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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
Posted to uk.d-i-y
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Towel rail update
Well I replaced the old overheating element with a new adjustable
one that has a boost timer which is a much better idea. I was curious as to where the stat was in to old element as it just looked like a long road with an earth and two power connections. After a bit of hacksawing I extracted this which is, I presume, a 70C solid state stat of some sort. https://photos.app.goo.gl/67pbhzeAExkhMa3i8 https://photos.app.goo.gl/suTh6zDybC5aLshz6 There's also a thermal fuse hidden under the shroud that I didn't at first spot so I guess that would have provided major overheat protection. Oddly, the stat still seems to work although I haven't checked the temperature it switches off at there's no doubt that the rail was getting much much hotter than normal. Is it common (or even possible) for these stats to lose their "proper" switching temp? Tim -- |
#2
Posted to uk.d-i-y
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Towel rail update
On 02/08/2018 22:13, Tim+ wrote:
Well I replaced the old overheating element with a new adjustable one that has a boost timer which is a much better idea. I was curious as to where the stat was in to old element as it just looked like a long road with an earth and two power connections. After a bit of hacksawing I extracted this which is, I presume, a 70C solid state stat of some sort. https://photos.app.goo.gl/67pbhzeAExkhMa3i8 https://photos.app.goo.gl/suTh6zDybC5aLshz6 There's also a thermal fuse hidden under the shroud that I didn't at first spot so I guess that would have provided major overheat protection. Oddly, the stat still seems to work although I haven't checked the temperature it switches off at there's no doubt that the rail was getting much much hotter than normal. Is it common (or even possible) for these stats to lose their "proper" switching temp? No idea if the stat could lose its proper switching temp but thanks for the photos. -- Adam |
#3
Posted to uk.d-i-y
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Towel rail update
ARW Wrote in message:
On 02/08/2018 22:13, Tim+ wrote: Well I replaced the old overheating element with a new adjustable one that has a boost timer which is a much better idea. I was curious as to where the stat was in to old element as it just looked like a long road with an earth and two power connections. After a bit of hacksawing I extracted this which is, I presume, a 70C solid state stat of some sort. https://photos.app.goo.gl/67pbhzeAExkhMa3i8 https://photos.app.goo.gl/suTh6zDybC5aLshz6 There's also a thermal fuse hidden under the shroud that I didn't at first spot so I guess that would have provided major overheat protection. Oddly, the stat still seems to work although I haven't checked the temperature it switches off at there's no doubt that the rail was getting much much hotter than normal. Is it common (or even possible) for these stats to lose their "proper" switching temp? No idea if the stat could lose its proper switching temp but thanks for the photos. Well I'm perplexed. There is no doubt in our minds that the towel rail was overheating. It had never made "simmering" noises before or heated the room to a significant extent. It was doing both of those and felt much much hotter to touch. Today I got a glass lab thermometer and messed around with hot water and my multimeter. At 98c, stat contacts open. 90c, stat open, 80c, stat open. 69c, stat closed. 70c, stat open. So, in short, it seems to be behaving exactly to spec (assuming the 70c printed on the side is the opening temp). So, why was it overheating? Only thing I can think of is that the switching temp moves after a period of operation. Does this sound plausible? Tim -- |
#4
Posted to uk.d-i-y
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Towel rail update
