Application Lme39.100; Figure 13: Application Examples With Ldu11 - Siemens LME39 Series Basic Documentation


Building Technologies Division
10.4 Application LME39.100... with LDU11...

Before startup of burner

In the case of plants without vent pipe to atmosphere
BCI
K1
10
12 2
AL
H
Si
L
N
I ar2
E
LDU
GP

Figure 13: Application examples with LDU11...


Valve proving is started each time the system is switched on, with connection of
terminal 3, after controller ON or after lockout

If the LDU11... initiates lockout, valve proving can take up to 160 seconds.
Therefore, the maximum permissible response time of the air pressure switch is
180 seconds

With the LDU11..., faults during valve proving lead to lockout and, with the
LME39.100..., to lockout due to air pressure switch timeout (blink code 3)

Note!
A faulty air pressure switch (air pressure switch does not closing) leads to lockout
(blink code 3) on completion of the pressure switch response time of 180 seconds
and can be distinguished from lockout due to faulty valve proving only because the
LDU11... did not go to lockout

The fan motor must be connected to terminal 6 of the LDU11... since release takes
place via the air pressure switch upon successful valve proving
Basic Documentation LME39...
10 Inputs and outputs/internal connection diagram/program sequence of LME39.100...
3 7
4
5
HR
hr1
hr2
9 6 11
LP
BV2
SA
III V XI
DW
A1 B
Gas
Atmosphäre
LDU
GP
8
1
EK2
7106a10e/1011
LDU11...
35/73
CC1P7106en
08.12.2017