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VAV Parallel Box

VAV Parallel Box

VAV Parallel Box

(OP)
I am wondering why the fan in this box only turns on when the HVAC system is in heating mode?

RE: VAV Parallel Box

Is this a reheat system?

RE: VAV Parallel Box

(OP)
Yes it is.

RE: VAV Parallel Box

A bunch of questions follow from the first:
     Is the control system pneumatic or electric?
     Where are the thermostats?
     How are resets controlled?
     What is the climate of the building?

I could go on and on.....you have not given adequate information even to pose the question.

RE: VAV Parallel Box

Intermittent fan powered boxes are also known as fan powered induction boxes, parallel fan powered boxes, primary bypass fan powered boxes, and powered induction units (PIU). They provide VAV to the conditioned space when cooling and constant volume when heating.

RE: VAV Parallel Box

good one, imok2

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