Commissioning; Preliminary Operations - Daikin UATYA-BBAY1 Montage- Und Betriebsanleitung

6

COMMISSIONING

6.1 Preliminary operations

The unit should only be started up by qualified personnel authorised by the manufacturer.
All the units are pre-charged with refrigerant gas, so the refrigerant circuit is pressurised.
The unit is filled with refrigerant gas, classified as A2L (mildly flammable).
Check:
- that the electrical connection has been made correctly and that all terminals are properly tightened;
- that the voltage on the RST terminals is 400 V ± 10% (or the rated voltage of the unit if there are special voltages).
- that the gas pressure in the refrigerant circuits is shown on the pressure gauges (if present) or on the control
display;
- that there are no refrigerant fluid leaks, using a leak detector if necessary (the presence of oil stains may be a
sign of refrigerant leaks).
Be careful with the electrical checks and use only suitable tools.
Position the master switch of the unit to ON and check on the display of the control that the unit is OFF in order to
prevent it from starting.
Check that the heaters for heating the oil in the compressor crankcases are powered correctly.
The crankcase heaters are switched on when the main disconnect switch is closed and this must be
done at least 12 hours before starting the unit.
To check that the heaters are working correctly, check that the lower part of the compressors is hot and in any case
at a temperature of 10 - 15 °C above ambient temperature.
Check:
- that any sensors supplied with the unit are installed correctly according to the wiring diagram and the relevant
documentation;
- that the remote control, if any, is connected as shown in the wiring diagram and that it is working correctly;
- that the connection to the aeraulic system has been made correctly, via the air supply and return channels;
- that the hydraulic connections have been made following the instructions on the inlet/outlet plates and that a
mechanical filter has been installed at the inlet of the unit (failure to install this mandatory component will void
the warranty);
- that the hydraulic system has been bled, to remove any remaining air, by filling it gradually and opening the bleed
devices including the one on top of the coil;
- that a suitable syphon has been made on the condensate drain.
If the unit has a gas burner, follow the relevant instructions attached to the unit.
Before starting the unit, check that all the closing panels of the unit are in place and secured with
fixing screws.
Translation from original instructions
Packaged Rooftop
44
We reserve the right to make changes without any prior notice.
4P645202-1
UATYA