1. Phaseout Schedule for HCFCs
(HVAC & Energy Library/Residential Information)

What You Should Know about Refrigerants When Purchasing or Repairing a Residential A/C System or Heat Pump Background: Ban on Production and Imports of Ozone-Depleting Refrigerants In 1987 the ...

2. Service Clinic: TX Valve Basics
(HVAC & Energy Library/Technician Resource)

Refrigeration Basics: Optimizing System Performance Using a TXV By Al Maier The thermostatic expansion valve (TXV) is a precision device designed to regulate the rate at which liquid refrigerant ...

3. Service Clinic: The Art of Troubleshooting
(HVAC & Energy Library/Technician Resource)

...  First, let the system run for a few minutes (15 by most manufacturer's recommendations) and check the refrigerant level. Most of us are guilty of cranking the machine up, slapping our gauges on, grabbing ...

4. Service Clinic: Compressor Replacement After a Burnout
(HVAC & Energy Library/Technician Resource)

... system with refrigerant and oil per the equipment manufacturer’s recommendations. Finally, reconnect the electrical connections and test the system according to the manufacturer’s recommendations. Getting ...

5. Service Clinic: Mystery of Superheat
(HVAC & Energy Library/Technician Resource)

... for a given pressure. If heat is added to refrigerant when it’s a 100% saturated vapor, it will become superheated. To understand superheat, imagine a pressure cooker full of water and steam. As heat ...

6. Service Clinic: Subcooling & Superheat
(HVAC & Energy Library/Technician Resource)

... is low. What do you do? In too many cases, the answer is "add refrigerant." But doesn't it seem like a good idea to confirm that low refrigerant is the problem before you start adding refrigerant? That's ...

7. Technical Q&A
(Residential/Residential Clients)

... the ductwork. Putting a new system in a home that has not had central air and heat before will require the installation of ductwork, insulation, refrigerant piping, electrical service, wiring, thermostat, ...

8. Phasing out R22
(HVAC & Energy Library/Residential Information)

As of January 2010 the standard refrigerant used in most all residential HVAC systems, R-22 (freon), will no longer be allowed to be used when manufacturing new equipment. This government mandate came ...