6
6
1
9
2
3
4
5
6
7
8
1
9
2
3
4
5
6
7
8
υ
0
0
60
90
120
4
3
2
1
30
1
2
3
4
5
7
6
8
9
10
11
12
13
14
15
33
32
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
GW 573/2GB
fig. 3
2.4 Function diagram
1 Air duct
2 Air pressure switch
3 Combustion chamber
4 Temperature sensor (NTC)
5 Ignition electrodes
6 Modulating burner
7 Overheat thermostat
8 Fully modulating automatic gas
valve
9 DHW heat exchanger
10 Indicator lights (LED’s)
11 Maximum radiator temperature
control
12 Maximum hot water temperature
control
13 Central heating control and
lockout reset
14 Main on/off control
15 CH flow service valve
16 Gas service valve
17 Flue gas duct
18 Fan
19 High efficiency heat exchanger
20 Flame sensing electrode
21 Differential pressure switch
22 Expansion vessel charging valve
23 Expansion vessel
24 Automatic air vent
25 Circulating pump
26 Diverter valve
27 Water switch (DHW)
28 Water section
29 Temperature and Pressure gauge
30 Automatic bypass valve
31 Pressure relief valve
32 CH return service valve
33 Cold water shut off valve
