Dometic NDR 1402 User manual

INSTALLATIONAND
OPERATING INSTRUCTIONS
REFRIGERATOR FOR LP-GAS AND ELECTRIC OPERATION
NDR 1402
USA Corporate Office CANADA
Service Office 2320 Industrial Parkway Elkhart, IN 46515 Dometic Distribution Inc.
Dometic Corporation 866 Langs Drive
509 South Poplar Street Cambridge, Ontario
LaGrange, IN 46761 For Service Center Assistance N3H 2N7 Canada
Phone:[phone] Call:800-544-4881 Phone:[phone]
825 12 23-01
®
®
Contents: Page
Installation 4
Operating Instructions 8
Maintenance & Service 12
FOR YOUR SAFETY
If you smell gas:
1. Open windows.
2. Don’t touch electrical switches.
3. Extinguish any open flame.
4. Immediately call your gas supplier.
FOR YOUR SAFETY
Do not store or use gasoline or other
flammable vapors and liquids in the
vicinity of this or any other appliance.
WARNING: Improper installation,
adjustment, alteration, service or
maintenance can cause injury or
property damage. Refer to this
manual. For assistance or additional
information consult a qualified
installer, service agency or the gas
supplier.
Pour votre sécurité
Si vous sentez une odeur de gaz:
1. Ouvrez les fenêtres.
2. Ne touchez à aucun interrupteur.
3. Éteignez toute flamme nue.
4. Avertissez immédiatement votre fournis-
seur de gaz.
Pour votre sécurité
Ne pas entreposer ni utiliser de l’essence ni
d’autres vapeurs ou liquides inflammables à
proximité de cet appareil ou de tout autre
appareil.
Avertissement: Une installation, un réglage,
une modification, une réparation ou un
entretien non conforme aux normes peut
entraîner des blessures ou des dommages
matériels. Lisez attentivement le mode d’em-
ploi fourni avec l’appareil. Pour obtenir de
l’aide ou des renseignements supplémentai-
res, consultez un installateur ou un service
d’entretien qualifié ou le fournisseur de gaz.

3
Refrigerator control panel
FIG. 2
GAS
AC
ON
OFF
AES
AUTO
CHECK
COLD COLDEST
12345
12 3
AC
BD
E
LEGEND 2-WAY AES Model
1. Main Power Button ON/OFF
2. AES/AUTO/GAS Mode Selector Button
3. Temperature Selector Button
A. AC Mode Indicator Lamp
B. AES/AUTO Mode Indicator Lamp
C. GAS Mode Indicator Lamp
D. CHECK Indicator Lamp
E. Temperature Indicator Lamps
FIG. 1
12V DC
Heaters
Power module
and fuses
Protection cover
Flue baffle
Thermofuse
Burner jet
Manual gas
shutoff valve
Inlet fitting
12 Volt
Terminal block Flexible cord, Refrigerator
Reigniter
Drain water hose

