Operation - Frigidaire LGUB2642LF2 Service Manual

Ice Maker (Finger Evaporator Fresh Food Compartment)
Depending on the Engineering Digit at the end of
the model number, the product may be equipped with
a Flex Tray or a Finger Evaporator ice maker in the
fresh food compartment. Models without the dispenser
will have an aluminum mold ice maker mounted in the
freezer compartment. Select models will be equipped
with ice makers in both the fresh food and the freezer
compartments.
Fresh Food Ice Maker Operation
(Dispenser Models Only)
The french door bottom freezer refrigerator has an ice
and water dispenser mounted in the left fresh food door
and an ice maker mounted in the top left corner of the
fresh food compartment. The ice maker is controlled by
a electronic control board mounted in the top left side
of the back panel. This control oversees the complete
operation of the ice maker.
The ice maker has its own evaporator for freezing ice
in the ice mold and removing heat from the ice maker
compartment. The evaporator assembly consists of an
electronic control valve, a finger section to freeze ice in
the ice mold, and a fin and tube section to remove heat
from the ice maker compartment. (See Figure 4-9)
The ice maker has its own internal heat exchanger with
the cap tube coming from the machine compartment to
the ice maker. A suction line goes from the ice maker
through the cabinet, to a pressure regulator mounted
in the freezer compartment to the left of the freezer
evaporator.
Heater
Mold Heater
Finger Heater
Defrost Heater
Jumper Tube Heater
* Heater Manufacturers ratings
Noe that there is a+5%/-10% tolerance on the
wattages from the manufacturers.
Figure 4-8. Heater Electrical Specifications
Ohms Watts @ Watts @
115v 120v
96 138 150*
88 150* 164
378 35* 38
2798 5 6
The ice maker has a drive motor, two position switches
for the ice mold, and a bail arm switch mounted in the
top front. In the center section is the ice mold, which
will move from the fill position on the right to the freeze
position on the left after the mold is filled with water.
In the freeze position, the fingers from the ice mold
section of the evaporator will extend into the water in the
center of each ice cube position of the ice mold. The ice
mold has a 150 Watt heater attached. (See Figure 4-8)
An NTC (Negative Temperature Coefficient) thermistor is
attached to the ice mold to start the harvest cycle when
the ice mold has reached 28°F. The heater will heat
the mold until the thermistor indicates that the mold
temperature reached 34°F. At this point, the controller
will shut off the heater, pull the mold away from the
cubes and move it to the fill position. Also connected to
the mold are a thermostat and a thermo-fuse as safety
devices. The thermostat will shut off the heater if the
mold reaches 170°F and the thermo-fuse will open if the
mold temperature reaches 220°F. The center section
also contains the fill spout for water entering the ice
maker when ice mold is on the right side. (Water fill
position)
EEV
Valve
Hot
Cap Tube
Tube
Ice Maker
Evaporator
Filter Drie r
Condenser
Figure 4-9. Ice Maker Refrigeration Schematic
4-9
Accumulator
Evaporator
Ice Maker
Freezer
Evaporator
Cap Tube
Freezer
Evaporator
Compressor