8.2.1.2 Refrigeration system parameters 

Items Item 

parameter 

Nominal refrigerating capacity/W 

≥4500(rotational speed of compressor is 
1800rpm) 

Displacement/(ml/r) 180 

Model HS18 

Compressor 

Electromagnetic clutch consumption 
power/W 

46 

Max.air volume/(m3/h) 

500 

Air Volume Control 

Automatic 

Blower 

Motor consumption power/W 

250 

Size /mm 

68×422×731 

heat exchange amount/W 

≥15000 

Condenser 

Air-side resistance/Pa 

≤110 

Refrigerating capacity/W 

≥5500 

Evaporator 

H-type expansion valve (ton of 
refrigeration) 

1.5 

Temperature regulating method 

Control cold-warm air mixture ratio 

Lubricating oil/ml 

FD46XG:150±10 ml 

Driving belt (JL4G18-E) 

Poly V-belt (6PK1875) 

Driving belt (JLD-4G20//JLD-4G24) 

Poly V-belt (

7PK1956

) 

8.2.1.3 System Capacity 

Specification 

Applications 

(Metric) English 

system 

Refrigerant lubricating oil (100PG) 

Refrigerant flow away suddenly 

40 ml* 

1.34 oz* 

Replacement of compressor 

Note: if the lubricating oil discharged in the course of recyclinging the refrigerant is not replaced, the compressor 
may be damaged.

 

The compressor on the vehicle is pre-filled with 150 ml** (5 oz** ) of refrigerant lubricant (100PG). 

Replacement of Condenser 

40 ml

**

 1.34 

oz

**

 

Replacement of evaporator 

60 ml

**

 2.0 

oz

**

 

Replacement of Stored Fluid Dryer    Core 

20 ml# 

0.67 oz# 

# The oil volume of 100PG to be filled should be equal to the sum of emission and specified volume of old liquid 
reservoir dryer core. 

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Replacement of any pipe assembly (hose/pipe or pipe 
assembly) 

30 ml

**

 1.0 

oz

**

 

The refrigerant lubricating oil capacity of the whole 
system 

150 ml 

5.0 oz 

R-134a 

Refrigerant charging capacity 

550±50 g 

1.21±0.11 b 

*It may cause natural leakage of refrigerant, and will not cause refrigerant oil loss. Due to the large number of 
leaks, hose rupture and collision or pressure release valve opening, 
The refrigerant is suddenly lost. When replacing the parts resulting in a hug loss of refrigerant, be sure to add 
sufficient lubricating oil for them. 

 

8.2.1.4 Resistance Properties of Evaporator Temperature Sensor 

NL08-2022b

温度

阻值

（

C

）

（

k

）

 

Temperature (°C) 

Re

si

sta

nce

 value

 (K

Ω

) 

1680

 
 

 

8.2.2 Description and operation 

8.2.2.1 Description and operation 

1 Overview 

The automatic A/C system will provide comfortable riding environment to the passenger no matter how the 
outside weather is; and the system consists of the following main parts: 

– Refrigeration 

system 

– Heating 

system 

–   Air distribution system 

– 

Mode /temperature control system 

2 Compressor: 

The A/C compressor is driven by the engine crankshaft driving the compressor clutch belt pulley through the 
transmission belt; when the electromagnetic clutch coil is not energized, the compressor belt pulley freely rotates 
without driving the compressor shaft; after the clutch coil is energized with voltage, the clutch plate and the hub 
are pushed to the belt pulley and are locked integrally through the magnetic force to drive the compressor shaft. 
The compressor is equipped with a unique lubrication system. The oil absorption port of the crankshaft discharges 
through the rotating swash plate, such a path allows the lubrication of the swash plate bearing. The rotation 
generates the effect of engine oil separation; certain engine oil is separated from the leakage liquid at the 
crankcase liquid suction port to reflow back into the crankcase. Refluent engine oil can lubricate the mechanical 
part of the compressor. 

