ii. RECOVERY AND RECYCLING The following procedure is usual for the use of Refrigerant Recovery, Recycling and Recharging station or Refrigerant Recovery Unit (RRU) when recovering refrigerant from a car air conditioning system. 1. Connect a Refrigerant Station to the high and low pressure servicing connections located inside hood. 2. Operate the refrigerant recovery system according to the manufacturer’s instructions and recover the refrigerant and oil from the vehicle. 3. Measure the amount of oil discharged from the system. Add an equal amount of new refrigerant oil before evacuation operation. R134a Refrigerant Recovery Recycling Recharging Station must not be used with any other type of refrigerant. iii. EVACUATION AND RECHARGING 1. Add refrigerant oil as per the table given in “Replenishing Compressor Oil” procedure in the same section. Evacuate the system according to the • manufacturer’s instructions 2. Recharge the refrigerant as per instructions. Refrigerant to be charged in the system is 500±20 gms. 3. If the full charge has not been accepted by the system, start the engine and run it at 1500 rpm for a minimum of 2 minutes. Switch ON the air conditioning system, open the vehicle windows, set the temperature control to full cold and run the blower at maximum speed. 4. Consult Refrigerant Station Manual for correct procedure to complete the charge. 5. Carry out the air conditioning system performance test. CAUTION Refrigerant must always be recycled before • reuse, to ensure that the purity of the refrigerant is high enough for safe use in the air conditioning system. NOTE If the vacuum reading is below 700mmHg • after 15 minutes, suspect a leak in the system. Partially recharge the system and check for leaks by using leak detector. Check suction lines first, then run the compressor for 5 minutes and then check the high pressure lines. CAUTION The system must be evacuated immediately • before recharging commences. Delay between Evacuation and Recharging is not permitted. NOTE When charging refrigerant only without • replacing any component, replenish the same amount of measured oil when recovering refrigerant (if not measured, replenish 30cc oil). HVAC W/O ETC 35
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