Bleeding The Heating System - Alde Compact 3020 Instructions D'utilisation

1.13 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 system is that the heat released into the pipes only extends 2-3 ft or so
from the boiler, even though the circulation pump is operating.
In newly filled heating system, small air bubbles can form in the expansion tank, creating a gurgling sound. If the circu-
lation pump is stopped for a few seconds, the bubbles will usually disappear; however, if the problem persists, bleed
the heating system to remedy the problem.
• AUTOMATIC BLEEDING
All heating system sold in North America come with an automatic air vent (see figure 7), which will bleed the heating
system automatically. If you do not have an Automatic Air-bleeder, a bleeder screw is fitted to the outgoing pipe for
manual bleeding.
• 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 glycol.
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 loca-
tions).
5. Leave the bleeder screws open until they start discharging fluid and then close them.
6. Start the LP Gas operation on the heating system.
7. Start the circulation pump and let it run for a while.
8. Check that the pipes and convector's around the vehicle are heating up.
NOTICE
Never open the bleeder screws 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
upward 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 circulation pump.
6. Check that the pipes and convector's around the vehicle are heating up.
Motor-home 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, contact your Alde dealer.
Figure 7. Automatic Airbleeder
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