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from the room thermostat a 1 mm
should be made to the vehicleʼs 12-volt battery or to a
battery intended for the living quarters. The connection
should be made in accordance with fig 10.
240 volts (immersion heater only)
The immersion heater must always be connected to
a 240-volt earthed socket. Permanent installation of a
240-volt wallsocket must be made. Keep cables clear of
immersion heater body.
WARNING: 240 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 vehicle. 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. The boiler must be raised on a plinth
if there are upper alcoves, se fig 12.
How many metreʼs of radiator are required in the
vehicle?
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 living area 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. If the vehicle has a sleeping alcove
above the driverʼs cab, it is very important to locate an
air screw at the highest point (see fig 12 E). All curves
should be as gentle as possible, otherwise circulation is
obstructed.
Make sure that radiators and pipes are properly attached
with brackets. As a connection between radiators and
10
GB
cable. The connection
2
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 hea-
ting 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 cop-
per 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.
Fig 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
with the aid of Aldeʼs filling pump. This pump both fills