11/21
Building Technologies Division
CC1N7696en
20.04.2016
Sequence diagram
A
B
C
I
III
IV
V
VI
VII
VIII
IX
XI
XIII
AR
Test1
Test2
7
8
5
6
9
9
10
11
15
11
12
t20
t4
t1
t6
t3
t2
t5
7696b01e/0601
a
b
a
b
a
b
a
b
a
b
a
b
a
b
Output terminals
controlled by the
control unit or
electrically
connected
Program indication
Legend
t1 22.1 s
First test phase with atmospheric pressure
t2 27 s
Second test phase with gas pressure
For LDU11.323...
t3 2.5
s
Filling the test space
t4 2.5
s
Evacuating the test space
For LDU11.523...
t3 5
s
Filling the test space
t4 5
s
Evacuating the test space
t5 66.3 s
Total duration of valve proving test until burner is released
t6 7.4 s
Interval from start to energizing working relay (AR)
t20 22.1 s
Running time of programming mechanism until it switches itself off in the operating = start position (idle steps)
A
Gas valves controlled to evacuate the test space
B
Gas valves controlled to fill the test space
C
Vent valve, normally open; closed during valve proving test from the beginning of «Test1»
