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Hi Aaron and thanks for the answer!

About the Actuated Component Unique Name, I guess I didn't explain my self well since accidentally I didn't include the hole input for the radiant panel, in which i set the heating schedule on EMS_Heat_Living and which I'm copying below

ZoneHVAC:LowTemperatureRadiant:Electric,

Panel_1,             !- Name
On 24/7,                 !- Availability Schedule Name
LivingRoom,  !- Zone Name
FloorSubsurface,  !- Surface Name or Radiant Surface Group Name
HeatingDesignCapacity,   !- Heating Design Capacity Method
240,                     !- Heating Design Capacity {W}
,                        !- Heating Design Capacity Per Floor Area {W/m2}
1,                       !- Fraction of Autosized Heating Design Capacity
MeanAirTemperature,      !- Temperature Control Type
0.5,                     !- Heating Throttling Range {deltaC}
EMS_Heat_Living;         !- Heating Setpoint Temperature Schedule Name

EnergyManagementSystem:Program,

Living_HeatingProgram,   !- Name
IF Livingroom_Tair < 19.5,  !- Program Line 1
Set EMS_Heat_Living_Override = 50,  !- Program Line 2
ELSEIF Livingroom_Tair >= 20.2,  !- A4
Set EMS_Heat_Living_Override = 0,  !- A5
ENDIF;                   !- A6

EMS_Heat_Living is a Constant Schedule for the set point temperature that I created. Should it be fine like this?

I understand what you say about the fraction of capacity, but that should work if I'd be able to modify the capacity directly and considering what said about the internal variables for the EMS I thought that wasn't possible.

My first goal using the EMS was to control the amount of power released by the panel. Setting the set point temperature with the EMS on 50°C makes the system release full power (240 W), which I checked on the eso file. Then the set point temperature is set to 0°C to turn off the system. I know this could sound odd, but I didn't find any other solution to control the power usage and actually in this way it works just like an ON/OFF controller.