13
4000121771-2
5 Boiler Schematic
1 - Fan.
2 - Air pressure switch.
3 - Heat exchanger.
4 - Overheat thermostat.
5 - Combustion chamber.
6 - Expansion vessel.
7 - Flame sense electrode.
8 - Burner.
9 - Ignition electrode.
10 - Pump.
11 - Heating thermistor.
12 - Ignition unit.
13 - By-pass.
14 - Gas valve.
Diagram 5.1
11422
A -
Heating return
B -
Cold water inlet
C -
Heating flow
D -
Domestic hot water outlet
E -
Gas
15 - Loss of water sensor.
16 - Domestic heat exchanger
17 - 3 way valve
18 - Domestic water flow sensor
19 - Filter cold water inlet
20 - Filling system
21 - Discharge safety valve (3bar)
22 - Drain valve
23 - Heating filter
24 - Domestic safety valve 10 bar
25 - Micro accumulation vessel thermistor
26 - Micro accumulation vessel
27 - Heating element
6
9
7
8
4
5
3
11
12
27
26
25
14
13
10
17
20
19
18
16
15
23
22
21
24
1
2
FITTED TO
REAR OF
APPLIANCE
FITTED TO
REAR OF
APPLIANCE
