Honeywell 4074EDC Resistor Kit

Upgrade your Honeywell Series 90 Modutrol IV Motors with the Honeywell 4074EDC Resistor Kit, a precision-engineered solution for integrating 4-20 mA control signals into your HVACR systems. This kit, identical to the 4074EDC/U, is specifically designed to interface a single M91xx motor with high-precision 4-20 mA controllers, ensuring seamless modulation for industrial and commercial dampers or valves. As an experienced technician, you know that accurate resistance is critical; this kit includes a 66.5 Ohm resistor (placed across terminals W and R) and a 237 Ohm resistor (placed across terminals B and R) to provide the exact voltage drop required for proper actuator response.

The 4074EDC serves as a reliable 4-20mA to Series 90 converter, allowing legacy or current-loop controllers like the UDC series, Dialatrol, or Dialapak to drive Modutrol IV actuators. By utilizing these high-tolerance components, you maintain high signal integrity and prevent hunting or inaccurate positioning in the field. This Honeywell resistor assembly is a standard requirement for contractors performing actuator control signal conversion or retrofitting Series 90 equipment for modern automation protocols.

• Universal Compatibility: Specifically designed for Honeywell M91xx and M94xx Modutrol IV motors.
• Direct Interface: Seamlessly converts 4-20 mA analog signals for use with 135-ohm proportioning circuits.
• Precise Modulation: Includes high-accuracy 66.5 Ohm and 237 Ohm resistors for stable actuator positioning.
• Reliable Performance: Robust construction ensures longevity in demanding industrial control environments.
• Easy Installation: Mounts directly within the motor wiring box for a clean, professional finish.

Can I use the 4074EDC with multiple motors?
No, this specific kit is engineered to drive one M91xx motor. For unison control of multiple actuators, a different configuration or the 4074EED kit is required.

What is the difference between the 4074EDC and 4074EDC/U?
The units are technically identical. The "/U" suffix simply denotes a "Universal" TRADELINE version packaged for easier stocking and replacement in the field.

Where are these resistors installed on the Modutrol motor?
The 66.5 Ohm resistor is typically connected across terminals W and R, while the 237 Ohm resistor is connected across terminals B and R to facilitate the 4-20 mA signal conversion.

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.