Whirlpool 8178501A Manual page 12

Ice Dispenser Motor
All Fast Fill Dispenser System models will have
IDI, (In-Door Ice). A bridge rectifier on the core
control will rectify 120 volts AC to 120 volts DC
for the ice dispenser motor. Changing polarity
will reverse the motor to change from crush to
cube modes. Clockwise (CW) rotation is crush
and counterclockwise (CCW) is cube mode.
Ice Door Motor
The ice door is opened and closed by a DC mo-
tor driven by a 12 volt DC square wave. When
ice dispensing begins, the motor is driven in the
CCW direction for approximately one second
to open the door. When ice dispensing ends,
there is a delay of 10 seconds to allow all ice
to clear before the motor is driven CW to close
the door. No switches are used to determine
the position of the door motor. To ensure the
ice door is not left open, a request is made to
fully open and then close the door one hour
after ice has been dispensed. If a cube had
temporarily jammed open the door, this will
ensure it does not stay open indefinitely. A re-
quest to fully open and then close the door is
also made immediately when power is applied
or restored to the refrigerator.
Ice Door And Housing Heaters
The housing heater is a 120 volt AC, 2.25 watt
heater. Service doors for refrigerators with
stainless steel door skins will have additional
zone heaters to reduce moisture and will be
4.25 watts. A 14 volt DC, 1 watt, heated service
ice door will be available. It is powered from
P3 on the core board.
Smart Valve
The smart valve is responsible for water dis-
pensing and filling the ice maker. It also monitors
total water volume used and accumulated time
for the water filter indication. It drives the ice
maker valve solenoid and the water dispenser
valve solenoid.
120 volts AC will always be present at P1-4
and P1-5 on the smart valve. P1-1 is the AC
input from the ice maker to start an ice maker
fill request. 120 volts AC for any length of time,
signals the valve to fill the ice maker. The valve
fills the ice maker by volume, not by time. 14
volts DC will always be present at P2-1 and
P2-3.
2-2