Troubleshooting - Doosan DX140R Shop Manual

TROUBLESHOOTING

Refrigerant Pressure Check
1. Open all doors and windows.
2. Install manifold gauge set.
3. Start engine and maintain engine speed at 1,800 - 2,000
rpm.
4. Check high / low-pressure of refrigerant.
1
Possible Cause: Low Refrigerant Level
Step Inspection Item
1 Check for traces of refrigerant oil.
Using a leak detection device or soapy water
check for refrigerant leakage at all major
2
components and joints.
2
Possible Cause: Overcharge, Frost on condenser
Step Inspection Item
Check for condenser pin damage or
1
contamination.
3
Possible Cause: Air in system.
1. Recover any remaining refrigerant.
2. Vacuum out system.
3. Recharge system.
If the system has been exposed to the air for a long period of time, replace the receiver dryer.
NOTE:
Electrical System
Page 94
High-pressure: 8.0 - 10.0 kg/cm
Low-pressure: Approximately 1.0 kg/cm
High-pressure: Over 23 kg/cm
Low-pressure: Approximately 2.5 - 3.0 kg/cm
High-pressure: Approximately 20 - 25 kg/cm
Low-pressure: Approximately 2.5 - 3.5 kg/cm
LO
Figure 84
2
(114 - 142 psi)
2
(14 psi)
Remedy
Reassemble using correct tightening
Yes
torque.
No Go to next step.
Yes Repair leaking component.
No Recharge system to correct
pressure.
2
(327 psi)
2
(36 - 43 psi)
Remedy
Yes Clean, repair or replace condenser.
No Refrigerant overcharge.
2
(285 - 356 psi)
2
(36 - 50 psi)
HI
HDA6074L
SP001949