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[Uponthehill]

How about this...

https://www.flickr.com/photos/129681561@N06/

[Uponthehill]

Thanks guys. I'm going to plumb it as shown. Stay warm...

[Uponthehill]

All is working great. Thanks for all your help. I installed a pressure gauge just past my pump. What would be considered a common pressure?  I know all installs are different, but would just like to see what others out there have on their system. Temporary floor fan coil blowing ~ 150 degree air. 18 degree delta back to boiler. This is an open loop...

[Uponthehill]

Does anyone else have a pressure gauge ?  Pressure readings ?  Just curious...

[LittleJohn]

If you are looking for a common CLOSED LOOP pressure, I would say 15psi -> very important to measure this with all the circulators turned off and zone valves open.      You can actually watch the gauges drop or rise when the pump turns on or off, it the gauge is installed close enough to the pump.

**15psi is equal to a colomn of water 34.5' tall, so you can maintain some pressure in the entire system (up to 3 stories, add additional 5psi per story)

Some Commercial radiant jobs I have been to, have operating pressure of 35psi or higher, due to larger pumps that cause larger pressure drops; you do not want the pressure so low that the suction side of a circulating pump that it becomes a vacuum (and creates air bubbles to cavitate).

[Uponthehill]

It's actually a open loop. My delta T is where it should be @ ~18 degrees. I was just curious for other comments. I am showing 14 psi just after the pump.  Thanks for answering. Stay warm...