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According to the Input Output Reference page 1586 there is only One of the three fileds; Field:Carbon Dioxide Setpoint Schedule Name , Field:Minimum Carbon Dioxide Concentration Schedule Name and Field:Maximum Carbon Dioxide Concentration Schedule Name that should be used when you select System Outdoor Air Method = IndoorAirQualityProcedurein the Controller:MechanicalVentilation object. So the only one that should matter is the Carbon Dioxide Setpoint Schedule , in your case it is the CO2 Setpoint schedule. If I may take a guess I think that you should change the value in the CO2 Setpoint to 0.0004 as it is PPM.

According to the Input Output Reference page 1586 there is only One of the three fileds; Field:Carbon Dioxide Setpoint Schedule Name , Field:Minimum Carbon Dioxide Concentration Schedule Name and Field:Maximum Carbon Dioxide Concentration Schedule Name that should be used when you select System Outdoor Air Method = IndoorAirQualityProcedurein the Controller:MechanicalVentilation object. So the only one that should matter is the Carbon Dioxide Setpoint Schedule , in your case it is the CO2 Setpoint schedule. If I may take a guess I think that you should change the value in the CO2 Setpoint to 0.0004 as it is PPM. and your schedule is dimensionless. Or better make Sure there isn't any warning in the eplusout.err file, regarding the DCV.