Engine JAC HFC4DA1-2C. Service 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.
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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.
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