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UK diy (uk.d-i-y) For the discussion of all topics related to diy (do-it-yourself) in the UK. All levels of experience and proficency are welcome to join in to ask questions or offer solutions. |
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#1
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New boiler undergassed. Blame gas meter governor?
I have just had a new Worcester-Bosch 24i system boiler installed in
the loft to replace a 30-year-old non-condensing boiler in the kitchen. Tests show it is "undergassed". The installer says it may be a problem with the gas meter governor, in which case they say Transco would have to fix it. However the 22mm pipe required by the boiler is connected to a 15mm pipe from the gas meter. Should the installer fit a larger pipe to the gas meter instead of blaming the governor and shifting the problem to Transco? Any advice most welcome. |
#2
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New boiler undergassed. Blame gas meter governor?
"ernie mendoza" wrote in message ... I have just had a new Worcester-Bosch 24i system boiler installed in the loft to replace a 30-year-old non-condensing boiler in the kitchen. Tests show it is "undergassed". The installer says it may be a problem with the gas meter governor, in which case they say Transco would have to fix it. However the 22mm pipe required by the boiler is connected to a 15mm pipe from the gas meter. Should the installer fit a larger pipe to the gas meter instead of blaming the governor and shifting the problem to Transco? Any advice most welcome. I'm about to have a similar change with a 30CDi - into the loft. Pipe sizes cannot be readily checked so I may have the same problems and will need an external 22mm up to the loft. Worcester will give good advice if you know the pressure at the boiler. I had this: "The recommended working gas pressure at the appliance is 18.0mbar however the boiler will function correctly when set as low as 16.5mbar. In most cases when testing the working gas pressure with other devices in the property this 22mm pipe diameter is necessary. Should your installer be able to achieve at least 16.5mbar on 15mm pipe-work then the manufacturers warranty should remain unaffected. " |
#3
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New boiler undergassed. Blame gas meter governor?
In article , John
Rumm writes On 25/06/2010 22:16, ernie mendoza wrote: I have just had a new Worcester-Bosch 24i system boiler installed in the loft to replace a 30-year-old non-condensing boiler in the kitchen. Tests show it is "undergassed". The installer says it may be a problem with the gas meter governor, in which case they say Transco would have to fix it. However the 22mm pipe required by the boiler is connected to a 15mm pipe from the gas meter. Should the installer fit a larger pipe to the gas meter instead of blaming the governor and shifting the problem to Transco? Any advice most welcome. Easy enough to check. Just work out if the pipework you have is adequate for the required flow rate. Look in your boiler manual[1] for the maximum gas flow rate required by the boiler in cubic metres per hour. Then use the pressure drop tables shown he http://www.copperinfo.co.uk/plumbing...downloads/pub- 124-copper-for-domestic-gas-installations.pdf To see if your pipework is adequate can deliver the required flow. [1] Available here if you have not got it: http://www.worcester-bosch.co.uk/ins...greenstar-24i- system In addition, if the installer is suggesting that the meter regulator is faulty then invite him to measure the pressure at the meter outlet test point with the o/p present and show that it is out of spec (20mbar +/-1mbar) with the boiler running flat out. O/P may need to watch out for smoke & mirrors at this point to avoid being duped by a dodgy measurement technique. Finger in the air suggests it should be 22mm to within 20cm of the boiler but nothing beats the full design process above. Good info here http://www.makewrite.demon.co.uk/GasFitting.html under: 3 Working on Gas Pipework a) What size pipes should be used for gas? -- fred FIVE TV's superbright logo - not the DOG's, it's ******** |
#4
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New boiler undergassed. Blame gas meter governor?
On 25 June, 22:16, ernie mendoza wrote:
I have just had a new Worcester-Bosch 24i system boiler installed in the loft to replace a 30-year-old non-condensing boiler in the kitchen. *Tests show it is "undergassed". *The installer says it may be a problem with the gas meter governor, in which case they say Transco would have to fix it. *However the 22mm pipe required by the boiler is connected to a 15mm pipe from the gas meter. *Should the installer fit a larger pipe to the gas meter instead of blaming the governor and shifting the problem to Transco? *Any advice most welcome. Instead of simply blaming the governeor he should fit his manometer to the test nipple on the meter and measure the pressure at the meter with the appliances running. Unles you live in a bugalow with the meter close below the boiler I would say the pipe is likely to require uprating. Transco will probably tell you the same thing |
#5
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New boiler undergassed. Blame gas meter governor?
On Jun 25, 4:16*pm, ernie mendoza wrote:
I have just had a new Worcester-Bosch 24i system boiler installed in the loft to replace a 30-year-old non-condensing boiler in the kitchen. *Tests show it is "undergassed". *The installer says it may be a problem with the gas meter governor, in which case they say Transco would have to fix it. *However the 22mm pipe required by the boiler is connected to a 15mm pipe from the gas meter. *Should the installer fit a larger pipe to the gas meter instead of blaming the governor and shifting the problem to Transco? *Any advice most welcome. What did the old boiler consume, the new unit is smaller and uses less gas, right. Was a Manometer used to test flow |
#6
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New boiler undergassed. Blame gas meter governor?
