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Genesis
SYSTEM DETAILS – Page 11
Supplied By www.heating spares.co Tel. 0161 620 6677
A filling point connection on the central heating return
pipework must be provided to facilitate initial filling and
pressurising and also any subsequent water loss
replacement/refilling.
The filling method adopted must be in accordance with
all relevant water supply byelaws using approved
equipment.
Your attention is drawn to: IRN 302 and Byelaw 14.
Unvented primary circuits may be filled or replenished by
means of a temporary connection between the circuit and a
supply pipe provided a 'Listed' double check valve or some
other no less effective backflow prevention device is
permanently connected at the inlet to the circuit and the
temporary connection is removed after use.
PRESSURE VESSEL
The appliance expansion vessel is pre-charged to 0.7 bar
2
(10 lb/in
). Therefore, the minimum cold fill pressure is 0.7
bar. The vessel is suitable for correct operation for system
capacities up to 125 litres (27.5gal). For greater system
capacities an additional expansion vessel must be fitted -
refer to BS 7074 Pt 1.
PRESSURE RELIEF VALVE
The pressure relief valve is set at 3 bar, therefore all
pipework, fittings etc should be suitable for pressures in
excess of 3 bar.
The pressure relief discharge pipe should be not less than
15mm, run continuously downward, and discharge outside
the building, preferably over a drain, and in such a manner
that no hazard occurs to occupants or cause damage to
wiring or electrical components.
The end of the pipe should terminate facing down and
towards the wall.
THE DISCHARGE MUST NOT BE ABOVE A WINDOW,
ENTRANCE OR OTHER PUBLIC ACCESS.
CONSIDERATION MUST BE GIVEN TO THE POSSIBIUTY
THAT BOILING WATER /STEAM COULD DISCHARGE
FROM THE PIPE.
Baxi Heating Ltd.
11
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