Honeywell Modutrol IV Series 71 rotary actuators are 24 VAC modulating motors (non-spring return) designed for precise proportional control of dampers and valves. With field-adjustable stroke, dual-end shafts, quick-connect terminals, optional internal transformers, and rugged NEMA 3 housings, these actuators suit industrial, HVAC, and burner-control applications.
Honeywell Modutrol IV Series 71 non-spring return (NSR) actuators deliver smooth proportional positioning for commercial air handling dampers, industrial process control, and valve assemblies. Because choosing the correct model requires matching precise control signals (4–20 mA or 10.5–13.5 VDC), supply voltage (24VAC vs. 120VAC), torque ratings (75 to 300 lb‑in), and internal auxiliary switch options, verifying technical parameters is essential. Contact our technical sourcing team today to locate your exact replacement or cross-reference legacy hardware.
Honeywell Series 71 motors feature rugged NEMA 3 die-cast aluminum enclosures, oil-immersed gear trains, and non-spring return operation designed to hold position upon power failure. Use this matrix to compare torque output, input signals, and common Series 71 configurations.
| Actuator Class | Control Signal & Drive Logic | Common Series |
|---|---|---|
| Standard Series 71 (NSR) | 24VAC or 120VAC proportional non-spring return actuators accepting 4–20 mA or 10.5–13.5 VDC inputs with torque ratings from 75 to 150 lb‑in. | M7184A1009, M7185A1000 |
| High-Torque Series 71 | Heavy-duty 300 lb‑in non-spring return motors engineered for large multi-blade dampers, commercial air handlers, and large valve linkages. | M7194A1008, M7194D1006 |
| Auxiliary Switch Models | Includes factory-installed SPDT auxiliary microswitches for end-of-stroke position feedback, staging, or equipment safety interlocks. | M7184D1007, M7185D1004 |
Proportional Commercial Air Handler Package
High-Torque Heavy-Duty Valve Drive Assembly
Control Signal & Power Loss Alert: Series 71 actuators are Non-Spring Return (NSR) units and will maintain their last position upon power failure rather than returning to a default fail-safe state. Always verify your signal compatibility (4–20 mA vs. 10.5–13.5 VDC) and stroke limit settings prior to commissioning to avoid signal hunting or mechanical binding.
Honeywell Series 71 Modutrol IV motors excel in applications where fail-safe spring return action is unneeded or undesirable. By holding their last position on power loss, these non-spring return units prevent sudden system pressure shocks or rapid air temperature swings in continuous-duty HVAC processes.
With double-ended drive shafts, oil-immersed gear trains, and field-adjustable stroke limits (90° to 160°), Series 71 actuators offer easy drop-in replacement across both modern electronic control loops and legacy industrial burner setups.
Unsure of your control signal, torque rating, or replacement cross-reference?
Take a snapshot of your existing motor nameplate, damper linkage layout, or control schematics, and our sales team will confirm the perfect match.
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