Giatsu WD2N8B Serie Manuel De L'utilisateur Et D'installation page 88

9.3 Water piping
All piping lengths and distances have been taken into consideration.
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
Code Assembly unit
1 Main unit
2 User interface(accessory)
4 Buffer tank
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
Indoor
4.1
4
14 4.2
15
14
16 16
(Field supply)
The maximum allowed thermistor cable length is
5
FHL1
Code Assembly unit
12 Filter (Accessory)
14 Shut-off valve (Field supply)
15 Filling valve (Field supply)
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