Alde COMFORT 2923 Montageanleitung Seite 10

where a six-pole terminal block is fitted. Use the accom-
panying terminal plug and the four spade connectors.
From the battery, a 1.5 mm
from the room thermostat a 1 mm
should be made to a 12-volt car battery or to a special
battery eliminator. The connection should be made in
accordance with fig 10.
230 volts (immersion heater only)
The immersion heater must always be connected to
a 230-volt earthed socket. Permanent installation of a
230-volt wallsocket must be made. Keep cables clear of
immersion heater body.
WARNING: 230 volts must be well shielded from 12
volts.
Fig 10.
A. Terminal block
B. Cut-out 1 amp fuse
C. Room thermostat
D. Battery 12 volts
E. The boiler from above
3:0 Fitting the heating system
In order to obtain the best effect from the heating system,
the radiators should be fitted along the outer walls and
under the windows. In order to obtain good air circulation
(fig 11) and correct heat emission, fresh air should be able
to pass between bed bases, floor and back cushions and
outer walls (see fig 12). It is therefore extremely important
that air gains free access to the radiators, as these are
to supply the majority of the heat to be distributed inside
the caravan. If no holes are made for air gaps as per fig
13, the radiators will not be able to emit sufficient heat,
which will lead to a sharp fall in temperature at windows
and outer walls, leading to condensation.
Installation should be carried out using Ø 22 mm pipe
and any type of radiator. Radiators constructed of copper
piping are most efficient. Every metre of radiator has a
heat emission of about 400 watts. Pipes and radiators
must not be placed higher than the bottom of the boilerʼs
expansion vessel. If there are upper alcoves in vehicles,
The boiler must be raised on a plinth se fig 12.
How many metreʼs of radiator are required in the cara-
van?
The most important thing is to have a radiator under
each window that is slightly longer than the window. A
useful guide is the length of the caravan legth x 1.5 =
the number of metres of radiators, but the greater the
length of radiator, the better and more even the heat
distribution. This allows a lower system temperature in
the boiler for the same heat emission. This saves gas and
provides a more pleasant heat. The pipes should be run
horizontally and air screws should be located at suitable
places where air cannot escape by itself, e.g. if the pipe
is run over the wheel housing (see fig 12 E). In vehicles,
if there is a sleeping alcove above the driverʼs cab, it is
very important to locate air screws at the highest point.
All curves should be as gentle as possible, otherwise
circulation is obstructed.
10
GB
cable should be used and
2
cable. The connection
2
Make sure that radiators and pipes are properly attached
with brackets. As a connection between radiators and
pipes, short rubber connections made of special rub-
ber should be used. The rubber connections should be
secured with wire clips. A sealant between the rubber
connections, Permatex Form-a-Gasket no. 3 should be
used. A draining valve should be fitted to the lowest point
of the pipe (see fig 12 F).
NB. Aluminium and copper must not be mixed in the
heating system, because the copper corrodes the
aluminium. It is even very important not to use the
same equipment for cutting and handling copper and
aluminium. If a copper shaving, for example, gets into
an aluminium pipe, it will almost certainly give rise
to a hole in the pipe.
Fig 11
A. Air flow
B. Radiators
Fig 12
A. Circulation flow
B. Circulation return
C. Ventilation duct
D. Radiator
E. Air nipple
F. Drain cock
G. Room thermostat
3:1 Connection to the heating sys-
tem
The LPG boilerʼs connections to the heating system
are located on the rear of the boiler. Use the same rub-
ber connections, clips and sealant as for the rest of the
system.
LPG boiler with water heater type 2959 and immersion
heater should be fitted in accordance with fig 14.
Figs 14
A. Flow radiator water
B. Return radiator water
3:2 Filling the heating system
The heating system must be filled with a liquid mixture
consisting of 60% water and 40% glycol. Use high quality
glycol that is designed for heating systems and contains
inhibitors. If the heating system is exposed to tempera-
tures lower than -25 °C, the glycol percentage is to be
increased, but it should not exceed 50%.
Vessels used to handle the liquid must be absolutely
clean, and the pipes in the heating system must be
free from contamination. This is necessary to prevent
the growth of bacteria in the system. Filling is carried
out through the expansion tank, either manually or