Table of Contents
Advertisement
6.2
Starting up instructions
Electric connections and starting up
•
Open electrical panel.
•
Disconnect the main switch.
•
Inlet cables holes are positioned on the bottom side of the unit
•
Connect the power supply and the earth connection to the main switch and to the main earth connection.
•
3 phase versions only. In case of wrong phase sequence, the compressor will start in the opposite
direction: scroll compressors have to turn in one only direction. The phase sequence relay is connected in
series with the air flow switch, so that if wrong R-S-T occurs an "FL" alarm on mP will appear. In this case
disconnect the power supply, reverse two phases before the main switch and restart. NB: the R-S-T phase
sequence device is positioned in the left part of the E-Panel: green light means power presence and the
yellow light means correct phase sequence; if the yellow light doesn't shine, switch of the main switch and
reverse two cables before the main switch.
•
Close the panel.
•
Press button "ON" on the microprocessor keyboard.
Start up
•
Make sure that the air flows normally and the flow switch alarm is not present.
•
Press the "ON" button on the mP keyboard:
The indoor fan will start immediately
o
After 20 second and if no alarm are present, the compressor will start up. NB: the compressor will
o
start if the indoor conditions are according the set point presetted in the mP.
•
Check the air Delta T: it has to be between 7 and 10 °C.
•
Check for refrigerant leakage.
Starting operation
6.3
Before starting the unit, turn the main switch on, select the operating mode desired from the control panel
and press the "ON" button on the control panel.
If the unit fails to start up, check if the service thermostat has been set according to the nominal
values provided.
You should not disconnect the unit from the power supply during periods when it is
inoperative but only when it is to be taken out of service for a prolonged period (e.g. at the
end of the season). To turn off the unit temporarily follow the directions provided in the
section 4.5.
Checks during operation
• Check the phase sequence relay on the control board to verify whether the phases occur in the correct
sequence: if they do not, disconnect the unit from power supply and invert two phases of the incoming
three-pole cable.
Never attempt to modify internal electrical connections: any undue modifications will immediately
invalidate the warranty.
@DNOVA THN_R410A-IOM-1506-E
- 15 -
Advertisement
Table of Contents
