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Reversed flow and return to radiator
On 15/03/2012 01:34, Lieutenant Scott wrote:
Someone was telling me that it's important to connect the flow and return to the right ends of a radiator. But I cannot see a problem in water running the wrong way. "The wrong way" would mean water flowing into the radiator through the balance valve and out through the thermostatic valve, but the radiator is symmetrical, and the valves are not one way (are they?), so what would be the problem? Some TRVs are one way. Some are described as two but work better on the flow side, and some are fine either way. The reason this came up is I'm plumbing in a new radiator and I've not marked which pipe is which that I've threaded out of sight under the floor. Although I can actually tell which is which as it's HEP pipe with metre markings on it, I wondered if I really have to know? Make sure the TRV is a two way one, and it should be ok. (Some of them begin to whistle a bit as they throttle the flow when on the return side). -- Cheers, John. /================================================== ===============\ | Internode Ltd - http://www.internode.co.uk | |-----------------------------------------------------------------| | John Rumm - john(at)internode(dot)co(dot)uk | \================================================= ================/ |
Reversed flow and return to radiator
John Rumm spake thus:
On 15/03/2012 01:34, Lieutenant Scott wrote: Someone was telling me that it's important to connect the flow and return to the right ends of a radiator. But I cannot see a problem in water running the wrong way. "The wrong way" would mean water flowing into the radiator through the balance valve and out through the thermostatic valve, but the radiator is symmetrical, and the valves are not one way (are they?), so what would be the problem? Some TRVs are one way. Some are described as two but work better on the flow side, and some are fine either way. Some are either way, but need to be adjusted for the correct direction - this can be done after installation. |
Reversed flow and return to radiator
On Thu, 15 Mar 2012 04:18:20 -0000, John Rumm wrote:
On 15/03/2012 01:34, Lieutenant Scott wrote: Someone was telling me that it's important to connect the flow and return to the right ends of a radiator. But I cannot see a problem in water running the wrong way. "The wrong way" would mean water flowing into the radiator through the balance valve and out through the thermostatic valve, but the radiator is symmetrical, and the valves are not one way (are they?), so what would be the problem? Some TRVs are one way. Some are described as two but work better on the flow side, and some are fine either way. I've seen some which can be positioned with the knob vertically or horizontally, I assume these take it either way. (There's going to be a few naughty replies to the above line.....) The reason this came up is I'm plumbing in a new radiator and I've not marked which pipe is which that I've threaded out of sight under the floor. Although I can actually tell which is which as it's HEP pipe with metre markings on it, I wondered if I really have to know? Make sure the TRV is a two way one, and it should be ok. (Some of them begin to whistle a bit as they throttle the flow when on the return side). I think I'll just connect the pipes correctly, in case of whistling (which would annoy the occupants (African Greys)) or future replacement of the valve by someone (or me being forgetful) who doesn't know the pipes are backwards. I've been told by a plumber he's had to correct a flow/return mix-up which caused a radiator to only get luke warm. The HEP pipe metre markings will tell me which is which, as I bought a 50 metre length of pipe and used the two ends of the length to enter the house, with the middle being in the garage. Therefore the metre markings increase in one direction on one pipe and decrease on the other. -- http://petersparrots.com http://petersphotos.com I was on a Southwest flight once that was delayed at the gate after everyone boarded. The flight attendant said over the intercom, "We're sorry for the delay. The machine that normally rips the handles off your luggage is broken, so we're having to do it by hand. We should be finished and on our way shortly." |
Reversed flow and return to radiator
On Thu, 15 Mar 2012 05:21:29 -0000, Brian Gaff wrote:
Yes a place I use regularly has a radiator like that but its a rushing noise not a whistle. we call it Hissing Sid. I know its childish... Brian Is there a way to stop a radiator going bang bang bang (well quieter than a bang) when it heats up? Only one of them does it and it's the same model of radiator, and has the same model of valves, as the rest. The only difference is it's always the one that needs bleeding - the rest never do. It still makes the noise immediately after bleeding. -- http://petersparrots.com http://petersphotos.com Seen in a health food sto Shoplifters will be beaten over the head with an organic carrot. |
Reversed flow and return to radiator
Well could be the mountings slipping as it expands I suppose.
