Charging the Refrigerant System

Charging the A/C System (Engine Off)

Important
^ The A/C system must be evacuated prior to charging.
^ Check that the "LB/KG" switch on the back of the unit to be sure it is set for the desired units of weight system (operate switch with main power "OFF").

1. Close the low-side valve on the control panel.
2. Open the high-side valve on the control panel.
3. Press "CHG" on the keypad to be sure the unit is in the program mode.
4. Enter the amount of refrigerant charge to charge the A/C system by pressing the appropriate number keys. Be sure to use correct unit of weight (pounds or Kg).

Important
^ Charge A/C system with amounts of R-134a specified. Do not overcharge.
^ Charge A/C system (All) with 0.91 kg (2.0 pounds).

5. Press "ENTER."
^ A blink of the display indicates the charge amount is in the unit memory.
6. Press "CHG" on the keyboard to begin the charging process.
7. The display shows "AUTOMATIC" and the amount of refrigerant programmed for charging.
^ The display counts down to zero as the charging process proceeds.
^ At the end of the process, the display shows "CPL."

Important
^ If the transfer of refrigerant stops before complete. Refer to "Unsuccessful Transfer" that follows.

Successful Transfer Complete

1. Close the high-side valve on the unit control panel (both valves should now be closed).
2. Start the vehicle and the A/C system and let run until the readings on the high-side and low-side gages stabilize. Compare readings, outlet temperatures and ambient temperature and humidity to "A/C Performance Chart".
3. With the A/C system running, close the high-side coupler valve and disconnect the high-side (red) hose from the vehicle.
4. Open both the high-side and low-side valves on the control panel.
5. Refrigerant from both hoses will be drawn quickly into the A/C system through the low-side (blue) hose.
6. Close the low-side coupler valve and disconnect from the vehicle.

Unsuccessful Transfer

On rare occasions, the total charge does not transfer to the vehicle A/C system. There are two reasons why this can occur.

1. If the transfer is too slow because the pressure in the unit tank and the vehicle A/C system are about the same, the unit will emit an audible signal and the display shows the weight remaining for transfer. In this case:
A. Close the high-side valve.
B. Open the low-side valve.
C. Start the vehicle A/C system, and press "HOLD/CONT" on the keyboard. This will put the remainder of the charge into the A/C system.
D. Continue with the previous procedure, "Successful Transfer Complete."
2. If the transfer will not complete and the display shows "CHECK REFRIGERANT" there is not enough refrigerant in the tank to complete the process. This condition requires the recovery of the partial charge of refrigerant in the vehicle A/C system and another complete evacuation and charge procedure.
A. Press "HOLD/CONT" on the keypad to interrupt the cycle.
B. Press "RESET" to reset this unit.
C. Recover the refrigerant that has been charged into the system.
3. Add refrigerant to the tank following the manufacturer instructions.