Carrier HK06WC077 Pressure Switch 30067439-890 using this OEM assembly is

using this OEM assembly is vital for maintaining the factory-rated combustion efficiency and safety standards

allowing for a "dry" upgrade that does not require system depressurization

This ASME Section IV certified safety valve is a staple for veteran technicians managing large-scale boilers and commercial hydronic systems

These components are manufactured to exacting tolerances to handle the thermal expansion and chemical demands of modern HVACR refrigerants and lubricants

Ensure proper terminal connections to the defrost thermostat (sensor) to prevent short-cycling or inefficient heating performance

Carrier HK06WC077 Pressure Switch 30067439-890 using this OEM assembly isThe Carrier HK06WC077 is an OEM replacement 2 stage air pressure switch designed for high efficiency gas furnaces. This dual Hi Lo component features two independent switches in one assembly to monitor inducer motor performance across high and low fire stages. The low fire switch is calibrated for a 0. 22" w. c. break, while the high fire switch is rated for a 0. 43" w. c. break. Manufactured by Honeywell as part number BA6838, this SPST normally open