internal orifice sizing and spring rates are optimized for R22/R407C pressures

Cold Climate Reliability: Essential for systems operating in low-ambient environments where cold-start damage is a frequent concern for contractors

rhythmic vibrations

preventing corrosion and ensuring consistent performance in demanding commercial environments

Carrier HH19ZA156 Limit Switch 30067439-890 internal orifice sizing and springThe Carrier HH19ZA156 Limit Switch is a critical OEM safety component designed for precise thermal regulation within Carrier, Bryant, and Payne furnace assemblies. This normally closed disc style switch acts as a primary high limit safeguard, engineered to interrupt the electrical circuit and terminate the heating cycle when internal plenum temperatures reach the 155F open setpoint. Once the heat exchanger cools to the 105F close setpoint, the