Siemens Combustion SQM50.264R1G4 Damper Motor

The Siemens SQM50.264R1G4 is a precision reversing actuator specifically engineered for high-accuracy positioning of flow control valves, butterfly valves, and industrial dampers. Designed for demanding combustion applications, this 110V-120V damper motor delivers a consistent 90 lb-in torque with an optimized 8-second 90-degree runtime at 60 Hz. Built for veteran contractors, the unit features a 3/8-inch square, double-ended shaft and is factory-configured for counterclockwise rotation (CCW) when facing the driveshaft, though it supports versatile mounting in any orientation effectively.

This HVAC actuator is equipped with a high-performance electronic circuit board that accepts a standard 4-20 mA control signal for advanced modulation. The internal configuration includes two limit switches and four additional auxiliary switches, allowing for precise setup of ignition, low-fire, and high-fire positions. With an operating temperature range of -4°F to 140°F, the SQM50.264R1G4 damper actuator ensures reliable performance in extreme mechanical room environments while maintaining exceptional repeatability for burner overhauls and system integrations.

Key Benefits

• Superior 90 lb-in torque capacity ensures consistent control of heavy-duty dampers and valves.
• High-speed 8-second runtime provides rapid response for critical air-fuel ratio adjustments.
• Integrated 4-20 mA input simplifies integration with modern PLC and combustion control systems.
• Six adjustable internal switches enable custom staging and precise position feedback.
• Robust IP54-rated housing and reversible motor design provide maximum field installation flexibility.

Common Questions

How do you adjust the auxiliary switches on this actuator?
The internal cams are color-coded and can be adjusted manually to define specific trip points for position feedback. Ensure the AUTO/MAN switch is in manual mode to safely rotate the shaft during cam setup.

Is the SQM50.264R1G4 compatible with 50 Hz power sources?
Yes, this unit is dual-rated for 50/60 Hz. Note that when operating at 50 Hz, the 90-degree travel time increases from 8 seconds to 10 seconds due to the reduction in motor speed.

Can I manually override the signal to check damper travel?
The unit features a dedicated manual/automatic toggle switch. Pressing the silver shaft release button disengages the gear train, allowing for visual verification of linkage travel without powering the motor.

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Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.