Rad slow to heat up fully

[ZakUK]

I meant air can be blocked somewhere in the system and it may need more than a quick bleed to shift it along. Air will get to the highest point but it isn't always instantly. Bleeding for more than a quick 'yep, there's water there' will often help with getting any trapped air moving along, past sludge and debris.

Will try that. Thx

 

[ZakUK]

Close the flow valve and bleed again, releasing a couple of litres of water. You may find an airlock on the return and bleeding with both valves open will not releive this.

Which one is it ? Where TRV installed ?

 

[Madrab]

Its been like that since the installation 2 weeks ago.

Well, it really should be for the installer to be coming back and setting it up properly. I don't see why installers can't install something, with a rad, bring it up to temp, get the client to check it and then get's the dosh, it's basic customer service and IMO a professional job. They shouldn't have left until the system was up to temp and that rad was nice and toastie.

The other radiator is across the room on the other side (in other room) and it heats up quickly and very well

ok, so the supply pipe goes into that wall and down then under the floor over to the other side of that room, under the wall and then over the width of the extension to the other wall and then up to feed the column?

Throttle the radiator ? You mean closing lockshield a bit ?

Firstly, If you switch off the white rad say at the TRV/Wheelhead, not the lochshield yet, does the column rad then warm up properly?

 

[ZakUK]

Well, it really should be for the installer to be coming back and setting it up properly. I don't see why installers can't install something, with a rad, bring it up to temp, get the client to check it and then get's the dosh, it's basic customer service and IMO a professional job. They shouldn't have left until the system was up to temp and that rad was nice and toastie.

ok, so the supply pipe goes into that wall and down then under the floor over to the other side of that room, under the wall and then over the width of the extension to the other wall and then up to feed the column?

Firstly, If you switch off the white rad say at the TRV/Wheelhead, not the lochshield yet, does the column rad then warm up properly?

Basically rad is on the extension wall, pipes go under floor to the wall opposite, another rad is on that wall on the other side, pipes go through the wall and connected to the CH at the point where other radiator's lockshield is.
Will try to turn TRV to zero later on and see what happens. What possible outcomes will i be looking at ?

 

[Madrab]

This will be the least invasive and easiest way to DIY the fault find.

Turning off the rad that is on the same supply pipe will show whether all it'll need is both of them setup properly and that will probably be by adjusting the lockshield on the white rad. If it's still as bad then you'll want to repeat the test with the other rads off. If it then heats up properly then it'll need some further adjustments on the other rads.

If it doesn't then there's an issue with the rad itself or the supply pipework and that'll need further investigation.

 

[ZakUK]

For the start: Shall i turn lockshield or TRV off on the rad to which column rad is connected ? And leave all valves open on the column one ?

 

[Madrab]

Leave all the lockshields as they are, we can perform the same tests using the TRV's. Do the TRV's have a '0' on the gauge or a * as the lowest setting? Shouldn't matter really though, just wondering.

 

[ZakUK]

Leave all the lockshields as they are, we can perform the same tests using the TRV's. Do the TRV's have a '0' on the gauge or a * as the lowest setting? Shouldn't matter really though, just wondering.

They have "*".
So im leaving extension one at "5" and the one it is connected to at "*".

 

[Madrab]

Yup

 

[ZakUK]

Yup

Well, the one inside the house with "*" is all cold, extension one has same issue.
Also, pipe next to trv is hot, pipe next to lockshield is maybe half the temp on the extension rad

 

[Madrab]

So the white standard rad that is in the pic, that has the pipes tee'ing off and going through the wall that goes to the column rad in the extension, has it's TRV turned off and it's cold now but the column rad isn't any better, basically the same as it was?

Are the other rads in house hot? If so then work your way around and start to turn off each rad, at it's TRV, starting with the closest to the column, after each one wait a few mins and see if the column starts to heat up. Is the lockshield and TRV on the column open fully?

 

[ZakUK]

So the white standard rad that is in the pic, that has the pipes tee'ing off and going through the wall that goes to the column rad in the extension, has it's TRV turned off and it's cold now but the column rad isn't any better, basically the same as it was?

Are the other rads in house hot? If so then work your way around and start to turn off each rad, at it's TRV, starting with the closest to the column, after each one wait a few mins and see if the column starts to heat up. Is the lockshield and TRV on the column open fully?

First statement is correct.
All rads everywhere where hot.
All valves are open everywhere, but not sure about the column one as its lockshield looks like one in the pic and dont know how to turn it The guy who installed it says it is ON, although id like to see it myself

 

[Madrab]

It's an allan key that you'd use to turn the centre grub screw.

If that is the actual valve then it certainly looks fully open (up). Now it's time to turn another rad off and wait a little and see if it gets warmer and keep doing that till hopefully it does. The column will take a little time to react so that's why to wait some time till another one is turned off.

 

[ZakUK]

It's an allan key that you'd use to turn the centre grub screw.

If that is the actual valve then it certainly looks fully open (up). Now it's time to turn another rad off and wait a little and see if it gets warmer and keep doing that till hopefully it does. The column will take a little time to react so that's why to wait some time till another one is turned off.

On it ! Second rad off.
Yes it is the actual lockshield on the column rad.

 

[ZakUK]

3rd rad off, after some time, the column rad: out 10 columns, 8 fully hot, 2 has 25% still warm. Dunno if switching off helped or the lenght of heating on, but defo feels like it is getting there slooooowly.
Switched heating off now, way too hot in the house. Will try switching all rads off and see if it helps tomorrow. Good/bad idea ?