Jan 3, 2011 08:27 pm
Re: Purging air from closed loop system
Tom, thanks for the reply. I do have a drain and fill valve on either side of the circulator with ball valves on each. I have tried purging the air at least ten times. I've drained and flushed, blew air through, cranked the pressure up to 55 psi while filling... Each time I've run the fluid through until it appeared that all the air was out. No bubbles in the bucket, not even micro bubbles, just a nice clean green fluid swirling around the bucket. I didn't put the vents on the collectors until I had failed a few times. Then I did hoping that it would help. I tee'd off the top of the collectors with a ball valve, then the vent. I tried bleeding through the top just using the ball valves, until fluid poured out but still, no luck. I installed ball valves at the input and output of each collector for isolation, filled one at a time then opened the loop but still no luck.
I've installed a few systems, flush mounted, coupling the collectors together and never had this problem.
I swithed to the series configuration , basically to see if I could get the system to work at all. They are heating up within a few degrees of each other now as well as heating the water in the tank.
What are the reasons for not just leaving it in series as opposed to paralell?
Your input is greatly appreciated, Thanks