Prius PHV Air Conditioning Toyota Motor Europe

Overview : Available —: Not Available Items PRIUS Plug-in PRIUS Heater Control Panel Automatic A/C  A/C Unit Some of air is always re-circulated Plasmacluster Generator (-A Only) — Heater SFA (Straight Flow Aluminum) -II Heater Core PTC Heater 165 W x 3 280 W x 3 Heat Pump System Electric Water Pump (for Heater and Engine Cooling) Compressor Scroll Type Compressor with Motor (A/C Inverter integrated) ES14 ES27 Compressor Oil: ND-OIL11 Compressor capacity is increased to reduce compressor speed and noise.

Overview : Available —: Not Available Items PRIUS Plug-in PRIUS Condenser MF-IV Sub-cool Condenser in Engine Compartment  in A/C Unit — Evaporator ECS (Ejector Cycle System) Evaporator Servo Motor Pulse Detection Type Servo Motor with Bus Connector Blower Brushless Motor Models with Solar Power Ventilation System for All Models Clean Air Filter Pollen Removal Type Sensor Humidity Sensor Refrigerant HFC134a Control Solar Ventilation System Control Remote Air Conditioning System Control Cooling Operation Heating Operation Eco Mode Control

Heat Pump System Plug-in Hybrid with Heat Pump System Start Goal Heater ON EV Driving Plug-in Hybrid with Heat Pump System The heat pump system (electric energy) is used when the engine is cold Engine is warmed-up only for the heating operation (It lowers fuel economy) EV Driving Plug-in Hybrid without Heat Pump System

Heat Pump System System Diagram Dehumidification Magnetic Valve High Pressure Magnetic Valve Heating 3-way Valve Accumulator Refrigerant Outlet Temp. Sensor Orifice A/C Pressure Sensor Heat Exchanger Shut Valve Low Pressure Magnetic Valve Engine M H C Condenser C E Refrigerant Inlet Temp. Sensor Heater Core The accumulator functions as gas-liquid separator. Condenser Air Mix Damper Compressor with Motor ECS Evaporator Expansion Valve Electric Water Pump A/C Unit

Heat Pump System Parts location A/C Unit (RHD Model) PTC Heater Condenser Heater Core ECS Evaporator Blower Motor A/C Unit (RHD Model)

Heat Pump System Parts location Refrigerant Outlet Temp. Sensor A/C Unit A/C Pressure Sensor Expansion Valve Compressor with Motor Dehumidification Magnetic Valve Heating 3-way Valve Accumulator Condenser High Pressure Magnetic Valve Low Pressure Magnetic Valve Heat Exchanger Shut Valve Refrigerant Inlet Temp. Sensor

Heat Pump System Refrigerant line (All) E H M M H C E: Evaporator C: Condenser H: Heater Core M: Compressor with Motor C E A Condenser A/C Unit View from A

Refrigerant Outlet Temp. Sensor Heat Pump System Refrigerant line (1/3) E C H M M H C A/C Pressure Sensor E: Evaporator C: Condenser H: Heater Core M: Compressor with Motor C E Refrigerant Outlet Temp. Sensor Compressor with Motor Heating 3-way Valve

Heat Pump System Refrigerant line (2/3) E H M H C M E: Evaporator C: Condenser H: Heater Core M: Compressor with Motor C E Expansion Valve Heat Exchanger Shut Valve Dehumidification Magnetic Valve High Pressure Magnetic Valve

Heat Pump System Refrigerant line (3/3) E H M H C M E: Evaporator C: Condenser H: Heater Core M: Compressor with Motor C E Refrigerant Inlet Temp. Sensor Accumulator Low Pressure Magnetic Valve

