Boiler Schematic - Saunier Duval THEMA C 23 Installation And Servicing Instructions

BOILER SCHEMATIC

- On button
1
2 - Off button
3 - Piezo igniter
- Central heating thermostat
4
5 - Domestic hot water temperature adjuster
6 - Temperature/pressure gauge
- Non-return valve
7
8 - Expansion vessel
- Pump
9
- Automatic air vent
10
11 - Burner
- Heat exchanger bleed pipe
12
- Heat exchanger
13
14 - Gas valve
23
13
12
11
10
9
8
7
6
21
Diagram 4
A B C
- Overheat thermostat
16
17 - Ignition electrode
18 - Pilot
- High limit thermostat
19
21 - Loss of water switch
22 - Flue safety device
A - Heating return
- Cold water inlet
B
C - Heating flow
D - Domestic hot water flow
- Gas supply
E
D E
22
19
18
17
16
14
3
2
1
15
5
4
5