Service Manual

8
II. Sequence of Operation and Service Diagnosis
A. Sequence of Operation Flow Chart
"F-A" & "F-C" Control Board Sequence Flow Chart
DCM-270B_H(-OS)
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" "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 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.
*1-min. or 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 large balance plate 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 large balance plate disengaged)
A. "F-A" E-0 (G) and
Earlier Dip Switch 8 "ON"
B. "F-A" E-0 (H) and Later
Dip Switch 8 "OFF"
C. "F-C" Dip Switch
8 and 9 "OFF"
to "2. Ice Purge Cycle" above if UFS closed. to "1. Fill Cycle" above if UFS open.
BC open (BC large balance plate engaged)
90 sec. 60 sec.
*"F-A" E-0 (G) and Earlier dip switch 8 on - 5 min. *"F-A" E-0 (H) and Later and "F-C" dip switch 8 off - 1 min. and a 2-second periodic agitation was added to occur every 90 min.