JAC HFC4DA1-2C engine. Instruction — part 24

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Air Conditioner

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- 160 -

Instruction

Instruction

Instruction

Instruction and

and

and

and Operation

Operation

Operation

Operation

Precautions

Precautions

Precautions

Precautions

5.

R-134a shall be adopted as refrigerant.
Use of other kinds of refrigerant may bring
negative effect to system components.

6.

R-134a refrigerant

and R-12

refrigerant

are

incompatible, so even little amount of R-12
refrigerant is not allowed to be mixed into R-134a
refrigerant.

7.

When handling refrigerant, please note that the
surroundings must be free from any tinder or
inflammable, for the exposure of refrigerant
reservoir to heat source shall lead to explosion.

8.

R134a refrigerant container is under high pressure
status, so please don’t place it under high
temperature condition and the ambient temperature
for storage should be below 52℃.

Keep Away From

Inflammables

Keep Away From Heat

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Instruction and Operation

Precautions

9.

Generally, dust covers are adopted for A/C
components, in order to avoid access of sewage,
dust and moisture. Dust covers should be removed
before operation and sealed after operation.

10.

During the reinstallation of A/C system after
removal, please apply refrigerant oil onto the
O-ring. As for screwed joints, install them by hand
and then use two wrenches for tightening. As for
the flanged joints, install nuts and bolts when
pushing the pipeline gently.

11.

During A/C

installation,

over

tightening

or

clamping of O-ring may cause refrigerant leakage,
so please operate as per specified torque.

12.

Hoses shall be free from distortion.

Moisture

Dust

First by hand and then with tools

Tighten to the specified torque

Don’t distort hose.

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Instruction

Instruction

Instruction

Instruction and

and

and

and Operation

Operation

Operation

Operation

Functional

Functional

Functional

Functional operation

operation

operation

operation

1.

“TO-FACE” mode

Air is adjusted when passing through system and
vented out through upper air vent. This mode is
applied to most of places using A/C.

2.

“TO-FACE/FEET” mode

Air is adjusted and vented out through upper air
vent and floor air vent. The air from floor air vent
is hotter than that from upper air vent. However,
when

the

temperature

knob

is

rotated

counterclockwise to the end (hottest) or clockwise
to the end (coldest), air temperature from two
different positions are the same.

3.

“TO-FEET” mode
Air is vented out through the bottom air vent.

4.

“TO-FEET” plus “DEFROST” mode

Air is vented out through the bottom air vent and a
little air is vented out through defroster air vent and
air vent of side window defroster.

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Instruction

Instruction

Instruction

Instruction and

and

and

and Operation

Operation

Operation

Operation

Functional

Functional

Functional

Functional operation

operation

operation

operation

5.

Defroster

Air is adjusted and vented out through defroster air
vent and a little air is vented out through side
window defroster. It is recommended to use this
mode only in foggy or icy weather.

6.

Internal/external circulation select button
Press this button and the indicator shall lighten,
indicating the internal circulation mode is applied;
press this button again and the external circulation
mode is selected.

7.

Front control panel air volume knob
Rotate the air volume knob shown in the right
figure to achieve perfect control of the air volume
of blower. Rotate leftwards, the air volume shall
decrease, and rightwards, the air volume shall
increase.

8.

A/C switch

Press this switch with the indicator on, indicating
the A/C system is in operation. Press this switch
again, and the A/C system is turned off.
If the fan knob is located at off position instead of
at certain position within speed setting range, the
A/C system cannot operate.

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Instruction

Instruction

Instruction

Instruction and

and

and

and Operation

Operation

Operation

Operation

Functional

Functional

Functional

Functional operation

operation

operation

operation

9.

Front control panel temperature control knob

Rotate the knob within the range shown in the
right figure, and the interior temperature can be
controlled within the indicated range.

10. Rear control panel cold/warm select knob

Rotate the knob within the red zone, the vented air
is warm air; rotate the knob within the blue zone,
the vented air is cold air.

11. Rear control panel air volume knob

Rotate the air volume knob shown in the right
figure to achieve perfect control of the air volume
of blower. Rotate leftwards, the air volume shall
decrease, and rightwards, the air volume shall
increase.

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Diagnosis

Diagnosis

Diagnosis

Diagnosis and

and

and

and Testing

Testing

Testing

Testing

Operating

Operating

Operating

Operating principle

principle

principle

principle

1.

During operation, low pressure gaseous refrigerant
from evaporator transforms into high pressure and
high

temperature

gas

after

passing

through

compressor, which transforms into high pressure
and low temperature liquid after being cooled by
condenser radiating pipe; the liquid, after being
dehumidified and buffered by receiver drier, flows
into expansion valve at stable pressure and flow
rate, and finally flows into evaporator through
throttling and depressurization; the refrigerant
evaporates

and

absorbs

abundant

heat

once

encountering low pressure condition.

