Service Manual

8
II. Sequence of Operation and Service Diagnosis
A. Sequence of Operation Flow Chart
Sequence Flow Chart
DCM-271B_H(-OS)
1-in-1 drain cycle. DV energizes for 2 seconds every hour (S1 Dip Switch 4). Does not affect operation.
GM energized FM energized
UFS open LFS open FT starts (90 sec.) FZT terminated 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" "POWER OK" LED on
1. Fill Cycle
3. Freeze Cycle
LFS closed UFS closed FZT starts (30 min.) FT terminated WV de-energized Comp energized FM energized GM energized
Low Water Safety Purge Timer
1-beep alarm sounds PT starts UFS open Comp de-energized FM energized GM energized WV energized
Legend: BC-bin control Comp-compressor DC-drain cycle DT-drain timer DV-drain valve FM-fan motor FT-ll timer (low water safety) FZT-freeze timer 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 90 sec. PT starts and 1-beep alarm sounds
Low Water Safety Shutdown 90 sec. PT terminates appliance shuts down and 1-beep alarm continues. When UFS closes, alarm resets and 2. Ice Purge Cycle starts.
1-beep alarm continues WV energized FM de-energized GM de-energized
90 seconds
FT
exceeded
PT
terminates
To bypass, press the "SERVICE" button after GM starts.
1-min.
5 sec.
Maximum 90 seconds
LFS closed UFS closed FT terminates FZT starts 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
FM energized 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
2. Bin Control
Shutdown & Restart
BC open (BC large balance plate engaged)
90 sec. 60 sec.