Air lock in hot water

[longcg]

I have recently replaced the hot water cylinder in a standard indirect open vented system.

Since replacing it, I keep having trouble with air locks. I can clear them by using the cold water connection method, but they keep recurring eveery few days. There were no problems before I changed the tank. What could I have done wrong? No major changes made to pipework.

Air must be getting in somwhere, but there are no apperent leaks. Any help appreciated.

Thanks

Chris

 

[SafeGasInstall]

hi chris , welome to the forum

 

[SafeGasInstall]

when you rectify the air lock what method did you use ?

 

[longcg]

I link the cold feed from the washing machine to the hot and laeve on for around 30 seconds or more.

 

[PlumbBobBob]

welcome along. is the airlock happening on all taps or just one in particular?

 

[longcg]

It's on all taps

 

[SimonJohns]

Have you checked all gate valves. Or other valves are fully open?

 

[SafeGasInstall]

to me it sound that is not fully cleared or there is debris and gate valves is collapsed could be all together

 

[longcg]

Thank you, I am right that if the gate valve that feed the cold water into the cylinder were faulty, air could be being drawn in through the xpansion pipe?

Thanks again for yout help.

 

[PlumbBobBob]

no that wouldn't happen. if it could, turning off the gate valve to isolate hot water wouldn't work.

 

[longcg]

Thanks, sorry if I am being stupid, But I still don't see how air is getting in then?
Should the hot water take off pipe at the top of the cylinder slope away from or towards the cylinder. I have heard that this can be a cause?

Thank you

 

[PlumbBobBob]

i'm sure it can slope up slightly so any air in the tank can escape up the vent not good to have downwards slope as air will collect at top of tank. can you post some pics of what you can get at.

 

[longcg]

Thanks I will do.