Food for thought!, What happens or would happen in "your" h2o circuit if the direction of WATER flow were reversed????that is to say "cold h2o piped to the outlet and return/line piped to the inlet. .I once had a simulare experience on a closed loop system where Heat pumps were used through-out a 3 story complex.....my predecessor had R & R'ed a unit and had inadvertently crossed the inlet and outlet flexable H2O lines comming to the Xchanger of the unit. With compressor running ...The hot gas went into the cold "water bath" making h2o even warmer then the condensed refrigerant passed thru the warm/and some times hot h2o (depending on the season) .just remembering "IN THE BOTTOM and OUT THE TOP" heat Xchangers...I don't recall the exact symptoms my client had, but I remember "it didn't work so good" "low capacity'' ''tripping on hi head" etc.etc!! LOL
''Another One Bites The Dust"
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