National Luna LEGACY NL40 User manual

Owner’s Manual
PORTABLE
REFRIGERATION
National Luna
Legacy Single Dome
60mm x 30mm
Translucent blue
Black
White
Metallic silver background
Notes :
Silver foil backing provides metallic effect
on translucent blue.
LEGACY Single Compartment Models:NL40 / 52 / 55 / 65 / 80 /125
LEGACY Dual Control Models: NL50 / 60 / 72 / 90 / 110

National Luna LEGACY Fridge Manual 2
This Manual is a combined publication, for National Luna LEGACY
models manufactured from June 2019 & contains relevant information,
common to all Models.
The National Luna Range of products has been designed
and manufactured in South Africa since 1989.
Every product sold is of the highest possible quality, manufactured
with world-class technology, marketed and serviced by a knowledgeable
and dedicated team both Locally and Internationally.
National Luna Portable Refrigeration Models:
National Luna Single Compartment Models: NL40 / 52 / 55 / 65 / 80 /125
National Luna Dual Control Models: NL50 / 60 / 72 / 90 / 110
PORTABLE
REFRIGERATION
National Luna
Legacy Single Dome
60mm x 30mm
Translucent blue
Black
White
Metallic silver background
Notes :
Silver foil backing provides metallic effect
on translucent blue.
Please complete the tear-out return card to register your warranty or register online:
www.nationalluna.com

National Luna LEGACY Fridge Manual3
Precautions
Congratulations on the purchase of your
National Luna LEGACY Portable Fridge / Freezer.
The National Luna range of portable fridges and freezers are high-performance,
high e󰀩ciency refrigerators ideal for harsh conditions and applications that are
limited to battery power such as o󰀨-road vehicles, caravans and solar installations.
The versatility of each of the National Luna models allows the use of a wide range
of AC supply voltage (85V DC - 265V AC) as well as 12-volt or 24-volt battery power
(9.6V AC - 31.5V DC).
The use of a custom-designed digital thermostat and smart control circuitry
ensures temperature stability and low power consumption.
All refrigerator models are built using high quality materials, unique assembly
techniques and strict testing procedures to ensure the highest level of quality and
performance.
When the refrigerator is used in an automotive application, ensure that it is secured
to prevent accidental movement. The carry handles can be used with straps or
tie-downs if necessary.
• A base mounting plate is optional and recommended for most applications.
• Ensure the correct type of cable and connectors are used for installation.
• Ensure that any power leads connected to the refrigerator will not be pulled or
damaged by any movement of the fridge - especially where slides or drawers are
used.
• Do not use a power lead that is damaged.
• Do not connect the refrigerator to a power source that does not comply with the
input power specications. (Displayed on the fridge’s rear panel)
• When storing the fridge, ensure that the lid is propped open to allow for
breathing. Disconnect the appliance from an electrical source.
(Note: When the fridge is switched o󰀨, the interior light will still function if the
unit is connected to a power source).
• Do not block or cover the ventilation holes. (During o󰀨-road
conditions items may become lodged around the cooling area).
Introduction

National Luna LEGACY Fridge Manual 4
Introduction 3
Getting to know your Portable Fridge
• Securing your Fridge - Base Mounting Plate 6
• Securing your Fridge - Tie-down Straps 6
• Air Flow 6
Installation Guidelines
• Electrical Connections 7
• Fitting an In-line Fuse 7
• Connecting Power 8
• Wiring Specications 8
Battery voltage vs capacity
• Low Voltage Battery Protection (cut-in / cut-out) 9
Operating your Fridge
• Dynamics of Temperature Settings 10
• Thermostat Control 10
• Temperature Guidelines 10
• Celsius / Fahrenheit Conversion Chart 10
Operating your Single Compartment Fridge
(Models: NL40 / 52 / 55 / 65 / 80 / 125)
• Getting to know your portable Fridge 11
• Main Control Panel 12
• On / Off Control 12
• Battery Protection Settings 12
• Smart Compressor Speed Control 13
• Speed Control Setting 13
• Setting the Temperature 14
• Indicator Lights 14
Index