Heat Pump System Cooler cycle Close Open OFF Open Close Engine M H C E Cooled Air C [Cooler Cycle] Evaporator: Heat-absorbing Condenser (in Engine Compartment): Heat Dissipation Condenser (in A/C Unit): Heat Dissipation High Pressure Magnetic Valve: Open (OFF) Low Pressure Magnetic Valve: Close (OFF) Dehumidification Magnetic Valve: Close (OFF) Heat Exchanger Shut Valve: Open (OFF) Heating 3-way Valve: OFF NOTE: In the cooler cycle, all magnetic valves are OFF. E: Evaporator C: Condenser H: Heater Core M: Compressor with Motor A/C Unit

Heat Pump System Heat Pump Cycle Close Close ON Open Open Warmed Air Engine M H C C E [Heat Pump Cycle] Dehumidification Valve Evaporator: Nonfunctional Condenser (in Engine Compartment): Heat-absorbing Condenser (in A/C Unit): Heat Dissipation High Pressure Magnetic Valve: Close (ON) Low Pressure Magnetic Valve: Open (ON) Dehumidification Magnetic Valve: Close (OFF) Heat Exchanger Shut Valve: Open (OFF) Heating 3-way Valve: ON E: Evaporator C: Condenser H: Heater Core M: Compressor with Motor A/C Unit

Warmed and Dehumidified Air Heat Pump System Heat Pump Cycle (With dehumidification) [A] Open Close ON Close Close Warmed and Dehumidified Air Engine M H C C E [Heat Pump Cycle (with Dehumidification) [A]] Evaporator: Heat-absorbing Condenser (in Engine Compartment): Nonfunctional Condenser (in A/C Unit): Heat Dissipation High Pressure Magnetic Valve: Close (ON) Low Pressure Magnetic Valve: Close (OFF) Dehumidification Magnetic Valve: Open (ON) Heat Exchanger Shut Valve: Close (ON) Heating 3-way Valve: ON E: Evaporator C: Condenser H: Heater Core M: Compressor with Motor A/C Unit

Warmed and Dehumidified Air Heat Pump System Heat Pump Cycle (With dehumidification) [B] Open Close ON Open Open Warmed and Dehumidified Air Engine M H C C E [Heat Pump Cycle (with Dehumidification) [B]] Evaporator: Heat-absorbing Condenser (in Engine Compartment): Heat-absorbing Condenser (in A/C Unit): Heat Dissipation High Pressure Magnetic Valve: Close (ON) Low Pressure Magnetic Valve: Open (ON) Dehumidification Magnetic Valve: Open (ON) Heat Exchanger Shut Valve: Open (OFF) Heating 3-way Valve: ON E: Evaporator C: Condenser H: Heater Core M: Compressor with Motor A/C Unit

Heat Pump System Heating operation by engine coolant Close Open OFF Warmed Air Engine M H C C E [Heating Operation by Engine Coolant] Heater Core: Heat Dissipation Evaporator: Nonfunctional Condenser (in Engine Compartment): Nonfunctional Condenser (in A/C Unit): Nonfunctional High Pressure Magnetic Valve: Open (OFF) Low Pressure Magnetic Valve: Close (OFF) Dehumidification Magnetic Valve: Close (OFF) Heat Exchanger Shut Valve: Open (OFF) Heating 3-way Valve: OFF NOTE: A/C system is cooler cycle when heating by engine coolant. E: Evaporator C: Condenser H: Heater Core M: Compressor with Motor Electric Water Pump A/C Unit

