6.0 System Details
12
6.8
Domestic Hot Water Circuit
1. All DHW circuits, connections, fittings, etc.
should be fully in accordance with relevant
standards and water supply bye-laws.
2. Your attention is drawn to:
IRN 116 and the Water Supply (Water Fittings)
Regulations 1999 Schedule 2, Section 8,
paragraph 17. 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.
3. The boiler’s maximum working mains pressure
is 8 bar, therefore all pipework, connections,
fittings, etc. should be suitable for pressures in
excess of 8 bar. The pressure reducing valve
supplied in the ‘Unvented Kit’ must be fitted. The
manufacturer of any outlet fittings, such as a
shower valve, may require a lower maximum
pressure. The pressure reduction must take
account of all fittings connected to the DHW
system.
6.9
Showers
1. 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 valve manufacturer.
6.10
Hard Water Areas
1. 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 boiler.
