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3.9
CIRCUIT DIAGRAM
16
L N
20
19
18
17
21
Fig. 3
Electrical scheme
1
Intlet water temperature sensor
2
Outlet water temperature sensor
3
Flue gas recirculation temperature sensor
4
Cascade kit output connection
5
Cascade kit input connection
6
Ionization sensor
7
Water flow sensor
8
Flue gas overheat sensor
9
Heat exchanger overheat thermostat (104°C)
10
Gas valve
11
Flue gas temperature sensor
12
Water valve
13
Primary fan
14
ON/OFF switch
15
Secondary fan
16
Power supply cable
17
Mains power connection terminal
18
Ignition electrodes
19
Earth bonding
20
Frost protection connection
21
Fuse (2,5A)
22
Fuse (1,6A)
6 720 646 322 (2012/05)
15
13
M
M
22
12
T=90°C
M
E
PS
T=104°C
16
16
...
...
1
1
20
20
...
...
14
JP2
JP8
JP7
JP6
JP5
6720608917-02.1AL
APPLIANCE INFORMATION
11
10
9
T=110°C
8
7
FS
6
5
4
3
1
1
2
1
9
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