"Tim+" wrote in message ... ARW Wrote in message: On 02/08/2018 22:13, Tim+ wrote: Well I replaced the old overheating element with a new adjustable one that has a boost timer which is a much better idea. I was curious as to where the stat was in to old element as it just looked like a long road with an earth and two power connections. After a bit of hacksawing I extracted this which is, I presume, a 70C solid state stat of some sort. https://photos.app.goo.gl/67pbhzeAExkhMa3i8 https://photos.app.goo.gl/suTh6zDybC5aLshz6 There's also a thermal fuse hidden under the shroud that I didn't at first spot so I guess that would have provided major overheat protection. Oddly, the stat still seems to work although I haven't checked the temperature it switches off at there's no doubt that the rail was getting much much hotter than normal. Is it common (or even possible) for these stats to lose their "proper" switching temp? No idea if the stat could lose its proper switching temp but thanks for the photos. Well I'm perplexed. There is no doubt in our minds that the towel rail was overheating. It had never made "simmering" noises before or heated the room to a significant extent. It was doing both of those and felt much much hotter to touch. Today I got a glass lab thermometer and messed around with hot water and my multimeter. At 98c, stat contacts open. 90c, stat open, 80c, stat open. 69c, stat closed. 70c, stat open. So, in short, it seems to be behaving exactly to spec (assuming the 70c printed on the side is the opening temp). So, why was it overheating? Only thing I can think of is that the switching temp moves after a period of operation. Does this sound plausible? Never seen one of those thermostats do that, but I spose its possible. Must be possible to measure its temperature set point now. |
#5
Posted to uk.d-i-y
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Towel rail update
On Sunday, 5 August 2018 21:23:32 UTC+1, Tim+ wrote:
ARW Wrote in message: On 02/08/2018 22:13, Tim+ wrote: Well I replaced the old overheating element with a new adjustable one that has a boost timer which is a much better idea. I was curious as to where the stat was in to old element as it just looked like a long road with an earth and two power connections. After a bit of hacksawing I extracted this which is, I presume, a 70C solid state stat of some sort. https://photos.app.goo.gl/67pbhzeAExkhMa3i8 https://photos.app.goo.gl/suTh6zDybC5aLshz6 There's also a thermal fuse hidden under the shroud that I didn't at first spot so I guess that would have provided major overheat protection. Oddly, the stat still seems to work although I haven't checked the temperature it switches off at there's no doubt that the rail was getting much much hotter than normal. Is it common (or even possible) for these stats to lose their "proper" switching temp? No idea if the stat could lose its proper switching temp but thanks for the photos. Well I'm perplexed. There is no doubt in our minds that the towel rail was overheating. It had never made "simmering" noises before or heated the room to a significant extent. It was doing both of those and felt much much hotter to touch. Today I got a glass lab thermometer and messed around with hot water and my multimeter. At 98c, stat contacts open. 90c, stat open, 80c, stat open. 69c, stat closed. 70c, stat open. So, in short, it seems to be behaving exactly to spec (assuming the 70c printed on the side is the opening temp). So, why was it overheating? Only thing I can think of is that the switching temp moves after a period of operation. Does this sound plausible? Tim bimetal stats can become sticky, sometimes sticking shut. NT |
#6
Posted to uk.d-i-y
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Towel rail update
wrote in message ... On Sunday, 5 August 2018 21:23:32 UTC+1, Tim+ wrote: ARW Wrote in message: On 02/08/2018 22:13, Tim+ wrote: Well I replaced the old overheating element with a new adjustable one that has a boost timer which is a much better idea. I was curious as to where the stat was in to old element as it just looked like a long road with an earth and two power connections. After a bit of hacksawing I extracted this which is, I presume, a 70C solid state stat of some sort. https://photos.app.goo.gl/67pbhzeAExkhMa3i8 https://photos.app.goo.gl/suTh6zDybC5aLshz6 There's also a thermal fuse hidden under the shroud that I didn't at first spot so I guess that would have provided major overheat protection. Oddly, the stat still seems to work although I haven't checked the temperature it switches off at there's no doubt that the rail was getting much much hotter than normal. Is it common (or even possible) for these stats to lose their "proper" switching temp? No idea if the stat could lose its proper switching temp but thanks for the photos. Well I'm perplexed. There is no doubt in our minds that the towel rail was overheating. It had never made "simmering" noises before or heated the room to a significant extent. It was doing both of those and felt much much hotter to touch. Today I got a glass lab thermometer and messed around with hot water and my multimeter. At 98c, stat contacts open. 90c, stat open, 80c, stat open. 69c, stat closed. 70c, stat open. So, in short, it seems to be behaving exactly to spec (assuming the 70c printed on the side is the opening temp). So, why was it overheating? Only thing I can think of is that the switching temp moves after a period of operation. Does this sound plausible? bimetal stats can become sticky, sometimes sticking shut. It isnt a bimetal stat. |
