In this month’s troubleshooting situation, the customer hasn’t called because their HVAC system has stopped cooling. You’re there because they’ve requested a preventive maintenance check of the five-year-old equipment to determine if there are any potential problems that would affect the system performance in the future.
In addition to checking temperature splits and airflow, you are also checking the condition of the system’s electrical components. In the process of checking the dual run capacitor (see the partial diagram in Figure 1), you use your digital ammeter while the compressor is operating to make tests that show the following results: