Whirlpool 8178501A, Manual

Page: 14 / 52

2-4
Ice Dispensing
IDI ice dispensing is the same as in Side-By-
Side IDI electronic dispensers, with the addition
of an ice door that is powered open and closed
by an electric motor. When the dispenser pad
is depressed, the user interface commands
the core control to dispense ice, based on the
cube/crushed keypad selection.
The core control directs 120 volts AC through
the PTC in the IDI motor, and back to the core
control. The core control rectifies the 120 volts
AC, and 120 volts DC is sent back out on the
BR/WH and RD/WH wires. The polarity de-
termines the direction that the motor will run.
RD/WH wires will be positive for crushed ice,
and will run clockwise. The BR/WH wires will
be positive for cubed ice, and will run coun-
terclockwise.
The following sequence occurs:
1. The ice pad switch is pushed closed.
2. The user interface receives the signal.
3. The user interface signals the core control
on P1-2 which direction to run the auger.
4. The core control outputs the square wave
to the ice door motor for approximately
1 second, and at the same time, the IDI
motor is energized on P2-1 and P2-2 with
120 volts DC.
5. When dispensing has stopped, the ice
door will remain open for 10 seconds, and
then power is applied for approximately
1 second to close the door.
Operation Defaults
Low water pressure: If the water pressure falls
below 5 psi, or if the flowmeter fails, the fast fill
dispenser system will assume the pressure to
be at 60 psi, and will default to a timed fill. The
accuracy of the fill will depend on the amount
of pressure that is above or below 60 psi. For
example, if the actual water pressure is 5 psi,
the water volume dispensed will be low.
During low water pressure default, the ice
maker will fill for 7.5 seconds.
Dispenser fill timeout: If water is dispensed
continuously for 5 minutes by the customer, or
if a water pad switch fails closed, power will be
interrupted to the valve. Normal operation will
resume when the closed switch is released.