Doosan DX700LC Operation And Maintenance Manual page 238

Check Air Conditioner Refrigerant
Mixing of tobacco smoke and freon is deadly.
Do not smoke
air-conditioning system.
1. Run engine at about 1,800 rpm. Operate for a minimum of
ten minutes to stabilize the system.
2. Press the "HI" fan speed switch to set maximum air flow.
3. Put the temperature control switch in maximum cooling
position.
4. Press the "Internal Air Circulation" switch.
5. Compare the flow of bubbles in the sight glass of receiver
dryer with the drawings in the following table.
Overfilling refrigerant
high-pressure and poor cooling action; and low
refrigerant level may cause compressor damage.
Always maintain refrigerant at normal level.
Amount of
Refrigerant
Normal
High
Low
Check and Adjust Engine **
Contact your nearest DOOSAN dealer.
Engine dealer for checking and adjusting the following items:
• Engine Compression Pressure.
• Injection Pressure.
• Injection Timing.
Inspection, Maintenance and Adjustment
4-50
WARNING
while servicing or
CAUTION
may cause
Appearance of the Sight Glass
Almost clear.
Any bubbles disappear.
No bubbles are seen.
A flow of bubbles is visible.
recharging
Figure 89
dangerous
Solutions
Charge or withdraw the system with
the correct amount of HFC-134a
refrigerant.
FG016137
OP001123