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17
II. Sequence of Operation and Service Diagnosis
A. Sequence of Operation Flow Chart
1. Icemaking and Drain Cycle
1-in-1 drain cycle. DV opens for 2 sec. every hour
(CB S1 Dip Switch 4).
Icemaker status does not change.
Control Board Sequence of Operation Flow Chart - Icemaking and Drain Cycle
LFS closed
UFS closed
FZT starts
FT terminated
WV de-energized
3. 1-in-12 Drain Cycle
& Restart (optional)
UFS open
LFS open (WV on)
FT starts (90 sec.)
FZT terminated
WV energized
Comp continues
GM continues
FM continues
FMR continues
LLV continues
SLV continues
1. Startup
2. Ice Purge Cycle
WV energized
Comp energized
LLV energized
SLV energized
GM continues
FM continues
FMR continues
2. 1-in-1 Drain Cycle
Comp de-energized
LLV de-energized
SLV de-energized
GM continues
FM continues
FMR continues
1. Fill Cycle
3. Freeze Cycle
LFS closed
UFS closed
FZT starts (30
min.)
FT terminated
WV de-energized
Comp continues
GM continues
FM continues
FMR continues
LLV continues
SLV continues
Low Water Safety
Purge Timer
UFS open
WV energized
Comp de-energized
LLV de-energized
SLV de-energized
GM continues
FM continues
FMR continues
DV energized
GM de-energized
FM de-energized
FMR de-energized
10-min. DT terminated
DV de-energized
1-in-12 DT reset
5 min.
4. Icemaker Restart
2. Ice Purge Cycle
3. 10-Min. Drain
If Fill > 90 sec. FT
1-beep alarm sounds
WV continues
When UFS closes
alarm resets and
2. Ice Purge Cycle starts.
FT Maximum
90 sec.
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 Hour Drain Cycle & Restart (optional)."
Re๎ll
FT Maximum
90 sec.
90 sec. FT exceeded,
90 sec. PT starts and
1-beep alarm sounds
90. sec. PT terminates
unit shuts down and
1-beep alarm continues.
When UFS closes, alarm
resets and 2. Ice Purge
Cycle starts.
WV continues
GM de-energized
FM de-energized
FMR de-energized
1. DT Initiates DC
To bypass, press the
"SERVICE" button after
GM starts.
5 min.
to "1. Fill Cycle" above
90 sec.
(CB S1 dip switch 4 "ON")
FT off (90 sec.)
5 or 30 sec.
(S1 Dip Switch 7)
EH energized
GM energized
FM energized
FMR energized
1. DT Initiates DC
Continued uninterrupted
operation
DV energizes for 2 sec.
2. Continued Operation
DV de-energizes, no
interruption in ice production
30-min. FZT
Startup
FZT exceeded (LFS does not
open): CB shuts down icemaker
and sounds a 5-beep alarm.
Legend:
BC-bin control (mechanical stand-alone)
BC1-bin control 1 (infrared sensor)
BC2-bin control 2 (mechanical backup)
CB-control board
Comp-compressor
DC-drain cycle
DT-drain timer
DV-drain valve
EH-evaporator heater
FM-fan motor
FMR-fan motor-remote
FT-๎ll timer (low water safety)
FZT-freeze timer
GM-gear motor
LFS-lower ๎oat switch
LLV-liquid line valve (MLH)
PT-purge timer
SLV-suction line valve (MLH)
UFS-upper ๎oat switch
WV-inlet water valve
Low Water Safety
Shutdown
(CB S1 dip switch 4 "OFF")
Normal Operation
Power Switch "ON"
Control Switch in "ICE"
POWER OK LED on
BC1 Green LED on
BC1 Yellow LED off
BC(2) Closed
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