Siemens Combustion SQM33.550A9 Actuator 318973-401 the HH18HA191 is commonly utilized

the HH18HA191 is commonly utilized in window units and PTACs as a safety limit or thermostat-linked control switch

maintaining the correct WC spring range is non-negotiable for system safety and flame stability

Enhanced Safety: Built-in CSA-approved design regulates fuel flow to the burner assembly while monitoring water temperature to ensure safe operating limits

The clockwise (CW) rotation for this York fan blade is determined by viewing the discharge side of the blade

Siemens Combustion SQM33.550A9 Actuator 318973-401 the HH18HA191 is commonly utilizedThe Siemens SQM33. 550A9 Actuator is a high precision, electromotoric stepper motor designed for the load dependent control of gas dampers, air dampers, and oil control valves in industrial burner applications. Specifically engineered for integration with Siemens LMV3 (including LMV27 and LMV37) linkageless burner management systems, this reversing actuator provides the accurate parallel positioning required for optimized fuel air ratio management. It