Dometic RM182B Service Manual Download Page 5

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General Instructions

Sealed Combustion Unit

The sealed conbustion unit is mode up of the burner, a fresh air intake and exhaust pipes, and o vent/oir-intoke
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 drown in one pipe and combusted gases ore safely vented to
the outside through the other pipe.

Ventilator (Cooling Fan)
In order to improve the cooling performance under the difficult built-in situation and high ambient temperatures, o
o,6 W ventilator is switched on automatically when the temperature around the condenser fins (behind the refri-
gerator) reaches 140 F and switched off at 124 F.

NOTE:
The ventilator is connected to the 12 V-circuit in such o manner that it is also operational during the 120 V and
gas operations.

Fuse
For 12 V use the refrigerator is protected by o fuse installed in the general electrical circuit of the vehicle. If the
fuse bums out, trace the cause and correct it before fitting o new lo amp. fuse.

Steps To Take When The Refrigerator Has Not Been Used For A Long Period
If there has been o heavy rain, or the vehicle has been through o car wash, water may hove collected in the
burner housing. This must be_ removed before the gas is lit. For this, the sealing plug underneath the front of the
refrigerator 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 o 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 con be caused by a poor seal between the slide for ventilation housing
"E" (Fig.2) and the side wall of the vehicle.
When properly sealed, this plate acts as o baffle to protect the exhaust outlet 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 con be caused by failure to tighten the mount "D" (Fig. 2) screws properly, o bad gasket "F" (Fig.2)
or o warped locating plate "E" (Fig. 2).

Periodic Maintenance
Once or twice o year, depending on use, it is necessary to clean and adjust the burner assembly.
The burner is fitted with o # 24 jet, which is suitable for use on Propane or Butane gas at o supply pressure of 11
inches water column pressure. The orifice in the jet is very small and must never be cleaned by means of o pin
or o 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 connections with soapy water, not with on
open flame.