with Dehumidification Heat Pump System Heat Pump Operating Conditions Heat Pump The heating performance by the current coolant temp. is lower than the target heating performance Heat Pump Cycle Windshield glass is hard to fog up A/C switch indicator is turned off by pressing A/C switch Windshield glass is easy to fog up (with A/C switch indicator ON) Engine Coolant The heating performance by the current coolant temp. is higher than the target heating performance Front DEF switch is pressed (with windshield glass is easy to fog up) Temp. setting is MAX HOT Ambient temp. is approx. –2 °C (28.4 °F) or less Frost is detected at the condenser (in the engine compartment) with Dehumidification Heat Pump Cycle (with Dehumidification) [A] A humidity sensor is used in order to calculate the easiness of the windshield glass fog up. In the heat pump cycle, there is a possibility that the condenser (in the engine compartment) frosts under the subfreezing temperature. This causes the decrease of the heat transfer efficiency and an enough heating performance cannot be secured. Therefore, the heat pump cannot be used when the ambient temp. is approx. –2 °C (28.4 °F) or less. [Dehumidification [A] and [B]] Dehumidification [A] and [B] are switched in accordance with the evaporator temperature. At first, the dehumidification [A] is used. When the heating load becomes high, it is necessary to raise the discharge pressure of the compressor to increase heating performance. At this time, refrigerant flow volume in the evaporator increases. As a result, the evaporator temp. decreases below zero and the frost is formed at evaporator. In order to prevent this, the heat pump cycle is changed to the dehumidification [B] when the evaporator temp. decreases. In the dehumidification [B], the refrigerant flow to the condenser (in the engine compartment) is added and the flow volume in the evaporator decreases. Therefore, the decrease in the temperature of the evaporator can be suppressed. Less than 2.5 °C (36.5 °F) 2.5 °C (36.5 °F) or more Evaporator temp. Heat Pump Cycle (with Dehumidification) [B]

Heat Pump System Automatic Defrosting Operation A/C Amplifier Refrigerant Inlet Temp. Sensor Signal Approx. –15 °C (5 °F) or less continues for 30 sec. Heat Pump Cycle Start request Engine Judges that the condenser (in the engine compartment) is frosted Warmed up Heating operation is changed from heat pump type to engine coolant type Changes to cooler cycle in order to defrost the condenser (for 20 min.) When the condition that the refrigerant inlet temp. is approx. –15 °C (5 °F) or less continues for 30 sec. or more, the A/C amplifier judges that the condenser (in the engine compartment) is frosted. At this time, engine is started. After the engine is warmed up, A/C cycle is changed to cooler cycle to defrost the frosted condenser (in the engine compartment). This defrosting operation is performed for 20 min. During this time, the heating operation is performed by the warmed engine coolant. Required Flow Volume of the Electric Water Pump Cooler Cycle

[with dehumidification] [without dehumidification] Heat Pump System A/C switch indicator A/C Switch Indicator A/C System Cooler Cycle Heat Pump Cycle ON Compressor ON [with dehumidification] (Automatically dehumidified if necessary) OFF Compressor OFF [without dehumidification] During cooler cycle, ON/OFF condition of the A/C switch indicator shows the compressor ON/OFF condition. During heat pump cycle, ON/OFF condition of the A/C switch indicator shows the system condition whether the dehumidification operation is possible. ON: The dehumidification operation is automatically performed when it is necessary. OFF: The dehumidification operation is not performed even if the windshield glass is easy to fog up. NOTE: ON/OFF condition of the A/C switch indicator (= system condition whether the dehumidification operation is possible or not) can be changed by pressing the A/C switch. A/C Switch

Easiness of the windshield glass fog up Heat Pump System Humidity Sensor Glass Humidity Glass Temp. Glass Surroundings Temp. A/C Amplifier Easiness of the windshield glass fog up Controls A/C system Humidity Sensor Glass Humidity Sensor Glass Temp. Sensor Glass Surroundings Temp. Sensor A newly developed humidity sensor consists of the glass humidity sensor, glass temp. sensor and glass surroundings temp. sensor. The output signal of these sensors is used for the calculation of the easiness of the windshield glass fog up. Energy loss reduced Prevents windshield glass from fogging up

Heat Pump System Humidity sensor controls Air Inlet Mode Control Easiness of the windshield glass fog up Air Inlet Mode Control Air Outlet Mode Control Airflow Volume Control Hard to fog up Easy to fog up FRE 100% Increase FER Air Keep REC/FRE ratio Increase REC Air FOOT/DFF Mode Normal Control +5 [Air Inlet Mode Control] Increase circulated air volume in the range where the windshield glass does not fog up to reduce the energy loss. When the windshield glass is easy to fog up, the system increases fresh air volume to prevent windshield glass from fogging up. [Air Outlet Mode Control] When the windshield glass is easy to fog up, the system changes the air outlet mode to FOOT/DEF mode to prevent windshield glass from fogging up. [Airflow Volume Control] When the windshield glass is easy to fog up, the system increases airflow volume to prevent windshield glass from fogging up. Blower Level +1 ±0

