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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 safety 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 YRH(V)*KTE/KTG compressors in a system, the following measures must be taken:
▪ To ensure the wires are properly terminated, the correct terminal and clamping tool for 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! 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 for several minutes after shutdown.
Before starting to work on the electrical installation make sure sparking is not
possible. Continuously check if the ambient atmosphere is non-flammable
when working on the electrical installation.
For recommended wiring diagrams, see Figure 14 next page.
NOTE: A contactor K2 has to be used for the safety chain to comply with EN 60335 and
EN 60204-1.
NOTE: For A3 refrigerant (R290) applications, it is mandatory to install a residual current
device (RCD) in any electrical system associated with YRH(V)*KTG compressors used.
For A2L refrigerant (R454C) applications, a residual current device (RCD) can be used for
additional protection. In both instances, the purpose of the RCD is to detect current leaks to
the ground in case of electrical issues, for example with the terminal connection pins or
electrical accessories.
Figure 13: Residual current device (RCD)
14
AGL_AC_ST_YRH_EN_Rev01
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