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Building Technologies Division CC1N7696en
20.04.2016
Sequence diagram
ABC
I
III
IV
V
VI
VII
VIII
IX
XI
XIII
AR
Test1 Test2
78
56
9
910
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»
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