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) BC (mechanical stand-alone): BC opens (actuator paddle engaged). CB shuts down
the icemaker within 10 sec.
Diagnosis: See "II.D.2. Bin Control (2) (mechanical stand-alone or backup) Check."
b) 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, and FM/FMR de-energize. See "II.D. Bin
Control 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.
c) BC2 (mechanical 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) Check."
Legend: BC–bin control (mechanical stand-alone); BC1–bin control 1 (infrared
sensor); BC2 (mechanical backup); CB–control board; CCR–compressor
control relay (formerly 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);
SLV–suction line valve (MLH model); UFS–upper oat switch;
WV–inlet water valve