LG RCWW Operation & Maintenance Manual page 79

Machine leak test
• Cases that the leak test is required
- Cases that the leak test is required
- In the case that the pressure of nitrogen injected in the factory during transport is reduced before the initial
startup
• Areas where leakage is expected
- The area where gasket is used
- The area where screws are tightened, bolts, nuts
- Copper tube connection areas
- Sight glass welded areas
- Compressor motor terminals
Leak test method
1) Fill nitrogen gas while conducting the leak test sequentially until the cabin pressure reaches 2 kg/cm
2
9~9.5 kg/cm .
2) Conduct soapy water checks to all connection areas.
3) When the test pressure is kept for 30 minutes, get ready to check small leak areas.
4) Mark the leak areas.
5) Discharge the pressure from the machine.
6) Repair all leak areas.
7) Conduct the leak test again to check the repaired areas.
8) Please increase the cabin pressure to 9~9.5 kg/cm
9) After checking small leak areas, repair the leak areas.
10) Upon completion of the leak test, carefully release the nitrogen gas.
* When you increase the pressure in the chiller, close the valve of evaporator, as the evaporator relief valve may
open.
2
after performing a big leak test
6. Commissioning
79
2 2
, 5 kg/cm , or