2.

High-pressure side of refrigerating system.

3.

Low-pressure side of refrigerating system.

4.

Compression process.

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Diagnosis

Diagnosis

Diagnosis

Diagnosis and

and

and

and Testing

Testing

Testing

Testing

Operating

Operating

Operating

Operating principle

principle

principle

principle

5.

Condensation process.

6.

Throttling and expansion process.

7.

Evaporation process.

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Diagnosis

Diagnosis

Diagnosis

Diagnosis and

and

and

and Testing

Testing

Testing

Testing

Air

Air

Air

Air distribution

distribution

distribution

distribution system

system

system

system introduction

introduction

introduction

introduction

1.

Mixing flow.
The outside air is mixed through:

�

Instrument panel air vent

�

Floor air vent

2.

Ventilation.

The outside air comes in through the instrument
panel air vent.
No operation of compressor during ventilation.

3.

Heater.
Air is mostly from floor air vent and a little air is

from defrosting air duct.

4.

Defogging.
Equivalent air from floor air vent and defrosting air

vent.

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Diagnosis

Diagnosis

Diagnosis

Diagnosis and

and

and

and Testing

Testing

Testing

Testing

Leak

Leak

Leak

Leak test

test

test

test

1.

Required tools.
R-134a A/C system dye tracer (24 pcs.).
General purpose 12V leak detector lamp.
Fluorescent dye scavenger.
A/C dye injection tool kit.
Dye cell for replacement.
Electronic leak detector.
Spray bottle with soap water.

2.

Fluorescence leak detector.
IMPORTANT: Be sure to wear dark color goggles

with UV lamp, so the color of dye can be
deepened.
The application of fluorescent dye can facilitate the
detection of leak position in A/C system.

3.

Electronic leak detector.
IMPORTANT: Perform testing in continuous path
to ensure detection of any possible leak. Check
every position of system for leak.

4.

Soap water.
Fill a bottle with solution consisting of 50% water

and 50% detergent.
Run A/C system and spray the soap water onto
connectors and components.
In case of any obvious leak, bubbles shall appear.
This is an ideal method for detecting leak of hoses
and connectors.

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Diagnosis

Diagnosis

Diagnosis

Diagnosis and

and

and

and Testing

Testing

Testing

Testing

A/C

A/C

A/C

A/C system

system

system

system performance

performance

performance

performance testing

testing

testing

testing

1.

Test the vehicle under direct sunlight.

2.

Don’t test the vehicle under airflow obstruction of
condenser, such as the vehicle is parked closely
against wall.

3.

Set the blower motor to the highest speed mode.

4.

External air circulation mode.

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Diagnosis

Diagnosis

Diagnosis

Diagnosis and

and

and

and Testing

Testing

Testing

Testing

A/C

A/C

A/C

A/C system

system

system

system performance

performance

performance

performance testing

testing

testing

testing

5.

Set the cooling temperature to the coldest status.

6.

Open the instrument panel air vent facing right
ahead. Insert the temperature gauge into the panel
air vent center in thickness of 50mm.

7.

Test under idling status.

8.

Both front windows are closed.

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Diagnosis

Diagnosis

Diagnosis

Diagnosis and

and

and

and Testing

Testing

Testing

Testing

A/C

A/C

A/C

A/C system

system

system

system performance

performance

performance

performance testing

testing

testing

testing

9.

The engine hood is closed.

10. Connect the precision pressure gauge to A/C

system.

11. As for the precise testing of humidity (relative

humidity %), the pressure and temperature of air
supply outlet shall vary with humidity (relative
humidity

%).

Please

refer

to

“A/C

System

Performance Table” in this section for details.

12. Shut down the engine. Compare the readings with

data listed in “A/C System Performance Table” and
no big difference can be found under normal
operation of A/C system.

The best status

Normal

In need of maintenance

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- 172 -

Diagnosis

Diagnosis

Diagnosis

Diagnosis and

and

and

and Testing

Testing

Testing

Testing

R

R

R

Refrigerant

efrigerant

efrigerant

efrigerant recovery

recovery

recovery

recovery

1.

Park the vehicle in well-ventilated areas.

2.

Connect to the refrigerant recovery machine.

3.

Turn on the refrigerant recovery machine and select
the refrigerant reclaimer on the control panel.

4.

Open the manual valves at both high-pressure and
low-pressure sides.

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Diagnosis and Testing

Refrigerant recovery

5.

