250 PSI Pressure Rating: Engineered for high-pressure environments where standard controllers fail

Enhanced Durability: Constructed to rigorous OEM technical specifications for long-cycle reliability in high-ambient temperature environments

Protective Overrides: Features terminals for optional outdoor thermostats or humidistats to lock out ventilation during unfavorable weather

the controller prevents the system from running the condenser fans unnecessarily during low-load periods

effectively preventing motor misalignment and reducing parasitic vibration that can lead to premature component failure

Carrier HH18HA497 Limit Switch 319852-301 250 PSI Pressure Rating: EngineeredThe Carrier HH18HA497 Limit Switch is a critical safety component designed for precise thermal monitoring in residential and commercial furnaces. As a genuine OEM replacement part, this 190 degree open limit switch is engineered to open the electrical circuit when the heat exchanger cabinet reaches its maximum safety threshold, preventing equipment damage and hazardous conditions. When the temperature drops to the 150 degree close setpoint, the switch