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Mini Split LOUVER MOTOR Training Project

Updated: Jan 26

Explaining how a louver motor operates is much easier when you can watch the louver blade move, each step of the way. This project is meant to simplify the operation of the louver motor by visually showing the louver blade movement as 12V power is temporarily applied to each of the 4 electrical coils in sequence.


Why does the Louver Motor Matter?

The louver motor is often an overlooked component on ductless systems. That is of course, until the unit isn't allowing the air to be distributed properly. On a ductless indoor mini split unit, louver motors are used to move, open, and close any vertical and horizontal louvers. The primary function of any louver motor is to open and close the louvers before and after operation. A secondary purpose is to increase comfort, with some systems allowing multiple settings for louver position and movement. Unfortunately, the failure of this small component can result in several problems, especially if the failure takes place while the louvers are closed. Fortunately, this project is designed to help students understand exactly what is taking place within the louver motor so that they can test for proper operation in the field. To learn more about the louver motors, watch this video: https://youtu.be/-fgVvwb6HnE and to learn more about inverter mini splits, check out our book: https://www.acservicetech.com/mini-split-book


Building the Display

A louver motor training display can be built in a number of ways, using a variety of different materials. For this example, the tools, parts, and steps are listed below:


Tools Required
  • Standard Drill

  • Uni-Bit also known as a Step-Bit

  • 1/4" Hex Head Bit

  • Wire cutter/stripper

Parts Required
Step #1

Cut an 8" length from the backing board. This will be the base for building the remainder of the project.


Step #2

Using a vice (or similar equipment), flatten the (5) one hole metal straps.


Step #3

At this point, it's a good idea to do a rough layout of the parts to ensure everything fits and that the tabs, wires, batteries, and louver motor are all in the proper location.


Step #4

After making sure everything will fit with enough clearance for testing and mounting, drill a large hole with a Uni-Bit into the backing board for the back of the louver motor to fit in. This can usually be tension fit in place.


Step #5

Next mount the AA battery holder case using the command strips. Make sure the wires are accessible for connection to the louver motor and probe.


Step #6

Cut the end off a multimeter probe wire and wire nut the end of the probe wire to the red wire from the battery holder.


Step #7

Set the louver motor body in the drilled hole. While in place, make sure the wiring from the louver motor will reach the correct location for the tabs. Cut the wires to length and strip the ends. (Note: It is good practice to leave the wires from the louver motor long until the final sequence of wiring is determined.)


Step #8

Determine the correct sequence for the wires. Refer to the video below for a full explanation of this process. Once the common wire has been identified, mount it, along with the black wire from the battery holder, under a single metal one-hole strap. This should be mounted near the bottom of the board, out of the way. Alternatively, these two wires can be wire nutted together and secured out of the way.


Step #9

Mount the metal one-hole straps using 1/4" zip screws and snuggly secure each wire in sequence under the flattened straps.


Alternative Path

As stated previously, this only represents one way to create a training display. An alternative method would be to mount a base with the battery holder and tabs onto the side of an indoor wall mounted unit. From this point, the wires from the louver motor would then be connected to the tabs in the same way as the smaller display. This method would allow students to see the operation of vertical louvers using the same basic setup.


Using the Display

After the display is all connected, turn the power on to the battery case using the switch on the side of the case. The display should now be complete and ready for teaching! If you are interested in learning more about how these displays work and how they can be used for instructing, check out the video below and purchase our Inverter Mini Split Operation and Service Procedures book available on our store!

If you want to know more about Inverter Mini Splits, check out our Book!




Published: 3/29/2023


Author: Brandon Price

About the Author: Brandon is the Director of Production at AC Service Tech LLC and has contributed to the creation of various resources. Brandon has several years of experience as an HVAC installation and service technician and has worked under Craig as an apprentice. Brandon is also the primary project manager as well as web designer and illustrator at AC Service Tech.

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