FITTED EQUIPMENT
108
Draining
A drain is fitted in the central heating system,
to allow draining of the HTF. Because the pipes
step up and down, some HTF will be left in the
system after draining. Contact an Alde certified
agent to drain and refill your system.
Central Heating
The boiler is set to an upper limit temperature
of 85°C, i.e., the temperature of the heat
transfer fluid (HTF) as it circulates around the
pipes, radiators, convectors, et al.
To ensure the best performance from hydronic
heating, air must be able to circulate freely
around the back of the furniture (Fig 3). Air
vents, cut into the top and bottom of the
furniture must be unobstructed by carpets,
cushions, or stowage, etc.
The full length of a convector should be
ventilated for best performance.
Note: Use gas and electric heating
simultaneously for the best performance.
The boiler will only use as much energy as is
needed, and is 93% efficient on a SEBDUK
based test.
Figure 3
Bleeding Air
The HTF will contain some air. This is
unavoidable. Air bubbles can also be
introduced when the system in 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.
Bleed points are installed at strategic points
within the system to allow any trapped air to
be bled off
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.
Set the 12 V 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 12 V 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, closethe bleed screw
and mop up fluid with the cloth.
ALDE HEATING OPERATING INSTRUCTIONS
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