Dometic RM2551 User guide

INSTALLATION AND
OPERATING INSTRUCTIONS
REFRIGERATOR FOR LP-GAS AND ELECTRIC OPERATION.
Contents: Page
Installation 4
Operating Instructions 8
Maintenance & Service12
Corporate Office
2320 Industrial ParkwayElkhart,IN46515
USA For Service Center AssistanceCANADA
Service OfficeCall: 800-544-4881 DometicDistribution Inc.
The DometicCorporation 866 Langs Drive
509 South Poplar Street Cambridge,Ontario
LaGrange,IN 46761 N3H 2N7 Canada
Phone:[phone] Phone: [phone]
822 70 91-00 (French 3109294.003)
RM 2551
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.
AVIS
Cet appareil doit être réparé
seulement par un réparateur
autorisé. Modification de
l’appareil pourrait être
extrèmement dangeruse, et
pourrait causer mal ou mort.

Heater
Burner jet
Inlet fitting
Power module
cover
FIG. 2
Refrigerator control panel
AB
12
LEGEND
1.Main Power Button ON/OFF
2.AUTO/GAS Mode Selector Button
A.AUTO Mode Indicator Lamp
B.CHECK Indicator Lamp
(GAS Operation Only)
FIG. 1
Reigniter
Flexible cord
12 Volt
Terminal block Manual gas shutoff valve
Drain water hose
Screw for protection cover
Protection
cover
Flue baffle
3

INSTALLATION
GENERAL INSTRUCTION
This appliance is designed for storage of foods
and storage of frozen foods and making ice.
The refrigerators outlined herein have been design cer-
tified by A.G.A. under the ANSI Z21.19 Refrigerator
Standardforinstallationinamobilehomeorrecreational
vehicle and are approved by the Canadian Gas Asso-
ciation.
The certifications are, however contingent on the instal-
lation being made in accordance with the following in-
structions as applicable.
In the U.S.A., the installation must conform with:
1. NationalFuel GasCode ANSIZ223.1-(latestedition)
2. Manufactured Home Construction and Safety Stan-
dard, Title 24 CFR, Part 3280.
3. Recreational Vehicles ANSI A119.2-(latest edition).
The unit must be electrically grounded in accordance
with the National Electric Code ANSI/NFPA 70-(latest
edition) when installed, if an external alternating current
electrical source is utilized.
4. Any applicable local code.
In CANADA, the installation must conform with:
1. Current CAN/CGA B149 Gas Installation Codes
2. Current CSA Standard Z240.4 GAS-EQUIPPED
RECREATIONALVEHICLESANDMOBILEHOUS-
ING.
3. Where a flexible metal connector is used, it must
comply with the provisions of the current Standard
CAN1-6.10, METAL CONNECTORS FOR GAS
APPLIANCES.
4. Any applicable local code
The unit must be electrically grounded in accordance
with the current CANADIAN ELECTRICAL CODE C22
Parts 1 and 2.
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 for
air supply or for venting of combustion products shall
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
inthisinstructionmanualhavebeencertifiedforusewith
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
opening toward the outside atfloor level inthe refrigera-
tor compartment must be provided for ventilation of
heavier-than-airfuelgases.Thelowerventoftherecom-
mended kits is provided with proper size openings.The
flow of combustion and ventilating air must not be ob-
structed.
The lower side vent is fitted with a panel which provides
an adequate access opening for ready serviceability of
the burner and control manifold of the refrigerator.
CERTIFIED INSTALLATION
Certified installations require one roof vent and one
lower side vent.
For
"Certified Vent System Kits" see page 15.
Forfurtherinformationcontactyourdealeror distributor.
METHODS OF INSTALLATION
The method of installation is shown in FIG. 3. It is
essential that all maximum or minimum dimensions are
strictlymaintainedastheperformanceoftherefrigerator
is dependent on adequate flow of air over the rear of the
refrigerator.
Condenser
Minimum
ventilation
height
FIG. 3
NOTE: The upper vent should be
centered over the condenser coil
at the back of the refrigerator.
4

