Electrical Requirements And Components; Dc Voltage Requirements And Polarity; Power Board Dc Fuse; Dc Power Wiring Requirements - Norcold N109X Series Service Manual

ELECtRICaL REQuIREMENtS aND COMPONENtS

DC Voltage Requirements and Polarity

The operating controls require 10.5 to 15.4 volt DC to
operate. The positive wire lead (+) connects to power
board terminal 12VDC; the negative wire lead (–)
connects to terminal GND1.

Power board DC fuse

Never replace a fuse with a higher amp rated fuse.
Always use the specified fuse.
The controls circuit fuse is a standard 5 amp (tan color)
automotive blade style fuse. It is located on the power
board, terminal f1.

DC Power Wiring Requirements

Never use undersized wires to supply DC power to
the power board. The use of undersized wires can
cause high amperage draw. The high amperage
draw can cause the undersized wires to overheat,
which creates an electrical fire hazard.
Consult the installation manual provided with the
refrigerator to calculate the correct wire size and circuit
protection fuse.

aC/DC Converter as Power Source

The power board must be supplied 12 volt DC only from
the filtered output (battery side) of a converter.
Unfiltered voltage (commonly referred to as AC ripple)
found in the output of low line AC/DC converters can
cause the electronic controls to set false fault codes. It
can also cause the controls to turn off the refrigerator or
prevent it from turning off.
28
N109X Models
WARNING
WARNING :

Lamp assembly

As shown in Figure 24, the light assembly harness and
thermistor share a four terminal modular connector.
The operation of the fresh food compartment 12 volt
DC lamp is controlled by a magnet activated reed relay
switch. The switch is in the optical control circuit board.
The magnet is permanently mounted in the underside
fresh food compartment door upper cap. If the light does
not come on when the fresh food compartment door
is open, check the light bulb condition. If the light bulb
is in good condition refer to page 14 of this manual for
additional troubleshooting information.
Leaving the door ajar or open for more than two minutes
causes the controls to display a "dr" fault code, de-
energize the circuit, store the fault in nonvolatile control
memory, and sound an intermittent beeping audible
alarm. Closing the door automatically resets the light
circuit and clears the "dr" fault from the display. The
stored fault code can cleared through the Diagnostic
mode (see page 43).
Connector
Thermistor
Clip
figure 24. Lamp/thermistor assembly

Divider heater

The divider heater is permanently "foamed" between
the divider separating the freezer and fresh food
compartment. The controls automatically send voltage to
the heater when the refrigerator is turned on. Tis output
can be seen in Diagnostic mode, Screen 8 (see page 44).
Light bracket
Lightbulb
Light cover
Refrigerator Service Manual