Installing the air conditioner
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.
Manifold gage
Low pressure side High pressure side
Nitrogen | Vacuum |
gas | 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
Before vacuuming | Changes in pressure gage after 5 minutes of vacuuming | |||||||||||
When there's moisture | When there is no moisture | |||||||||||
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| 0 | ˚F |
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| 0 | ˚F |
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| 0 | 76 | ˚F | |
| 76 | 35 |
| 76 | 35 |
| 35 | |||||
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0 | 30 |
| 0 | 30 |
| 0 | 30 |
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ENGLISH-56
PAC MIRAGE