Giatsu WD2N8B Serie Manuel De L'utilisateur Et D'installation page 76

8 TYPICAL APPLICATIONS
The application examples given below are for illustration only.
8.1 Application 1
2
Outdoor
1
Modbus
14
8
7
10
Code Assembly unit
1 Main unit
2 User interface
3 Buffer tank(Field supply)
3.1 Automatic air purge valve
3.2 Drainge valve
3.3 Tbt: Buffer tank upper temperature sensor(optional)
4 P_o: Outside circulation pump (Field supply)
5 T1: Total water flow termperature sensor(Optional)
6 Expansion vessel(Field supply)
Space heating
The ON/OFF signal and operation mode and temperature setting are set on the user interface. P_o keeps
running as long as the unit is ON for space heating.
AHS (auxiliary heat source) control
The AHS function is set on the user interface.(AHS function can be set valid or invalid in "OTHER HEATING
SOURCE" of "FOR SERVICEMAN".)
1) When the AHS is set to be valid only for heating mode, AHS can be turned on in the following ways:
a. Turn on the AHS via BACKHEATER function on the user interface;
b. AHS will be turned on automatically if initial water temperature is too low or target water temperature is too
high at low ambient temperature.
P_o keeps running as long as the AHS is ON.
2) When the AHS is set valid, M1M2 can be set to be valid on the user interface. In heating mode, AHS will
be turned on if MIM2 dry contact closes.
The highest outlet water temperature may reach 70°C, please beware of burn.
Indoor
AHS
6
3.1
13
5
4
3.3
3
3.2
9
10
CAUTION
11
11
FHL1 FHL2
Code Assembly unit
7 Filter(Accessory)
8 Shut-off valve(Field supply)
9 Filling valve(Field supply)
10 Drainge valve(Field supply)
11 Collector/distributor(Field supply)
12 Bypass valve (Field supply)
FHL 1..n Floor heating loop(Field supply)
AHS Auxiliary heat source(Field supply)
12
FHLn