Siemens Building Technology QAC22 Sensor 326058-758 then those pairs in parallel)

then those pairs in parallel) to maintain the required 10k ohm resistance for the thermostat logic

this outdoor reset sensor allows the boiler to dynamically adjust its firing rate and supply water temperature based on external conditions

The ZoneFirst RDP-12 is a professional-grade 12 inch round damper engineered for precision airflow management in residential and light commercial HVAC zoning systems

Precise Airflow Control: Programmed to maintain consistent CFM levels for optimized heat transfer and indoor comfort

Siemens Building Technology QAC22 Sensor 326058-758 then those pairs in parallel)The Siemens Building Technology QAC22 Sensor is a precision passive outdoor temperature sensor engineered for weather compensated control in high performance HVACR systems. Utilizing an LG Ni 1000 ohm sensing element (Ni RTD, 1k Ohm @ 32F), this unit provides a highly stable output signal across a wide operating range of 58 F to 158 F ( 50 C to 70 C). Designed for standard building automation systems, it accurately monitors outdoor air temperature