12
www.norcold.com
Polar Series N7V, N7X, N7XL / N8V, N8X, N8XL
GENERAL INFORMATION - Electrical Connections, cont’d.
Electrical Components
Interior Light
The interior light is located in the top of fresh food compartment.
The light remains on at all times while the refrigerator is ON.
Divider Heater
The divider heater is permanently “foamed into” the divider be-
tween the freezer compartment and the fresh food compartment.
The divider heater warms this area to prevent condensation from
forming. Powering on the refrigerator automatically powers on the
divider heater. Power to the heater is continuously supplied by the
main control board (power board).
There are three (3) fuses located on the main control board (power
board). Two (2) are MINI ® Blade, Automotive Style Fuses used to
protect DC voltage circuits (F1 and F2) and one (1) is a glass body
cartridge style fuse (F3) used to protect AC voltage circuits.
Fuse F1
This is a DCV, 5-Amp, 32V, MINI ® Blade, Automotive Style Fuse.
It is used to protect the DC circuitry / componentry located on the
Main Control Board (Power Board).
Fuse F2
This is a DCV, 7.5-Amp, 32V, MINI ® Blade, Automotive Style
Fuse. It is used to protect DC “loads” connected to the auxiliary
output of the main control board (power board).
Examples of these loads are: External cooling fan, waterline heat-
ers, etc.
Fuse F3
This is an ACV, 8-Amp, 250V, Glass Body Cartridge, FST 5x20mm,
Automotive Style Fuse. It is used to protect the AC circuitry / com-
ponentry located on the main control board (power board).
Fig. 8 - Fan wiring
Main Control Board (Power Board) Fuses
A
Fan
B
Thermostatic Switch
C
Condenser
D
Auxiliary Wire Harness
E
P1-1 Auxiliary 12 VDC (ground)
F
P1-6 Auxiliary 12 VDC (positive)
Fig. 7 - Fuse locations
F3
F1
NOR000815A
F2
11 10 9
5 4 3
8 7 6
2 1
12
13
14
15
16
P1
12 Volt DC Fan
A 12 volt DC fan (Fig. 8, A) increases ventilation of the cooling
system. The fan is located near the condenser on the rear of the
cooling system foam plug. Fan resistance through the fan motor
circuit is approximately 1.8 ohms.
The fan is unidirectional and is controlled by a thermostatic switch
(Fig. 8, B).
The thermostatic switch is located on the first condenser fin (Fig. 8,
C).
The switch turns the fan on and off. The fan comes on when the
temperature of the first condenser fin is about 130° F (54.4° C) and
turn off at about 115° F (46°C).
The DC power is supplied by an auxiliary wire harness (Fig. 8, D)
through to connector pins P1-1 (Fig. 8, E) and P1-6 (Fig. 8, F).
If the vehicle has a roof exhaust vent,
you may need to remove the refrigerator
from the enclosure to test the thermo-
static switch. If the vehicle has an upper
side-wall exhaust vent, you can test the
thermostatic switch by removing the upper
sidewall vent.
Low Ambient Heater (optional)
Some models are factory equipped with a low ambient heater.
This heater is controlled by a thermostat. The thermostat allows DC
voltage to the heater only while the refrigerator is turned ON and
only when the ambient temperature is low enough.
NOTICE
B
C
A
F
E
NOR000793A
D
