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Discuss Piped hot water underfloor heating problem seperate to grant combi boiler - Please, please help!!!! in the Plumbing Jobs | The Job-board area at PlumbersForums.net

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bobby13

Hi,
Please can someone try to help me with an ongoing problem that I have with my heating system. I’ll try to explain as clearly as possible -
I live in a new build detached house (built 2.5 years ago), which is a 2 story brick building. The ground floor has 2 stables, a barn, tack room (with boiler located in it) and a hallway/utility room. The first floor has a large bedroom, medium sized bathroom and large open plan kitchen/lounge.
The ground floor has a radiator in the hallway and a radiator in the utility room, both of them get nice and hot easily and have their thermostats set low as we spend 99% of our time on the first floor so don‘t really need the ground floor to be heated. There are obviously no radiators in the barn or stables! The tack room stays nice and warm as the boiler is located within it.
The entire first floor is heated by a piped hot water underfloor heating system (i.e. not electric). The pipes are plastic and are set within a specialist screed that topped the suspended concrete floor. The floor covering is engineered wood flooring throughout.
I believe there are 4 separate pipe zones or circuits that make up the first floor underfloor heating system. The boiler situated in the tack room on the ground floor is powered by heating oil and is a large ‘Grant’ boiler.
Now for the problem -
The floor in (the majority) of the lounge/kitchen gets lovely and warm quite easily and stays warm, which heats that room quite nicely. However, there is a small part of that room that has a virtually stone cold piece of floor.
The bathroom is also nice and warm, except for a very small part that doesn’t get warm.
The bedroom never gets more than luke warm and the vast majority of the time is stone cold.
It seems to me that there must be something wrong with the circulation of the hot water in some of the 4 circuits that make up the first floor system. I suspect there are 2 circuits that do not have hot water passing through them properly.
The plumber/heating engineer who fitted the system has been back to it on about 6 occasions since the install and has done the following, all of which have failed to fix the problem -
1. Flushed/bled the entire system on at least 4 separate occasions
2. Replaced the electric pump that I presume helps to circulate the water round the system
I’m really getting fed up with it now as it is no fun sleeping in a un-heated bedroom especially in this weather!!!
The electronic thermostat controller is set to 18c throughout the day and night and 21.5c during the morning and evening hours.
I wonder if the electric pump is situated in the wrong place on the system?
Any help is greatly appreciated!
 
can you see the manifold? where all the underfoor circits come together? on the manifold there may be flow gauges for ballancing the system, if on circuits not working one of the flow guages will be on zero.
 
Agree with ecowarm,first port of call is the manifold. I assume the system was balanced when it was first turned on. Are all the actuators opening?
 
another possibility maybe where the floor is cold there aren't actually any pipes as op said small areas cold. if an airlock or blockage more of the floor would be cold wouldnt it? just a thought.
 
Thanks for the quick replies -

Is there a way that I can upload some photos that I have taken of the manifold, boiler etc?

The whole floor was covered by the pipes there should be no cold areas, plus the entire bedroom is cold!!
 
I work quite a bit on underfloor heating as said there should be flow meters on manifolds
There should be 2 pumps 1 as a shunt pump to underfloor pump if as you said pipes covered all floor area then there should be no cold spots but could be different circuits in rooms
What sort of underfloor system do you have installed
What area are you in?
 
I'm trying to upload some photos of the system, which will probably be easier than me trying to explain whats what.
 
Photos emailed to Gray0689, hopefully he'll have more luck uploading them to the thread than me
 
Sorry can't upload them for some reason
What you seem to have is a 4 branch underfloor manifold with multi layered pipe

There does not seem to be any actuater heads on manifold so I don't know how you can control the temp through stats

No flow meters the only thing I could say is you will have to try and ballance the circuits by adjusting the white screw caps on the lower manifold (looks as though the 3rd one across from pump is closed more than rest)
I see a few wires are they from stats just not wired to anything??

You could try opening one at a time and closing others then you can see what circuit is for what rooms and it might release any air locks
Make sure air bleeders cap is loose

The top manifold just seems to be your domestic water from combi
 
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Reply to Piped hot water underfloor heating problem seperate to grant combi boiler - Please, please help!!!! in the Plumbing Jobs | The Job-board area at PlumbersForums.net

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