HEATER SYSTEM

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Outline

•  The heater system warms the cabin condenser using the climate control of the heat pump system to warm the air passing through the cabin condenser.
•  To improve the heating performance, a PTC heater which uses electricity as the power source has been adopted.

Function

•  The heater system warms the air passing through the A/C unit by the heat pump system warming the cabin condenser.
•  The heater system warms the air passing through the A/C unit by the PTC heater generating heat.
•  When the ambient temperature is 25 degrees C or more, the heat pump system and the PTC heater stop to prioritize the electrical power consumption rate.

Structural view

L.H.D.

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R.H.D.

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Operation

1.  The electric compressor operates by turning on the A/C switch of the climate control unit to compress refrigerant. (1)

2.  The electric compressor discharges the high temperature, high pressure gaseous refrigerant, and it is sent to the cabin condenser. (2)

3.  The high temperature, high pressure gaseous refrigerant is circulated inside the tube in the cabin condenser. (3)

4.  When the airflow from the blower motor contacts the cabin condenser fins, the heat in the circulating refrigerant is released through heat exchange (heat radiation). As a result, the high temperature, high pressure gaseous refrigerant becomes a high temperature, high pressure liquid refrigerant. (3)

5.  The high temperature, high pressure liquid refrigerant is sent to the 2way valve for refrigerant. (4)

6.  Because the 2way valve for refrigerant is on (closed) during climate control, the high temperature, high pressure liquid refrigerant passes through the orifice. (5)

7.  The high temperature, high pressure liquid refrigerant is depressurized by the expansion action of the orifice iris and becomes a low temperature, low pressure atomized liquid refrigerant. (5)

8.  The low temperature, low pressure atomized liquid refrigerant is sent to the condenser. (6)

9.  The low temperature, low pressure, atomized liquid refrigerant is circulated inside the tube in the condenser, and becomes a low temperature, low pressure gaseous refrigerant by heat exchange (heat radiation). (7)

10.  The low temperature, low pressure gaseous refrigerant is sent to the 3way valve for refrigerant. (8)

11.  Because the 3way valve for refrigerant is off (accumulator side: Open), the low temperature, low pressure gaseous refrigerant is sent to the accumulator. (9)

12.  To avoid liquid refrigerant from flowing into the electric compressor, gaseous refrigerant and liquid refrigerant are separated by the accumulator to temporarily store liquid refrigerant. (10)

13.  The low temperature, low pressure gaseous refrigerant is sent to the electric compressor and circulates the refrigerant cycle. (11)

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14.  The heating in the vehicle is performed by passing airflow from the blower fan through the warmed cabin condenser.

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PTC Heater

•  For the PTC heater operation, refer to the [PTC HEATER]. (See POSITIVE TEMPERATURE COEFFICIENT (PTC) HEATER.)