Because furnace cabinet sizes and BTU outputs vary

Optimized for HVAC system diagnostics

Standard Foot Mounting: Features a universal foot mount design that simplifies retrofitting in existing equipment cabinets

Wide Adjustability: Field-adjustable range from 50°F to 300°F allows for precise calibration across various applications

this switch is compatible with any system requiring a 670/470 PSI cut-out

Siemens Building Technology 535-741-18 Temperature Sensor 318172-701 Because furnace cabinet sizes andThe Siemens Building Technology 535 741 18 Temperature Sensor is a professional grade duct point temperature sensor designed for precise climate monitoring within forced air HVAC systems. Featuring a 100k Ohm thermistor output signal (NTC Type II), this sensor provides high resolution data feedback to Siemens building automation controllers or any compatible North American BMS. The 18 inch rigid probe is constructed from durable galvanized steel