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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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Central Heating "motorised valve"
Apologies for probably not using the right technical terms...I'm not a
plumber. However, I appear to be having issues with the motorised valve thingy on my heating system. Before calling out a plumber, I'd like to know more about it, and likely causes of problems. The problem is that it switches from heating to hot water OK, but no matter what I try, it will not switch from HW to heating automatically - I have to use the little lever on it to move it back. Is this a wiring issue, or just a knackered valve ? TIA, Ian |
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Ian Cornish presented the following explanation :
Apologies for probably not using the right technical terms...I'm not a plumber. However, I appear to be having issues with the motorised valve thingy on my heating system. Before calling out a plumber, I'd like to know more about it, and likely causes of problems. The problem is that it switches from heating to hot water OK, but no matter what I try, it will not switch from HW to heating automatically - I have to use the little lever on it to move it back. Is this a wiring issue, or just a knackered valve ? TIA, Ian The 'motorised bit' is called the actuator. It is probably the actuator sticking and is in need of replacement. Is it a spring return type? -- Regards, Harry (M1BYT) (L) http://www.ukradioamateur.org |
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In an earlier contribution to this discussion,
Ian Cornish" "icornish at talk21 dot com "icornish at talk21 dot com" wrote: Apologies for probably not using the right technical terms...I'm not a plumber. However, I appear to be having issues with the motorised valve thingy on my heating system. Before calling out a plumber, I'd like to know more about it, and likely causes of problems. The problem is that it switches from heating to hot water OK, but no matter what I try, it will not switch from HW to heating automatically - I have to use the little lever on it to move it back. Is this a wiring issue, or just a knackered valve ? TIA, Ian Has it *ever* worked properly? If so, it's probably a dicky motor in the actuator - which is supposed to motor the valve from the HW-only through the HW+CH position to the CH-only position. The motor only works in one direction - the return being provided by a spring. [If it's *never* worked, it could be wired wrongly. Have a look at the Y-Plan wiring in http://content.honeywell.com/uk/homes/systems.htm ] In many cases, you can remove the actuator (the electrical bit) from the top of the valve, revealing a spindle with a flat bit on it. You should be able to rotate the spindle through 90 degrees from the HW to the CH position without too much effort. It *could* be seized, but your problem is most likely to be the actuator. You can replace the actuator without needing to drain the wet part of the system - but pay particular attention to the wiring, and connect the new one up exactly the same. -- Cheers, Set Square ______ Please reply to newsgroup. Reply address is invalid. |
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