VENTILATION HEIGHTS
Refer to FIG.3., page 4
Installation with roof Minimum ventilation
vent and lower side vent heights in
Refrigerator Inches mm
RM 2551 44-1/2 1130
CLEARANCES
Minimumclearances 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 3, and 4.
Overall Recess
Refrigerator Dimensions Dimensions
Model Height Width Depth Height Width Depth
ABCHWD
inch 43-1/2 24-7/8 24-11/16 42-5/8 23-11/16 24
RM 2551 mm 1104 632 627 1083 602 610
This method of installation and these clearances will give you adequate space for service and proper installation.
FIG. 4
N
M
K
L
G
NOTE: Wood Strip
MUST be in place
K
FIG. 5
Side view View from above
D
H
D
A
B
W
C
5

INSTALLING REFRIGERATOR IN
ENCLOSURE
NOTE: DO NOT install the appliance directly on
carpeting. Carpeting must be removed or
protected by a metal or wood panel be-
neath the appliance which extends at least
full width and depth of the appliance.
NOTE: A wood strip must be in place across the upper
opening ofthe enclosure.The topframeof the refrigera-
tor will anchored to the wood strip with screws,
see FIG.4.
The refrigerator must be installed in a substantial en-
closure and must be level.When installing the refrigera-
tor 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
applied to the rear surface of the front frame for this
purpose, see FIG. 6. The sealing should provide a
completeisolationoftheappliance’s combustionsystem
from the vehicle interior.
NOTE: Be careful not to damage the sealing strip when
the refrigerator is put in place.
Securing the Refrigerator
Aftertherefrigeratorisputinplace,(ensuringacombus-
tion seal at the front frame), the refrigerator is to be
secured in the enclosure with six screws. The screws
have to be installed in the following order:
STEP1:Twoscrewsinstalledthroughthefrontbase,
which includes the lower front strip installation.
The refrigerator is provided with alower frontstrip (ship-
pedasaloosepart).Thefrontstripistobeattachedafter
the refrigerator is set into the cut-out opening.
1. Install the lower front strip by sliding it under the
bottom hinge plate, as shown in FIG. 7. The hinge
plate can beon the right orleft side dependingon the
door swing.
2. Once the lower front strip is slipped under the hinge,
the part is possible to swing into place as shown in
FIG. 8.
3. Secure the refrigerator and the lower front strip with
two screws:
One screw through the hinge, and on the opposite
side onescrew through the lower front strip. (FIG. 8).
STEP 2: Two screws installed in the top frame.
The top decoration panel must be removed from the
refrigerator before the screws can be installed.
Open the door and gently push the tabs out of thehole
in the hinge with a flat blade screwdriver, (both sides).
See FIG.9
Carefully tilt the top decoration panel and lift up to
remove from top frame. Be careful not to damage the
circuit board and wires.
Install the two screws in the top frame, the holes are
accessible from underneath.
Seal the opening for the screws with aluminum tape.
FIG. 8
3
FIG. 7
1
2
FIG. 6
6

Replacethetopdecorationpanel.Becarefulnottopinch
the wires behind the panel.
Makesurethe tabssnapbackintothe holesin thehinge
plate.
STEP 3: Two screws installed in the rear base.
See FIG.10.
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 and top of the refrigerator greater than 1-1/2
inchesshouldbe blocked.Theheatproducedatthe rear
of the refrigerator will become trapped in this space,
making the top of the refrigerator hot and reduce the
efficiency of the refrigerator.
Drain water hose
A hole must be drilled through flooring see FIG.10.
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
through the floor. Seal around the hose that goes
through thedrilled hole.If a longer hosethan supplied is
required to get the water to drain outside of the vehicle,
the installer will have to supply the extra length of hose.
GAS CONNECTION
Hook-up to the gas supply line is accomplished at the
manual gas valve, which is furnished with a 3/8" SAE
(UNF 5/8" -18) male flare connection. All completed
connections should be checked for leaks with soapy
water.
! WARNING
DO NOT use a flame to check for gas leaks.
The gas supply system must incorporate a pressure
regulator to maintain a supplypressure of notmore than
11 inches water column.
When testing the gassupply system attest pressuresin
excess of 1/2 psig, the refrigerator and its individual
shutoff valve must be disconnected from thegas supply
piping system.
When testing the gas supply system at pressures less
than or equalto 1/2psig, the appliance must be isolated
fromthegas supplypipingsystembyclosing its individual
manual shutoff valve.
In case detailed instructions on the installation and
connection to the gas supply are required, contact your
dealer or distributor.
TESTING LP GAS SAFETY
SHUTOFF
The gas safety shutoff must be tested after the re-
frigerator is connected to the LP gas supply.
To test the gas safety shutoff, proceed as follows:
1. Start the refrigerator according to the instructions
without connecting to 120 volts AC.
2. Check that the gas flame is lit. In AUTO, mode the
AUTO mode indicator lamp (A) is on.
3. Close the manual gas shut-off valve at the back of
the refrigerator. (See FIG. 1).
4. Wait for one minute. The CHECK indicator lamp (B)
should be on, and the flame extinguished.
5. Remove protection cover (see FIG. 1) and open the
manual gas shut-off valve. Do not change anybutton
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 indicates
a defective gas safety shut-off and service is requi-
red.
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.
FIG. 10
Hole for drain water hose
FIG. 9 1
2
7

