BM-PTA-40405-01N00-0 thermal actuators are designed for controlling control valves in HVAC automation systems. The thermal actuator is controlled by 0…10Vdc control signal. When the control signal is under 0,5V, the actuator moves to stand-by mode for 20 minutes to ensure fast response time. After the stand-by mode the actuator moves to power saving mode. The actuator calibrates automatically when power is switched on for the first time. The actuator calibrates also when the control signal is over 2 V for 24 hours. During the calibration cycle, the actuator is driven to closed position and is kept closed for 20 seconds. The actuator returns to the control signal position after the calibration.