Siemens VALVEGYR LDU11.323A17 User manual

CC1N7696en
20.04.2016
Building Technologies Division
7696
VALVEGYR®
Valve Proving System for
automatic Shutoff Valves LDU11...
The LDU11... valve proving system is designed for use with shutoff valves in con-
nection with gas burners and gas appliances. In the event of inadmissible leakage,
the system prevents the burner from starting up.
The LDU11... system conforms to the requirements of EN1643 covering automatic
shutoff valves for use with gas burners and gas appliances to EN161.
The LDU11... and this Data Sheet are intended for use by OEMs which integrate the
valve proving system in their products.

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Use
The LDU11... is designed for automatic gas valve proving (leakage test) based on the
pressure proving principle. It is for use on gas-fired combustion plant with or without vent
pipe to atmosphere. In the case of plants with no vent pipe where EN standards apply,
the notes given in «Connection examples without vent pipe to atmosphere» must be
observed.
Used in connection with 1 or 2 commercially available pressure switches, valve proving is
automatically initiated with every burner startup, either
- prior to burner startup
- during the prepurge time if it lasts a minimum of 60 seconds
- immediately after a controlled shutdown, or
- on completion of the burner control’s control sequence, e.g. at the end of the
postpurge time
The valve proving test is based on the 2-stage pressure proving principle:
1. The valve on the mains side is tested by evacuating the test space and by monitoring
the atmospheric pressure in it.
2. The valve on the burner side is checked by pressurizing the test space and by moni-
toring the gas pressure.
If the pressure increases excessively during the first test phase called «Test1», or de-
creases excessively during the second test phase called «Test2», the LDU11.... will in-
hibit burner startup and initiate lockout. In that case, the lockout reset button will light up
to indicate the fault. Remote indication of the fault is also possible. A program indicator,
which stops whenever a fault occurs, indicates which of the valves is leaking. The
LDU11... can be reset either on the unit itself or via an electric remote reset facility.
Warning notes
To avoid injury to persons, damage to property or the environment, the following
warning notes must be observed.
Do not open, interfere with or modify the control unit.
All activities (mounting, installation and service work, etc.) must be carried out by
qualified staff
Before making any wiring changes in the connection area, completely isolate the
plant from mains supply (all-polar disconnection). Ensure that the plant cannot be in-
advertently switched on again and that it is indeed dead. If not observed, there is a
risk of electric shock hazard
Ensure protection against electric shock hazard by providing adequate protection for
the valve proving system’s connection terminals
Each time work has been carried out (mounting, installation, service work, etc.),
check to ensure that wiring is in an orderly state
Press the lockout reset button only manually (applying a force of no more than 10 N)
without using any tools or pointed objects
Do not press the lockout reset button on the unit for more than 10 seconds since
longer presses will destroy the lockout relay
Fall or shock can adversely affect the safety functions. Do not put such units into
operation, even if they do not exhibit any damage
Mounting notes
Ensure that the relevant national safety regulations are complied with

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Installation notes
Live and neutral conductors must not be interchanged
Standards and certificates
Applied directives:
Low-voltage directive 2014/35/EC
Directive for gas-fired appliances 2009/142/EC
Directive for pressure devices 97/23/EC and
2014/68/EC (2016-07-16)
Electromagnetic compatibility EMC (im-
munity) *)
2014/30/EC
*) The compliance with EMC emission requirements must be checked after the valve monitoring system is
installed in the equipment
Compliance with the regulations of the applied directives is verified by the adherence to
the following standards / regulations:
Safety and control devices for gas burners and gas burning ap-
pliances - Valve proving systems for automatic shut-off valves
DIN EN 1643
The relevant valid edition of the standards can be found in the declaration of con-
formity!

