30
3-2
INS
TALLER
US
ER
MAINTEN
AN
CE TECHNI
CI
AN
3.2 BOILER HYDRAULIC DIAGRAM.
Key:
1 - Condensate drain trap
2 - Water inlet filter*
3 - Domestic hot water flow meter
4 - Domestic hot water flow rate adjuster
5 - Domestic hot water probe
6 - Gas valve
7 - Gas valve outlet pressure point (P3)
8 - Boiler circulator pump
9 - Vent valve
10 - Venturi positive sign (P2)
11 - Venturi negative sign (P2)
12 - Air/gas Venturi manifold
13 - Fan
14 - Gas nozzle
15 - Detection electrode
16 - Air intake pipe
17 - Condensation module
18 - Manual vent valve
19 - Heat exchanger safety thermal fuse
20 - Air sample point
21 - ∆p gas pressure point
22 - Flue sample point
23 - Fumes hood
24 - Heat exchanger safety thermal fuse
25 - Delivery probe
26 - Safety thermostat
27 - Ignition electrodes
28 - Burner
29 - Condensation module cover
30 - Return probe
31 - System expansion vessel
32 - System draining valve
33 - System pressure switch
34 - DHW heat exchanger
35 - Three-way valve (motorised)
36 - System vent tank air valve
37 - 3 bar safety valve
38 - System vent tank
39 - System filling valve
40 - Hydraulic manifold
41 - System probe
42 - System circulator pump
* =
Attention:
check the presence and
cleanliness of the water inlet filter,
which guarantees the efficiency of the
boiler
G - Gas supply
AC - Domestic hot water outlet
AF - Domestic cold water inlet
SC - Condensate drain
RHT - Return to heat pump
MHT - Flow from heat pump
M - System flow
R - System return