ELECTRICAL CONNECTION
120 Volts AC Connection
The refrigerator is equipped with a three-prong (ground-
ing) plug for your protection against shock hazards and
should be plugged directly into a properly grounded
three-prong receptacle. DO NOT cut or remove the
grounding prong from this plug. The free length of the
cord is 2 feet and therefore recommended that the
receptacle be located to the left side of the refrigerator
(viewed from the rear) and approximately 6 inches from
the floor (see FIG.11).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.
12 Volts DC Connection
This refrigerator model is not designed for 12 volt DC
operation of the cooling system; however, 12 volt DC
must be supplied to the refrigerator to operate the
controls. Use a minimum of 14 gauge wire between
thebattery and refrigeratortosupplythecontrolvoltage.
The connection is made to the positive (+) and negative
(-) terminals of the terminal block onbackof refrigerator.
(See FIG. 1). Correct polarity must be observed when
connecting to the DC supply.
DO NOT use the chassis or vehicle frameas 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.
The connections must be clean, tight and free from
corrosion.
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.
The tubing in the evaporator section is specifically
sloped 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 vehicle is not moving, liquid ammonia will
accumulateinsectionsof the evaporatortubing.Thiswill
slow the circulation of hydrogenand ammonia gas, orin
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
Before startingtherefrigerator,checkthatallthemanual
gas valves are in the ON position. DO NOT forget the
manual shut-off valve on the rear ofthe refrigerator, see
FIG. 1.
This refrigerator is equipped with a control system,
which can be set to automatically select either 120 volt
AC or LP gas operation (AUTO mode), or if desired LP
gas only (GAS mode).
In both AUTO mode and GAS mode operation, the
temperature is controlledbya factory preset temperature
setting.
The refrigerator controls will work down to 9.6 volt DC.
! WARNING
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
possible that the gasoline fumes could enter
this type of appliance and ignite from the
burner flame, CAUSING A FIRE OR AN EXPLO-
SION.
FOR YOUR SAFETY, when refueling, shut off all
LP gas appliances which are vented to the out-
side.
FIG. 11
6"
120 Volt AC
receptacle
8

