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10) Drain Cycle
a) 1-n-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, and
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 de-energizes. GM and FM continue. The 5-min. ice purge
timer starts. When the 5-min. ice purge timer terminates, GM and FM 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 de-energizes and
the 5-min. ice purge timer begins. When the 5-min. ice purge timer terminates, GM and
FM 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.
Diagnosis DV: If DV does not energize, check for 24VAC at CB K2 #10 (W/DBU) to
neutral (LBU). If 24VAC is not present, check control switch continuity. If open while in
the "DRAIN" position, replace control switch. If closed, check for 0VDC at control board
K9 #1 (W/BK) to K9 #2 (W/BK). If 5VDC is present and control switch is closed, replace
CB. If 24VAC is present, check for restricted DV and DV solenoid continuity. Clean or
replace as needed.
11) Shutdown
Bin fills with ice activating BC. CB starts 90-sec. Comp shutdown timer. Once 90-sec.
Comp shutdown timer terminates, Comp de-energizes and 60-sec. GM shutdown timer
starts. Once 60-sec. GM shutdown timer terminates, FM and GM de-energize and
icemaker is off.
Shutdown Diagnosis: Check that BC large balance plate is activated and not sticking.
Check BC micro-switch continuity. When BC large balance plate is down (icemaking),
BC micro-switch is closed. When BC large balance plate is up BC micro-switch is open.
If not, replace BC micro-switch. If BC micro-switch is open and Comp, FM, and GM do
not de-energize, replace CB. See "II.C. Control Board Check."
Legend: BC–bin control; CB–control board; CCR–compressor control relay;
Comp–compressor; CT–control transformer; 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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