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5.8 Vented (Open) Water System
The boiler must be supplied from an unrestricted water
supply taken from a feed and expansion cistern situated at a
maximum height of 27 metres (90ft) above the boiler.
The cold feed must be 15mm minimum size.
The vent must rise continuously and be unrestricted.
It is important that the relative positions of the pump, cold feed
and open vent are as shown in diagram 5.2.
5.9 Combined Feed and Vent
For combined feed and vent, a 22mm pipe must be tted in
accordance with BS 5449.
5.10 Domestic Hot Water Cylinder
SINGLE FEED INDIRECT CYLINDERS ARE NOT SUITABLE
The domestic hot water cylinder must be of the double feed
fully indirect coil type.
5.11 Draining Points
Draining taps must be provided at the lowest points of the
system, which will allow the entire system to be drained.
A draining point for the appliance is provided at the position
shown in diagram 5.3.
Diagram 5.3
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5 Water Systems - Open Vented
Diagram 5.2
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