Siemens SQN72 Series Manual page 16

Circuit diagrams (examples)
No. C  LFL / LGK16 / LAL / LOK16
2-stage or modulating operation  prepurging at high-fire position (NL)
16/20
Smart Infrastructure
X1 Plug-in space, 4-pole
X2 Plug-in space, 5-pole
I red
II blue
III orange
IV
black
Program sequence diagram
shows modulating operation.
CC1N7802en
8/11/2021