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Genesis
SYSTEM DETAILS – Page 12
44 - 45
Supplied By www.heating spares.co Tel. 0161 620 6677
Domestic Hot Water Circuit
All DHW circuits, connections, fittings etc should be
fully in accordance with relevant standards and water
supply bye-laws.
Your attention is drawn to: IRN 116 and Byelaw 90 and 91.
Sealed primary circuits and / or secondary hot water
systems shall incorporate a means for accommodating the
thermal expansion of water to prevent any discharge from
the circuit and / or system except in an emergency situation.
When the system includes any device which prevents water
expanding back towards the supply (check valve, loose
jumpered stopcock; water meter, water treatment device),
then an expansion vessel must be fitted e.g. (Zilmet 160ml,
R ½ 15bar).
To comply with Byelaw 91,a check valve must also be fitted
on the supply as shown, to ensure efficient operation and
also to prevent the reverse flow of hot water into the supply
pipe.
IF THE HOT WATER EXPANSION IS NOT PROVIDED
FOR, THEN HIGH PRESSURES CAN DEVELOP WHICH
MAY RESULT IN DAMAGE TO FITTINGS AND DEVICES
ON THE SYSTEM.
The appliance maximum working mains pressure is 10 bar
2
(150 lb/in
), therefore all pipework, connections, fittings etc
should be suitable for pressures in excess of 10 bar: A
pressure reducing valve must be fitted for pressures in any
outlet fittings, such as a shower excess of 10 bar: The
manufacturer of valve, may require a lower maximum
pressure. The pressure reduction must take account of all
fittings connected to the DHW system.
SHOWERS
If a shower control is supplied from the appliance it should
be of the thermostatic or pressure balanced type.
Thermostatic type shower valves provide the best comfort
and guard against water at too high a temperature. Existing
controls may not be suitable - refer to the shower
manufacturers.
HARD WATER AREAS
If the area of the installation is recognised as a HARD
WATER AREA then a suitable device should be fitted to
treat the mains water supply to the appliance.
Baxi Heating Ltd.
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