Hi ive just installed x4 new radiators for an extension and teed into the existing return and flow. I think ive got severve air in the system. x1 is hot and bleeds fine, x2 are hot but i can remove the bleed nipple and no water comes out and the another is cold, water bleeds out(cold) but the pipes are getting hot towards it. Ive tried bleeding at the pump as well. When i remove the screw water just drips out. Should it come out with force? can i leave the screw out as i can hear air coming out now and again untill water really starts coming out? The boiler is a back boiler not a combi and all the existing radiatorts worked fine before, thanks for any help cheers Rick
air lock? how do i get rid after installing new radiators
- Thread starter yellowbelly
- Start date
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Turn off all rads that are getting hot, open rad valves fully until air has been removed and then balance heating system
when you try to bleed the highest radiator in the house, does anything come out?
when you try to bleed the lowest radiator in the house, does anything come out?
How deep is the water in the F&E tank, and how much mud is in it?
Turn off the pump while bleeding.
when you try to bleed the lowest radiator in the house, does anything come out?
How deep is the water in the F&E tank, and how much mud is in it?
Turn off the pump while bleeding.
turn off pump is this correct?
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Yes, or you could pull air in.
Andy
Andy
ive just noticed the pipe that comes outside, through the fascia board from the tank/cylinder upstairs has water flowing out??? is this overflow??
I suspect you have a partial blockage. That would explain both the pumping over you describe, and the poor filling. You also have an open-vented back boiler, which suggests an old and dirty system.
Please answer the outstanding questions.
If you can photograph, or describe, the layout of pipes going up to the loft, and where they are in relation to the pump (there will/should be a large and a small pipe - that will also help.
If, when the F&E is overflowing, you go and have a look at it, you will probably find the tank is full to the top, and water is gushing out of the large pipe that is bent in a loop over the F&E tank.
Did you do a chemical clean before fitting the new rads? Pumping over will have aerated the water and started fast corrosion, so it is going to need cleaning out before you refill with fresh water and a chemical corrosion inhibitor.
Please answer the outstanding questions.
If you can photograph, or describe, the layout of pipes going up to the loft, and where they are in relation to the pump (there will/should be a large and a small pipe - that will also help.
If, when the F&E is overflowing, you go and have a look at it, you will probably find the tank is full to the top, and water is gushing out of the large pipe that is bent in a loop over the F&E tank.
Did you do a chemical clean before fitting the new rads? Pumping over will have aerated the water and started fast corrosion, so it is going to need cleaning out before you refill with fresh water and a chemical corrosion inhibitor.
i asked a plumber friend about my radiators and being unable to bleed them and he said check the small tank upstairs has not run empty. I had a look and it my have been a little lower than it should have been so i pushed the balldown and filled it up. If i overfilled it will it come out of this pipe i described in the last post?
possibly a little. Unlikely to be more than a pint or so.
Have you answered the questions yet, such as how deep the water is in the F&E, the chemical clean, the pipe layout, amd the bleeding pattern?
If not, what do you think are the chances anyone can diagnose your problem?
Have you answered the questions yet, such as how deep the water is in the F&E, the chemical clean, the pipe layout, amd the bleeding pattern?
If not, what do you think are the chances anyone can diagnose your problem?
what type of the boiler have you go
sorry ill have another look tomorrow, think ill start with turning the pump off. Do you mean turn the electric supply off? isnt it best to bled with the heating on? ive turned the radiators off that are working and bleeding fine and ill check the tank levels
bump
right open vent have you got a three port or two port vavle and are you quick with spanner`s if so
open a nut on the vavle afer the pump and then lock back again before you flood the house
open a nut on the vavle afer the pump and then lock back again before you flood the house
If you were as quick answering questions as you are at asking them, it'd be sorted by now.
You've already been told to turn the pump off.
Come back when you've got the answers, or not at all. Your choice.
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