My central heating system is just over 30 years old and was installed when the house was built. From day one we have always had air building up in one of the radiators on the hot water cylinder convection part of the boiler system, there are two radiators on this circuit but always the same one collected air. The builders plumber returned a number of times but only checked that the air was not a flammable gas and put inhibitor into the CH header tank, and then refused to answer any further calls. So we have just lived with the fact that I had to bleed the radiator every month or so.
The system has been drained down a number of times over the years to repair leaks, change radiators and move the boiler to a new position.
Recently we changed the radiator that collected air from one which was 1800mm wide x 600mm high to a modern upright model which is 600mm wide and 1600mm high, and since then no air has collected in the new or the other radiator on the circuit.
What happens now is that water is being fed into the CH header tank, through the overflow pipe, which then overflows. I think this is because the top of the new radiator is higher than the top of the hot water cylinder and so the old problem of air in the system is still with me but is now in the feed to the cylinder coil. The cylinder was replaced about 5/8 years ago after advice from DIYnot.
Is there some automatic way of removing the air?
There is no problem with the ball valve and the overflow pipe is not below the water level in the tank.
Read more: //www.diynot.com/diy/threads/ch-header-tank-overflowing.447216/#ixzz3tpbu2r6O
The system has been drained down a number of times over the years to repair leaks, change radiators and move the boiler to a new position.
Recently we changed the radiator that collected air from one which was 1800mm wide x 600mm high to a modern upright model which is 600mm wide and 1600mm high, and since then no air has collected in the new or the other radiator on the circuit.
What happens now is that water is being fed into the CH header tank, through the overflow pipe, which then overflows. I think this is because the top of the new radiator is higher than the top of the hot water cylinder and so the old problem of air in the system is still with me but is now in the feed to the cylinder coil. The cylinder was replaced about 5/8 years ago after advice from DIYnot.
Is there some automatic way of removing the air?
There is no problem with the ball valve and the overflow pipe is not below the water level in the tank.
Read more: //www.diynot.com/diy/threads/ch-header-tank-overflowing.447216/#ixzz3tpbu2r6O
