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Building Technologies Division
Basic documentation LMV36...
CC1P7544en
Infrastructure & Citiies Sector
7 Basic unit
25.09.2013
7.3.4 Air pressure switch (APS) 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.
LMV...
Bild 277e/1010
X3
-0
2
Air pressure switch (LP)
“L” for air pressure switch (LP)
2
1
Figure 19: Air pressure switch (APS) X3-02
No. Parameter
235
Air pressure switch
1 = active
2 = active, except phase 60...66 (pneumatic operation only)
335
Fuel 1: Air pressure switch
1 = active
2 = active, except phase 60...66 (pneumatic operation only)
Error
code
Diagnostic
code
Meaning for the LMV36... system
3
0
Air pressure off
1
Air pressure on
4
Air pressure on – prevention of startup
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
196
Repetition limit air pressure failure
1 = no repetition
2 = 1 repetition