43
13. Installation
AF50MS3AF50MS3MCEEXHC, AF50MV3AF50MV3MCEEXHC
Vacuuming, gas leak test and charging additional refrigerant
Air tightness test and vacuuming
Use Nitrogen gas for air tightness test as shown in the illustration.
Nitr
ogen gas
High pressure side
Low pressure side
Manifold gage
Vacuum
pump
1.
Execute air tightness test with nitrogen gas at pressure over 0.2 MPa and below 4.1 MPa. If you apply pressure at over
4.1 MPa, pipes may get damaged. Therefore, apply pressure with pressure regulator and pay attention to the pressure
of the nitrogen.
2. After applying Nitrogen gas, check there's any change of pressure, using a pressure regulator.
3. Check for leakage at connection part and brazed part by using soap water.
4. When there's no leakage, open the manifold gage to discharge nitrogen and connect the vacuum pump to the
manifold gage.
5.
Perform vacuuming for over 30 minutes by using vacuum pump so that pressure is below -0.1006 MPa on the pressure
regulator.
-
Use a vacuum pump that is at least 140 ℓ/min in capacity and make sure that vacuuming timing must be
longer when piping gets longer.
-
Pressure will not drop even after 5 minutes of vacuuming when there's moisture within the pipe. In this case,
execute nitrogen blowing again before executing vacuuming.
Before vacuuming
Changes in pressure gage after 5 minutes of vacuuming
When there's moisture
When there is no moisture
0
0
30
76
35
˚C
˚F
0
0
30
76
35
˚C
˚F
0
0
30
76
35
˚C
˚F