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OP thinks system is air bound. If so wouldn't the head pressure matter until the system is bled properly?
OP thinks system is air bound. If so wouldn't the head pressure matter until the system is bled properly?
Hi Dana,
It has taken a bit to get here, but I have determined that the Navien combi unit reports water pressure and it is 21.4psi for the heating and around 12psi for domestic HW. I need to take pictures of the whole set up as you have asked, but the "turning off the ball valve directly to the right of the blue handled hose tap" the valve you asked me to turn off I believe is broken and stays open all the time. I think I am never actually purging air out of the zone, but I don't know how the system would operate if that valve were always off or always on. I know that the handle is loose moving it from one position to the other and the other valves have resistance. I also was not expecting the system to be set for 21psi, would this valve position cause the system to work harder? According to your calcs, I should be able to run an air handler over 40 feet higher than my boiler and I know that is not my setup.
If you're going to tap into the plumbing at or near the top of the system, just add add system-top air vent there. It doesn't have to be as big as a hose tap, since it only needs to bleed off the air, not flush the system.
You would only need to have another hose tap if trying to purge air at the top of the system with higher pressure and high flow water injected from taps well below the top of the system.
This is awkward, but...
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