Installing the Refrigerant Pipe Work
(Continued)
Performing the Refrigerant Gas Leak Test
Use a manifold gauge for R410A to prevent the inflow of foreign substances and resist against the
internal pressure.
Pressure test with dry oxygen free nitrogen only.
Apply pressure to the liquid side pipe and
gas side pipe with Nitrogen gas of
4.1 MPa (41.8 kgf/cm²)
If you apply pressure more than 4.1MPa, the pipes may
be damaged.
Apply pressure using pressure regulator.
Keep it 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 gas leak.
If the pressure is changed, apply soapy water to check
the leak. Check the pressure of the Nitrogen gas again.
Maintain 1.0MPa of the pressure before
performing vacuum drying and check further
gas leak.
After checking first gas leak, maintain 1.0MPa to check
further gas leak.
Manifold gauge
High pressure sideLow pressure side
Nitrogen gas
Gas side pipe
Liquid side pipe
Service port
Pressure adjustment
valve (mandatory)
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.
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