National Luna LEGACY Fridge Manual5
Trouble Shooting
• Indicator Lights 20
• Fault Description 20
• Trouble Shooting 21
General Maintenance
• Removal of Side Cover 22
• Removal of Electronic Compressor Driver 22
• Replacing the DC fuse 22
• Replacing the AC Power Supply 22
• Replacing the Temperature Probe 23
• Cleaning the Condenser / Replacing the Fan 23
• Removing & Replacing the Interior LED Light 23
• Door Seal & Adjustment (Loose latch condition) 24
• Removing & Replacing Multi-cavity Door Seal 24
Care and Cleaning 25
National Luna Warranty
• South Africa Only - 3 Year Comprehensive 26
• International Warranty 27
• Compressor warranty - 8 Year Limited 27
• Safety Precautions 28
• Disposing of your Old Appliance 28
Operating your Dual Control Fridge
(Models: NL50 / 60 / 72 / 90 / 110)
• Single Door 15
• Double Door 15
• Main Control Panel 16
• On / Off Control 16
• Battery Protection Settings 16
• Smart Compressor Speed Control 17
• Speed Control Setting 17
• Setting the Temperature 18
• Minimum Temperature Settings 18
• Indicator Lights 18
Index
Dual-Direction Lid 19

National Luna LEGACY Fridge Manual 6
Air Flow
Spacing 100-200mm
Air Flow
Allow a 100-200 mm gap around the refrigerator
compressor area for ventilation (Airow). The
higher the ambient temperature, the more
ventilation space is required for e󰀩cient
airow and cooling. (In the case of restricted
airow, the compressor will automatically shut
down - see page 21 for Trouble Shooting).
Do not block or cover the ventilation holes.
(During o󰀨-road conditions items may
become lodged around the cooling area).
Getting to know your portable Fridge
The sturdy and functional carry handle
has a slot into which a
hold down strap can be tted
as indicated.
(Care must be taken not to
over-tighten the hold-down strap
when using a ratchet device.)
Securing your Fridge in a vehicle using Tie-Down Straps
A low-prole design with locking pin, this base o󰀨ers a xed mounting position
with an easy to remove mechanism. The optional base mounting plate allows the
refrigerator to be securely fastened to the oor or body of the vehicle.
The unique locking design ensures that
the Fridge remains xed in position.
6mm lock nut
M6 x 20 Flat Washer
Securing your Fridge in a vehicle using a Base Mounting Plate

National Luna LEGACY Fridge Manual7
Electrical Connections
When installing the refrigerator into a vehicle for the rst time, ensure that the
electrical connections to the vehicle’s battery are secure and the specied wiring
is used. (See wiring guidelines on page 8)
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 suitable cables to connect the
female socket to the vehicle’s battery.
(Cable thicknesses of 4mm2or greater
is recommended.)
Centre Pin (+)
• If you choose to change the male plug on the DC cable supplied for a di󰀨erent
type of plug, rst ensure that all power has been disconnected.
• Split and strip the wires as required for the new plug. Take care to ensure that the
correct polarity is used on the new plug and crimp the connections where possible.
Male Plug
Female Socket
Installation Guidelines
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.
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 path.
2x 4mm2
cables to Battery

National Luna LEGACY Fridge Manual 8
This Fridge can accept a DC voltage
ranging from 9.6V to 31.5V, 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 Specications / 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 mm2multi-strand copper wire
per meter of distance from the battery. (minimum 4mm2)
Note: Two wires (positive & negative) must be connected from the battery to the Fridge / plug point.
Cable Size Max Length between
battery & fridge
AWG
Approximate
Cross Section
mm2
12 Volt Operation
Meters
11 4 4
9 6 6
7 10 10
5 16 16
Connecting Power
Installation Guidelines

