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10.

Electrical connection

The installation of the heating element and commissioning must be carried out by a skilled person
who assumes the responsibility for the proper execution and configuration in his/her capacity as a
professional. As a basic rule, the electrical connection should be made as indicated on the enclosed,
type-specific wiring diagram! Make sure the supply voltage is correct! All accessible metal parts of the
tank must be covered by the safety/protection measure.
An allpole disconnector with 3 mm contact gap width must be integrated in the power supply line. An
automatic circuitbreaker may also be used as the disconnecting device. The connecting cable must be
introduced into the connection space of the fitted heater through the attachment bolting. A cable
grip (strain relief device) must be used for protection against pulling and twisting.
The connection with the power grid must be implemented in conformity with the applicable national
regulations and standards, the relevant connecting requirements of the local power company and
waterworks, as well as the standards of the Mounting and Operating Instructions, and must be
performed exclusively by a licensed electrician. The stipulated protective measures must be executed
carefully, so that no other power-supplied devices are affected thereby in the
event of a malfunction or failure of the hot water tank’s power supply (e.g. freezer, rooms used for
medical purposes, units for intensive care, etc.). In rooms with bathtubs or showers, the device must
be installed in accordance with the national laws and regulations (e.g. of ÖVE-SEV, VDE or DIN VDE
0100-701). The technical connecting requirements (TAB) of the relevant energy supply company must
absolutely be observed. A residual current circuit breaker with a tripping current IΔN≤30mA must be
connected in series before the electric circuit. The device must only be connected with permanently
laid lines. These types of water heaters are to be supplied exclusively via a hard-wired connection
cable and are therefore not suitable for connection via a shock-proof plug (SKI). Accidental activation
of the upstream RCD is to be avoided in this way. An all-pole disconnecting unit with at least 3mm
contact clearance must be connected in series before the device. This
requirement is fulfilled e.g. by an automatic cutout. It is imperative that the hot water tank is filled
with water prior to electrical start-up. In accordance with the safety regulations, the hot water tank
must be switched powerless, secured against being switched on again and checked for powerlessness
prior to any intervention. Interventions to the electrics of the device must only be performed by a
licensed electrician. As a rule, the electrical connection must be performed in accordance with the
circuit diagram affixed inside the connecting area of the tank!
The output data for the choice of the contactors is given in the table (Section: Technical Data) in the
»Switching group« column. The STB (security temperature limiter) contactor must be designed for the
total output of the switching groups. When the installation has been completed, the function of the
contactors must be checked to ensure they work properly.