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  1. Thomas C.

    Large Preheat Coil requires recirc pump?

    I came across a job in Texas where the engineer says the preheat coil for a 75%OA and 25%RA VAV AHU must have a recirculation pump installed at a large stacked parallel piped preheat coil and is to run anytime preheat is required, discharge air setpoint is 50 deg F. Usually when I see a recirc...

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