Free Standard Shipping on Orders $25+ Continental USA only

  Shipping to Alaska, Hawaii, and International shipping to Canada extra. Please place the order and factory will advise of additional shipping amounts prior to shipping. 

Credit Cards will not be charged until shipping amounts are verified. 


Expedited shipping available. Please call for pricing. 

Tired of replacing spring return damper motors that get hot and burn out?

The Belimo LMB24 is one of the finest damper motors on the market today, with a five year factory warranty and outstanding reputation. This kit gets the premier commercial grade Belimo LMB24 damper motor and adapter kit for about the same price as the the stock 2-wire spring replacement motor. This kit will also work on almost any damper where the original motor had the output shaft of the Synchron motor shown in the last picture (motor with 2 yellow wires)

This kit works on most dampers that had a Hansen Synchron or Cramer 2- wire "spring return” motor that has the output shaft shown in the last picture. 

MAKE SURE the output shaft of your motor looks like the one in the last picture, the motor with the two yellow wires. Check the 5 digit number on the side on your synchron motor, that ends in an "R" or an "L". This kit will retrofit any motor, with the much finer Belimo LMB24, that has the Cross pin end on the motor shaft. 

These Synchron numbers will cross over to this kit:

38398L 37789R 38766R 38929L 39154R

The Belimo LMB24 Kit4 includes the Belimo LMB24-3-T motor, shaft adapter, capture bracket, anti rotation bracket and two self tapping sheet metal screws shown in the first picture; anything else in the other picture is for illustration purposes only.

Our Pictures:

1. This is what you get with this retrofit motor kit, any items shown in other pictures are for illustration purposes only.

2. Belimo LMB motor shown mounted to old damper, old Synchron motor in foreground. Works on round dampers as well.

3. The slotted input of the damper after old motor is removed.

4. Illustrated instructions, also available on how to hook up this 3 wire motor to a zone control panel with only two damper outputs terminals.

5. Brackets from kit mounted on damper, before motor is installed (damper is laying on its side)

6. Another picture of Belimo LMB motor mounted on the old damper.

7. Old take off Synchron brand motors, remove your old motor and make sure your old motor has the identical

output shaft with cross pin (Synchron motors were made with many different outputs). 

*Retrofits the industry leading LMB24-3-T motor on to many residential dampers, including many Lennox, Regulator, Enerzone Systems Corp., Retrozone Inc., Jackson Controls, others who used this style of Synchron or Cramer motor.

*5 year warranty

*Gets rid of spring return motors for better reliability and energy savings.

*Works with any brand of standard 24vac zone control system.

*Saves energy, extends motor life, far more powerful motor with 5 year warranty.

*Requires three wires to motor and the mounting of the anti-rotation bracket with two self tapping screws, included.

*24vac 2 va damper motor

*Part no. LMB24-Kit 4

Spring return damper motors pull 8 to 10 va of continuous power since they must overcome the return spring. Besides wasting energy, the spring return motors get very hot, contributing to their often premature failure. The Belimo LMB24-3-T retrofit kit motor uses just 2va for 90 seconds, and never even gets warm to the touch! A five year warranty is best in the business, so stop replacing those overpriced spring return motors! 

Your current damper has just two wires to the motor, will this 3 wire motor work? Yes, but you will need a third wire from the zone control panel or thermostat to allow this 3 wire motor to work-very often, standard 4 wire thermostat wire will have been used so check the cable for extra wires. Most zone control panels support three wire motors, including all Honeywell panels, check your zone control board damper outputs for an unused terminal, if your damper outputs are labeled M1,M4, and M6, OR Power Open PO. Power Close PC and Common C, you have all the outputs you need and are good to go.

Even if your zone panel has just two damper outputs, you can still use this kit since the Belimo LMB motor will accept an alternative wiring procedure that places full time 24vac power on terminals 1 and 2, and then uses the current zone board output for terminal 3. Full illustrated instructions are included.

Two-wire kits available with 24 or 120 volt motors. Please see our ad for the TFB Kit4.