Siemens SQN72 Series Manual page 15

Circuit diagrams (examples)
No. B LMO39
2-stage operation  prepurging at low-fire position (KL)
Smart Infrastructure
1) Without oil preheater
2) With oil preheater
*) Thermostat or similar unit with
NO contact (1-wire control)
X1 Plug-in space, 4-pole
X2 Plug-in space, 5-pole
Cam switches
I
red
II blue
III orange
IV black
4)
One-sided approach to the target
position to eliminate the switching
differential (backlash
compensation)
15/20
CC1N7802en
8/11/2021