1B-12 AIR CONDITIONING Do not use the same vacuum pump for evacuating the R-134a and R-12 systems interchangeably (The vacuum pump hose fitting is a M10X1.5). R-134a vacuum pumps must have a positive shut- off valve. N1A0061E Refrigerant Leak Inspection The flame type gas leak detector for the R-12 sys- tem cannot be used with the R-134a system. N1A0060E The electric leak detector for the R-12 cannot be used with the R-134a system as the R-134a parti- cles are far smaller than the R-12 molecules and, therefore, may not be always detected. Use leak detectors designed exclusively for the R-134a sys- tem. Legend 1. M10 Ч 1.5 (Hose fitting) Caution:
Never use the same vacuum pump for both R-134a and R-12 systems, as cross contamination of compressor oil may occur. Precautions for Replacement or Repair of R-134a Air Conditioning Parts There are certain procedure, practices and precautions that should be followed when servicing air conditioning systems: Refrigerant Recovery, Recycling and Charging Avoid releasing the R-134a into the atmosphere. Use the ACR 4 (R-134a Refrigerant Recovery/ Re- cycling/ Recharging/ System) or equivalent to re- cover and recycle R-134a. Note that the ACR 4 (or equivalent) is not interchangeable between the R 134a and R-12 systems. ACR 4 (115V 60Hz): 5-8840-0629-0 (J-39500-A) ACR 4 (220-240V 50/60Hz):
5-8840-0630-0 (J- 39500-220A) ACR 4 (220-240V 50/60Hz Australian model): 5- 8840-0631-0 (J-39500-220ANZ) Keep your work area clean. Always wear safety goggle and protective gloves when working on refrigerant systems. Beware of the danger of carbon monoxide fumes caused by running the engine. Beware of discharged refrigerant in enclosed or im- properly ventilated garages. Always disconnect the negative battery cable and discharge and recover the refrigerant whenever re- pairing the air conditioning system. When discharging and recovering the refrigerant, do not allow refrigerant to discharge too fast; it will draw compressor oil out of the system.
Keep moisture and contaminants out of the sys- tem. When disconnecting or removing any lines or parts, use plugs or caps to close the fittings imme- diately. Never remove the caps or plugs until the lines or parts are reconnected or installed. When disconnecting or reconnecting the lines, use two wrenches to support the line fitting, to prevent from twisting or other damage.