Ice Maker - Norcold 121X Series Service Manual

Ice Maker

The ice maker, illustrated in Figure 10-1, is
supplied AC power through a wire harness. It
is ON when the shut-off arm is lowered to the
down position and OFF when the shut-off arm
is raised to the up position.
OFF
ON
Shut-off arm
Figure 10-1.
Specifications
Cycle duration..............................3.5 to 7 minutes
Water fill capacity ................... 4.7 fl. oz. (140 mL)
Ice yield ....................3.5 lbs/24 hr.. (approximate)
Electrical rating ..........185 W @115 VAC/60 Hertz
Amperage (A) draw:
Cycle on/heater on................................... 1.6 A
Cycle on/heater off ................................... 0.3 A
Cycle off .............................No amperage draw
Motor ........................................ 1.5 W/8800 ohms
Mold heater.................................. 185 W/72 ohms
s 10 —i
ection
—Ice
maker.
M
ce Aker
Operation
The left freezer temperature determines the
efficiency of the ice maker. The colder the
temperature in the freezer, the faster the water
in the mold will freeze.
To harvest the ice the temperature in the
freezer needs to be colder than 12 degrees
Fahrenheit (-11.1 degrees Celsius).
The thermostat attached to the mold senses
the mold temperature. At approximately 17 to
14 degrees Fahrenheit (-8.3 to -10 degrees
Celsius) the thermostat energizes the stepper
motor and the heater.
As the motor turns the ejector blades begin
to make contact with the top of the ice cubes,
The motor rotates back and forth causing the
blades to exert pressure on the ice cubes as
the mold heater warms the bottom of the mold.
Once the ice cubes are freed, the motor
continues to turn the ejector, which in turn
sweeps the ice cubes out of the mold and into
the ice bin. At the same time the shut-off arm
begins to swing up, which indicates the end of
ice harvesting. This begins a new cycle.
As the ejector blades point to the 12
o'clock position, the water valve opens for
approximately seven seconds and refills the
mold with approximately 4.7 fluid ounces of
water.
After the mold is refilled, the shut-off arm
drops to the ON position. When the thermostat
senses mold temperature to be 17 to 14
degrees Fahrenheit (-8.3 to -10 degrees
Celsius) the cycle starts again.
Ice Yield
The ice maker can produce up to 3-1/2 pounds
per day, depending on usage and freezer door
openings.
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S 10
ection