loss of pressure from central heating system

taydo · 4 Aug 2005

Hi all went to a house recently customer complained about constant pressure drop in central heating she has had two new rads fitted and the problem started from that point. No I didnt fit them

the prv is ok
there is no water showing from the pressure vessel
no apparent water leaks

Im lost any ideas please

Brian

ordo · 4 Aug 2005

There is definetaly a leak. Need to find it??????????????

chrishutt · 4 Aug 2005

Ordo's right.

A good way to start locating such a leak is to close the flow and return isolating valves under the boiler (assuming there are some) and see if the boiler pressure gauge continues to show a drop. If so the problem is obviously with the boiler (prv valve, auto air vent?). If not, observe what happens when isolating valves are reopened. If there is a sudden pressure drop, this shows that leak is in system external to boiler.

Of course you can't use heating during such a test (which might be over a few days), but that's not a problem in August.

ordo · 4 Aug 2005

chrishutt said:
Ordo's right.

A good way to start locating such a leak is to close the flow and return isolating valves under the boiler (assuming there are some) and see if the boiler pressure gauge continues to show a drop. If so the problem is obviously with the boiler (prv valve, auto air vent?). If not, observe what happens when isolating valves are reopened. If there is a sudden pressure drop, this shows that leak is in system external to boiler.

Of course you can't use heating during such a test (which might be over a few days), but that's not a problem in August.

Bang on chrishutt, This is an excellent way to test and you should get results.

taydo · 4 Aug 2005

Yes good idea thanks

ChrisR · 4 Aug 2005

The only snag could be that there probably WILL be a leak, then, from

the flow and return isolating valves under the boiler

oilman · 5 Aug 2005

Some operators think it shouldn't be used, but leak sealer is useful, it will often cure the leak, wherever it happens to be, and it's more cost effective than your time spent looking. (Unless the customer is rich and wants to pay you lots justy to find it. Often they don't ).

taydo · 5 Aug 2005

Thanks leak sealer could be the best option

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loss of pressure from central heating system

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