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

PROCEDURE

  1. RECOVER REFRIGERANT FROM REFRIGERATION SYSTEM

    1. Turn the power switch on (READY).

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

      Item

      Condition

      Operating time

      3 minutes or more

      Temperature setting

      Max cool

      Blower speed

      High

      Engine

      On (READY)

      A/C switch

      On

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

      Tip:

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

    3. Turn the power switch off.

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

      Tip:

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

  2. CHARGE AIR CONDITIONING SYSTEM WITH REFRIGERANT

    Tip:

    Charge refrigerant in accordance with the equipment manual.

    1. Perform vacuum purging using a vacuum pump or appropriate equipment.

      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)

      E247093C07

      *a

      Standard Charge Amount

      *b

      Mean Value in Proper Range

      *c

      Overcharged

      *d

      High Pressure

      *e

      Sub-cool System

      *f

      Refrigerant Amount

      *g

      +/-30 g (+/-1.1 oz)

      -

      -

      Standard Charge Amount

      470 to 530 g (16.6 to 18.7 oz)

      Note:

      • Make sure that the amount of refrigerant is within 50 g (1.76 oz.) of the specified amount.

      • Do not turn the A/C switch on before charging the air conditioning system with refrigerant. Doing so may cause the compressor to work without refrigerant, resulting in overheating of the compressor.

      • The refrigerant amount should be checked by quantity (weight).

      Tip:

      Ensure that sufficient refrigerant is available to recharge the system when using a refrigerant recovery unit. Refrigerant recovery units are not always able to recover 100% of the refrigerant from an air conditioning system.

  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 air conditioning system with refrigerant, inspect for refrigerant leaks using a halogen leak detector.

      Tip:

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

    2. Carry out the test under the following conditions:

      • Turn the power switch off.

      • Ensure good ventilation (the halogen 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: approximately 392 to 588 kPa (3.9 to 5.9 kgf/cm2, 57 to 85 psi)

    3. E268308C01

      *a

      Inspect for leak

      *b

      Halogen Leak Detector

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

    4. E268309C01

      *1

      Drain Cooler Hose

      *a

      Halogen Leak Detector

      Bring the halogen leak detector close to the drain cooler hose with the detector power off, and then turn the detector on.

      Tip:

      • After the blower motor has stopped, leave the cooling unit for more than 15 minutes.

      • Bring the halogen leak detector sensor under the drain cooler hose.

      • When bringing the halogen leak detector close to the drain cooler hose, make sure that the halogen leak detector does not react to volatile gases. If it is not possible to avoid interference from volatile gases, the vehicle should be lifted up to allow checking for leaks.

    5. If a refrigerant leak is not detected from the drain cooler hose, remove the blower motor control from the cooling unit. Insert the halogen leak detector sensor into the unit and check for a leak.

    6. Disconnect the pressure sensor connector and leave it for approximately 20 minutes. Bring the halogen leak detector close to the pressure sensor and check for a leak.

      Tip:

      When checking for leaks, the presence of oily dirt at a joint can indicate a leak.