Ice Cube Production - Electrolux 5995502399 Service Manual

Ice Cube Production

When the temperature of the ice mold goes below 28°F and the bail arm is in the down position, the ice mold heater
will turn on and the EEV will close as long as the unit is not in Freezer Recovery or Sabbath modes, or the 20
minute delay after defrost or POR. The heater will run until the mold reaches 34°F. Then the motor will move the ice
mold from the left hand freeze position around the fingers of the evaporator to the right hand fill position. At this point
the electronic control will wait for 45 seconds to allow the compressor to continue to pull the remaining
refrigerant from the finger evaporator. Then the control will provide power to the finger heater for 2-1/2 minutes, this
will allow the cubes to slide off the fingers. The harvest heater Bi-metal should open prior to the 2-1/2 minutes, but
the system will continue to provide power to the open circuit for the entire time. The control will go through several
short internal tests for about 10 seconds. Then the mold will pull away from the fill position and then move back.
This is to verify that the fill position switch is working properly. Now the ice mold will fill with water. The fill time is
4 seconds and will supply approximately 75 cc. of water. The control will now hold the ice mold for an additional 5
seconds to allow all water drops to enter the mold. Next, the drive motor will come on and move the ice mold back
under the evaporator fingers. The motor will shut off, and the EEV will open, allowing for refrigerant flow through the
fingers to start the water freezing process over again.
If the fill switch on the right side does not make connection when the ice mold moves from the freeze position on the
left, to the fill position on the right, the mold heater will come back on for five minutes to melt any ice that may be
obstructing the ice mold. The mold will then attempt to move to the right again. If the switch still cannot be reached,
the IM (Ice Maker) will repeat this process up to five times. If the switch cannot be reached after five tries, the IM will
stop trying for thirty minutes. After thirty minutes, it will try five times again. If the switch still cannot be reached after
the second series of attempts, then the IM will stop trying and change over to its minimum energy usage mode to cool
the compartment and keep any existing ice frozen. The IM will wait in this condition until the next system defrost has
completed, at which point it will repeat the process of trying to reach the fill switch.
If the freeze switch on the left side does not make connection when the ice mold moves from the right fill position to
the left freeze position, the IM will execute the same process as above except it will turn on both the mold and the
finger evaporator heaters.
Ice Maker (Fresh Food Compartment)
Ice Maker Evaporator
Ice Maker Chamber
Evaporator
Suction Line
Variable
Compressor
Figure 4-5. Ice Maker Refrigeration Flow Schematic
Heat Exchanger
Electric
Expansion Valve
Capillary Tube
Unit Evaporator
Accumulator
Evaporator
Pressure
Tee-Valve
Regulator
Drier
Condenser
4-3