START UP INSTRUCTIONS
A. A continuous 12 volt 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. InAUTOmodeoperation,thetemperatureiscontrol-
led by a factory preset temperature setting, on the
energy source selected by the control system.
D. In GAS mode operation, the temperature is control-
led by a factory preset temperature setting.
AUTO MODE
1. PresstheAUTO/GASmodeselectorbutton(2)tothe
DOWN position. The AUTO mode indicator lamp (A)
will illuminate. If 120 volts AC is available, the control
system willselect AC operation. If 120volts ACis not
available,the controlsystemwillautomaticallyswitch
to GAS operation. Within 45 seconds the burner
should be ignited and operating normally.
2. If the CHECK indicator lamp (B) illuminates, the
control has failed to ignite the burner on GAS.
To reset when the CHECK indicator lamp (B) is
illuminated,pressthemain powerON/OFFbutton(1)
to the OFF then ON position.
3. On the initial refrigerator start-up on gas (120 volts
AC is not available), it may take longer than 45
seconds to allow air to be purged from the gas line.
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 require resetting the main power ON/OFF
button(1)threeorfourtimes.Ifrepeatedattemptsfail
tostarttheLPgasoperation,checktomakesurethat
theLPgassupplytanksarenotemptyandallmanual
shutoff valves in the lines are open. If the problem is
still not corrected, contact a service center for assis-
tance.
NOTE: Do not continue to reset GAS operation if the
CHECK indicator lamp continues to be illuminated
after several tries.
4. InAUTOmode operation,thetemperatureiscontrol-
led by a factory preset temperature setting.
GAS MODE
1. MovetheAUTO/GASmodeselectorbutton(2)tothe
UP position. The AUTO mode indicator lamp (A) will
gooff.Within45secondstheburnershouldbeignited
and operating normally.
2. If the CHECK indicator lamp (B) illuminates, the
control has failed to ignite the burner on GAS.
To reset when the CHECK indicator lamp (B) is
illuminated,pressthemain powerON/OFFbutton(1)
to the OFF then ON position.
3. On the initial refrigerator start-up on gas, it may take
longerthan 45secondsto allowairto bepurged from
the gas line. If the refrigerator has not been used for
a longtimeor the LP tankshave justbeen refilled, air
may be trapped in the supply lines. To purge the air
from the lines may require resetting the main power
ON/OFF button (1) three or four times. If repeated
attempts fail to start the LP gas operation, check to
makesurethattheLPgassupplytanksarenotempty
and all manual shutoff valves in the lines are open. If
the problem is still not corrected, contact a service
center for assistance.
NOTE: Do not continue to reset GAS operation if the
CHECK indicator lamp continues to be illuminated
after several tries.
4. In GAS mode the temperature is controlled by a
factory preset temperature 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 control system.
Refrigerator control panel
AB
12
9

DESCRIPTION OF OPERATING
MODES
AUTO MODE
When operating in the AUTO mode, the AUTO mode
indicator lamp (A) will illuminate.
ThecontrolsystemwillautomaticallyselectbetweenAC
and GAS operation with AC having priority over GAS.If
the control system is operating with AC energy and it
thenbecomesunavailable,thesystemwillautomatically
switch to GAS.As soon as AC becomes available again
the control will switch back to AC operation.
Gasoperation(120voltsACisnotavailable).Thecontrol
system will activate the ignition system and will attempt
to light the burner for a period of approximately 45
seconds.If unsuccessful, the CHECK indicator lamp (B)
will illuminate.
To restart an ignition attempt with the CHECK lamp
illuminated or to clear (turn off) the CHECK lamp, press
themainpowerON/OFFbuttontothe OFF and then ON
position. The control system will attempt a new 45 sec-
ond ignition sequence.
If 120 volts AC becomes available while the CHECK
indicator lamp is on, the CHECK lamp will not turn off
until the main power ON/OFF button is pressed to the
OFF then ON position.
GAS MODE
When operating in the GAS mode, the AUTO mode
indicator lamp (A) willbe off.This modeprovides LPgas
operation only.The control system will activate the igni-
tion system and will attempt to light the burner for a
periodofapproximately45 seconds.Ifunsuccessful,the
CHECK indicator lamp (B) will illuminate.
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 45 second 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
require resetting the main power ON/OFF button (1)
three or four times. If repeated attempts fail to start the
LP gas operation, check to make sure that the LP gas
supplytanksarenotemptyandallmanualshutoffvalves
in the lines are open.If the problem is still notcorrected,
contact a service center for assistance.
LIMP MODE OF OPERATION
This control system contains a feature where it will
continue to operate the cooling system in the event of a
failure of a major operating component.
If the control cannot read the temperature sensor and
control to the preset temperature, then the control will
run the cooling unit continuously at the energy source
available.
The refrigerator will continue to operate in this mode
indefinitely or until a new sensor is installed and the
system is reset.
Refrigerator control panel
AB
12
10