Note on DIN EN 60335-2-102
Household and similar electrical appliances - Safety - Part 2-102:
Particular requirements for gas, oil and solid-fuel burning appliances having electrical
connections.
The electrical connections of the LDU11 and the AGM comply with the requirements of
EN 60335-2-102.
EAC Conformity mark (Eurasian Conformity mark)
ISO 9001:2008
ISO 14001:2004
OHSAS 18001:2007
Certified complete with plug-in base:
Type reference
LDU11.323A17 --- x x x --- x
LDU11.323A27 --- x --- x --- x
LDU11.523A17 x --- x x x ---
LDU11.523A27 x --- --- x --- ---

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Life cycle
LDU11... has a designed lifetime* of 250,000 burner startup cycles which, under normal
operating conditions in heating mode, correspond to approx. 10 years of usage (starting
from the production date given on the type field). This lifetime is based on the endurance
tests specified in standard EN298 and the table containing the relevant test documenta-
tion as published by the European Association of Component Manufacturers (Afecor)
(www.afecor.org).
The designed lifetime is based on use of the LDU11... according to the manufacturer’s
Data Sheet. After reaching the designed lifetime in terms of the number of burner startup
cycles, or the respective time of usage, the LDU11... is to be replaced by authorized
personnel.
* The designed lifetime is not the warranty time specified in the Terms of Delivery
Disposal notes
The unit contains electric and electronic components and must not be disposed of to-
gether with domestic waste. Local and currently valid legislation must be complied with.

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Mechanical design
- Plug-in design
- Exchangeable unit fuse (including spare fuse)
- Made of impact-proof and heat-resistant black plastic
- Lockout reset button with viewing window showing:
– The fault signal lamp
– The lockout indication
- Coupled to the program spindle
- With transparent lockout reset button
- Easy-to-remember symbols indicating the type of fault and the time lockout
occurred
- Synchronous motor of the sequence switch with gear train and step action
sequence switch
- Camshaft with 15 nonadjustable cams
- Program indicator at the head of the camshaft
- 1 main and 1 auxiliary relay
- Lockout relay can be electrically reset from a remote location and provides the
«Lockout» and «Reset» functions
- Unit fuse and spare fuse
All electrical components are interconnected via printed circuits.
Type summary
Type reference Mains voltage t3 t4
LDU11.323A17 AC 100...110 V 2.5 s 2.5 s
LDU11.323A27 AC 220...240 V 2.5 s 2.5 s
LDU11.523A17 ¹) AC 100...110 V 5 s 5 s
LDU11.523A27 ¹) AC 220...240 V 5 s 5 s
t3 Filling the test space
t4 Evacuating the test space
¹) Valve opening times do not conform to EN1643
Ordering
Valve proving system LDU11... (without plug-in base) refer to «Type summary»
Plug-in base not included in the delivery, must be ordered as a separate item!
Connection accessories for medium-capacity refer to Data Sheet N7230
- Plug-in base AGM11 with Pg11 threads for cable entry glands
- Plug-in base AGM11.1 with M16 threads for cable entry glands
PTC resistor (AC 230 V) AGK25
- For load on terminal 4 of LMG2...
Valve proving system
LDU11...
Housing
Legend

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Technical data
Mains voltage
- LDU11.323A27
- LDU11.323A17
A
C 220 V –15 %...AC 240 V +10 %
A
C 100 V –15 %...AC 110 V +10 %
- LDU11.523A27 ¹)
- LDU11.523A17 ¹)
A
C 220 V –15 %...AC 240 V +10 %
A
C 100 V –15 %...AC 110 V +10 %
¹) Valve opening times do not conform to EN 1643
Mains frequency 50...60 Hz ±6 %
Unit fuse (built-in) T6.3H250V to DIN EN 60127
Primary fuse (external) Max. 10 A (slow)
Weight
A
pprox. 1000 g
Power consumption
- During the test
- During operation
A
pprox. AC 3.5 VA
A
pprox. AC 2.5 VA
Mounting position Optional
Degree of protection IP40 (to be ensured through mounting),
except the connection area (terminal base)
Safety class I
Perm. input current at terminal 1 Max. 5 A (peak current 20 A / 20 ms)
Perm. current rating of control terminals Max. 4 A (peak current 20 A / 20 ms)
Required current rating of pressure switch
(DW)
Min. 1 A, AC 250 V
Storage DIN EN 60721-3-1
Climatic conditions Class 1K3
Mechanical conditions Class 1M2
Temperature range -20...+60 °C
Humidity <95 % r.h.
Transport DIN EN 60721-3-2
Climatic conditions Class 2K2
Mechanical conditions Class 2M2
Temperature range -50...+60 °C
Humidity <95 % r.h.
Operation DIN EN 60721-3-3
Climatic conditions Class 3K5
Mechanical conditions Class 3M2
Temperature range -20...+60 °C
Humidity <95 % r.h.
Caution!
Condensation, formation of ice and ingress of water are not permitted!
General unit data
LDU11...
Environmental
conditions

