Lennox Blower Motor Wiring Diagram: Everything You Need to Know

Lennox is a well-known brand in the HVAC industry. Their products have been trusted for decades, and their blower motors are no exception. If you’re trying to install a Lennox blower motor, you’ll need to have a good understanding of the wiring diagram. This article will cover everything you need to know about wiring a Lennox blower motor, and provide some frequently asked questions to help you along the way.

Understanding the Wiring Diagram

Before you start wiring your Lennox blower motor, it’s important to have a good understanding of the wiring diagram. This will help you avoid any mistakes that could lead to a malfunctioning blower motor. A typical Lennox blower motor uses a four-speed motor, and is wired as follows:

Wire Color Function
Black High speed
Blue Medium-high speed
Red Medium-low speed
Yellow Low speed

It’s important to note that the wiring diagram may vary depending on the specific Lennox blower motor you have. Always refer to the manufacturer’s instructions for specific details.

When wiring your Lennox blower motor, you will typically have four wires to work with. These wires will need to be connected to the appropriate terminals on the blower motor. Here’s a breakdown of how to wire each speed:

Wiring High Speed

High speed is typically connected to the black wire. To wire high speed, follow these steps:

  1. Locate the black wire on your Lennox blower motor.
  2. Connect the black wire to the high speed terminal on the blower motor.
  3. Connect the other end of the wire to the high speed terminal on your furnace’s control board.

Wiring Medium-High Speed

Medium-high speed is typically connected to the blue wire. To wire medium-high speed, follow these steps:

  1. Locate the blue wire on your Lennox blower motor.
  2. Connect the blue wire to the medium-high speed terminal on the blower motor.
  3. Connect the other end of the wire to the medium-high speed terminal on your furnace’s control board.

Wiring Medium-Low Speed

Medium-low speed is typically connected to the red wire. To wire medium-low speed, follow these steps:

  1. Locate the red wire on your Lennox blower motor.
  2. Connect the red wire to the medium-low speed terminal on the blower motor.
  3. Connect the other end of the wire to the medium-low speed terminal on your furnace’s control board.

Wiring Low Speed

Low speed is typically connected to the yellow wire. To wire low speed, follow these steps:

  1. Locate the yellow wire on your Lennox blower motor.
  2. Connect the yellow wire to the low speed terminal on the blower motor.
  3. Connect the other end of the wire to the low speed terminal on your furnace’s control board.

Frequently Asked Questions

What happens if I wire my Lennox blower motor incorrectly?

If you wire your Lennox blower motor incorrectly, it could lead to a malfunctioning blower motor. This could cause your HVAC system to fail, or cause damage to other components. Always refer to the manufacturer’s instructions when wiring your blower motor.

How do I know if my Lennox blower motor is working properly?

To know if your Lennox blower motor is working properly, you should listen for any unusual noises or vibrations. The blower motor should also be able to circulate air through your HVAC system. If you notice any issues, it’s best to contact a qualified HVAC technician for repairs.

Can I install my Lennox blower motor myself?

While it’s possible to install your Lennox blower motor yourself, it’s always best to hire a qualified HVAC technician. They have the experience and knowledge to properly install your blower motor, and can ensure that it’s working properly before leaving your home.

How often should I replace my Lennox blower motor?

Lennox blower motors are designed to last for many years with proper maintenance. However, if you notice any issues with your blower motor, it’s best to replace it as soon as possible. A qualified HVAC technician can help you determine if your blower motor needs to be replaced.

What other HVAC components should I check when installing a new Lennox blower motor?

When installing a new Lennox blower motor, it’s also a good idea to check the air filter and ductwork. A dirty air filter can cause your blower motor to work harder, and could lead to premature failure. Leaky ductwork can also reduce the efficiency of your HVAC system, which can cause your blower motor to work harder than necessary.

By following these tips and guidelines, you should have no trouble wiring your Lennox blower motor. Always refer to the manufacturer’s instructions, and don’t hesitate to contact a qualified HVAC technician if you have any questions or concerns.