Alpha 240XP Installation And Servicing Instructions page 5

2.10 BOILER SCHEMATIC -
Heating Domestic
Flow Hot Water
Alpha 240XP
Gas Cold Mains
Water Inlet
Outlet
1
2
3
4
5
6
7
8
9
10 - DHW expansion device (if fitted)
11 - Drain point
12 - Pressure relief valve
13 - DHW flow valve microswitch
14 - Primary flow valve microswitch
15 - Pump and air separator
16 - Automatic air vent
17 - DHW temperature sensor
18 - Primary temperature sensor
19 - Overheat thermostat
20 - Expansion vessel
21 - Gas valve
22 - Main burner injector
23 - Main burner
24 - Pilot burner
25 - Thermocouple
26 - Main heat exchanger
27 - Flue hood
28 - Fan
29 - Air pressure switch
30 - Positive pressure point
31 - Negative pressure point
32 - Flue adaptor
33 - Flue sample point
34 - Room sealed chamber
35 - On/off valve
36 - On/off valve and filter
Heating
Return
Fig. 2
Alpha 240XP and 240XE - Technical Data
- Pressure gauge
- Gas service cock
- Mains inlet on/off valve and filter
- Diverter valve assy.
- DHW flow valve
- Primary flow valve
- Differential pressure sensor
- Automatic by-pass
- DHW heat exchanger
5