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Function
During the first phase of the valve proving test called «Test1», atmospheric pressure
must exist in the length of pipe between the valves to be tested. In plants with a vent pipe
to atmosphere, atmospheric pressure is available if the valve proving test is made prior to
or during the prepurge time. In plants without vent pipe, atmospheric pressure is made
available as the valve proving system opens the valve on the burner side during evacuat-
ing the test space (t4). If the valve proving test LDU11... is performed after burner opera-
tion, the valve on the burner side after the controlled shutdown can be kept open until
evacuating the test space (t4) has elapsed, thus lowering the pressure in the test space
and making certain its gas content is burnt off in the combustion chamber during the
postpurge time. Prerequisite for this procedure is a suitable control program of the burner
control as provided by burner controls type LFE..., LFL..., LGK... or LEC...
The test space is closed off after evacuation. During the first test phase «Test1», which
then follows, the LDU11... checks with the pressure switch if the atmospheric pressure in
the test space is maintained. If the valve on the mains side is leaking, causing the pres-
sure to rise above the switching point of the pressure switch, the LDU11... will trigger an
alarm and initiate lockout. The program indicator then stops to indicate «Test1».
If the pressure does not increase because the valve closes correctly, the LDU11... con-
tinues its program with the second test phase «Test2». For that purpose, the valve on the
mains side is opened during filling the test space (t3) so that the test space is pressurized
(«filling» the test space). During the second test phase – if the valve on the burner side is
leaking – this pressure must not fall below the switching point of the pressure switch. If it
does, the LDU11... will initiate lockout also, thus preventing the burner from starting up.
On successful completion of the second test phase, the LDU11... closes the internal
control loop between terminals 3 and 6 (circuit path: terminal 3 - contact (ar2) - terminals
4 and 5 - contact III - terminal 6). This control loop is normally included in the burner con-
trol’s start control loop.
After the control loop has been closed, the programming mechanism of the LDU11...
returns to its start position to switch itself off. During these so-called idle steps, the posi-
tions of the programming mechanism’s control contacts remain unchanged.

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Program and lockout indicator
In the event of lockout, the programming mechanism stops and thus the position indicator
fitted to the spindle of the mechanism. The symbol that stops above the reading mark
indicates the test phase during which lockout occurred and also gives the number of
programming steps completed from the start of this test phase (1 step = 2.5 seconds).
►Start position = operating position
In plants without vent valve:
Evacuation of test space by opening the valve on the burner side
Test1 «Test1» with atmospheric pressure (valve proving test on the mains side)
Filling the test space by opening the valve on the mains side
Test2 «Test2» with gas pressure (valve proving test on the burner side)
I I I Idle steps until programming mechanism switches itself off
►Operating position = start position for the next valve proving test
In the event of lockout, all terminals receiving voltage from the valve proving system
LDU11... will be deenergized, except terminal 13, which is used for lockout indication.
After a reset, the programming mechanism automatically returns to its start position to
immediately program a new valve proving test.
Note!
Do not press the reset button for more than 10 seconds.
A power failure prior to evacuating the test space does not cause the control sequence to
change.
If a power failure occurs after the evacuation, the valve proving test will not be continued
when power is restored, but the programming mechanism first returns to its start position
and then performs the complete valve proving test.
Meaning of the sym-
bols:
Control sequence after
a power failure

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Calculation of the leakage rate escaping from a length of pipe
QLeck =(PG- PW) x V x 3600
Patm x tTest
Qleck in dm³/h Permissible leakage rate in dm³ per hour or liters per hour
PGin mbar Overpressure in pipe section between the valves to be tested, at
the beginning of the test phase
PWin mbar Overpressure set on pressure switch «DW» (normally set to 50
% of the gas mains pressure)
Patm in mbar Absolute pressure (1.013 mbar normal pressure)
V in dm³ Volume of test space confined by the valves to be tested, includ-
ing the space in the valves themselves
Ttest in s Duration of proving time
PG= 30 mbar
QLeck =(30 - 15) x 10.36 x 3600
1013 x 27.5 = 20 l/h
PW= 15 mbar
Patm
V
= 1013 mbar
= 10.36 dm³
Any valve leakage rate exceeding 20 l/h causes the LDU11...
to initiate lockout
tTest = 27.5 s

