AGL_HP_VS_YHV_RG_RT_EN_Rev00 27
4.7 High-potential testing
WARNING
High-potential testing in a flammable or explosive atmosphere! Fire
explosion hazard! Make sure the atmosphere is non-flammable and/or non-
explosive before performing high-potential testing. Do not perform any high-
potential test when the compressor is charged with flammable refrigerant.
WARNING
Conductor cables! Electrical shock hazard!
Shut off power supply before
CAUTION
Internal arcing! Motor destruction! Do not carry out high-
insulation tests if the compressor housing is under vacuum.
Emerson subjects all scroll compressors to a high-voltage test after f inal assembly. Each motor
phase winding is tested according to EN 60034-1 at a differential voltage of 1000 V plus twice the
nominal voltage.
Since high-voltage tests lead to premature ageing of the winding insulation, further additional tests
of that nature are not recommended. However, if it has to b e done for any reason, it shall not be
made with the compressor charged with ref rigerant. Conduct 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 the same reason, compressors removed f rom 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.
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