Energyplus temperature goes down on nights and weekends
We have developed an algoritm that is controlling a cooling and heating setpoint in an Energyplus model (idf file). We are setting the heating and cooling setpoint through the BCVTB-interface for each timestep. Output is the zone temperatures. But even though the heating setpoint is set to 21C degrees for the period the zone3 temperature is going down to about 15C degrees on the night and weekends.
My question is what setting in OpenStudio that could affect the temperature to go down on nights and weekends. We want the temperature to be between 21C and 25C degrees.
Temperatures: https://ibb.co/Fq1JmST
We have not dived into energy plus that deep but it is probably some schedule setting those things.