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Leakage and vacuum test
Leakage test
Execute the leakage test in the same criteria as MULTI
Leakage test is done by apply nitrogen gas at 3.8MPa (38.7kgf/cm
picture for the test method. (Test with the service valve closed and pressurize the liquid and gas
pipe.)
After the nitrogen gas is pressurized, the pressure must not drop for 24 hours.
Vacuum test
Execute the vacuum test in the same criteria as MULTI
As shown in the below picture, close the service valve of the outdoor unit with the vacuum pump and execute the
vacuuming process on the connecting pipe and AHU from the service port of the stop valve. (Liquid and gas pipe
must always be vacuumed from the service port.)
When the vacuum level reaches 5 Torr, additionally vacuum for 1 hour, and the vacuum level must not change for 1 hour.
(If there is any change, there should be moisture or leakage within the pipe.)
If there is a possibility of moisture within the pipe, vacuum for 2 hours and insert the nitrogen gas at 0.05Mpa
(0.5kgf/cm
3
).
After this vacuum for another 1 hour to reach 5 Torr. Maintain the vacuum for 1 hour and check for changes in vacuum gauge.
* Never purge the air with the refrigerant.
* Always execute the vacuuming with the vacuum pump with vacuum gauge attached.
Low
High
pressure
pressure
Low
High
pressure
pressure
V
leakage test.
TM
3
). Refer to the following
Ⓐ Nitrogen gas
Ⓑ Indoor unit direction
Ⓒ Manifold gauge
Ⓓ Low pressure side handle
Ⓔ High pressure side handle
Ⓕ Service valve
Ⓖ Gas pipe
Ⓗ Liquid pipe
Ⓘ Outdoor unit
Ⓙ Service port
V
vacuum test.
TM
Ⓐ Manifold gauge
Ⓑ Low pressure side handle
Ⓒ High pressure side handle
Ⓓ Service valve
Ⓔ Liquid pipe
Ⓕ Gas pipe
Ⓖ Service port
Ⓗ 3 way joint
Ⓘ Valve
Ⓙ Valve
Ⓚ R410A cylinder
Leakage and vacuum test
Ⓛ Weight: Use a
gravitational weight
(Use one that can
measure up to 0.1kg)
If you cannot get a
high precision
weight, you can also
use the charging
cylinder.
Ⓜ Vacuum pump
Installation Manual 15
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