Replacing radiator without draining down?

[MC78]

Do ‘em one at a time and it’ll hold, as long as no aav open, I do it all the time - no need to drain down.

So if you detach the lockshield off the pipe which is pressurized with water, you will not get wet?

 

[Harvest Fields]

So if you detach the lockshield off the pipe which is pressurized with water, you will not get wet?

Once again. Try it and find out. But I wouldn’t.

 

[MC78]

Once again. Try it and find out. But I wouldn’t.

So I have been disagreed for the right advice

 

[Burger]

So if you detach the lockshield off the pipe which is pressurized with water, you will not get wet?

You relieve the pressure by opening the lockshield after following all other steps I have listed and you wouldn’t get wet. Done it loads of times.

 

[MC78]

You relieve the pressure by opening the lockshield after following all other steps I have listed and you wouldn’t get wet. Done it loads of times.

Would you not need to isolate all other rads to drain only the one as they are all connected? Now I am confused lol

 

[Burger]

Would you not need to isolate all other rads to drain only the one as they are all connected? Now I am confused lol

I have never had to, isolate he flow and return under the boiler, should create a vacuum, plus it’s only for vertical pipes

 

[Ben-gee]

Just open valve and catch the water , shouldn’t be much, then you can cut/ solder whatever you want !
I do this on open vented too just put a 22mm speedfit cap on the vent and a carrot in the feed!
Honestly this is pretty basic stuff i thought we all did.

 

[MC78]

Just open valve and catch the water , shouldn’t be much, then you can cut/ solder whatever you want !
I do this on open vented too just put a 22mm speedfit cap on the vent and a carrot in the feed!
Honestly this is pretty basic stuff i thought we all did.

Well I would rather be safe than sorry, especially on a sealed system.

 

[Burger]

Well I would rather be safe than sorry, especially on a sealed system.

Ok, up to you. Just don’t forget to add some inhibitor after all that water loss and introduction of fresh aerated water.

 

[Ben-gee]

I always use this method if possible, ever since spending hours trying to refill a badly designed system - running round venting and backfilling with mains etc.
In terms of caution, I always have the appropriate sized speedfit cap nearby in case it lets go, and the trusty Charles hoover. Although only needed once, a faulty aav I hadn’t found in back of airing cupboard, this one I drained.

 

[SimonG]

but if you are wanting to change the whole of the lockshield and tvr components then draining the system is advised.

This is the bit I disagreed with. No need at all to drain a pressurised system for a job like this.

 

[king of pipes]

Save yourself alot of grief drain down replace the radiator and fit the new valves . Kop

 

[SimonG]

Would you not need to isolate all other rads to drain only the one as they are all connected? Now I am confused lol

Sums up your lack of knowledge. Unless you know what you are doing then stop making yourself look like a tit by commenting on stuff you obviously know sweet fa about.

 

[Burger]

FYI:

Just changed a 10mm trv today. In and out in approx 20 mins, and that includes cutting old olive off as new nut doesn’t marry up to existing.

 

[Harvest Fields]

FYI:

Just changed a 10mm trv today. In and out in approx 20 mins, and that includes cutting old olive off as new nut doesn’t marry up to existing.

Well done you. Give yourself a giant pat on the back.