Electrical Connection; General Recommendations; Electrical Installation - Emerson Copeland ZH04KCU Application Manuallines

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 ZH*KCU 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 in a flammable refrigerant system 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.
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 is only allowed in a non-
explosive atmosphere, for example in an enclosure for ATEX 94/9/CE Zone 2
according to the relevant standard EN 60079.
Recommended wiring diagrams are shown in Figures 15 & 16 next pages.
NOTE: A contactor K2 has to be used for the safety chain to comply with EN 60335 and
EN 60204-1.
NOTE: It is mandatory to install a residual current device (RCD) in any electrical system
associated with ZH*KCU compressors and R290 refrigerant. 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 other electrical accessories.
Figure 14: Residual current device (RCD)
AGL_HP_ST_ZHKCU_EN_Rev01 17