9
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 per-
formed 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 an electric heater mounted in
a pocket of the boiler system.
Model RM 2453 and RM 2553 are equipped with two
electrical heaters, one for 230-240 volt AC and one for
12 volt DC.
To replace the heater proceed as follows:
1. Before working on the refrigerator make sure that
230-240 volt AC and optional 12 volt DC leads are
disconnected. Shut off Gas valve.
2. Remove the terminal block cover, see FIG. 1.
3. Disconnect the heater leads.
4. With a pair of pliers unfold the lug holding the lid of
the boiler casing and open the lid.
5. Remove some insulation wool so that the heater is
accessible.
6. Turn and lift the heater out of its pocket.
7. Fit the new heater into the pocket.
8. Connect the leads and put on the terminal block
cover.
9. Reset the insulation and close the lid of the boiler.
2. REFRIGERATOR REMOVAL
Before working on the refrigerator, make sure the AC
voltage and DC voltage leads are disconnected. Shut
off the gas supply at the LP tank. Disconnect the gas
supply line at the rear of the refrigerator, see FIG. 1.
Always use a back up wrench when loosening and tight-
ening connections.
Cap the gas supply line, loosen the screws anchoring
the refrigerator to the enclosure and slide the refrigera-
tor out of the compartment.
When replacing the refrigerator make sure that the seal-
ing strips are properly positioned.
Replacement is the reverse of removal. Check all con-
nections for gas leaks.
Refer to section INSTALLATION, page 2 to 6.
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 ser-
viceman who is familiar with LP gas systems and refrig-
erators.
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 SYS-
TEM AND REFRIGERATORS.
! WARNING
DO NOT use a flame to check for gas leaks.
C. The LP gas pressure should be checked and the main
regulator readjusted if pressure is incorrect. The cor-
rect operating pressure is 2,7 kPa. The correct place
to take the LP gas pressure is at the test port just
ahead of the burner jet. (See FIG. 10).
GAS EQUIPMENT ASSEMBLY
MANUAL SHUT OFF VALVE
Shown in open position
Use a slotted screwdriver to change position
INLET FITTING
NUT
THERMOCOUPLE
SPARK ELECTRODE
BURNER TUBE
BURNER MOUNTING SCREW
BURNER JET
PRESSURE TEST PORT
FIG. 10
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