FITTED EQUIPMENT
116
Bleeding the system
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 there are still issues, try the following:
Single-axle caravan:
Stop the circulation pump. Lower the front
of the caravan as far as possible. Leave it in
this position for a few minutes to allow the
air to travel upwards in the system. Open the
bleeder screw at the highest point. Leave it
open until it discharges glycol fluid. Raise the
front of the caravan as far as possible and
repeat the procedure in this position.
Then position the caravan horizontally and
start the circulation pump. Check that the
pipes and radiators around the vehicle are
heating up.
Twin-axle 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.
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.
ALDE HEATING OPERATING INSTRUCTIONS