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[EnergyPlus_Support] SetpointManager:MixedAir and Economizer question

Firstly, I have a question regarding how exactly to use the SetpointManager:MixedAir function. There are 4 separate node names that it is asking for after the name/control variable. They are

1. Reference Setpoint Node Name
2. Fan Inlet Node Name
3. Fan Outlet Node Name
4. Setpoint Node or Nodelist Name

Now, The fan inlet/outlet are easy enough but I am confused as to what exactly is meant by the Reference Setpoint Node nmae. It says it is where the system supply air temperature is set and that this is normally the AirLoopHVAC outlet node, but I am a little curious as to where this is. It looks like that in the I/O example that it is listed as Air Loop Outlet Node which is then under the NodeList "Supply Air Temp Nodes" which is then listed as the setpoint for a single zone reheat. So is this reference node the room temperature setpoint you are trying to maintain? Is the "Setpoint Node or NodeList Name" supposed to be the node where the air is mixed (as in the mixed air outlet)?

Furthermore, on another note I have a building where the pneumatic "economizer" is set up so that it the logic basically has it operating where the FA damper is closed at some minimum temperature, then opens to a % relating to the temperature over some range until it is 100% FA at some max temperature. That is to say the FA Damper is @ 0% @ 55 degrees F up until 100% @ 85 degrees F where the range is linear between the two points. What is the best way to do this?



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