Dometic RM2553 - Manual (Page 12)

12
MAINTENANCE & SERvICE
REPLACING ThE 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.
The refrigerator is equipped with two electrical heaters, one
for 230-240 V AC and one for 12 V DC.
To replace the heater proceed as follows:
Unplug the refrigerator power cord from the 230-
240 volt AC outlet. Disconnect the optional 12 V
DC leads.
Shut off gas valve.
Remove the terminal block cover.
Disconnect the heater leads.
With a pair of pliers unfold the lug holding the lid
of the boiler casing and open the lid.
Remove some insulation wool so that the heater is
accessible.
Turn and lift the heater out of its pocket.
Fit the new heater into the pocket.
Connect the leads and put on the terminal block
cover.
Put back the insulation and close the lid of the
boiler.
PERIODIC MAINTENANCE
Checking the connections
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.
Checking the LP gas pressure
The LP gas pressure should be checked and the main regula-
tor readjusted if pressure is incorrect. The correct operating
pressure is 2,7 kPa. The correct place to measure the LP gas
pressure is at the test port just ahead of the burner jet.
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
Cleaning the flue and burner
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 burner both require cleaning in the following
manner:
Unplug the refrigerator power cord from the 230-
240 volt AC outlet.
Disconnect or shut off the 12 volt DC power to the
refrigerator.
Turn manual shutoff valve to OFF.
Remove cover from the burner housing.
Disconnect the wire from the high voltage elec-
trode.
Remove the burner mounting screw and remove
the burner assembly.
Remove the wire and flue baffle from the top of
flue tube.
Clean the flue from the top using a flue brush.
Blowing compressed air into the flue will not prop-
erly clean soot and scale out of the flue tube.
Replace the flue baffle.
Clean burner tube with a brush. Blow out burner
with compressed air.
Before removing burner jet, clean burner area of
soot and scale that fell out of flue tube. Remove
the burner jet.
Soak the jet in wood alcohol and blow it out with
compressed air. Reinstall and tighten burner jet.
The colour of the flame
shall be clear blue over the
slots of the burner.
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
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.
WARNING !
Clear blue colour
of flame

Service and maintenance must be done on a regular schedule to keep the refrigerator operating properly, efficiently and safely.
The service should only be performed by a qualified technician who is familiar with LP gas systems and refrigerators.
GAs equIpMenT AsseMbly
MANUAL ShUT OFF VALVE
Shown in open position
Use a slotted screwdriver to change position
iNlET FiTTiNG
PRESSuRE TEST PORT
buRNER jET buRNER MOuNTiNG ScREw
buRNER TubE
SPARk ElEcTRODE
NuT
ThERMOcOuPlE