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Compact rectangular actuator in matte grey plastic with mounting shaft and wiring terminals

Honeywell

Honeywell M847D Zone Valve Actuator smart thermostat

SKU CH-HYHM-PN3VM

Low-voltage spring-return damper actuator with HomeKit control, anti-rotation shaft, and direct mounting for 7/16-inch dampers, replacing M847D1004

  • ProtocolHomekit
  • TypeThermostats & HVAC
  • App-EnabledYes
  • Low-voltage spring return protects damper during power loss
  • Anti-rotation and extended drive shaft mount directly to 7/16-inch coupling dampers
  • Direct replacement for M847D1004 simplifies upgrades
  • Compact 3.4 x 4.5 x 2.4-inch design fits tight mechanical spaces
  • Lightweight 1.1-pound unit eases handling and installation

Honeywell M847D Zone Valve Actuator

The Honeywell M847D is a low-voltage, spring-return damper actuator designed to operate ARD, EARD and ZD zone dampers in HVAC zoning systems. It mounts directly to 7/16-inch diameter coupling style dampers using the supplied anti-rotation bracket and drive shaft extensions. The unit serves as a direct replacement for the M847D1004 model.

Suits installers replacing a failed M847D1004

This actuator fits only 7/16-inch coupling dampers and provides two-position spring-return control. It is not for systems that require modulating or multi-position damper control, nor for dampers with a different shaft size or mounting pattern. Buyers needing continuous position feedback or a different voltage should look at other models.

Spring-return two-position operation

The actuator delivers two positions driven by a spring-return mechanism, so the damper returns to its default state when power is removed. This behaviour decides whether the part matches the control logic of the zoning panel in use.

Highlights

  • Low-voltage spring return protects damper during power loss
  • Anti-rotation and extended drive shaft mount directly to 7/16-inch coupling dampers
  • Direct replacement for M847D1004 simplifies upgrades
  • Compact 3.4 x 4.5 x 2.4-inch design fits tight mechanical spaces
  • Lightweight 1.1-pound unit eases handling and installation

Specifications

BrandHoneywell
ModelNot Available
ProtocolHomekit
TypeThermostats & HVAC
App-EnabledYes

Questions about this item

What damper shaft size does the 7/16-inch coupling on the M847D fit?

The actuator mounts directly to 7/16-inch diameter coupling-style dampers using its built-in drive shaft extensions and anti-rotation bracket.

Which wiring step is most often missed when installing this spring-return actuator?

Connecting the low-voltage control wires to the correct terminals so the spring-return function operates on power loss.

What component replaces the M847D1004 when it reaches end of life?

This M847D actuator is a direct replacement for the M847D1004, matching its mounting pattern and low-voltage operation.

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