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Small OA precooling unit

Small OA precooling unit

Small OA precooling unit

(OP)
I'm looking for a manufacturer of a small outside air DX precooling unit in the 300 CFM to 600 CFM size range.  I haven't been able to find anything smaller than 700 CFM.  Any suggestions?

RE: Small OA precooling unit

Why can't you damper the 700cfm airflow rate to suit your 300-600cfm application?  



RE: Small OA precooling unit

(OP)
If you damper it down, hot gas bypass will increase to provide a false load on the compressor, thus wasting energy. Using a 700 CFM unit in a 600 CFM application wouldn't be too bad, but for a 300 CFM application it would be wasting a lot of energy.

RE: Small OA precooling unit

I don't know where you are, but this small a unit is hard to find unless you want a fan-coil unit for finished space or you design your own with  fan/coil/filters.

York makes a low tonnage air handler (used to be Pace/Brod/McClung) but it is expensive.

Residential units can be found this small, but you can't change the fan type/coil size and etc.

RE: Small OA precooling unit

(OP)
I'm in central Florida where humidity is high most of the time.  I'm looking for a small 100% OA DX package unit that will provide dehumidified outside air to a small lab without having to use reheat on the main HVAC unit.

RE: Small OA precooling unit

Try Aaon or Addison I believe they make packaged units with this low a CFM.  I don't know if they publish the data, but their reps will know.  Both make 100% OA units that control both temperature and humidity.

RE: Small OA precooling unit

(OP)
Thanks williamsGA.

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