Engine JAC HFC4DA1-2C. Manual - part 94

AT

AT

AT

AT Air

Air

Air

Air Conditioner

Conditioner

Conditioner

Conditioner

- 165 -

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.

AT

AT

AT

AT Air

Air

Air

Air Conditioner

Conditioner

Conditioner

Conditioner

- 166 -

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.

AT

AT

AT

AT Air

Air

Air

Air Conditioner

Conditioner

Conditioner

Conditioner

- 167 -

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.

AT

AT

AT

AT Air

Air

Air

Air Conditioner

Conditioner

Conditioner

Conditioner

- 168 -

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.