Hoshizaki FS-1022MLH-C service manual Shutdown Cycle

e)Shutdown Cycle

(1)Infrared Sensor: When power is supplied to the icemaker, the green LED on IS turns on. The green LED remains on constantly. As ice fills the storage bin to the level of activating IS, IS yellow LED turns on (flashing or steady). The yellow LED flashes when ice is at the outer limit of its range and turns steady as ice nears. After the yellow LED turns on (flashing or steady), IS shutdown delay timer (S1 dip switch

1, 2, 3) begins. For a typical dispenser unit application, a 100‑second shutdown delay is recommended. When used with a standard Hoshizaki storage bin, any shutdown delay setting is acceptable. See "II.C.3.b) Infrared Sensor Shutdown Delay (S1 dip switch 1, 2, 3)." Once IS shutdown delay timer terminates, CR (X1 on CB) and PDS de‑energize and the 5‑minute ice purge timer begins. Unit is in pump-down mode. Once the low-side pressure drops to 9 PSIG, CLPS opens, de-energizing MC, Comp,

and FMR. When the 5-minute ice purge timer terminates, GMR (X2 on CB), GM, and GMPR de-energize.

Note: If IS fails to shut down the icemaker, MBC opens, CB shuts down the icemaker, and a 9-beep alarm sounds.

(2)Mechanical Backup Bin Control: CB shuts down the entire unit within 10 seconds when MBC opens (actuator paddle engaged), and sounds a 9-beep alarm.

Legend: CB–control board; CCH–crankcase heater; CLPS–control low-pressure switch; Comp–compressor; CR–compressor relay (pump-down solenoid); DT–drain timer; DV–drain valve; EH–evaporator heater; FMR–fan motor‑remote; F/S–float switch; GM–gear motor; GMPR–gear motor protect relay; GMR–gear motor relay; IS–infrared sensor; LF/S–lower float switch; MBC–mechanical backup bin control; MC–magnetic contactor; PDS–pump‑down solenoid valve; UF/S–upper float switch; WV–inlet water valve

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