The compressor is closed with the following conditions: 

– 

Full throttle valves are "ON" 

– Low 

idling 

– 

Ambient temperature is low 

– 

Engine coolant temperature is too high 

Pressure of refrigerant is higher than 3.2MPa (464.1pounds/ square inch) or lower than 0.2Mpa (21.9 pounds/ 
square inch). 

Notes: 

Do not impact, have fall or keep top down the compressor. If the compressor is impacted or kept top down, you 
should rotate the compressor clutch 5 to 6 times with hand to circulate the engine oil precipitated in the cylinder. 
When the engine oil is in the cylinder, sudden revolution of the compressor will cause the valve to be damaged 
and have adverse effect on the durability. 

3. Condenser.receiver 

dryer 

High-temperature high-pressure refrigerant steam from an air condition compressor is flowed into a condenser. 
The condenser consists of an aluminum pipe capable of performing rapid heat transmission and a cooling fin, 
wherein the cooling fin condensates the high-temperature high-pressure refrigerant steam into 
medium-temperature high-pressure liquid through radiation. Located on the left side of the condenser, the stored 
fluid dryer is welded with the condenser as a whole. The internal structure design of the stored fluid dryer    can 
ensure the moderate temperature and high pressure refrigerant entering the dryer    is in a mixed status of gas and 
liquid and the moderate temperature and high pressure refrigerant coming out of the dryer    is in the liquefied 
status. 

The stored fluid dryer contains drying agent which can absorb the moisture of the refrigeration system and the 
drying agent cannot be reused. Due to the following reasons, the receiver-dryer core can not be repaired but 
replaced when leaking. 

– Perforation 

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– 

Seal area damaged 

– 

Time is too long for external air enter into the system 

4.  Indoor temperature sensor, outdoor temperature sensor 

The following sensor affects the automatic control of the in-vehicle air temperature: 

– 

Indoor temperature sensor 

– 

Outdoor temperature sensor 

These sensors are thermosensitive elements sensitive to temperature; the resistance and the temperature of the 
sensor are in inverse proportion corresponding relationship; the level of the signal transmitted to the A/C control 
module is determined by the resistance value; and the A/C control module sets the command signal needed to the 
following parts by using the information. 

– 

Inside and outside circulation motor 

– 

Cool-warm temperature wind direction motor 

– 

Blower motor control module 

The indoor temperature sensor housing is connected with the inhaler through the hose pipeline, the air flow from 
the A/C head unit forms a minute vacuum degree at the end part of the inhaler hose; and such vacuum formation 
realizes the following functions. 

– 

To make the indoor air flow through indoor temperature sensor. 

– 

Improved accuracy of sensor detecting temperature 

The outdoor temperature sensor is located in the front grid area below the front bump of the vehicle; the A/C 
control module uses the sensor to obtain the ambient air temperature information; and the information A/C control 
module can be used for displaying the outside terminal on the instrument display screen. 

5. Sunlight 

sensor 

The sunlight sensor is located in the middle of the upper trim cushion of the instrument panel . The sunlight sensor 
belongs to the light energy sensor, which can measure the heat produced by sunlight hitting the vehicle to provide 
more compensation parameter to the A/C control module. A/C control module automatically adjusts the A/C 
volume and cold/hot wind mixing proportion in real time according to the state of the external illumination 
intensity, so that all passengers are able to get the most comfortable feeling. 

6.  Indoor temperature sensor 

The indoor temperature sensor is integrated in the automatic A/C control panel to connect with the suction hose; 
and the in-vehicle temperature is collected through the suction of the wind direction passing through the inside of 
the warm air assembly housing. 

7.  Main host of indoor A/C 

The indoor A/C head unit is located in the instrument panel , including a blower motor, a blower motor control 
module, an A/C filter, a heater core, an evaporator, an expansion valve, a warm and cold temperature wind control 
motor as well as a variety of air deflection throttles and ventilation ducts. 

A. Blower 

motor 

Notes: 

When placing the blower motor, the fan wheel of the blower motor can not be used as the supporting surface. 

To prevent the fan wheel blade from being damaged, inhibit collision of the fan wheel. 

The blower consists of the following parts: 

– 

Permanent magnet-type motor 

– Squirrel-cage 

fan 

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