I have the same proplem but my chillers plant consists of 6 air cooled chillers and 4 pumps. I can inspect the system up to pumps and the total flow is correct but the flow thru pumps is zero and also thru the pump header and all pump fittings all the flow is zero. In addition to that, the flow thru chillers is zero also, only the flow thru the main pipe of fan coil units is correct.
Please any help in this matter
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