Advanced Air has launched their extended range of EPIC Fan Coil Units which all include ECM motor technology.
The company says that by combining the EC motor with a smart card developed the first pressure independent fan coil unit in the UK market is available with this feature as a standard at no extra cost.
With a pressure independent fan coil the air volume will remain constant irrespective of pressure changes. This has many advantages which include easy on site or factory setting of the air volume against a voltage signal from the controller or BMS. This means the fan coil when pre-set will give the required air volume when first installed, and as the pressure changes due to dirty filters or changes in flexible ductwork configuration the air volume remains the same.
A further benefit is the airside commissioning at the fan coil is eradicated and just a simple balance at the diffuser is all that is required.
This pressure independent feature is achieved by using a “virtual 3D Algorithm” which includes motor speed, torque, fan characteristic, and computes these via the smart card into a constant volume characteristic. As the external resistance to the fan is changed the smart card automatically adjusts the control voltage signal to the motor which changes the speed to maintain constant volume flow.