EWC Controls Forum

I have 3 ND dampers in my system. One for each floor. They come ot out the plenum as 1st floor (16x10), 2nd (16x10) and 3rd (12x12) on prgressing sides. When the first floor calls for heat (which isn't a lot due to a wood stove) everything runs with minimal noise. When the 2nd floor calls it starts ...