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Discuss Ufh problems temp control and radiators temp in the Water Underfloor Heating Installations area at PlumbersForums.net

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Pkitch

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this is a screen shot of the instructions, maximum 45 degrees for my floor but I should be able to start much lower and work my way up to this temperature, from what I can gather many other people are able to operate their ufh systems at any temperature without having to turn the CH setting right down to minimum on the boiler
 

Craig Watson

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this is a screen shot of the instructions, maximum 45 degrees for my floor but I should be able to start much lower and work my way up to this temperature, from what I can gather many other people are able to operate their ufh systems at any temperature without having to turn the CH setting right down to minimum on the boiler
Your underfloor and radiator temp cannot be ran at separate temperature using the boiler controls. The only control you have of the underfloor heating water temp is with the blending valve at the manifold. Turn your boiler up, turn the blending valve to minimum and run your underfloor several times a day at 1 hour intervals and gradually increase the temp over 4 to 6 weeks.
 
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Pkitch

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Your underfloor and radiator temp cannot be ran at separate temperature using the boiler controls. The only control you have of the underfloor heating water temp is with the blending valve at the manifold. Turn your boiler up, turn the blending valve to minimum and run your underfloor several times a day at 1 hour intervals and gradually increase the temp over 4 to 6 weeks.
That’s my problem, the blending valve is set to minimum but the temperature is at maximum on the inlet gauge when my boiler is set normally, I’m guessing a faulty blending valve or installation issue?
 

Craig Watson

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So with your boiler set at max, and blending valve set at min, what temp is this gauge in the pic reading?

20190216_222655.jpg
 
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Pkitch

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Yes but when the boiler is turned up, are you saying that the temp of that gauge goes above the temp set by the blending valve?
When the boiler is set to normal 60 degrees the temp on that gauge is about 45 to 50 degrees which is or exceeds the maximum my floor can take, I should be able to run my boiler at normal settings and adjust the ufh blending valve to achieve a temperature lower than maximum, maybe I’m not getting this across clearly but for tiled screeded floors it is important to start off at a low temperature and gradually increase this which I am unable to do without turning down my settings on the boiler which in turn knocks out my radiators
 
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Pkitch

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Good man . the wallet always hurts .. don’t you know the name of the plumber?
Yes I have his name and number but I’m leaving it up to the builder to sort out, if I have to get another engineer out then the retained money won’t be paid
 

Craig Watson

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The blending valve should have a range of around 35 - 65 ° so if you can't regulate the temp down then there may be an installation issue or a fault with the blending valve. Ask your contractor to contact the manufacturer of the underfloor heating to get a rep out to check the system over.
 

Murdoch

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Yes I have his name and number but I’m leaving it up to the builder to sort out, if I have to get another engineer out then the retained money won’t be paid
A perfectly reasonable approach imho
 

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