Alpha C23 - Page 5

5
2.10 BOILER SCHEMATIC
Alpha C23/27 - Technical Data
1 - Flow regulator
2 - DHW flow switch
4 - Gas valve
5 - Primary temperature sensor
7 - Main burner
8 - Bi-thermal heat exchanger
9 - Room sealed chamber
10 - Fan
11 - Air pressure switch
12 - Flue hood
13 - Overheat thermostat
14 - Expansion vessel
15 - Automatic air vent
Fig. 2
16 - Pump
17 - Drain point
18 - Pressure relief valve
19 - Primary pressure switch
20 - Ignition electrode (front)
21 - Flame sensing electrode (rear)
22 - DHW temperature sensor
23 - Flue sampling point
24 - Gas service cock
25 - Mains inlet on/off valve
26 - On/off valve (2 off)
27 - Automatic by-pass