Motor Insulation; Motor Protection; High Potential Testing - Emerson Copeland Scroll YH04K1E Application Manuallines

The terminal box is IP54 for all YH*K1E compressors.
Figure 16: IP54 T-Box and correct electrical installation with cable gland
4.3

Motor insulation

The motor insulation material is class "B" (TFMN) within maximum allowable operating temperatures
according to IEC 34-1 or DIN 57530.
4.4

Motor protection

Independently from the internal motor protection, fuses must be installed before the compressor. The
selection of fuses has to be made according to EN 60269-1 or EN 60204-1 and compressor
maximum operating current (MOC). Not installing fuses before the compressor or selecting
inappropriate fuses may result in compressor failure.
4.5

High potential testing

WARNING
High potential testing in a 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.
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 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 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. However, if it is needed 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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