Residential HVAC Installation Practice Exam

What does adjusting the tension on the belt in a system affect?

1. The airflow pressure

2. The temperature of the conditioned air

3. The amperage draw of the motor

4. The size of the ductwork

The correct answer is: The amperage draw of the motor

Adjusting the tension on the belt in an HVAC system affects the amperage draw of the motor. The tension on the belt is crucial for maintaining the proper connection between the motor and the fan or compressor. If the belt is too loose, it may slip, causing the motor to work harder and draw more amperage. Conversely, if the belt is too tight, it can strain the motor bearings, leading to increased amperage draw as well. Therefore, ensuring the correct tension on the belt can help optimize the motor's performance and prevent unnecessary energy consumption. Regarding the other options: - A. The airflow pressure can be affected by factors such as the fan speed or duct design, but adjusting the tension on the belt specifically affects the amperage draw of the motor. - B. The temperature of the conditioned air is typically controlled by the thermostat setting and the performance of the refrigeration cycle, not the tension on the belt. - D. The size of the ductwork is related to the system's design and airflow distribution but is not directly impacted by adjusting the tension on the belt.