Service Manual

20
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 and PDS 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, PDS de-energizes, GM continues. The 5-min. ice purge timer
starts. When the 5-min. ice purge timer terminates, GM de-energizes. 10-min. DT starts,
DV energizes. After 10-min. DT terminates, DV de-energizes and 12-hour drain cycle
timer starts. Icemaking cycle 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 PDS de-energizes and
the 5-min. ice purge timer starts. When the 5-min. ice purge timer terminates, GM
de-energizes. 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 – BC (infrared sensor): When ice activates BC, yellow LED starts ashing
when ice is at the outer limit of its range and turns steady as ice nears. After BC
yellow LED turns on (ashing or steady), BC 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. BC (Infrared Sensor) Shutdown Delay (S1 dip
switch 1, 2, 3)." Once BC shutdown delay timer terminates, PDS de-energizes and the
5-min. ice purge timer starts. Unit is in pump-down mode. When the refrigerant low-side
pressure drops to 9PSIG, CLPS opens, MC de-energizes, de-energizing Comp and
FMR. CCH energizes. When the 5-min. ice purge timer terminates, GM, EH, CCR
de-energize. Icemaker Diagnosis: BC yellow LED not ashing or on with ice near.
See "II.D. Bin Control Check." PDS remains energized after BC shutdown delay timer
terminates. Check for 115VAC from CB X1 relay V wire to neutral (W). If 115VAC is
present, replace CB. If 115VAC is not present, check PDS for mechanical failure.
Condensing Unit Diagnosis: When PDS de-energizes and closes, pump-down starts.
Conrm refrigerant low-pressure drops to 9PSIG and CLPS opens. If refrigerant
low-pressure reaches 9 PSIG and CLPS does not open, replace CLPS. If Comp and
FMR remain energized after CLPS opens, replace MC.
Legend: BC–bin control (infrared sensor); CB–control board; CCH–crankcase heater;
CCR–compressor control relay; CLPS–control low-pressure switch;
Comp–compressor; DV–drain valve; EH–evaporator heater;
FMR–fan motor-remote; FT–90-sec. low water safety timer; FZT–30-min. freeze
safety timer; GM–gear motor; HM–headmaster (C.P.R.); HPS–high-pressure
switch; LFS–lower oat switch; MC–magnetic contactor; PDS–pump-down
solenoid valve; SLPS–safety low-pressure switch; UFS–upper oat switch;
WV–inlet water valve