E) Shutdown Cycle - Hoshizaki MODULAR CUBELET SERENITY SERIES FS-1022MLH-C Service Manual

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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