Carel Heez Technical Leaflet page 54

ENG
section of the earth wire must be greater than or equal to the cross-section of the phase wires; earth impedance must
be compliant with national and local regulations; in compliance with UL requirements, protective earth connections
must be made using a terminal with ring connector. Connect the power wires to terminals L1 and N; for the cross-
sections of the wires and the type of circuit breaker (MCB), see "Technical specifications".
Caution:
do not connect power to terminals U, V, W.
Compressor
To ensure conformity to the EMC directive it may be necessary to use a ferrite and/or a shielded cable with foil +
braid. The cable can also be installed in steel and copper conduits. In this case, it is recommended to install the ferrite
core (for example Fair-Rite 2631102002) around the U, V, W wires and excluding the earth wire, located between the
shield earth and the connector. The shield is fully earthed via a metal clamp at both ends of the cable, as close as
possible to the controller's terminals. In the event where the shield is connected to the earth spade on the controller
(not recommended), the connection should be made by twisting the shield. The twisted section must be as short as
possible, and the length must not exceed five times the width. Earth the compressor via its metal casing.
Fig. 3.o
Compressor electrical connections
See document +030222170 available on ksa.carel.com and the Heez system manual +0300052EN.
Caution:
•
do not reverse the compressor phases;
•
do not install a circuit breaker between the drive and the compressor.
Fans
Heez can control direct current (DC) or alternating current (AC) fans. DC fans are powered directly by the controller.
Caution:
outputs J3 and J4 are designed to deliver a maximum total power, as specified in the technical data
table; in the event of higher power output for an extended time, the controller may be damaged. It is therefore
necessary to make sure that the connected DC fans have a lower total power input in all operating conditions (see
the table of technical specifications).
Bottle cooler
All the unit's metal components must be adequately connected to the PE. Metal parts must be coupled together
via adjoining, unpainted points of contact, to ensure good electrical continuity. It is recommended to install the
controller inside the condensing unit and to shield the entire unit. Any wiring leaving the shielded section must be
suitably shielded, for example using shielded cables or metal conduits. In some cases, the use of ferrites on the wires
leaving the shielded section may be sufficient.
22
Schermo treccia Schermo nastro
Braid shield Tape shield
U
V
W
PE
Heez +050002745 rel. 1.2 - 16.11.2021