The refrigerant recovery machine shall start to
recover refrigerant and lubricating oil from A/C
system, which respectively flows into a fluid
reservoir and a removable oil reservoir.

6.

Refrigerant recovery machine shall drain all
refrigerant out of A/C system, achieving partial
vacuum of A/C system with pressure at about 34
kPa (10 Hg).

7.

Once partial vacuum is realized, it is recommended
to turn off the refrigerant recovery machine and
two manual valves and record the pressure
readings. If the vacuum reading rises up to positive
pressure in 2 min, there is still surplus refrigerant
(after boiling) in the receiver drier; therefore, you
should continue to execute the reclaimer until no
obvious positive pressure rise occurs.

8.

Check the oil reservoir for oil recovery and record
the recovered volume, for the same volume of oil
shall be added into A/C system later.

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Diagnosis

Diagnosis

Diagnosis

Diagnosis and

and

and

and Testing

Testing

Testing

Testing

A/C

A/C

A/C

A/C System

System

System

System Performance

Performance

Performance

Performance Table

Table

Table

Table

Engine

speed

(r/min)

Relative

humidity

(%)

Ambient air
temperature

Temperature of central

air vent

Pressure at low-pressure

side of pressure gauge

Pressure at high-pressure

side of pressure gauge

°F

℃

°F

℃

psi

kPa

psi

kPa

Idling

speed

20

59

15

37

3.00

27

162

142

943

68

20

37

3.00

31

185

168

1106

77

25

40

4.64

36

209

191

1296

86

30

47

8.60

42

236

225

1494

95

35

54

12.49

50

265

266

1653

104

40

62

16.45

58

300

304

1864

113

45

69

20.47

63

334

323

2155

40

59

15

37

3.00

25

171

139

956

68

20

38

3.50

28

197

164

1129

77

25

44

6.79

32

222

192

1323

86

30

52

11.27

36

252

209

1445

95

35

61

15.94

42

288

248

1709

104

40

69

20.76

48

329

279

1925

113

45

77

25.18

54

375

306

2110

60

59

15

37

3.00

26

177

140

966

68

20

40

4.47

30

205

166

1146

77

25

48

8.92

34

233

192

1326

86

30

57

13.93

39

269

215

1480

95

35

66

19.11

45

310

249

1718

104

40

76

24.59

52

358

300

2072

113

45

86

29.82

59

406

318

2196

80

59

15

37

3.00

27

186

142

976

68

20

43

6.11

31

214

168

1160

77

25

52

11.15

36

250

191

1320

86

30

62

16.95

42

289

225

1551

95

35

74

23.23

50

342

266

1833

104

40

85

29.27

58

398

304

2096

113

45

96

35.65

63

436

323

2226

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Diagnosis

Diagnosis

Diagnosis

Diagnosis and

and

and

and Testing

Testing

Testing

Testing

A/C

A/C

A/C

A/C System

System

System

System Performance

Performance

Performance

Performance Table

Table

Table

Table

℃

℉

kPa

psi

℃

℉

kPa

psi

Definition: This table lists the pressure of refrigerant 134a under different temperature. For example, under room temperature of 26.6
℃ (80°F), the pressure of refrigerant reservoir reaches 595.6 kPa (86.4 psi). If the refrigerant is heated up to 51.6℃ (125°F), the
pressure shall rise up to 1278.8 kPa (185.5 psi). You can also determine the boiling point of refrigerant 134a based on different
pressure. For example, under the pressure of 188.2 kPa (27.3 psi), the boiling point of refrigerant R134a is 0℃ (32°F).

15.5

60

392.3

56.9

-23.3

-10

12.4

1.8

18.3

65

438.2

63.6

-20.5

-5

27.0

3.9

21.1

70

487.3

70.7

-17.7

0

43.2

6.3

23.8

75

539.7

78.3

15.0

5

60.8

8.8

26.6

80

595.6

86.4

-12.2

10

80.1

11.6

29.4

85

655.1

95.0

9.4

15

101.3

14.7

32.2

90

718.5

104.2

-6.6

20

124.3

18.0

35.0

95

785.6

113.9

-3.8

25

149.4

21.7

37.7

100

856.9

124.3

-1.1

30

176.6

25.6

40.5

105

932.3

135.2

0.0

32

188.2

27.3

43.3

110

1012.1

146.8

1.6

35

206.2

29.9

46.1

115

1096.4

159.0

4.4

40

238.0

34.5

48.8

120

1185.2

171.9

7.2

45

272.5

39.5

51.6

125

1278.8

185.5

10.0

50

309.5

44.9

54.4

130

1377.3

199.8

12.7

55

349.4

50.7

60.0

140

1589.6

230.5