8
3.7 BOILER SCHEMATIC
Fig. 3.2
Alpha E-Tec 25R - Technical Data
1
Gas isolation valve
2
Gas valve
3
Gas injector
4
Condensate trap
5
Venturi positive pressure point (+)
6
Primary flow sensor
7
Drain valve
8
Overheat thermostat
9
Ignition/sensing electrode
10 Air supply pipe
11 Flue temperature sensor and thermal fuse
12 Flue test point (pressure point +)
13 Air test point (pressure point -)
14 Condensing heat exchanger
15 Burner
16 Primary return sensor
17 Venturi
18 Fan
19 Drain valve
Gas
Condensate discharge
Primary
Heating
return
Primary
Heating
flow
1
2
3
4
5
6
7
8
9
10
11
12
17
19
16
18
15
14
13