Note!
Select volume of pipe section (V) between the gas valves to be checked and over-
pressure (PW) set on pressure switch (DW) such that the maximum permissible gas
leakage rate (QLeck) will not exceed the rate specified in the local regulations.
Legend
Example

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Connection diagram
M
~
L
EK2
18 1
SK
1)
AS ar2
345
III
6
ab
I
8
ab
V
10 12 19 23 20
aba
b
XI hr1
22 21 24
hr2 HR
b
a
XIII
ab
IX
ar1
br1
IV
15 14
16 17
PGP
DW
Atm. Gas VII
ba
VIII
ab
ar3
ba
VI
AR
br2
BR
L1
EK1
1
)
13
AL
N
27911
SM
LDU11
7696a15/0204
S
i
Legend
AL Alarm signal for «leaking valve»
AR Working relay with contacts (ar...)
AS Unit fuse (built-in)
BR Lockout relay with contacts (br...)
DW Pressure switch for valve proving test (does not replace the gas pressure switch used to signal lack of gas)
EK1 Lockout reset button
EK2 Remote lockout reset button
GP Gas pressure switch (for lack of gas)
HR Auxiliary relay with contacts (hr...)
L1 Lockout warning lamp (built-in)
Si External primary fuse
SK Control contact (for initiating the valve proving test)
SM Synchronous motor of programming mechanism
1) Do not press lockout reset button (EK) for more than 10 seconds

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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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Connection examples with vent pipe to atmosphere using burner controls type LGB2..., LGB3... / LGB4... /
LMG2...
For other connections, refer to the connection diagram of the relevant burner control.
Valve proving test prior to burner startup Valve proving test following immediately the controlled
shutdown
LDU11
17
DW
2
C
54
hr1
GP
23
1116
15
E
B
6
III
ar2
3
SB / R / W
N
1
12
LGB2.../3.../4.../LMG2...
H
L
hr2
XI
20
14 1912 22
5
34
A2
A1
M
N
AL
13
2421
10
7696a05
/
0403
N
L
LDU11
22
5
4
2
C
hr1
7
B
11
E
12
P
III
1
16
14 15
DW
ar2
17 3
LGB2.../3.../4.../LMG2...
H
6
hr2
19 23 20
I
812
XI
SB / R / W
A2 A1
5
GP
3
M
N
13
AL
21 24
4
7
696
a
06/0
7
03
AGK25 3)
³) Only in connection with LMG2...
Plants with vent pipe to atmosphere
GP
E
C
BDW
LDU
AA2
A1
C
DW
LDU
B
GP
E
7696s01/0695
Connection examples with vent pipe to atmosphere using burner controls type LFE..., LFL... or LGK..., or the
control unit LEC...
Check during the prepurge time (min. 60 seconds) and
following immediately the controlled shutdown in plants
with vent pipe to atmosphere. Delay on make of relay
d >2 seconds.
2) Expanding flame burner or interrupted pilot burner
Check following immediately the controlled shutdown
2) Expanding flame burner or interrupted pilot burner
N
LDU11
hr2
GP C
14
15
18 1
EK2
2
17
16
6
III
53
ar2
4
B
E
11
201912
hr1
XI
23
8
I
7
10
V
9
14
W
2
d
LFE1
LEC1
LFL1...
LGK16...
18 199
12 13
4
LP
8
5
R
N
45°/10°°
18°/17°°
A
AL
22
13
2421
N
7696a10/0401
DW
2)
2)
LDU11
hr2
GP C
N
BE
6
W
14
15
18 1
17
16
III
53
ar2
4
2
EK2
4
LFE1
LEC1
LFL1...
LGK16...
8
R
N
11
20
19
12
hr1
XI
23
I
7
10
V
9
8
5°/10°°
18°/17°°
A
9
5
AL
7696a11/0401
22
13
2421
N
DW
2)
2)

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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 14
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 13
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
DWGPressure 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.
DWAPressure 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 (DWG) and pressure switch (DWA) must be overload-proof up to the gas pressure value.
16
17
DWGDWA15
7696a09/0796
Plants with vent pipe (C) to atmosphere
DW
C
B
A
LDU
C
DW
B
LDU
A2
7696s02/0709
) ( RB
C
B
DW
LDU
A
C
B
DW
LDU
A
SKP7...

