Electrical Requirements And Components; Dc Voltage Requirements And Polarity; Power Board Dc Fuse; Dc Power Wiring Requirements - Norcold N61X Service Manual

ELECTRICAL REQUIREMENTS AND COMPONENTS

DC Voltage Requirements and Polarity

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 5 amp (tan
color) 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.

2-Way Models

18 AWG is the minimum AWG size wire that can be
used for connecting DC power to 2-way models. The
size fuse for overload protection must not exceed 6
amps.
3-Way Models
The distance between the RV DC power source and
the power board DC power connection terminals
dictates the AWG size wire that must be used. If the
distance from the DC power source is:
n
20 feet or less – 10 AWG or a larger gauge wire
must be used. The size fuse for circuit overload
protection must not exceed 30 amps.
n
Over 20 feet – AWG 8 or a larger wire gauge must
be used. The size fuse for circuit overload
protection must not exceed 40 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
DC Heater–3-Way Refrigerators Only
Do not wire the heater(s) direct! Wiring heater(s)
direct bypasses control safety devices and creates
the potential for an electrical fire.
The DC heater, shown in Figure 19, is a cartridge type
heater. The DC heater is rated for 225 Watts/16 amps,
at a nominal 14 Vdc. Heater resistance should be
0.82 - 0.91 ohms.
NOTE
The AUTO DC and DC-Manual Mode operation
maintain refrigeration only.
Stop Bead
Yellow Wire Leads
Figure 19. DC Heater
When AUTO DC or DC-Manual Mode does not
maintain refrigeration and ventilation is correct:
n
Measure DC voltage input to the power board.
n
Measure the heater's amp draw.
n
If amp draw is not as specified, measure the
heater's resistance at ambient temperature.
The DC heater must be inserted into the heater tube
until the stop bead makes full contact with the tube's
rim. See Figure 20, page 34.

DC Heater Circuit Fuse

Never replace a fuse with a higher amp rated fuse.
Always use the specified fuse.
The DC heater circuit fuse is a standard 30 amp
(green) automotive blade type fuse. It is located on the
power board, terminal F2.
WARNING:
WARNING:
33
N6XX/N8XX Models