Hi, used this forum last year when we brought the radiant floors online...what a life saver! We enjoyed the benefits of radiant last winter and decided we should add panel radiators to our basement. This means that I will now have a primary/secondary setup w/ the main floor as zone one and the basement as zone two, separate pump for each zone. It took a long time to work the air out last year there must be a better way. I won't be opening the pex manifolds but will be reworking the lines which feed them (copper). Additionally I still have concerns that there is air in the pex after all this time but I can't be sure.

What is the proper way? >>I have a PRV on the autofill which I turned up to street pressure and then flushed water through each zone individually, the drain was a garden hose into a bucket full of water which overflowed into the laundry basin. This seemed to work, the system is quiet (except if it sits for a long time in which case I can here the pump gurgle for the first minute) and heats but was I adding more air w/ the constant flow of fresh water during flushing?
The highest flow rate I have seen is maybe 0.3gpm per loop (during operation much higher when flushing) and I don't think that is quick enough to move the entrapped air. It was suggested that my pump (Taco 008 w/ 7 x 250' loops) should push more flow than that per loop and this is my concern for the air.

But how can I then move the system water fast enough to carry the air out and purge properly if the Taco 008 can not handle it because of possibly air? I assume once the air is out the pump should suffice. Thanks for any input, I hope you can follow my rambling.

Matt.

a good air separator makes this point pretty much moot.

The separator I have came w/ the plumbing package (fill/drain, separator, expansion tank pressure gauge and check valve). Not sure if I can mention who sold me the kit here?
I couldn't find a model but it says Honeywell, is quite tall w/ the expansion tank threaded to the bottom and a bleed off thumbscrew (which I leave loose) at the top. Does that sound right...maybe I have to clean part of it? Should there be a directional arrow that might be messing me up? I will try to add a picture. Sorry I have tried to find my answers but still confused.

Thanks,
Matt.

be best if you didn't, but that is a good air separator. it should prevent any air bubbles from being major problems as long as they don't stop flow entirely and you have makeup water available.