Hi,
The rad furthest away from the boiler (400mm ground floor at front of house), always seems to be collecting air so that it needs bleeding weekly as it goes cold, this also means the pressure drops by approx half a bar in 2 weeks so always needs refilling.
The boiler (first floor back of house), is a sealed system combi Worcester Bosch 24i RSF and has been in 3 and a half years.
Things I have done:
Replaced 3 TRV's as wouldn't switch rad off.
Checked every fitting and tightened carefully, no leaks were found anywhere or residue of scale to indicate leaks.
Replaced the heat exchanger as clogged up due to being a hard water area.
Replaced the AAV as old was dripping, opened the screw half to 1 turn as required to let it do its job.
Drained/refilled constantly no sludge in system and its running well and quiet.
Has anyone any ideas of how to spot where the air is gettig in or how the pressure is dropping?
The only other thought I had was the PRV, but put a container under the pipe on a very rare dry day and no sign of water leak, should I eliminate this anyway?
Also is relevant that the rad is the furthest away from the boiler?, could the air collect there for some reason (even though the problem is elsewhere) or does it suggest the problem could be in that area as I thought the pump may push the air round and vent at the AAV.
Any help would be greatly appreciated.
The rad furthest away from the boiler (400mm ground floor at front of house), always seems to be collecting air so that it needs bleeding weekly as it goes cold, this also means the pressure drops by approx half a bar in 2 weeks so always needs refilling.
The boiler (first floor back of house), is a sealed system combi Worcester Bosch 24i RSF and has been in 3 and a half years.
Things I have done:
Replaced 3 TRV's as wouldn't switch rad off.
Checked every fitting and tightened carefully, no leaks were found anywhere or residue of scale to indicate leaks.
Replaced the heat exchanger as clogged up due to being a hard water area.
Replaced the AAV as old was dripping, opened the screw half to 1 turn as required to let it do its job.
Drained/refilled constantly no sludge in system and its running well and quiet.
Has anyone any ideas of how to spot where the air is gettig in or how the pressure is dropping?
The only other thought I had was the PRV, but put a container under the pipe on a very rare dry day and no sign of water leak, should I eliminate this anyway?
Also is relevant that the rad is the furthest away from the boiler?, could the air collect there for some reason (even though the problem is elsewhere) or does it suggest the problem could be in that area as I thought the pump may push the air round and vent at the AAV.
Any help would be greatly appreciated.