New Radiators Not Working (pic incl)

[kenny1601]

Hi there.

Today I was over at my folks house as they have been having issue with new radiator that were fitted in there extension. When the heating is on, all the radiators in the house are roasting bar the two in the extension which are luke warm at best (inlet pipe to both radiators are roasting). The plumber has been back in numerous occasions but with no joy. I will try an explain what I have done as simple as I can so far.

Firstly I closed both valves on either side of the radiators and removed them and attached a hose on one end and cleared them both out. Refitted them and pressurised/bled and started the heating........no joy...still cold!
P.S. before I refitted I cracked open both inlet valves to radiators and got a good bit of pressure out them so happy that water is getting to them OK and as I said above, the I/l pipes are roasting when heating is on!

Next I shut the O/L valve I have labelled in my pic and both o/l valves on both radiators and split the pipe the O/L valve and a small dribble of water came out. when I cracked open the O/L from the main system.....lots of pressure as expected. I then split the coupling on both o/l valves of radiators and blew through the return pipes and both were clear.
Refitted everything and still no joy!

When the heating is on, the return pipe from the rad in the dining room is toasting but the return pipe from the extension is cold all the way to where it T,s into the main system.

So my next thought is the pressure coming back from extension is too low to over come the pressure on the main system and ends up lying in the return pipe?

So to over come this I thought removing one of the rad in the extension, so off to homebase and bought two 90 degrees bends, removed to two t-pieces I labelled 1 and 2 and fitted the bend.
Re pressurised, bled etc and nothing again!

Why is the pressure dropping so much over the rad's in the extension?
Would I be right in saying that the pressure appears to be too low on the return lines that it wont get back into the main ring at the t-piece.

p.s. even when I turn off both valves on dining room rad the return pipe from the extension all the way to 2nd t-piece is cold (2nd t-piece after the O/L valve.

Sorry this is long winded. But want to get as much info as I can.

 

[twgas]

Next I shut the O/L valve I have labelled in my pic and both o/l valves on both radiators and split the pipe the O/L valve and a small dribble of water came out

This points to a restriction in the new return

 

[Agile]

TW, what is an O/L valve?

Op, what balancing has been done on the whole house since fitting the new rads?

 

[twgas]

I'm assuming op means OutLet or as most people call it return.
Tony, if you need further explaination on flow and return let me know

 

[kenny1601]

O/L is the outlet valve. It's the isolating valve on the return line from the two rads in the extension. It's placed just before it T's back into the main circuit.

None really, my **** off all the rads bar one yesterday to see if the rad in the extension heated up, it did but I was still able to touch it. Does it sound like I need to balance it properly? Until now I have never heard of doing this. I have drained a few systems before and refilled them without any hassle, I assume its only when you introduce new rads to the system??

 

[gigz]

Close all the other rads in the house and see if these two in the conservatory get hot, if they do it probably needs balancing, if they don't its either a blockage or piped up wrong. The arrow on the far right ? Where does this go ? I'm assuming it follows through with the 22mm pipe, if so this will starve the rads as its an easy path for the water to go. (Only assuming)

 

[kenny1601]

Yeah that is 22mm and T's off to 15mm which feeds the dining room radiator. It also T's off to feed the extension rads.

The rads do get the hot water to them as the inlet pipe to the rads is too hot to touch but the rad is only Luke warm?

I think you are right though, the system req to be balanced. I am going over tomorrow to try this and will update.

Fingers crossed!!