Title: Aggregatkjøring.pdf.pdf
The air flow rates of supply and extract air are controlled separately. The supply and extract air at low, normal, high airflow are set separately on the control panel. On each fan a pressure transmitter measures the difference between the pressure before the fan and the pressure at the measuring probe in the inlet cone. Through a formula with a factor for each fan size, the output signal from the pressure transmitter is used to calculate the actual airflow. A PID-controller maintains the set point value by controlling the speed of the fans.Supply fan with EC motorThe supply air fan is driven by an EC motor with the impeller mounted directly on the motort. All parameters in the motor speed control have been configured and tested from factory.Extract fan with EC motorThe extract air fan is driven by an EC motor with the impeller mounted directly on the motor. All parameters in the motor speed control have been configured and tested from factory.Prepared for control of heating coil