Power Distribution - Whirlpool WRT138FZDB SERIES Service Manual

POWER DISTRIBUTION

The refrigerator components operate at 120 VAC and 5 VDC.
This section describes how power is supplied to the
refrigerator and distributed to the control board(s). The
control board(s) provide power output to individual
components.
POWER SUPPLY
120 VAC Power is supplied to the refrigerator at the Machine
Compartment by a plug. From the Machine Compartment,
120 VAC Power is routed to the Refrigerator Compartment
(RC), and the Freezer Compartment (FC).
The 120 VAC routed to the FC terminates at the liner side
connector for the optional Ice Maker.
The 120 VAC routed to the RC is factory spliced and routed to
the RC Light, Hercules Control Board at CN2-4, and on some
models, to the FC Light.
HERCULES CONTROL BOX
The Hercules Control Box (CB) (Figure 1) is located in the RC,
in the housing for the User Interface (UI).
FIGURE 1: Hercules Control Box
120 VAC Supply
120 VAC power from the power cord is supplied to the CB at
CN2-4.
120 VAC Load(s)
The CB supplies 120 VAC power to the following loads:
• Compressor
• Condenser Fan
• Evaporator Fan, and
• Defrost Heater
For Service Technician Use Only
5 VDC Supply
The CB generates 5 VDC power from the 120 VAC power
supply. The 5 VDC power is used to power loads.
5 VDC Load(s)
The CB supplies 5 VDC power to the following loads:
• RC Thermistor
• FC Thermistor
• Evaporator/Defrost Thermistor
18.2 Cu Ft Top Mount Refrigerator
THEORY OF OPERATION
2-3
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