TRUEZONE Replacement Actuator for Normally Open Dampers

TRUEZONE Replacement Actuator for Normally Open Dampers

The Honeywell M847D-ZONE is a 24V spring return actuator designed to replace worn or failed motors in Honeywell ARD, EARD, and ZD zone dampers. This two-position, power-closed/spring-open actuator operates normally open dampers in residential and light commercial HVAC zoning systems. The unit ships as the actuator motor only and does not include mounting hardware. This item no longer comes with hardware included. For normally closed dampers, use SKU: M847D-VENT.

Key Features & Benefits

• Direct Replacement Compatibility: Replaces M847D1004 and earlier ARD/ZD damper actuators with identical mounting and wiring.
• 24 Volt Operation: Low voltage design integrates with standard HVAC control systems.
• Spring Return Safety: Motor powers closed; spring opens damper to fail-safe position when unpowered.
• 30-Second Power Open/10-Second Spring Return: Motor timing ensures reliable damper positioning during zone calls.
• Adjustable Range Stops: Simplified internal stops allow field adjustment of damper travel limits.
• Two-Wire Control: Terminals M1 (Power) and M6 (Common) handle all control functions.
• LED Indication Option: Optional M4 terminal connection provides visual status feedback.
• Normally Open Damper Design: Spring holds damper in open position when zone is not calling, preventing airflow blockage.
• Low Voltage, Spring-Return Damper Actuator: Designed for reliable zone control operation.
• Replacement Motor for ARD and ZD Zone Dampers: Application-specific design.

Compatibility & Requirements

This actuator mounts directly to Honeywell ARD, ARDTZ, ZD, and ZDTZ zone dampers manufactured for normally open operation. Verify the existing damper's normal position before ordering; dampers that spring closed when unpowered require the M847D-VENT actuator instead. The actuator requires a 24V AC power supply from the zoning panel. Installation must be performed by a qualified HVAC technician familiar with zoning system wiring and damper operation. Use only with dampers designed for M847D-series actuators; improper mounting may damage the drive mechanism. Mounting hardware is not included and must be sourced separately or reused from the existing actuator. Wires to motor: 2.

Installation & Care

Shut off all power to the zoning system before beginning work. Remove the two wires from the existing actuator terminals and disconnect the actuator from the damper shaft. Slide the new M847D-ZONE actuator onto the damper shaft, aligning the drive coupling. Tighten the shaft set screw using the included allen wrench. Connect the M1 terminal to the powered wire from the zone panel and the M6 terminal to the common wire. If using the LED indicator, connect the M4 terminal to the indicator wire. Restore power and verify the actuator cycles the damper through its full range when the zone calls for heating or cooling. Adjust range stops if the damper does not fully open or close. Do not force the actuator onto misaligned shafts. Keep the actuator dry and free of dust accumulation. Check terminal connections annually for tightness.

What's Included

• M847D-ZONE actuator motor
• Allen wrench for shaft set screw

Warranty & Support

This actuator carries a 5-year warranty from the date of installation.

Frequently Asked Questions

Q: How do I know if I need the ZONE or VENT version of the M847D actuator?
A: The ZONE version is for dampers that spring open when unpowered (normally open); the VENT version is for dampers that spring closed when unpowered (normally closed). Disconnect power from your current actuator and observe which direction the damper moves to determine the correct replacement.

Q: Can this actuator replace the older M847D1004 and M847D1012 models?
A: Yes, the M847D-ZONE directly replaces the M847D1004 and M847D1012 actuators on normally open dampers with identical mounting and wiring, though it uses a simplified three-terminal design instead of the older two-terminal configuration.