Swift Motorhome Owners Service Manual page 132

Air circulation
In order to achieve the best possible result
from the principle of convected heat, it is
important to allow air to circulate freely under
bunks, and behind backrests and wall-
mounted cabinets.
If the vehicle has a fitted carpet, ensure that
the carpet does not obstruct the air supply to
the radiators.
It is just as important that cushions or
blankets do not interrupt the flow of air behind
backrests and wall cabinets.
Maintaining the heating system
Winter camping
While camping during the winter, ensure that
the flue is kept clear of snow and ice, since the
inlet air to the LPG boiler enters through the
flue. Do not start the LPG boiler until the flue
is completely free of snow. A flue extension
(part no. 3000 320) for fitting on the roof is
recommended for winter camping.
Air stream
Convectors
The heating system
Regularly check the heating system's fluid level
in the expansion tank. The level should be
about 1cm above the minimum indicator in a
cold tank. The heating system should be filled
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 50% water and 50% glycol.
Any vessels used for 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 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 up.
Never allow the heating system to stand empty
of glycol.
Filling the system with glycol fluid
Note: Any vessels used to carry the fluid
must be spotlessly clean and the pipes in
the system must be free of contamination.
This will prevent the growth of bacteria in the
system.
The system is filled through the expansion
tank, either manually or using the Alde filling
pump which both tops up and bleeds the
system. For manual filling, unfasten the
circulation pump nut (R) and lift the pump (S)
if fitted, out of the tank. Slowly pour the glycol
mixture into the tank. Bleed the system.
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.
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