LG GHP SUPER - Leak Detection

38
LEAK DETECTION
ENGLISH
Ⓐ Nitrogen gas
Ⓑ To indoor unit
Ⓒ Manifold gauge
Ⓓ Low pressure side handle
Ⓔ High pressure side handle
Ⓕ Liquid pipe
Ⓖ Gas pipe
Ⓗ Service port
Ⓘ To outdoor unit
Liquid pipe
Gas pipe
IDU
Nitrogen gas
cylinder
Slave outdoor unit Master outdoor unit
Liquide pipe
Gas pipe
Liquide pipe
Gas pipe
Liquid side
Gas side
Part connected
to the indoor unit
Close
Close
Close
Close
If pressurized high
pressure nitrogen gas,
The regulator must be
used.
Precautions to take during series installation
• Use a vacuum pump or Inert (nitrogen) gas when performing leak detection or air purge.
Do not use compressed air or oxygen, or inflammable gas. There is a risk of fire or explo-
sion.
There is a risk of death, injury, fire, or explosion.
WARNING
!
LEAK DETECTION
Leak detection should be made by pressurizing nitrogen gas to 3.8 MPa(38.7 kgf/cm
2
). Refer to
the diagram as follows. (Make a detection test with the service valve closed. Be sure to pressur-
ize the liquid pipe and the gas pipe.)
The test result can be judged good if the pressure has not been reduced for 24 hours after the
nitrogen gas pressurization.