underperforming geo system

air in loop

OK - so I'm hearing no air is good. Could a small amount of air be causing the symptoms I have listed? Could that small amount of air be preventing the antifreeze solution (ethanol/H2O) from circulating through all 3 of my 300 ft vertical loops (in parallel)?

Mark - Don't I need 2 flow centers (pumps) - one for each of my 3T units?

thanks,
Kevin

 

It is certainly possible that there is air blocking a loop. A high powered purge cart will be needed to push it out.

 

It is also possible that the grout is lacking.