#7
Posted to uk.d-i-y
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Towel rail update
"lopt" Wrote in message:
wrote in message ... On Sunday, 5 August 2018 21:23:32 UTC+1, Tim+ wrote: ARW Wrote in message: On 02/08/2018 22:13, Tim+ wrote: Well I replaced the old overheating element with a new adjustable one that has a boost timer which is a much better idea. I was curious as to where the stat was in to old element as it just looked like a long road with an earth and two power connections. After a bit of hacksawing I extracted this which is, I presume, a 70C solid state stat of some sort. https://photos.app.goo.gl/67pbhzeAExkhMa3i8 https://photos.app.goo.gl/suTh6zDybC5aLshz6 There's also a thermal fuse hidden under the shroud that I didn't at first spot so I guess that would have provided major overheat protection. Oddly, the stat still seems to work although I haven't checked the temperature it switches off at there's no doubt that the rail was getting much much hotter than normal. Is it common (or even possible) for these stats to lose their "proper" switching temp? No idea if the stat could lose its proper switching temp but thanks for the photos. Well I'm perplexed. There is no doubt in our minds that the towel rail was overheating. It had never made "simmering" noises before or heated the room to a significant extent. It was doing both of those and felt much much hotter to touch. Today I got a glass lab thermometer and messed around with hot water and my multimeter. At 98c, stat contacts open. 90c, stat open, 80c, stat open. 69c, stat closed. 70c, stat open. So, in short, it seems to be behaving exactly to spec (assuming the 70c printed on the side is the opening temp). So, why was it overheating? Only thing I can think of is that the switching temp moves after a period of operation. Does this sound plausible? bimetal stats can become sticky, sometimes sticking shut. It isnt a bimetal stat. Um, I think actually it is. http://www.uchiya.co.jp/OtherContet/...glishHTML.html Tim -- |
#8
Posted to uk.d-i-y
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Towel rail update
On Monday, 6 August 2018 00:22:34 UTC+1, lopt wrote:
tabbypurr wrote in message ... On Sunday, 5 August 2018 21:23:32 UTC+1, Tim+ wrote: ARW Wrote in message: On 02/08/2018 22:13, Tim+ wrote: Well I replaced the old overheating element with a new adjustable one that has a boost timer which is a much better idea. I was curious as to where the stat was in to old element as it just looked like a long road with an earth and two power connections. After a bit of hacksawing I extracted this which is, I presume, a 70C solid state stat of some sort. https://photos.app.goo.gl/67pbhzeAExkhMa3i8 https://photos.app.goo.gl/suTh6zDybC5aLshz6 There's also a thermal fuse hidden under the shroud that I didn't at first spot so I guess that would have provided major overheat protection. Oddly, the stat still seems to work although I haven't checked the temperature it switches off at there's no doubt that the rail was getting much much hotter than normal. Is it common (or even possible) for these stats to lose their "proper" switching temp? No idea if the stat could lose its proper switching temp but thanks for the photos. Well I'm perplexed. There is no doubt in our minds that the towel rail was overheating. It had never made "simmering" noises before or heated the room to a significant extent. It was doing both of those and felt much much hotter to touch. Today I got a glass lab thermometer and messed around with hot water and my multimeter. At 98c, stat contacts open. 90c, stat open, 80c, stat open. 69c, stat closed. 70c, stat open. So, in short, it seems to be behaving exactly to spec (assuming the 70c printed on the side is the opening temp). So, why was it overheating? Only thing I can think of is that the switching temp moves after a period of operation. Does this sound plausible? bimetal stats can become sticky, sometimes sticking shut. It isnt a bimetal stat. I would expect it to be. NT |
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