ENGLISH-30
Refrigerant piping w
o
rk
Perf
o
rming the refrigerant gas leak test
f
Use a manifold gauge for R-410A to prevent the in
fl
ow 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/cm
²
)
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
fi
rst gas leak, maintain 1.0MPa to check further gas
leak.
Manifold gauge
High pressure side
Low pressure side
Nitrogen gas
Pressure adjustment
valve (mandatory)
Gas side
pipe
Liquid
side pipe
Service port
❋
Make sure to use a recommended bubble test solution for Gas Leak Test. Soap water could cause cracking of the
fl
are
nuts or lead to corrosion of
fl
ared 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
