Commissioning; Preliminary Operations - Daikin UATYQ-AFC3Y1 Installation, Use And Maintenance Instruction

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.
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 powered 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 the external 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 a suitable syphon has been made on the condensate drain.
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
Installation manual
30
We reserve the right to make changes without any prior notice.
UATYQ*Y1
Packaged Rooftop
4P522680-1