Carrier HK02ZA376 386-280 PSI Pressure Switch

The Carrier HK02ZA376 is a pressure switch to protect the Carrier HVAC system. It works by measuring pressure in the system, which is normally in the range of 386 PSI and 280 PSI. When pressure levels are either low or high in the above range, this switches on/off other HVAC parts through its on/off signals. For instance, a certain amount of pressure drop might mean the compressor needs to be stopped so that the damage does not increase, as well as an excessive rise of pressure might activate certain pressure relief valves. Being a pressure control switch, it helps protect the HVAC system from damage that may result from abnormal pressure levels.