I want to built-up a chilled water cooling system with a single phase inverter condensing unit. The temperature of the cooling water will be maintaining at around 8 degrees C. But how am I going to produce a signal to the condensing unit to call for the inverter condensing unit to start and also to control the temperature of the chilled water. Is it possible to start an inverter condensing unit without using the indoor pcb circuit and controls, how am I able to control the temperature, please advice, thank you for your feedback.