Electrical Installation Requirements - Thermaflow TH12 Instructions For Use Installation And Servicing

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The position of discharge pipes (Tundish) drain valves and motorised valves etc, must be
positioned away from electrical components.
The water may drip from the discharge pipe of the pressure-relief device and must be left open
to the atmosphere.
The pressure relief device must be operated regularly to remove lime deposits and to verify that
it is not blocked.
The discharge pipe connected to the pressure-relief device must be installed in a continuously
downward direction and in a frost free environment.
The connection for the discharge is made at the bottom side of the safety relief valve. A tundish
should be fitted by the installer (if required) in accordance with G3 of the current building
regulations.
This must be extended, using not less than 15mm O.D. metal pipe, to discharge, in a visible position,
outside the building, facing downwards, preferably over a drain. The pipe must have a continuous fall and
be routed to a position so that discharge water, possibly boiling or steam, cannot create any danger to
persons, damage to property or external electrical components and wiring.

2.6 Electrical Installation Requirements

• Power supply and wiring
The power supply to the premises must meet the minimum requirements of the unit being installed, with special
attention given to the supply current, cable size and MCB recommendation. The supply voltage to the appliance
must never drop below 207 Volts.
Important
The electrical supply requirements:-
The 9 KW and 12 KW boilers meet the requirements of EN 610000-3.3
The 9 KW and 12 KW boilers must be installed in premises having a service supply of ≥ 100A
per phase.
The 12 KW boiler must be installed in premises having a system impedance of not more than 0.1939 + J 0.1939Ω
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