HOW TO USE THE REFRIGERATOR
FOOD STORAGE COMPARTMENT
Thefoodstoragecompartmentiscompletelyclosedand
unventilated, which is necessary to maintain the re-
quired low temperature for food storage.Consequently,
foods having a strong odor or those that absorb odors
easilyshouldbecovered.Vegetables,saladsetc.should
be covered to retain their crispness. The coldest posi-
tions in the refrigerator are under the cooling fins and at
the bottom of the refrigerator. The warmer areas are on
theupperdoorshelves.Thisshouldbeconsideredwhen
placing different types of food in the refrigerator.
FROZEN FOOD STORAGE
COMPARTMENT
Quick frozen soft fruits and ice cream should be placed
in the coldest part of the compartment which is at the
bottomofthealuminumliner.Frozenvegetables, maybe
stored in any part of the compartment.
This compartment is not designed for deep or quick
freezing of food. Meat or fish, whether raw or prepared,
can be stored in the frozen food storage compartment
providedtheyarepre-cooledfirstintherefrigerator.They
canbe storedaboutthreetimeslongerinthefrozenfood
compartment as compared to the fresh food compart-
ment.To preventfood fromdrying out, keep itin covered
dishes,containers, plasticbagsor wrappedinaluminum
foil.
Ice cubes can be made in the freezer compartment.
Forfastericemaking,thetraysshouldbeplacedindirect
contact with the bottom of the freezer compartment.
Total Refrigerated Volume 5 cu.ft.
DEFROSTING
Shut off the refrigerator by pressing the main power
ON/OFF button to the UP (OFF) position. Empty the
refrigerator, leaving the drip tray under the finned
evaporator, and the cabinet and freezer doors open.
Defrosting time can be reduced by filling the ice trays
with hot water and placing them in the freezer compart-
ment.
! CAUTION
DO NOT use a hot air blower. Permanent damage
could result from warping the metal or plastic parts.
DO NOT use a knife or an ice pick, or other sharp
tools to remove frost from the freezer compartment.
They can create a leak in the ammonia system.
Whenallfrostismelted,drytheinterioroftherefrigerator
with a clean cloth. Replace all food and turn your
refrigerator back on.
CLEANING
Cleaning the refrigerator is usually done after it is
defrosted or put into storage. To clean the interior liner
of the refrigerator, use lukewarm weak soda solution.
Use only warm water to clean the finned evaporator,
gaskets, ice trays and shelves. NEVER use strong
chemicals or abrasives to clean these parts as the
protective surfaces will be damaged. It is important to
always keep the refrigerator clean.
SHUT- OFF (STORAGE PROCEDURE)
Shut off the refrigerator by pressing the main power
ON/OFF button to the UP (OFF) position.
If the refrigerator will not be in operation for a period of
weeks, it should be emptied, defrosted, cleaned andthe
doors left ajar. The ice trays should also be dried and
kept outside the cabinet.
! WARNING
DO NOT store explosive substances in the refrig-
erator, such as cigarette lighter gas, petrol, ether or
the like.
11

MAINTENANCE & SERVICE
The user should be aware of service that must be
done on a regular schedule to keep the refrigerator
operating properly. The service should only be
performed by a qualified technician who is familiar
with LP gas systems and refrigerators.
1. CARTRIDGE HEATER
The heat necessary for the operation of an absorption
cooling unit is supplied by anelectric heater mounted in
a pocket of the boiler system.
This model is equipped with one electric heater for 120
volt AC.
To replace the heater proceed as follows:
1. Unplug the refrigerator power cord from the 120 volt
AC outlet.
2. Disconnect or shut off the 12 volt power to the
refrigerator.
3. Remove the power module cover see FIG. 1
4. Disconnect the heater leads.
5. With a pair of pliers unfold the lug holding the lid of
the boiler casing and open the lid.
6. Remove some insulation wool so that the heater is
accessible.
7. Turn and lift the heater out of its pocket.
8. Fit the new heater into the pocket.
9. Connect the leads and put on the power module
cover.
10. Reset the insulation and close the lid of the boiler.
2. REFRIGERATOR REMOVAL
Before working on the refrigerator, make sure the AC
voltageandDCvoltageleadsaredisconnected.Shutoff
thegassupply.Disconnectthegassupplylineattherear
of the refrigerator, see FIG. 1. Always use a back up
wrench when loosening and tightening this connection.
Cap the gas supply line, loosen the screws anchoring
therefrigeratortotheenclosureandslidetherefrigerator
out of the compartment.
When replacing the refrigerator make sure that the
sealing strips are properly positioned.
Replacement is the reverse of removal. Check all con-
nections for gas leaks.
Refer to section INSTALLATION, page 4 to 8.
3. PERIODIC MAINTENANCE
To keep your Dometic refrigerator operating efficiently
and safely, periodic inspection and cleaning of several
components once or twice a year is recommended.
A. It is important to keep the area at the back of the
refrigerator clean. Check the lower vent, upper vent
and area between these openings for any obstruc-
tions such as bird/insect nests, spider webs, etc.
Clean the coils on the back of the refrigerator. Use a
soft bristled brush to dust off the coils.
It is important to keep the refrigerator area free from
combustible material, gasoline and other flammable
vapors or liquids.
NOTE: The following maintenance is required once or
twice a year, but should only be done by a qualified
serviceman who is familiar with LP gas systems and
refrigerators.
B. Check all connections in the LP gas system (at the
back of the refrigerator) for gas leaks. The LP gas
supply must be turned on. Apply a non-corrosive
bubble solution to all LP gas connections. The
appearance of bubbles indicates a leak and should
be repaired immediately by a QUALIFIED
SERVICEMAN WHO IS FAMILIAR WITH GAS
SYSTEM AND REFRIGERATORS.
! WARNING
DO NOT use a flame to check for gas leaks.
FIG. 12 BURNER JET
INLET FITTING
BURNER MOUNTING SCREW
THERMOCOUPLE
SPARK ELECTRODE
PRESSURE TEST PORT
MANUAL SHUT OFF VALVE.
SHOWN IN OPEN POSITION
BURNER TUBE
SOLENOID VALVE NUT
GAS EQUIPMENT ASSEMBLY
12

