and inert gas safety shut-off systems

Key Benefits for Contractors High Thermal Stability: The 100% suction gas-cooled motor prevents overheating during heavy-duty cycles

Once the temperature drops to the reset range of 150°F

Engineered for heavy-duty commercial HVAC maintenance and residential applications

The 160/204 setpoints are fixed to ensure the system adheres to strict safety protocols

Carrier HH19ZA174 Limit Switch R-22 and inert gas safety shut-offThe Carrier HH19ZA174 is a technical grade L170 40F limit switch designed for critical thermal regulation within HVAC furnaces and industrial automation systems. This SPDT contact configuration switch acts as a vital safety interlock, featuring an actuation range of 170F (Open) to 40F (Close) to prevent equipment overheating and ensure system integrity. Built with a rugged die cast aluminum housing and an IP65 enclosure rating, it is engineered to