Installation SiE33-102
28 General Information
Checking for Leaks [Check 1] (Where pressure falls while carrying out Steps 1 to 3 described on previous page)
Check by ear......Listen for the sound of a major leak.
Check by hand......Check for leak by feeling around jointed sections with hand.
Soap and water check (∗Snoop)......Bubbles will reveal the presence of a leak.
[Check 2] (When searching for a minor leak or when there has been a fall in pressure while the system has
been fully pressurized but the source of the leak cannot be traced.)
1. Release the nitrogen until the pressure reaches 0.3MPa.
2. Increase pressure to 1.5MPa using gaseous flon gas (R-22). (Nitrogen and refrigerant gas mixed)
3. Search for the source of the leak using a detector such as a halide torch or a propane or electric
detector.
4. If the source of the leak still cannot be traced then repressurize with nitrogen up to 2.8MPa and check
again. (The pressure must not be increased to more than 2.8MPa.)
Important points
1. Where the lengths of piping involved are particularly long then the air tight test should be carried out
block by block.
Example:
1. Indoor side
2. Indoor side + vertical pipes
3. Indoor side + vertical pipes + outdoor side
Si33-102.book Page 28 Tuesday, June 26, 2001 3:18 PM
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