Dometic RM182B - Manual (Page 5)

General Instructions
Sealed Combustion Unit
The sealed canbustion unit is made up of the burner, a fresh air intake and
exhaust pipes, and a vent/air-intake assembly in the wall.
The burner unit is completely sealed off’ from the interior of the van by means
of the two special inlet and outlet pipes. In the vent /air-intake assembly,
fresh air is drawn in one pipe and combusted gases are safely vented to the
outside through the other pipe.
Ventilator (Cooling Fan)
In order to improve the cooling performance under the difficult built-in situ-
ation and high ambient temperatures, a o,6 W ventilator is switched on auto-
matically when the temperature around the condenser fins (behind the refri-
gerator) reaches F and switched off at 124 F.
NOTE:
The ventilator is connected to the 12 V-circuit in such a manner that it is
also operational during the 120 V and gas operations.
Fuse
For 12 V use the refrigerator is protected by a fuse installed in the gene-
ral electrical circuit of the vehicle. If the fuse bums out, trace the cause
and correct it before fitting a new lo amp. fuse.
Steps To Take When The Refrigerator Has Not Been Used For A Long Period
If there has been a heavy rain, or the vehicle has been through a car wash,
water may have collected in the burner housing. This must be_ removed before
the gas is lit. For this, the sealing plug underneath the front of the refri-
gerator on the left is unscrewed from the drainage tube and the water is
allowed to escape. The sealing plug must then be carefully refitted since a
good seal is essential for the proper function of the combustion system._ Check
that the windscreen of the outside wall of the van is clean and remove any
dirt that is present.
Pilot Outage
It has been determined that this problem can be causedbya poor seal between
the slide for ventilation housing "E" (Fig.2) and the side wall of the ve-
hicle.
When properly sealed, this plate acts as a baffle to protect the exhaust out-
let tube from direct air flow. If this seal is not complete, air will be
allowed to flow between the plate and the side wall of the vehicle directly
into the exhaust outlet tube.
This problem can be caused by failure to tighten the mount "D" (Fig. 2) screws
properly, a bad gasket "F" (Fig.2) or a warped locating plate "E" (Fig. 2).
Periodic Maintenance
Once or twice a year, depending on use, it is necessary to clean and adjust
the burner assembly.
The burner ist fitted with a # 24 jet, which is suitable for use on Propane
or Butane gas at a supply pressure of 11 inches water column pressure. The
orifice in the jet is very small and must never be cleaned by means of a pin
or a similar instrument for this will damage the orifice. Should, for
some
reason, the jet require cleaning, it should be washed in alcohol and blown
dry with air.
The entire gas installation should be checked for leaks. Test all pipe connec-
tions with soapy water, not with an open flame.
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