Induction Boxes

[HVAC1989]

I have a retrofit job with some Anemostat High Velocity type HIE inductin boxes. Does anyone know how these units operate. Is there a factory setting for the maximum CFM that needs to be changed if I change the maximum CFM? On several boxes the CFM does not change when we increase the inlet static pressure from 1.25" to 2.0". Thanks.

 

[imok2]

Have you been to their web site?

http://www.anemostat.com/a-catalog/pdfs/qst/qst_qpt_iom.pdf

 

[HVAC1989]

I could not find any information on the HIE induction boxes.

 

[Drazen]

One practical suggestion: if you do retrofitt job I am pretty sure that you will have to do testing & balancing to make job complete.

During testing you can do adjustments on your anemostat to reach proper cfm.

You would have to do the same way even if you find adjustment curves in catalogue; this way you may have to spend a little more time, but after several field adjustments you will already know how to do it fast (you will notice how many times you need to turn adjustment screw and then you can do all rough adjustment before testing not to extend testing time too much).

 

[ChasBean1]

Induction boxes can be tricky. Either yours has a pressure independant control that keeps constant flow, or flow really doesn't change a whole lot above a certain static pressure, or you might not be measuring it right. My experience with induction units is that you can't just put a flow hood on the discharge; you have to put a static pressure sensor within one of the nozzles and bounce the pressure off the unit's curve...

Can you clarify what you've seen (your givens)?