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Building Technologies Division
CC1N7696en
20.04.2016
Connection examples without vent pipe to atmosphere (for applications not covered by EN676) using burner
controls type LFE..., LFL... or LGK..., or the control unit LEC...
Check following immediately the controlled shutdown in plants without vent pipe. Valve (A) or valve (A1) remains open
after the controlled shutdown until the start of the first test phase is reached in order to evacuate the test space and to
burn off the gas in the combustion chamber during the afterburn time.
2)
Expanding flame burner or interrupted pilot burner
LDU11
hr2
20
E
GP
N
B
A
R
14
15
18
1
17
16
3
ar2
4
2
EK2
5
III
6
4
LFE1
LEC1
LFL1...
LGK16...
8
9
W
5
11
19
12
hr1
XI
23
I
7
8
V
9
10
M2
N
5°/10°°
18°/17°°
17
7
AL
7696a12/0401
13
24
N
21
22
3
6
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 mini-
mum 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 atmospheric pressure. If this pressure
is exceeded during the test, lockout will be initiated.
Pressure switch (DW
G
) and pressure switch (DW
A
) must be overload-proof up to the gas pressure value.
16
17
DW
G
DW
A
15
7696a09/0796
Plants without vent pipe to atmosphere
SKP7...
GP
LDU
DW
) ( RB
P
L
A2
A1
LDU
DW
GP
LDU
DW
GP
LDU
DW
GP
Air pressure (PL) for the SKP7... must be sufficiently high to open the SKP7... although the burner’s air damper is
closed. Otherwise, the LDU11... will initiate lockout when performing «Test1».
