If the radiator is virtually full of air, no divergence in temperature between the top and underside of the radiator will be experienced. However, in these extreme situations, the whole radiator will be cool. This will be a direct contrast with the rest of your central heating system where the other radiators will be hot to feel.
The process for radiator bleeding is comparatively simple and safe. All radiators are supplied with a small-scale tool known as a bleed key. There will also be an extrusion near the top of the radiator, to one side, called the bleed valve. You need to open this valve a small degree to enable the air to leak from the top of the radiator while not enabling the water to flow out.
Whenever you plan to bleed a radiator in a sealed central heating system you should cut down the general pressure of the system (refer to your manual). This should not be a problem if you top up the system later on from the primary cold water feed.
TAKE CARE whilst twisting the valve. Have an old cloth available to protect your hand and a small bowl to catch any small beads of water which outflow. You do not need water dripping on to the carpet.
First switch off the heating or you could import more air into the heating system and radiators. Fit the bleed key into the bleed valve and cautiously twist it anti-clockwise only a small turn, normally just a 1/4 or 1/2 turn. The air will start escaping with a hissing noise similar to a bicycle tire. When water starts to drip out, all the air is purged, and you can gently return the bleed valve to its original position. You should then remember to switch the heating back on and ensure that there are no leakages from the radiator valve.
The process for radiator bleeding is comparatively simple and safe. All radiators are supplied with a small-scale tool known as a bleed key. There will also be an extrusion near the top of the radiator, to one side, called the bleed valve. You need to open this valve a small degree to enable the air to leak from the top of the radiator while not enabling the water to flow out.
Whenever you plan to bleed a radiator in a sealed central heating system you should cut down the general pressure of the system (refer to your manual). This should not be a problem if you top up the system later on from the primary cold water feed.
TAKE CARE whilst twisting the valve. Have an old cloth available to protect your hand and a small bowl to catch any small beads of water which outflow. You do not need water dripping on to the carpet.
First switch off the heating or you could import more air into the heating system and radiators. Fit the bleed key into the bleed valve and cautiously twist it anti-clockwise only a small turn, normally just a 1/4 or 1/2 turn. The air will start escaping with a hissing noise similar to a bicycle tire. When water starts to drip out, all the air is purged, and you can gently return the bleed valve to its original position. You should then remember to switch the heating back on and ensure that there are no leakages from the radiator valve.
