Hoshizaki F-500BAJ Service Manual page 18

11) Drain Cycle
a) 1-in-1 Drain Cycle: DV energizes once every hour when the 1-in-1 drain cycle is
activated (S1 dip switch 4 in the "OFF" position (factory default position)). GM,
FM, Comp continue. DV energizes for 2 sec. every hour. This setting is
recommended for optimum icemaker performance. The 1-in-1 drain cycle allows any
sediment to drain from the evaporator without interrupting the icemaking process.
b) 1-in-12 Drain Cycle (optional): DV energizes once every 12 hours when the 1-in-12
drain cycle is activated (S1 dip switch 4 in the on position (optional)). 12-hour drain
cycle timer terminates, Comp and FM de-energize. GM and CCR continue. The
5-min. ice purge timer starts. When the 5-min. ice purge timer terminates, GM and
CCR de-energize. 10-min. DT starts, DV energizes. After 10-min. DT terminates, DV
de-energizes icemaking process restarts and 12-hour drain cycle timer starts.
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 and FM
de-energize and the 5-min. ice purge timer begins. When the 5-min. ice purge timer
terminates, GM and CCR 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.
12) Shutdown
Bin fills with ice activating BC proximity switch. CB starts 90-sec. Comp shutdown
timer. Once 90-sec. Comp shutdown timer terminates, Comp and FM de-energize and
60-sec. GM shutdown timer starts. Once 60-sec. GM shutdown timer terminates, GM
de-energizes and icemaker is off.
Shutdown Diagnosis: Check that BC actuatour paddle is activated and not sticking.
Check BC proximity switch continuity. When BC actuator paddle is down (icemaking),
BC proximity switch is closed. When BC actuator paddle is up BC proximity switch is
open. If not, replace BC proximity switch. If BC proximity switch is open and Comp, FM,
and GM do not de-energize, replace CB. See "II.C. Control Board Check Procedure."
Legend: BC–bin control; CB–control board; CCR–compressor control relay;
Comp–compressor; DV–drain valve; FM–fan motor; GM–gear motor; LFS–lower
float switch; UFS–upper float switch; WV–inlet water valve
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