Lennox 18J74 Low Ambient Pressure Switch

The Lennox 18J74 Low Ambient Pressure Switch is an essential component in HVAC, which aims to ensure the better system response depending on the overall outdoor temperature. This Automatic Pressure Switch is used to avoid any kind of freezing in coils and to work heat pumps and air conditioners properly in cool climates by controlling the refrigerant pressure. It has an automatic reset system meant to ease maintenance by going back to normal operation without interruption. Designed specifically for Lennox heat pump and air conditioning systems, this switch increases energy efficiency and extends the life of equipment by guarding against damage from low pressure conditions while maintaining comfort levels in all types of weather.