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Connect tees on Monoflo

stal
stal Member Posts: 7
in Radiant Heating
I have a monoflo system that heats my first floor.  I've noticed that a set of tees were capped.  I've removed the caps and connected the tees with pipe (i've read that this should be done).  I then filled the system back up and purged the radiators.  But for some reason, the pipe connecting the tees remains cool when the boiler is running, which tells me that water is not flowing in through newly installed pipe.  Do any of you have a solution to this?  Should I have added an air valve on the pipe?  The water pressure is currently set to 17psi.  Should I try increasing the pressure?  Any help would be greatly appreciated.  Thanks.
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