14
Installation
fo
r the technician
Electrical connections
The link of the room thermostat works with a safety extra low voltage (SELV); connect it to
the voltage free terminals of the room thermostat/cronothermostat. On NO account must
any electrical voltage be applied to these terminals.
The boiler must be connected to an electrical line of 230V-50Hz, respecting the polarities L-N (Live-
Neutral) and the earth connection.
PLACE UPSTREAM THE BOILER A DOUBLE POLE SWITCH.
The double pole switch must have a minimum contact separation of 3 mm on each pole. For the
general electrical supply of the appliance, the use of adaptors, multiple taps and extensions is not
allowed.
If the supply cable must be replaced, use one of the following wire types: H05VVF or H05-VVH2-F.
It is mandatory the earth connection in accordance with the rules actually in force. To replace
the cable, release the cable fastener placed on the frame of the hydraulic connections, open the
back cover of the control panel and disconnect it from the terminals. Install the new cable working
in the reverse way. It’s IMPORTANT to lock tha cable in the cable fastener placed on the frame of
the hydraulic connections.
Electrical safety of the appliance is only achieved when it is well connected to an
efficient earthing system, executed as indicated by the safety rules actually in force.
A qualified technician must check that the electrical system is in line with the maximum power
allowed by the boiler, indicated on the data plate, with particular attention to the cables section.
Remark: HERMANN Ltd. declines any responsibility for damages to persons, animals or
things caused by the non-connection of the boiler earthing and by failure to comply with
the rules.