Service Manual

12
II. Sequence of Operation and Service Diagnosis
A. Sequence of Operation Flow Chart
BC open (BC actuator paddle engaged)
"F-A" Control Board Sequence Flow Chart
DCM-751B_H(-OS)
1-in-1 drain cycle. DV energizes for 2 seconds every hour (S1 Dip Switch 4). Does not affect operation.
GM energized GMPR energized
3. 1-in-12 Drain Cycle
&Restart(optional)
2. Icemaker Off
UFS open LFS open FT starts (90 sec.) WV energized Comp energized FM energized GM energized GMPR energized
1. Startup
2. Ice Purge Cycle
Comp energized FM energized GM energized GMPR energized
Power Switch "ON" Control Switch in "ICE" Safety Switch closed "POWER OK" LED on
2. Bin Control
Shutdown & Restart
1. Bin Full
Comp de-energized FM de-energized GM energized GMPR energized
1. Fill Cycle
3. Freeze Cycle
LFS closed UFS closed FT terminates WV de-energized Comp energized FM energized GM energized GMPR energized
Low Water Safety
1-beep alarm sounds PT starts UFS open WV energized Comp de-energized FM de-energized GM energized GMPR energized
DV energized GM de-energized GMPR de-energized
10-min. DT terminates DV de-energized 1-in-12 DT reset
3. Icemaker Restart
5 minutes
4. Icemaker Restart
2. Ice Purge Cycle
3. 10-Minute Drain
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 GMPR-gear motor protect relay LFS-lower oat switch PT-purge timer UFS-upper oat switch WV-inlet water valve
4. 1-in-12 Drain Cycle - Although the factory default 1-in-1 drain cycle is recommended, a 1-in-12 drain cycle is available. For 1-in-12 drain cycle sequence, see "3. 1-in-12 Drain Cycle & Restart (optional)."
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 GMPR de-energized
1. DT Initiates DC
to "1. Fill Cycle" above
90 seconds
(S1 dip switch 4)
FT
exceeded
PT
terminates
To bypass, press the "SERVICE" button after GM starts.
5 minutes 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.
All Components de-energized
to "2. Ice Purge Cycle" above
Ice level lowered
6 to 10 sec.
BC closed (BC actuator paddle disengaged)