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A good supply of air is essential to ensure
complete combustion. The flame should
burn with a weak blue colour, the centre
of the flame should be blue/green. LPG is
extremely environmentally compatible and
does not generate any soot during complete
combustion. It can be stored in cylinders
for an unlimited time period, without any
deterioration of quality.
Pressure
The LPG burner usually works at a lower
pressure than that in the cylinder. Low pressure
(0-50 mbar) and intermediate pressure (50
mbar- 2.0 bar) are created by allowing the
gas to pass through a reduction valve. High
pressure (over 2.0 bar), is unreduced pressure
mainly used in camping equipment. Low
pressure and intermediate pressure are always
reduced pressure.
fAULT fInDInG
The boiler does not start
1. No LPG? Incorrect type for conditions?
2. Is the main tap fully open?
3. If the boiler has not been operated for
some time, or if the gas cylinder has been
changed, it may take longer than normal
to light the boiler.
4. Check that the boiler is connected to the
electricity supply (> 11V).
5. Check that the fuse (T) for the boiler
is intact.
6. Check whether the electric connections on
the boiler are securely in position.
If none of the above helps, contact a
service workshop.
The heating cartridge is not working
1. Check that there is an electricity supply
(230V ~) to the heating cartridge.
2. Check that the relays fitted to the boiler
come on (a slight click can be heard from
the relays when the heating cartridge is
switched on at the control panel).
If none of the above helps, contact a
service workshop.
WARRAnTY
Alde’s warranty is valid for 3 years from the
date of purchase of the caravan.
It covers material defects or manufacturing
faults on the Alde heating system.
It does not cover frost damage, normal wear
and tear parts, Antifreeze, batteries or other
consumables. If you have a problem please
contact your dealer or Alde UK direct.
note: only genuine Alde parts should be
used as replacement parts.
BLEEDInG THE SYSTEM
– Max
– Min
S
R
Depending on how the pipes have been fitted,
air pockets may form when the system is filled
with glycol fluid.
A sign that there is air trapped in the system
is that the heat released into the pipes only
extends a metre or so from the boiler even
though the circulation pump is operating.
In newly-filled systems, small air bubbles
can form in the expansion tank, creating a
murmuring sound. If the circulation pump
is stopped for a few seconds, the bubbles
will disappear.
Bleeding
If a bleeder screw is fitted to the outgoing
pipe, open this bleeder screw and leave it open
until it starts to discharge water.
If the boiler is fitted with an automatic bleeder,
there is no need to bleed it manually. Start the
LPG boiler. The circulation pump should be
switched off.
Open the remaining bleeder screws in the
system (please refer to the instruction manual
of the vehicle for their locations). Leave
the bleeder screws open until they start
discharging fluid, and then close them. Start
the circulation pump and let it run for a while.
Check that the pipes and radiators around the
vehicle are heating up.
If they still fail to heat up, try the
following:
Motor caravan
The easiest way to bleed the heating system is
to place the vehicle on a sloping surface or to
raise one end of the vehicle using a jack. Bleed
the system as described above.
ABoUT LPG
The properties of LPG
LPG is a petroleum product, formally known
as ‘liquid petroleum gas’. It is mainly made up
of propane and butane gas. The advantage
of propane is that it remains gaseous at
temperatures as low as -40°C, while butane
loses effectiveness at +10°C. For this reason,
propane is used in colder countries.
The cylinders contain LPG both in liquid and
gaseous form. When the cylinders are filled,
the pressure turns the gas into liquid. When
the cylinder valve is opened, the LPG becomes
a gas again. The risk involved in using LPG is
that any leaking gas may ignite and explode.
Since LPG is heavier than air, any leaking gas
will collect at the lowest point.
LPG contains no toxic substances, but
breathing in concentrated gas may have a
certain anaesthetising effect, and can also
result in shortness of breath and symptoms
of suffocation.
These symptoms quickly disappear if the
sufferer breathes in ordinary air or oxygen.
Naturally, it is inadvisable to inhale either LPG
or exhaust fumes. To make it easier to detect
gas leaks, a substance with a distinctly rank
smell has been added.
Combustion
Complete combustion of LPG only generates
carbon dioxide (CO2) and water vapour, just
like the air we exhale.
