15
2.12. W
ATER
C
IRCUIT
D
IAGRAMS
A
B
C
D
E
1
4
5
6
7
8
9
11
10
12
13
14
15
16
17
18
19
21
23
24
22
2
3
20
L
EGEND
:
1
-
Heating flow temperature probe
2
-
Air release valve
3
-
Pump pressure switch
4
-
Ignition/detection electrode
5
-
Injector
6
-
Fan
7
-
Silencer
8
-
Condensate discharge tube
9
-
Gas valve
10 -
Pressure gauge
11 -
Safety valve
12 -
Secondary heat exchanger
13 -
Domestic hot water temperature probe
14 -
Drain valve
15 -
Domestic hot water flow switch
16 -
Motorised valve
17 -
Automatic By-pass
18 -
Circulation pump with automatic air release valve
19 -
Condensate trap inspection cap
20 -
Condensate trap
21 -
Heating return temperature probe
22 -
Expansion vessel
23 -
Main Heat exchanger
24 -
Burner
27 MFFI