For Service Technician Use Only
DIAGNOSTICS
1-14
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French-Door Bottom Mount Refrigerator
Air Flow System
The air flow system is composed of ducting and a number of
fans to provide air flow to the four temperature controlled zones
located in the RC and FC Compartments. Proper air flow allows
efficient removal of heat and uniform temperature distribution in
each zone.
The air flow system also provides air flow 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.
Refrigerator Compartment (RC) Airflow
The RC evaporator fan and the pantry air baffle are located in the
evaporator cover assembly in the RC. They control airflow to the
two temperature controlled zones, the RC and the pantry.
RC Evaporator Fan
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 Off by a
12.7 VDC gating signal from GF2 board P14-3. The gating 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 time the refrigeration system is
cooling the RC. The RC fan will run for a period of time following
cooling, and then be switched off. If the refrigerator is in pull
down mode, the RC fan will run for an additional 20 minutes
after completion of RC cooling.
If the RC evaporator needs defrosting, the RC fan may run for up
to 10 additional minutes after RC cooling.
Pantry Air Baffle
The pantry is the second temperature controlled zone cooled by
the RC evaporator. The pantry is cooled by airflow from the RC
fan directed through foam ducting in the RC evaporator cover
assembly. The pantry air baffle 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 position indication
for the pantry air baffle.
The pantry air baffle will open when:
•
Pantry requests cooling.
•
RC is cooling.
The pantry air baffle will be CLOSED at all other times.
Freezer Compartment (FC Airflow)
The FC evaporator fan and the ice box fan are located in the FC.
They control airflow to the two temperature controlled zones,
the FC and the ice box.
FC Evaporator Fan
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 Off by a
12.7 VDC gating signal from GF2 board P14-1. The gating 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 time the refrigeration system is
cooling the FC. The FC fan will run for an additional 2 minutes
after completion of FC cooling. The FC fan will also run an
additional 2 minutes after completion of cooling while the
refrigerator is in Pull Down Mode.
Ice Box (IB) Fan
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 left 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 Off by a 12.7 VDC gating
signal from GF2 board P9-2. The gating 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 time the FC fan is On. The IB Fan is Off when
the FC fan is Off.
Air Baffle
Location
RC Fan Location
B
A
A. IB Fan
B. IB Air Duct Return
