I have a new heating system with 6 zones using motorised valves for: UFH, 4x rad zones and HW. But when only UFH in kitchen on, the heat still transfers thru rad circuit and goes straight up to top of house. Thought the MV's when closed would have stopped the water getting hot, beyond the closed valve. It's not even as if it's being recycled as pump obviously not flowing the water. Anything I can do about it???
Heat loss in pipes
- Thread starter Deansplit
- Start date
Get it replumbed to stop the reverse circulation. A system that size should probably be on a header with NRV's fitted.
At least that's my best guess based on the info provided. Perhaps some pictures of the plant?
At least that's my best guess based on the info provided. Perhaps some pictures of the plant?
Non return valve. Also known as an anti-gravity valve.
If the flow pipes are still getting hot then perhaps the valve is passing.
If the flow pipes are still getting hot then perhaps the valve is passing.
But surely a NRV valve would be pointless as the heat is transferring in the direction of flow anyway. Do you mean the MV is still open slightly when you say 'passing'? But then the return pipes would be warm, no? I do have TRV's on all rads but I opened these to see if heat flowed through and it didn't...?
I am at a bit of a disadvantage not being able to see the installation...
But the clue is in the name - "anti gravity valve.
It helps prevent circulation under gravity.
But the clue is in the name - "anti gravity valve.
It helps prevent circulation under gravity.
Horse and stable... This should have been part of the initial design really, although it may be possible to chop one in without fully draining the system - again depending on the setup.
Well I designed it, and plumbed the entire house... 
Plumber only connected up the boiler and that was only to get the cert!
There's an MV on the 1st floor (3 story house) - I thought that heat wouldn't get past an MV when closed?
Plumber only connected up the boiler and that was only to get the cert! There's an MV on the 1st floor (3 story house) - I thought that heat wouldn't get past an MV when closed?
G
gaswizzard
Were all circuit returns bought back to common return?
Well I designed it, and plumbed the entire house...
There's an MV on the 1st floor (3 story house) - I thought that heat wouldn't get past an MV when closed?
Not much I can say then really.
Yes, it's a pretty simple installation: The whole system is controlled by 2x 3 zone Horstmann panels. From boiler - 28mm to pump, then tees off with 22 for UFH (only in kitchen/diner) with MV. The 28/rad flow has 4 MV's a various points to control ground floor, 1st floor front, 1ft floor rear & top floor. I then have one on the pressurised H/W cylinder which gets its flow from the same rad flow pipe, but before any of the rad MV's! That's about it, all returns back to boiler, naturally!
G
gaswizzard
Well , if you designed the whole system I guess it won't be too hard to find what the problem/s are. 
Well I designed it, and plumbed the entire house...
Plumber only connected up the boiler and that was only to get the cert!
Its nice to be able to have a laugh once in a while!
Perhaps next time you might choose to use a professional?
I am also wondering if a qualified person installed the unvented cylinder?
Tony
Yes it is a pretty simple system, but you have not designed it properly.
Naturally you plumbed all the returns properly.
Feel very sorry for your pump too. Poor little begger
.
Where's the by-pass?
Naturally you plumbed all the returns properly.
Feel very sorry for your pump too. Poor little begger
.Where's the by-pass?
DIYnot Local
Staff member
If you need to find a tradesperson to get your job done, please try our local search below, or if you are doing it yourself you can find suppliers local to you.
Select the supplier or trade you require, enter your location to begin your search.
Are you a trade or supplier? You can create your listing free at DIYnot Local