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[EnergyPlus_Support] Need help in understanding the error





What does the following error mean. 
** Severe  ** Sizing: Coil:Cooling:DX:SingleSpeed "ZONE ONE PTAC COOLING COIL": Rated air volume flow rate per watt of rated total cooling capacity is out of range.
   **   ~~~   ** Min Rated Vol Flow Per Watt=[4.027E-005], Rated Vol Flow Per Watt=[1.433E-005], Max Rated Vol Flow Per Watt=[6.041E-005]. See Input-Output Reference Manual for valid range.
   ** Severe  ** For object = Coil:Cooling:DX:SingleSpeed, name = "ZONE ONE PTAC COOLING COIL", the combination of
   **   ~~~   ** rated air volume flow rate, total cooling capacity and sensible heat ratio yields coil exiting
   **   ~~~   ** air conditions above the saturation curve. Possible fixes are to reduce the rated total cooling
   **   ~~~   ** capacity, increase the rated air volume flow rate, or reduce the rated sensible heat ratio for this coil.
   **   ~~~   ** If autosizing, it is recommended that all three of these values be autosized.
   **   ~~~   **  During Warmup, Environment=RALEIGH_NC_USA ANNUAL HEATING 99% DESIGN CONDITIONS DB, at Simulation time=01/21 00:00 - 00:05
   **  Fatal  ** Check and revise the input data for this coil before rerunning the simulation.


Till now I was using the 'autosize' option. If I need to give my own cooling supply rate and heating air supply rate for a PTAC HVAC how should I go about doing it.

Kindly help.

Regards,

Aditya


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