21
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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
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 side
Low pressure side
Nitrogen
gas
Pressure adjustment
valve (mandatory)
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
Refrigerant piping work
