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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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Pump overrun
I have an old Servowarm Elite 50 Central heating boiler and the pump failed. I have replaced the pump but the Pump does not shut down when the boiler turns off. Does anyone know, if I purchase a new programmer, if this has the pump overrun facility on it or do I have to find the fault, "solenoid or relay?" in the original Timer/programmer. Thanks -- Nigel Hewer |
#2
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Pump overrun
In article ,
Nigel Hewer wrote: I have an old Servowarm Elite 50 Central heating boiler and the pump failed. I have replaced the pump but the Pump does not shut down when the boiler turns off. Do you mean when the boiler is switched off by the programmer? Older systems will often have the pump running while the boiler cycles. On those the two aren't really interdependent - the pump is controlled by the room stat while the boiler by its own. Does anyone know, if I purchase a new programmer, if this has the pump overrun facility on it or do I have to find the fault, "solenoid or relay?" in the original Timer/programmer. Pump overrun devices are usually part of the boiler rather than programmer. Of course Servowarm tended to have a mind of their own. ;-) -- *Do they ever shut up on your planet? Dave Plowman London SW To e-mail, change noise into sound. |
#3
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Pump overrun
On Sun, 26 Nov 2006 10:17:45 +0000, Dave Plowman (News) wrote:
In article , Nigel Hewer wrote: I have an old Servowarm Elite 50 Central heating boiler and the pump failed. I have replaced the pump but the Pump does not shut down when the boiler turns off. Do you mean when the boiler is switched off by the programmer? Older systems will often have the pump running while the boiler cycles. On those the two aren't really interdependent - the pump is controlled by the room stat while the boiler by its own. Does anyone know, if I purchase a new programmer, if this has the pump overrun facility on it or do I have to find the fault, "solenoid or relay?" in the original Timer/programmer. Pump overrun devices are usually part of the boiler rather than programmer. Of course Servowarm tended to have a mind of their own. ;-) They were (are?) specialists in rebadging and used reasonable kit from major manufactuers including Aqualisa shower mixers. My wild guess is that this might be a rebadged Ideal Elite such a boiler could well have an overrun implemented as a simple temperture sensitive changeover switch. It has become stuck in the hot over-run position. -- Ed Sirett - Property maintainer and registered gas fitter. The FAQ for uk.diy is at http://www.diyfaq.org.uk Gas fitting FAQ http://www.makewrite.demon.co.uk/GasFitting.html Sealed CH FAQ http://www.makewrite.demon.co.uk/SealedCH.html Choosing a Boiler FAQ http://www.makewrite.demon.co.uk/BoilerChoice.html Gas Fitting Standards Docs he http://www.makewrite.demon.co.uk/GasFittingStandards |
#4
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Pump overrun
In message , "Dave Plowman (News)"
writes In article , Nigel Hewer wrote: I have an old Servowarm Elite 50 Central heating boiler and the pump failed. I have replaced the pump but the Pump does not shut down when the boiler turns off. Do you mean when the boiler is switched off by the programmer? Older systems will often have the pump running while the boiler cycles. On those the two aren't really interdependent - the pump is controlled by the room stat while the boiler by its own. Does anyone know, if I purchase a new programmer, if this has the pump overrun facility on it or do I have to find the fault, "solenoid or relay?" in the original Timer/programmer. Pump overrun devices are usually part of the boiler rather than programmer. Of course Servowarm tended to have a mind of their own. ;-) I'm just wondering if his timer is a Horstman 424 - one version of which (the emerald?) had a bimetalic pump overrun integrated into it OP - you are just going to have to dig in a bit deeper and have a look -- geoff |
#6
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Pump overrun
In message , Nigel
Hewer writes Pump overrun devices are usually part of the boiler rather than programmer. Of course Servowarm tended to have a mind of their own. ;-) I'm just wondering if his timer is a Horstman 424 - one version of which (the emerald?) had a bimetalic pump overrun integrated into it Thanks for everyones comments. My system does not have a room stat and on closer inspection of the timeclock have noticed a bi-metallic strip that is broken (thanks geoff) Could I replace this or replace the timeclock? Any ideas where I might get one? If there had been one person in the UK who might have had one, it would have been me I don't You are (as they say) buggered there are some solutions, but you're better off being told by one of the fitters who frequent this NG -- geoff |
#7
Posted to uk.d-i-y
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Pump overrun
Nigel Hewer wrote: I have an old Servowarm Elite 50 Central heating boiler and the pump failed. I have replaced the pump but the Pump does not shut down when the boiler turns off. Does anyone know, if I purchase a new programmer, if this has the pump overrun facility on it or do I have to find the fault, "solenoid or relay?" in the original Timer/programmer. Thanks -- Nigel Hewer My room stat controls the pump only and the boiler is controlled by it's own stat. If the boiler stat has shut off the boiler and the room stat is calling for heat the pump continues to run. |
#8
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Pump overrun
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#9
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Pump overrun
Geronimo W. Christ Esq wrote: wrote: My room stat controls the pump only and the boiler is controlled by it's own stat. If the boiler stat has shut off the boiler and the room stat is calling for heat the pump continues to run. So the pump stops allowing the boiler to heat really quickly and then shut itself off ? That sounds very dodgy indeed. My boiler would shutdown and require resetting if I were to do that. Quite a common arrangement for older systems. When the heating demand is satisfied the pump is switched off by the roomstat and the boiler then continues to run until the water temperature in the boiler rises high enough for the boiler stat to shut it off. Conversely if the boiler water temperature reaches the boiler stat setting before the heating load is satisfied the pump will continue to run although the boiler has shut off. In fact some vintage heating systems have no roomstat at all and the heating is controlled by the boiler stat alone. |
#10
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Pump overrun
In article ,
"Geronimo W. Christ Esq" writes: wrote: My room stat controls the pump only and the boiler is controlled by it's own stat. If the boiler stat has shut off the boiler and the room stat is calling for heat the pump continues to run. So the pump stops allowing the boiler to heat really quickly and then shut itself off ? That sounds very dodgy indeed. Depends on the boiler's water content, and this was the norm with higher water content boilers. -- Andrew Gabriel |
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