Bleeding tips

[Conor]

Hi.

 

I've a fiar bit of air circulating through the first floor loops. Ground and basement are perfect. I've opened the bleed valve on the top of the manifold... Took out a good 2l of fluid and some air. But there's still a fair bit of air circulating around.

 

Any tips? Main pump on/off? Manifold pump on/ off? System hot or cold?

[Onoff]

Sorry, thought this was a urology thread.

[PeterW]

How much pressure in the system ..? And does the pump have an air bleed mode as some do - that’s a decent start. 
 

Hindsight being that wonderful thing I spec and fit auto air bleed valves on the top rails normally - keeps them pretty much air free.

[Conor]

53 minutes ago, PeterW said:

How much pressure in the system ..? And does the pump have an air bleed mode as some do - that’s a decent start. 
 

Hindsight being that wonderful thing I spec and fit auto air bleed valves on the top rails normally - keeps them pretty much air free.

1.5bar. nothing on the pumps about air bleeding. There's an automatic air valve on the high point between the ASHP and buffer. That's it tho. I'll see about fitting one upstairs as well. I need to fiddle with some pipework so I'll do it at the same time.

 

I attempted the bleeding when the system was fully running and the circulating pump on min. I'll try it now with everything off and cold.

Edited December 7, 2022 by Conor

[PeterW]

Push an extra 0.5bar in and put the pump to full power and then try 

[Marvin]

Hi @Conor

 

The system may be trying to push water past trapped air down a pipe. Good thing to try with the pump off.

 

Another one I've tried is to open only the one loop fully and run for a while and that forced the air along the pipe.

 

Make a note of where all valve set points are before shutting them off and don't end up testing/setting everything for hours to get it to work properly

Like I did.

[cwr]

I have wilo pumps which have an air purging cycle, tho it wouldn't be obvious from looking at the pump. Details were in the instructions.

 

Do you have drains on the manifolds? Running water through the loops (preferably individually) and out the return drain with the circuit supply open should clear any air. I found that much more effective than using the air bleeds on the manifolds.

[Conor]

4 minutes ago, cwr said:

 

Do you have drains on the manifolds? Running water through the loops (preferably individually) and out the return drain with the circuit supply open should clear any air. I found that much more effective than using the air bleeds on the manifolds.

 

Yes. This is what I actually used to try and bleed it. Rotated the drain round so it was pointing up and opened it slightly, with a basin underneath to capture the liquid.

 

I can't run water again through these as the system is filled with antifreeze, and I don't fancy shelling out for more! I'll try the pump on full and turn all the loops off and try it one at a time.

Edited December 7, 2022 by Conor

[cwr]

I just ran a hose out the front door...

Fair point re the antifreeze. Hopefully just running each loop sorts it for you.