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Overflow valve
The (under floor) heating system should not ex-
ceed a flow pressure of 20 kPa.
If all of the heating system valves close, circula-
tion ceases in the boiler and there is a risk of over
heating, then the "maximum safe temperature"
protection is tripped. To avoid this, an overflow
valve is built in, ensuring flow though the boiler.
If the pressure resistance of the heating system ex-
ceeds the overpressure, flow problems can arise in
the heating system.
Filling
When filling the heating system, the safety valve
must be kept open until water flows from the
overflow pipe. Next, close the safety valve and
fill with water and pressurise to approx. 2 bar.
Air-bleeding
Bleed the system of air via the air-bleed valves
on the boiler and heating (system) manifolds. The
air-bleed valves have a protective cap, these need
loosening slightly to allow air passage.
To ensure air-bleed valves work properly, the sys-
tem pressure must not fall below 1.5 bar.
Bleeding the pump is done via its air-bleed screw.
Loosen the screw and hold a piece of cloth over
the opening as a little water may spurt out.
Electrical installation
Electrical installation work must be carried out
by a qualified electrician.
The boiler and the heating system must be filled
and bled of all air, before the boiler is powered up.
Assembly instructions | LK Electric Boiler 11-n
The boiler's electrical connection requires a cable
measuring 5 x 4 mm
2
mum 3 x 20 A.
Outside temperature sensor
The sensor is mounted in the north or north-west
facing wall, below the eaves and away from win-
dows or doors.
The sensor is attached to terminals 4 and 5 in
the terminal bloc. The wires must be at least of
0.75 mm
and they must not be placed near power
2
cable, as induction currents can affect the signal.
Loading relay / transformers
Group centre
Transformers
Main fuse
Cu, with fusing at maxi-
4
EN.33.C.94.1702
5 (15)
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