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4.2
Schematic hydraulic diagram
1 ZONE FS
1
A
Symbol
Communication connection
Electrical connection
Domestic cold water inlet
Domestic hot water outlet
A
Tray heating element (accessory)
B
Anti-freeze kit (accessory)
C
Zone with high temperature space heating/low tem-
perature cooling (fan coil)
D
Low-temperature heating/cooling zone with un-
der-floor system
NOTE: installations with under-floor system
In installations with under-floor heating, make sure that in all
operating modes (the hot water switching mode in particular),
the input temperature of the floor falls within the limits allowed
for the application as specified in the national regulations.
For installations with under-floor system, install a safety device
on the heating delivery circuit, as specified in the national reg-
ulations.
For the electrical connection of the thermostat, refer to the par-
agraph "Electrical connections".
If the delivery temperature is too high, the system stops in
both domestic hot water and heating/cooling modes, and the
remote control will report error code 936 "Under-floor safety
thermostat open". The system will start again when the manu-
al-reset thermostat is closed.
The input to be used as a connection to the under-floor safety
thermostat is IN AUX 2 STE by default (function set through
parameter 1.1.4).
8
4
4
B
Description
System flow
System return
2
9
6
4
5
4
4 4
14
1
Outdoor unit
2
Indoor unit
3
Sensys interface
4
Shutter valve
5
Sludge filter
6
System expansion vessel
7
Bypass (optional)
8
Outdoor Sensor
9
3-way valve
10 Siphon
11 Non-return valve
12 Safety valve
13 Discharge outlet
14 DHW expansion vessel
If the safety thermostat is connected to STE and the safety de-
vice intervenes, the circulation pump will continue to be fed
and the anti-freeze protection is always guaranteed.
If the safety thermostat is connected to STT and the safety de-
vice intervenes, the circulation pump will no longer be fed and
the anti-freeze protection is not guaranteed.
a
It is forbidden to disconnect the power supply to
the unit if the outdoor temperature can fall be-
low ZERO (risk of frost). Drain the central heating
and domestic hot water systems to prevent the
risk of ice forming.
a
Do not remove the heating delivery temperature
sensor (inside the heating elements).
i
Carry out the electrical connections after having
completed all the hydraulic connections.
Hydraulic connections
3
C
7
D
12
13
4
11
10
4
29 / EN
Fig. 54
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