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Building Technologies Basic Documentation LME7... CC1P7105en
10 Basic unit 17.04.2018
10.2.3 Air pressure switch terminal 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 (terminal X3-02 pin 1 to terminal X2-01 pin 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.
Air pressure switch (LP)
“L” for air pressure switch (LP)
Figure 14: Air pressure switch terminal X3-02
10.2.4 Input gas pressure switch-min
If gas pressure switch-min fails, safety shutdown is triggered and startup prevented
until gas pressure switch-min closes again. During start prevention, the yellow LED is lit
and the safety circuit is active. Burner control operates in phase 90
Behavior in the event gas
pressure switch-min fails
(terminal X5-01 pin 2 and pin
3)
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