REFRIGERANT(for HFO-1234yf(R1234yf)) REPLACEMENT

PROCEDURE


  1. RECOVER REFRIGERANT FROM REFRIGERATION SYSTEM


    1. Start the engine.

    2. Operate the cooler compressor under the conditions shown below:

      Item Condition
      Engine Speed Idling
      Operating Time 3 minutes or more
      A/C Switch Status On
      Blower Switch Status HI
      Set Temperature MAX COOL

      This causes most of the compressor oil from the various components of the A/C system to collect in the A/C compressor.

      Note

      It is not necessary to operate the cooler compressor if the A/C does not operate because of compressor lock, etc.

    3. Stop the engine.

    4. Recover the refrigerant from the A/C system using a refrigerant recovery unit.

      Note

      Be sure to use a refrigerant recovery unit that is compatible with HFO-1234yf (R1234yf) systems.

      Tech Tips

      Use the refrigerant recovery unit in accordance with the manufacturer's instruction manual.

  2. CHARGE REFRIGERANT

    Tech Tips

    Charge refrigerant in accordance with the equipment manual.


    1. Perform vacuum purging using a refrigerant recover unit.

      Note

      Be sure to use a refrigerant recovery unit that is compatible with HFO-1234yf (R1234yf) systems.

    2. Charge refrigerant HFO-1234yf (R1234yf).

      Standard
      350 +/-30 g (12.3 +/-1.1 oz)

      Note

      Make sure the amount of refrigerant is within 30 g of the specified amount.

      A004HIPE22
      Text in Illustration
      *a Amount to be charged *b Mean value in proper range
      *c Overcharged *d Pressure
      *e Sub-cool system *f Refrigerant amount

      Note

      Do not operate the cooler compressor before charging refrigerant as the cooler compressor will not work properly without any refrigerant, and will overheat.

  3. WARM UP ENGINE


    1. Warm up the engine at less than 2000 rpm for 2 minutes or more after charging the refrigerant.

      Note

      Be sure to warm up the compressor by turning the A/C switch on after removing and installing the cooler refrigerant lines (including the compressor) to prevent damage to the compressor.

  4. CHECK FOR REFRIGERANT GAS LEAK


    1. After recharging the refrigerant, check for refrigerant gas leakage using a gas leak detector.

      Tech Tips

      Be sure to use a gas leak detector that is compatible with HFO-1234yf (R1234yf) systems.


      1. Perform the operation observing the following instructions:


        • Stop the engine.

        • Secure good ventilation (the gas leak detector may react to volatile gases other than refrigerant, such as evaporated gasoline or exhaust gas).

        • Repeat the test 2 or 3 times.

        • Make sure that some refrigerant remains in the refrigeration system.

          Tech Tips

          When the compressor is off: approximately 392 to 588 kPa (4.0 to 6.0 kgf/cm2, 57 to 85 psi).

      2. A004K3RE01
        Text in Illustration
        *1 Gas Leak Detector
        *a Check for Leakage

        Using a gas leak detector, check the refrigerant line for leakage.

      3. If a gas leak is not detected from the drain hose, remove the blower motor control (blower resistor) from the cooling unit. Insert the sensor of the gas leak detector into the unit and check for gas leakage.

      4. Disconnect the pressure switch connector and wait for approximately 20 minutes. Bring the gas leak detector close to the pressure switch and check for gas leakage.