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16
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 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 61000-3.3
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
0.1939
Ω
2.6.1 SUPPLY
The boiler requires two separate ~230-240V power supplies. A (24HR) supply for controls and an
interruptible supply for the boiler
. (Off Peak power supply if it is
available).
The off peak or interruptible mains supply is wired according to the following
diagram 2.6.1
, from the
63 amp double pole isolator by way of flexible 16mm² cable into the main terminals in enclosure
marked
No. 3
on the boiler schematic
diagram 1.8.1
, see
diagram 2.6.1
below.
