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One pipe system air locks

View the thread, titled "One pipe system air locks" which is posted in Air Sourced Heat Pumps Advice Forum on UK Plumbers Forums.

TFGplumbing

Plumbers Arms member
Plumber
Gas Engineer
I took this job on to replace TRV's & lock shields on a one pipe system, its donkeys years old, I thought it would be an arsehole job and it has not disappointed me, customer told me all the other plumbers never got back to her haha

Its got some air locks in it and they are proving a ***t to get out. 5 out of 8 rads are getting hot. Anyone got any Ideas for shifting air locks on a one-pipe system, i've tried all the usual stuff to no avail.

Cheers
 
Pulling the stat is easy enough. It just rattles bangs and clicks a bit but down in Englandshire you guys use 3/4" overflows so the f&e could run over if you let it boil for more than a few seconds.
We use 1 1/4 and 1/ 1/2"
 
Not all trv's are alike. Some have higher resistance than others.
Did you push the tails down any when you fitted them? If there isn't a rise or very little rise from the main circuit to the rad it won't work.
Try pulling the tails up a bit if there is any play.
One pipe rad valves are expensive at around 50 quid for the valve body and sensor.
As a compromise they will have a better chance of working if you piped them tboe as the pressure differential is proportional to the rise.
 

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