WARNING All field wiring and components must be installed by a licensed electrician and must comply
with relevant European and national regulations.
The field wiring must be carried out in accordance with the wiring diagram supplied with the unit and
the instructions given below.
Be sure to use a dedicated power circuit. Never use a power supply shared by another appliance.
12.1 Power circuit and cable requirements
1. The electrical power supply to the unit must be arranged so that it can be switched on or off independently of
the electrical supply to other items of the plant and equipment in general.
2. A power circuit must be provided for connection of the unit. This circuit must be protected with the required safety
devices, i.e., a circuit breaker, a slow blow fuse on each phase and an earth leak detector. Recommended fuses
are mentioned on the wiring diagram supplied with the unit.
WARNING Switch off the main isolator switch before making any connections (switch off the circuit
breaker, remove or switch off the fuses).
12.2Connection of the water-cooled water chiller power supply
1. Install cable gland to proper tight main power supply cable
2. Using the appropriate cable, connect the power circuit to the N, L1, L2 and L3 terminals of the unit (cable
section 2.5~ 16mm2).
3. Connect the earth conductor (yellow/green) to the earthing terminal PE.
12.3 Point for attention regarding quality of the public electric power supply
• This equipment complies with EN/IEC 61000-3-11 provided that the system impedance Zsys is less
than or equal to Zmax at the interface point between the user's supply and the public system. It is the
responsibility of the installer or user of the equipment to ensure, by consultation with the distribution network
operator, if necessary, that the equipment is connected only to a supply with a system impedance Zsys
less than or equal to Zmax.
Table 5- Impedance Z
• Only for EWWQ014~064: Equipment complying with EN/IEC 61000-3-12
12.4 Interconnection cables
• Voltage free contact
The PCB is provided with some voltage free contacts to indicate the status of the unit. These voltage free contacts can
be wired as described on the wiring diagram.
• Remote inputs
Besides the voltage free contacts, there are also possibilities to install remote inputs.
They can be installed as shown on the wiring diagram.
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