Air Circulation; Bleeding The System - Alde COMPACT 3000 92 serie Betriebsanweisung

AIR CIRCULATION

In order to achieve the best possible
result from the principle of waterborne
heat, it is important to allow air to cir-
culate 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 back-
rests and wall cabinets.
Air current
Radiators
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 comple-
tely free of snow. A flue extension (part
no. 3000 320) for fitting on the roof is
recommended for winter camping.
The LPG system
The LPG system should be checked
regularly by a professional, who will
ensure that there are no leaks from con-
nections or hoses. LPG hoses should
be changed every second year, since
their propensity to dry out and crack will
eventually result in leaks.
To increase safety, we recommend fit-
ting an Alde leak gauge, type 4071, as
close as possible to the pressure reduc-
tion valve.
Leak gauge, type 4071
10
GB
The heating system
Regularly check the heating system's
fluid level in the expansion tank. The
level should be about 1 cm above the
minimum indicator in a cold tank.
The heating system should be filled with
a mixture of water and glycol. For pre-
ference, 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°C, the glycol
content must be increased, but not to
more than 50%.
Any vessels used for the liquid must be
spotlessly clean, and the pipes in the
heating system must be free of contami-
nation. 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
NB! Any vessels used to carry the fluid
must be spotlessly clean and the pipes
in the system must be free of contami-
nation. This will prevent the growth of
bacteria in the system.
MAX
MIN
The system is filled through the expan-
sion tank, either manually or using the
Alde filling pump which both tops up
and bleeds the system. For manual fil-
ling, unfasten the circulation pump nut
(R) and lift the pump (S) 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 hea-
ting system is in operation.

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 bubb-
les can form in the expansion tank, cre-
ating a murmuring sound. If the circula-
tion pump is stopped for a few seconds,
the bubbles will disappear.
Bleeding:
If a bleeder screw is fitted to the outgo-
ing pipe on the rear of the boiler, 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. 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:
Single-axle caravan: Stop the circu-
lation pump. Using the jockey wheel,
lower the front of the caravan as far
as possible so that the rear is tilted
S
upwards. Leave it in this position for a
few minutes to allow the air to travel
upwards in the system. Open the blee-
R
der screw at the highest point. Leave
it open until it discharges glycol fluid.
Using the jockey wheel, 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.
Motor caravan or twin-axle caravan:
The easiest way to bleed the heating
system is to place the vehicle on a slo-
ping surface or to raise one end of the
vehicle using a jack. Bleed the system
as described above