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Refrigerant piping work
Performing the refrigerant gas leak test
f Use a manifold gauge for R-410A to prevent the inflow of foreign substances and resist against the internal pressure .
f
f Pressure test with dry oxygen free nitrogen only .
f
Apply pressure to the liquid side pipe and gas side
pipe with Nitrogen gas of 4 . 1 MPa (41 . 8 kgf/cm²)
Keep it for minimum 24 hours to check if the
pressure drops .
If the pressure drops, check if there is gas leak .
Maintain 1 . 0 MPa of the pressure before performing
vacuum drying and check further gas leak .
Low pressure side
Service port
❋ ❋ Make sure to use a recommended bubble test solution for Gas Leak Test . Soap water could cause cracking of the flare
nuts or lead to corrosion of flared joints .
• You may get injured when the joint on the high pressure side detaches and the gas comes in contact with your
body . Make sure to tighten the joint to prevent such accidents .
CAUTION
Manifold gauge
High pressure side
Gas side
pipe
Liquid
side pipe
If you apply pressure more than 4 . 1 MPa, 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 Nitrogen gas again .
After checking first gas leak, maintain 1 . 0 MPa to check further gas
leak .
Pressure adjustment
valve (mandatory)
Nitrogen gas
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