4
INSTALLATION
GENERAL INSTRUCTION
This appliance is designed for storage of foods and
storage of frozen foods and making ice.
This appliance is certified under the latest edition of
ANSI Z21.19•CSA 1.4 Refrigerators using gas fuel.
The installation must conform with local codes, or in
absence of local codes, the following standards as ap-
plicable.
In the U.S. the installation must conform with:
1. National Fuel Gas Code,ANSI Z223.1/NFPA54
(latest edition).
2. Recreational Vehicles Code,ANSIA119.2 (latest
edition)
3. Manufactured Home Construction and Safety
Standard, Title 24 CFR, Part 3280.
If an external electrical source is utilized, the refrigera-
tor, when installed, must be electrically grounded in ac-
cordance with local codes or, in the absence of local
codes,theNational ElectricalCode,ANSI/NFPA70- (lat-
est edition).
In CANADA, the installation must conform with:
1. Natural Gas and Propane Installation Code,
CSAB149.1
2. CSAZ240 RV Series, Recreational Vehicles.
3. Current CSA Z240.4, Gas-equipped Recreational
Vehicles and Mobile Housing.
If an external electrical source is utilized, the refrigera-
tor, when installed, must be electrically grounded in ac-
cordance with local codes or, in the absence of local
codes, the Canadian Electrical Code, CSAC22.1, Parts
Iand II - (latest edition).
VENTILATION
The installation shall be made in such a manner as to
separate the combustion system from the living space
of the mobile home or recreational vehicle. Openings
forairsupplyorforventingofcombustionproductsshall
have a minimum dimension of not less than 1/4 inch.
Proper installation requires one lower fresh air intake
and one upper exhaust vent. The ventilation kits shown
inthisinstruction manual have beencertifiedforuse with
the refrigerator models listed in the table. For “Certified
Vent System Kits” see page 15.
The ventilation kits must be installed and used without
modification.An openingtowardtheoutsideatfloor level
in the refrigerator compartment must be provided for
ventilationofheavier-than-airfuel gases.Thelowervent
of the recommended kits is provided with proper size
openings.Theflow ofcombustionandventilatingair must
not be obstructed.
Thelowersideventisfittedwithapanel,which provides
an adequate access opening for ready serviceability of
the burner and control manifold of the refrigerator. This
should be centered on the back of the refrigerator.
GAS CONNECTION
Hook up to the gas supply line is accomplished at the
manual gas valve, which is furnished with a 3/8" SAE
(UNF5/8"-18) male flareconnection.Allcompletedcon-
nections should be checked for leaks with soapy water.
DO NOT use a flame to check for gas leaks.
Thegassupplysystemmustincorporate apressure regu-
lator to maintain a supply pressure of not more than 11
inches water column.
Whentestingthegassupplysystem at test pressures in
excessof 1/2psi,therefrigeratorand itsindividualshutoff
valve must be disconnected from the gas supply piping
system.
When testing the gas supply system at pressures less
than or equal to 1/2 psi, the appliance must be isolated
from the gas supply piping system by closing its indi-
vidual manual shutoff valve.
In case detailed instructions on the installation and con-
nection to the gas supply are required, contact your
dealer or distributor.
ELECTRICAL CONNECTION
120 Volts AC Connection
Therefrigeratorisequippedwithathree-prong(ground-
ing) plug for your protection against shock hazards and
shouldbepluggeddirectlyintoa properlygrounded three-
prongreceptacle.DONOTcut or remove the grounding
prongfrom this plug.Thefreelengthof the cord is 2 feet
and therefore recommended that the receptacle be lo-
cated to the right side of the refrigerator (viewed from
therear)and approximately 10inchesfrom the floor(see
FIG. 3). This allows easy access through the vent door.
The cord should be routed to avoid direct contact with
the burner cover, flue cover or any other components
that could damage the cord insulation.
! WARNING
FIG. 3
10’’
120 Volt AC
receptacle

5
12 Volts DC Connection
The refrigerator model NDR 1402 require a continuous
12 volt DC supply (even though 2-way models are de-
signed to operate on 120 voltsAC and gas, a 12 volt DC
controlisrequiredtomaintaintheautomaticenergysys-
tem). The connection is made to the positive (+) and
negative (-) terminals of the terminal block on the back
oftherefrigerator.(SeeFIG. 1). Correctpolarity must be
observed when connecting to the DC supply.
Do not use the chassis or vehicle frame as one of the
conductors.
Connect two wires at the refrigerator and route to the
DC supply.
The distance the current must travel from the battery to
the refrigerator dictates the AWG wire size to be used.
Should the wire be too small for the distance, a voltage
drop will result.
Recommended wire sizes are shown below.
Caution: Use care when installing the refrigerator. This
refrigeratorisequippedwiththelatestvacuuminsulated
panel technology. These insulating panels are located
ontheTop,Back,Bottom,SidesandDoorsoftherefrig-
erator.
If the surface is punctured, loss of insulation will occur,
resulting in poor refrigerator performance.
NOTE: A wood strip must be in place across the upper
openingoftheenclosure.Thetopframeoftherefrigera-
tor will be anchored to the wood strip with screws, see
FIG. 10.
The refrigerator must be installed in a substantial enclo-
sure and must be level. When installing the refrigerator
in the enclosure, all areas within the recess in which the
refrigerator is installed must be sealed.
Make sure that there is a complete seal between the
front frame of the refrigerator and the top, sides and
bottom of the enclosure. A length of sealing strip is ap-
plied to the rear surface of the front frame for this pur-
pose, see FIG. 4. The sealing should provide a com-
pleteisolation oftheappliance’scombustionsystem from
the vehicle interior.
NOTE: Be careful not to damage the sealing strip when
the refrigerator is put in place.
The wires from the battery to the refrigerator must be of
large enough size to handle the load. The connections
must be clean, tight and free from corrosion.
INSTALLING REFRIGERATOR IN
ENCLOSURE
The transport support at the rear of the refrigerator can
be removed if necessary for the installation of the refrig-
erator in the enclosure. (See figure above).
NOTE: DO NOT install the appliance directly on
carpeting. Carpeting must be removed or
protectedby a metalor wood panelbeneath
the appliance, which extends at least full
width and depth of the appliance.
Securing the Refrigerator
After the refrigerator is put in place, (ensuring a com-
bustion seal at the front frame), the refrigerator is to be
secured in the enclosure with six screws (not included).
The screws have to be installed in the following order:
STEP1: Two screwsinstalled through thefront base,
which includes the lower front strip installation.
The refrigerator is provided with a lower front strip
(shippedasa loose part).Thefrontstrip istobeattached
after the refrigerator is set into the cutout opening.
1. Install the lower front strip by sliding it under the
bottom hinge plates, as shown in FIG. 5.
MAXIMUM TOTAL CONDUCTOR WIRE LENGTH
(in feet and meters)
Wire length AWG
17 ft. 14
5 m
27 ft. 12
8 m
FIG. 4

