51
Phase
Safety chain (option)
Alarm (option)
Control thermostat
Aux. valve / servomotor
Safety valve 1
Safety valve 2
Fan relay PWM (fan)
Flame signal
Air pressure limiter Gas pressure limiter min.
Ignition
Parameters Leak detection
Gas pressure limiter leak detection
Input
Output
Input
Output
Output
Input
Input
Input
Input
Input
Output
Output
Output
Output
10
11
12
13
14
16
17
18
19
20
21
23
24
25
32
33
34
1
35
36
0
1
3
4
6
7
8
9
Output
Input
Output same or steady
Input same or steady
Burner control unit flow diagram
Burner control unit flow diagram
5692 908 GB