Remote Air Conditioning System Activation Press and Hold Electric power supplied through the plug-in function Major Difference From PRIUS [Following precautions are the same as PRIUS] Vehicles with the remote air conditioning system have the following risks that it is necessary to be aware of when performing repairs. Therefore, make sure to take care of the key (electrical transmitter) carefully so that the remote air conditioning system is not operated unexpectedly. [Risks] - The electrical fan and other items in the engine compartment may operate resulting in various hazards. - The wipers may operate if the wiper switch is in the on position when the remote air conditioning system is activated. If this occurs, there is the potential for damage to the glass, wipers or injury. - When the light control switch is in the tail, head or AUTO position, the headlights may turn on. - Short circuits may occur if electrical inspections are being performed when the remote air conditioning system is turned on, because the IG circuit is powered at this time. Model PRIUS Plug-in PRIUS Operation Cooling and Heating Cooling only Operating Condition While plug-in charging While power mode OFF Power Supply Supplied through the plug-in function HV Battery Solar Ventilation System N.A. Equipped

Remote Air Conditioning System System Diagram Battery Charger Battery Charger Inlet HV Battery (Sub 1, 2) Charger Relay HV Battery (Main) High-voltage Wire Harness Boost Converter (Sub) HV Battery Assembly Power Switch Shift Position Sensor Stop Light Switch Boost Converter (Main) DC-DC Converter Inverter Assembly IG1, IG2 Relays Compressor with Motor Room Temp. Sensor Power Management Control ECU Ambient Temp. Sensor Door Control Receiver Certification ECU Power Management Bus V Bus No.1 Solar Sensor A/C Amplifier Main Body ECU Blower Motor Remote Air Conditioning Switch Servo Motors Door Courtesy Light Switch Door Lock Position Switch Hood Courtesy Switch PTC Heater

Remote Air Conditioning System Operating Conditions Operation Start Condition Press and hold the remote air conditioning switch for 0.8 sec or more when all the following conditions are satisfied Power mode is OFF Power switch is not pressed Shift position is in P All the doors are closed and locked Engine hood is closed Brake pedal is not depressed Theft deterrent system is not in alarm state While plug-in charging Cooling or heating operating conditions meet the set temperature [Following operations are the same as PRIUS] When the remote air conditioning system is activated, the wireless door lock is also activated, blinking the hazard lights once and sounding the wireless door lock buzzer once, thus improving anti-theft performance and informing the user of the operating state. When the remote air conditioning system is deactivated by the remote air conditioning switch, the hazard lights blink twice and the wireless door lock buzzer sounds twice, informing the user of the operating state. Operation Stop Condition [OR] When the operation start condition are not met Approx. 30 min. have elapsed When the remote air conditioning switch is pressed twice within 3 sec.

Remote Air Conditioning System Operation Operation start conditions are satisfied A/C system operates in accordance with the set temp. Heating Operation Cooling Operation Ambient Temp. -2 °C (28.4 °F) or more Less than -2 °C (28.4 °F) During operation, the set temperature before the power mode off is used for the A/C operation. Because there is a possibility that the condenser (in the engine compartment) frosts under the subfreezing temperature during the heat pump cycle, the PTC heater is used when the ambient temp. is less than –2 °C (28.4 °F). Heat Pump (Heating Cycle) PTC Heater Maximally 3 PTC heaters (280 W x 3) are operated in accordance with the max. permissible power

Air Conditioning System Refrigerant PRIUS Plug-in: 670 g (23.6 oz.) PRIUS: 470 g (16.6 oz.) Standard Refrigerant Amount 100 g (3.53 oz.) High Pressure Overcharged +/- 50 g (+/- 1.76 oz.) Point where bubbles disappear Refrigerant Amount