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8.2 Application 2
ROOM THERMOSTAT control for space heating or cooling need to be set on the user interface. It can be set
in three ways: MODE SET/ONE ZONE/DOUBLE ZONE. The unit can be connected to a low voltage room
thermostat.
8.2.1 One zone control
Outdoor
1
Modbus
Cod e
1
Main unit
2
User interf ace
Buffer tank (Field supply)
4
Automatic air purge valve
4.1
Drainage valve
4. 2
P_o: Outside circulation pump (Field supply)
5
10
Expansion vessel (Field supply)
Space heating
One zone control: the unit ON/OFF is controlled by the room thermostat, operation mode and
outlet water temperature are set on the user interface. System is ON when "H,L" of the thermostat
keep closing for 15s. When "H,L" keep opening for 15s, system turns OFF.
The circulation pump operation
When the system is ON, which means "H,L" of the thermostat close, P_o starts running; When the
system is OFF, which means "H,L" open, P_o stops running.
2
RT
14
15
16
12 1416
Assembly unit
12
Indoor
10
4.1
5
4
4.2
FHL1
Assembly unit
Cod e
Filter (Accessory )
12
Shut-off valve (Fiel d supply)
14
Filling valve (Fi eld sup ply)
15
Drainage valve (Fiel d sup ply)
16
Collector/distributor (Field supply )
19
R T
Low voltage room thermostat (Field supply)
FHL 1...n Floor heating loop (Field supply)
19
FHL2
FHLn
V.1
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