44
35
44
INS
TALLER
US
ER
MAINTEN
AN
CE TECHNI
CI
AN
G - Gas supply
AC - Domestic hot water outlet
AF - Domestic hot water inlet
SC - Condensate drain
M - System flow
R - System return
23 - 3-way valve (motorised)
24 - Domestic hot water expansion vessel
25 - D.H.W. probe
26 - Stainless steel coil for storage tank
27 - 8 bar safety valve
28 - Cold water inlet non-return valve
29 - Storage tank draining valve
30 - System filling cock
31 - Bypass
12 - Flue sample point
13 - Air sample point
14 - Burner
15 - Air / gas manifold
16 - Flow probes
17 - Air intake pipe
18 - Air vent valve
19 - Boiler pump
20 - System pressure switch
21 - Stainless steel storage tank
22 - Magnesium anode
Key:
1 - Gas valve
2 - Condensate drain trap
3 - 3 bar safety valve
4 - System draining cock
5 - System expansion vessel
6 - Air / gas mixer
7 - Fan
8 - Return probe
9 - Ignition/detection electrode
10 - Flue probe
11 - Flue hood
3.4 HYDRAULIC DIAGRAM.