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Building Technologies Division CC1N7696en
20.04.2016
Connection examples with vent pipe to atmosphere using burner controls type LFE..., LFL... or LGK..., or the
control unit LEC...
For other connections, refer to the connection diagram of the relevant burner control.
Check just prior to burner startup Check during the prepurge time (min. 60 seconds)
2)
Expanding flame burner or interrupted pilot burner
2)
Expanding flame burner or interrupted pilot burner
N
LDU11
hr2
GP
E C
B
5
W
14
15
618
1
4
ar2
III
5
EK2
17
16
3
8
4
9
LFE1
LEC1
LFL1...
LGK16...
R
11
19
hr1
XI
2023
12
9
V
10
7
8
I
2
N
5°/10°°
18°/17°°
A
AL
13
N
242122
7696a07/0401
DW
2)
2)
N
LDU11
hr2
GP
CE B
4
14
W
14
15
6
18
1
3
ar2
III
5
EK2
17
16
4
LP
818
19
4
9
51213
LFE1
LEC1
LFL1...
LGK16...
R
11
2019
12
hr1
XI
23
N
9
10
V
7
8
I
2
5°/10°°
18°/17°°
A
AL
22
13
2421
N
7696a08/0401
DW
2)
2)
Valve proving test with 2 pressure switches
DW
G Pressure switch for the valve proving test with gas pressure.
This pressure switch must be set to the minimum gas pressure permitted during the proving test.
If this pressure is not reached during the test, lockout will be initiated.
DW
A Pressure switch for the gas valve proving test with atmospheric pressure.
This pressure switch must be set to the maximum gas pressure permitted during the proving test with at-
mospheric pressure.
If this pressure is exceeded during the test, lockout will be initiated.
Pressure switch (DW
G) and pressure switch (DWA) must be overload-proof up to the gas pressure value.
16
17
DW
G
DW
A
15
7696a09/0796
Plants with vent pipe (C) to atmosphere
DW
C
B
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