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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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High return temperature on condensing boiler CH
Hi,
My boiler shows the return temperature of the CH on its display. Earlier today it was showing 75(C) which seems very hot. As it is a condensing boiler won't this mean it is operating outside its condensing mode? What is a good solution for this? I don't think the pump is adjustable. -- (\__/) M. (='.'=) Owing to the amount of spam posted via googlegroups and (")_(") their inaction to the problem. I am blocking most articles posted from there. If you wish your postings to be seen by everyone you will need use a different method of posting. See http://improve-usenet.org |
#2
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High return temperature on condensing boiler CH
Mark wrote:
Hi, My boiler shows the return temperature of the CH on its display. Earlier today it was showing 75(C) which seems very hot. As it is a condensing boiler won't this mean it is operating outside its condensing mode? What is a good solution for this? I don't think the pump is adjustable. Does if have a flow temperature adjustment? Was the house warm? Have you got Thermostatic radiator valves? What make and model is the boiler? How many rads? -- Cheers, John. /================================================== ===============\ | Internode Ltd - http://www.internode.co.uk | |-----------------------------------------------------------------| | John Rumm - john(at)internode(dot)co(dot)uk | \================================================= ================/ |
#3
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High return temperature on condensing boiler CH
"Mark" wrote in message ... Hi, My boiler shows the return temperature of the CH on its display. Earlier today it was showing 75(C) which seems very hot. As it is a condensing boiler won't this mean it is operating outside its condensing mode? Steam starts to condense at 100C. Most of it will have condensed at 75C. |
#4
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High return temperature on condensing boiler CH
On Wed, 29 Oct 2008 09:53:01 +0000, John Rumm
wrote: Mark wrote: Hi, My boiler shows the return temperature of the CH on its display. Earlier today it was showing 75(C) which seems very hot. As it is a condensing boiler won't this mean it is operating outside its condensing mode? What is a good solution for this? I don't think the pump is adjustable. Does if have a flow temperature adjustment? Yes. It's set to "E", if that's any help. Was the house warm? I would say it was nearly warm. Have you got Thermostatic radiator valves? Yes (except in room with thermostat). What make and model is the boiler? W-B Hiflow 440 How many rads? 13. -- (\__/) M. (='.'=) Owing to the amount of spam posted via googlegroups and (")_(") their inaction to the problem. I am blocking most articles posted from there. If you wish your postings to be seen by everyone you will need use a different method of posting. See http://improve-usenet.org |
#5
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High return temperature on condensing boiler CH
On Wed, 29 Oct 2008 10:39:13 -0000, "dennis@home"
wrote: "Mark" wrote in message .. . Hi, My boiler shows the return temperature of the CH on its display. Earlier today it was showing 75(C) which seems very hot. As it is a condensing boiler won't this mean it is operating outside its condensing mode? Steam starts to condense at 100C. Most of it will have condensed at 75C. I had heard that the flue gasses had to be below 55C to get the full benefit of the condensing mode. I read the following on several web sites: "It is only possible for a condensing boiler to work to these very high efficiencies if the flow and return pipework is also kept below 55°C." -- (\__/) M. (='.'=) Owing to the amount of spam posted via googlegroups and (")_(") their inaction to the problem. I am blocking most articles posted from there. If you wish your postings to be seen by everyone you will need use a different method of posting. See http://improve-usenet.org |
#6
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High return temperature on condensing boiler CH
"Mark" wrote in message ... On Wed, 29 Oct 2008 10:39:13 -0000, "dennis@home" wrote: "Mark" wrote in message . .. Hi, My boiler shows the return temperature of the CH on its display. Earlier today it was showing 75(C) which seems very hot. As it is a condensing boiler won't this mean it is operating outside its condensing mode? Steam starts to condense at 100C. Most of it will have condensed at 75C. I had heard that the flue gasses had to be below 55C to get the full benefit of the condensing mode. I read the following on several web sites: "It is only possible for a condensing boiler to work to these very high efficiencies if the flow and return pipework is also kept below 55°C." You can treat that with a pinch of salt. Most of the waste heat saved is the latent heat of vapourisation. If you condense most of the steam you get nearly all the heat back. Cooling the flu gases down to 55-60C will only get you a very small amount of energy back. You could say that the return temp should be kept to 40c as then it is even more efficient. However it comes at a cost.. bigger radiators and making (and running) them wastes energy. |
#7
Posted to uk.d-i-y
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High return temperature on condensing boiler CH
"Mark" wrote in message ... Hi, My boiler shows the return temperature of the CH on its display. Earlier today it was showing 75(C) which seems very hot. As it is a condensing boiler won't this mean it is operating outside its condensing mode? What is a good solution for this? I don't think the pump is adjustable. More info. What make model of boiler for starters and any info you have on it. |
#8
Posted to uk.d-i-y
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High return temperature on condensing boiler CH
"dennis@home" wrote in message ... "Mark" wrote in message ... Hi, My boiler shows the return temperature of the CH on its display. Earlier today it was showing 75(C) which seems very hot. As it is a condensing boiler won't this mean it is operating outside its condensing mode? Steam starts to condense at 100C. You got right, which is irrelevant to this point. Most of it will have condensed at 75C. This totally irrelevant too. |
#9
Posted to uk.d-i-y
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High return temperature on condensing boiler CH
