DRAFT
NOT FOR PUBLIC RELEASE
29
www.norcold.com/cda N500/N510 ModelsRefrigerator Service Manual
ELECTRICAL REQUIREMENTS AND COMPONENTS
AC Fuse
N500 Models
The N500 ac circuit is protected by a 5 A,
1
/4
in.x 1
1
/4
in.
AGC type fast acting fuse housed in an in-line type fuse
holder.
N510 Models
The N510 ac circuit is protected by a 5 amp fuse
located on the left side of the power board. The power
board cover must be removed to gain access to the
fuse.
When the refrigerator operates with poor or no cooling
in ac operation, but operation is present:
a. Measure ac voltage input to the power board.
b. Measure heater amp draw.
c. If amp draw is not as specified, measure the
heater's resistance at ambient temperature.
AC Power
AC Power Requirements - All Models
AC mode operation requires 108 to 132 Vac for ac
heater operation. AC power must be supplied through a
2 pole/3 wire/20 amp grounding type receptacle.
When replacing an ac heater make sure the stop bead
rests fully against heater tube rim. See Figure 26.
DC Power
DC Power Requirements
N500 (2-way models)
DC operation requires 12 to 15 Vdc power for relighter
and ignition circuit. The ignition circuit requires 10.5 to
15.4 Vdc.
N510 (2-way models)
Electronic controls operate on 10.5 and 15.4 Vdc. A
voltage drop below 10.5 Vdc or rise above 15.4 Vdc will
cause the controls to set fault codes on the display. The
control circuit is protected with a 5 amp automotive type
fuse (located on the right side of the power board).
N500.3/N510.3 (3-way models)
For 3-way models, the controls and ignition circuit
operate at 12 to 15 Vdc. The dc heater operates at 13.5
to 15.4 Vdc.
DC Heater - N500.3/N510.3
The dc heater, which has yellow leads, is shown in
Figure 27, page 30. The heater is rated for 225 watts/16
amps, and requires 12 to 15 Vdc for operation. Heater
resistance is 0.87 ohms.
Relighter - N500/N500.3
The relighter is a potted modular 12 Vdc circuit
protected by a 1 amp
1
/4
in. x 1
1
/4
in. AGC type fast
acting fuse housed in an in-line fuse holder. To replace
the relighter, see the procedure on page 42.
Figure 26. AC heater in heater well
Stop bead
Black wires
Heater data
The ac heater, see Figure 26, has black leads and is a
cartridge type heater. The heater is rated for 200 watts/
2.5 amps at 110 Vac. Heater resistance is 61.3 ohms.
The ac heater replacement procedure is located on
page 30.
AC Heater
!
WARNING:
Electric shock hazard! The refrigerator is fed power
from more than one source. Unplug the ac cord from
the RV ac receptacle before servicing electrical or
electronic components.
!
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:
Do not cut or remove the ground prong from the power
cord. Do not use a two-prong adapter or an extension
cord. Connect the ac power cord only to a grounded
three-prong type receptacle. Operation of the
refrigerator without a ground connection or with a faulty
ground connection can result extensive property
damage, injury, or death.
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