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1:1 MAINTAINING THE HEATING SYSTEM
Check the heating system’s uid level regularly in the expan-
sion vessel. The level should be approximately 1cm above the
Min mark when the system is cold. The heating system should
be lled with a mixture of water and glycol. For preference, use
high quality pre-mixed glycol (with inhibitor) intended for use in
aluminium heating systems.
If using concentrated glycol, the mixture should consist of 60%
water and 40% glycol. If the heating system will be exposed
to temperatures below –25°C, the glycol content must be
increased, but not to more than 50%.
Any vessels used in handling the liquid must be spotlessly
clean, and the pipes in the heating system must be free of
contamination. This will prevent the growth of bacteria in the
system. The glycol mixture should be changed every second
year, since its ability to protect against corrosion, for example,
will deteriorate. The glycol content should be checked before
topping up with new liquid. This will ensure that the concentra-
tion of glycol in the mixture is not too high.
If the uid level in the expansion tank falls for reasons other
than evaporation, check all joints, drain cocks and bleeder
screws to ensure that they are not leaking. If the glycol-water
mixture leaks out, rinse with water and wipe up.
Never allow the heating system to stand empty of glycol uid.
Adding liquid:
Ensure that the vehicle is standing level, and check that the
bleeder screws and drain cocks are closed. Release the plastic
nut on the circulation pump, located on the expansion vessel,
and lift out the pump. Pour the glycol mixture slowly into the
expansion vessel, using a watering can. When the system is
being lled, air pockets may form, depending on how the pipe-
system has been installed. A good indication that there is air
in the system is when the heat only travels a few metres along
the pipe from the boiler, despite the fact that the circulation
pump is operating.
To make relling and bleeding easier, we recommend using
the Alde lling pump which quickly both lls and bleeds the
system automatically.
Bleeding a caravan heating system (manually):
The LPG boiler must be switched on and the circulation pump
switched off. Start by opening the bleeder screws (please refer
to the vehicle instruction book for their location). Leave them
open until liquid escapes through the spout at the air screw.
Switch on the circulation pump and let it run for a while. Check
whether the pipes and radiators all around the caravan are
warm.
If air still remains in the system, try the following:
The LPG must be switched on and the circulation pump
switched off. Lower the front of the caravan as far as possible
using the jockey wheel. Leave it in this position for several
minutes, to allow any air to rise to the highest point in the
system. Open the bleeder screw at the highest point and keep
it open until all the air has escaped.
Then raise the front of the caravan as high as possible using
the jockey wheel, and repeat the process.
Return the caravan to a horizontal position and start the
circulation pump.
Check that the heat is circulating all around the caravan. When
bleeding a trailer or a motor caravan, it is easier to park on a
steep slope, or raise the vehicle using a jack.
2:0 ABOUT THE COMPACT 3010
The set-up of the boiler.
The boiler consists of three eccentrically-tted pipes. The
innermost pipe is a heat exchanger made from extruded alu-
minium. This is surrounded by a water jacket containing a 40%
glycol mixture which is the uid for the heating system.
The fresh-water heater is located outside the water jacket. The
two outer pipes, as well as their ends and connections, are
made from stainless steel.
The heat exchanger is divided into two semicircular parts by a
u-shaped bafe plate.
The burner is located in the upper semicircle, the combustion
chamber. The bafe plate leads the ue gases back into the
lower part of the section, which constitutes the convection part.
The burner housing is tted on the end of the heat exchan-
ger. On the burner housing is a fan, burner, solenoid valve
and intake/exhaust connections. The exhaust gases escape
through the inner tube, and fresh air enters through the outer
tube. The exhaust fumes exit the vehicle via a hose and ue
tted either to the roof or to the wall. Fresh air enters via the
same ue (balanced draft).
2 electrical heating cartridges are tted to the upper part of the
water jacket. The maximum output of the cartridges is either
2kW or 3kW depending on boiler model.
2:1 HOW THE BOILER WORKS
The boiler is a combined unit for producing heat and hot water.
Electricity, LPG or a combination of both are used as energy
source. The electrical elements, of which there are two, have
an output of 1kW and 2kW respectively. The output is control-
led via a relay on a printed circuit board, and depending on
the model of the card, the maximum output is 2kW or 3kW
respectively. When starting, not all the power is connected in
at the same time, but connecting-in goes in two or three steps
with a few seconds delay between them. The LPG heater has
a burner that works in two steps. The lower of the two steps is
3kW, and the higher is 5.5kW. The power step that the heater
works on is determined by the requirement for heat in the
vehicle. Functions are also connected to the printed circuit
board that are required for monitoring and controlling the
heater.
They can be divided into the following units:
• Monitoring and regulating the speed of the fan at the two
different power steps.
• Opening the different power steps of the gas valve at the
right point of time. The ignition sparks the burner via the two
spark electrodes mounted on the burner.
• Monitoring of the ame through ionised sensing via ame
sensor pin mounted on the burner.
• Control and monitoring of radiator temperature via sensor
mounted on the boiler body.
Control of warm water temperature via sensor mounted on
the heater.
• Regulation of room temperature in the vehicle via sensors
in the panel or sensors connected to the panel.
Filling pump
Art no 1900 811
