Carrier HH18HA160 Temp Switch 30067439-890 4" WC (water column) to

4" WC (water column) to monitor flue gas or air pressure within the combustion system

providing the necessary airflow control for specific rooms

including TS194 sensors and optional T115 room override thermostats

Simplified Diagnostics: Equipped with an integral hypodermic needle test point for rapid field pressure verification

Carrier HH18HA160 Temp Switch 30067439-890 4" WC (water column) toThe Carrier HH18HA160 Temp Switch is a critical OEM limit switch designed for heavy duty thermal protection in commercial and residential HVAC systems. Engineered as a safety limit control, this genuine Carrier replacement part monitors the heat exchanger environment, automatically interrupting the burner circuit if temperatures exceed safe operating parameters. With a precise 160F cut out and a automatic 120F cut in reset, it prevents thermal stress