|Heating - Powered||No|
|Heating - Backflow Prevention||No|
Unvented Heating Systems; Commercial (non drinking).
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The primary heating system expansion shall be accommodated in an air charged Expansion Vessel - model EVCP - as distributed by Arrow Valves Ltd – Tel 01442 823123 www.arrowvalves.co.uk. The vessel body shall be mild steel with red epoxy coating with a bottom entry male connection. The butyl membrane shall be suitable for 99 degrees Celsius at 6 bar (for 80 litres and larger). A separate expansion vessel ball valve with wire lock, drain tap and union – model BVEV – shall be supplied to enable draining of the vessel in order to periodically check the air charge. The vessel must be correctly sized. The pre-charge pressure shall be 0.2 bar less than the switch on pressure of a booster pump.