6
2. Secure the refrigerator and the lower front strip with
two screws: One screw through each hinge. See
FIG 6.
Step 2: Two screws installed in the top frame.
Open the doors and fasten the refrigerator with two
screwsthroughtheholesunderneaththetop decoration
panel. See FIG. 7.
Failure to follow the sequence in securing refrigerator in
enclosure can cause leakage between the frame and
cabinet.
Any space between the counter, storage area or ceiling
andtop ofthe refrigeratorgreaterden1-1/2inches should
be blocked. The heat produced at the rear of the refrig-
eratorwillbecometrappedin this space, making the top
of the refrigerator hot and reduce the efficiency of the
refrigerator.
Drain water hose
Ahole must be drilled through flooring see FIG. 8.
The hole must be drilled in the cut out opening of the
base plate at the rear of the refrigerator. The installer
MUST make sure that the hose does not kink when run
throughthe floor. Sealaroundthehose thatgoesthrough
thedrilledhole. If a longer hosethansuppliedisrequired
to get the water to drain outside of the vehicle, the in-
staller will have to supply the extra length of hose.
TESTING LP GAS SAFETY
SHUTOFF
The gas safety shutoff must be tested after the re-
frigerator is connected to LP gas supply.
To test the gas safety shutoff, proceed as follows:
1. Start the refrigerator according to the instructions,
and switch to GAS mode. (See start up instruc-
tions).
2. Check that the gas flame is lit and the GAS mode
indicator lamp (C) is on.
3. Close the manual gas shutoff valve at the back of
the refrigerator. (See FIG. 1).
4. Wait for one minute. The CHECK indicator lamp
(D) should be on and the GAS mode indicator lamp
(C) should be off.
5. Remove protection cover (see FIG. 1) and open
the manual gas shutoff valve. Do not change any
button positions on the control panel. Apply a non-
corrosive commercial bubble solution to the burner
jet orifice.
6. No bubbles should appear at the opening of the
burner jet orifice. The presence of bubbles indi-
cates a defective gas safety shutoff, and service is
required.
7. If no bubbles were present at the burner jet orifice,
it should be rinsed with fresh water. Be careful not
to damage the burner jet orifice. Replace cover and
press the main power ON/OFF button (1) OFF and
back ON. Normal operation of the burner should
return.Allow the burner to operate for a minimum
of five minutes.
STEP 3: Two screws installed in the rear base.
See FIG. 8.
FIG. 5
FIG. 6
FIG. 7
FIG. 8
Hole for drain
water hose

7
CERTIFIED INSTALLATION
Certifiedinstallationsrequireoneroof ventandone lower
side vent.
For “Certified Vent System Kits” see page 15.
Forfurtherinformationcontactyour dealer or distributor.
METHODS OF INSTALLATION
Themethodofinstallationis shown in FIG.9.Itisessen-
tialthatallmaximumorminimumdimensionsarestrictly
maintained as the performance of the refrigerator is de-
pendent on adequate flow of air over the rear of the re-
frigerator.
NOTE: The upper vent should be centered over the
condenser coil at the back of the refrigerator.
VENTILATION HEIGHTS
CLEARANCES
Minimum clearances in inches to combustible materials
are:
G: Top 0
K: Side 0
L: Bottom 0
M: Rear 0
N: See NOTE: Clearance “N”below.
NOTE: Clearance “M”is between the rearmost part of
the refrigerator and the wall behind the refrigerator.
NOTE: Clearance “N”is the distance between the bot-
tom of the lower vent to the roof material. For ventilation
height, see table VENTILATION HEIGHTS
See Figures 9, and 10.
LOWER VENT CUTOUT
13-5/8”
28-5/8”
FIG. 9
Ventilation
height
Condenser
FIG. 10
Installation with roof Minimum ventilation
vent and lower side vent heights in:
Refrigerator Inches mm
NDR 1402 69-1/8 1756
K
L
NOTE: Wood Strip
MUST be in place
G
KNM

