Service Manual

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c) Manual Drain: Manual drain is used when servicing evaporator components and
cleaning and sanitizing the unit. When the unit is making ice and the control switch
is moved to the "DRAIN" position, there is a 3-sec. delay, then Comp or LLV/SLV
(MLH models) de-energize and the 5-min. ice purge timer begins. When the 5-min.
ice purge timer terminates, GM, and FM/FMR de-energize. DV energizes to drain
the evaporator and reservoir. To avoid the 5-min. shutdown delay, turn off the power
supply, then move the control switch to the "DRAIN" position. Turn on the power
supply. DV energizes to drain the evaporator and reservoir. DV de-energizes when
the control switch is moved to the "ICE" position.
10) Shutdown
a) BC1 (infrared sensor): When power is supplied to the icemaker, the green LED on
BC1 turns on. The green LED remains on constantly. As ice lls the storage bin to
the level of activating BC1, BC1 yellow LED turns on (ashing or steady). The yellow
LED ashes when ice is at the outer limit of its range and turns steady as ice nears.
After the yellow LED turns on (ashing or steady), BC1 shutdown delay timer (S1 dip
switch 1, 2, 3) starts. For a typical dispenser unit application, a 100-sec. shutdown
delay is recommended. When used with a standard Hoshizaki storage bin, any
shutdown delay setting is acceptable. See "III.B.2. BC1 (Infrared Sensor) Shutdown
Delay (S1 dip switch 1, 2, 3)." Once BC1 shutdown delay timer terminates, Comp or
LLV/SLV (MLH models) de-energize and the 5-min. ice purge timer starts. When
the 5-min. ice purge timer terminates, GM, CCR/GMPR, and FM/FMR de-energize.
Diagnosis: See "II.D.1. Bin Control 1 (infrared sensor) Check."
Note: When BC1 and BC2 are applied–If BC1 fails to shut down the icemaker, BC2
opens, CB shuts down the icemaker and sounds a 9-beep alarm.
b) BC(2) (mechanical stand-alone or backup):
BC (stand-alone): BC opens (actuator paddle engaged). CB shuts down the
icemaker within 10 sec.
BC2 (backup): BC2 opens (actuator paddle engaged). CB shuts down the icemaker
immediately and sounds a 9-beep alarm.
Diagnosis: See "II.D.2. Bin Control(2) (mechanical stand-alone or backup) Check."
Legend: BC1–bin control 1 (infrared sensor); BC(2)–bin control (2) (mechanical stand-alone
or backup); CB–control board; CCR–compressor control relay (formerly GMPR
gear motor protect relay); Comp–compressor; DV–drain valve; EH–evaporator
heater (-C model except FD-650); FM–fan motor; FMR–fan motor-remote;
GM–gear motor; GMR–gear motor relay; LFS–lower oat switch; LLV –liquid line
valve (MLH model); S LV–suction line valve (MLH model); UFS–upper oat switch;
WV–inlet water valve