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Looks like a Powerhouse rental trailer.

Good evening all. It appears the culprit is an intermitantly operating barometric bypass damper.Thanks for the comments & suggestions. Hopefully the problem is solved. Will replace the damper next...

It does re-enter close to the return plenum. thanks on the plexiglass tip.

This is an air handler manufactured by "The First Company" that has an evap. coil upstream, or on the suction side of the fan, with a hydronic hot water heating coil on the pressure, or discharge...

We took readings on the A/H return inlet, and the A/H outlet.

No open air returns, but it does have a prior existing Carrier barometric bypass damper off the supply duct. The damper shaft indicator shows closed, but it could be leaking through.

The condensate line is in fact properly trapped. The coil is mounted below the fan and the fan velocity appears to be "sucking" or lifting the condensate off of the coil.

Good evening,
I replaced an existing 4 ton air/air heat pump with a 4 ton straight cool/ hot water hydronic coil air handler.
The new air handler sucks or pulls the condensation off of the...