C. Check the control system by connecting/disconnec-
ting 120 volt AC power, start/stop the engine, etc.
Compare the operation with the operation described
in section Operating Instructions.
D. The LP gas pressure should be checked and the
mainregulatorreadjustedifpressureisincorrect.The
correct operating pressure is 11 inches of water
column. The correct place to take the LP gas pres-
sure is at the test port just ahead of the burner jet.
(See FIG. 12).
E. Inspect the flue baffle. It should be reasonably clean
and free of soot. Heavy soot formation indicates
improper functioning of the burner. The flue and
burnerboth requirecleaning inthe followingmanner:
1. Unplug the refrigerator power cord from the 120 volt
AC outlet. (See FIG. 11).
2. Disconnect or shut off the 12 volt power to the
refrigerator.
3. Turnmanual shutoff valveto OFF. (SeeFIG. 1& 12).
4. Remove cover from the burner housing. (See FIG.
1).
5. Disconnect the wire from the high voltage electrode.
6. Remove the burner mounting screw and remove the
burner assembly. (See FIG. 12).
7. Remove the wire and flue baffle from the top of flue
tube. Clean the flue from the top using a flue brush.
Blowing compressedairintothefluewillnotproperly
clean soot and scale out of theflue tube. Replace the
flue baffle.
8. Clean burner tube with a brush. Blow out burner with
compressed air.
9. Before removing burner jet, clean burner areaof soot
andscalethatfellout offluetube.Removetheburner
jet. Soak the jet in wood alcohol and blow it out with
compressed air. Reinstall and tighten burner jet.
NOTE:Thecoloroftheflameshall beclearblue over
the slots of the burner. (See FIG. 13).
! WARNING
DO NOT use a wire or pin when cleaning the burner
jet as damage can occur to the precision opening.
This can cause damage to the refrigerator or create
a fire hazard.
10. Reinstall burner, being careful that the end of the
burner fits into the slot on the burner bracket. Check
to make sure slots are centered under the flue tube
and the thermocouple is positioned properly (tip of
thermocouple extends over two slots of burner).
11. Be sure to reconnect the wire to high voltage elec-
trode. Check the electrode for proper location and
gap. (See FIG. 14).
12. Turn on manual gas shutoff valve and check all
fittings for leaks.
13. Connect 120 volt power cord to the outlet and recon-
nect or turn on the 12 volt DC power.
14. Check LP gas safety shutoff. See page 7.
F. FUSES
The refrigerator is equipped with 2 fuses, one for the
refrigeratorcontrol system, and one for theAC cartridge
heater (see table below).
To replace fuse(s) proceed as follows.
1. Disconnect the wall plug, and the 12 volt wires.
2. Remove the power module cover. See FIG. 1.
3. Snap the fuse out of the fuse holder.
4. Fit a new fuse in to the fuse holder.
5. Replace the power module cover.
Control system 3 Amp
AC heater 5 Amp
TROUBLESHOOTING
The Refrigerator Does Not Cool Properly
A. Burner jet clogged.
Clean. See Section Maintenance & Service, item 3.
Periodic maintenance, Paragraph E. Item 1-14.
B. Check level of refrigerator.
C. Venting problem.
Restriction in air flow across cooling unit.
D. Heavy frost buildup on evaporator fins.
Defrost.
E. Flue baffle not inserted properly in flue tube.
FIG. 14 Electrode
1/8" to 3/16"
(3-5 mm)
Burner tube
FIG. 13
Clear blue color
of flame
13

