Simple AHU EnergyPlus

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I'm quite new to Air systems in EnergyPlus and I'm trying to model a simple AHU, that should guarantee a minimum level of Outdoor Air and then modulate to meet the temperature setpoints within a single zone.

I tried with HVAC Templates first (tried various Constant Volume and VAV), but it looks like I'm doing the same mistake, since I'm not able to operate the system as described above (it doesn't introduce outdoor air and it doesn't maintain the setpoint within the zone).

My idfs are here (the template and expanded version), if anyone could help me figure out what happens.

Another question: I don't understand why in the HVACTemplate:System:VAV object, the Heating Coil Design Setpoint should be around 10°C (or at least lower than the Cooling Desing Setpoint, otherwise it produces errors). Looking at the InputOutput Reference, I interpreted this field as the setpoint of the Air leaving the Coil (which should be higher than the Cooling Setpoint and higher than the Room Air setpoint), but probaby this interpretation is wrong. How should I interpret this field?

Thanks.

UPDATE: I solved the problem with the setpoint introducing a Reheat, but still it's not clear to me how to set up the setpoint managers (e.g. the chiller operates the whole year because it doesn't shift from the cooling to the heating setpoint).