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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)."
Rell
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)