Heating, Ventilation, and Air Conditioning (HVAC ) Electrical Practice Test

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What is the primary function of the blower relay in an A/C system?

To control the compressor operation
To manage the airflow from the blower motor
To limit the temperature of the refrigerant
To activate the condenser fan

The correct answer is: To manage the airflow from the blower motor

The primary function of the blower relay in an A/C system is to manage the airflow from the blower motor. The blower relay acts as a switch that regulates the electrical power delivered to the blower motor. When the air conditioning system is activated, the blower relay receives a signal, allowing the blower motor to run at the appropriate speed that is necessary for optimal airflow through the evaporator coil and throughout the living space. Proper airflow is crucial for the efficient operation of the A/C system, as it aids in maintaining the desired indoor temperature and contributes to the overall efficiency of heat exchange processes. By controlling the blower motor, the relay helps ensure that the system provides sufficient cooling without straining the components or using excessive energy.