A/C System Charge

Review safety precautions and warnings before charging the refrigerant system.
After the system has been tested for leaks and evacuated, a refrigerant charge can be injected into the system.

CAUTION: Do not over charge refrigerant system, as excessive compressor head pressure can cause noise and system failure.

1. Connect manifold gauge set.
2. Measure refrigerant (refer to capacities) and heat to 52 °C (125 °F) with the charging station. Refer to the instructions provided with the equipment being used. The proper charge is 1.75 lbs. (28 oz.).
3. Open the low and high side valves. Open the charge valve to allow the heated refrigerant to flow into the system. When the transfer of refrigerant has stopped, close the suction and discharge valve.
4. If all of the refrigerant charge did not transfer from the dispensing device, start engine and hold at idle (1,500 RPM). Set the A/C control to A/C, low blower speed and open windows. If the A/C compressor does not engage, test the compressor clutch control circuit and correct any failure.
5. Open the low side valve to allow the remaining refrigerant to transfer to the system.

WARNING: Take care not to open the discharge (HIGH-PRESSURE) valve at this time.

6. Close all valves and test the A/C system performance.
A/C Performance Testing

7. Disconnect the charging station or manifold gauge set. Install the service port caps.