Service manual

Ice Maker
4-3
Timing Switches
The three timing switches used are single-pole, double
throw (SPDT). They are identical except for function,
and can be used interchangeably.
1. Hold Switch - assures completion of a revolution
once the ice maker operation has started.
2. Water Fill Switch - opens the water valve during the
fill cycle. It is the only adjustable component in the
ice maker.
3. Shut-off Switch - stops ice maker operation when the
storage container is full of Ice. The switch is opened
after the sensing arm is raised to its most upright
position. The switch is mounted to the top right wall
of the ice maker support.
Thermal Cut-Out (TCO)
The thermal cut-out is a one-time limit fuse used as a
safety device. It is located under the mounting plate, in
the head of the ice maker, between the thermostat and
wire connector.
If the thermal cut-out opens, the cause of failure must
be determined and corrected prior to replacing the TCO.
Normals causes of the TCO failing are a bad thermostat
or a shorted coil on the water valve.
Timing Cam & Coupler
Three separate cams are combined in one molded Delrin
part:
1. Inner cam operates shut-off switch lever arm.
2. Center cam operates hold switch.
3. Outer cam operates water fill switch.
One cam end is attached to a large timing gear. The other
cam end is coupled to the ejector.
Timing Gear
This large molded plastic gear is driven by the motor and,
in turn, rotates the cam and ejector. A “D” shaped hole
in the gear fi ts over the timing cam hub. Spacer tabs on
the backside of the gear prevent the gear from binding on
the mounting plate.
Motor
A low wattage, stall-type motor drives the timing gear.
This gear turns the timing cam and ejector blades
approximately one revolution every three minute (1/3
RPM).
On/Off Switch
A single-pole, single-throw switch is mounted on the right
side of the housing at the front of the ice maker. This
switch is used to turn the ice maker off. Unlike the switch
on the bail arm the on/off switch will stop the ice maker
as soon as it is pushed, and it will not allow the ice maker
to complete the revolution.
Wiring
A four-prong plug connects the ice maker wiring to the
cabinet wiring harness. The ice maker assembly is wired
across the line and will harvest in either the refrigeration
or defrost cycles. A wiring diagram is located inside the
front cover of the ice maker.