8
OPERATING
INSTRUCTIONS
IMPORTANCE OF LEVELING A
REFRIGERATOR
In an absorption refrigerator system, ammonia is lique-
fied in the finned condenser coil at the top rear of the
refrigerator. The liquid ammonia then flows into the
evaporator (inside the freezer section) and is exposed
to a circulating flow of hydrogen gas, which causes the
ammonia to evaporate, creating a cold condition in the
freezer.
When starting this refrigerator for the very first time, the
cooling cycle may require up to four hours of running
time before the cooling unit is fully operational.
Thetubing intheevaporatorsection isspecificallysloped
to provide a continuous movement of liquid ammonia,
flowing downward by gravity through this section. If the
refrigerator is operated when it is not level and the ve-
hicle is not moving, liquid ammonia will accumulate in
sections of the evaporator tubing. This will slow the cir-
culation of hydrogen and ammonia gas, or in severe
cases, completely block it, resulting in a loss of cooling.
Any time the vehicle is parked for several hours with the
refrigerator operating, the vehicle should be leveled to
prevent this loss of cooling. The vehicle needs to be
leveled only so it is comfortable to live in (no noticeable
sloping of floor or walls).
When the vehicle is moving, the leveling is not critical,
as the rolling and pitching movement of the vehicle will
pass to either side of level, keeping the liquid ammonia
from accumulating in the evaporator tubing.
OPERATION
Beforestartingthe refrigerator, checkthatallthemanual
gas valves are in the ON position. DO NOT forget the
manual shutoff valve on the rear of the refrigerator see
FIG. 1.
This refrigerator is equipped with an Automatic Energy
Selector (AES) control system, which can automatically
select the most suitable energy source which is avail-
able, either 120 Volt AC, or LP gas operation. The sys-
tem can be set by the user to be fully automatic, or if
desired, LP gas only. The refrigerator controls will work
down to 9.6 volt DC.
Most LP gas appliances used in recreational ve-
hicles are vented to the outside of the vehicle.
When parked close to a gasoline pump, it is pos-
sible that the gasoline fumes could enter this
type of appliance and ignite from the burner
flame, CAUSING A FIRE OR AN EXPLOSION.
FOR YOUR SAFETY, when refueling, shut off all
LP gas appliances which are vented to the out-
side.
! WARNING
Overall Recess
Refrigerator Dimensions Dimensions
Model Height Width Depth Height Width Depth
ABCHWD
inch 64-17/64 33-11/16 29-5/8 63-3/16 32-3/4 26-1/16
NDR 1402 mm 1632 855 752 1605 832 662
This method of installation and these clearances will give you adequate space for service and proper installation.
FIG. 11 Side view View from above
D
HA
D
W
C
B

