HVAC – How to make a bypass function with dampers

[Stig Birkemose]

I’m trying to make at bypass function over the Heat Recovery (HR). To make the bypass function I use the dampers to control the bypass. The dampers I have tried to control with a “function” as profile; like “gt(to,18,1) | lt(to,18,0)” and opposite for the other damper. But it seems that it’s not working. Is this the right approach for controlling the dampers or should it be done in another way?

Yes arrows are pointing in the right direction, for the dampers

[huntervu28]

I'm lazy in using profile, so I use a sensor to detect "to", then switch on/off via independent controller or dependent controller with "AND"