Troubleshooting Challenge: An A/C System That’s Not Keeping the House Comfortable
When you arrive, you find the following conditions:
• The indoor temperature is near 85°F.
• The thermostat setpoint is 70°.
• The indoor fan motor is running normally, and you determine that the indoor airflow is sufficient.
When you go to the condensing unit to continue your evaluation, you find that the outdoor fan motor and compressor are operating on this R-22 system and, after confirming proper airflow through the condenser coil, you measure an ambient temperature of 90°. When you connect your gauges to the high and low side access valves, you read the following pressures:
• Low-side pressure: 90 psig.
• High-side pressure: 170 psig.
To complete your diagnosis, you apply the pressure readings to the temperature scales on your gauge set (click here for a PDF of a pressure/temperature chart) and you also measure the current draw of the compressor as lower than normal.
Your troubleshooting question: What is the specific failure that is preventing this system from cooling properly?
Compare your answer with ours by clicking on the PDF link below.
Publication date: 05/07/2012