9
THERMOSTAT
The thermostat on the refrigerator controls both the gas
and electric operation, thereby eliminating the neces-
sity of resetting each time a different energy source is
employed.
Aftertheinitialstart-up,thethermostat should be moved
from “COLDEST”to the desired temperature setting,
usually at mid setting.
TO SHUT OFF THE REFRIGERATOR
The refrigerator may be shut off while in any mode of
operation by pressing the main power ON/OFF button
to the UP (OFF) position. This shuts off all DC power to
the refrigerator, including the interior light.
START UP INSTRUCTIONS
A. Acontinuous12volt DC supply must be available for
the electronic control to function.
B. Press the main power ON/OFF button (1) to the
DOWN position.
C. Press the TEMPERATURE SELECTOR button (3)
until the lamp at the desired setting is illuminated.
AES/AUTO MODE
1. Press theAES/AUTO/GAS mode selector button (2)
to turn ON the AES/AUTO lamp (B). If 120 volts is
available, theAC mode indicator lamp (A) will illumi-
nate indicating AC operation. If 120 volts AC is not
available, the GAS indicator lamp (C) will illuminate
indicating the control has automatically switched to
the GAS mode.
2. If the CHECK indicator lamp (D) illuminates and the
GASmodeindicator lamp (C) isoff,thecontrolshave
failed to ignite the burner in the GAS mode. GAS
operation may be reset by pressing the main power
ON/OFFbutton(1) totheOFFthen ONposition.(See
step 2 under GAS MODE).
3. Press the TEMPERATURE SELECTOR button (3)
until the lamp at the desired position is illuminated.
GAS MODE
1. Press the AES/AUTO/GAS mode selector button (2)
toturnOFF the AES/AUTO lamp(B).TheGAS mode
indicator lamp (C) will illuminate. Within 45 seconds
the burner should be ignited and operating normally.
2. On the initial refrigerator start-up, it may take longer
than 45 seconds to allow air to be purged from the
gas line. If the gas does not ignite within 45 seconds
the CHECK indicator lamp (D) will illuminate and the
GAS mode indicator lamp (C) will go off.
To reset when the CHECK indicator lamp (D) is illu-
minated, press the main power ON/OFF button (1)
to the OFF and then ON position.
NOTE: Donot continue to reset GAS operation if the
CHECK indicator lamp continues to be illuminated
after several tries.
3. Press the TEMPERATURE SELECTOR button (3)
until the lamp at the desired position is illuminated.
DISPLAY PANEL
GAS
AC
ON
OFF
AES
AUTO
CHECK
COLD COLDEST
12345
12 3
AC
BD
E

10
DESCRIPTION OF OPERATING
MODES
AES/AUTO MODE
Whenoperating intheAES/AUTO mode,theAES/AUTO
mode indicator lamp (B) will illuminate. The control sys-
tem will automatically select between AC and GAS op-
eration with AC having priority over GAS. Either the AC
indicator lamp (A) or the GAS indicator lamp (C) will
illuminate depending on the energy source selected by
the control system. If the control system is operating
with AC energy and it then becomes unavailable, the
system will automatically switch to GAS. As soon as AC
becomes available again the control will switch back to
AC regardless of the status of GAS operation.
GAS MODE
WhenoperatingintheGASmodetheAES/AUTOmode
indicator lamp (B) will be off and the GAS mode indica-
tor lamp (C) will be illuminated. This mode provides LP
gas operation only. The control system will activate the
ignition system and will make three attempt to light the
burner for a period of approximately 45 seconds with
two minutes interval. If unsuccessful, the CHECK indi-
cator lamp (D) will illuminate and the GAS mode indica-
tor lamp (C) will turn off.
To restart GAS operation, press the main power ON/
OFF button (1) to the OFF and then ON position. The
control system will attempt a new ignition sequence.
If the refrigerator has not been used for a long time or
the LP tanks have just been refilled, air may be trapped
in the supply lines. To purge the air from the lines may
requireresetting themain powerON/OFFbutton(1)three
orfourtimes.IfrepeatedattemptsfailtostarttheLPgas
operation, check to make sure that the LP gas supply
tanks are not empty and all manual shutoff valves in the
lines are open. If the problem is still not corrected, con-
tact a service center for assistance.
IfthecontrolisswitchedtoACoperationwhiletheCHECK
indicator lamp is on, it will function properly, but the
CHECKindicatorlamp willnotgooffuntilthe mainpower
ON/OFFbuttonispressedto the OFF then ON position.
LIMP MODE OF OPERATION
This control system contains a feature where it will con-
tinue to operate the cooling system in the event of a fail-
ureof amajoroperating component.Two differentmodes
of operation can occur in this category.
Iffor somereasonthe displaymodulebecomesnonfunc-
tional, the control system will revert to full automatic
operationselectingthe bestenergysourceavailable with
AC, GAS priority. The temperature of the refrigerator
willbemaintainedat the MID position withinnormaltem-
perature tolerances. The power module will continually
attempt to reestablish operation of the display module.
The second limp mode of operation will execute when a
failure of the temperature sensing device or associated
electronic circuitry occurs. If this should occur, the con-
trol system will operate on the energy source selected
via the control panel. The cooling unit will run continu-
ously on the selected energy source. The refrigerator
will continue to operate in this mode indefinitely or until
a new sensor is installed and the system is reset.
DISPLAY PANEL
E
GAS
AC
ON
OFF
AES
AUTO
CHECK
COLD COLDEST
12345
12 3
AC
BD