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 AC system handling unit is the AC blower motor, which is a type of blower motor that 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 a heat evaporator coil that warms 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 conditioner unit. One common symptom that is noticeable when there is a problem with the AC 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.
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 the overall operation of the system, as well as long-term issues, such as maintenance and replacement of the various components.