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If the limit switch is open
This lock-up style gas regulator is built for high-demand applications
the outdoor unit failing to engage
Durable Construction: Built for high-pressure HVAC applications with a 52# rating
Siemens Building Technology 540-660B Sensor 318172-701 If the limit switch isThe Siemens 540 660B Sensor is a staple 10K Ohm NTC thermistor designed for precision environmental monitoring in commercial HVAC applications. Engineered for seamless integration with Siemens Terminal Equipment Controllers (TEC) and LONMARK compliant systems, this Type II NTC thermistor offers a reliable sensing range from 55F to 95F. As a veteran grade wall mount room temperature sensor, it features an integrated set point slide and a flush mounted