Service Manual

9
II. Sequence of Operation and Service Diagnosis
A. Sequence of Operation Flow Chart
Legend:
AMD–actuator motor down
AMU–actuator motor up
AT–ambient temperature
BC–bin control
CBT–control board thermistor
Comp–compressor
ET–evaporator thermistor
FM–fan motor
HGV–hot gas valve
PM–pump motor
PS–position sensor
WT–water temperature
W
V
–
inlet water valve
2. Harvest Cycle
• Max. harvest time: 30 min.
3. Freeze Cycle
• Max. freeze time: 60 min. (CB Setting 6)
ET≤-4.9°F (-20.5°C)
(CB Setting 2)
Comp energized
FM
energized
WV energized (*1)
PM energized
HGV energized (*1)
Comp energized
AMU energized
FM energized
WV energized
HGV energized
Water Tank Closed
(Actuator Motor PS)
Comp energized
AMD energized
FM
energized
WV energized
PM energized
HGV de-energized
HGV energized
Startu
p
1. 30-Sec.
Startup
Cycle
Cycle
Steps
ET≥50°F (10°C)
(CB Setting 1)
Comp
energized
FM
de-energized
WV
de-energized
HGV energized
Comp energized
FM
energized
WV de-energized
PM energized
HGV de-energized
CB Setting 15 (*1)
[1] Ice formed on evaporator
When both water plate switch and cam switch turn on, AMD stops opening water tank on the way and
Comp
de-energizes
at the same time (for 5 min.).
WV stays energized to melt water tank bottom. FM is energized and HGV and PM are de-energized.
When either water plate switch or cam switch turns off, WV de-energizes and AMD starts opening water tank
fully.
[2] No ice formed on evaporator or ice formed on evaporator and high AT
Either water plate switch or cam switch turns off. AMD does not stop opening water tank and
Comp stays
energized
.
[3] Water tank opening by WT
WT≥55.4°F (13°C): Water tank starts opening again after 1 min.
WT<55.4°F (13°C): Water tank starts opening again after 5 min. WT is lower than 55.4°F (13°C) in initial cycle
after startup.
If water plate switch turns off within 1 or 5 min., water tank starts opening again.
[4] Harvest cycle with water tank open
1) When water tank opens and actuator motor PS indicates water tank is fully open, HGV energizes.
When 5 min. have passed after Comp de-energizes and actuator motor PS indicates water tank is fully open,
Comp energizes at the same time as above.
2) In [3], Comp stays energized. When actuator motor PS indicates water tank is fully closed, HGV energizes.
Water Tank Opens
AMD energized or de-energized
Comp energized or de-energized
FM
energized
WV energized
PM de-energized
HGV de-energized
WT
≥
55.4°F (13°C)
or
WT<55.4°F (13°C)
[1] [3]
[2]
Water Tank
Opens Again
Water Tank Stops
Opening
Water Tank Opened [4]
(Actuator Motor PS)
Shutdown
and Restart
BC Operation
1. Bin Full
BC open 10 sec. or
more (BC actuator
paddle engaged).
Shutdown occurs at
end of harvest cycle.
All components
de-energized.
BC closed 80 sec. or more
(BC actuator paddle
disengaged).
Icemaker restarts at
1. 30-Sec. Startup Cycle.
3. Ice Level Lowered 2. Icemaker Of
f
Shutdown and Restart Se
q
uence Flow Chart