Bosch 520PN Applications Manual page 98

Greentherm & thermtankless water heaters
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56 | Interior components diagram and parts list
13.2.3 Group 3
Fig. 80 Components Diagram
Item
Description
1
Main burner (Natural Gas)
1
Main burner (LP Gas)
2
Burner gasket
3
Primary fan
4
Backflow temperature sensor
5
Washer
6
Fan mount nut
7
Secondary fan
8
Screw
9
Gas / Air Mixer
Table 42
6 720 644 887 (2013/02)
Item
Reference
11
8 708 120 650 0
12
8 708 120 673 0
13
8 704 701 087 0
14
8 707 204 081 0
15
8 707 206 459 0
16
8 704 701 097 0
17
2 915 011 006 0
Table 42
8 707 204 082 0
8 703 403 012 0
8 705 700 170 0
Description
Venturi
O-ring
Mixer / Fan gasket
Screw
Plate gasket
Air supply duct
Screw
Reference
8 700 306 226 0
8 700 205 224 0
8 704 701 059 0
2 910 642 150 0
8 701 004 049 0
8 705 700 155 0
2 910 952 122 0
C 1210 ES/ESC

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