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Return air VFD fan control with return air static pressure

Return air VFD fan control with return air static pressure

Return air VFD fan control with return air static pressure

(OP)
Have a question on how to apply this correctly.
The return fan speed with be controlled with a static pressure transducer in the return duct.

my question is where to put the pressure xducer and is it suction that i need to measure.

This is what I'm using for supply duct pressure after the supply fan
http://www.mamacsys.com/PR-276features.htm
Not sure if this will work for return.

RE: Return air VFD fan control with return air static pressure

What is the goal?

RE: Return air VFD fan control with return air static pressure

(OP)
ok nevermind. I read the control sequence wrong.
not sure what its goal is.  

RE: Return air VFD fan control with return air static pressure

The goal is typically a high limit on suction side (say above 2") to disable the fans before you get a sucked in duct.

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