6 720 611 400 GB (03.11)
Details of the appliance
7
1.7 Function
Fig. 3
4 Bosch Heatronic control
6 Temperature limiter, heat exchanger
6.1 Hot water NTC sensor
7 Testing point for gas supply pressure
8.1 Pressure gauge
9 Flue gas temperature limiter
13 Manifold
15 Safety valve
18 Central heating pump
20 Expansion vessel
26 Charging valve
27 Automatic 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 CH flow
43 CH flow
44 Hot water flow
45 Gas
46 Cold water inlet
47 CH 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 Gas flow restrictor, adjustable for max. gas flow volume
64 Adjusting screw for min. gas flow volume
69 Control valve
84 Motor
88 3-way valve
90 Venturi
91 Pressure relief valve
93 Water flow regulator
94 Diaphragm
95 Pushrod with switch cam
96 Microswitch
97 Valve for hot water flow volume
98 Water valve
221 Flue duct
226 Fan
229 Air box
317 Display
355 Plate-type heat exchanger
358 Condensate trap
400 Text display
423 Siphon
443 Diaphragm
6 720 610 597-
03.2O
42
3
J
33
29
30
226
229
26
6
36
29.1
63
15
45 47
20
43
44
46
13
8.1
84
90
97
98
93
94
95
96
91
69
64
57
52.1
56
52
55
7
355
M
358
18
88
max
max
1
2
3
4
5
E
ECO
0
317
61
4
400
32
9
35
221
J
27
6.1
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