Air Pressure Switch X3-02 - Siemens LMV27.100x2 Basic Documentation

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7.3.5 Air pressure switch X3–02
Input for connection of an air pressure switch. Air pressure is anticipated when the fan is
switched on. If there is no air pressure signal, the system initiates lockout. The air
pressure switch must have an NO contact.
If no air pressure switch is required (e.g. when firing on oil), a wire link to the fan output
must be fitted (between X3-02, pin 1, and X3-05, pin 1).
Caution!
The OEM must check to see whether the burner can be operated without air
pressure switch. This may necessitate a special approval, depending on the
type of application.
"L" for air pressure switch (LP)
Air pressure switch (LP)
Figure 17: Air pressure switch X3-02
No. Parameter
Air pressure switch
235
1 = active
2 = active, except phase 60...66 / 70...72 (pneumatic operation only)
Error Diagnostic
code code
3 0
1
4
For the input, a repetition counter can be parameterized. Here, it is possible to set the
number of errors that are permitted until lockout occurs (refer to subsection Repetition
counter).
No. Parameter
Repetition limit air pressure failure
196
1 = no repetition
2 = 1 repetition
3 = 2 repetitions
Recharging time:
End of Shutdown phase
Basic Documentation LMV27...
7 Basic unit LMV27
LMV...
Bild 277e/1010
Meaning for the LMV27
Air pressure off
Air pressure on
Air pressure on – start prevention
2
1
CC1P7541en
17.12.2018