Hoshizaki DCM 300BAH(-OS) B. Sequence of Operation, Sequence Cycles and Shutdown, a Fill Cycle

B. Sequence of Operation

1. Sequence Cycles and Shutdown

The steps in the sequence are as outlined below. When power is supplied, power switch is in the "ON" position, safety switch is engaged, and the control switch is in the "ICE" position, CB "POWER" LED turns on. The "POWER" LED indicates control voltage and will remain on unless a control voltage problem occurs. If icemaker does not start, BC actuator and proximity switch may be engaged. Move the dispense mode switch to the "CONTINUOUS" position, then dispense ice to lower the level of ice in the storage bin.

a)Fill Cycle

Reservoir is empty. LF/S and UF/S are open. WV energizes and fill cycle starts.

LF/S closes. Nothing happens at this time. Reservoir continues to fill until UF/S closes. When UF/S closes, WCR energizes, closing low water safety circuit and de‑energizing WV. GM energizes once UF/S closes.

b)Ice Purge Cycle

"GM" LED is on. GM energizes. 60-sec. ice purge timer starts. Note: GM cannot energize unless UF/S is closed.

c)Freeze Cycle

"COMP" and "GM" LEDs are on. 60-sec. ice purge timer terminates. GM continues. CB confirms GM operation through GMPR terminal #3 (BR wire) and terminal

#5 (DBU wire), then Comp and FM energize. Ice production starts 4 to 6 min. after Comp energizes depending on ambient and water temperature conditions. UF/S and LF/S operate WV as needed to continue the icemaking process. Refill: As ice is produced the water level in the reservoir drops. UF/S opens. Nothing happens at this time. LF/S opens. FT starts. WCR de‑energizes, energizing WV. As water fills the reservoir, LF/S closes. Nothing happens at this time. Water continues to fill and UF/S closes. FT terminates and WCR energizes, closing low water safety circuit and de-energizing WV. If UF/S remains open longer than 90 sec. after LF/S opens (FT exceeded), Comp and FM de-energize. GM de-energizes 60 sec. later. WV remains energized until UF/S closes. The freeze cycle continues until BC shuts the icemaker down, a drain cycle occurs, or power is turned off to the icemaker.

d)Drain Cycle

"FLUSH" LED is on. The drain cycle occurs once every 12 hrs. for 20 min.

12-hr. DCT terminates, DVT starts. Comp and FM de-energize. GM de‑energizes 60 sec. later. DV energizes. DV remains energized for the remainder of the drain cycle.

e)Shutdown

BC activates, 150-sec. shutdown sequence starts. After 90 sec., Comp and FM de‑energize, AM energizes for 0.6 seconds, 60 sec. later, GM de-energizes.

Legend: AM–agitating motor; BC–bin control; CB–control board; Comp–compressor; DCT–drain cycle timer (12-hr. timer); DV–drain valve; DVT–drain valve timer (20‑min. timer); FM–fan motor; FT–fill timer (90-sec. 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

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