On Jun 25, 10:16*pm, ernie mendoza wrote:
the 22mm pipe required by the boiler is connected to a 15mm pipe from the gas meter. If the installers has fitted 15mm pipe from the gas meter, they have fitted too small a pipe. Which begs the question, is the person Gas Safe or sub-contracted from one who is? |
#7
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New boiler undergassed. Blame gas meter governor?
On Friday, 25 June 2010 22:16:34 UTC+1, ernie mendoza wrote:
I have just had a new Worcester-Bosch 24i system boiler installed in the loft to replace a 30-year-old non-condensing boiler in the kitchen. Tests show it is "undergassed". The installer says it may be a problem with the gas meter governor, in which case they say Transco would have to fix it. However the 22mm pipe required by the boiler is connected to a 15mm pipe from the gas meter. Should the installer fit a larger pipe to the gas meter instead of blaming the governor and shifting the problem to Transco? Any advice most welcome. As a GasSafe engineer. I would not leave any appliance attached to any gas pipe if the input pressure did not meet that specified in the Manufacturers Installation Instructions. If there was a problem with the meter governor, I would ask the O/P to attend. |
#8
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New boiler undergassed. Blame gas meter governor?
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#10
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New boiler undergassed. Blame gas meter governor?
On 13/07/2020 15:09, Fredxx wrote:
On 13/07/2020 14:48:15, Chris Hogg wrote: On Mon, 13 Jul 2020 05:45:29 -0700 (PDT), wrote: On Friday, 25 June 2010 22:16:34 UTC+1, ernie mendozaÂ* wrote: I have just had a new Worcester-Bosch 24i system boiler installed in the loft to replace a 30-year-old non-condensing boiler in the kitchen.Â* Tests show it is "undergassed".Â* The installer says it may be a problem with the gas meter governor, in which case they say Transco would have to fix it.Â* However the 22mm pipe required by the boiler is connected to a 15mm pipe from the gas meter.Â* Should the installer fit a larger pipe to the gas meter instead of blaming the governor and shifting the problem to Transco?Â* Any advice most welcome. As a GasSafe engineer. I would not leave any appliance attached to any gas pipe if the input pressure did not meet that specified in the Manufacturers Installation Instructions. If there was a problem with the meter governor, I would ask the O/P to attend. I imagine Mr Mendoza has either had it fixed or blown himself to smithereens in the intervening ten years... While you are correct, it is welcome to have someone this group who is both versed in gas and helpful. Elsewhere these two characteristics seem mutually exclusive. Yup helpful is good, but I would kind of hope one quality you can count on in a gas fitter is attention to detail :-) And yes, for the OP, his 24kW boiler will have a gas rate of around 2.2 m^3/hour [1]. And a 15mm pipe will not be able to supply that gas rate through 15mm pipe over an effective pipe length of much over 4m [2], which makes it unlikely that it would be ins spec at the time of fitting. [1] http://wiki.diyfaq.org.uk/index.php/Gas_units [2] http://wiki.diyfaq.org.uk/index.php/...ng#Design_Data -- Cheers, John. /================================================== ===============\ | Internode Ltd - http://www.internode.co.uk | |-----------------------------------------------------------------| | John Rumm - john(at)internode(dot)co(dot)uk | \================================================= ================/ |
#11
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New boiler undergassed. Blame gas meter governor?
This thread was resurrected from 2010. What's gone on this time?
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#12
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New boiler undergassed. Blame gas meter governor?
Cynic wrote:
This thread was resurrected from 2010. What's gone on this time? I suspect other web portals are copying Home Owners Hub and are presenting old messages as new. Cant be arsed to check though. ;-) Tim Packwood, maybe you could enlighten us? Tim -- Please don't feed the trolls |
#13
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New boiler undergassed. Blame gas meter governor?
Well back in 2010, I imagine its probably blown up by now anyway.
Brian -- ----- -- This newsgroup posting comes to you directly from... The Sofa of Brian Gaff... Blind user, so no pictures please Note this Signature is meaningless.! wrote in message ... On Friday, 25 June 2010 22:16:34 UTC+1, ernie mendoza wrote: I have just had a new Worcester-Bosch 24i system boiler installed in the loft to replace a 30-year-old non-condensing boiler in the kitchen. Tests show it is "undergassed". The installer says it may be a problem with the gas meter governor, in which case they say Transco would have to fix it. However the 22mm pipe required by the boiler is connected to a 15mm pipe from the gas meter. Should the installer fit a larger pipe to the gas meter instead of blaming the governor and shifting the problem to Transco? Any advice most welcome. As a GasSafe engineer. I would not leave any appliance attached to any gas pipe if the input pressure did not meet that specified in the Manufacturers Installation Instructions. If there was a problem with the meter governor, I would ask the O/P to attend. |
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