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Pressure
Gauge
Air Vent
4.0 |
| System Details | |
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| Sealed Systems (Figs. 6, 7 & 8) | |
4.7 |
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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. |
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2. Pressure Relief Valve. A |
Safety
Valve
Expansion
Vessel
Boiler
Pump
Flow
Return
Indirect
Cylinder
Radiator
Circuit
Filling
Point
pressure relief valve, preset to operate at 3 bar |
(45 lbf/in2) shall be used. It must comply with BS 6759:1 |
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 |
pressure indicator, covering the range |
lbf/in2) shall be fitted to the system. It should be |
connected to the system, preferably at the same point |
Fully Pumped Sealed System
Fig. 6
as the expansion vessel. Its location should be visible |
from the filling point. |
© Baxi Heating UK Ltd 2009 | 13 |