©2003Maytag Appliances Company
16022217 Rev. 0
7
Operation. Selector switch is in the ON
position.
The assumptions before proceeding are that water is
supplied to the ice maker, there is proper electrical
power to the ice maker, and the drain is properly
plumbed or the drain pump is operating properly.
Input power must be applied at all times for proper
operation. Any interrupt will lockout the compressor for
up to 9 minutes and restart the mode of operation.
Below is the timing diagram/operation for the electronic
control.
Upon setting the switch to the ON position, the water
solenoid will energize for 1.5 minutes and then de-
energize. When the bin thermistor senses temperature at
or above the start ice setpoint, and the evaporator
thermistor senses temperature at or above the
production setpoint, the production cycle will begin. The
circulation pump, condenser fan, and compressor relay
will energize. When the evaporator thermistor senses
temperature at or below the harvest setpoint, the
harvest cycle will begin. The circulation pump and
condenser fan outputs will be de-energized and the hot
gas solenoid and the drain solenoid will energize. The
drain solenoid will remain energized for 45 seconds and
then de-energize, after which the water solenoid will
energize for 2.0 minutes and then de-energize. Loads
will remain in this state until the evaporator thermistor
temperature rises to the production setpoint. Once the
evaporator thermistor temperature is at or above the
production setpoint, a new production cycle will begin. If
at any time the bin thermistor senses a temperature at or
below the stop ice setpoint, any production or harvest
cycle in process will continue until the harvest cycle is
complete. Once complete, all loads will de-energize and
remain so until the bin thermistor senses a temperature
at or above the start production setpoint. A new
production cycle will then begin. During the first
production cycle only (the switch was previously in the
OFF or CLEAN position), the evaporator thermistor
temperature will be ignored until the circulation pump has
run for 2 minutes. During all harvest cycles, the
evaporator thermistor temperature cannot terminate the
harvest cycle until the water solenoid is de-energized.
The grid cutter output will always be energized during the
harvest cycle, and for the first 35 minutes into the
production cycle.
If during any production cycle or harvest cycle, the
selector switch is put into the CLEAN position, any
cycle in process will be immediately terminated and a
clean cycle will occur. The unit will now repeat the entire
above cycle.
Operation Instructions
If during any production or harvest cycle, the selector
switch is put into the OFF position, the cycle in process
will be stopped and all loads will de-energize and remain
so as long as the selector switch remains in the OFF
position.
If during any production or harvest cycle, the selector
switch is taken out of the ON position, a lockout will be
started during which the compressor relay will not re-
energize regardless of switch position.
If during any production or harvest cycle, there is a
power loss/interruption of greater than 25 milliseconds,
a lockout delay will begin and the compressor relay will
not re-energize upon re-application of power until the
lockout delay is complete. The lockout delay begins with
the loss of power and is unaffected by duration of power
loss. All other loads will operate normally during the
lockout.
The setpoints are as follows:
Stop ice: 35.0 deg. F +/- 2 deg. F
Start ice: 43.0 deg. F +/- 2 deg. F
Harvest: 11.0 deg. F +/- 2 deg. F
Production: 45.0 deg. F +/- 2 deg. F
Setpoint vs Temperarure and voltage (120VAC): +/- 3
deg. F
Operation. Selector switch is in the Clean
position.
The assumptions before proceeding are that water is
supplied to the icemaker, there is proper electrical power
to the icemaker, and drain is properly plumbed or the
drain pump is operating properly.
Refer to timing/operation diagram. Upon setting the
selector switch to the CLEAN position during the
production or harvest cycle, the water solenoid will
energize and all other loads will be de-energized. The
following sequence will now occur:
1.
After 3.0 minutes the water solenoid will de-
energize and the circulation pump will energize.
2.
After 30 minutes the circulation pump will de-
energize and the drain solenoid will energize.
3.
After 75 seconds the drain solenoid will de-
energize and the water solenoid will energize.
4.
After 3.0 minutes the water solenoid will de-
energize and the circulation pump will energize.
5.
After 10 minutes the circulation pump will de-
energize and the drain valve will energize.
6.
After 75 seconds the drain solenoid will de-
energize. The clean cycle is now complete.
All loads will remain off as long as the selector switch
remains in the "Clean" position and the power is not
removed and reapplied.
