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EN.33.C.111.1804
Assembly instructions | LK Electric Boiler - 4,5
When the system is filled with water it should be
air-bled at the electric boiler and the manifolds.
Flow - circulation pump
The flow must be secured. The boiler requires a
flow which produces a maximum Δt of 10°C (The
temperature difference between the boiler’s flow
pipe and return).
Connection output (kW)
Recommended flow (litres/min)
1,5
2,2
2,25
3,2
3,0
4,3
4,5
6,5
The diagram shows the maximum permissible
pressure drop in the heating system for the ca-
pacity of the circulation pump to produce a Δt of
10°C at the maximum pump speed, with the dial
positioned at III.
2 4 6 8 10
0
0
20
25
30
(kPa) Pressure resistance
Flow
(l/min)
Bypass valve
The circulation pump may be damaged if operated
if it is applied to closed valves. The bypass valve
reduces this risk. With the pump at maximum
speed, position III, the adjustment valve should
be open by at least half a revolution.
1
2
1. Isolation valve supply and return
2. By-pass valve, accessible after the protective
plug has been unscrewed.
Installation - system outline
Below is a system outline. Units should always be
installed according to regulations and standards.
4
1
2
3
1. LK Electric Boiler - 4,5
2. Filling valve/Drain valve
3. Manifolds under floor heating
4. Under floor heating system
Expansion vessel
Expansion vessel: 2 litres, delivery pre-pressure
1,5 bar.
The vessel supplies a heating system volume of
70 litres at 60°C and a static pressure of 5 metres.
At lower static heights or temperatures the vessel
supplies a greater volume.
If glycol mix is used the capacity of the expansion
vessel is reduced in relation to the amount of gly-
col mixed.
Safety valve
The safety valve, 2,5 bar, is mounted to the boiler,
the blow-off pipe flows into a drip pan in the boiler
cabinet.
Filling - air bleeding
The heating system should be filled with water up
to a pressure higher than the pre-pressure of the
expansion vessel, 1,5 bar. 2 bar is recommended.
