• License# CR110184

  • One of the most important things you can do for your customers is to ensure that their refrigerant system is working properly. Of all the things that can go wrong with an air conditioners refrigerant system, the most common is undercharge. A study commissioned by Arizona Public Service, an Arizona utility, found that more than 70% of split systems tested were at least 5% low on refrigerant. As you know, low refrigerant charge impacts compressor reliability, as well as efficiency and performance. Im sorry to tell you this, but even if you have proper pressure charts for a system, you cant tell if a system is charged properly in mild weather. In fact, if you charge a system up to the pressures listed on the systems pressure chart at 95 degrees Farenheit ambient, you can easily be 20% low on charge. If you charge at temperatures below 95 degrees, the problem is exaggerated. Heres some more bad news; youd better sit down for this one. The temperature split does not tell you if a system is working properly, especially in mild weather. The good news is that on most systems we work on, there is an accurate way to evaluate the refrigerant charge during any kind of weather: superheat.