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5.1
Outdoor unit electrical connections
In accordance with the installation instructions, all systems
for disconnecting the main power supply must have an open
contact (4 mm) that guarantees full disconnection as per the
indications of the Class III overvoltage conditions.
a
Make the earth connection before proceeding
with all the other electrical connections.
a
The indoor and outdoor units must be powered
separately.
a
To avoid any risk, the power cable of the indoor
and outdoor units must be replaced only by spe-
cialised technicians.
– Remove the front panel to access the electrical parts.
– Remove the pre-cut sections (1) with the aid of a screw-
driver in order to pass the electrical cables.
a
Prior to accessing the terminals, all the supply
circuits must be disconnected
1
Fig. 56
M2
M1
Fig. 57
1-ph outdoor unit terminal board
M1
EH1 EH1 ST1 ST1 L
M2
S
G
ATG
M1
Main power supply terminal board
M2
Signal terminal board
ATG
ATG Bus connection between indoor and outdoor units
1ph
Connection to single-phase power supply
EH1
Anti-freeze electrical heating element for protecting hy-
draulic pipes
ST1
Safety thermostat (230 V) connection for the under-floor
system (bridged by default)
3-ph outdoor unit terminal board
M1
EH1 EH1 ST1 ST1 L1 L2 L3 N
M2
S
G
ATG
M1
Main power supply terminal board
M2
Signal terminal board
ATG
ATG Bus connection between indoor and outdoor units
3ph
Connection to three-phase power supply
EH1
Anti-freeze electrical heating element for protecting hy-
draulic pipes
ST1
Safety thermostat (230 V) connection for the under-floor
system (bridged by default)
Electrical connections
⏚
N
1ph
Fig. 58
⏚
3ph
Fig. 59
33 / EN
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