"dennis@home" wrote in message ... "Mark" wrote in message ... On Wed, 29 Oct 2008 10:39:13 -0000, "dennis@home" wrote: "Mark" wrote in message ... Hi, My boiler shows the return temperature of the CH on its display. Earlier today it was showing 75(C) which seems very hot. As it is a condensing boiler won't this mean it is operating outside its condensing mode? Steam starts to condense at 100C. Most of it will have condensed at 75C. I had heard that the flue gasses had to be below 55C to get the full benefit of the condensing mode. I read the following on several web sites: "It is only possible for a condensing boiler to work to these very high efficiencies if the flow and return pipework is also kept below 55°C." You can treat that with a pinch of salt. Most of the waste heat saved is the latent heat of vapourisation. If you condense most of the steam you get nearly all the heat back. Cooling the flu gases down to 55-60C will only get you a very small amount of energy back. You could say that the return temp should be kept to 40c as then it is even more efficient. However it comes at a cost.. bigger radiators and making (and running) them wastes energy. 58C is the theoretical temperature in which flue gasses start to condense. In doing so they give off latent heat. The return water temperature needs to be about 54-55C to make the flue gasses condense. The energy clawed back is about 12% to the best non-condensing boiler. |
#10
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High return temperature on condensing boiler CH
In article , Mark
writes Hi, My boiler shows the return temperature of the CH on its display. Earlier today it was showing 75(C) which seems very hot. As it is a condensing boiler won't this mean it is operating outside its condensing mode? What is a good solution for this? I don't think the pump is adjustable. It sounds as if your system has not been balanced, many (lazy) installers say that this is not required on systems with TRVs which is not true. Follow the balancing procedure in the DIY faq at: http://www.diyfaq.org.uk/plumbing/he...ngsystems.html -- fred BBC3, ITV2/3/4, channels going to the DOGs |
#11
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High return temperature on condensing boiler CH
On Wed, 29 Oct 2008 18:09:43 +0000, fred wrote:
In article , Mark writes Hi, My boiler shows the return temperature of the CH on its display. Earlier today it was showing 75(C) which seems very hot. As it is a condensing boiler won't this mean it is operating outside its condensing mode? What is a good solution for this? I don't think the pump is adjustable. It sounds as if your system has not been balanced, many (lazy) installers say that this is not required on systems with TRVs which is not true. Follow the balancing procedure in the DIY faq at: http://www.diyfaq.org.uk/plumbing/he...ngsystems.html I did try to balance it, but had trouble getting good temperature readings. I bought an IR thermometer for this purpose. I can get stable temperature readings off everything but the ******* CH pipes. If I pointed it at them the reading was all over the place. -- (\__/) M. (='.'=) Owing to the amount of spam posted via googlegroups and (")_(") their inaction to the problem. I am blocking most articles posted from there. If you wish your postings to be seen by everyone you will need use a different method of posting. See http://improve-usenet.org |
#12
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High return temperature on condensing boiler CH
In article ,
Mark wrote: I did try to balance it, but had trouble getting good temperature readings. I bought an IR thermometer for this purpose. I can get stable temperature readings off everything but the ******* CH pipes. If I pointed it at them the reading was all over the place. Put some black PVC tape round the pipe and measure on that. -- *It was recently discovered that research causes cancer in rats* Dave Plowman London SW To e-mail, change noise into sound. |
#13
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High return temperature on condensing boiler CH
On 29 Oct, 18:09, fred wrote:
In article , Mark writesHi, My boiler shows the return temperature of the CH on its display. Earlier today it was showing 75(C) which seems very hot. *As it is a condensing boiler won't this mean it is operating outside its condensing mode? What is a good solution for this? *I don't think the pump is adjustable. It sounds as if your system has not been balanced, many (lazy) installers say that this is not required on systems with TRVs which is not true. Follow the balancing procedure in the DIY faq at:http://www.diyfaq.org.uk/plumbing/he...ngsystems.html The installers put a TRV on the return and a lock-shield on the flow of one of my rads. Will this cause an issue where balancing is concerned? Thanks, Jon |
#14
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High return temperature on condensing boiler CH
Jon wrote:
On 29 Oct, 18:09, fred wrote: In article , Mark writesHi, My boiler shows the return temperature of the CH on its display. Earlier today it was showing 75(C) which seems very hot. As it is a condensing boiler won't this mean it is operating outside its condensing mode? What is a good solution for this? I don't think the pump is adjustable. It sounds as if your system has not been balanced, many (lazy) installers say that this is not required on systems with TRVs which is not true. Follow the balancing procedure in the DIY faq at:http://www.diyfaq.org.uk/plumbing/he...ngsystems.html The installers put a TRV on the return and a lock-shield on the flow of one of my rads. Will this cause an issue where balancing is concerned? Not really. Some TRVs used to not like being on the return, but most are bidirectional these days. Makes no difference to balancing though. -- Cheers, John. /================================================== ===============\ | Internode Ltd - http://www.internode.co.uk | |-----------------------------------------------------------------| | John Rumm - john(at)internode(dot)co(dot)uk | \================================================= ================/ |
#15
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High return temperature on condensing boiler CH
On 31 Oct, 00:10, John Rumm wrote:
Jon wrote: On 29 Oct, 18:09, fred wrote: In article , Mark writesHi, My boiler shows the return temperature of the CH on its display. Earlier today it was showing 75(C) which seems very hot. *As it is a condensing boiler won't this mean it is operating outside its condensing mode? What is a good solution for this? *I don't think the pump is adjustable. It sounds as if your system has not been balanced, many (lazy) installers say that this is not required on systems with TRVs which is not true. Follow the balancing procedure in the DIY faq at:http://www.diyfaq.org..uk/plumbing/h...ngsystems.html The installers put a TRV on the return and a lock-shield on the flow of one of my rads. Will this cause an issue where balancing is concerned? Not really. Some TRVs used to not like being on the return, but most are bidirectional these days. Makes no difference to balancing though. -- Cheers, John. Thanks John. |
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