FITTED EQUIPMENT
120
Bleeding Air
The HTF will contain some air. This is
unavoidable. Air bubbles can also be
introduced when the system is filled.
In a newly-filled central heating system, you
will need to bleed air from the bleed points
to ensure best performance. There is an
automatic air bleed valve on the boiler. There is
also an air vent on the expansion tank.
The installer should fit bleed points elsewhere
in the system, especially where the pipes step
up and down, and on radiators and towel rails.
Air will accumulate at these high points and
become trapped.
Note: Contact the dealer or installer for
details on where the bleed points are in your
system, and how to access them.
To bleed the system, set the desired
temperature to 30°C and select gas heating on
the control panel.
If fitted set the 12V inline circulation pump on
the side of the boiler to speed 5 (Fig 1 [D]),by
turning the blue speed dial clockwise, on the
face of the pump motor. NB: Speed is not
adjustable if using the 12V circulation pump
fitted in the expansion tank.
After 10 mins, set the pump back to its
normal running speed (2 for a caravan, 3 for a
motorhome).
Now power off the Alde 3020 Compact
HE boiler completely, making sure that the
circulation pump is not active.
Follow the flow pipe from the boiler, and bleed
the system at each bleed point.
If Alde bleed points have been fitted, these are
metal bleed screws mounted on black EPDM
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.
Fig 4
Move on to the next bleed point and repeat,
until all bleed points have been tended to.
Air Lock
If enough trapped air accumulates at one
point, an air lock can result and prevent the
circulation of hydronic heating.
A ramp or steep slope can be used to raise
one end of the vehicle, causing the trapped
air to shift around the system. Repeat the full
bleed procedure. A caravan can be slowly and
carefully tilted to reproduce this effect.
To clear a stubborn air lock in under 15
minutes, an Alde-certified service agent can
use the Alde 1900-811 or 839 twin-motor
service pump.
230v ELECTRIC
The Alde 3020 Compact HE boiler has two
230 V electric heating elements, outputting
1050 W and 2100 W, or 3150 W combined,
and drawing 5 A, 9 A, and 14 A respectively
(rounded).
230v breakers, fuses, fused spurs and isolator
switches should be rated for 16 A.
Before using electric heating, check the
current limit on the electric supply you are
hooking up to.
• 6 A limit, only use 1 kW electric heating.
• 10 A limit, use 1–2 kW electric heating.
• 16 A limit, use 1–3 kW electric heating.
Note: If the electric supply has unstable
voltage, the amperage will also fluctuate.
ALDE HEATING OPERATING INSTRUCTIONS
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