Service Manual

9
PM off
Delay *4
WV 20 sec.
Delay *1
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
CBT–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
Control Board
1. 30-Sec.
Startup
Cycle
Cycle
Steps
2. Harvest Cycle
• HGV: If CBT≤32°F (0°C) (CB Setting 74),
HGV repeatedly energizes 40sec./de-
energizes 40 sec.
• FM: If CBT≥118°F (48°C) (CB Setting 34),
FM operates continuously in harvest cycle
• Max. harvest time: 30 min.
3. Freeze Cycle
• Max. freeze time: 50 min. (CB Setting 6)
HGV energized
HGV continues
AMD energized
Comp energized
Startup
Comp continues
AMU energized
FM energized
HGV de-energized
Water Tank Open (ET)
ET≥41°F (5°C)
(CB Setting 1)
AM fully open
PM energized
WV de-energized
Comp continues
FM continues
WV energized *4 + *5
Water Tank Closed
(AMPS)
If CBT>32°F (0°C)
(CB Setting 74) and
CBT≤111°F (44°C)
(CB Setting 70),
HGV energizes 10sec./
de-energizes 20 sec./energizes
10 sec. (CB Setting 71, 72)
ET≤-8.5°F (-22.5°C)
(CB Setting 2)
Note
CB
Setting
Initial Harvest and
Initial Freeze after
Power On
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)
98 sec.
10 sec. 98 sec. 24 sec. 98 sec.
11 WT > 48°F (9°C)
24 sec.
24 sec. 98 sec. 24 sec. 98 sec.
*3 NA 10 sec. 0 sec. 10 sec. 0 sec. 10 sec.
PD*4 12 37 sec. × 2 37 sec. × 2 37 sec. × 2 37 sec. 37 sec.
PD*5 15 0 sec. 0 sec. 0 sec. 0 sec. 0 sec.
FD*4 12 74 sec. 74 sec. 74 sec. 74 sec. 74 sec.
FD*5 15 0 sec. 0 sec. 0 sec. 0 sec. 0 sec.
Time varies based on
control board calculation
(0 to 60 sec.)
FD–full drain (CB Setting 14)
FM–fan motor
HGV–hot gas valve
PD–partial drain (CB Setting 14)
PM–pump motor
WPA–water pan assembly
WT–water temperature
WV–inlet water valve
Icemaker restarts at
1.30-Sec. Startup Cycle.
24 sec.
WV energized *2
WV de-energized