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II. Sequence of Operation and Service Diagnosis
A. Sequence of Operation Flow Chart
1. "E" and "G" Control Board without Harvest Pump Timer Operation
Components Energized when the Control Switch is in the "WASH" Position
The "WASH" position on the control switch is used when cleaning and sanitizing the icemaker. When in the "WASH"
position, power is supplied to the pump motor. With the cleaning valve closed, the cleaner and sanitizer ow over the
outside of the evaporator plate assembly. With the cleaning valve open, the cleaner and sanitizer ow over both the
outside and the inside of the evaporator plate assembly.
Note: Close the cleaning valve after cleaning and sanitizing are complete, otherwise the icemaker will not restart
when the control switch is placed in the "ICE" position.
Legend:
BC–bin control
Comp–compressor
FM–fan motor
FMR–fan motor-remote
FS–oat switch
HGV–hot gas valve
LLV–liquid line valve
PM–pump motor
WV–inlet water valve
• Max. WV time: 6 min.
• Max. harvest time: 20 min.
FS check
1 to 3-min. harvest
timer in control
(S4 dip switch 1 & 2)
"E" and "G" Control Board without Harvest Pump Timer Operation Flow Chart
1. 1-Minute
Fill Cycle
Cycle
Steps
2. Harvest Cycle
Thermistor
in control
3. Freeze Cycle
• Min. freeze time: 5 min.
• Max. freeze time: freeze timer
setting
(S4 dip switch 9 & 10)
FS in control
4. Pump-Out Cycle
• Factory set for every
10th cycle
(S4 dip switch 5 & 6)
• Pump motor stops for
2 sec., then reverses
for 10/20 sec. (S4 dip
switch 3 & 4)
WV energized
FS open
Comp energized
FMR energized
HGV energized
WV energized
Thermistor temperature
reaches 48°F (9°C)
(3.9kΩ or less). Harvest
timer starts (1 to 3 min.).
FS open
Comp continues
FMR continues
FM energized
LLV energized
PM energized
HGV de-energized
WV de-energized
FS closed
Comp continues
FMR continues
HGV energized
PM de-energizes for 2 sec.,
then reverses for 10/20 sec.
FM de-energized
LLV de-energized
FS check
Startup
If FS is open, Comp stops and cycle returns to 1-min. ll.
5-min. timer in
control
FS closed
FS opens or
freeze timer
terminates
1. Bin Full
Within 10 sec. after ice contacts BC bulb,
icemaker shuts down.
Shutdown
and Restart
BC
Operation
Ice contacts BC bulb
2. Icemaker Off
All components
de-energized.
3. Ice Level Lowered
No ice touching BC bulb.
Icemaker starts at
"1. 1-Minute Fill Cycle."
BC closed
BC open
All components
de-energized
To 1. 1-Minute Fill Cycle
NOTE: "G" control board
green "BC CLOSED" LED
on continuously when the K4 jumper is in place.