Dometic RM 123E - Manual (Page 9)

9
In a caravan on tow, the usual continuous rolling and pitching motion,
even on long hill climbs, will not normally cause the operation of the
cooling unit to be affected unduly, but when the caravan is at rest for
more than about half an hour, a list of more than about 3º in any
direction may interfere with the operation. (Note: 3º corresponds to
about 50 mm at the end of a metre-long plum-line, or 1 1/2" at the
end of a 30" plumb-line). If the list does not exceed 8º, cooling is
usually resumed when the refrigerator returns to the upright position,
but if it does exceed 8º, the burner should be extinguished or the
electricity supply disconnected, as applicable, soon after the list has
occurred otherwise the cooling unit may become damaged due to
overheating of the boiler.
When the caravan is to be at rest for a period, with the
refrigerator operating, the caravan should be levelled, in both
directions, so that the refrigerator is level. This can be checked
with a small spirit level placed on the ice-tray shelf inside the
refrigerator, viewed from above with the aid of a small mirror. If it is
not convenient to level the vehicle and it is to stand out of level for
more than half an hour, the refrigerator should be temporarily turned
off.
Note:-Having checked initially that the refrigerator has been installed
level in both directions in relation to the caravan, you may find a more
accessible flat surface on which to place the spirit level during future
levelling operations. A position on the caravan draw-bar, for instance,
for placing (or permanently fixing) a 2-way or circular spirit level,
where it may be viewed whilst adjusting the jockey wheel height, will
be an aid to speedy levelling of the caravan and, therefore, the
refrigerator.
15. GAS PRESSURE
Before using the refrigerator on bottled gas check that the types of
gas pressure regulator that you intend to use are compatible with the
size of burner jet and gas control valve fitted to the refrigerator.
16. STARTING THE REFRIGERATOR (see fig. 14)
Before using your refrigerator for the first time, it is advisable to wash
the interior and its accessoiries as described later under 'Cleaning'.
The bottled gas equipment includes a Piezo crystal lighting device
which creates a spark over the burner when the button (5) is pushed
in fully. No batteries or flints are required to operate this lighter.
Before starting the refrigerator, always check that the
alternative method of operation is 'off' as the refrigerator should
not be operated by both means at the same time. If the caravan
is to be stationary for a period, check that the refrigerator is
level.
When turning the gas control knob (4) from one position to another,
the knob must first be pushed in.
Lighting the Burner
1. Ensure that gas is available from the bottle and turn on any
taps in the supply line to the refrigerator.
2. Open the refrigerator door to give easier access to the gas
controls.
3. Turn the gas control knob (4) to the maximum position (No. 3)
then press in this knob for about 5 to 10 seconds to clear air
from the pipeline. (When starting initially, or after changing a
gas bottle, it may be necessary to press in the knob for a
longer period to clear all the air from the pipes).
4. Still pressing in the knob (4), push in the button (5), which
operates the Piezo igniter, several times in quick succession
until the burner lights. Continue to press in the gas control
knob (4) for a further 15 seconds to allow time for the
thermocouple tip (over the burner) to heat up.
5. Release the gas control knob then check that the burner is
alight by looking in the flame control tube. If the burner has
not lit, repeat the lighting procedure.
Note:-The refrigerator has a flame failure device which will
automatically shut off the gas to the burner if the flame is blown
out. While the knob (4) is being pressed in, this device is
temporarily inoperative.
Lighting the Burner (Models with Electronic Igniter)
For models fitted with the electronic ignition system follow Item 16
up to point 2 then proceed as follows:-
3. Switch on the electronic igniter switch (5) by pushing in the
right-hand end against the symbol 'I'. The light in the switch
should start flashing, indicating that sparking is taking place.
4. Turn the gas control knob (4) to the maximum position (No. 3)
then press in this knob and keep it held in.
5. When the burner lights, the neon light in the switch will stop
flashing and go out. When this happens, keep the knob (4)
held in for a further 15 seconds dir the thermocouple over the
burner to heat up, then release the button. If the light in the
switch starts flashing again, it indicates that the flame has
gone out. In this case, repeat operation No. 5.
6. When the burner has lit, leave the igniter switch in the 'On'
position. If the flame goes out, due to a gust of wind for
instance, the igniter will then immediately start sparking and
re-light the burner.
Note: If the burner does not re-light within about a minute,the
flame failure device will operate and shut off the flow of gas
to the burner. The neaon light in the switch will still continue
to flash, however, to alert you that something is wrong or that
tha gas bottle is empty.
Emergency Lighting Procedure for Gas Burner
Although the electronic igniter is primarily designed for
connection to a 12V car battery, it will operate from a 9V dry cell.
If the recommended car battery connection is not available, the
burner can be lit by using a type PP3, PP7, PP9, or equivalent
battery, as used for radios, etc. If using this method, '+' and '-'
polarity must be observed otherwise the igniter will not operate.
Fig. 14
Fig. 14a
5
4
2
4
5
3