At Fast Affordable Air, we work on all types of central AC and heating and cooling systems throughout Las Vegas, Henderson, and North Las Vegas. Today’s project highlights how we diagnosed and repaired an air conditioner that wasn’t cooling properly.
Step 1: Temperature Readings
We began by checking the air coming out of the supply vent compared to the return vent. Using an infrared thermometer, the supply vent was measured at 72.1°F, while the return vent was pulling in air at 86.5°F. The difference between supply and return air is called the temperature split. For most systems, a healthy split is around 16–22°F. This system showed about a 14°F difference, which is on the low side and can mean reduced efficiency.
Step 2: Inspecting the Capacitor
Next, we inspected the dual-run capacitor inside the outdoor condenser. This part stores and releases energy to start and run the compressor and fan motor. The capacitor in this system was rated at 40 + 5 µF, 440 VAC. A weak or failing capacitor often leads to hard starts or the outdoor fan not running properly. Replacing it with a correct-rated part ensures reliable operation.
Step 3: Refrigerant Pressure Readings
We connected our Fieldpiece digital manifold to measure refrigerant pressures and temperatures. On the R-22 system, pressures were recorded at 266.4 psi low side and 312.9 psi high side. On a separate R-410A system check, we saw 150.7 psi low side and 365.8 psi high side. These readings, along with superheat (SH) and subcooling (SC) values, tell us if the system is properly charged. For example, the R-410A unit showed 6.6°F subcooling, which is within typical range, meaning refrigerant levels are balanced.
Step 4: Wiring and Connections
We inspected the electrical compartment and capacitor wiring for signs of heat damage or loose terminals. Clean, tight, and properly insulated wiring ensures the air conditioner runs safely and efficiently.
Benefits of the Repair
- Better Cooling: By addressing refrigerant balance and electrical issues, the system pushes colder air into the home.
- Energy Savings: A properly charged AC doesn’t overwork, which lowers energy bills.
- Longer Lifespan: Preventing stress on the compressor and motors extends equipment life.
- Peace of Mind: Homeowners don’t have to worry about sudden breakdowns during hot Las Vegas summers.
If you’d like to see more about how our technicians repair and maintain systems, visit the Air Conditioning Repair page or the Maintenance page on our website.
