National Luna Trailboss Series Fridge Manual
National Luna Trailboss Series Fridge Manual
Page 9
Page 8
Electrical Connections
When installing the refrigerator into a vehicle for the first time, ensure that the
electrical connections to the vehicle’s battery are secure and the specified wiring
is used. (See wiring guidelines on page 9)
The fridge is supplied with a power lead for use with a 12 Volt DC supply.
This power lead is terminated with a high-quality male plug for connection into
your vehicle.
1. Install the supplied female
socket into your vehicle
in a convenient location.
2. Use a suitable cable to connect the
socket to the vehicle’s battery.
A cable thickness of 4mm
2
or greater
is recommended.
Centre pin (
+
)
Fitting an in-line fuse
Although the fridge has a built-in fuse, it
is recommended to install an additional
fuse on the positive wire as close to
the battery as possible. This will protect
against short-circuits that may occur
along the length of the cable.
Ensure that all connections are
properly crimped and insulated.
If you choose to change the attached plug on the DC cable for a different type,
first ensure that the power has been disconnected before cutting it.
Split and strip the wires as required for the new plug. Take care to ensure that the
correct polarity is used on the plug and crimp the connections where possible.
An automotive fuse with a rating
of 15A is recommended
When installing electrical outlets in your vehicle, do
not rely on the vehicle’s body for an electrical earth.
Male Plug
Female Socket
This Fridge can accept a DC voltage
ranging from 9.6V to 17V, as well as an
AC voltage range from 85V to 265V.
The 12Vdc power input is protected
with a 15A automotive blade fuse.
An AC and DC source can be connected
to the refrigerator simultaneously. Under
these conditions, the AC supply will be
chosen as the primary power source.
If the AC supply is interrupted, the DC
supply will be automatically selected
and operation will continue normally.
(After a 1 minute delay)
Suggested Wiring Specifications / Guidelines
One of the most problematic issues with installing a 12 Volt refrigeration system
is incorrect wiring. Most users do not understand the importance of maintaining
battery voltage over the distance from the battery to the installed Fridge.
While most car cigarette lighter sockets appear to be adequate, in practise a
large voltage drop occurs between the socket and the car battery. This may
result in the fridge shutting down as a result of a low-voltage condition.
It is recommended the following table be used as a guide to establish what cable
thickness is to be used depending on the distance from the car battery to the
fridge. As a rule of thumb one should use a 1.0 mm
2
multi-strand copper wire
per meter of distance from the battery.
Note: Two wires (positive & negative) must be connected from the battery to the Fridge / plug point.
Cable Size
Max Length between
battery & fridge
Cross Section
mm2
12 Volt Operation
Meters
4
4
6
6
10
10
Connecting power
Installation Guidelines
Installation Guidelines
