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9.3 Water piping
All piping lengths and distances have been taken into consideration.
length is 20m.
If there is no glycol (anti-freeze) in the system or there is a power supply failure or pump failure, drain the system
(as shown in the figure below).
If water is not removed from the system in freezing weather when unit is not used, the frozen water
may damage the water circle parts.
9.3.1 Check the water circuit
The unit is equipped with a water inlet and water outlet for connection to a water circuit. This circuit must be
provided by a licensed technician and must comply with local laws and regulations.
The unit is only to be used in a closed water system. Application in an open water circuit can lead to excessive
corrosion of the water piping.
Example：
Outdoor
1
Modbus
12 14 16
Code
Assembly unit
1
Main unit
User interf ace(accessory)
2
4
Buffer tank (Field supply)
4.1
Automatic air purge valve
4.2
Drainage valve
P_o: Outside circulation pump (Field supply)
5
10
Expansion vessel(field supply)
NOTE
2
10
4.1
4
14
4.2
15
16
The maximum allowed thermistor cable
Indoor
5
FHL1
Code
Assembly unit
12
Filter (Accessory)
14
Shut-off valve (Field supply)
Filling valve (Field supply)
15
16
Drainage valve (Field supply)
19
Collector/distributor (Field supply)
20
Bypass valve (field supply)
FHL
Floor heating loop (Field supply)
1...n
23
19
20
FHL2
FHLn
V.1
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