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Post by pawleyplumber on Jan 7, 2021 21:29:45 GMT
hello all
now i aint really done any underfloor heating jobs. and i have been called out to a underfloor heating heating job that's not getting hot, been in for about 5 years working fine.
not sure what is up with it the flow to the manifold is not very hot but the return is boiling. i have checked the 2 port valve to make sure its flowing through when calling for heat but it doesn't only if i turn the pump to speed 1 the flow starts to get hot on the manifold and the floor heats up a tiny but not all of the floor. soon as i put the pump on 2 or 3 speed (normally set to 3 ) the flow goes freezing and the return goes red hot and freezing cold floor.
I'm not sure on how the underfloor manifold works, the return thermostat heads i took off and the pins don't really move much at all so dont know if i can replace just the actuator pins or do they come with the manifold.
would airlocks cause these symptoms. cheers and appreciate any suggestions. and happy new year all.
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Post by tomplum on Jan 7, 2021 21:43:47 GMT
Hi Pauly , like you I have't done much underfloor heating, in fact i hav't done any, there's no call in my neck of the woods due to cost, I would say you are right in thinking is a moving part, like a valve because if its been working for 5 years without airlocking before, its unlikely now , but I'm assuming its ground floor and there are rads above to collect any air, I'm hoping our specialist Dick may be able to help you more and a happy new covid free New year to you too.  |
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Post by pawleyplumber on Jan 7, 2021 22:14:30 GMT
cheers tom yeah the underfloor heating is in the dining room and kitchen downstairs 1 big room but on 2 separate flows and returns think because how big the room is they have put it on 2 pipes for 1 room. and there is quite a lot of ufh around these ends but not really got into them but looking at joining a course this year some point to know more about it and fault find and probs put the odd one in eventually and first job i get back from starting again from new year after getting covid me self just before Christmas had to stay off untill today first day back .  |
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Post by dickpuller on Jan 7, 2021 22:46:31 GMT
cheers tom yeah the underfloor heating is in the dining room and kitchen downstairs 1 big room but on 2 separate flows and returns think because how big the room is they have put it on 2 pipes for 1 room. and there is quite a lot of ufh around these ends but not really got into them but looking at joining a course this year some point to know more about it and fault find and probs put the odd one in eventually and first job i get back from starting again from new year after getting covid me self just before Christmas had to stay off untill today first day back . Let me get back to you tomorrow👍👍 |
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Post by crowsfoot on Jan 8, 2021 9:41:28 GMT
hello all now i aint really done any underfloor heating jobs. and i have been called out to a underfloor heating heating job that's not getting hot, been in for about 5 years working fine. not sure what is up with it the flow to the manifold is not very hot but the return is boiling. i have checked the 2 port valve to make sure its flowing through when calling for heat but it doesn't only if i turn the pump to speed 1 the flow starts to get hot on the manifold and the floor heats up a tiny but not all of the floor. soon as i put the pump on 2 or 3 speed (normally set to 3 ) the flow goes freezing and the return goes red hot and freezing cold floor. I'm not sure on how the underfloor manifold works, the return thermostat heads i took off and the pins don't really move much at all so dont know if i can replace just the actuator pins or do they come with the manifold. would airlocks cause these symptoms. cheers and appreciate any suggestions. and happy new year all. Hi Paul, Mr Sod always strikes in plumbing just when you want an easy return to work day. The only underfloor that I ever get to is in a training center that my firm maintains. The electrician usually diagnoses the problem and I fit a new part. It does sound like an M.V not opening though. The heat appears to be trying to go in reverse round the circuit. I wouldn't think it could be an air-lock. What's the heat source? Sorry I'm no more help than this |
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Post by dickpuller on Jan 8, 2021 10:46:14 GMT
Perhaps this video will help in explaining the basic concept & installation of UFH. Don’t get caught up in the methods of ‘Loop’ installation. That’s not our concern in this instance.
You clearly have a circulation fault, which can be a result of a few things;
Faulty/jammed Zone valve, limiting circulation to the manifold.
A faulty circulation pump on the manifold.
A blocked Primary pipe leading to the manifold.
A faulty blending valve on the manifold.
Air Lock in the Loops.
Shit in the Loops.
Etc etc etc.
Don’t be intimidated by the system, it’s all just simple circulation & temperature control. Like any system with a water medium running through it, it suffers the exact same problems👍
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Post by pawleyplumber on Jan 10, 2021 17:37:28 GMT
Thanks for the replies. Crowsfoot the boiler is just above the manifold about 4ft and when the pups on one flow gets hot past the port valve but when on 3 it's goes freezing.so I'm think I need to go back again and investigate more. I changed the head of the 2 port valve few months ago because that stopped working but didn't change the body so could be passing slightly but not fully. And there is a spare connection on the manifold so going to swap the thermostat return pin for the one that's not being used and see if I can eliminate any issues before chucking money at it.
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