When performing a Reznor gas conversion or replacing a fouled burner orifice

often caused by a restricted flue

allowing for the automation of secondary devices like status lamps or auxiliary heaters

the 7790803 simplifies field installation by providing standardized mounting holes and sufficient internal clearance for secure terminal block access and wiring management

Siemens Building Technology 331-4311 Actuator Els PW 17895 When performing a Reznor gasThe Siemens Building Technology 331 4311 Actuator is a No. 3 Pneumatic Damper Actuator engineered for the gradual or positive control of HVAC dampers and air valves. This robust, metal fabricated unit operates within a 3 to 7 psi spring range and features a 2 3 8 inch stroke, making it a reliable choice for mixing box dampers and unit ventilators. As the direct replacement for MK 693 85, it integrates seamlessly into existing pneumatic systems using