Doosan DX60R Shop Manual page 865

3
Possible Cause: Air in system.
1. Recover any remaining refrigerant.
2. Vacuum out system.
3. Recharge system.
NOTE:
If the system has been exposed to the air for a long period of time, replace the receiver
dryer.
4
Possible Cause: Refrigerant does not circulate
Step Inspection Item
1. Connect manifold gauge and start
engine.
2. Turn on air conditioner.
3. Set blower switch to "HIGH" position.
4. Turn air conditioner "OFF" and wait 10
1
minutes.
5. Recheck high / low-pressure readings.
High-pressure: 13 - 19 kg/cm
Low-pressure: 1.5 - 3.3 kg/cm
5
Low-pressure: 500 mmHg (Negative Pressure) - Dial indicator needle unstable.
Possible Cause: Moisture in system has iced up the expansion valve.
NOTE: When the absorbed moisture freezes the pressure readings may look normal. Careful
readings should be made to determine whether pressure is in normal range.
1. Recover any remaining refrigerant.
2. Vacuum out system.
3. Recharge system.
NOTE: If the system has been exposed to the air for a long period of time, replace the receiver
dryer.
6
Possible Cause: Refrigerant pressure problem due to defective expansion valve or temperature
sensor.
Step Inspection Item
Inspect whether the temperature sensor is
1
installed properly.
Electrical System
High-pressure: Approximately 20 - 25 kg/cm
Low-pressure: Approximately 2.5 - 3.5 kg/cm
High-pressure: Over 6 kg/cm
Low-pressure: Approximately 760 mmHg (Negative Pressure)
2
(185 - 270 psi)
2
(21.3 - 46.9 psi)
High-pressure: Over 6 - 18 kg/cm
High-pressure: Over 22 - 23 kg/cm
Low-pressure: 2.5 kg/cm
2
(285 - 355 psi)
2
(35 - 50 psi)
2
(85 psi)
Remedy
Moisture in system, replace
Yes
receiver dryer.
Contaminated system, replace
expansion valve.
No
(Replace evaporator core
assembly.)
2
(85 - 256 psi)
2
(313 - 327 psi)
2
(36 psi)
Remedy
Yes Replace expansion valve.
No Exchange duct sensor.
SP001687
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