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The cross-section and length of the cables must be sized ac-
cording to the power indicated on the indoor unit's data plate.
a
Once you have completed the connections be-
tween the indoor and outdoor units, put both
electrical panels back into place.
a
Always keep the power and signal cables separate.
Signal terminal board
M1
ATG BUS
OPEN
DHW HEATER ANODE TA1 TA2
THERM
GND
BUS
+24V
GND
RL
FB STH
+24V
GND
Reference
ANODE
Connection to the tank protection anode.
Observe the electrical polarities.
TA1
Contact room thermostat connection, zone
TA2
Room contact thermostat connection, zone
SE
Outdoor temperature sensor connection.
TNK
Calorifier sensor connection.
EBUS 2
BUS connection for system interface.
IN-AUX 1
Auxiliary input 1 connection (dry contact).
Select the operating mode through parame-
IN-AUX 2 STE
Connection of auxiliary input 2 (dry con-
tact). Connection of the safety thermostat
to the EM board. Select the operating mode
through parameter 1.1.4. By default it is
set to under-floor safety thermostat and is
BUF
Connection to the puffer sensor.
OPEN THERM
Connection to thermostat Open - Therm
DHW HEATER
Connection to the "Heating Element" acces-
ATGBUS
Connection between indoor and outdoor
EBUS2
IN
IN AUX
2 STE BUF
SE
TNK
AUX 1
B
T
Fig. 70
Description
1. (Bridged by default).
2.
ter 1.1.3.
bridged.
sory of the tank
unit
Power terminal board
OUT
OUT
HV
HV
AUX 2
AUX 1
IN 1
IN 2
Reference
OUT-AUX 1 /
Auxiliary output, dry contact. Select the
2 / 3 / 4
operating mode through parameters 1.2.0/
HV input 1
230 V input. Select the operating mode
through parameter 1.1.0.
HV input 2
230 V input. Select the operating mode
through parameter 1.1.1.
PM AUX
Auxiliary pump connection.
V1
Diverter valve connection for domestic water
supply distribution network.
V2
Diverter valve connection for cooling circuit.
Electrical connections
PM AUX
V1
V2
OUT
OUT
AUX 4
AUX 3
⏚
N
L
LC
N
LO
LC
N
LO
N
230V
L
Fig. 71
Description
1.2.1 / 1.2.2 / 1.3.3.
37 / EN
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