7
Unit operation and space heating
NOTE
NOTE
8 TYPICAL APPLICATION EXAMPLES
The application examples given below are for illustration purposes only.
8.1 Application 1
Space heating only application with a room thermostat connected to the unit.
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: Inside circulation pump
2 y-shape filter
3 stop valve (field supply)
4 user interface
5 room thermostat (field supply)
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 circulation pump (field supply)
12 collector (field supply)
FHL 1…n floor heating loop
If the volume of balance tank(9) is larger than 30L, the buffer tank(8) is unnecessary, otherwise the buffer tank(8) should be installed and
the total volume of balance tank and buffer tank should larger than 30L. The drain valve (6) should be installed at the lowest positon of
the system. For 5/7/9kW unit, the backup heater (1.5) is not integrated in the outdoor unit. An independent backup heater can be selected
and installed in the door.
When a room thermostat is connected to the unit and when there is a heating request from the room thermostat, the unit will start operating
to achieve the target water flow temperature as set on the user interface. When the room temperature is above the thermostat set point in the
heating mode, the unit will stop operating. The circulation pump (1.8) and (11) will also stop running. The room thermostat is used as a switch
here.
Make sure to connect the thermostat wires to the correct terminals, method B should be selected (see "For room thermostat" in 9.6.6
connection for other components). To correctly configure the ROOM THERMOSTAT in the FOR SERVICEMAN mode see 10.7 Field
settings/ROOM THERMOSTAT.
4
5
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11
10
FHL1 FHL2 FHLn
12
1
32
6
7
8
9
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