Samsung AM***XMDCH Series Installation Manual page 24

Refrigerant pipe installation
Performing air tightening test
Use tools for R410A only to prevent the inflow of foreign substances and to resist the internal pressure.
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.
Continue to apply pressure for minimum
24 hours to check if the pressure drops.
If the pressure drops, check if there is a gas leak.
Maintain 1.0 MPa (gauge pressure), 145 psig of
the pressure before performing vacuum drying
and check for further gas leak.
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
24
If you apply pressure more than 4.1 MPa (gauge pressure), 595 psig.,
the pipes may be damaged. Apply pressure using pressure regulator.
After applying Nitrogen gas, check the change of pressure using
pressure regulator.
If the pressure is changed, apply soapy water to check the leak.
Check the pressure of the gas again.
After checking first gas leak, maintain 1.0 MPa (gauge pressure),
145 psig to check for further gas leaks.
Nitrogen gas