Service Manual

30
8) Drain Cycle – "FLUSH" (drain) LED is on: 12-hr. DCT terminates or CS is moved
to "DRAIN" position. 150-sec. shutdown sequence starts. 90 seconds later, Comp
de-energizes and Comp LED turns off. 60 seconds after Comp de-energizes, GM
de-energizes and GM LED turns off. Drain cycle starts. "FLUSH" LED turns on and DV
energizes. DV de-energizes after 20minutes when drain cycle is initiated by 12-hr. DCT.
When the drain cycle is initiated by CS (manual drain), DV de-energizes when CS is
moved to "OFF" position or "ICE" position.
Push Button Model: "FLUSH" (drain) LED is on. Conrm 24VAC at CB K2 connector
pin #8 (LBU wire) (12-hr. DCT) to CB K4 connector pin #2 (LBU wire). If 24VAC is not
present, conrm 24VAC at CB K2 connector pin #7 (R wire) to CB K4 connector pin
#2 (LBU wire). If 24VAC is present on CB K4 connector pin #7 (R wire) and not on pin
#8(LBU wire), replace CB. If 24VAC is present, DV energizes and allows water from the
evaporator and reservoir to drain for 20 minutes.
Opti-Serve Model: "FLUSH" (drain) LED is on. Conrm 24VAC at CB K2 connector
pin #10(LBU wire) (12-hr. DCT) to CB K4 connector pin #2 (LBU wire). If 24VAC is not
present and "FLUSH" LED is on (CS in the "ICE" position), replace CB. If 24VAC is
present, DV energizes and allows water from the evaporator and reservoir to drain for
20 minutes.
Manual Drain: Move CS to the "DRAIN" position. Conrm 24VAC at CB K3 connector
pin #3 (DBU wire) to CB K4 connector pin #2 (LBU wire). If 24VAC is not present,
replace CB. If 24VAC is present, check CS (LBU wire) to CB K4 connector pin
#2(LBUwire). If 24VAC is not present, replace CS. If 24VAC is present, DV energizes
and allows water from the evaporator and reservoir to drain.
9) Shutdown – When BC actuator paddle is activated, BC proximity switch opens, 5VDC
is interrupted at CB K4 connector pin #3 (GY wire) and #4 (V wire). 150-sec. shutdown
sequence starts. 90 seconds after BC opens, Comp de-energizes, 60seconds later,
GM de-energizes. If 5VDC is present from CB K4 connector pin #3 (GY wire) to CB
connector pin #4(Vwire), and Comp or GM does not de-energize, replace CB.
Legend: AM–agitating motor; BC–bin control; CB–control board; Comp–compressor;
CS–control switch; CT–control transformer; DCT–drain cycle timer (12-hr. timer);
DispWV–dispense water valve; DM–dispense motor; DMS–dispense mode switch
("CONTINUOUS," or "PORTION"); DS–dispense solenoid; DVT–drain valve timer
(20-min. timer); FM–fan motor; GM–gear motor; GMPR–gear motor protect relay;
LF/S–loweroatswitch;UF/S–upperoatswitch;WCR–water control relay;
WV–inlet water valve