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Part IV Air Conditioner and Inside &

Outside Trim

Chapter 1 A/C System

A/C system consists of refrigerating and heating system. The Refrigeration system mainly comprises

compressor, condenser and evaporator. The refrigerant circulation absorbs the heat in the air and discharge

the vapour to lower the temperature in and dehumidify the compartment. The heating system is mainly

composed of heat exchanger and heater. It heats the compartment throught the heat exchanger by heating

the air with the heat from the cooling water in the engine. The control of air temperature, humidity and

velocity of flow in the compartment is realized by independent or joint working of heating and Refrigeration

system.

Section 1 The Structure & Working Principle of Refrigeration System

The structure of Refrigeration system is shown in Figure 1.

Figure 1 The Structure and Working Principle of Refrigeration System

1. Compressor 2. Condenser 3.Receiver/Drier

4.Pressure Relief Valve 5.Expansion Valve 6.Evaporator 7.Blower

Refrigeration system uses vapor compressing refrigeration cycle, comprising the compressor, condenser,

pressure relief valve, evaporator, blower , expansion valve, receiver/drier and pipe.

It's working principle is as shown in the Figure 1. The compressor (1) sucks in the refrigerant gas in the

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evaporator (6) via the expansion valve (5) for compression and generates high temperature and pressure

vapor which then is cooled into liquid through the condenser (2) and dried in the receiver/drier (3), then

restrict the expansion valve and enable certain amount of refrigerant liquid to be vapored into low tempera-

ture and pressure vapor in the evaporator, meanwhile, absorb large amount of heat and perform heat ex-

change with the air sucked in by the blower, then distribute the cooled air to the vehicle compartments. Cycle

the operation until the compartments gets the desired temperature.

See Table 1 for the Refrigeration system parameter.

Table 1 Refrigeration system parameter

Parameter

Control the mixture of cool and hot air

Nominal Refrigeration/W

4200

Displacement/(mL/r)

108

Model

SW-5H11

Electromagnetic Clutch Power Dissipation/W

45

SW-100/135

Maximum Airflow/(m

3

/h)

400

Airflow adjustment

4th Shift Manual

Motor Power Consumption/W

180

Dimension/mm

18×302×630

Heat Exchange/W

9400

Air Resistance/Pa

≤

156

Fan Motor Current/A

≤

8

Fan Motor RPM /(r/min)

2900±200

Dimension/mm

86×213×235

Refrigeration/W

4200

Thermal Expansion Valve

Inner Balance 1.5 ton

4PK830

630±20

 Refrigerant Fill/g

Blower

Condenser

Evaporator

 Drive belt

Item

Temperature adjustment method

 Compressor

Lubricant /mL

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Section 2 Heating System

Heating system uses mixed temperature adjustment which controls both cold and hot air and is featured in

outstanding temperature adjustment performance. The cold and hot air can be completely mixed at each

outlet and achieve continuous temperature adjustment. The air duct arrangement on the instrument panel is

shown in Figure 2. The air flow channel system is shown in Figure 3.

I. Heating System Parameter and Structure

Heating system uses water heating structure which uses the engine coolant as the heat source, leads the the

coolant into the heating radiator installed in the vehicle compartment and has the interior or exterior air blow

across the radiator with the blower to increase its temperature. The system consists of the blower assembly,

heating control assembly and heater assembly.

Figure 2 Heating Duct Arrangement

Inside and Outside Air Switch Door

 Outdoor Air

Indoor Air

Defogger

Intermidiate outlet

Heater

Blower Motor

Evaporator

Air Mix Door

Heating Radiator

Figure 3 Air Flow Channel System Illustration

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1. Heating System Parameter

Heating system radiating power, blower fan diameter, power dissipation and heater radiator dimension are

show in the table 2.

Table2

Heating System Parameter

2. Blower

Blower is located at the lower part of  the goods

compartment. The door inside the blower case is con-

trolled by the servomotor. The exchange of the air in-

side and outside the door can be achieved by adjusting

the door to import the outdoor air and recirculate the

indoor air.

Blower motor uses Permenant magnet DC motor with multple blade fan. In addition, there are a set of

resistance on the blower which adjust the fan, called as adjusting resistor. Blower provides wind supply not

only to the heating radiator, but also to the evaporator in the refrigeration system.

3. A/C Control Mechanism

A/C control mechanism is located in the middle of the instrument panel. All adjustment except the A/C switch

and inside and outside circulation switch are made by rotating the control knob. The A/C control panel is

shown in Figure 4.

1

Temperature adjustment control knob: control the mix ratio of the cold and hot air by adjusting the air mix

door, use the control knob to achieve continuous temperature adjustment.

2

Outlet control knob: use 4 ranges, different types of air flow adjustment available.

3

Inside and outside circulation switch: It can toggles between the introduction of outdoor air and recirculation

of the indoor air. (press the switch for inside circulation)

4

Blower switch: when the plum blossom range is closed, the remaining four ranges are used to adjust the

air flow.

5

A/C switch: as the switch of the refrigeration system, use press-button with built-in A/C indicator.

Dissipation Power/W                                        4000

Air Flow/(m

3

/h)

280

Power Consumption /W                                     180

Fan Diameter/mm                                         140

Overall Radiator Dimension                159.4mm×140mm×49mm

 Figure 4 A/C Control Panel