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
1
3
4
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
Summary of Contents for Boiler
Page 3: ...3 SAFETY INSTRUCTIONS ...
Page 5: ...5 SAFETY INSTRUCTIONS ...
Page 122: ...122 15 MAINTENANCE ...
Page 126: ...126 17 SPARE PARTS Spare parts ...
Page 129: ...129 17 SPARE PARTS 50 48 50 49 53 56 57 55 54 58 47 52 48 52 51 55 52 020010 03 006 199 ...
Page 152: ...20 SEQUENCE OF OPERATION for BOILER ...