DIY Doctor

Domestic heating

Postby JIM CAROLAN » Wed Dec 23, 2009 10:47 pm

I have an indirect central heating system,I drained the system last summer to repair a radiator. On recommissioning the system I have lukewarm hot water in all taps and no heat in one radiator. I vented the radiator and it has no effect,if the primary circuit contains air how do I vent it?
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Simply Build It

Postby plumbbob » Thu Dec 24, 2009 9:49 am

Generally airlock associated with single radiators can be cleared by simply manually turning off all the other rads and switching to CH only on the timer (unless you have a combi). The increase in pressure will force the air into the rad.

There ought to be a bleed valve in the pipework near the top cylinder coil. If this does not expel the air, the only solution may be to crack open a nearby joint to allow the air to escape.
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