HVAC SYSTEM-AC COMPRESSOR 158 C PRECAUTIONS WHILE HANDLING R134A SHOULD BE OBSERVED AT ALL TIMES:- WARNING: a. Do not allow a refrigerant container to be heated by a direct flame or to be placed near any heating appliance. A refrigerant container must not be heated above 50° C. b. Do not leave a container of refrigerant without its cap fitted. Do not transport a container of refrigerant that is unrestrained, especially in the boot of a car. 1. R134a is a hazardous gas and when handled in-correctly can cause serious injury. Suitable pro- tective clothing must be worn when carrying out servicing operations on the air conditioning sys- tem. NOTE: Suitable protective clothing comprises: Wrap around safety glasses or helmet, heatproof gloves, rubber apron or waterproof overalls and rubber boots. 2. R134a is odorless and colorless. Do not handle or discharge in an enclosed area, or in any area where the vapour or liquid can come in contact with naked flame or hot metal. R134a is inflam- Mable, but can form a highly toxic gas so always work in a well-ventilated area. 3. Do not smoke or weld in areas where R134a is in use. Inhalation of concentrations of the vapour can cause dizziness, disorientation, narcosis, nausea or vomiting. 4. Do not allow fluids other than R134a or compressor lubricant to enter the air conditioning system. Spontaneous combustion may occur. 5. R134a splashed on any part of the body will cause immediate freezing of that area. Also refrigerant cylinders and replenishment trolleys when discharging will freeze skin to them if contact is made. 6. The refrigerant used in an air conditioning system must be reclaimed in accordance with the recommendations given with a Refrigerant Recovery Recycling Recharging Station. 7. Care should be taken when discharging the air conditioning system to ensure the refrigerant is not released to the atmosphere but captured for recycling. Refrigerant R134a is transparent and colorless in both the gaseous and liquid states. At all normal temperatures and pressures it will be a vapour. Also R134a is inflammable, nonex- plosive, nonpoisonous and noncorrosive (ex- cept when in contact with moisture). 8. Do not weld or steam clean on or near any air condi- tioning components when pressurized. This may cause a dangerous pressure build up in the system. 9. When purging a system, discharge the refrigerant slowly. 10. Refrigerant cylinders should always be protected from the radiant heat of the sun and keep in a cool place. 11. When filling a refrigerant cylinder, never completely fill it. Always leave space for expansion. If the cylinder was completely filled and the temperatures increases, the hydraulic pressure with its tremendous force would resulting to cylinder bursting accidents. 12. Never discharge a system or do brazing / welding/ operation when the main engine is ‘ON’. 13. Do not drop, dent or abuse refrigerant gas cylinders. 14. Always chain or strap cylinders in place to prevent them from tripping over or damage, from moving around. 15. Always keep refrigerant cylinders capped. 16. Never heat a cylinder with open flame or place electric heater in direct contact. 17. Always double check that you have proper refrigerant container. The refrigerant cylinders are color coded to avoid confusion. (R134a is gener- ally BLUE). 18. Use proper size spanners, wrenches to avoid damages to valve and threads. 19. 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. 20. When filling a refrigerant cylinder, never completely fill it. Always leave space for expansion. If the cylinder was completely filled and the temperatures increases, the hydraulic pressure with its tremendous force would resulting to cylinder bursting accidents. 21. Never discharge a system or do brazing / welding/ operation when the main engine is ON.
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