Please help me
I have an open system (i.e. with expansion tank in the loft) powered by Ideal Mexico Super CF55 boiler which seems to work fine. I have replaced some of the old radiators and radiator valves, and now after refilling the system I am stuck with the following problem:
1. When I filled the system with water it all seemed fine, I could bleed the radiators both upstairs and downstairs and after some air there was water coming out (from every radiator)
2. When I switched the boiler on it seems to work fine - the water got hot in hot water taps (i.e. in the hot water cylinder upstairs) and in the radiators downstairs. But radiators upstairs stayed cold.
3. So I assumed that there is air in each of them so I tried to bleed them but instead of air (and later water) coming out I've discoverd that each one of them sucks air in! I run downstairs and switched the boiler off (I was afraid to damage it), but left pump on to see what would happen.
4. After a minute or so of sucking air in from one of the bleeding valves upstairs I heard water going through the safety (overfill) pipe of the expansion tank in the loft.
I played around with it a bit, draining the system and refilling it again several times to see if that helps but with no luck. Still when pump is on the radiators upstairs suck air in! Switching the pump off makes the system "normal" - I can bleed radiators upstairs and after a little air water starts coming out. I also discoverd that I don't seem to be able to drain the system completely any longer - radiators downstairs stay full (I open the bleeding valve and water comes out) even after water stop coming out from the draining tap. But radiators upstairs get empty as normal.
Any suggestions on what the problem is and how to solve it will be greatly appreciated.
Andrey
I have an open system (i.e. with expansion tank in the loft) powered by Ideal Mexico Super CF55 boiler which seems to work fine. I have replaced some of the old radiators and radiator valves, and now after refilling the system I am stuck with the following problem:
1. When I filled the system with water it all seemed fine, I could bleed the radiators both upstairs and downstairs and after some air there was water coming out (from every radiator)
2. When I switched the boiler on it seems to work fine - the water got hot in hot water taps (i.e. in the hot water cylinder upstairs) and in the radiators downstairs. But radiators upstairs stayed cold.
3. So I assumed that there is air in each of them so I tried to bleed them but instead of air (and later water) coming out I've discoverd that each one of them sucks air in! I run downstairs and switched the boiler off (I was afraid to damage it), but left pump on to see what would happen.
4. After a minute or so of sucking air in from one of the bleeding valves upstairs I heard water going through the safety (overfill) pipe of the expansion tank in the loft.
I played around with it a bit, draining the system and refilling it again several times to see if that helps but with no luck. Still when pump is on the radiators upstairs suck air in! Switching the pump off makes the system "normal" - I can bleed radiators upstairs and after a little air water starts coming out. I also discoverd that I don't seem to be able to drain the system completely any longer - radiators downstairs stay full (I open the bleeding valve and water comes out) even after water stop coming out from the draining tap. But radiators upstairs get empty as normal.
Any suggestions on what the problem is and how to solve it will be greatly appreciated.
Andrey