Service Manual

8
II. Sequence of Operation and Service Diagnosis
A. Sequence of Operation Flow Chart
Legend:
AMD–actuator motor down
AMPS–actuator motor position sensor
AMU–actuator motor up
BC–bin control
CBTh–control board thermistor
Comp–compressor
ET–evaporator thermistor
1. Bin Full
Shutdown
and Restart
BC Operation
BC open 10 sec. or more (BC actuator
paddle engaged). Shutdown occurs at
end of harvest cycle.
All components
de-energized.
2. Icemaker Off
3. Ice Level Lowered
BC closed 80 sec. or more
(BC actuator paddle
disengaged).
Shutdown and Restart Sequence Flow Chart
Operation Flow Chart
1. 30-Sec.
Startup
Cycle
Cycle
Steps
2. Harvest Cycle
• HGV: If CBTh≤81°F (27°C) (CB Setting 74),
HGV repeatedly energizes 40sec./
de-energizes 40 sec.
• FM: If CBTh≥118°F (48°C) (CB Setting 34),
FM operates continuously in harvest cycle
• Max. harvest time: 30 min.
3. Freeze Cycle
• Max. freeze time: 45 min. (CB Setting 6)
HGV energized
HGV continues
AMD energized
Comp energized
Startup
WV energized *2
Comp continues
AMU energized
FM energized
HGV de-energized
Water Tank Open (ET)
ET≥41°F (5°C)
(CB Setting 1)
PM energized
Comp continues
FM continues
WV energized *4+*5
Water Tank Closed (AMPS)
If CBTh>81°F (27°C) (CB
Setting 74) and CBTh≤111°F
(44°C) (CB Setting 70),
HGV energizes 5sec./
de-energizes 25 sec./energizes
5 sec. (CB Setting 71, 72)
ET≤-1.3°F (-18.5°C)
(CB Setting 2)
Note
CB
Setting
Power On-Startup
Initial Harvest and
Initial Freeze
Bin Control-Startup
Initial Harvest and Initial Freeze after
Bin Control Initiated Restart
Normal Harvest and Freeze
All WT WT>48°F (9°C) WT≤48°F (9°C) WT>48°F (9°C) WT≤48°F (9°C)
*1 NA 20 sec. 0 sec. 0 sec. 20 sec. 20 sec.
*2 10
WT < 48°F (9°C)
95 sec.
10 sec. (CB Setting NA) 95 sec. 30 sec. 95 sec.
11
WT > 48°F (9°C)
30 sec.
*3 NA 0 sec. 0 sec. 10 sec. 0 sec. 10 sec.
PD*4 12
30 sec. × 2 30 sec. × 2 30 sec. × 2
30 sec. 30 sec.
PD*5 15
22 sec. × 2 22 sec. × 2 22 sec. × 2
22 sec. 22 sec.
FD*4 12 60 sec. 60 sec. 60 sec. 60 sec. 60 sec.
FD*5 15 44 sec. 44 sec. 44 sec. 44 sec. 44 sec.
Time varies based on
control board calculation
FD–full drain (CB Setting 14)
FM–fan motor
HGV–hot gas valve
PD–partial drain (CB Setting 14)
PM–pump motor
WT–water temperature
WV–inlet water valve
Icemaker restarts at
1.30-Sec. Startup Cycle.
WV de-energized
WV de-energized
30 sec.
*1
WV 20 sec.
Delay
PM off
Delay *4