AGL_HP_VS_YHV2P_E_Rev0 23
Figure 22: Discharge temperature sensor mounting
4.6 High-potential testing
WARNING
High potential testing in a potentially flammable atmosphere! Fire hazard!
Make sure the atmosphere is non-flammable before performing high potential
testing. Do not perform any high potential test when the compressor is charged
with flammable refrigerant.
CAUTION
Internal arcing! Motor destruction! Do not carry out high-voltage or
insulation tests if the compressor housing is under vacuum.
Emerson subjects all scroll compressors to a high-voltage test after final 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 be done for any reason, it shall not be
made with the compressor charged with refrigerant. Carry out 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 compressors, as such tests can induce an electrical arc and cause a fire hazard.
For the same reason, compressors removed from a system with A2L 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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