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13
5.9 Water Pressure
The minimum working pressure to obtain the maximum
domestic flow is:-
24cxi 1.0bar
30cxi 1.0bar
38cxi 2.5bar
The maximum working pr
essure of the domestic hot water
circuit is 10 bar. If the cold water supply pressur
e exceeds
this, then a pressure-reducing valve must be fitted in the
supply to the boiler.
5.10 ‘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.
5.11 Domestic Water Flow Rate
The domestic hot water flow has a restrictor, factory fitted,
which reduces the flow to a maximum of, 8.0 l/min for 24cxi,
12.0 l/min for 30cxi and 15.5 l/min for 38cxi.
5 Water System - Domestic Hot Water
12253
Diagram 5.2
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