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Rugged Durability: Manufactured with high-quality materials to resist corrosion and structural warping over time
or the differential between two pressure sources
the Lennox 10X87 is the updated manufacturer part number that directly replaces older 103976-01 controllers
Look for a humming motor that fails to start
Siemens Building Technology GRD126.1U Actuator 340155-7026 Rugged Durability: Manufactured with high-qualityThe Siemens Building Technology GRD126. 1U Actuator is a heavy duty 24V fire and smoke damper actuator designed for two position control in high stakes life safety systems. Delivering 30 lb in torque, this spring return actuator is engineered to meet UL 555 and UL 555S standards, ensuring dampers reach a fail safe position during a power loss or fire event. With a rapid 30 second drive time and a 15 second spring return, it manages combination fire