Daikin-McQuay 349956813 Pressure Switch 319852-301 a 10k ohm duct temperature

a 10k ohm duct temperature sensor for high/low limit protection

With an inlet/outlet size of 1/2" NPT (or 3/4" with reducers in some historical Lennox kits)

the Lennox 87H92 Limit Switch is a critical safety component

including the corresponding UDBP and UDBS separated combustion variants

Daikin-McQuay 349956813 Pressure Switch 319852-301 a 10k ohm duct temperatureThe Daikin McQuay 349956813 is a critical high limit air pressure switch engineered for precise monitoring and safety regulation within commercial HVAC systems and air handling units. Designed as a pressure control high limit air press S, this OEM component utilizes an internal diaphragm mechanism to detect excessive airflow pressure, triggering the control circuit immediately when pre established safety thresholds are surpassed. This Daikin HVAC