F. Burner dirty.
Clean. See Section Maintenance & Service, item 3.
Periodic Maintenance, Paragraph E. Item 1-14.
G. LP gas pressure low at burner.
Set main regulator so pressure does not drop below
11 inches water column at pressure test tap.
H. Burner not located properly under flue tube.
Relocate.
I. Burner damaged.
Replace.
J. Odors from fumes.
1. Dislocated burner.
2. Damaged burner.
3. Dirty flue tube.
K. FUSES
1. Refrigerator AC Supply
2. Refrigerator control system
See section Maintenance & Service, Item 3. Periodic
Maintenance, Paragraph F.
NOTE: AVOID SPRAYING WATER THROUGH THE
REFRIGERATORVENTSWHILEWASHINGYOURRV.
All the above instructions are to be followed closely.The
refrigerator is quality-guaranteed. However, we are not
responsible for any failures caused by improper adjust-
ments and unfavorable installation conditions. Contact
service point or distributor service dept. for assistance.
CHANGING DOOR HINGES FROM
ONE SIDE TO THE OTHER
The refrigerator is equipped with a convertible door. To
change the door swing, consult the parts manual for the
Conversion Kit Number. For further information, please
contacttheDometicCorporationlistedonthefrontpage.
INSTRUCTIONS FOR MOUNTING
THE DOOR PANEL
The refrigerator is normally delivered without door pan-
els. Before starting the mounting work, check that the
panel dimensions are in compliance with those given in
the table and the instructions are read thoroughly.
When mounting the panel, proceed as follows:
See figure page 15.
A. Open the door 90 degrees.
On new refrigerators, the decoration strips are taped
inside the door; if installed on the door, remove the
doordecorationstrip(2)byremovingitsthreescrews(1).
B. Insert the vertical edges into the grooves of the door
frame (3).
C. Pushthepaneldownwardsothatthelowerhorizontal
edgeofthepanel(4)isfittedintothebottomgroove(5).
D. Put the decoration strip across the door so that the
gap is covered. Secure the decoration strip with the
three screws removed in Step A (1).
PANEL DIMENSIONS
MAX. THICKNESS 5/32" (4 mm)
REFR.MODEL HEIGHT WIDTH
TYPE MAX. MIN. MAX. MIN.
RM 2551 mm 983 981 527 524
inch 38-11/16 38-5/8 20-3/4 20-5/8
SPARE PARTS
The following list is a list of commonly usedparts which
should be available, if required, from your Dometic
Service Center.
Part No. Description
200 74 19-16/7 Jet, No.43
293 06 97-06/1 Burner
293 03 79-00/9 Electrode
293 26 67-02/1 Baffle
293 30 96-01/4 Spark ignition device
17 37 38-34/5 Heater, 195W, 120V
293 20 52-01/8 Thermocouple
293 25 75-01/8 Door shelf, lower
293 25 76-01/6 Door shelf, 3 pieces
293 26 21-01/0 Box vegetable-
293 26 70-01/7 Handle
293 27 50-02/5 Door reversing kit, right-left
293 27 50-03/3 Door reversing kit, left-right
Contact an authorized service center for
parts and repairs as needed.
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2
1
3
4
5
1
11
11
3
CERTIFIED VENT SYSTEM KITS
Refr. Kit
Model No. Components Drawing
RM 2551 3A Roof Vent 3103633 Base
3103634 Cap
(Both Required)
Lower Side Vent 3102364
3102277
3102970
3102972
3101534
3101782
3101337
For further information, contact your dealer or distributor.
15

RM 2551
MO-FO 9836
16