Charging Procedures

Display Shows Complete Evacuation/Charging:

Unsuccessful Transfer (Check Refrigerant):

CHARGING

IMPORTANT:


- The A/C system must be evacuated prior to charging.

- Check that the "Lbs/Kg" switch on the back of the unit. It must be 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. The unit must be in the program mode.

4. Enter the amount of refrigerant to charge the A/C system by pressing the appropriate number keys. Use correct unit of weight (Lbs. or Kg.).

5. Press "ENTER."

- A blink of the display indicates the charge amount is in the unit's 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" (figure 35).


IMPORTANT: If the transfer of refrigerant stops before complete, refer to "Unsuccessful Transfer."


Successful Transfer Complete

1. Close the high side valve on the unit's control panel. (Both valves should be closed.)

2. Start the vehicle and the A/C system. Let the engine run until the readings on the high side and low side gages stabilize. Compare readings to system specifications.

3. Check the evaporator outlet temperature to be sure the AC system is operating to system specifications.

4. With the A/C system running, close the high side coupler valve and disconnect the high side (Red) hose from the vehicle.

5. Open both the high side and low side valves on the control panel.

6. Refrigerant from both hoses will be drawn quickly in to the A/C system through the low side (Blue) hose.

7. 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's 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. Continue with Step 1 under "Successful Transfer Complete."

2. If the transfer will not complete and the display shows "CHECK REFRIGERANT" (figure 36), 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 AC system and another complete evacuation and charge procedure.

A. Press "HOLD/CONT" on the keypad to interrupt the cycle.

B. Press "RESET" to reset the unit.

C. Recover the refrigerant that has been charged into the system, refer to "Refrigerant Recovery."

3. Add refrigerant to the tank following the manufacturer's instructions. Refer to Step 1 under "Evacuation."