Air Tightness Test - Mitsubishi Electric PURY-P72 Service Handbook

[I Read Before Servicing]
[7] Air Tightness Test
No changes have been made in the detection method. Note that a refrigerant leak detector for R22
will
not detect an R410A leak.
Halide torch R22 leakage detector
1.
Items to be strictly observed
t Pressurize the equipment with nitrogen up to the design pressure (4. 15MPa[601 psij), and then judge the equipment's air tight-
ness, taking temperature variations into account.
tRefrigerant R410A must be charged in its liquid state (vs. gaseous state).
2.
Reasons
t Oxygen , if used for an air tightness test, poses a risk of explosion. (Only use nitrogen to check air tightness.)
tRefrigerant R410A must be charged in its liquid state. If gaseous refrigerant in the cylinder is drawn out first, the composition
of the remaining refrigerant in the cylinder
will
change and become unsuitable for use.
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(R410A) leak.
HWEOB03A
- 9-
GB