HVAC Blower Motors

TelcoGreen is your one-stop shop for a wide selection of heating and cooling applications, including high quality and durable HVAC blower motors, fan products and much more. Our line of fans and blower motors include:

How to Choose Between a Belt Drive or Direct Drive Blower

The air handling unit, which contains the interior components of a heating, ventilation and air conditioning system, is integral to the operation of that equipment and pushing out the warm or cold air through the outlets. Within the air handling unit is the HVAC blower motor, which is connected to the fan that is responsible for sending the warm or cold air out of the HVAC unit.

The air handling unit is also equipped with heat coils that warm the air, whereas an air conditioning unit relies on what’s called a compressor and condenser. The compressor pressurizes a cooling refrigerant causing it to heat up. After it has been heated, the refrigerant is passed through the condenser and then through an opening that allows the refrigerant to cool quickly before it is evaporated and dispersed through the air handling unit. One common symptom that is noticeable when there is a problem with the blower motor for HVAC units is that no air is coming from the outlet. Though other issues may be the cause, the blower motor may not be functioning properly and could require maintenance or replacements.

A heating, ventilation and air conditioning system with a direct drive blower is when the blower motor is connected directly to the fan. As the motor operates and turns the shaft, the fan moves accordingly.

An HVAC system with a belt drive fan is slightly different. With a belt driven configuration, the movement of the fan is not directly related to the rotation of the motor shaft. Instead, the motor shaft is connected to a belt, and the belt is connected to the fan. As the motor operates and the shaft rotates, it turns the belt, which in turn rotates the fan.

Both systems have benefits and drawbacks that can impact overall operation of the system, as well as long-term issues, such as maintenance and replacement of the various components.

The Benefit to Using Direct Drive Blower Motors

As mentioned above, direct drive blower motors do not rely on a belt to operate the fan, which is one advantage this configuration has over a belt drive blower motor and fan configuration. With a belt drive configuration, maintenance and replacement of parts can become more of a concern, as the belt may wear out with time and overuse, leading to additional expenses down the road.

In addition, a direct drive configuration is also more efficient than a belt drive system due to the friction involved with the multiple moving parts and a loss of power overall. Direct drive configurations have a reported efficiency margin of around 80 percent, compared to the belt drive system of around 60 percent.

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