Operating instructions

39
in the expansion tank. The level should be about
1cm above the minimum indicator in a cold tank.
The heating system should be lled with a mixture
of water and glycol. For preference, use high
quality ready 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°, the
glycol content must be increased, but not more
than 50%. Any vessels used for the liquid must
be spotlessly clean, and the pipes in the heating
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 concentration
of glycol in the mixture is not too high. If the uid
level in the expansion tank falls for reasons other
than evaporation, please 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 out. Never allow the
heating system to stand empty of glycol.
Filling the System with Glycol Fluid.
For manual lling, unfasten the expansion tank nut
(R) and slowly pour the glycol mixture into the tank.
Bleed the system and top up with more liquid if the
level has fallen after bleeding. Bleed a newly- lled
system regularly during the rst days the heating
system is in operation.
Bleeding the System
Depending on how the pipes have been tted, air
pockets may form when the system is lled only
with glycol uid. A sign that here 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
lled systems, small air bubbles can form in the
expansion tank, creating a murmuring sound. If
the circulation pump is stopped after a few seconds,
the bubbles will disappear.
Bleeding:
If a bleeder screw is tted to the outgoing pipe,
open this bleeder screw and leave it open until it
starts to discharge water. Start the LPG boiler. The
circulation pump should be switched off. To help the
system to bleed quicker turn the pump up to 5.
Open the remaining bleeder screws in the system.
Leave the bleeder screws open until they start
discharging uid, 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 fail to heat up 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 screws at the highest point. Leave
it open until it discharges glycol uid. Raise the
front of the caravan as high as possible and repeat
the procedure in this position. Then position the
caravan horizontally and start up 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.
Troubleshooting:
The Boiler Does Not Start
No LPG? Incorrect type for the conditions.
Is the main tap fully open?
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.
Check that the boiler is connected to the electricity
supply (> 11V).
Check that the fuse (T) for the boiler is intact.
Check whether the electric connections to the
boiler are securely in position.
If none of the above helps, contact a service
workshop.