Hi Everyone,

My objective is to control the heating and cooling availability schedule of zoneHvac:IdealAirLoadSystem. I take the following steps.

1) Define a heating and cooling availability on/off schedule in Schedule : Compact, set initial value to 1. 2) Use EMS sensor to get the zone temperature which is used late in EMS program 3) Define EMS Actuator to control heating and cooling availability schedule of IdealAirLoadSystem 4) Define the EMS program to activate the actuator

My Eplus objects are detailed below. I am not sure which calling point to use? No matter which calling point I choose the value of heating and cooling availability doesn't change from 1.

I'd appreciate any help.

Thanks

**Schedule:Compact,
    HeaAva,                  !- Name
    On/Off,                  !- Schedule Type Limits Name
    Through: 12/31,          !- Field 1
    For: Alldays,            !- Field 2
    Until: 24:00,            !- Field 3
    1;                       !- Field 4

Schedule:Compact,
    CooAva,                  !- Name
    On/Off,                  !- Schedule Type Limits Name
    Through: 12/31,          !- Field 1
    For: Alldays,            !- Field 2
    Until: 24:00,            !- Field 3
    1;                       !- Field 4

ZoneHVAC:IdealLoadsAirSystem,
    WestZoneIdealAir,        !- Name
    ,                        !- Availability Schedule Name
    Zone1Inlets,             !- Zone Supply Air Node Name
    ,                        !- Zone Exhaust Air Node Name
    ,                        !- System Inlet Air Node Name
    50,                      !- Maximum Heating Supply Air Temperature {C}
    13,                      !- Minimum Cooling Supply Air Temperature {C}
    0.015,                   !- Maximum Heating Supply Air Humidity Ratio {kgWater/kgDryAir}
    0.01,                    !- Minimum Cooling Supply Air Humidity Ratio {kgWater/kgDryAir}
    NoLimit,                 !- Heating Limit
    ,                        !- Maximum Heating Air Flow Rate {m3/s}
    ,                        !- Maximum Sensible Heating Capacity {W}
    NoLimit,                 !- Cooling Limit
    ,                        !- Maximum Cooling Air Flow Rate {m3/s}
    ,                        !- Maximum Total Cooling Capacity {W}
    HeaAva,                  !- Heating Availability Schedule Name
    CooAva,                  !- Cooling Availability Schedule Name
    ConstantSupplyHumidityRatio,  !- Dehumidification Control Type
    ,                        !- Cooling Sensible Heat Ratio {dimensionless}
    ConstantSupplyHumidityRatio,  !- Humidification Control Type
    ,                        !- Design Specification Outdoor Air Object Name
    ,                        !- Outdoor Air Inlet Node Name
    ,                        !- Demand Controlled Ventilation Type
    ,                        !- Outdoor Air Economizer Type
    ,                        !- Heat Recovery Type
    ,                        !- Sensible Heat Recovery Effectiveness {dimensionless}
    ;                        !- Latent Heat Recovery Effectiveness {dimensionless}**

!-   ===========  ALL OBJECTS IN CLASS: ENERGYMANAGEMENTSYSTEM:SENSOR ===========

EnergyManagementSystem:Sensor,
    ZoneTemp,                !- Name
    West Zone,               !- Output:Variable or Output:Meter Index Key Name
    Zone Mean Air Temperature ;  !- Output:Variable or Output:Meter Name


!-   ===========  ALL OBJECTS IN CLASS: ENERGYMANAGEMENTSYSTEM:ACTUATOR ===========

EnergyManagementSystem:Actuator,
    HeaAvaActuator,          !- Name
    HeaAva,                  !- Actuated Component Unique Name
    Schedule:Compact,        !- Actuated Component Type
    Schedule Value;          !- Actuated Component Control Type

EnergyManagementSystem:Actuator,
    CooAvaActuator,          !- Name
    CooAva,                  !- Actuated Component Unique Name
    Schedule:Compact,        !- Actuated Component Type
    Schedule Value;          !- Actuated Component Control Type


!-   ===========  ALL OBJECTS IN CLASS: ENERGYMANAGEMENTSYSTEM:PROGRAMCALLINGMANAGER ===========

EnergyManagementSystem:ProgramCallingManager,
    myPrograms,              !- Name
    BeginTimestepBeforePredictor,  !- EnergyPlus Model Calling Point
    HeatingAvailabilityProgram,  !- Program Name 1
    CoolingAvailabilityProgram;  !- Program Name 2


!-   ===========  ALL OBJECTS IN CLASS: ENERGYMANAGEMENTSYSTEM:PROGRAM ===========

EnergyManagementSystem:Program,
    HeatingAvailabilityProgram,  !- Name
    IF (ZoneTemp < 19 ),     !- Program Line 1
    SET HeaAva = 1,          !- Program Line 2
    ELSE,                    !- A4
    SET HeaAva = 0,          !- A5
    ENDIF;                   !- A6

EnergyManagementSystem:Program,
    CoolingAvailabilityProgram,  !- Name
    IF (ZoneTemp > 25 ),     !- Program Line 1
    SET CooAva = 1,          !- Program Line 2
    ELSE,                    !- A4
    SET CooAva = 0,          !- A5
    ENDIF;                   !- A6