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nowucit
Serviced the above the other day which I was told hadn't been serviced for around 4 years and before that BG has done it on contract and were in and out in 10 mins.
MI states fan pressure should read negative - 3.9mb or greater, pressures measured below this figure indicate the heat exchanger will need cleaning.
Fan pressure was -5.87
FGA readings show CO2 10.1, CO 50ppm, Ratio 0.0004
I decided to give the boiler a full strip and clean anyway as I had not done one before and the CO2 was a bit higher than MI stated 9.6 max, 9.0 min.
When I opened up the combustion chamber to clean the heat exchanger the attached picture is what I found which to me looks like it was in need of a pretty good clean. Which then led me to wonder what state it might have been in if I had left it based on fan pressure or simply adjusted the CO2 levels to bring it down. I also wondered if this might be one of the reasons why some engineers are routinely setting CO2 levels wrongly as I hear on the boards.
For information, when I gave the heat exchanger a good clean the CO2 level dropped down to 9.6
Thought it might be a good point for discussion as I'm new to the trade and would value your views. Would be also interested as to the reasons why engineers are commonly adjusting levels wrongly so I don't fall down the same hole.
MI states fan pressure should read negative - 3.9mb or greater, pressures measured below this figure indicate the heat exchanger will need cleaning.
Fan pressure was -5.87
FGA readings show CO2 10.1, CO 50ppm, Ratio 0.0004
I decided to give the boiler a full strip and clean anyway as I had not done one before and the CO2 was a bit higher than MI stated 9.6 max, 9.0 min.
When I opened up the combustion chamber to clean the heat exchanger the attached picture is what I found which to me looks like it was in need of a pretty good clean. Which then led me to wonder what state it might have been in if I had left it based on fan pressure or simply adjusted the CO2 levels to bring it down. I also wondered if this might be one of the reasons why some engineers are routinely setting CO2 levels wrongly as I hear on the boards.
For information, when I gave the heat exchanger a good clean the CO2 level dropped down to 9.6
Thought it might be a good point for discussion as I'm new to the trade and would value your views. Would be also interested as to the reasons why engineers are commonly adjusting levels wrongly so I don't fall down the same hole.
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