Technical data

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