Electrical Connections; Flow Switch - Bencke EWT 80-40/-41 Bedienungsanleitung

3.6

Electrical Connections

The electrical connections are to be executed by an electrical specialist. Local
regulations as well as VDE 0100 are to be taken into consideration.
The heat exchanger must be permanently connected to fixed pipework which is fit-
ted with a protective earth conduktor.
The electric heat exchanger must be protected by at least two safety circuit breakers.
The following combinations are offered by the factory
take care
– with a control thermostat.
– with a control thermostat and a safety temperature limiter (STB).
– with a control thermostat, a STB and a Flow switch.
– with a contactor up to 12 kW.
If no contactor has been installed by the factory, an external protection for switch-
ing the heating element is necessary (e. g. Behncke control for EWT 80-xx).
Important!
It should be ensured that the electric heat exchanger can only be switched on if
the water throughput is ensured.
The electrical connections are to be effected in accordance with the switch diagram.
For safety reasons, an FI safety switch is to be integrated into the voltage supply
(30 mA). All metal parts are to be integrated into equipotential bonding.
3.6.1

Flow switch

Caution: Risk to life through electrical voltage!
Switch off the electrical system before you connect leads of the supply cable.
brown/black = connections for Reed contact (without 80-81)
The reed contact is electrically insulated (protection class II) and integrated into a
plastic sleeve.
ATTENTION: The maximum electrical contact capacity indicated onto the type
shield must not be exceeded, otherwise the reed contact, which is integrated in the
switching unit, will be damaged. The switching capacity is reduced with inductive
loads. Information about the protective system can be ordered at the manufacturer.
Set-up/Installation
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