Filling The System With Glycol Fluid P; Bleeding The System P; Bleeding; Troubleshooting - Bailey Unicorn Owner's Manual

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 fluid
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 filling, 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- filled system
regularly during the first days the heating system is in
operation.
Bleeding the System
Depending on how the pipes have been fitted, air pockets
may form when the system is filled only with glycol fluid.
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 filled 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 fitted 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
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 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
fluid. 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
• Check that the fuse spur is switched on.
• 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.
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