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[EnergyPlus_Support] HVAC error

Hello all

I have a problem with modeling HVAC systems for my simulation. I'm trying to simulate a normal residential flat and my problem is twofold;

a) I don't know which fields to use to most closley approximate a normal split type air conditioning unit found in homes.

b) I keep getting the following error messages when I use a thermostat object, a Zone:Unitary object and a System:Unitary object like it says in the "getting started" .pdf file:

** Warning ** Coil:Cooling:DX:SingleSpeed "MY ROOM SYSTEM COOLING COIL" - Full load outlet air dry-bulb temperature < 2C. This indicates the possibility of coil frost/freeze. Outlet temperature = 1.38 C.
**   ~~~   **  ...Occurrence info = YEAR, 01/11 07:45 - 08:00
**   ~~~   ** ... Possible reasons for low outlet air dry-bulb temperatures are: This DX coil
**   ~~~   **    1) may have a low inlet air dry-bulb temperature. Inlet air temperature = 12.320 C.
**   ~~~   **    2) may have a low air flow rate per watt of cooling capacity. Check inputs.
**   ~~~   **    3) is used as part of a HX assisted cooling coil which uses a high sensible effectiveness. Check inputs.

This error message is repeated over a thousand times for different occurances and zones.

Can anyone help?
Thanks for your time.
Fady Sherif Adly



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