Brian -- Brian Gaff - Note:- In order to reduce spam, any email without 'Brian Gaff' in the display name may be lost. Blind user, so no pictures please! "Lieutenant Scott" wrote in message news:op.wa7g3e0dytk5n5@i7-940... On Thu, 15 Mar 2012 05:21:29 -0000, Brian Gaff wrote: Yes a place I use regularly has a radiator like that but its a rushing noise not a whistle. we call it Hissing Sid. I know its childish... Brian Is there a way to stop a radiator going bang bang bang (well quieter than a bang) when it heats up? Only one of them does it and it's the same model of radiator, and has the same model of valves, as the rest. The only difference is it's always the one that needs bleeding - the rest never do. It still makes the noise immediately after bleeding. -- http://petersparrots.com http://petersphotos.com Seen in a health food sto Shoplifters will be beaten over the head with an organic carrot. |
Reversed flow and return to radiator
On 15/03/2012 09:39, Lieutenant Scott wrote:
Is there a way to stop a radiator going bang bang bang (well quieter than a bang) when it heats up? Probably due to movement against its mounts as it heats up and expands. The mounts should normally have little u-shaped bits of plastic fitted to support the radiator, to prevent metal-metal contact and enable the rad to slide freely and noiselessly as it expands. David |
Reversed flow and return to radiator
On 15/03/2012 09:37, Lieutenant Scott wrote:
On Thu, 15 Mar 2012 04:18:20 -0000, John Rumm wrote: On 15/03/2012 01:34, Lieutenant Scott wrote: Someone was telling me that it's important to connect the flow and return to the right ends of a radiator. But I cannot see a problem in water running the wrong way. "The wrong way" would mean water flowing into the radiator through the balance valve and out through the thermostatic valve, but the radiator is symmetrical, and the valves are not one way (are they?), so what would be the problem? Some TRVs are one way. Some are described as two but work better on the flow side, and some are fine either way. I've seen some which can be positioned with the knob vertically or horizontally, I assume these take it either way. Sounds like it... (There's going to be a few naughty replies to the above line.....) The reason this came up is I'm plumbing in a new radiator and I've not marked which pipe is which that I've threaded out of sight under the floor. Although I can actually tell which is which as it's HEP pipe with metre markings on it, I wondered if I really have to know? Make sure the TRV is a two way one, and it should be ok. (Some of them begin to whistle a bit as they throttle the flow when on the return side). I think I'll just connect the pipes correctly, in case of whistling (which would annoy the occupants (African Greys)) or future replacement of the valve by someone (or me being forgetful) who doesn't know the In similar circumstances (long run of pipes under a floor) I ended up getting a rad flowing the wrong way once. I was not particularly bother about the direction since I was using reversible valves. However I found that one became noisy as the valve did its thing, so ended up swapping it round in the end since it was in a bedroom. pipes are backwards. I've been told by a plumber he's had to correct a flow/return mix-up which caused a radiator to only get luke warm. That would suggest a non reversible valve used backwards. The HEP pipe metre markings will tell me which is which, as I bought a 50 metre length of pipe and used the two ends of the length to enter the house, with the middle being in the garage. Therefore the metre markings increase in one direction on one pipe and decrease on the other. -- Cheers, John. /================================================== ===============\ | Internode Ltd - http://www.internode.co.uk | |-----------------------------------------------------------------| | John Rumm - john(at)internode(dot)co(dot)uk | \================================================= ================/ |
Reversed flow and return to radiator
On Thu, 15 Mar 2012 14:50:44 -0000, Lobster wrote:
