Still not thinking clearly then.
It will make no difference to the rad, closing the lockshield means it takes longer to get hot
Still not thinking clearly then.
It will make no difference to the rad, closing the lockshield means it takes longer to get hot
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But it will get hot all over the surface area of the radiator and that was one of the questions that was asked.
How would you get the bottom of the rad hot because that has always worked for me when balancing a system, unless their is a problem with the pipework or a build up of sludge in the rad.
How would you get the bottom of the rad hot because that has always worked for me when balancing a system, unless their is a problem with the pipework or a build up of sludge in the rad.
The convection flow within a radiator fed at the bottom is from the flow to the top so the top is always hottest.
With the correct flow the rad has 10-20°C differential across the flow/return. That is set with the lockshield.
I also advocate setting all lockshields open just one turn as a starting point for further balancing. In practice thats often all the balancing required on a small system with correctly sized pipework.
Tony
With the correct flow the rad has 10-20°C differential across the flow/return. That is set with the lockshield.
I also advocate setting all lockshields open just one turn as a starting point for further balancing. In practice thats often all the balancing required on a small system with correctly sized pipework.
Tony
If the rad is not getting hot allover then it;
A, sludged up.
B. not getting enough heat, more flow required not less.
C. Pipes undersized
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A: they are new rads
B Is that not the trv that controls flow? I am talking about the lock shield on the return
C. The great debate goes on about the pipework and until i had seen the installation then I would not know how It has been laid.
D. Were these not stated above
well tony doitall thinks we are both wrong
The lockshield controls the flow, remember the bit about balancing the system
by balancing each radiator you are controlling the flow to each one, and spreading the heat, if one is colder than the rest you open the L/S valve to give it more flow/heatThe TRV controls the temperature and thats all,
What Tony has posted is correct.
The hot water enters the radiator and goes straight to the top, as more hot water enters the radiator so the heat will gradually work its way down, therefore the more heated water you can get into the radiator the quicker it will displace the cold.[/b]
Which boiler do you have? Is it a Vitodens 300 version WB3B?
he has half hot and half cold on a new rad and all i told him was to close the lockshield or open to get the whole rad bouncing
Balancing the radiator by opening the L/S valve will give a higher flowrate, and the rad should heat quicker.
I have never had the opportunity to saw a radiator in half but, I have taken them off the wall when decorating and flushed them through. From memory, the cross section looks something like this:
Water is not directed through the vertical sections. It's the restriction at the output, provided by the lockshield valve, which stops water flowing straight through the bottom of the rad, without rising up the vertical sections. So, opening the L/S valve will certainly give a higher flow rate but the effect will be that the radiator will not get so hot.
Some have suggested that it does not matter if the L/S valve is on the flow or the return. I don't think this is right. The purpose of the L/S valve is to prevent the water leaving the radiator too quickly, not preventing it entering too quickly.
Interesting theory DH complete nonsense but interesting.
If hot water enters the radiator it will rise to the top and displace the cold.
And no it doesn't matter if the L/S is on the flow or the return, it is there to balance the system, and for isolation purposes.
The only time it makes a difference is on a single pipe system whereas you need to check the return, and a gravity system for the same reason.
complete nonsense but interesting.If hot water enters the radiator it will rise to the top and displace the cold.
And no it doesn't matter if the L/S is on the flow or the return, it is there to balance the system, and for isolation purposes.
The only time it makes a difference is on a single pipe system whereas you need to check the return, and a gravity system for the same reason.
Interesting theory DH
And no it doesn't matter if the L/S is on the flow or the return, it is there to balance the system, and for isolation purposes.
And you say i talk crap. It is a lot easier to balance the rad if the trv is on the flow and the L/S is on the return. What I say is correct and i stand by that so get your geriatric mates to try to tell me I am wrong.
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