Compressor is driven by the drive belt, which is driven by
engine. extract compress gaseous refrigerant from the
evaporator. Refrigerant temperature rises to 83-110°C
(181-230 ºF), the pressure reaches 1,470 kPa (213.2 psi). Heat
is transferred to the condenser by high-pressure refrigerant,
and then taken away by the condenser air. because of the heat
dissipation, refrigerant is cooled. The temperature drops to
53-70°C (127-158 ºF) under high pressure refrigerant fluid is
sent to dryer storage. The reservoir fluid dryer is an
intermediary, filters water mixed in the refrigerant. Dried
refrigerant is transported to the expansion valve. Expansion
valve decompresses the refrigerant, from the expansion valve
the refrigerant mist pressure is 200 kPa (29 psi), the
temperature drops to 0-2°C (32-36 ºF). Refrigerant mist is
heated in the evaporator and evaporates. Finally, the air blower
blows air through the evaporator surface to each outlet.
because inside the evaporator refrigerant evaporation absorbs
heat, so the outlet air temperature is far below the environment
temperature. After evaporation the low-pressure refrigerant to
the air stream from the evaporator expansion valve box, at this
time the refrigerant pressure is 200 kPa (29 psi), the
temperature rises to 5-8°C (41-46 ºF). The low-pressure
refrigerant returns to the compressor through the air once again
compressed, air-conditioning refrigeration agent completes a
working cycle.
3. Heating System Working Principle
Hot Water Inlet
Warm Water Outlet
Air
Outlet
Hot Air
Outlet
Evaporator
Heater Core
Air Inlet
Blower
Fresh Air
Inlet
Inside
Circulation
Air Inlet
FE08-1003b
When the automatic air-conditioning system is in heating
mode, the heating and cooling control motor will transfer the
temperature control device to warm location, air entering the
heater core has the following effect:
–
Some air by-pass the heater core
–
Heat Transfer
Any air that does not need to be heated will enter the passenger
compartment, mixing with heated air to obtain the appropriate
air temperature. Engine coolant state is a key factor to the
heater system normal working.
4. Ventilation Control System Working
Principle
FE08-1004b
A variety of locations in the ventilation control system, enables
the model valve draw cold air, hot air and outside air through
the air duct to the air-conditioning system. Air enters into the
passenger compartment through the air duct.
In the "AUTO (Auto)" mode, the system will automatically select
the appropriate mode. Press the "MODE (mode)" button to
change the vehicle air supply mode. If the system currently
displays an air supply mode, press the "MODE (mode)" button
to select the next mode.
Air flow pattern changes according to the following:
–
Face - through the instrument panel air duct
–
Two way - through the instrument panel air duct, floor vent
–
Feet - through the floor vent
–
Mixing - through the floor vent, the Windshield vent
–
Defrosting - Windshield vent
8-12
Automatic Air-conditioning
Heating, Ventilation and A/C System
EC718/EC718RV EC715/EC715RV 10/2009
Summary of Contents for EC715 2009
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