Fitting the room thermostat2:4
The room thermostat should be placed at least 1 metre
above the oor, but not too close to the ceiling. It should
not be placed on an outer wall, beside the boiler, cooker,
fridge or ue. The room thermostat starts and stops the
circulation pump according to the heat requirement.
Electrical installation2:5
12 volts
The electrical connection is made at the top of the boiler,
where a six-pole terminal block is tted. Use the accom-
panying terminal plug and the four spade connectors.
From the battery, a 1.5 mm
2
cable should be used and
from the room thermostat a 1 mm
2
cable. The connec-
tion should be made to a 12-volt car battery or to a spe-
cial battery eliminator. The connection should be made
in accordance with g 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
Terminal blockA.
Cut-out 1 amp fuseB.
Room thermostatC.
Battery 12 voltsD.
The boiler from aboveE.
FITTING THE HEATING SYSTEM3.
In order to obtain the best effect from the heating sys-
tem, the radiators should be tted along the outer walls
and under the windows. In order to obtain good air
circulation (g 11) and correct heat emission, fresh air
should be able to pass between bed bases, oor and
back cushions and outer walls (see g 12). It is there-
fore 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 g 13, the radiators will not be
able to emit sufcient heat, which will lead to a sharp fall
in temp era ture at windows and outer walls, leading to
condensa tion.
Installation should be carried out using Ø 22 mm pipe
and any type of radiator. Radiators constructed of cop-
per piping are most efcient. 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 boiler’s
expansion vessel. If there are upper alcoves in vehicles,
The boiler must be raised on a plinth se g 12.
How many metre’s of radiator are required in the
caravan?
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 dis-
tribution. 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 g 12 E).
In vehicles, if there is a sleeping alcove above the
driver’s cab, it is very important to locate air screws at
the highest point. All curves should be as gentle as pos-
sible, otherwise circulation is obstructed.
Make sure that radiators and pipes are properly at-
tached with brackets. As a connection between radiators
and pipes, short rubber connections made of special
rubber 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 tted to the lowest
point of the pipe (see g 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
Air ow A.
RadiatorsB.
Fig 12
Circulation owA.
Circulation returnB.
Ventilation ductC.
RadiatorD.
Air nippleE.
Drain cockF.
Room thermostatG.
Connection to the heating system3:1
The LPG boiler’s connections to the heating system are
located on the rear of the boiler. Use the same rubber
connections, clips and sealant as for the rest of the
system.
LPG boiler with water heater type 2959 and immersion
heater should be tted in accordance with g 14.
Figs 14
Flow radiator water A.
Return radiator waterB.
Filling the heating system3:2
The heating system must be lled 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
temperatures 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
