Alpha CD13R Installation And Servicing Instructions page 5

2.10 BOILER SCHEMATIC
4
1
2
3
4
5
6
7
8
9
10
11
Primary Primary
Heating Heating
return
12
2
8
9
7
6
10
20
Gas Condensate
discharge
- Flue sampling point
- Flue thermostat
- Injector
- Gas valve
- Primary return temperature sensor
- Venturi
- Main burner
- Primary/condensing heat exchanger
- Room sealed chamber
- Fan
- Pressure differential test points
flow
5
1 15
-
+
-
+
21
12 - Flue hood
13 - Overheat thermostat
14 - Primary flow temperature sensor
15 - Drain point
16 - Ignition electrodes
17 - Flame sensing electrode
18 - Venturi negative point
19 - Venturi positive point
20 - Gas service cock
21 - Condensate trap
Fig. 2
Alpha CD13R, 18R, 24R - Technical Data
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13
14
16
17
18
3
19
5