The flow switches have a paddle that’s pushed as your liquid moves through to determine flow. When the paddle reaches a set position determined by the set point, it activates or deactivates equipment. They are single pole, double throw (SPDT) and can either turn one device from off to on (normally open) or on to off (normally closed). They should be mounted vertically into a large-diameter horizontal pipeline, so liquid pushes the paddle. These flow switches are calibrated with water. You can use them with other liquids, but they may not measure accurately if the liquid’s viscosity differs from water.
The BOWA SOLUTION standard application solutions for chillers/heat pumps with screw, scroll & BLDC compressors are designed for arious liquid temperature control. The application solution can manage both air/water and water/water units. The maximum configuration involves six compressors in each circuit, with up to two circuits. The built-in serial ports on the PCB board moreover allow information to be exchanged with the unit actuators (electronic valves, fan controllers, compressor inverter, etc.), thus optimising unit control and efficiency according to system requirements. Complete management of the compressor envelope allows the device to in safe conditions at all times, thus guaranteeing the highest performance. Indeed, whenever the compressor working approaches one of the operating limits defined by the envelope, specific prevention actions are adopted, involving varying compressor capacity (for BLDC compressors), condenser fan speed of condensation (on air/water units) and the opening of the electronic valve. The protection function is available for both BLDC compressors and ON/OFF scroll compressors.
