NANO

832 HVAC GENERAL PRECAUTIONS The refrigerant used in the air conditioning system is HFC (Hydro fluorocarbon) R134a. Its global warming potential is very much lower than that of R12 refrigerant. The details of the refrigerant are given below: 1 Specifications Tetra flouroethane (CF3-CH2F) 2 Oil ATOMOS GU10,110 / Equivalant 3 Form Gas 4 Color Colorless 5 Smell Slightly of ether 6 Crystallization -117°C temperature 7 Boiling temperature -26°C The following precautions in handling R134a should be observed at all times: 1. While carrying out service operations on the air conditioning system, suitable protective clothing must be worn. Mis-handling may cause serious injury. NOTE: Suitable protective clothing comprises: Wrap around safety glasses or helmet, heatproof gloves, rubber apronor 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 wi th naked f lame or hot metal . R134a is inflammable, 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 al low f luids 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, nonexplosive, nonpoisonous and noncorrosive (except when in contact with moisture). 8. Do not weld or steam clean on or near any air conditioning 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 & keep in a cool place. 11. When filling a refrigerant cylinder, never completely fill it. Always leave space for expansion. If the cyl inder was completely f i l led 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. (R 134a is generally BLUE) 18. Use proper size spanners, wrenches to avoid damages to valve & 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.