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  • Users: dpoppeli
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  1. dpoppeli

    Backflow preventer

    A small constant-temperature room air-conditioner condenser unit will usually be cooled with about 5 gpm chilled water. I am providing domestic-water backup connection which would be higher flow due to higher temp. I know I need backflow preventer. Question is will double check valve be...
  2. dpoppeli

    chiller + boilers in same equip. room

    Anybody know what code issues I might run into by locating a 50 ton chiller in same room as two one-million btuh boilers? Someone seems to think there may be issues and one person has eluded to ASHRAE standard 15. This is in Indiana, USA. I am looking at a split type chiller system so...
  3. dpoppeli

    motor hand-auto selector switche

    Application is central air-handlers in a university building. Apparently some here want to specify that hand-off-auto selector switches be installed for fractional horsepower motors such as freeze-protection pumps (hot water air-handler coils) and electrical closet exhaust fans. My argument is...
  4. dpoppeli

    cooling tower freeze protection

    A 30 year old existing condenser water loop system has a full 6" cooling tower bypass with control valve fairly close to the pump (below roof) as well as a small 1" bypass with steam-heat and auxilary pump closer to the tower end of the lines (still below roof). The installation is in Indiana...

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