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Post by wingnut on Aug 16, 2020 18:52:47 GMT
Hello all
As winter is fast approaching I thought I’d check all my rads were working after this lovely summer we’ve had, and so the problems begin....
All upstairs rads are achieving 20 degree differential between feed and return pipes 60 feed, 40 return which is same as boiler 👍 but downstairs is a whole other problem, the kitchen rad feed pipe is 60 but the return is 25 and rad gets warm not hot, dining room feed pipe warm return pipe cool and rad doesn’t warm up, hallway feed pipe 60 and return 25, rad gets warm but not hot and same for living room, all rads have TRV’s bar the living room as this has the stat.
Now the hallway rad feed pipe only gets hot when I bleed it, rad is very old as well do you think it just needs replaced? None of the TRV’s are sticking either.
Sorry for the long post i
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Post by cylinderfella on Aug 16, 2020 19:01:27 GMT
Probably a good idea to replace then use that opportunity to flush out the others👍
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Post by wingnut on Aug 16, 2020 19:03:59 GMT
Cheers for the reply
It was flushed last March 👍
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Post by cylinderfella on Aug 16, 2020 19:11:42 GMT
Must be balancing issue then
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Post by wingnut on Aug 16, 2020 19:19:51 GMT
Must be balancing issue then Yeah that’s what I was doing when I found the issue |
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Post by tomplum on Aug 16, 2020 19:39:49 GMT
Its very hard to get precise measurements in this weather, the heat is going to go upstairs because heat rises so, this will over heat upstairs because, to balance the rads, you need them ALL fully open,
with that in mind, shut all the upstairs rads and balance the bottom ones, When you get them right, open up the upstairs,
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Post by wingnut on Aug 16, 2020 20:18:28 GMT
Its very hard to get precise measurements in this weather, the heat is going to go upstairs because heat rises so, this will over heat upstairs because, to balance the rads, you need them ALL fully open, with that in mind, shut all the upstairs rads and balance the bottom ones, When you get them right, open up the upstairs, You read my mind that’s exactly what I’ve just been thinking about 👍 |
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Post by wingnut on Aug 16, 2020 20:24:35 GMT
Its very hard to get precise measurements in this weather, the heat is going to go upstairs because heat rises so, this will over heat upstairs because, to balance the rads, you need them ALL fully open, with that in mind, shut all the upstairs rads and balance the bottom ones, When you get them right, open up the upstairs, What’s the best way to balance the rads? This is the guide I’ve been using www.onlyradiators.co.uk/blog/how-to-guides/balancing-radiators-guide |
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Post by tomplum on Aug 16, 2020 20:36:07 GMT
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Post by wingnut on Aug 16, 2020 20:43:34 GMT
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Post by dickpuller on Aug 17, 2020 6:33:03 GMT
Lots of factors in achieving a well balanced system.
Pipe size, pump size etc etc etc!!
Even Locksheild radiator valves differ too, some better than others. Some are just useless!!
Oh by the way, a cool radiator doesn’t always mean a cold room. For condensing boiler it’s cheaper to run with a flow temperature of about 50degree C.
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Post by crowsfoot on Aug 18, 2020 6:13:27 GMT
This method came fron the old SFAS some 30 years ago for balancing a 2 pipe system, it's basic and untechnical, but it works.
With the system cold open fully all the wheel valves whilst closing fully the lockshields on all the radiators.
Switch on the heating whilst opening up all the lockshield valves just 1/4 of a turn.
Give it 15 mins, then feel the temperature of all the radiators - the ones that are still cold open their lockshirlds another 1/4 of a turn.
Give it another 15 mins and then repeat the process until all the rads are an even temperature.
The trick is in the waiting without fiddling with it!
It was a proper typed out letter on SFAS headed paper (which I now wish that I had saved).
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Post by dickpuller on Aug 18, 2020 6:23:23 GMT
This method came fron the old SFAS some 30 years ago for balancing a 2 pipe system, it's basic and untechnical, but it works. With the system cold open fully all the wheel valves whilst closing fully the lockshields on all the radiators. Switch on the heating whilst opening up all the lockshield valves just 1/4 of a turn. Give it 15 mins, then feel the temperature of all the radiators - the ones that are still cold open their lockshirlds another 1/4 of a turn. Give it another 15 mins and then repeat the process until all the rads are an even temperature. The trick is in the waiting without fiddling with it! It was a proper typed out letter on SFAS headed paper (which I now wish that I had saved). There courses were brilliant CF. I’m the same, I wish I’d kept their training material. Longhand Heat Loss Calcs, Pipe sizing etc etc. |
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Post by crowsfoot on Aug 19, 2020 19:24:51 GMT
I had and think I still have a marvelous SFAS book on the design of central heating systems - it's very simply written and packed full of useful practical information and ideas, it cost just £1.00!
I learned so much from it about the old and now defunct systems.
A very interesting page was in it about using injector tees and how they could be an advantage on gravity systems with a low circulation hight - compare that friendly simple advice to all the bullshit we are fed on todays HEATAS reguations about plumbing that just isn't practical and some doesn't even work right....gravity defiying "heat leak" radiators for example!!
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