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Operation and Maintenance Manual - EN
12. Connection of the boiler and burner to the electric mains
Only connect the burner to the 230 V, 50 Hz electric mains via the boiler with a mains cable
without a plug so that the conductors (L, N) should not be interchanged. The mains supply must be
replaced with the same type by a repair organization. The boiler must be positioned in such a way
that the connector on the burner can be within the operators reach (in accordance with EN 60335-1).
CAUTION - Boilers with a burner may only be connected by a qualified person in accordance
with all the relevant valid regulations of the particular country while great attention must be
paid to safe earthing of the boiler.
After the installation of the burner on the boiler the technician must connect the burner and
subsequently the entire boiler to the electric mains in accordance with the attached wiring
diagram (pages 19 - 24).
Connection:
Between the burner and boiler a six-wire cable is newly used that is connected with one end to
the burner with a 6-pin connector (part of the burner) and the other end with a 6-pin connector to the
boiler.
The meaning of the conductors is as follows:
Black – phase L1 (230V, 50Hz) – With the main switch of the boiler on the black conductor is
permanently live (independently of the control thermostat of the boiler). It is the supply voltage of
the burner. This phase must be fuse protected via the safety thermostat of the boiler (95 - 110 °C).
Brown – phase L2 (230V, 50Hz) – The brown conductor is controlled by the control or another
thermostat on the boiler panel. It brings the phase, impulse for the burner start. It is perceived as
the starting (ignition) and shutdown signal. This phase must also be fuse protected via the safety
thermostat of the boiler. (95 – 110 °C).
Grey - reserve R (L3) (230V/50Hz) - The grey conductor is connected to the free place on the
boiler terminal board in the case of the boiler version with the 4-pin connector or directly to the
5-pin connector on the boiler. It serves as a reserve conductor for various functions of the boiler,
characterized with the S6 parameter. If you do not use the reserve function, connect the supply
cable directly to the connector, not connecting or cutting off the grey cable
Red - reserve R2 (230V/50Hz) - the red conductor is connected directly to the 6-pin connector on
the boiler. It serves as the second free reserve for various functions of the boiler, characterized with
the S14 parameter. If you do not use the reserve function, do not connect or cut off the red cable.
Blue - N – Neutral – The blue conductor is connected to the neutral conductor.
Yellow and green - PE – Protective Earthing – The yellow and green conductor is connected to
the earth.
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