Daikin UATYQ20ABAY1, Installation, Use And Maintenance Manual

Page: 26 / 44

Translation from original instructions
Installation manual
26
We reserve the right to make changes without any prior notice.
UATYQ*Y1
Packaged Rooftop
4P522680-1
5.4 Electrical connections
All electrical operations must be carried out by personnel having the necessary legal requirements, and trained and
informed on the risks connected with these operations.
The sizing and characteristics of the power lines and relevant components must be determined by staff qualified to
design electrical systems, following the international and national regulations of the place of installation of the units
in conformity with the regulations in force at the time of installation.
To install components outside the unit, you must refer to the wiring diagram supplied with the unit.
The wiring diagram, along with the manuals, must be kept carefully and made available for future work on the unit.
Overview:
- The electrical connections must comply with the information shown in the wiring diagram attached to the unit and
the regulations in force in the place of installation.
- grounding is required by law;
- The installer must connect the earth cable to the PE terminal on the earth bar situated in the electrical control
panel.
- Make sure the power supply voltage corresponds to the rated data of the unit (voltage, number of phases,
frequency) stated on the plate on the unit.
- The standard supply voltage (see specific wiring diagram) must not fluctuate by more than ±10% and the
unbalance between phases must always be less than 2%.
- The control circuit power supply is taken from the power line via a transformer situated in the electrical control
panel; the control circuit is protected by fuses.
- Make sure the power line is correctly connected with a clockwise phase sequence.
In the electrical control panel, there is a phase sequence relay provided with two LEDs.
The green LED indicates the presence of the three-phase line.
The yellow LED indicates the correct phase sequence.
Fig. 8 Phase sequence relay
The contact of the phase sequence relay cuts off the 230 V power supply and therefore the controller
will in any case be powered, but the fans and compressors will not start.
To fix the power cable, use power cable fixing systems that resist tensile and torsional stresses.
The weight of the cables must not be borne by the electrical connection system.
Make sure no voltage is present before carrying out any operation on electrical parts.