Alpha InTec2 20SE - Page 8

8
2.7 BOILER SCHEMATIC
1 - Gas valve
2 - Expansion vessel
3 - Primary heat exchanger
4 - Air/gas mixer
5 - Fan
6 - Ignition/detection electrode
7 - Air test point (pressure point -)
Fig. 2.4
8 - Flue test point (pressure point +)
9 - Flue temperature sensor
10 - Manual air vent
11 - Primary temperature sensor
12 - Overheat thermostat
13 - Return thermostat
14 - Automatic air vent
15 - Pump
16 - Primary pressure switch
17 - Automatic bypass
18 - Drain point
19 - Condensate trap
20 - Safety valve
21 - Safety valve indicator
Alpha InTec² 20SE and 30SE - Technical Data
Gas
Condensate discharge
and expansion relief
Primary
Heating
return
Primary
Heating flow
9
10
11
12
14
15
16
17
18
19
20
21
8
7
6
5
4
3
2
1
F(+) A(-)
13
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