Distech ECP-VAV??

[qtip]

Can you do DA control with this device using a tri-state (Floating Point) actuator?
From what I see it is either on/off control of modulating 0-10 or 4-20 signal.

Thanks

[ctrlguy]

It's freely programmable and has multiple PID loops, so technically, you can make it do whatever you want. I have an old EC-VAV mounted on a 3-way valve doing loop control on a radiant floor heating system (in my house).
Writing a program that works for floating control is pretty tricky if you don't have feedback. The sample that Distech provides is not very good. I have one that works ok, but still requires regular synchronizing.