Lennox 52M40 Pressure Switch SPST

The Lennox 52M40 Pressure Switch SPST Relay is a safety device, which is installed in HVAC systems to control pressure. It works like a pressure switch in that it controls the ON/OFF of connected equipment such as compressors and fans at set pressure values. For example, if it is too much pressure, the switch is capable to cutting the air supply off to the compressor so as not to cause harm. However, if the pressure goes low the switch can turn on the compressor to provide airflow into the passage. This serves as a way of maintaining your HVAC system properly and efficiently, homemakers' comfort level is also enhanced.