Service Manual

12
II. Sequence of Operation and Service Diagnosis
A. Sequence of Operation Flow Chart
Sequence Flow Chart
Control Boards: 2A4296-01, 2A8054-01 and 2A9093-01
DCM-300BAH(-OS) F-1 and Later
DCM-500B_H(-OS) H-0 and Later
DCM-75_B_H(-OS) A-0 and Later
1-in-1 drain cycle. DV energizes for 2 seconds every hour (S1 Dip Switch 4). Does not affect operation.
GM energized
UFS open LFS open FT starts (90 sec.) WV energized Comp energized FM energized GM energized
1. Startup
2. Ice Purge Cycle
Comp energized FM energized GM energized
Power Switch "ON" Control Switch in "ICE" CB "POWER OK" LED on
1. Fill Cycle
3. Freeze Cycle
LFS closed UFS closed FT terminates WV de-energized Comp energized FM energized GM energized
Low Water Safety
1-beep alarm sounds
PT starts UFS open Comp de-energized FM de-energized WV energized GM energized
Legend: BC-bin control CB-control board Comp-compressor DC-drain cycle DT-drain timer
DV-drain valve FM-fan motor FT-ll timer (low water safety) GM-gear motor LFS-lower oat switch PT-purge timer UFS-upper oat switch WV-inlet water valve
4. 1-in-12 Drain Cycle - The factory default is 1-in-1 drain cycle. IMPORTANT! Do not adjust for 1-in-12 drain cycle sequence on this model.
Rell
Maximum 90 seconds
90 sec. FT exceeded
1-beep alarm sounds 90 sec. PT starts
When UFS closes, alarm resets and 2. Ice Purge Cycle starts.
1-beep alarm continues WV energized GM de-energized
90 seconds
FT
exceeded
PT
terminates
To bypass, press the "SERVICE" button after GM starts.
5-min.
5 sec.
Maximum 90 seconds
LFS closed UFS closed FT terminates WV de-energized
WV energized FT starts (90 sec.)
If Fill > 90 sec. FT 1-beep alarm sounds WV energized When UFS closes alarm resets and 2. Ice Purge Cycle starts.
to "2. Ice Purge Cycle" above if UFS closed. To "1. Fill Cycle" above if UFS open.
1. Bin Full
GM energized Comp de-energized FM de-energized
GM de-energized
3. Icemaker Off
BC open Comp energized FM energized GM energized
2. Ice Purge Cycle
4. Icemaker Restart
150-sec. Shutdown Sequence
BC closed
BC open (BC actuator paddle engaged)
2. Icemaker Off
2. Bin Control
Shutdown & Restart
1. Bin Full
3. Icemaker Restart
All Components de-energized
Ice level lowered
6 to 10 sec.
BC closed (BC actuator paddle disengaged)
A. 2A4296-01: 6 to 10 sec. Shutdown
DCM-751B_H(-OS) only
E-0 and Earlier Dip Switch 8 "ON" Dip Switch 9 "ON" or "OFF"
B. 2A8054-01 and 2A9093-01: 90/60 sec. Shutdown Dip Switch 8 "ON" and Dip Switch 9 "ON" DCM-751B_H(-OS) F-0 and later DCM-300/500B_H(-OS) all
to "2. Ice Purge Cycle" above if UFS closed. to "1. Fill Cycle" above if UFS open.
BC open (BC actuator paddle engaged)
90 sec. 60 sec.