DRAFT
NOT FOR PUBLIC RELEASE
30
www.norcold.com/cda
N500/N510 Models
Refrigerator Service Manual
DC Heater–3-Way Refrigerators Only
When refrigerator is in dc operation and does not
maintain refrigeration and ventilation is correct:
a. Measure dc voltage input to the power board.
b. Measure the heater's amp draw.
c. 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.
The stop bead is shown in Figure 27.
The N500 dc heater fuse is a 25 amp inline fuse. The
N510 dc heater circuit fuse is a standard 30 amp
(green) automotive blade type fuse. It is located on the
power board, terminal F2.
Figure 27. DC heater
2-Way Model Wiring
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 Model Wiring
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:
T 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.
T Over 20 feet – AWG 8 or larger wire gauge must be
used. The size fuse for circuit overload protection
must not exceed 40 amps.
Stop bead
Yellow wire leads
Heater data
!
WARNING:
Do not wire the heater(s) direct! Wiring heater(s)
direct bypasses control safety devices and creates the
potential for an electrical fire.
!
WARNING:
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.
!
WARNING:
Never replace a fuse with a higher amp rated fuse.
Always use the specified fuse.
Replacing AC or DC Heater
1. Turn refrigerator OFF.
2. Unplug ac power cord and disconnect 12 Vdc power
source.
3. Disconnect heater leads.
4. Remove heater from heater well.
5. Install replacement heater in heater well, making
sure that stop bead rests fully against heater well
rim. Stop bead is shown in Figure 26, page 29, and
Figure 27.
6. Connect heater leads.
7. Reconnect 12 Vdc power source.
8. Plug in ac power cord.
9. Place refrigerator in service.
DC Heater Circuit Fuse
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