Whirlpool KRFC704FSS - Page 21

For Service Technician Use Only
DIAGNOSTICS
French-Door Boom Mount Refrigerator
n
1-17

When the ice is ready, the IM will Harvest. Before Harvesng,
the IM checks that the Ice Bucket is in place (Ice Bucket Switch
Closed).

12.7 VDC is applied to the IM Motor, driving it Counter-
Clockwise (CCW) to the Ice Break posion. In this posion,
the Ice Tray is exed, breaking the ice.

At the Ice Break posion, polarity is reversed, driving the Ice
Tray clockwise (CW). As the Ice Tray connues driving past
the home posion, the Bail Arm lowers. If the Ice Bucket is
full, a switch will close in the gearbox, changing the resistance
of the resistance ladder. The polarity is again reversed to
the motor, returning the Ice Tray to the Home posion. This
process will repeat every hour unl the Ice Bucket is not full.

As the Ice Tray drives CW past the home posion, the Bail
Arm is lowered. If the Ice Bucket is not full, the Ice Tray will
connue driving to the End of Travel posion.

The tray is exed as it reaches End of Travel, releasing the ice
to fall into the Ice Bucket.

When the tray reaches End of Travel, voltage polarity to the
motor is again swapped. The Ice Tray drives CCW unl it
senses the Home posion and stops. The ice maker is now
ready for a new ll cycle to begin making more ice.

While the Ice Tray is travelling, a jammed mer is iniated. If the
Ice Tray does not return to the Home posion within 90 seconds,
the IM transions to a Jammed state, and will not make Ice. The
IM will aempt to Home once every hour.

Operaon of the Freezer Ice Maker is nearly idencal to the In-
Door Ice Maker, with a few excepons.
Time and temperature condions for the Freezer Ice Maker ice
to be ready are dierent from the Door Ice Maker. In Normal
and Max Ice Mode, a 100 minute freezer mer must be sased,
and the Ice Tray temperature must read 3°F (-16°C) before the
Ice is ready for Harvest. Opening of the Freezer Door during
freezing will pause and add me to the freeze mer. The Freezer
IM is mounted to the top of the FC liner and has a dierent
part number. There is no Ice Bucket Switch associated with the
Freezer IM.

The refrigerator is capable of dispensing cubed or crushed ice
from the In-Door Dispenser.
Ice is requested through the Dispenser UI. To dispense ice, the
Ice Door is opened, and the Auger Motor turns in one direcon
for cubed ice, and the other direcon for crushed ice.

The Ice Door Motor opens to allow ice to be dispensed. It closes
10 seconds aer the Ice Paddle is released to prevent loss of cold
air.
The Ice Door motor operates on 12.7 VDC supplied from the
Dispenser UI, J5-1.

The Ice Dispensing Auger Motor can operate bidireconally. It
rotates one direcon for cubed ice, and the other direcon for
crushed ice.
The Auger Motor operates on 130 VDC supplied from the GF2
board, P3-7.