Main Control Board (Power Board) Fuses; Electrical Components; Interior Light; Divider Heater - Norcold Polar 10 Series Service Manual

General Information - Electrical Connections, cont'd.

Main Control Board (Power Board) Fuses

There are three (3) fuses located on the Main Control Board (Pow-
er 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 / components 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 heaters, etc.
Fuse F3
This is an ACV, 8 Amp, 250 V, Glass Body Cartridge, FST 5x20
mm, Automotive Style Fuse. It is used to protect the AC circuitry /
components located on the Main Control Board (Power Board).
F3

Fig. 8 - Fuse locations

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).
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12 Volt DC Fan

A 12 volt DC fan (Fig. 9, 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. 9, B).
The thermostatic switch is located on the fi rst condenser fi n (Fig. 9,
C).
The switch turns the fan on and off. The fan comes on when the
temperature of the fi rst condenser fi n 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. 9, D)
through to connector pins P1-1 (Fig. 9, E) and P1-6 (Fig. 9, F).
F1
F2
NOR000815A

Fig. 9 - Fan wiring

A
B
C
D
E
F
11
If the vehicle has a roof exhaust vent,
NOTICE
you may need to remove the refrigerator
from the enclosure to test the thermostatic
switch. If the vehicle has an upper side-
wall exhaust vent, you are able to test the
thermostatic switch by removing the upper
sidewall vent.
B
C
16 15 14 13 12 11 10 9
P1
8 7 6 5 4 3 2 1
F E
Fan
Thermostatic Switch
Condenser
Auxiliary Wire Harness
P1-1 Auxiliary 12 VDC (ground)
P1-6 Auxiliary 12 VDC (positive)
A
D
SERVICE MANUAL