I have an office building with 2 TED600 RTU's and VCEF
vav boxes. It's controlled by a Tracer system. Everything is about 3 years old. The question I have is I don't know how the system knows it is okay to use economizer. I believe it is determined by the RTU. The RTU has differential enthalpy. I'm trying to find out if it uses an offset of so many btu/lb. I would like to increase the offset so if the outside air enthalpy is only slightly lower than the return air enthalpy it is not okay to economize. The problem is the system is running a lot of the time with 100% OA in the spring and fall and it plays havoc with the owner's entrance door closers.