Evacuation and Charging

R-134a A/C Service Center:

R-134a A/C Mobile Recycling Center:

4 CFM Vacuum Pump:

Special Tools

PROCEDURE
1. Prior to recovering or charging the refrigerant system, you must verify the purity of the refrigerant.





2. Connect a R-134a A/C Service Center or a R-134a Mobile Recycling Center to the low- and high-pressure service gauge port valves.
3. Recover the refrigerant from the system following the operating instructions provided by the equipment manufacturer.
4. Perform the required service operations to the A/C refrigerant system.
5. Evacuate the system until the low-pressure gauge reads at least 99.4 kPa (29.5 in-Hg) (vacuum) and as close to 101.1 kPa (30 in-Hg) as possible. Continue to operate the vacuum pump for a minimum of 45 minutes.

NOTE: An A/C Manifold Gauge Set and Vacuum Pump may also be used to evacuate the system.

6. Turn off the evacuation pump. Observe the low-pressure gauge for five minutes to make sure that the system vacuum is held. If vacuum is not held for five minutes, leak-test the system, service the leaks, and evacuate the system again.
7. Properly oil match the system to verify that the correct amount of refrigerant oil is present in the system.
8. Charge the system with the specified weight of refrigerant and refrigerant oil.

NOTE: An A/C Manifold Gauge Set and charging cylinder may also be used to charge the system.





9. When no more refrigerant is being drawn into the system, start the engine and press the override button for MAX A/C operation. Rotate the blower motor speed control fully up and allow the remaining refrigerant to be drawn into the system. Continue to add refrigerant into the system until the specified weight of R-134a has been added. Close the charging cylinder valve and allow the system to pull any remaining refrigerant from the hose. When the suction pressure drops to approximately 207 kPa (30 psi), close the charging hose valve.