Icemaker Information
600 Series
(Prior to #1810000)
6-2
#3756270 - Revision B - January, 2006
ICEMAKER SYSTEM INFORMATION
All 600 series units utilize a MidSouth icemaker. An
Icemaker’s operation is not complex, but understanding
its components and its operation cycle is necessary for
a Service Technician to understand in order to make a
proper diagnosis.
TO AVOID ELECTRIC SHOCK, ALWAYS DISCON-
NECT ELECTRICAL POWER TO UNIT WHEN SER-
VICING ICEMAKER.
NOTE: The ICE ON/OFF key at the control panel acti-
vates the icemaker system. If “ICE” is not displayed on
the LCD, the icemaker system will not function.
NOTE: To allow ice to freeze fully and reduce effects of
low water pressure, the electronic control disables the
icemaker system for 45 minutes after each ice harvest.
NOTE: The ice bucket in models 601F, 611 and 650,
have a tab at the left rear corner that activates a switch
when the ice bucket is in place. The ice bucket in the
models 680 and 690 also activates a switch when in
place. If the ice bucket is not in proper position on any
model, ice production will stop.
NOTE: The icemaker relay on the control board also
controls the fill tube heater and water valve.
ICEMAKER COMPONENTS
Following are descriptions that explain the function of
each icemaker component. The components are dia-
gramed in Figure 6-1 on the next page.
Support - The support is the housing around the elec-
trical components and wire connections. The support is
attached to the ice mold.
Mounting Plate - The drive motor, holding switch,
water valve solenoid switch, timing gear, timing cam
and water fill adjusting screw are attached to the metal
mounting plate. The mounting plate is then attached to
the support.
Drive Motor - 115 volts AC supplied to the drive motor
causes the motor to operate. The motor has a single
output shaft with a small gear. The motor gear
drives/spins the timing gear.
Timing Gear - The timing gear is driven/spun by the
drive motor gear and is attached to the timing cam.
Timing Cam - The timing cam is attached to the tim-
ing gear and the ice ejector is inserted into the center of
the timing cam. As the timing cam rotates, high and
low spots on the cam operate the water valve solenoid
switch and the holding switch. The timing cam also
moves the lever arm side to side and rotates the ice
ejector.
Ice Mold - The ice mold is where the eight crescent
shaped ice cubes are formed.
Mold Heater - The mold heater uses 175 watts to
thaw the ice free from the mold.
Ice Ejector - The drive end of the ice ejector is “D”
shaped to fit into the “D” shaped hole in the timing cam.
It has eight blades which rotate and sweep the ice from
the mold cavities during the ejection phase of the cycle.
Ice Stripper - The stripper is attached to the dumping
side of the mold, serving as a decorative side cover and
it also prevents ice from falling back into the mold.
Bearing / Inlet - The bearing / inlet is attached to the
ice mold, opposite the support. Water enters the bear-
ing / inlet and is directed to the ice mold. The
bearing/inlet also supports the ice ejector at the end
opposite the timing cam.
Thermostat - The thermostat is a single-pole, single-
throw, bi-metal switch. At 15°F/± 3°F it closes, starting
the ice ejection phase.
Thermal-Mastic - A substance similar in appearance
to grease that is applied between the thermostat and
the ice mold. Its purpose is to increase thermal con-
ductivity between the mold and the thermostat.
Lever Arm and Shut-off Arm - The lever arm is
moved side to side by two revolutions of the timing
cam. As it moves, it raises and lowers the shut-off arm
and operates the shut-off switch to control the quantity
of ice production. If the shut-off arm comes to rest on
top of the ice in the storage bin during either revolution,
the shut-off switch will remain open, stopping ice pro-
duction at the end of that revolution.
Water Valve Solenoid Switch - A single-pole, double-
throw type switch that allows electricity to the water
valve solenoid, opening the valve, during the fill cycle.
Holding Switch - A single-pole, double-throw type
switch that assures completion of a revolution once the
icemaker has been energized.
Shut-off Switch - A single-pole, double-throw type
switch that stops ice production when the ice bin is full.
TCO (Thermal Cut Out) - The TCO is thermal protec-
tion device in the wire harness that would open in the
event of mechanical failure, thus protecting against over
heating. (The TCO is not shown in diagram.)
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