17 0020008154A
General - All domestic hot water circuits, connections, fittings
must be in accordance with the relevant standards and water
supply regulations.
For GB: Guidance G17 to G24 and recommendation R17 to
R24 of the Water Regulations Guide.
For IE: The current edition of I.S.813 "Domestic Gas Installations".
5.1 Water Pressure
The maximum working pressure of the domestic hot water
circuit is 10 bar. If the cold water supply pressure exceeds this,
then a pressure-reducing valve must be fitted in the supply to
the boiler.
4 Heating System
4.6 Water Treatment
In the case of an existing installation, it is ESSENTIAL that prior
to installing the new boiler the system is thoroughly flushed. For
optimum performance after installation of a new system, the
boiler and its associated central heating system should also be
flushed. Flushing should be carried out in accordance with
BS7593: 1992 using a cleanser such as Sentinel X300 or X400,
Fernox Superfloc or Salamander corrosion guard cleaner.
For long-term corrosion protection, after flushing, an inhibitor
suitable for stainless steel exchangers should be used, refer to
the current issue of BS 5449 and BS 7593 on the use of
inhibitors in central heating systems. Examples are Sentinel
X100 Fernox or Salamander corrosion guard inhibitor.
4.7 Draining Tap
A draining tap must be provided at the lowest points of the
system, which will allow the entire system to be drained.
A drain tap for the appliance is provided as an integral part of the
hydroblock, see diagram 12.12.
5 Domestic Hot Water System
5.2 'Hard' Water Areas
The temperatures within the heat exchanger are limited by the
boiler control system to minimise scale formation within the hot
water pipework. However, in areas where the water is 'hard' (i.e.
more than 200mg/litre), it is recommended that the hot water
setting is reduced and that a scale reducer is fitted.
Refer to the manufacturer's instructions or consult the local
water company for additional advice.
5.3 Domestic Water Flow Rate
The water flow rate is restricted to a maximum 8 l/min (24cxi)
12 l/min (30cxi) and15.5 l/min (38cxi) by a restrictor fitted during
boiler installation, see diagram 7.1.
Diagram 4.3
12253
To Next Page
Loading...
Need help?
General
