Motorized Volume Damper - Modulating

[NickParker]

Hello All,

Why this motorized volume damper before the Pressurization unit and after the blower fan is of modulating type? Why is it not just open or close type?

 

[dbill74]

Find and read the sequence of operation. You have not given enough information as it is to get a good answer.

 

[Drazen]

what is el-002?

 

[ChasBean1]

Typically I'd like to see those one step simpler for fans in parallel: back draft type. That does not mean this design is flawed. When in doubt of intended sequences the modulating damper has some preferable characteristics over its two-position counterpart. There is more versatility.

 

[willard3]

Fans in parallel, depending upon the blade type, are difficult to control. This could be the reason for modulating dampers.