Electrical Requirements And Components; Dc Voltage Requirements And Polarity; Power Board Dc Fuse; Dc Power Wiring Requirements - Norcold 1200 series Service Manual

ELECTRICAL REQUIREMENTS AND COMPONENTS

DC Voltage Requirements and Polarity

The operating controls require 10.5 to 15.4 Vdc 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 automotive
blade type 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 low voltage and high amp draw conditions. The
high amp draw caused by a circuit using undersized
wires will cause the wire to overheat and creates an
electrical fire hazard.
18 AWG is the minimum AWG size wire that can be
used for connecting DC power to 2-way models. The
fuse size for overload protection must not exceed 6
amps.

AC/DC Converter as Power Source

The power board must be supplied 12 Vdc only from
the filtered output (battery side) of a converter.
Unfiltered voltage (commonly referred to as AC ripple)
output of AC/DC converters can cause the electronic
controls to set false fault codes. It can also turn off the
refrigerator or prevent the refrigerator from turning off.
Refrigerator Service Manual
WARNING:
WARNING:
www.norcold.com/cda
Lamp/Thermistor Assembly
The operation of the fresh food compartment 12 Vdc
lamp is controlled by two switches mounted on the top
of the fresh food cabinet and activated by the fresh
food cabinet doors.
Leaving the door ajar or open for more than two
minutes causes the controls to display a "dr" fault
code. Closing the door turns off the light and clears the
"dr" fault from the display. The fault code is stored in
the diagnostic mode nonvolatile memory. For "dr"
troubleshooting procedures, see page 16. As shown in
Figure 27, the light assembly harness and thermistor
share the same connector.
On older models (SN 832170 and lower), the
thermistor is attached to the twentieth fin from the
right on the fin assembly. On models SN 832170 and
higher or models that have had a new style power
board installed, the thermistor is attached to the
second fin from the right. The thermistor senses fin
temperature, which can be accessed through the
Diagnostic Mode, pages 48 and 50. If the thermistor
fails, the controls will activate Backup Operation
System, page 17.
Connector
Thermistor
Clip
Figure 27. Lamp/thermistor assembly

Divider Heater

The divider heater is permanently "foamed" between
the divider separating the freezer and fresh food
compartment. The controls constantly monitor power
board voltage output to the heater through built in
diagnostics (see pages 47 and 51). Turning the
refrigerator on automatically energizes the heater.
1200XX/120X-IMXX Models
Light bracket
Lightbulb
Light cover
29