AIR CONDITIONING 32 11.12 DISCHARGING THE SYSTEM REFRIGERANT RECOVERY Various Refrigerant Recovery Units (RRU ) are now available. The following procedure is typical for the use of these units when recovering refrigerant from a car air conditioning system. 1. Connect the RRU outlet to an R 134 a recovery cylinder with a refrigerant hose and open the valve on the cylinder. Ensure that the cylinder has sufficient capacity to hold the refrigerant in the system to be serviced. This can be confirmed by weighing the cylinder or by referring to the volume gauge if fitted. 2. Connect a gauge manifold set to the car air conditioner. Connect to both the suction and discharge sides of the system. Connect the centre hose of the gauge set to the inlet of the recovery unit. Connect the RRU to electrical supply. 3. Open the gauge set and quickly connects stop taps to allow refrigerant to enter the RRU via the centre hose. At this point, depending on which unit is being used, the RRU will switch on. If the RRU is not the automated type, which the unit on. 4. The automatic recovery unit will operate until the air conditioning system has been emptied of refrigerant down to atmosphere pressure. The cylinder can now be closed. 5. Measure the amount of PAG (Poly Alkaline Glycol) or equivalent oil removed from the A/C system. This oil is normally separated from the incoming refrigerant into the RRU. New clean PAG oil must be added into the system before recharging with refrigerant.
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