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[EnergyPlus_Support] "Self-Contained Units" with Water to Air Economizer

I'm trying to simulate a system using "self-contained units."  These are not widely used.  Trane and McQuay manufacture these.  They have multiple (2-4) water cooled DX compressors and a water to air condenser water economizer.  When the condenser water temperature is low a bypass valve in the unit opens allowing pre-cooling and if low enough the compressors turn off completely.  Many hours during the winter the economizer can meet the entire cooling load.  I attached a simple diagram in the User Exchange folder that hopefully helps describe these units

I've searched the documentation and have two concerns...

1) I see no mention of a water to air economizer.  Did I miss something?  Will EnergyPlus produce errors if I use a chilled water coil on the condenser water loop as an economizer or is that even possible?  How do I model the economizer?

2) The coil option Coil:Cooling:DX:TwoStageWithHumidityControlMode has two stages...is two stages the maximum number?  Can this template handle more than two stages.  How do I model units with more than two stages?

Thanks for the help
DG



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