AGL_Ref_ST_YBK1E_EN_Rev01
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4
Electrical connection
4.1
General recommendations
The compressor terminal box has a wiring diagram on the inside of its cover. Before connecting the
compressor, ensure the supply voltage, the phases and the frequency match the nameplate data.
For saf ety reasons, Emerson recommends that the electrical installation be executed in compliance
with standard EN 60204-1 and/or other standards and regulations of application.
When installing YB*K1E compressors in a system, the following measures must be taken:
▪
To ensure the wires are properly terminated, the correct terminal and clamping tool f or the
selected wire size must be used.
▪
The ground wiring must conform to local regulations and codes of practice (only the provided
parts must be used).
▪
The grounding screw must be torqued to 2.4 to 2.6 Nm.
▪
A cable strain-relief device must be added.
▪
Cable and wires must be protected against sharp edges.
4.2
Electrical installation
WARNING
Conductor cables! Electrical shock hazard!
Shut off power supply before
undertaking any task on electrical equipment.
WARNING
Ignition source in a potentially flammable atmosphere! Fire hazard!
In
applications with A2L ref rigerants, the electrical connection of the scroll
compressors is not an ignition source during normal operation but could
become one if not installed properly according to installation instructions.
Ensure correct mechanical and electrical installation.
System capacitors may remain charged f or several minutes af ter shutdown.
Bef ore starting to work on the electrical installation make sure sparking is not
possible. Continuously check if the ambient atmosphere is non-f lammable
when working on the electrical installation.
WARNING
Run capacitors! Sparking in a potentially explosive atmosphere!
Explosion hazard!
Single-phase compressors must be electrically connected
to a run capacitor. Run capacitors have a potential ignition source and do not
comply with ATEX requirements. The installation of A2L ref rigerant systems
is only allowed in non-explosive atmospheres, for example in an enclosure for
ATEX 94/9/CE Zone 2 according to the relevant standard EN 60079.
For recommended wiring diagrams, see
Figures 14 & 15
next pages.
NOTE: A contactor K2 has to be used for the safety chain to comply with EN 60335 and
EN 60204-1.
NOTE: A residual current device (RCD) can be used for additional protection in electrical
systems associated with YB*K1E compressors and A2L flammable refrigerants such as
R454C and R1234yf. The purpose of the RCD is to detect current leaks to the ground in case
of electrical issues, for example with the terminal connections or electrical accessories.
Figure 13: Residual current device (RCD)
