4
(3) 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-second delay, then CR (X1 on CB) and
Comp (LLV and SLV on MLH models) de-energize and the 5-minute ice purge timer
begins. When the 5-minute ice purge timer terminates, GMR (X on CB), GM, GMPR,
and FM/FMR de-energize. DV energizes to drain the evaporator and reservoir. To
avoid the 5-minute 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.
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 lls the storage bin to the
level of activating IS, IS 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), IS shutdown delay timer (S1 dip switch
1, , & 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.4.b) Infrared Sensor Shutdown Delay
(S1 dip switch 1, , & 3)." Once IS shutdown delay timer terminates, CR (X1 on CB)
and Comp (LLV and SLV on MLH models) de-energize and the 5-minute ice purge
timer begins. When the 5-minute ice purge timer terminates, GMR (X on CB), GM,
GMPR, and FM/FMR de-energize. See "II.D. Bin Control."
Note: If IS fails to shutdown the icemaker, MBC opens, CB shuts down the icemaker
and a 9-beep alarm sounds.
(2) Mechanical Bin Control: CB shuts down the entire unit within 10 seconds when
MBC opens (actuator paddle engaged), and sounds a 9-beep alarm. For further
details, see "II.C.4.f) Mechanical Bin Control Shutdown Delay (S1 dip switch 8)" and
"II.D. Bin Control."
Legend: BC–bin control; CB–control board; Comp–compressor;
CR–compressor relay; DT–drain timer; DV–drain valve; FM–fan motor;
FMR–fan motor-remote; GM–gear motor; GMPR–gear motor protect relay;
GMR–gear motor relay; IS–infrared sensor; LF/S–lower oat switch;
LLV–liquid line valve (MLH model); MBC–mechanical bin control;
SLV–suction line valve (MLH model); UF/S–upper oat switch; WV–inlet
water valve