Filling The System With Glycol Fluid; Bleeding The Heating System - Alde Compact 3010 Instructions D'utilisation

The glycol content should be checked at the expansion
tank using a pH tester before topping up with new liquid.
This will ensure that the concentration of glycol in the mix-
ture 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. Be sure to check the bleeder located
at the end of the convector. Be sure to thoroughly clean
up any puddles of leaked glycol. Rinse the area with
water and wipe up the excess. The recommended glycol
product is considered nontoxic, but we still recommend
that you use care to prevent accidental ingestion by chil-
dren or pets.
FILLING THE HEATING SYSTEM WITH
GLYCOL FLUID
NOTICE
Any vessels used to carry the fluid must be spot-
lessly clean and the pipes in the system must be
free of contamination. This will prevent the growth
of bacteria in the system.
Fill the system through the expansion tank, either manu-
ally or using the Alde filling pump, which both tops up and
bleeds the system. To purchase a filling pump, contact
your Alde dealer. For manual filling, remove nut
(See Figure 7) from the tank. Slowly pour the glycol mix-
ture into the tank. Bleed the heating system (see direc-
tions below). Top up with more liquid if the level has fallen
after bleeding. Bleed a newly filled heating system regu-
larly during the first days the heating system is in opera-
tion.
BLEEDING THE SYSTEM
Depending on how the pipes have been fitted, air pockets
may form when the heating system is filled with glycol
fluid. A sign that there is air trapped in the heating sys-
tem is that the heat released into the pipes only extends
2-3 feet or so from the boiler, even though the circulation
pump is operating.
In newly filled heating systems, small air bubbles can
form in the expansion tank, creating a gurgling sound. If
the circulation pump is stopped for a few seconds, the
bubbles will usually disappear; however, if the problem
persists, bleed the heating system to remedy the prob-
lem.
Automatic Bleeding
All boilers sold in North America come with an automatic
air vent (see Figure 8), which will bleed the heating sys-
tem automatically. If you do not have an automatic air
vent, a bleeder screw is fitted to the outgoing pipe for
manual bleeding.
8
Manual Bleeding
To bleed the heating system manually, follow the steps
below:
1. Switch off the circulation pump.
2. Open the bleeder screw and leave it open until it
starts to discharge water.
3. Close the bleeder screw.
4. Open the remaining bleeder screws in the system
(please refer to the instruction manual of the RV for
their locations).
5. Leave the bleeder screws open until they start dis-
charging fluid, and then close them.
6. Start the LP gas boiler.
7. Start the circulation pump and let it run for a while.
Check that the pipes and convectors around the
vehicle are heating up.
NOTICE
Never open the bleeders while the pump is running,
because this will induce air into the system.
Persistent Air Lock
If air lock persists, try the following:
Single-axle trailers:
1. Stop the circulation pump.
2. Lower the front of the trailer as far as possible. Leave
it in this position for a few minutes to allow the air to
travel upwards in the heating system.
3. Open the bleeder screw at the highest point. Leave it
open until it discharges glycol fluid.
4. Raise the front of the trailer as far as possible and
repeat the procedure in this position.
5. Position the trailer horizontally and start the circula-
tion pump.
6. Check that the pipes and convectors around the vehi-
cle are heating up.
Motorhome or twin-axle trailers:
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 heating system as
described above. Alternatively the heating system can be
bled using the approved filling pump. To obtain a pump,
check with your Alde dealer.
Figure 8. Automatic Air Vent