27
MAIN COMPONENTS
LEGEND
1
Hot water expansion tank
2
Water-heater sensor
3
Heating expansion tank
4
Flue control
5
Delivery sensor
6
Burner
7
Circulator
8
Electric 3-way valve
9
Automatic by-pass
10
Safety flow-switch
11
Modulating coil
12
Gas valve
13
Hot water circuit:
- 8-bar safety valve
- Non-return valve
- Inspection filter
14
Total safety thermostat
15
Fume exchanger
16
Stainless steel water-heater
17
Thermohydrometer
18
Malfunction warning light
19
ON/OFF warning light
20
Lock-out warning light
21
Hot water adjustment potentiometer
22
Function selector
23
Heating adjustment potentiometer
1
2
3
5
PE
TS
1
PE
TS
1
10
9
11
12
13
7
8
4
6
14
15
16
17
23
22
21
18
19
20