2.0 General Layout
5
2.1
Layout
1.
Central Heating Flow
2.
Pressure Relief Valve
3.
Central Heating Return
4.
Domestic Hot Water Flow
5.
Mains Water Inlet
6.
Gas Inlet
7.
Domestic Hot Water Storage Cylinder
8.
Storage Cylinder Heating Coil
9.
Expansion Vessel
10.
Domestic Hot Water Storage Drain
11.
Heating Coil Drain
12.
Circulation Pump
13.
Gas Valve
14.
Burner
15.
Heat Exchanger
16.
Fan/Hood assembly
17.
Air Pressure Switch
18.
Electrical Cover Panel
19.
Temperature Gauge
20.
Position For Optional Integral Timer
21.
Facia Cover Panel
22.
Facia
23.
Overheat Thermostat
24.
Flow Temperature Sensor
25.
Electrical Control Box
26.
Temperature Gauge Sensor
27.
Filling Loop Connections
28.
Diverter Valve
29.
Storage Cylinder Temperature Sensor
30.
Indicator Neons
31.
Domestic Hot Water Temperature Control
32.
ON/OFF Selector Switch
33.
Central Heating Temperature Control
34.
Flame Failure Reset Button
35.
Reset Button
2.2
Optional Extras
1. Various flue extensions, bends, vertical flue
kits, control accessories etc. are available as
optional extras. These are detailed in a separate
publication.
Fig. 3
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
33
32
31
34
35
30
1
2
3
4
Unvented Kit - Principal
Components
1. Pressure Reducing Valve
2. Expansion Relief Valve
3. Tundish
4. DHW Expansion Vessel
