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ALDE BOILER
FITTED EQUIPMENT Bleeding Air
The HTF will contain some air. This is Fig 4
unavoidable. Air bubbles can also be
introduced when the system is filled. Move on to the next bleed point and repeat,
until all bleed points have been tended to.
In a newly-filled central heating system, you
will need to bleed air from the bleed points Air Lock
to ensure best performance. There is an
automatic air bleed valve on the boiler. There If enough trapped air accumulates at one
is also an air vent on the expansion tank. point, an air lock can result and prevent the
circulation of hydronic heating.
Bleed points are installed at strategic points
within the system to allow any trapped air to A ramp or steep slope can be used to raise
bleed off. one end of the vehicle, causing the trapped
air to shift around the system. Repeat the full
Note: Contact the dealer or installer for bleed procedure. A caravan can be slowly and
details on where the bleed points are in your carefully tilted to reproduce this effect.
system, and how to access them.
To clear a stubborn air lock in under 15
To bleed the system, set the desired minutes, an Alde-certified service agent can
temperature to 30°C and select gas heating use the Alde 1900-811 or 839 twin-motor
on the control panel. service pump.
If fitted set the 12v inline circulation pump on 230v ELECTRIC
the side of the boiler to speed 5 (Fig 1 [D]),by
turning the blue speed dial clockwise, on the The Alde 3020 Compact HE boiler has two
face of the pump motor. NB: Speed is not 230 V electric heating elements, outputting
adjustable if using the 12 V circulation pump 1050 W and 2100 W, or 3150 W combined,
fitted in the expansion tank. and drawing 5 A, 9 A, and 14 A respectively
(rounded).
After 10 mins, set the pump back to its
normal running speed (2 for a caravan, 3 for a 230v breakers, fuses, fused spurs and isolator
motorhome). switches should be rated for 16 A.
Now power off the Alde 3020 Compact Before using electric heating, check the
HE boiler completely, making sure that the current limit on the electric supply you are
circulation pump is not active. hooking up to.
Follow the flow pipe from the boiler, and bleed • 6 A limit, only use 1 kW electric heating.
the system at each bleed point.
• 10 A limit, use 1–2 kW electric heating.
If Alde bleed points have been fitted, these are
metal bleed screws mounted on black EPDM • 16 A limit, use 1–3 kW electric heating.
rubber connectors (Fig 4). Have a cloth in
hand. To open, turn the screw anticlockwise
between thumb and forefinger. Air will hiss out.
When fluid trickles out, close the bleed screw
and mop up fluid with the cloth.
Note: If the electric supply has unstable
voltage, the amperage will also fluctuate.
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