Gas Fitter Practice Test

If an air conditioning system is added to a heating system, what is recommended?

1. A smaller blower pulley be installed

2. A larger blower pulley be installed

3. A larger motor pulley be installed

4. A smaller motor pulley be installed

The correct answer is: A larger motor pulley be installed

When adding an air conditioning system to an existing heating system, it is generally recommended to install a larger motor pulley. The reason for this recommendation is based on the need for appropriate airflow and cooling capacity for the air conditioning unit. In heating systems, blower operation is optimized for delivering warm air, which may involve different air volume and pressure requirements compared to cooling systems. By installing a larger motor pulley, the blower will run at a lower RPM (revolutions per minute), allowing for increased airflow needed for efficient cooling. This adjustment ensures that the air conditioning system can effectively circulate cool air throughout the space, improving comfort levels and system performance. The other options would not effectively address the need for increased airflow. For instance, a smaller blower or motor pulley would restrict airflow, which could lead to inefficiencies and insufficient cooling. Therefore, installing a larger motor pulley is a crucial step in maintaining optimal performance when integrating a new air conditioning system with an existing heating system.