Lennox 31J37 High Pressure Switch

The Lennox 31J37 High-Pressure switch and is a fundamental safety accessory for HVAC equipment such as refrigeration equipment including air conditioners and heat pumps. It also serves as a protector from pressure rise by measuring the refrigerant pressure in the system. This switch is adjusted to a maximum pressure of 410 PSI. If the pressure rises beyond this limit, the switch pulls a circuit to shut down automatically to protect compressors and other parts. This safety feature protects the whole HVAC system as well as assists in preserving the equipment.