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■Pump operation and space heating and cooling
According to the season, the unit will switch to either heating or cooling mode according to the temperature detected by the room thermostat.
When space heating/cooling is requested by the room thermostat (5), the pump will start operating and the unit (1) will switch to heating mode/cooling
mode. The unit (1) will operating to achieve the target cold/hot water leaving temperature.
In the cooling mode. the motorized 2-way valve (20) will close to prevent cold water running through the floor heating loops (FHL).
■ Make sure to connect the thermostat wires are routed to the correct terminals and to configure the ROOM THERMOSTAT in the user interface
correctly (see 10.7 Field settings/ROOM THERMOSTAT). Wiring of the room thermostat should follow method A as described in 9.6.6
connection for other components/For room thermostat.
■ Wiring of the 2-way valve (20) is different for a NC (normal closed) valve and a NO (normal open) valve! Make sure to connect to the
correct terminal numbers as detailed on the wiring diagram.
The ON/OFF setting of the heating/cooling operation cannot be done on the user interface.
■ Domestic water heating
Domestic water heating is as described in 8.2 Application 2.
8.4 Application 4
Space cooling and heating application without a room thermostat connected to the unit , but with heating/cooling thermostat controlling the fan
coil units. Heating is provided through floor heating loops and fan coil units. Cooling is provided through the fan coil units only.
1
1.6 1.7
1.8
1.5
1.3
1.2
1.4
1 outdoor unit
1.1 manometer
1.2 pressure relief valve
1.3 expansion vessel
1.4 plate heat exchanger
1.5 backup heater
1.6 air purge valve
1.7 flow switch
1.8 P_i: circulation pump in the unit
2
y-shape filter
3
1.1
2
3
8
7
6
3
stop valve (field supply)
4
user interface
6
drain valve (field supply)
7
fill valve (field supply)
8
buffer tank (field supply)
9
balance tank (field supply)
9.1 air purge valve
9.2 drain valve
10
expansion vessel (field supply)
11
P_o: outside circulate pump (field supply)
CAUTION
4
10
9.1
20
11
M
9
9.2
12
collector (field supply)
18
bypass valve (field supply)
20
SV2: 2-way valve (field supply)
FHL 1...n floor heating loop
FCU 1...n fan coil units
M1...n
T1...n
10
T1
T2
Tn
12
Mn
M2
M1
FCU1
FCU2
12
FHL1
FHL2
motorized valve (field supply)
room thermostat (field supply)
18
FCUn
FHLn
V.2
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