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Water & Ice System
Select models of the refrigerator come equipped with a
optional Modular Ice Maker and Water Valve. Models with
the water valve may also have the Modular Ice Maker added
at a later time.
Water Supply
Water is supplied to the Modular Ice Maker through the Water
Valve. The Water Valve is powered by 120 VAC. Power to
the Water Valve is supplied by timing circuitry internal to the
Modular Ice Maker.
Modular Ice Maker
The Modular Ice Maker is powered by 120 VAC. The power
is supplied directly from the power cord, via a splice in the
transition grommet in the Machine Compartment.
The Modular Ice Maker contains a timer which controls
operation of the Ice Maker Fill, Timing, and Harvest cycles.
See the Tech Sheet included with the Ice Maker for further
information.
DEFROST SYSTEM
The defrost system is designed to remove ice build-up from
the Freezer Compartment (FC) evaporator. FC defrost is
accomplished using an 120 VAC Heater
An Adaptive Defrost Control (ADC) routine determines when a
defrost cycle is needed. ADC monitors Compressor operation,
and door openings as the primary inputs.
Normal Operation
During defrost, 120 VAC power is applied to the heater from
Control Board connector CN1-5. The FC Evaporator Thermistor
monitors the temperature during defrost. When the FC
Evaporator Thermistor reads 41°F (5°C), or after 25 minutes,
whichever comes first. Defrost is ended by removing the 120
VAC power from Control Board connector CN1-5.
Backup Operation
There is a thermal fuses wired in series with the defrost
heater. The thermal fuse is designed to interrupt the defrost
cycle if the normal method does not function properly. The
thermal fuses open at 183°F (84°C), interrupting power to the
heater.
For Service Technician Use Only
LIGHTING SYSTEM
The Lighting System provides light for the Refrigerator
Compartment (RC), and on some models, the Freezer
Compartment (FC).
RC Lighting
The RC has a socket for a single standard incandescent type
bulb. The bulb is supplied with a constant 120 VAC and is
in series with a normally open switch. When the RC door is
opened, the door switch closes, turning on the light.
FC Lighting
Select models contain an FC light which operates identically to
the RC lighting described previously.
18.2 Cu Ft Top Mount Refrigerator
THEORY OF OPERATION
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