Nimbus Compact M NET R32 Installation Manual UK
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Electrical connections<br />
5.1 Outdoor unit electrical connections<br />
In accordance with the installation instructions, all systems<br />
for disconnecting the main power supply must have an open<br />
contact (4 mm) that guarantees full disconnection as per the<br />
indications of the Class III overvoltage conditions.<br />
a<br />
a<br />
a<br />
Make the earth connection before proceeding<br />
with all the other electrical connections.<br />
The indoor and outdoor units must be powered<br />
separately.<br />
To avoid any risk, the power cable of the indoor<br />
and outdoor units must be installed and replaced<br />
only by specialised technicians.<br />
– Remove the front panel to access the electrical parts.<br />
– Remove the pre-cut sections (1) with the aid of a screwdriver<br />
in order to pass the electrical cables.<br />
1-ph outdoor unit terminal board<br />
M1<br />
EH1 EH1 ST1 ST1 L N ⏚<br />
M2<br />
1ph<br />
G S<br />
ATG<br />
Fig. 53<br />
1<br />
M1 Main power supply terminal board<br />
M2 Signal terminal board<br />
ATG ATG Bus connection between indoor and outdoor units<br />
1ph Connection to single-phase power supply<br />
EH1 Anti-freeze electrical heating element for protecting<br />
hydraulic pipes<br />
ST1 Safety thermostat (230 V) connection for the under-floor<br />
system (bridged by default)<br />
3-ph outdoor unit terminal board<br />
a<br />
Fig. 51<br />
Prior to accessing the terminals, all the supply<br />
circuits must be disconnected.<br />
M1<br />
EH1 EH1 ST1 ST1 L1 L2 L3 N<br />
⏚<br />
M2<br />
M2<br />
M1<br />
3ph<br />
G<br />
S<br />
ATG<br />
Fig. 54<br />
Fig. 52<br />
M1 Main power supply terminal board<br />
M2 Signal terminal board<br />
ATG ATG Bus connection between indoor and outdoor units<br />
3ph Connection to three-phase power supply<br />
EH1 Anti-freeze electrical heating element for protecting<br />
hydraulic pipes<br />
ST1 Safety thermostat (230 V) connection for the under-floor<br />
system (bridged by default)<br />
EN / 35