At Fast Affordable Air, our licensed HVAC technicians handle everything from small electrical fixes to full system replacements. In this project, we were called out to service a central air conditioning system that wasn’t cooling properly. The inspection uncovered issues with electrical capacitors, refrigerant pressures, and wiring that needed attention.
Step 1: System Diagnostics
We began by connecting our refrigerant gauge manifold to the system (see photo of gauges). This tool measures the high and low pressure sides of the AC’s refrigerant cycle. For this unit, which runs on R-22 refrigerant, the pressures told us that the compressor was under strain and not running efficiently.
Step 2: Electrical Inspection
Next, we checked the capacitors. A capacitor is like a small battery that stores energy to help the compressor and fan motor start up and keep running. Over time, capacitors can weaken or fail completely. Several of the capacitors in this system were swollen, rusted, and leaking, which is a clear sign of failure.
We also used a multimeter to measure electrical flow. The yellow meter reading showed the system was getting proper voltage (around 220V), but the capacitors were no longer holding the correct charge. For example, one capacitor rated at 45 µF (microfarads) was testing much lower than required. This mismatch prevents the compressor from starting reliably.
Step 3: Capacitor Replacement
After disconnecting power for safety, we carefully removed the old capacitors. The pictures show how the damaged capacitors were corroded, with loose or burnt connections. We replaced them with new, properly rated capacitors to restore safe and efficient operation.
Installing the correct capacitor ensures the air conditioner repair is reliable and prevents stress on the compressor, which is the most expensive part of the system.
Step 4: Performance Testing
With new capacitors installed, we reconnected the wiring and restored power. We then measured:
- Amperage Draw: Checked with the clamp meter to confirm the compressor was running within safe limits.
- Refrigerant Pressures: Verified using gauges to make sure the system was circulating refrigerant correctly.
- Temperature Drop: Confirmed cool supply air inside the home compared to the return air, showing the unit was cooling properly again.
Benefits of Proper Repairs
By replacing failing capacitors and ensuring the system runs at the right pressures, we help extend the life of the AC and prevent costly compressor failure. This kind of HVAC maintenance also improves energy efficiency, which means lower electricity bills for the homeowner.
Projects like this show why it’s important to keep up with professional inspections in Las Vegas, Henderson, and North Las Vegas, where extreme summer heat pushes cooling systems to their limits.
