NANO

HVAC SYSTEM-AC COMPRESSOR 159 22. Do not drop, dent or abuse refrigerant gas cylinders. 23. Always chain or strap cylinders in place to prevent them from tripping over or damage, from moving around. 24. Always keep refrigerant cylinders capped. 25. Never heat a cylinder with open flame or place electric heater in direct contact. 26. Always double check that you have proper refrigerant container. The refrigerant cylinders are color coded to avoid confusion. (R 134a is gener- ally BLUE). 27. Use proper size spanners, wrenches to avoid damages to valve and threads. 28. Never use oxygen for pressure testing a system. It may explode in presence of oil. Instead use nitrogen from a cylinder equipped with proper pressure regulator.