Ok let's make some sense of this.
The boiler requires a nominal 20mb working gas supply at the boiler isolation valve, ie the end of your gas supply pipework before it enters the appliance. The only way to measure this is to cut a tee in with a test point before the isolation valve. This pressure should be at most 1mb less than the measured working pressure at the gas meter test point. As this can quite legally be 19mb, 18mb measured at the point it enters the appliance is the minimum allowed. Taking into account the drop through the internal gas anaconda, gas valve and in built filter, this equates to 15mb measured at the gas valve inlet test point. The confusion arises because the test point is not actually at the appliance inlet, its a way along the gas 'train'.
The pressure measured at the gas meter depends on a lot of things. What is the actual district supply pressure? It could be 22mb at the ECV, it could be 72mb, who knows. It could be a E6, a U6, all with different losses across the meter. That's why gas rating the boiler is important.
In the case here the noise has NOTHING to do with the working pressure being marginal. In fact the boiler should be very slightly quieter if the heat input was less than it should be. As we've all said before its debris in the main heat exchanger. Basic.
Ok let's make some sense of this.
The boiler requires a nominal 20mb working gas supply at the boiler isolation valve, ie the end of your gas supply pipework before it enters the appliance. The only way to measure this is to cut a tee in with a test point before the isolation valve. This pressure should be at most 1mb less than the measured working pressure at the gas meter test point. As this can quite legally be 19mb, 18mb measured at the point it enters the appliance is the minimum allowed. Taking into account the drop through the internal gas anaconda, gas valve and in built filter, this equates to 15mb measured at the gas valve inlet test point. The confusion arises because the test point is not actually at the appliance inlet, its a way along the gas 'train'.
The pressure measured at the gas meter depends on a lot of things. What is the actual district supply pressure? It could be 22mb at the ECV, it could be 72mb, who knows. It could be a E6, a U6, all with different losses across the meter. That's why gas rating the boiler is important.
In the case here the noise has NOTHING to do with the working pressure being marginal. In fact the boiler should be very slightly quieter if the heat input was less than it should be. As we've all said before its debris in the main heat exchanger. Basic.
Thanks for the reply
I was not suggesting the pressure was causing the noise problem, just trying to check if a safety issue or not
What a mare, heading for visit number six!
Yes there is and had you been familiar with these boilers then you would know , same would apply with regard to the updated MI's.
Again had you been familiar with these boilers then this may not be the case.
that was not the intention, just pointing out facts, mr 831 is very good at gettin his point over, but u told me I was wrong , I wasn't you said I work for BG I don't... It's just important to get the facts right, an if you start laying the law down an ranting about stuff u gotter be sure of ur ground. An goin back to the original fault why didn't BG do there job an change that bloody ht exch? An as for technical saying turn down to 8% co2 that just about sums them up.. if the truth be known
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