Three valve gauge

Note:

• Only use a gauge set for refrigerant R134a.
• use a vacuum pump adapter which is equipped with a check valve to prevent the backflow of the vacuum pump oil.

WARNING: When handling refrigerant (R134a) observe all safety precautions, see R134a general precautions.

1. Close the evacuation valve (two valve gauge; evacuation stop valve)
2. Open the cans
3. Open the high pressure valve to charge the system to about 100kPa (1.0kg/cm², 14 psi), then close it.

Note: close the low pressure valve.

4. Check the system for leaks using a leak detector suitable for refrigerant R134a.

Note: Check for leaks, particularly around the compressor, condenser and the receiver/drier

5. If any leaks are found, tighten the joint nuts and bolts to the specified torque.
6. Recheck the system for leaks using a leak detector.
7. If leaks are found that require the system to be opened (to repair or replace hoses, fittings, etc.), release and charge in the system.
8. After checking and repairing leaks, the system must be evacuated, see System Evacuation.

THREE VALVE GAUGE

1. A Evacuation valve
2. B High pressure valve
3. C Vacuum pump
4. D High pressure quick joint
5. E Low pressure quick joint
6. F Check valve
7. G Low pressure valve

TWO VALVE GAUGE

1. A High pressure valve
2. B Evacuation stop valve
3. C Vacuum pump
4. D High pressure quick joint
5. E Low pressure quick joint
6. F Check valve
7. G Low pressure valve