What this book covers The Peerless Warm Air Heating & Air Conditioning (C-20) Study Guide Book prepares you for the trade portion of the California CSLB contractor license exam. Per the state's classification, a C-20 contractor installs, services, and repairs forced-air heating, ventilating, and air conditioning systems, including ductwork, equipment, and refrigeration components. This printed book covers the subjects the state tests. See the official CSLB C20 classification. Book chapters Evaluation, design & estimation Fabrication, installation & startup Troubleshooting, repair & maintenance Safety Tools & instruments Sample questions In 1 ton of air conditioning there are how many Btu's per hour?A. 10,000 · B. 11,000 · C. 12,000 ✓ · D. 15,000 Two methods of evacuation are:A. Deep and purging · B. Deep and vapor · C. Deep and triple ✓ · D. Deep and surface The mechanism that comprises both a service valve and a pressure gauge is a:A. Selenium · B. Charging pulse · C. Testing manifold ✓ · D. Transformer
