Honeywell L4079B1058 Open High Pressuretrol Limit Controller M/R 5-50 PSI

The Honeywell L4079B1058 Pressuretrol limit controller is a high quality designed specifically for the protection of HVAC system from pressure damage. Safety seems to work as a component of the system that regulates the pressure and turns the equipment off when pressure goes beyond a certain level. This helps to avoid possible damages to some major components such as the compressors, condenser and piping system. It has a diaphragm that changes with the pressure of the system. When the pressure gets to a certain high level the diaphragm pushes a switch which in turn cuts off electrical power supply to the HVAC equipment. The following is quick to shut off the pressure to prevent more damage.