
FM energized	FM continues		FM de-energized		FM de-energized
GM energized	GM continues		GM de-energized		GM de-energized

BC closed

Legend: BC–bin control thermostat; BCH–bin control heater; Comp–compressor; CR–compressor relay; FM–fan motor; GM–gear motor; STS–suction temperature safety (low water/freeze-up safety); WV–inlet water valve

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