AIR CONDITIONING SYSTEM


  1. OUTLINE


    1. The automatic air conditioning system uses left and right independent temperature control and neural network control to enhance comfort.*1

    2. A 4-zone temperature control, which can adjust the temperature of the rear seats independently, is provided in addition to the left and right independent temperature control.*2

    3. The Infrared Rays (IR) matrix sensor for detecting the surface temperature of the front and rear occupants is provided.*2

    4. An inside-and-outside dual air layer type air conditioning unit is used. The upper layer ensures anti fogging performance by introducing outside air, and the lower layer aims for ventilation loss reduction by circulating the inside air, achieving energy conservation.

    5. Lexus climate concierge is used to offer a superior feeling of comfort by achieving cooperative control performance between automatic air conditioning system control, the seat heater system, the climate control seat system and the steering wheel heater system.*3

    6. A Lexus climate concierge monitor, which makes it possible to set the air conditioning system, seat heater system, climate control seat system and steering wheel heater system to AUTO mode all at once and check the operation conditions visually, is used on models with Lexus climate concierge.*3

    7. S-FLOW control is used to concentrate the air outlets on the driver seat or front seats when the temperature and moisture in the cabin are stable, thus aiming for a reduction in the burden on the air conditioning to achieve energy conservation.

      Tech Tips

      *1: Models with left and right independent temperature control

      *2: Models with multi-zone (4-ZONE) climate control

      *3: Models with seat heater system, climate control seat system or steering wheel heater system

  2. SPECIFICATIONS


    1. Front Air Conditioning System

      Component Specifications
      Heater Radiator Unit Sub-assembly Type Straight Flow Aluminum-II (SFA-II)
      Size (W x H x L) 284.7 mm x 120 mm x 27 mm (11.2 in. x 4.7 in. x 1.1 in.)
      Fin Pitch 1.5 mm (0.06 in.)
      Blower Motor with Fan Sub-assembly Motor Type DC Ferrite Brushless
      Fan Type Sirocco
      Fan Size (Dia. x H)

      137 mm x 51 mm (5.4 in. x 2.0 in.)*1

      140 mm x 35 mm (5.5 in. x 1.4 in.)*2
      Cooler Condenser Assembly Type Global Inner-fin Condenser (GIC)
      Size (W x H x L) 680 mm x 453 mm x 11.5 mm (26.8 in. x 17.8 in. x 0.5 in.)
      Fin Pitch

      2.5 mm (0.10 in.)*3

      3.0 mm (0.12 in.)*4
      Cooler Compressor Assembly Type

      7SES17C*5

      7SAS17C*6
      Refrigerant Type

      HFC-134a (R-134a)*7

      HFO-1234yf (R-1234yf)*8
      No. 1 Cooler Evaporator Sub-assembly Type Cold Storage (CS)
      Size (W x H x L) 306.5 mm x 195 mm x 50 mm (12.1 in. x 7.7 in. x 2.0 in.)
      Fin Pitch 3.4 mm (0.1 in.)

      *1: Upper side

      *2: Lower side

      *3: Models for G.C.C. ountries

      *4: Except models for G.C.C. countries

      *5: Models with 7SES17C type compressor

      *6: Models with 7SAS17C type compressor

      *7: Models using HFC-134a (R134a) refrigerant

      *8: Models using HFO-1234yf (R1234yf) refrigerant

    2. Rear Air Conditioning System (Models with Rear Cooling Unit Assembly)

      Component Specifications
      Blower Motor with Fan Sub-assembly Motor Type DC Ferrite Brushless
      Fan Type Sirocco
      Fan Size (Dia. x H) 145 mm x 61.1 mm (5.7 in. x 2.4 in.)
      Cooler Evaporator Sub-assembly Type Revolutionary super-Slim (RS)
      Size (W x H x L) 145.7 mm x 171 mm x 38 mm (5.7 in. x 6.7 in. x 1.5 in.)
      Fin Pitch 3.0 mm (0.12 in.)

  3. MAIN FEATURES


    1. The air conditioning system has the following features:

      Feature Outline
      High Performance

      • Neural network control is used, so passengers can finely control the air conditioning for maximum comfort.

      • The rear outlets are installed on the back of the center console, floor and center pillar to ensure comfortable air conditioning performance for the rear passengers.

      • A high efficiency type clean air filter, which has a pollen-and-odor removal effect, is used.

      • Pollen removal mode control is used to remove pollen in the area around the upper part of the bodies of the driver and front passenger.

      • The blower control has 7 levels in manual mode and 31 levels in auto mode for more precise control.

      • The rear cooling unit is used to ensure comfortable cooling performance for the rear passengers.*1
      Light Weight

      • A bus connector with a built-in IC is used in a lightweight wire harness design to allow a reduced number of wires.

      • The use of this connector means that pulse pattern type servo motors can be used.
      Compact A blower motor with a built-in blower motor controller is used to achieve a compact construction for the front air conditioning system.
      Others

      The following parts are used to ensure high cooling performance while achieving a compact and lightweight construction:


      • Semi-center Location Air Conditioning Unit

      • 7SES17C Type Compressor*2

      • 7SAS17C Type Compressor*3

      • Cold Storage (CS) Evaporator

      • Straight Flow Aluminum (SFA)-II Heater Radiator Sub-assembly

      • Global Inner-fin Condenser (GIC)

      • A [nanoeTM]*4 generator is provided to achieve excellent air quality and comfort in the cabin.

      Tech Tips

      *1: Models with rear cooling unit assembly

      *2: Models with 7SES17C type compressor

      *3: Models with 7SAS17C type compressor

      *4:

      B00569U

      [nanoeTM] is a trademark owned by Panasonic Co., Ltd.

  4. PRECAUTION


    1. Precaution for Refrigerant HFO-1234yf (R1234yf)


      1. Compatibility


        1. The parts used in the refrigerant cycle, the compressor oil, etc. of the HFO-1234yf (R1234yf) system are not compatible with the conventional HFC-134a (R134a) system.

        2. Always use HFO-1234yf (R1234yf) as the refrigerant.

        CAUTION:


        • Do not charge the system with refrigerant near open flames, as HFO-1234yf (R1234yf) is combustible.

        • When charging the system with refrigerant, make sure the area is well ventilated (especially be careful in areas where the gas can easily accumulate such as under lifts and in garage pits, as the gas is heavier than air).

        • Follow any local regulations regarding combustible gases.

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

        Tech Tips

        The shape of the service port for refrigerant charging has an exclusive design conforming to international standards for HFO-1234yf (R1234yf) to prevent improper refrigerant charging.

      2. Compressor Oil


        1. Always use ND-OIL 12 as the compressor oil.

        2. When parts of the air conditioning system are removed, quickly block off any areas that are exposed to the outside air with plugs, vinyl tape, etc., as the oil used for HFO-1234yf (R1234yf) systems absorbs moisture easily.

        3. Do not allow the compressor oil to spray, as the oil used for HFO-1234yf (R1234yf) systems has harmful effects on acrylic resins.