National Luna LEGACY Fridge Manual9
• Voltage of a battery can be an indication of its “state-of-charge”.
• The voltage-capacity relationship is most accurate when the
fridge is not running and the battery temperature is at 25°C.
• By measuring the voltage, we can estimate the amount of
energy remaining in the battery.
• Changes in temperature, battery age and general battery health
can inuence this relationship and therefore result in inaccurate
capacity measurement.
• Normal battery operation takes place between 12.0 and 12.6 volts.
• Depending on the manufacturer’s specications a normal car’s
alternator charges between 13.7 and 14.2 volts.
• A battery should not be discharged below 11.8 volts as a general
rule. A “deep-discharged” battery should be recharged as soon as
possible to prevent permanent damage.
Low Voltage Battery Protection
The Electronic Control Unit will cut-out at the LOW / MEDIUM / HIGH selected setting.
Once the compressor has cut-out, it will not restart (cut-in) until the voltage rises.
The table below reects the set points.
BATTERY
CAPACITY
BATTERY
VOLTAGE
When using the unit in a 24-volt application
do not select battery protection “LOW”
as this may completely drain the battery bank.
(Causing permanent damage to the batteries)
12 VOLT 24 VOLT
Battery
Protection Cut-out Cut-in Cut-out Cut-in
LOW 9.6 10.9
MED 10.4 11.7 22.8 24.2
HIGH 11.3 12.5 24.6 26.0
Note: these values are measured at the
Electronic Compressor Driver input. It is
important to note that poor / thin wiring
and bad connections to the battery can
cause a large voltage drop. When this
occurs the Fridge switches o󰀨 and will
re-start again on a repeat cycle “hunting”.
NOTE: When connecting the fridge for the rst time, it will look at the cut-in voltage.
• If the battery protection is set on “High” the initial cut in voltage will be 12.5.
• If the battery is not fully charged the Fridge will not start. Simply select “Low” to start.
• When selecting “Low” the Fridge will operate within a voltage supply of 9.6-31.5Vdc.
Battery Voltage vs Capacity

National Luna LEGACY Fridge Manual 10
The compressor is controlled by the digital thermostat. It has a unique Multi - Speed (2,000 - 3,500 rpm)
capability which makes it ideal for use in all mobile applications up to an angle of 35 degrees. It can
function efciently in extreme conditions where it is not uncommon to have ambient temperatures
above 40ºC.
To control temperature, the thermostat sensor must be placed in a position in order to take an accurate
temperature reading.
For practical purposes National Luna has elected to place this temperature sensor behind the metal
surface forming the interior compartment of the Fridge/Freezer. Thus the switching on and off of the
compressor will be controlled by the compartment surface area temperature.
The inner volume of the cooling bin (i.e. core/centre temperature) will take time to “pull down” to
equalise the compartment temperature. (In practice it is common that the set temperature will be within
3ºC of the core temperature).
Ambient temperatures surrounding the Fridge must also be taken into consideration. Very high
ambient temperatures will affect the running time of the fridge. (e.g. The Fridge will run longer to
maintain or reach the target temperature setting.)
3°C to 6°C
0°C to 4°C
-6°C to -11°C
-18°C
Fresh fruits & vegetables
Dairy products
Smoked / prepared meats
Cold beverages
Short-term frozen meats
Frozen meats and sh
Ice cream / frozen desserts
Recommended choice of temperatures
The following table is a guideline to setting the
correct temperature range for different foodstuffs. 60
43
32
12
6
0
-6
-12
-18
-24
-30
140
109.4
89.6
53.6
42.8
32
21.2
10.4
-0.4
-11.2
-22.0
ºC ºF
Temperature Guidelines
Dynamics of Temperature Settings
Operating your Fridge
Celsius vs Fahrenheit
Inner Bin / Cooling Compartment / Thermostat Control
Conversion Chart