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Honeywell M847D1012 Actuator, Spring Return Direct Mount Two Position 24 Vac

4.7 out of 5 stars 96 customer reviews
| 4 answered questions

Price: $165.42 + $5.07 shipping
Only 3 left in stock.
Ships from and sold by OMydeals.
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  • Low voltage, spring-return damper actuator
  • Equipped with anti-rotation and drive shaft extensions for direct mounting to 7/16 inch diameter coupling style dampers
  • Adjustable range stops
  • Direct replacement for M847D1004
3 new from $165.00
This item’s packaging will indicate what is inside and cannot be hidden.

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$165.42 + $5.07 shipping Only 3 left in stock. Ships from and sold by OMydeals.

Frequently Bought Together

  • Honeywell M847D1012 Actuator, Spring Return Direct Mount Two Position 24 Vac
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Total price: $189.37
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Product Description

Product Description

Honeywell M847d1012 24 Vac. Spst Two Position, Spring Return, Direct Mount, W/Adjustable

From the Manufacturer

The M847D is a two position, 24 Vac spring return actuator designed to operate ARD, EARD and ZD zone dampers.

Product Information

Technical Details

Part Number M847D1012
Item Weight 2 pounds
Product Dimensions 2.4 x 3.4 x 4.5 inches
Item model number M847D1012
Color Multicolored
Material zinc plated steel, anodized aluminium
Item Package Quantity 1
Batteries Included? No
Batteries Required? No

Additional Information

ASIN B0019KFQ72
Customer Reviews
4.7 out of 5 stars 96 customer reviews

4.7 out of 5 stars
Best Sellers Rank #117,417 in Home Improvements (See top 100)
#1,101 in Home Improvement > Electrical > Testers
#28,623 in Industrial & Scientific > Industrial Electrical
Shipping Weight 1.1 pounds (View shipping rates and policies)
Domestic Shipping This item is also available for shipping to select countries outside the U.S.
International Shipping This item is not eligible for international shipping. Learn More
Date First Available May 15, 2008

Warranty & Support

Product Warranty: For warranty information about this product, please click here

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Customer Questions & Answers

Customer Reviews

Top Customer Reviews

Verified Purchase
I have a three zone HVAC system and started to have problems with the dampers. The first time was a $90 technician call and all he did was "free" the damper. Started having some other problems and a closer inspection found that the damper was not working correctly. Purchased one of these and replaced one on my system. Works great. On closer inspection of the old unit, I noticed the nylon gears had worn badly and the motor gear was skipping on the drive gear creating a clicking noise.

While inspecting the replaced one, heard the tell-tale clicking from another damper. Replaced this one as well. The third one in my system in still working(8 years), but it is only a matter of time before it fails so I purchased a third one and I'm ready when it does. As another reviewer mentioned, the replacement is a piece of cake (one set screw and two wire nuts)and it sure beats paying the technician. There is no telling what he would charge for the part.

Like another reviewer, I'd like to have a better unit, but that may involve a different damper and different programming on my system, so this is the easy fix. Glad Amazon had these available at a good price and quick shipping.
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Verified Purchase
I have a six zone HVAC system in my home and this is the forth Honeywell zone damper actuator to fail in the six years of system operation. When you open it up and take a look at how it's design/constructed you'll understand why they don't last. Real garbage! I should have specified commercial level equipement. I would have saved money and agrevation in the long run.

Update: (2013) These Honeywell residential zone motors (actuators) have continued to to fail. At the 10th year I have replace 9 devices. My decision is to switch to Belimo LMB24-3-T commercial grade zone actuators which have a 5 year warrentee 24V on/off, floating 95 sec 24V on/off, floating 9. Oddly, they cost about the same as the Honeywell cheapo units. You should make sure that your zone controller supports three-wire actuators (Honeywell controllers do) and that you have three wires available in your installation. My installer wired everything with 7-wire cables, so I'm in fat-city!
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Verified Purchase
Just be aware, these specific M847D Honeywell Actuators have a built-in failure point: The larger gear (the driven gear) that is connected to the return spring is made from a plastic material, perhaps phenolic. This forms the gearset with the actuator motor, on which the pinion (driving gear) is mounted. The failure occurs when the plastic teeth on the larger gear finally break off and form a "dead" spot which prevents full rotation of the output shaft. When powered, the motor begins to rotate the driven gear, only to encounter the missing teeth. This produces a "clunking" or "clicking" sound which continues until the actuator is de-energized by the system control. The zone controlled by the actuator is left in the "normal" position, which might result in no airflow, or constant airflow, depending on whether it is "normally open" or "normally closed".
This is a glaring design flaw. This gear could easily be replaced with one constructed from powdered-metal or similar material. That would surely result in a longer life product. I have replaced the same actuator on my home HVAC system zone damper FOUR (4) ! times in the last 10 years. I started doing it myself after paying the HVAC guy $260 the first time! Wish there was a better device for this purpose, but I'm not an expert.
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Verified Purchase
I was happy to see that the gear inside the actuator is now made of metal instead of plastic. I've posted a picture. The date code indicates that the unit was put together in March, 2015. Oddly, they seem to have replaced the set screw with one that takes a much smaller Allen wrench. Afraid of stripping it, I used the screw off an old unit instead.
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We have a 15-year-old 2-zone system. Recently it started making loud banging noises while moving dampers. Called the HVAC serve techs (the same company that installed the system originally) and they charged us $308.95 to replace this motor because the plastic gear was stripped out, plus a $90 diagnostic fee. The technician said they life expectancy on these things is about 10 years.

I didn't actually buy from Amazon this time - our replacement came from our HVAC contractor. But I watched the whole operation, and this unit seems really simple to install. If the other one goes out (we have one on each zone), I will definitely get a replacement here online and install it myself, and save $300+.

In our system, the dampers open via a spring and the motor drives the dampers closed. So with the power off, all dampers are open. The controller sends power to the motors continuously when it wants dampers to be closed. Once the damper reaches the end-of-travel, the motor simply binds and starts getting hot. This is how the unit is designed to work, I'm told. But the motor is only running in the infrequent case when air is requested in one zone but not the other.

I'm told there are more expensive damper motors with longer-lasting brass gears instead of nylon gears. But they are three-wire motors and are driven open and closed, both. That means the motor is running continuously - not just when closing. Our contractor uses the spring-actuated model (this one) because, while cheaper, the motor only runs infrequently, using much less power. Or so I am told by our HVAC technician.
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