Distech RTU-L with Bypass Damper
Has anybody used a Distech RTU-L Controller with a bypass damper and VAV boxes?
Everything is working OK except the bypass damper. With a static setpoint of 1" and static pressure of 1.7", I could not get the bypass damper to move (was stuck at 0%).
After playing with the duct pressure PID loop settings, I was able to get the bypass position to 50%, but then it would stay there even after large changes in static pressure and/or setpoint.
I am not fimiliar with Distech PID loop settings. All of their literature shows examples for space temp, nothing for pressure.
Any help would be appriciated.
I've done it lots of times and it works fine with the default PID parameters. Recheck your settings.
With a little help from tech support, I figured it out. I had origninally used the "Changeable NV Manager" to change the SNVT type for my duct pressure input to "SNVT_press". Apparently I should have used "SNVT_press_p".
Once corrected, everything worked normally.
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