Doosan DX225LC, Manual, Page: 109 / 136

Electrical System SP000935
Page 108
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.
LO HI
Figure 94
1
High-pressure: 8.0 - 10.0 kg•cm
2
(114 - 142 psi)
Low-pressure: Approximately 1.0 kg•cm
2
(14 psi)
Possible Cause: Low Refrigerant Level
Step Inspection Item Remedy
1 Check for traces of refrigerant oil.
Yes
Reassemble using correct tightening
torque.
No Go to next step.
2
Using a leak detection device or soapy water
check for refrigerant leakage at all major
components and joints. Yes Repair leaking component.
No Recharge system to correct
pressure.
2
High-pressure: Over 23 kg•cm
2
(327 psi)
Low-pressure: Approximately 2.5 - 3.0 kg•cm
2
(36 - 43 psi)
Possible Cause: Overcharge, Frost on condenser
Step Inspection Item Remedy
1
Check for condenser pin damage or
contamination.
Yes Clean, repair or replace condenser.
No Refrigerant overcharge.
3
High-pressure: Approximately 20 - 25 kg•cm
2
(285 - 356 psi)
Low-pressure: Approximately 2.5 - 3.5 kg•cm
2
(36 - 50 psi)
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 time, replace the receiver dryer.