|Item Weight||2 pounds|
|Product Dimensions||2.4 x 3.4 x 4.5 inches|
|Item model number||M847D1012|
|Material||zinc plated steel, anodized aluminium|
|Item Package Quantity||1|
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Honeywell M847D1012 Actuator, Spring Return Direct Mount Two Position 24 Vac
|Price:||$165.42 + $5.07 shipping|
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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
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Top Customer Reviews
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.
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!
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.
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.Read more ›
Most Recent Customer Reviews
Very good value at the price level, I'm really happy with this order. I give 5 star without hesitating.Published 2 months ago by Shirley
Perfect match for my Honeywell system. Much cheaper to replace than the entire damper system. My whole damper is working great now.Published 3 months ago by Donald L Moffett Jr
This is a product that you do not think about until one fails.There are millions of these installed and when they get old, the return spring can break and then you have no heat in... Read morePublished 4 months ago by Indian Cook
Delivered promptly, just what I needed to repair our furnace damper.Published 5 months ago by George E. Huber