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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...
89
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
2122
3
6
DW
2)
2)
Valve proving test with 2 pressure switches
DWGPressure 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.
DWAPressure 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 (DWG) and pressure switch (DWA) must be overload-proof up to the gas pressure value.
16
17
DWGDWA15
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».

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Connection examples without vent pipe to atmosphere using burner controls type LGB2... / LGB3... / LGB4... /
LMG2...
For other connections, refer to the connection diagram of the relevant burner control.
Check prior to burner startup Check following immediately the controlled shutdown
N
LDU11
hr2
22
A1
GP
E
B
N
DW
15
134
ar2
17
16
SB / R / W
2
56
III
LGB2.../3.../4.../LMG2... 12
LH
92311
20
10
hr1
VXI
12 14 19
53
MA2
4
AL
13
24
21
N
10
7
696
a
13/0403
LDU11
hr2
22
E
N
BA1
15
ar2
17
16 III
214
DW
P
GP
LH
6
5
431
12
LGB2.../3.../4.../LMG2...
N
hr1
11
97
20
23
19
10
812
IVXI
A2
5
3
M
N
AL
13
N
24
21
4
SB / R / W
7696
a
14/0703
N
AGK253)
³) Only in connection with LMG2...
Plants without vent pipe to atmosphere
GP
EB
DW
LDU
AA2
A1
DW
LDU
B
GP
E
7696s04/0695

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Connection examples without 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
LDU11
hr2
GP E
N
B
A
W
14
15
618 1
ar2 III
EK2
17
16
345
DW
8
4
9
LFE1
LEC1
LFL1...
LGK16...
R
11
19
hr1
XI
20
23
12
7
8
I
2 9
10
V
5
5°/10°°
18°/17°°
AL
13
N
2421
22
7696a24/0401
2)
2)
N
LDU11
hr2
GP EB
A
14
W
14
15
618 13
ar2 III
5
EK2
17
16
4
LP
818
19
4
9
512
13
LFE1
LEC1
LFL1...
LGK16...
R
11
20
19
hr1
XI
23
12
7
8
I
2 9
10
V
45°/10°°
18°/17°°
AL
22
13
24
21
N
7696a25/0401
DW
2)
2)
Valve proving test with 2 pressure switches
DWGPressure 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.
DWAPressure 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 (DWG) and pressure switch (DWA) must be overload-proof up to the gas pressure value.
16
17
DWGDWA15
7696a09/0796
Plants without vent pipe to atmosphere
SKP7...
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».

17/21
Building Technologies Division CC1N7696en
20.04.2016
Connection examples without vent pipe to atmosphere using burner controls type LFE..., LFL... or LGK..., or
control unit LEC... and actuator SKP7... with expanding flame burners
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)
LDU11
22
GP E
N
B
A
2
W
6
14
15
18
1
ar2
III
EK2
17
16
DW 45
3
LP
14
818 19
4
9
12 13
LFE1
LEC1
LFL1...
LGK16...
R
5
4
N
hr2
11
2019
hr1
XI
23
12
7
8
I
9
10
V
5°
18°
T
AL
M
13
24
21
N
6/7
3/17
7696a26/0401
LDU11
GP E
N
B
A
2
LP
W
6
14
15
18 1
ar2 III
EK2
17
16
DW 45
3
14
81819
4
9
12 13
LFE1
LEC1
LFL1...
LGK16...
R
4
5
hr2
11
2019
hr1
XI
23
12
7
8
I
9
10
V
M
5°
18°
AL
13
2421
N
22
N
6/7
3/17
7696a27/0401
Valve proving test with 2 pressure switches
DWGPressure 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.
DWAPressure 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 (DWG) and pressure switch (DWA) must be overload-proof up to the gas pressure level.
16
17
DWGDWA15
7696a09/0796
Plants without vent pipe to atmosphere
GP
BE
DW
A
SKP7...

