C6.2.15/0815/E
23
4.5 Low ambient cut-out
A low ambient cut-out is not required to limit air-to-air heat pump operation. Air-to-water heat
pumps must be reviewed since this configuration could possibly run outside of the approved
operating envelope causing overheating or excessive pressure ratio operation.
4.6 High-potential testing
WARNING
Conductor cables! Electrical shock!
Shut off power supply before high-
potential testing.
CAUTION
Internal arcing! Motor destruction!
Do not carry out high-voltage or
insulation tests if the compressor housing is under vacuum.
Emerson Climate Technologies subjects all Scroll compressors to a high-voltage test after final
assembly. Each motor phase winding is tested, according to EN 0530 or VDE 0530 part 1, at a
differential voltage of 1000V 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.
If it has to be done for any reason, a lower voltage must be used. Disconnect all electronic
devices, eg, motor protection module, fan speed control, etc prior to testing.
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