This model is the primary direct replacement for I-31-1 and 23739 models

at which point the contacts close to energize the blower motor

it delivers a reliable 1

What causes a 155F limit switch to trip frequently

Key Benefits Precise Thermal Control: Calibrated for 120-181°F

Siemens Building Technology 536-778 Sensor R-134A This model is the primaryThe Siemens Building Technology 536 778 is a high precision outside air temperature sensor engineered for demanding building automation and HVAC control strategies. Utilizing a 100k Ohm NTC thermistor sensing element, this unit provides a highly stable resistance output that corresponds to ambient thermal changes, ensuring your building controller receives accurate data for outdoor reset and ventilation logic. Housed in a ruggedized metal enclosure,