just over 5mb working pressure on inlet on a vaillant turbomax 282........

moogwai · Jan 17, 2012

......but 21mb at meter with a pipe run of 22mm for about 5m with 4 elbows and 0.5m of 15mm into boiler!! could this be a faulty gas valve rather than a pipe sizing issue? any thoughts lads?

don't think its a regulator problem as its 20mb at the meter when boiler is on.

AWheating · Jan 17, 2012

probably a blockage somewhere, maybe even carbon build up from main. drop a test point into gas pipework just before boiler iso valve and test. If you still have 5mb then its pipework problems.

diamondgas · Jan 17, 2012

:iagree: had a cupl gas valves fill with grime from the gas supply! May be worth as said or removing the gas valve to see if it has a filter and if so if it is blocked 🙂

moogwai · Jan 17, 2012

Cheers lads.....what fittings do I use to make the test point? Is there a tee you can buy with one built in?

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aggis · Jan 17, 2012

Is the 5mb w/p burner or inlet of gas valve ?

moogwai · Jan 17, 2012

aggis said:
Is the 5mb w/p burner or inlet of gas valve ?

Inlet of gas valve mate.

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aggis · Jan 17, 2012

Got to be on pipework, are there other appliances & what pressures are they ?
If they're ok, it's got to be after the tee to that appliance, don't suppose the pipes are exposed [would be too simple!]
If they're low it's before their connecting tee.

mikegas · Jan 17, 2012

These are test points mate http://www.bes.co.uk/products/048.asp

moogwai · Jan 17, 2012

aggis said:
Got to be on pipework, are there other appliances & what pressures are they ?
If they're ok, it's got to be after the tee to that appliance, don't suppose the pipes are exposed [would be too simple!]
If they're low it's before their connecting tee.

must admit there is a fire but didn't test that....it wasn't running at the same time as the boiler. Gonna have a word with the landlord and go back spend a few hours there will take out gas valve and check for a filter and fit a test point just under the boiler. if thats no good then i'll put a new gas run in. Thanks for your input lads.