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Pressure
Gauge
Safety
Valve
Expansion
Vessel
Flow
Boiler
Return
Fully Pumped Sealed System
Fig. 6
© Baxi Heating UK Ltd 2009
Air Vent
Pump
Radiator
Circuit
4.0 System Details
4.7
1. Installation. The installation must comply with the
requirements of BS 6798 and BS EN 12828. The British
Gas publication "British Gas Specification for Domestic
Wet Central Heating Systems" should also be
consulted.
2. Pressure Relief Valve. A non-adjustable spring loaded
pressure relief valve, preset to operate at 3 bar
Indirect
(45 lbf/in
Cylinder
and include a manual testing device. It shall be
positioned in the flow pipe either horizontally or
vertically upwards and close to the boiler. No shut off
valves are to be placed between the boiler and the
safety valve. The valve should be installed with a
discharge pipe which permits the safe discharge of
steam and hot water such that no hazard to persons or
damage to electrical components is caused.
3. Pressure Gauge. A pressure gauge incorporating a fill
Filling
pressure indicator, covering the range 0-4 bar (60
Point
lbf/in
2
) shall be fitted to the system. It should be
connected to the system, preferably at the same point
as the expansion vessel. Its location should be visible
from the filling point.
Sealed Systems (Figs. 6, 7 & 8)
2
) shall be used. It must comply with BS 6759:1
13
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