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[EnergyPlus_Support] humidity ratio = -999





In the output as "System Node Setpoint Humidity Ratio" I get -999 kgWater/kgDryAir (constantly) in all the nodes. What can be the reason of this error?
There are AHUs for the dehumidification and I imposed 

SetpointManager:MultiZone:Humidity:Maximum,
    SM 0terra mag_uff_sud2,  !- Name
    Air Loop 0terra mag_uff_sud2,  !- HVAC Air Loop Name
    0.005,                   !- Minimum Setpoint Humidity Ratio {kgWater/kgDryAir}
    0.012,                   !- Maximum Setpoint Humidity Ratio {kgWater/kgDryAir}
    Air Loop 0terra mag_uff_sud2 AHU/1 Cooling Coil Air Outlet Node;  !- Setpoint Node or NodeList Name

The values of "Site Outdoor Air Humidity Ratio Environment" are normal (between 0.006 and 0.019 kgWater/kgDryAir).

Regards


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