On 15/03/2012 09:39, Lieutenant Scott wrote: Is there a way to stop a radiator going bang bang bang (well quieter than a bang) when it heats up? Probably due to movement against its mounts as it heats up and expands. The mounts should normally have little u-shaped bits of plastic fitted to support the radiator, to prevent metal-metal contact and enable the rad to slide freely and noiselessly as it expands. The new radiator which came with brackets had no such plastic, and I don't think any of the existing ones do either. I think I'll just put up with it instead of trying to lift it off to insert the plastics and damaging the 8mm pipes. It only makes about 10-15 clonks about 1 a second. -- http://petersparrots.com http://petersphotos.com Keyboard error - press any key to continue... |
Reversed flow and return to radiator
On Thu, 15 Mar 2012 19:20:12 -0000, Lieutenant Scott wrote:
The new radiator which came with brackets had no such plastic, and I don't think any of the existing ones do either. Can't say I've ever seen any plastci bits on the brackets or hoops on the back of radiators either. It only makes about 10-15 clonks about 1 a second. Try giving it a woggle so where it bears on the brackets is changed. Or if you can get at the bearing points with a long thin stick put a tiny drop of engine oil on them. -- Cheers Dave. |
Reversed flow and return to radiator
On Thu, 15 Mar 2012 22:12:18 -0000, Dave Liquorice wrote:
On Thu, 15 Mar 2012 19:20:12 -0000, Lieutenant Scott wrote: The new radiator which came with brackets had no such plastic, and I don't think any of the existing ones do either. Can't say I've ever seen any plastci bits on the brackets or hoops on the back of radiators either. It only makes about 10-15 clonks about 1 a second. Try giving it a woggle so where it bears on the brackets is changed. Or if you can get at the bearing points with a long thin stick put a tiny drop of engine oil on them. I have er... woggled it (I think you meant wiggled, I don't have a boy scout to hand) - if that doesn't work I think I can get oil onto them, the brackets are only about 5 inches from the edges as it's a small radiator. -- http://petersparrots.com http://petersphotos.com You can't please everyone. But it IS possible to **** 'em ALL off at the same time. |
Reversed flow and return to radiator
In article o.uk, Dave Liquorice wrote:
On Thu, 15 Mar 2012 19:20:12 -0000, Lieutenant Scott wrote: The new radiator which came with brackets had no such plastic, and I don't think any of the existing ones do either. Can't say I've ever seen any plastci bits on the brackets or hoops on the back of radiators either. Mine came with little plastic clip on bits for the bracket. |
Reversed flow and return to radiator
On Fri, 16 Mar 2012 09:39:03 -0000, Alan Braggins wrote:
In article o.uk, Dave Liquorice wrote: On Thu, 15 Mar 2012 19:20:12 -0000, Lieutenant Scott wrote: The new radiator which came with brackets had no such plastic, and I don't think any of the existing ones do either. Can't say I've ever seen any plastci bits on the brackets or hoops on the back of radiators either. Mine came with little plastic clip on bits for the bracket. I'm not convinced those would last long with the weight of the radiator and the sharpness of the metal brackets. -- http://petersparrots.com http://petersphotos.com A mistake is evidence that someone has tried to do something. |
Reversed flow and return to radiator
In article op.wa9yhw1tytk5n5@i7-940,
"Lieutenant Scott" writes: On Fri, 16 Mar 2012 09:39:03 -0000, Alan Braggins wrote: In article o.uk, Dave Liquorice wrote: On Thu, 15 Mar 2012 19:20:12 -0000, Lieutenant Scott wrote: The new radiator which came with brackets had no such plastic, and I don't think any of the existing ones do either. Can't say I've ever seen any plastci bits on the brackets or hoops on the back of radiators either. Mine came with little plastic clip on bits for the bracket. I'm not convinced those would last long with the weight of the radiator and the sharpness of the metal brackets. Sometimes the radiator does cut through them - has happened to one of mine, but the other 8 or so have lasted 10 years so far (or at least, don't make expansion/contraction noises), and 4 of them are heavy triple panel radiators. (The ones that's failed is a double.) -- Andrew Gabriel [email address is not usable -- followup in the newsgroup] |
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