this is a "cold control" with an SPST switch that opens on temperature drop

and recirculating pumps in complex Building Automation Systems (BAS)

this nozzle is a Delavan 30609-9 part and is commonly used in various waste oil burners

Heat Pump Ready: Features a built-in check valve that facilitates seamless operation in both cooling and heating modes

Schneider Electric (Barber Colman) MA41-7073-502 Actuator THPU32HP7Y this is a "cold control"The Schneider Electric (Barber Colman) MA41 7073 502 is a heavy duty, 24V spring return damper actuator engineered for precise two position control in demanding HVACR applications. As part of the SmartX MX41 7xxx series, this model delivers a consistent 60 in lb torque rating, ensuring a reliable fail safe close off for air handling units, VAV terminals, and central fan systems. Designed for immediate direct mount installation onto round or square