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5.4.4 Application 4
Space cooling and heating application with a standard controller (or optional wired controller) connected to the unit. Heating is provided
through floor heating loops. Cooling is provided through the fan coil units only. The 3-way valve is used to change the direction of water flow
when the operation mode changed.
4
T1
T2
12
Tn
15
1
M1
M2
Mn
10
FCU1
FCU2
FCUn
5
9.1
11
16
12
M
9
2
3
9.2
13
6
7
8
FHL1
FHL2
FHLn
1
outdoor unit
10
expansion vessel (field supply)
2
Y-shape filter
11
Pump 2: outside circulation pump (field supply)
3
shut-off valve (field supply)
12
collector (field supply)
4
wired controller (optional)
13
mixing station (field supply)
5
non-return valve (field supply)
15
by-pass valve (field supply)
6
drain valve (field supply)
16
Motorised 3-way valve (field supply, field control)
7
fill valve (field supply)
FHL 1...n
floor heating loop
8
buffer tank (field supply)
FCU 1...n
fan coil units
9 balance tank (field supply)
9.1 air purge valve
9.2 drain valve
NOTE
If the volume of balance tank (9) larger than 30L, the buffer tank(8) is unnecessary, otherwise the buffer tank(8)
B
should be installed and the total volume of buffer tank and balance tank should larger than 30L.The drain valve (6)
should be installed at the lowest position of the system. An independent backup heater can be selected and installed
in the door, which can provide additional heating source and ensure better performance of the system when the
inlet
M
ambient temperature is low.
The 3-way valve control requires field control, the unit does not provide control function.
In normal condition, port A should be opened, while signal sent to the 3-way valve (16), port A will be closed and port B will be opened.
When in cool mode, ON signal will sent to the 3-way valve (16), the cold water will flow through port inlet to port B, and port B should
connect to the fan coil units. While in heating mode, the hot water will flow through port inlet to port A, and port A should connect to the
floor heating loops. In this way, all the water from the unit will flow through the floor heating loops and thus ensure better performance of
the floor heating.
A
17
18


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