Whirlpool KRFC704FSS - Air Flow System

For Service Technician Use Only
DIAGNOSTICS
1-14
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French-Door Boom Mount Refrigerator
Air Flow System
The air ow system is composed of ducng and a number of
fans to provide air ow to the four temperature controlled zones
located in the RC and FC Compartments. Proper air ow allows
ecient removal of heat and uniform temperature distribuon in
each zone.
The air ow system also provides air ow in the machine
compartment, cooling equipment and removing waste heat from
the condenser.
All fans are supplied with a constant 12.7 VDC power from the
Orion board, P16-4. The fans are switched On, when necessary,
by a separate 12.7 VDC signal provided from the GF2 board.

The RC evaporator fan and the pantry air bae are located in the
evaporator cover assembly in the RC. They control airow to the
two temperature controlled zones, the RC and the pantry.

The RC evaporator fan is a variable speed fan. It moves RC air
over the evaporator to remove heat from the RC.
The RC evaporator fan is supplied with constant 12.7 VDC power
from Orion board P16-4. The fan is switched On and O by a
12.7 VDC gang signal from GF2 board P14-3. The gang signal
is adjusted based on temperature to change the speed of the fan
between HI (3450 rpm) and LOW (1725 rpm).
The RC fan is switched On any me the refrigeraon system is
cooling the RC. The RC fan will run for a period of me following
cooling, and then be switched o. If the refrigerator is in pull
down mode, the RC fan will run for an addional 20 minutes
aer compleon of RC cooling.
If the RC evaporator needs defrosng, the RC fan may run for up
to 10 addional minutes aer RC cooling.

The pantry is the second temperature controlled zone cooled by
the RC evaporator. The pantry is cooled by airow from the RC
fan directed through foam ducng in the RC evaporator cover
assembly. The pantry air bae is either full open, or full close
dependent upon pantry temperature.
The pantry is operated by 115 VAC power supplied from GF2
board P2-5. 115 VAC power is also supplied to a feedback switch
by GF2 board P2-2, providing the board with posion indicaon
for the pantry air bae.
The pantry air bae will open when:
• Pantry requests cooling.
• RC is cooling.
The pantry air bae will be CLOSED at all other mes.

The FC evaporator fan and the ice box fan are located in the FC.
They control airow to the two temperature controlled zones,
the FC and the ice box.

The FC evaporator fan is a variable speed fan. It moves FC air
over the evaporator to remove heat from the FC.
The FC evaporator fan is supplied with constant 12.7 VDC power
from Orion board P16-4. The fan is switched On and O by a
12.7 VDC gang signal from GF2 board P14-1. The gang signal
is adjusted based on temperature to change the speed of the fan
between HI (3450 rpm) and LOW (1725 rpm).
The FC fan is switched On any me the refrigeraon system is
cooling the FC. The FC fan will run for an addional 2 minutes
aer compleon of FC cooling. The FC fan will also run an
addional 2 minutes aer compleon of cooling while the
refrigerator is in Pull Down Mode.

The IB Fan is a variable speed fan located in the FC. It circulates
air from the FC Evaporator area to the IB in the le RC door to
maintain temperature at its set-point. For models with an ice
maker in the FC, it also circulates air over the FC ice maker.
The IB fan is supplied with constant 12.7 VDC power from Orion
board P16-4. The fan is switched On and O by a 12.7 VDC gang
signal from GF2 board P9-2. The gang signal is adjusted based
on temperature to change the speed of the fan between HI
(3450 rpm) and LOW (1725 rpm).
The IB fan is On any me the FC fan is On. The IB Fan is O when
the FC fan is O.
Air Baffle
Location
RC Fan Location
B
A
A. IB Fan
B. IB Air Duct Return