Refrigerant Drum Method

Charging The System:

Tools Required:

- J 23575-01 Manifold Gage Set

- J 23390 Refrigerant Dispensing 'valve

If the Refrigerant-12 drum is used, place It on a scale and note the total drum weight before charging. Watch the scale during charging to determine the amount of R-12 used (see accompanying figure).

1. Connect manifold gage set as follows:

a. Low-pressure gage to accumulator fitting.

lo. Gage set center hose to R-12 source.

C. High-pressure gage to vacuum pump.

2. To begin evacuation, hook-up the manifold gage set and vacuum pump as shown, Slowly open the high-side and low-side gage valves and start the vacuum pump. Pump the system until the low side gage reaches 711.2--736.6 kPa (28"-29") vacuum. If the prescribed vacuum cannot be reached, close the vacuum control valve and turn off the pump. Look for a leak at the connections m the pump.

3. When the gage reaches the prescribed vacuum, the system is fully evacuated. Close the high side gage set valve and turn off the vacuum pump.

4. Watch the low-side gage to be sure vacuum holds for 5 minutes. If vacuum holds, disconnect the vacuum hose at the gage set. Then, proceed with charging the system.

5. If vacuum does not hold for 5 minutes, charge the system with 0.227 Kg (1/2 lb.) of R-12 and check for leaks. Discharge the system again and repair any leaks.

6. Repeat the evacuation procedure.


CHARGING
1. Move the A/C mode control lever to "OFF." Start the engine and run until the engine is at normal operating temperature.

2. With the R-12 drum inverted. open the R-12 source valve(s). Allow 0.453 Kg (1 lb.) of liquid R-12 to flow into the system through the low-side service fitting on the accumulator.

3. As soon as 0.453 Kg (1 lb.) of R-12 has been added to the system. engage the compressor by setting the A/C mode lever to "NORM" and the blower speed lever to "HI" to draw in the rest of the R-12 charge.

- To speed up the charging operation, a large-volume fan can be used to pass air over the condenser. If the condenser temperature remains below the charging cylinder temperature, Refrigerant-12 will enter the system more rapidly.

4. Turn off the R-12 source valve. Run the engine for 30 seconds to clear lines and gages.

5. With the engine running. remove the low-side charging hose adapter from the accumulator service fitting. Unscrew it rapidly to avoid excessive R-12 loss from the system.


CAUTION: Never remove a gage line from its adapter when the line is connected to the A/C system. Always remove the line adapter from the service fining to disconnect a line. Do not remove the charging hose at the gage set while it is attached to the accumulator. This will result in the system being completely discharged, because the Schrader-type valve in the low-side service fitting is fully depressed. Complete discharge may cause personal injury due to escaping Refrigerant-12.


6. Replace the protective cap on the accumulator fitting.

7. Turn the engine off.

8. Check the system for leaks with a J 38505 Autobalance Refrigerant Leak Detector.

9. Start the engine.

10. With the system fully charged and checked for leaks, make a system performance check.