When the opening has been made in the caravan wall, the extension
tube (F) may need to be shortened to suit the particular installation. To
determine if this is necessary, fit the flue top (G) to the top of the
central tube of the boiler casing and secure it by means of the screw
(H).
Place the refrigerator into position, then insert the free end of the
extension tube through the wall of the caravan and over the outlet of
the flue-top as far as it will go. Measure the length 'X' (fig. 9) of any
tube protruding from the outside. Transfer this measurement to the
other end of the tube as shown at 'Y' (fig. 9) and cut at right angles
through the tube at this point to shorten the tube to the correct length.
Note 1. If the caravan wall is not vertical or is contoured in the vicinity of the flue outlet, it may be
necessary to make a packing piece from metal or other non-combustible material, of a suitable shape to
ensure that, when in position, the plate on the flue outlet is parallel with the back of the refrigerator.
Note 2. It is not advisable to lengthen the flue venting arrangement for more than a short distance as this
may result in the flue gasses becoming prematurely cooled and water vapour (which is produced during
the natural process of combustion) condensing in the flue and running back into the boiler insulation and
burner.
At this stage, refer to items 10 and 11 in order to prepare for the 12V and
bottled gas connections. When these have been made, before finally
positioning the flue extension tube (F), ensure that the portion passing
through the wall of the vehicle is surrounded by non-combustible material
as shown in fig. 7.
Use a 'soft sealing compound between the flange of the flue outlet and the
wall of the caravan to prevent ingress of rain water.
Fit the outer cover (8) by means of 4 screws.
It will be necessary to remove the outer cover and withdraw the extension tube before the refrigerator can
be moved out of position at any time.
10. ELECTRICAL INSTALLATION
On model RM123, the boiler of the cooling unit is fitted with
two separate heaters, rated at 75W, for use on 230V a.c.
mains electricity, and the 12V battery in the car when the
caravan is on tow.
Model RM 122 does not have a 230V heater fitted.
The electrical installation must be carried out in a
proper and durable manner, taking into account all relevant
regulations and codes of practice. For mains voltage
operation, it is important that the circuit to and in the
caravan is effectively earthed. All mains voltage Wiring in
the caravan must be installed in accordance with current
IEE Regulations including the use of an outlet and coupler
to BS 4343/CEE 17.
a) Wiring for Electronic Igniter (where fitted)
The electronic igniter for the gas burner is for permanent
connection to a 12V d.c. supply, e.g. a car battery.
In a motor-van, the igniter can be connected directly to the
vehicle's main battery or to an existing 12V circuit in the
vehicle which will remain on continuously and will not be
switched off when the engine is switched off. In a caravan,
in order to maintain the supply when the towing vehicle is
unhitched, the igniter must be connected to an auxiliary battery in the caravan. The current drain of the
igniter is negligible therefore the battery can be one that is also used for operating other equipment in the
caravan such as the water pump, lights, etc.
Connect the igniter terminal block (fig. 11) to the battery, ensuring that correct polarity is observed - the
terminals marked'+' and'-'must be connected to the similarly marked terminals of the battery. The wire
used for connecting should be at least 0.5mm2 in cross-sectional area and a 0.5 or 1.0 amp inline fuse
should be fitted in the feed wire, as near to the battery as possible.
Summary of Contents for RM 122F
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