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4.2.3 Hydraulic
diagram
LEGEND
1.
Primary exchanger
15.
Heating system return filter
2.
Safety thermostat (overheating) 105°C
16.
Pressure gauge
3.
Primary exchanger flow sensor
17.
Output flow regulator (optional)
4.
Burner
18.
3-way diverter valve
5.
Ignition electrodes
19.
Modulating circulation pump with deaerator
6.
Gas valve
20.
Flame detection electrode
7.
Secondary exchanger
21.
Expansion vessel
8.
Domestic hot water flow sensor
22.
Primary exchanger inlet sensor
9.
Bypass
10.
3-bar safety valve
A
Heating system output flow
11.
Boiler drain valve
B
Domestic hot water flow
12.
Domestic hot water inlet filter
C
Gas
inlet
13.
Filling tap (no French market)
D
Domestic cold water inlet
14.
Hot water flow meter
E
Central heating return
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