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Head scratcher, (for me🙂)
Ok guys, youll need to reference the pics below. This has been a trouble system for years apparently.
Issue is no flow thru various zones randomly. Altho zone #4 is fairly consistant with no flow.
The near boiler piping looks wrong to me but i cant place it.
I repiped so the heating pump was pumping into the supply header. (Was on return side) Added spirovent
I verified flow thru each zone using washer hose on sink spigot and power flushing thru the loops ,forward and backward.
The only way i could fedl the end of the #4 loop warm up in normal operation was with the boiler , and its pump off, and the DHW loop off. Then when i closed the return piping valve labeled "this valve" that loop would heat ,along with the others.
Loop number 3, the highest coil would air lock often.
I think there may be a few things wrong here and maybe its simple, but I am confused!
Heating pump can run any time, even when DHW pump is on. It didn't seem to make any difference.
For what its worth, id say the boiler is far to big. Altho it may be sized for DHW. Its a camp and gets heavy use at times. 20 boys and girls showers. Building is only about 2000 sq ft tho.