Stop replacing those troublesome spring return motors! This Belimo to Honeywell retrofit kit allows you to easily replace the Honeywell M847D, M847D1004, and M847D1012 motors with the powerful commercial grade Belimo LMB 24-3-T 3-wire motor. Retrofit kit comes complete with custom adapter and hardware to install on your damper. Belimo is the largest and most respected commercial damper actuator maker in the world. Now you can escape the problems of 2-wire spring return dampers! Many owners don't realize that all 2-wire spring return dampers pull power continuously to overcome the spring that is trying to pull the damper back to the non-energized position. The result - a motor that wastes energy, gets so hot you cannot touch it, and often fails prematurely. This retrofit kit works as a replacement for Honeywell M847D series motors on popular ZD and ARD dampers, including M847D1004 and M847D1012 motors, and other M847D series motors. Also works as a replacement for Trol a Temp MSR, RDMH, and other dampers. This retrofit kit works on many 24vac round or rectangular dampers from Honeywell, Trol a Temp, AprilAire, ZoneFirst, EWC, Robert Shaw, Research Products, Ztech, Buetler, DuroZone, and others with a 3/8" or smaller drive shaft (other kits available for other size drive shafts). This product carries a 5 year warranty. Works with any panel, including Honeywell and others with a 3-wire damper output. Also works on many zone panels with a 2-wire damper output. Our solid steel shaft adapter ensures higher torque transmission and eliminates the slippage issues common with other adapters.