What happens to the low side pressure in a low side float (LSF) system as the temperature increases?

In a low side float (LSF) system, the low side pressure is directly related to the temperature of the refrigerant. As the temperature of the refrigerant increases, its pressure likewise increases, following the principles outlined by the ideal gas law. In HVAC systems, especially in refrigeration, as the refrigerant absorbs heat and the temperature rises, the molecules move more vigorously, resulting in a higher pressure.

The relationship is essential for the proper functioning of the system. The low side float mechanism assists in controlling the flow of refrigerant based on the pressure and corresponding temperature, ensuring that the evaporator can absorb sufficient heat and maintain the desired cooling effect. Therefore, as temperature rises within a low side float system, the expected change in low side pressure is an increase. Understanding this relationship is crucial for HVAC technicians to optimize system performance and troubleshoot effectively.