87
ENGLISH
Air tightness test and vacuum drying
Air tightness test
ॷ Ƹϑʪϩͱͱ̷ϑ˙ͱθŵࣛߦߣߢϩͱΧθʪЭʪ͝ϩϩ˵ʪ̈͝Ѥͱиͱ˙˙ͱθʪ̈˝͝ϑЇɵϑϩɇ͝ʀʪϑɇ͝ʒθʪϑ̈ϑϩɇ˝ɇ̈͝ϑϩϩ˵ʪ̈͝ϩʪθ͝ɇ̷ΧθʪϑϑЇθʪ
ॷ Uͱ͝ͱϩθʪ͔ͱЭʪϩ˵ʪʀͱθʪͱ˙ѣ̷̷̈͝˝Χͱθϩ
ॷ
Use Nitrogen gas for air tightness test as shown in the illustration.
H/P
H/R
Manifold gage
High
pressure side
Low pressure side
Filling
port
Gas
pipe
Liquid pipe
Nitr
ogen gas
Service valve
Manifold gage
High
pressure
side
Low pressure side
Filling
port
Gas
pipe
High pressure
gas pipe
Nitr
ogen gas
Service valve
Liquid
pipe
Apply pressure to the liquid side pipe and gas side
pipe (when installing outdoor units in module)
with Nitrogen gas at 4.1MPa.
If you apply pressure at more than 4.1MPa, pipes may
get damaged. Apply pressure with pressure regulator
and pay attention to the pressure of the nitrogen.
Keep it for minimum 24 hours to check if pressure
drops.
After applying Nitrogen gas, check there's any change of
pressure, using a pressure regulator.
If the pressure drops, check for gas leakage.
If the pressure is changed, apply soap water to check for
leakage and check the pressure of the nitrogen gas again.
Maintain 1.0MPa of the pressure before
performing vacuum drying and check for further
gas leakage.
˙ϩʪθʀ˵ʪʀ̧̈͝˝ϩ˵ʪѣθϑϩ˝ɇϑ̷ʪɇ̧ɇ˝ʪࡥ͔ɇ̈͝ϩɇ̈͝ߣߢđťɇϩͱ
check for further gas leakage.
࡛
Perform a Nitrogen gas leak test with the service valve of the outdoor unit closed.
࡛Ǯ˵ʪ͝ʀ˵ɇθ˝̈͝˝ϩ˵ʪ̈͝ϩθͱ˝ʪ͝˝ɇϑࡥʀ˵ɇθ˝ʪ̈ϩ˙θͱ͔ϩ˵ʪɵͱϩ˵࣑˵̈˝˵̷࡛ͱиΧθʪϑϑЇθʪ࣒ϑ̈ʒʪϑ
࡛Ã˙ϩ˵ʪΧ̈Χʪ̈ϑѣ̷̷ʪʒ̈͝ɇϑ˵ͱθϩϩ͔̈ʪӥϩ˵ɇ˵̈˝˵̷цʪуʀʪϑϑ̈ЭʪΧθʪϑϑЇθʪͱ˙Ę̈ϩθͱ˝ʪ͝˝ɇϑࡥϩ˵ʪΧ̈Χʪϑ͔ɇц
get damaged. Make sure to use a regulator to prevent the high pressure Nitrogen gas, over 4.1MPa,
from entering into the pipe.
CAUTION
