49
INS
TALLER
U
SER
M
AINTEN
AN
CE
TECHNI
CI
AN
TECHNI
CAL
D
AT
A
1.32 MAIN COMPONENTS
37
Key (Fig. 37):
1
- System filling cock
2
- 3-way valve (motorised)
3
- D.H.W. heat exchanger
4
- D.H.W. probe
5
- Gas valve
6
- Condensate drain trap
7
- D.H.W. flow switch
8
- Manual air vent valve
9
- Flow probe
10
- Air / gas mixer
11
- System expansion vessel
12 - Burner
13
- Sample points (air A) - (flue gases F)
14
- Flue probe
15
- Air intake pipe
16
- Ignition/detection electrode
17
- Condensation module
18 - Fan
19
- System pressure switch
20
- Return probe
21
- Boiler circulating pump
22
- 3 bar safety valve
23 - By-pass
24
- System draining cock
