Electrical Connections; Installation Precautions; Electrical Connection Overview - Fujitsu WATERSTAGE 112 Maintenance Document

Heat Pump, Split System, Single Service, 3 phase
2.3

Electrical Connections

2.3.1 Installation Precautions

All machines in the ATW Split System Inverter range
are designed to operate at 3x400V 50Hz. Power
supplies must be compliant with NFC 15-100. The
power supply contract must be able to cover not only
the power of the unit but also the sum of powers of all
the devices likely to operate at the same time.

2.3.2 Electrical Connection Overview

Block diagram of electrical connections for a simple installation: one zone, no boiler backup or DHW
Two connections to the electrical panel:
•
Heat pump general power supply on the outdoor
unit
•
Electric auxiliary power supply on the Hydraulic
Unit
14
> Warning !
Cable cross-sections and protection ratings
are given for information only. The installation
technician should always check that these
components are in line with the maximum
current ratings and the standards applied on
the installation premises
Protections will be of the omnipolar, D curve circuit
breaker type, with a contact opening distance of at
least 3 mm. Lines will be made of HO7 RNF cable or
similar. Provide a 300 mA maximum, differential
protection line-end in compliance with the current
standards. Under no circumstances (including during
startup periods) may the voltage across the unit drop
below 198V or rise above 264V. Do not use a power
outlet as the power supply.
<
Interconnection between the Hydraulic Unit and the
outdoor unit.
Connection of the outdoor sensor and the room
thermostat.
Maintenance Document 1394-1