15
Figure 3-1 Burner unit main components
3 - MAIN COMPONENTS
1 - Air / gas mixing device
2 - Gas valve
3 - Air intake silencer
4 - High limit temperature safety switch (UL 353 listed)
5 - Burner unit supply temperature sensor (par. 1001)
6 - Burner unit supply connection
7 - Burner unit supply pipe
8 - Gasket
9 - Unit heat exchanger
18
8
11
17
9
7
15 16
6
14
10
5
12 13
134 2
020009.01.004
10 - Burner unit return connection
11 - Support arrangement
12 - Plug (present on BURNER 2, 3 and 4 if any)
13 - Water pressure sensor (present on Burner 1 only)
14 - Spark generator
15 - Ignitors covers
16 - Water fl ow sensor (par. 1062)
17 - Motorized valve (optional)
18 - Return pipe
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