Doosan DX225LC, Manual

Page: 115 / 136

Electrical System SP000935
Page 114
Refrigerant Recovery
1. Attach the manifold gauges and the refrigerant recovery
unit to the refrigerant lines as shown.
NOTE:
Be careful not to switch the connections for the
low and high-pressure valves.
2. Open the high-pressure valve slowly to release the
refrigerant to the recovery unit.
NOTE:
Open the valve slowly, while checking to see
that refrigerant is not leaking out.
3. When the manifold gauge dial falls below 3.5 kg•cm
2
(50 psi), slowly open the low-pressure valve.
4. Open both the high and low-pressure valves slowly until
the manifold gauge dials indicates 0 kg•cm
2
(0 psi).
Vacuuming Refrigerant System
1. Vacuuming Procedure
NOTE:
When the A/C system has been exposed to the
air, it must be vacuumed out. Perform vacuum
process for 30 minutes for complete moisture
and air evacuation.
A. Attach the manifold gauges and vacuum pump to the
refrigerant system as shown.
B. Turn on the vacuum pump and open both valves.
C. When the low-pressure gauge shows approximately
710 mmHg, close both valves and turn off vacuum
pump.
1
2 3
4
5
HDA6067L
Figure 97
Reference
Number
Description
1 To Compressor
2 Low-pressure Side
3 High-pressure Side
4 From Receiver
5 Refrigerant Recovery Tank
1
2 3
4
5
HDA6068L
Figure 98
Reference
Number
Description
1 To Compressor
2 Low-pressure Side
3 High-pressure Side
4 From Receiver
5 Vacuum Pump