18
AGL_AC_ST_YRH_EN_Rev01
Since high-voltage tests lead to premature ageing of the winding insulation, additional tests of that
nature are not recommended. However, if such a test has to be done for any reason, it shall not be
conducted with the compressor charged with refrigerant. Run the test with a lower voltage, as
described above. Disconnect all electronic devices, eg, motor protection module, fan speed control,
etc prior to testing.
Special attention should be paid when performing a high-potential test and reading the Megohm
resistance on A2L and A3 compressors, as such tests can induce an electrical arc and cause a fire
hazard.
For this reason, compressors removed from a system with A2L or A3 refrigerant will need to have
the oil drained and a nitrogen purge introduced to flush any remaining refrigerant from the
compressor prior to high-potential testing and Megohm resistance reading.
