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Mitsubishi Electric TRANE TURYP0723AN40AN Manual De Instalación página 26

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9-5-3. Sealing the openings around the pipes
Seal all openings around pipes and wires to keep out small animals, rainwater, or snow.
- Failure to do so may result in current leakage, electric shock, or damage to the unit.
9-6. Air-tightness test
Do not use oxygen, flammable gas, or a refrigerant containing chlorine for air-tightness testing.
- Doing so may result in an explosion. Chlorine will deteriorate the refrigerant oil.
After refrigerant pipe installation is completed, check the system for leaks by conducting an air-tightness test. If there is a leak, the composition of
the refrigerant will change and the performance will drop.
<Air-tightness test procedures>
① Make sure the service valves are closed.
② Add pressure to the refrigerant pipes through the service ports of the high- and low-pressure pipes.
* Pressurize to the design pressure (4.15 MPa) using nitrogen gas.
③ If the pressure holds for one day and does not decrease, the pipes have passed the test and there are no leaks. If the pressure decreases,
there is a leak. Look for the source of the leak by spraying a bubbling agent (e.g., Gupoflex) on the flared or brazed sections.
④ Wipe off the bubbling agent.
WT09115X03
HI
LO
Example of closure materials (not supplied)
Fill the openings
Nitrogen gas
To indoor unit
Gauge manifold
Low pressure knob
High pressure knob
Service valve
Low-pressure pipe
High-pressure pipe
Outdoor unit
Service port
GB-24

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