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3.6.3 - Electrical connections
Carry out the connections of the cables listed in the previous paragraph to the terminal blocks of the inter-
nal and external units referring to fig. 19, 20, 21, 22 as described below. Wiring diagram legend (Fig.22).
Ref.
Description
Input for remote control COOLING ON (use
1
free contact, close on L to activate)
Input for remote control HEATING ON (use
2
free contact, close on L to activate)
Input for remote control ECO (use free contact,
3
close on L to activate)
3W
3-way valve control output
Input for remote control NIGHT (use free
4
contact, close on L to activate)
5
Remote control common inputs (connected N)
Input from SMART GRID or photovoltaic FTV1
8
(use free contact, close on L to activate)
Input from SMART GRID or photovoltaic FTV2
9
(use free contact, close on L to activate)
External heat source activation (free contact
14 15
3A 250VAC output)
Alarm activation (free contact 3A 250VAC
16 17
output)
24 25
External air temperature sensor
Domestic water accumulation temperature
26 27
sensor
Communication port RS485 for domotic SIOS
A B
CONTROL
C1
Domestic hot water compressor condenser
CAN
Not available
Input for remote control SANITARIO (use free
ACS
contact, close on L to activate)
EH1
Electric heater 1
EH2
Electric heater 2
J3
Domestic hot water flow switch input
J10
Main flow switch input
* Add an interruption circuit compliant with the local laws
** Output K5 cannot be connected directly to the heater, add an external relay with appropriate
electrical specifications.
The function Smart Grid is not available at the moment.
EN - 24
Ref.
Description
K1
Safety device for electric heater EH1
K2
Main relay for electric heater EH1
K3
Safety device for electric heater EH2
K4
Main relay for electric heater EH2
Output (3A 250Vac) for domestic hot water
K5
accumulation electric heater relay**
P1
Main pump
P2
Domestic hot water pump
PWM
Main pump speed signal output
Q P G
External unit communication port
T1
Main exchanger inlet water temperature probe
Main exchanger outlet water temperature
T2
probe
T8
Solar thermal system water temperature probe
Thermostat remote control input (use free
TA
contact, close on L to activate)
TS1
Electric heater EH1 safety thermostat
TS2
Electric heater EH2 safety thermostat
USB1
Power board software update USB input
USB2
Display board software update USB input
X1
Terminal for field lines connections
X2
Terminal for power supply connection*
Terminal for auxiliary electric heaters power
X3
supply connection*
Terminal for Photovoltaic - Smart Grid function
X4
connection
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