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Refrigerant pipe installation
Performing air tightening test
X
X
Use tools for R410A only to prevent the inflow of foreign substances and to resist the internal pressure .
X
X
Use dry Nitrogen gas to do an airtight test as below .
Apply pressure to the liquid side pipe, gas
side pipe with Nitrogen gas of 4 .1 MPa (gauge
pressure), 595 psig .
If you apply pressure more than 4 .1 MPa (gauge pressure), 595 psig .,
the pipes may be damaged . Apply pressure using pressure regulator .
Continue to apply pressure for minimum
24 hours to check if the pressure drops .
After applying Nitrogen gas, check the change of pressure using
pressure regulator .
If the pressure drops, check if there is a gas leak .
If the pressure is changed, apply soapy water to check the leak .
Check the pressure of the gas again .
Maintain 1 .0 MPa (gauge pressure), 145 psig of
the pressure before performing vacuum drying
and check for further gas leak .
After checking first gas leak, maintain 1 .0 MPa (gauge pressure),
145 psig to check for further gas leaks .
Nitrogen gas
• If the joint of high pressure side is disconnected and the nitrogen gas come into contact with human body, injury
may occur . Tighten the joint connection firmly to prevent dangerous situation .
CAUTION
DVM S Eco_IM_03408A-05_EN.indd 24
2016-11-11 오후 1:27:53
