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Building Technologies Division
Basic Documentation LME7...
CC1P7105en
Infrastructure & Cities Sector
9 Basic unit
29.11.2011
9.2.3
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 (X3-02 terminal 1 to X2-01 terminal 3).
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.
LME...
7105z17e/1111
X3
-0
2
Air pressure switch (LP)
“L” for air pressure switch (LP)
2
1
Figure 12: Air pressure switch X3-02