21
4.5
Structure
18
19
20
21
15
16
17
14
1
33
3
4
5
6
7
11
10
12
13
9
8
2
29
30
24
26
27
28
25
32
31
23
22
1
Air inlet pipe
2
Gas boiler smoke evaporator
3
Heat exchanger bleed point
4
Heat exchanger
5
Exhaust sensor (SF)
6
Combustion chamber door
7
Air/gas duct
8
Flame viewing window
9
Ignition/detection electrode
10
Expansion vessel
11
Safety thermostat (TS)
12
Delivery sensor (SM)
13
Fan
14
Condensate siphon
15
Diverter valve
16
System filling unit
17
Domestic hot water sensor (SS)
18
Boiler control panel (gas side)
19
Domestic hot water heat exchanger
20
Gas valve
21
Automatic bleed valve
22
HP control panel
23
Return temperature probe
24
Domestic hot water filter
25
System relief valve
26
Boiler drain
27
Pump
28
Water pressure transducer
29
Plate capacitor
30
Air evaporator
31
Heat pump air outlet duct
32
Boiler smoke outlet duct
33
Boiler/heat pump air inlet duct
Fig. 33
