6 720 611 137 GB (03.02)
Details of the appliance
7
1.7
Function
Fig. 3
4
Bosch Heatronic control
4.4
Y-S-module
6
Temperature limiter, heat exchanger
7
Testing point for gas supply pressure
9
Flue gas temperature limiter
13
Manifold
15
Safety valve
27
Automatic air vent
29
Mixer unit
29.1
Bi-metallic thermostat for combustion air compensation
30
Burner
32
Flame sensing electrode
33
Igniter electrode
35
Heat exchanger with cooled combustion chamber
36
Temperature sensor in boiler flow
43
Boiler flow
45
Gas inlet
47
Return
52
Solenoid valve 1
52.1
Solenoid valve 2
55
Filter
56
Gas valve CE 427
57
Main valve disc
61
Reset button
63
Adjustable gas flow restrictor
64
Adjusting screw for min. gas inlet flow volume
69
Control valve
84
Motor (optional extra)
88
3-way valve (optional extra)
221
Flue duct
226
Fan
229
Inner casing
234
Testing point for flue gas
234.1
Testing point for combustion air
317
Display
358
Condensate trap
361
Drain valve
423
Siphon
443
Diaphragm
ϑ
6 720 611 137-02.1O
33
29
30
226
229
234
234.1
6
36
29.1
63
15
45
47
43
13
69
64
57
52.1
56
55
7
358
max
1
2
3
4
5
E
ECO
0
317
61
4
32
9
35
221
27
4.4
52
361
4
443
