80
Dometic
®
MANUAL
Refrigerators
SHUTOFF
SWITCH
LEVER
ARM
FRONT VIEW
MOTOR
MOUNTING
PLATE
TIMING CAM
WATER
VALVE
SWITCH
HOLDING
SWITCH
MOLD SWITCHES
These three switches are single-pole, double-throw
style. They are identical and interchangeable.
The holding switch assures completion of a revolution
once a cycle has started.
The water valve switch opens the water valve during
the fill stage of the cycle. NOTE: This is the only adjust-
able component of the ice maker. If you use a double-
throw switch, DO NOT use the N.O. terminal.
The shut-off switch stops the ice maker's operation
when the storage bin is full.
TIMING MOTOR
This is a low-wattage,
stall-type motor which is
geared to the timing
cam and ice ejector. It
is a one RPM motor.
To check the motor,
disconnect power to the
appliance and test for
continuity between the two leads. If you DO NOT have
continuity, replace the motor. If you have continuity and
the motor runs, DO NOT replace.
WATER VALVE
This valve is solenoid operated. When it is open, it
releases water from the source to the mold. The amount
of water is proportional to the length of time the water
valve switch is held closed by its timing cam.
Disconnect power to the appliance, remove the wires to
the valve solenoid coil, and check for continuity between
the two terminals. If you have continuity, the solenoid is
good. It takes 10-15 watts to energize the solenoid coil.
The mold heater and coil are in series. When the mold
heater is activated, this causes the voltage to drop to
about 105 VAC at the coil.
The valve has a flow washer inside which acts as a
pressure regulator. A strainer is installed to prevent
dirt, rust, etc. from entering the valve. Check for any
debris which might obstruct the flow of water, or
prevent the valve from closing completely when the
circuit is not energized. Remove any obstructions. If
the valve still fails to operate properly, replace it.
VALVE BODY
STRAINER
FLOW
WASHER
SOLENOID
COIL
WATER VALVE
ICE MAKER ASSEMBLY
It may be necessary to replace the entire ice maker
assembly. Follow replacement instructions supplied with
the new ice maker assembly.
3H.OPERATION
While the operation of the ice maker is fairly simple,
an understanding of its cycle is necessary for the service
technician to diagnose specific problems. The following
series of electrical schematics will show a typical cycle,
and the positions of various components during the
cycle: The mold and its contents, the ejector, the shutoff
arm and the storage bin.
NOTE: If you have difficulty in reading schematics
and circuit diagrams, please enroll in a basic electrical
course at your local school or college.
(Refer to the following pages for Schematics )
CONDENSER
If the ice maker is producing soft, wet ice or if it is not
making enough ice, the problem may be air flow restric-
tion in the condenser.
Check the condenser coil fins to be sure they are
straight, allowing full air flow across the coils. If any fins
are bent, carefully straighten them.
Inspect the coil and fin assembly for dirt, lint, etc. Using
a soft bristle brush, remove all such debris and vacuum
up the residue. Any restriction to air flow across the
condenser coil fins will reduce the efficiency drastically.
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