Whirlpool KRFC704FBS - Theory of Operation; Power Distribution

For Service Technician Use Only
DIAGNOSTICS
French-Door Boom Mount Refrigerator
n
1-7
Theory of Operation
Power Distribution

The refrigerator components operate at 115 VAC, 140 VDC, and
various DC low voltages.
This secon describes how power is supplied to the refrigerator
and distributed to the control boards. The control boards provide
power output to individual components.

Power is supplied to the refrigerator by a plug and is ltered
through an Electromagnec Interference (EMI) lter. The EMI
lter prevents electrical interference from entering or leaving the
refrigerator over the power cord.
The EMI Filter is located in the machine compartment. It is
aached to the cover of the Orion Assembly.
The power cord mates to the EMI lter through a 4-pin
connector. Pin 3 (Line) and Pin 4 (Neutral) supply power from the
power cord to the EMI Filter. The 120 VAC output of the EMI lter
leaves the lter at Pin 1 (Line) and Pin 2 (Neutral) and is routed to
the Orion board Connector P1.

The Orion board is aached to the le rail in the machine
compartment. The board receives 115 VAC power and uses it to
power loads and distribute power to other control boards (Refer
gure on Page 1-9).
P1
1
2
3
4
ORION BOARD
P1
NEUTRAL
BK (SMOOTH)
BK (RIBBED)
POWER CORD LINE
GROUND
EMI
FILTER