Air Tightness Test - Mitsubishi Electric PUHY-RP200 Service Handbook

[ I Read Before Servicing ]

[6] 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.
1. Items to be strictly observed
ŒPressurize the system with nitrogen to the design pressure (REPLACE MULTI Y(PUHY-RP): 3.3 MPa [479 psi]; REPLACE
MULTI R2 (PURY-RP): 3.6 MPa [523 psi]), and check for refrigerant leakage. Take the temperature fluctuations into account
when measuring pressure.
ŒRefrigerant R410A must be charged in its liquid state (vs. gaseous state).
2. Reasons
ŒOxygen, if used for an air tightness test, poses a risk of explosion. (Only use nitrogen to check air tightness.)
ŒRefrigerant 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
R410A does not contain chloride, so leak detectors for use with older types of refrigerants will not detect an R410A leak. Be
sure to use a leak detector designed for use with R410A.
HWE10010
Halide torch R22 leakage detector
- 7 - GB