
26
- en
INSTRUCTIONS FOR FITTERS
24
Legend:
1
Water pressure switch
2
Three-way valve
3
Three-way valve motor
4
Water-water plate heat exchanger (automatic by-pass)
5
Gas valve
6
Gas train with injectors
7
Central heating NTC sensor
8
Ignition / flame detection electrode
9
Safety thermostat
10
Water-fumes exchanger
11
Fumes conveyor
12
Fumes thermostat
13
Burner
14
Expansion vessel
15
Pump and air separator
16
Boiler drain tap
17
Pressure gauge
18
Safety valve
19
Boiler filling tap
20
DHW priority sensor
21
NTC domestic hot water sensor
Figure 18
Heating
delivery
DHW
outlet
Gas
DHW
inlet
Heating
return
CG_2004 / 1001_2202