18/21
Building Technologies Division CC1N7696en
20.04.2016
Connection examples without vent pipe to atmosphere using burner controls type LME21.xxxC... /
LME22.xxxC... with expanding flame burners
For other connections, refer to the connection diagram of the relevant burner control.
LME22.xxxC... / LME22.xxxC... with LDU11... valve proving
Before startup of burner
In the case of plants without vent pipe to atmosphere
NT
RESET
A2
Z
AL
T
T
R / W
Gpmin
STB
7101a28e/0210
LP
EK2
K1
K2/1 K3 K4K2/2
N
K5
1)
LDU11...
HR
DW
Gas
A
tmospheric
A1 B
E
Iar2 hr1 hr2 III V XI
MM
1)
LME21.xxxC...
LME22.xxxC...
GP
LDU LDU
GP
1) Fan motor connected to terminal 3 of the LME22.xxxC.... / LME22.xxxC...
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. There-
fore, the maximum permissible response time of the air pressure switch is 180 se-
conds
With the LDU11…, faults during valve proving lead to lockout and, with the
LME22.xxxC.... / LME22.xxxC..., to lockout due to air pressure switch timeout (blink
code 03)
Note!
A faulty air pressure switch (switch does not make) leads to lockout (blink code 03)
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 can be connected either to terminal 3 in connection with a link be-
tween terminals 6 and 24 of the LDU11... (motor active during valve proving) or to
terminal 6 of the LDU11... (motor active on completion of successful valve proving)

19/21
Building Technologies Division CC1N7696en
20.04.2016
Connection examples with vent pipe to atmosphere using burner controls type LME21.xxxC... / LME22.xxxC...
with expanding flame burners
For other connections, refer to the connection diagram of the relevant burner control.
LME22.xxxC... / LME22.xxxC... with LDU11... valve proving
Valve supervision before startup of burner
In the case of plants with vent pipe to atmosphere
NT
RESET
A2
Z
AL
T
T
R / W
Gpmin
STB
7101a29e/0210
LP
EK2
K1
K2/1 K3 K4K2/2
N
K5
1)
LDU11...
HR
DW
Gas
A
tmospheric
CB
E
Iar2hr1 hr2 III V XI
A1
MM
1)
LME21.xxxC...
LME22.xxxC...
GP GP
1) Fan motor connected to terminal 3 of the LME22.xxxC... / LME22.xxxC...
Valve proving is started each time the system is switched on, with connection of ter-
minal 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
LME22.xxxC... / LME22.xxxC..., to lockout due to air pressure switch timeout (blink
code 03)


Note!
A faulty air pressure switch (switch does not make) leads to lockout (blink code 03)
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 can be connected either to terminal 3 in connection with a link between
terminals 6 and 24 of the LDU11... (motor active during valve proving) or to terminal 6
of the LDU11... (motor active on completion of successful valve proving)

20/21
Building Technologies Division CC1N7696en
20.04.2016
Legend
A, A1, A2 Gas valves controlled to evacuate the test space
AGK25 PTC resistor
AL Alarm signal for «leaking valve»
ar... Contacts (operating relay)
B Gas valve controlled to fill the test space
C Vent valve, normally open; closed during valve proving test from the be-
ginning of «Test1»
DW Pressure switch for valve proving test (does not replace the gas pressure
switch used to signal lack of gas)
E Safety shutoff valve, dead closed (optional)
EK Lockout reset button (internal)
EK2 Remote lockout reset button
FSV Flame signal amplifier
GP Gas pressure switch (for lack of gas)
H Main switch
ION Ionization probe
K1...4 Internal relays
hr... Contacts (auxiliary relay)
LP Air pressure switch
M... Fan («M2»: pre- and postpurging)
NT Power supply
PL Reference pressure for SKP7...
R Control thermostat or pressurestat (e.g. boiler control thermostat)
RB Pipe orifice; its diameter must be determined such that in the event of a
leaking ignition gas valve (A), the ignition flame cannot afterburn on com-
pletion of the second safety time so that presence of the main flame can-
not be simulated
SB Safety limit thermostat
STB Safety limit thermostat
T Delay off time relay; the time should be set to approx. «t16» (min. «t7»...
max. «t10») of the burner control
W Limit thermostat or pressure switch or pressure limiter
Z Ignition transformer
t7 Interval between start command and power at terminal 7 (start delay for
«M2»)
t10 Interval from start to the beginning of the air pressure check, excluding
running time of air damper
t16 Interval until OPEN command for the air damper is given