Air Tightness Test - Mitsubishi Electric PUHY-M200YNW-A1 Service Handbook

[1-3 Working with Refrigerant Piping ]
1-3-2

Air Tightness Test

No changes have been made in the detection method. Note that a refrigerant leak detector for R22 will not detect an R32 leak.
1. Items to be strictly observed
Pressurize the equipment with nitrogen up to the design pressure (4.15MPa[601psi]), and then judge the equipment's air tight-
ness, taking temperature variations into account.
2. Reasons
Oxygen, if used for an air tightness test, poses a risk of explosion. (Only use nitrogen to check air tightness.)
3. Notes
Procure a leak detector that is specifically designed to detect an HFC leak. A leak detector for R22 will not detect an HFC(R32)
leak.
BS_01_G
Halide torch R22 leakage detector
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