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・When expanding the on-site piping, satisfy the minimum insertion depth requirement as follows.
Pipe size [mm (in)]
ø5 (ø1/4) or more, less than ø8 (ø13/8)
ø8 (ø13/8) or more, less than ø12 (ø1/2)
ø12 (ø1/2) or more, less than ø16 (ø11/16)
ø16 (ø11/16) or more, less than ø25 (ø1)
ø25 (ø1) or more, less than ø35 (ø1-7/16)
ø35 (ø1-7/16) or more, less than ø45 (ø1-13/16)
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.
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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 liquid and gas 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.
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WT07281X03
Ⓐ
Example of closure materials (not supplied)
Ⓑ
Fill the openings
Ⓑ
Ⓑ
Ⓑ
Ⓒ
HI
LO
Ⓓ
Ⓔ
Minimum insertion depth [mm (in)]
6 (1/4)
7 (5/16)
8 (3/8)
10 (7/16)
12 (1/2)
14 (9/16)
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Nitrogen gas
Ⓕ
Ⓑ
To indoor unit
Ⓖ
Ⓒ
Gauge manifold
Ⓓ
Low pressure knob
Ⓗ
Ⓔ
High pressure knob
Ⓕ
Service valve
Ⓘ
Ⓖ
Liquid piping
Ⓙ
Ⓗ
Gas piping
Ⓘ
Outdoor unit
Ⓙ
Service port
GB-26
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