15
15
GB
MH 3..7, MDH 3..7
Putting into service
Do not switch on the electric power at this time!
1. Open the hot-water tap and allow water to flow
until it emerges free of air bubbles.
2. Now close the circuit breaker. Hot water is delivered.
• Explain the functions of the heater to the user and ensure
that he knows how to use it.
• Hand over these operating instructions to the user.
Adjusting the water flow
The temperature and the flow depend on the conditions at the installation site. In case of quite low or high
inlet temperatures, you may reduce or increase the flow at the flow adjustment to achieve the desired hot
water temperature (see fig. 7 how to adjust the screw).
Careful! Don’t turn the adjustment screw further than the indent mark in order to avoid water
leakage.
Electrical connection
Fill the appliance completely with water by repeatedly opening and closing the tap before
connecting to electrical power. The heating element may be damaged if this is not done!
• The installation must comply with current IEC regulations or national local regulations or any particular
regulations, specified by the local electricity supply company!
• The mains cable must be permanently connected via connecting box as shown in the circuit diagram.
(see fig. 8). The earth conductor must be connected.
• A circuit breaker in accordance with IEC with a contact opening gap of at least 3 mm for each pole must
be provided on the mains side of the connecting box.
• The wiring cross-section must be well adapted to the corresponding power rating. See technical data.
• To protect the appliance, a fuse element must be fitted with a tripping current commensurate with the
nominal current of the appliance.
