I want to model VAV system with preheating coil.
I/O Reference says "The order of the controllers in the list is significant: controllers are simulated sequentially in the order given in the Controller List. Typically the Controller List would contain a Controller:OutdoorAir. If there are chilled water or hot water coils in the outdoor air system, each such coil will need a Controller:WaterCoil."
I referred to ExampleFiles and found that 5ZoneAirCooled.idf and many idf files based on it have preheating coil and precooling coil before OutdoorAir:Mixer. However, the order of Controllers in AirLoopHVAC:ControllerList is Controller:OutdoorAir -> Controller:WaterCoil for precooling coil -> Controller:WaterCoil for preheating coil. It seems to me that the order of Controllers in AirLoopHVAC:ControllerList is inconsistent with the order of Equipment in AirLoopHVAC:OutdoorAirSystem:EquipmentList.
AirLoopHVAC:OutdoorAirSystem,
OA Sys 1, !- Name
OA Sys 1 Controllers, !- Controller List Name
OA Sys 1 Equipment; !- Outdoor Air Equipment List Name
AirLoopHVAC:ControllerList,
OA Sys 1 Controllers, !- Name
Controller:OutdoorAir, !- Controller 1 Object Type
OA Controller 1, !- Controller 1 Name
Controller:WaterCoil, !- Controller 2 Object Type
OA CC Controller 1, !- Controller 2 Name
Controller:WaterCoil, !- Controller 3 Object Type
OA HC Controller 1; !- Controller 3 Name
AirLoopHVAC:OutdoorAirSystem:EquipmentList,
OA Sys 1 Equipment, !- Name
Coil:Heating:Water, !- Component 1 Object Type
OA Heating Coil 1, !- Component 1 Name
Coil:Cooling:Water, !- Component 2 Object Type
OA Cooling Coil 1, !- Component 2 Name
OutdoorAir:Mixer, !- Component 3 Object Type
OA Mixing Box 1; !- Component 3 Name
What is the correct order of Controllers in AirLoopHVAC:ControllerList in this case? At first, I thought that Controller:OutdoorAir should be listed after Controller:WaterCoil because OutdoorAir:Mixer is located after Coil:Heating:Water and Coil:Cooling:Water, but the ExampleFile shows the different order. I'm not sure if the ExampleFile is correct or not. Or is the order of the controllers not significant actually?
