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Central Heating
It must be a sealed system. Detailed recommendations are given in BS6798, BS5449, BS6700 and CP342 Part. 2. Pipework
not forming part of the useful heating surface should be insulated to prevent any heat losses or possible freezing (i.e. in roof
spaces or ventilated underfloor spaces). Drain taps should be positioned at the lowest point of the system in accessible
locations to permit the whole system to be drained down. The drain taps should be in accordance with BS2879. Copper tubing
to BS2871, Part. 1 is recommended for water carrying pipework. Pipework in horizontal runs should have a gradient where
possible to facilitate the removal of air. It should be ensured that the boiler heat exchanger is not a natural point for collecting
air. A typical heating system with domestic hot water circuit is illustrated in fig. 5.
Important - A bypass must be fitted as far as possible from the boiler if thermostatic radiator valves are fitted throughout.
Make up Water
Fig. 6
Key
1. Filling point C.H.
2. Temporary connection
3. Cold water supply
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