Daewoo MUSSO Service Manual page 1287

4. After the high pressure gauge reading drops below 3.5kg/
cm2 , slowly open the low pressure valve.
5. When both high and low pressure gauges reading drops to
0 kg/cm, discharging is completed.
Evacuating Refrigeration System
1. Connect the manifold gauge to the charging valves.
2. Connect the center hose of the gauge to the vacuum pump.
3. Run the vacuum pump and open both high and low pressure
hand valves.
4. Run the vacuum pump 15-20 minutes.
5. Check that both high and low pressure gauge reading is
more than (-) 750mmHg of vacuum and close both valves.
6. Stop the vacuum pump and wait about 5 minutes.
7. After 5 minutes, check that low pressure gauge reading is
changed or not.
8. If low pressure gauge reading is changed, check the system
for leaks and repair as necessary and repeat steps from
'1' to '7'.
9. If there are no changes in low pressure gauge reading,
disconnect the vacuum pump.
Check for Refrigerant Leaks
1. Connect the center hose of the gauge to the refrigerant
tank.
2. Open the high pressure valve of the gauge to charge with
refrigerant gas.
3. Charge until the low pressure gauge reads 1.0kg/cm and
close the valve.
4. Using a gas leak detector, check the system for leaks.
5. If a leak is found, replace a O-ring or repair the faulty
connection
MANUAL & SEMIAUTO-HVAC 7B/C-11
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