4.3
Main components
4.3.1
List of components
Fig.9
Hydraulic layout
21
13
20
18
19
12
14
PN-0000387
Tab.15 Component descriptions
Key
Description
Key
Description
Key
Description
1
Expansion vessel
9
Flue sensor
17
Flue adaptor
2
Expansion vessel valve
10
Spark ignition electrode
18
Heating flow sensor
3
Primary heat exchanger
11
Control box
19
Safety thermostat
4
DHW plate heat exchanger (not
on System Models)
12
Condensate trap
20
Water Pressure Switch
5
Pump with automatic air vent
13
Safety pressure relief valve
21
Condensate outlet
6
CH system pressure gauge
14
Gas valve
22
Silencer
7
Fan assembly
15
Diverter valve motor (not on
System Models)
23
Hall effect sensor (not on Sys
tem Models)
8
Burner / door assembly
16
Boiler controls
Fig.8
Component descriptions
PN-0000262
1
2
17
5
3
6
16
7
8
9
11
10
22
4 Description of the product
20