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NO I AM NOT AN UNDERFLOOR HEATING EXPERT!

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GH77 said:
Do you have access to Thermal imaging? . I've got a FLIR that plugs into the bottom of my phone, use it on UFH all the time, will show you where and how the heat is moving around, if you let the system all go cold then return the next day hopefully that will shed some light on the problem
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What model of flir have your got if you don't mind me asking
 
Flir One for ios, i've hire £4000 worth of Thermal imaging in the past and while the Flir is not at that level of imaging it's amazing value for money and definitely up to the job.... i had a job recently in a school that had 7 manifolds supplying 30 zones all with rf stats, the loops hadn't been laid to the drawings, but the stats had been associated to the drawing resulting in stats calling zones they weren't in .... I worked through the building one loop at a time tracing it's route with the Flir and marking up the manifolds, i then cleared the channels on the controllers and repaired all the stats correctly, was a long process and took 2 days, but couldn't have done it without thermal imaging and drastically cheaper than buying/ hiring a £4k camera 🙂
 
GH77 said:
Flir One for ios, i've hire £4000 worth of Thermal imaging in the past and while the Flir is not at that level of imaging it's amazing value for money and definitely up to the job.. i had a job recently in a school that had 7 manifolds supplying 30 zones all with rf stats, the loops hadn't been laid to the drawings, but the stats had been associated to the drawing resulting in stats calling zones they weren't in .. I worked through the building one loop at a time tracing it's route with the Flir and marking up the manifolds, i then cleared the channels on the controllers and repaired all the stats correctly, was a long process and took 2 days, but couldn't have done it without thermal imaging and drastically cheaper than buying/ hiring a £4k camera 🙂
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Thanks a lot for your reply is much appreciated. Do you remember what model it was ? Must have been a massive help and a relief for you
 
Is not a bad price if you need to use a flir camera. Does this model do the job if so that's not bad, I guess quite a good investment
 
Like Harvest said around £200 on Amazon ... I wouldn't be without mine now, i've now had 3 commercial UFH jobs sorting out systems that others have "commissioned " had one where there was a 240v actuator on a 24v system, the commissioning certificate had a flow Rate written on it! .... i'd like to know where they got that reading from ... i use mine to show the customer when I'm commissioning, they like seeing the loops heating up in the floor
 
It's not heating season, so the only demand on the primaries at this time of year, in your average household (correct me if this is not the case and the users are foreign) should be for hot water and reverse circulation would occur if the cylinder is not the last T on the boiler return, thus allowing hot primary return from the cylinder to find its way into the heating circuits.
 
Dilalio said:
It's not heating season, so the only demand on the primaries at this time of year, in your average household (correct me if this is not the case and the users are foreign) should be for hot water and reverse circulation would occur if the cylinder is not the last T on the boiler return, thus allowing hot primary return from the cylinder to find its way into the heating circuits.
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All of the returns now have non returns on them.
 
Harvest Fields said:
All of the returns now have non returns on them.
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Ok. Then it has to be a wiring issue and primary HW flow is getting to heating circuits via a mzv that is open when it shouldn't be... have you checked for this? Can you confirm that the problem occurs when there is a demand for HW only?
 
I do like your thinking. But It does not happen when the hot water is on. Only when the UFH is switched on?
 
Harvest Fields said:
I do like your thinking. But It does not happen when the hot water is on. Only when the UFH is switched on?
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Ok. Now getting more of the story which is probably in the previous posts but that's easy to miss until one joins the party😉
If this only happens on demand for UFH then what is the mzv for the rad curcuit doing at that call? Does it open up? Check wiring to it from stat(s) is there a backfeed that is energising it?
Maybe it's faulty and staying open. I'd isolate it electrically from the circuit and then fault find on it if the problem goes away during isolation.
 
Dilalio said:
Ok. Now getting more of the story which is probably in the previous posts but that's easy to miss until one joins the party😉
If this only happens on demand for UFH then what is the mzv for the rad curcuit doing at that call? Does it open up? Check wiring to it from stat(s) is there a backfeed that is energising it?
Maybe it's faulty and staying open. I'd isolate it electrically from the circuit and then fault find on it if the problem goes away during isolation.
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The heating circuit MZV is brand new. I fitted a new one from the suppliers incase the old one was temperamental and no power to the valve when UFH is on at all not even the 50/75volts you sometimes get when they are back feeding.
 
I recently had to use TI to locate my son's corn snake which had escaped in the car on the way back from the reptile shop he works at 🙂
 
So, not had chance to buy a TI as yet as so busy. But popped back to this job yesterday. To take a more in depth look. So I have some pictures and I known it is a mess but just after a bit of advice as UFH is NOT MY THING. If you think it is better for me to pass onto an UFH Engineer I will do so. Quick update all rads eventually come on with the UFH 2 port open. But not when the hot water 2 port is open.

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They haven't used an old feed from a rad to heat the underfloor/ supply the manifold have they?
 
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