S
Stevemarch1969
Apologies, reposted in central heating forum.
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Discuss New radiator in loft causing problems in the Plumbing Jobs | The Job-board area at PlumbersForums.net
The only correct way of sorting it out is to run the return from the rad back to the heating circuit. An easy solution would be to take the connection from the rad before the 3 port so that it is on whenever the heating or hot water is on and fit a TRV. Alternatively run it from the hot water circuit so it comes on with the hot water.
Not the best solution but the least disruptive.
3 position mid position 3 port valve is :
hw only
ch only
hw and ch at the same time
2 position diverter 3 port valve is :
hw only
ch and hot water at the same time
can you select CH ONLY from programmer and run it independently without the need for HW to be on too ?
i did not ask my Q correctly
If you select CH only does boiler works and you get CH , or do you have to have hot water selected at the same time to have Ch running ?
so you have a 3 position 3 port valve
i think piping it to after the 3 port on the Hw side will be your best option or
have it piped as a bypass radiator and it will be on at all the time and then secondary control will be your thermostatic radiator valve
as mention before by MJ ,
flow from before 3 port valve and return back to return pipe
Daft question, is there a chance he's used a directional TRV and put it on the wrong side of the rad?
or NRV is faced wrong way
You have let the air out have you ?
Sounds like it is definitely piped wrong, lots of possibilities as to what he has done. Best thing is to get him to do it again from scratch, there will be no need for any non return valves when pipes correctly.
It seems simple enough. The plumber has made a stupid mistake, if I am picturing it right.
As you have said, the return to the cylinder is where he went wrong. That shouldn't be joined into for the rad unless you also joined the flow to the hot water flow & at least the rad would work when hot water only on & not effect the other rads.
What is happening at moment when only hot water on, is the flow is going through cylinder coil & then out through the return pipe the plumber has wrongly connected - then through the rad & into the flow he connected to the main rad circuit.
Simple! And it really just is the usual mistake - 2 connections to the main return circuit instead of just one!
that pipe to right of pump, did plumber fit it? the one with white handle on it!!
Think it is below the pump if the picture was right way up. Don't think that should be joined in there, if it is before the 3port. I am confused!
Think it is below the pump if the picture was right way up. Don't think that should be joined in there, if it is before the 3port. I am confused!
No that's always been there.
he only teed into ch flow and HW cylinder return.
Its a lot easier to connect into the hw return though as that's the only returns in loft, saves breaking walls etc. non return should of solved this though!! The issue is the bypass, bet it was blocked before and he moved it by cutting and soldering new fitting and caused back flow. Need to shut valve and replace with automatic bypass valve!!Kind of says it all! Joining to CH flow & then cylinder return won't work IMO.
Get a heating engineer to repipe the rad.
Either just use the cylinder circuit, so new rad will only work when hot water on sadly,
Or have the new radiators return pipe joined into the returns of the rad circuit somewhere if this is feasible, but NOT into the main circuit!
Reply to New radiator in loft causing problems in the Plumbing Jobs | The Job-board area at PlumbersForums.net
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