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sealed heating system air lock problem

View the thread, titled "sealed heating system air lock problem" which is posted in Air Sourced Heat Pumps Advice Forum on UK Plumbers Forums.

Gary80gas

Gas Engineer
Ive now got to run a heating zone through a flat roof structure where the pipes will have to rise 300mm for 8m before dropping to a single rad using plastic pex pipe. Its obviously a sealed system but im worried about airlocks. Has anyone done something similar with no problems. What do you think? Any advice appreciated.
 
Ive now got to run a heating zone through a flat roof structure where the pipes will have to rise 300mm for 8m before dropping to a single rad using plastic pex pipe. Its obviously a sealed system but im worried about airlocks. Has anyone done something similar with no problems. What do you think? Any advice appreciated.

Personally I think you'd be asking for trouble.
Many will disagree I have no doubt. I can only say it is not something I would do.
 
We've done numerous overhead systems, due to bulding being on concrete slab.
In all honesty, very few problems.
Sometimes install manual vents to rid air, but 9 times out of 10 never any issues.
Just inform the customer there may be issues with some rads with airlocks. Just tell them to turn off other rads until they can hear the air gurgle through the rad and then bleed the rad.
 
Thanks OZ, this is what im thinking. I know ive done it like this before but this job is slightly different with only one rad and a long run. Im not putting aav's in a sealed ceiling cos they will leak one day.
It got me thinking about how air is cleared, ive forgotten if I ever really knew.
 

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