Draining / Charging, R12

Measuring Pressure With The Robinair Smart Cart
1. Check that the cock on the blue low-pressure hose and the cock on the red high-pressure hose on the pressure gauge stand are both closed.

2. Connect the blue low-pressure hose to the low- pressure side of the compressor.

3. Connect the red high-pressure hose to the high-pressure side of the compressor.

4. Start the engine.

5. At engine speeds between 1500 and 2000 rpm and when air temperature is 20 °C (68 °F), it should be possible to read the following pressures on the pressure gauge when the compressor is working:
- Low-pressure side: 1-3 bar
- High-pressure side: 10.5-14.5 bar





Draining
Robinair Smart Cart and Robinair 17234 draining station.
1. Connect the blue low-pressure hose to the low- pressure side of the compressor.

2. Connect the red high-pressure hose to the high-pressure side of the compressor.

3. Using the yellow hose, connect the pressure gauge stand's middle outlet to the draining station.

4. Open the cocks on the blue low-pressure hose and the red high-pressure hose and the cock on the yellow hose connected to the pressure gauge stand's middle outlet.

5. Open the blue cock ("Liquid") for liquid refrigerant and the red cock ("Gas") for gaseous refrigerant on the draining station's container.

6. Start the draining station. When draining is completed, the draining station automatically switches off or the pressure gauge shows 0.

7. Close the cocks on the blue low-pressure hose, the red high-pressure hose and the yellow hose connected to the pressure gauge stand's middle outlet.

8. Remove the yellow hose from the draining station. Draining is now completed and work on the A/C system can commence.





Vacuum Pumping And Topping Up
Make sure that the amount of compressor oil in the A/C system is correct before starting vacuum pumping and charging. Refer to "Compressor Oil - Topping Up and Adjusting For R12".

1. Connect the blue low-pressure hose to the low-pressure side of the compressor.

2. Connect the red high-pressure hose,to the high-pressure side of the compressor.

3. Open the cocks on the blue low-pressure hose and red high-pressure hose on the pressure gauge stand.

4. Open the blue cock ("Liquid") for liquid refrigerant on the container on the Smart Cart.

5. Check that the cock on the yellow hose on the pressure gauge stand's middle outlet is closed.





6. Program vacuum pumping for 30 minutes by pressing "30" on the control panel in the "Vacuum minutes" position. Acknowledge the selection by pressing "ENTER".

7. Press "REV. PROG".

8. Enter "1.10" to specify the number of kilogrammes of refrigerant to be charged. Acknowledge the selection by pressing "ENTER".

9. Press "REV. PROG".

10. Press "START" to start vacuum pumping.

11. When vacuum pumping is completed, pressure should be below 10 m bar.


12. Move the A/C hoses slightly and make sure that there are no leaks in the system.

The pressure must not increase by more than 10 mbar in 5 minutes.





13. Close the cock to the blue low pressure hose on the pressure gauge.

14. Press "START" to start charging of refrigerant.

15. Stop the charging process by pressing "HOLD" when about 200 grammes of refrigerant has been filled.

16. Move the A/C hoses slightly and check that the system is not leaking using a leakage detector for R12.

17. Continue the charging process by pressing "START". When charging is complete, the display on the control panel shows "CPL".

18. Close the cock to the red high-pressure hose to the pressure gauge.

19. Start the car and wait until the compressor starts working. Pressure on the low-pressure side should be between 1.0 - 3.0 bar and check that the radiator fan switches on between 10.5 - 14.5 on high-pressure side.

20. Remove the connections 6n the compressor and refit the protective plugs over the service valves.