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

PROCEDURE


  1. RECOVER REFRIGERANT FROM REFRIGERATION SYSTEM


    1. Turn the power switch on (READY).

    2. Turn the A/C switch on.

    3. 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 be collected in the A/C compressor.

      Tech Tips

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

    4. Turn the power switch off.

    5. 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 AIR CONDITIONING SYSTEM WITH 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 the air conditioning system with refrigerant.

      Refrigerant type
      HFO-1234yf (R1234yf)
      A005A1YE15
      Text in Illustration
      *a Standard charge amount *b Mean value in proper range
      *c Overcharged *d High pressure
      *e Sub-cool system *f Refrigerant amount
      Standard
      440 to 500 g (15.6 to 17.6 oz.)

      Note


      • Make sure the amount of refrigerant is within 30 g (1.05 oz.) of the specified amount.

      • 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 COMPRESSOR


    1. Keep the A/C switch on for at least 2 minutes to warm up the compressor.

      Note

      To prevent damage to the compressor, be sure to warm up the compressor when turning the air conditioning on after removing and installing air conditioning system lines (including the compressor).

  4. INSPECT FOR REFRIGERANT 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:


        • Power switch off.

        • Secure good ventilation (the gas leak detector may react to volatile gases which are not refrigerant, such as gasoline vapor and exhaust gas).

        • Repeat the inspection 2 or 3 times.

        • Measure the pressure to make sure that there is some refrigerant remaining in the air conditioning system.

          Pressure when the compressor is off: approx. 392 to 588 kPa (3.9 to 5.9 kgf/cm2, 57 to 85 psi)

      2. A005BMPE01
        Text in Illustration
        *1 Gas Leak Detector
        *a Inspect for Leak

        Using a gas leak detector, inspect for refrigerant leaks from the air conditioning system.

      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.