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[EnergyPlus_Support] WindandStack and night ventilation always off

Dear all,
I'm simulating my building for an university work and I'm trying to evaluate daily summer ventilation with my windows open. I've used WindandStackOpenArea object and it works well but, I don't understand why, during night time from 23:00 to 7:00 I have no ventilation also with schedule "Always on".

ZoneVentilation:WindandStackOpenArea,
    NATURAL_B_T_Sala,        !- Name
    B_T_PAN-Sala,            !- Zone Name
    1.9,                     !- Opening Area {m2}
    Always On,               !- Opening Area Fraction Schedule Name
    autocalculate,           !- Opening Effectiveness {dimensionless}
    150,                     !- Effective Angle {deg}
    ,                        !- Height Difference {m}
    autocalculate,           !- Discharge Coefficient for Opening
    -100,                    !- Minimum Indoor Temperature {C}
    ,                        !- Minimum Indoor Temperature Schedule Name
    100,                     !- Maximum Indoor Temperature {C}
    ,                        !- Maximum Indoor Temperature Schedule Name
    -100,                    !- Delta Temperature {deltaC}
    ,                        !- Delta Temperature Schedule Name
    -100,                    !- Minimum Outdoor Temperature {C}
    ,                        !- Minimum Outdoor Temperature Schedule Name
    100,                     !- Maximum Outdoor Temperature {C}
    ,                        !- Maximum Outdoor Temperature Schedule Name
    40;                      !- Maximum Wind Speed {m/s}

Here the situation in the worst summer day (ventilation = "Energia per ventilazione naturale", blue colums):
http://img850.imageshack.us/img850/5955/ventm.png

How is it possible?
Thanks in advance
 



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