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Charging A/C System

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NOTE: Ensure LB/KG switch on the back of the ACR4 unit is set for desired refrigerant measurement unit (pounds or kilograms). Operate switch with main power off.
  1. Ensure engine is off. With ACR4 connected (from evacuation procedure), close low-side valve on ACR4 control panel. Open high-side valve on ACR4 control panel. Press CHG button and enter amount of refrigerant charge specified. When entering amount of refrigerant, ensure correct unit of weight is used. See REFRIGERANT OIL & REFRIGERANT CAPACITY SPECIFICATIONS  for system capacities.
  2. After entering specified amount of refrigerant, press ENTER button. Display will blink indicating charge amount is in ACR4 memory. Press CHG button to begin charging process. ACR4 will display AUTOMATIC and show amount of refrigerant programmed for charging. Display will count down to zero until CPL is displayed indicating process is completed. If charging process is successful, go to next step. If charging process stops before system charge is complete, go to step 5).
  3. Close ACR4 high-side valve on control panel (both valves should be closed). Start engine, turn A/C system on and run until high-side and low-side gauges stabilize. Ensure high-side and low-side pressures are within specification. Ensure evaporator outlet temperatures are within specifications.
  4. With A/C running, close high-side coupler valve and disconnect high-side hose from vehicle. Open both high-side and low-side valves on ACR4 control panel. Refrigerant from both hoses will be drawn into A/C system through low-side hose. Close low-side coupler valve and disconnect from vehicle. Ensure proper A/C system operation.
  5. Charging process will stop before system charge is complete. If refrigerant tank pressure and A/C system pressure are about the same, ACR4 will emit an audible signal and display amount of refrigerant remaining to be transferred. If this occurs, go to next step. If charging process will not complete and CHECK REFRIGERANT is displayed, there is not enough refrigerant to complete process. If this occurs, go to step 7).
  6. Close high-side valve and open low-side valve. With engine running, start A/C system and press HOLD/CONT button. Reminder of refrigerant should go into A/C system. When charging process is complete, go to step 3).
  7. Press HOLD/CONT button to interrupt cycle. Press RESET button to reset ACR4. Recover refrigerant that has been charged into system. Fill refrigerant tank, evacuate and charge A/C system. See EVACUATING A/C SYSTEM  and CHARGING A/C SYSTEM. Perform leak test procedure. See LEAK TESTING  .
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