Lennox 31L11 Pressure Switch

The Lennox 31L11 Pressure Switch is an essentialdevice applied in different equipment of HVAC, such as furnaces and ACs. It works as a pressure indicator for the pressure inside the system. If the pressure drops to a level that is not safe to operate the switch causes a shut-off mechanism to operate. This is because this switch prevents possible harm to the compressor which is an essentialpart of your HVAC system and hence results in proper functioning of the system.