7 696

ISO 9001

VALVEGYR®

Gas Valve Proving System LDU11...

Series ...A...

The LDU11... control unit is designed for gas valve proving in gas-fired combus-
tion plant equipped with 2 safety shutoff valves.
During each startup cycle, the control unit automatically programs the valve
proving test and, in the event of leakage, prevents the burner from starting up.

The LDU11... and this Data Sheet are intended for use by OEMs which integrate
the gas valve proving system in their products.

CC1N7696en
Siemens Building Technologies
09.10.2001 HVAC Products
Use

The LDU11... control unit is designed for automatic gas valve proving (leakage test)
based on the pressure proving principle.
It is for use in 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 one or two commercially available pressure switches, gas
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 the controlled shutdown, or
- on completion of the burner control’s control program, e.g. at the end of the post-
purge time

The valve proving test is based on the 2-stage pressure proving principle:
1. First test phase: the valve on the mains side is tested by evacuating the test space
and by monitoring the atmospheric pressure in it.
2. Second test phase: the valve on the burner side is checked by pressurizing the test
space and by monitoring the gas pressure.

If the pressure increases excessively during the first test phase «Test1», or decreases
excessively during the second test phase «Test2», the control unit will inhibit 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 control unit can be reset either on the unit itself or via an electric remote resetting
facility.

Warning notes

To avoid injury to persons, damage to property or the environment, the following

warning notes should be observed.

Do not open, interfere with or modify the unit.

• Before performing any wiring changes in the connection area of the LDU11...,
completely isolate the unit from the mains supply (all-polar disconnection)
• Ensure protection against electric shock hazard by providing adequate protection
for the control unit’s terminals
• Check wiring and all safety functions
• Fall or shock can adversely affect the safety functions. Do not put such units into
operation, even if they do not exhibit any damage

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Mounting notes

• Observe the relevant national safety regulations

Installation notes

• Installation, commissioning and maintenance work must be carried out by qualified

staff
• Always run ignition cables separate from the unit and other cables while observing
the greatest possible distances

Commissioning notes

Commissioning and maintenance work must be carried out by qualified staff.

Disposal notes

The unit contains electric and electronic components and may not be disposed of to-
gether with household garbage.
Local and currently valid legislation must be observed.

Mechanical design

The control unit is of plug-in design. Housing and plug-in base are made of impact-
proof and heat-resistant plastic.

The housing contains:

- The synchronous motor of the sequence switch with its geartrain and step action
sequence switch
- The camshaft with its 15 nonadjustable cams
- The program indicator at the head of the camshaft
- One main and one auxiliary relay
- The lockout relay which can be electrically reset from a remote location and which
provides the «Lockout» and «Reset» functions
- The unit fuse and a spare fuse

All electrical components are interconnected via printed circuits.

The plug-in base carries the following terminals:

- 24 connection terminals
- 2 auxiliary terminals («31» and «32»)
- 3 earth terminals
- 3 neutral terminals, prewired to terminal 2 (neutral input)

The following knockout holes are available for cable entry:

- 14 knockout holes for cable entry by means of cable glands, 8 at the side and 6 at
the bottom of the base
- 6 threaded knockout holes at the side for cable entry glands Pg11 or M16

Plug-in base and terminals are designed such that erroneous plugging in of a unit with
the same housing, which is not suited for use with the relevant burner, is made impos-
sible. Visible in the transparent lockout reset button, the program indicator informs
service staff about the program sequence, the type of fault and the point in time the
fault occurred, using easy-to-remember symbols.

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Ordering

Control unit for gas valve proving, without plug-in base

- For AC 220...240 V, 50…60 Hz LDU11.323A27
- For AC 100...110 V, 60…60 Hz LDU11.323A17
- For AC 220...240 V, 50...60 Hz LDU11.523A27
- For AC 100...110 V, 50...60 Hz LDU11.523A17

Plug-in base AGM11

Technical data

General unit data Mains voltage

- LDU11.323A27 AC 220 V –15 %...AC 240 V +10 %
- LDU11.323A17 AC 100 V –15 %...AC 110 V +10 %
- LDU11.523A27 AC 220 V –15 %...AC 240 V +10 %
- LDU11.523A17 AC 100 V –15 %...AC 110 V +10 %

Mains frequency 50...60 Hz ±6 %

Power consumption
- During the test 3.5 VA
- During operation 2.5 VA
Primary fuse (external) T10 / 500V
Unit fuse T6.3H250V to IEC 127
Perm. input current at terminal 1 5 A continuously to VDE 0660 AC3
Perm. current rating of control terminals 4 A to VDE 0660 AC3
Required switching capacity
of pressure switch «DW» min. 1 A, AC 250 V
Mounting orientation optional
Degree of protection IP 40
Weight
- LDU11... approx. 1000 g
- Plug-in base approx. 165 g

Environmental Transport IEC 721-3-2

conditions Climatic conditions class 2K2
Mechanical conditions class 2M2
Temperature range -50...+60 °C
Humidity < 95 % r.h.
Operation IEC 721-3-3
Climatic conditions class 3K5
Mechanical conditions class 3M2
Temperature range -20...+60 °C
Humidity < 95 % r.h.
Condensation, formation of ice and ingress of water are not permitted!

CE conformity
According to the directives of the European Union
Electromagnetic compatibility EMC 89 / 336 EEC incl. 92 / 31 EEC
Directive for gas appliances 90 / 396 EEC

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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 2 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 control unit
opens the valve on the burner side during the time «t4».
If the valve proving test is performed after burner operation, the valve on the burner
side after the controlled shutdown can be kept open until «t4» has elapsed, thus re-
ducing 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 Landis & Staefa burner controls LFE..., LFL..., LGK... or LEC...

The test space is closed off after it has been evacuated. During the first test phase
«Test1», which then follows, the control unit checks with the pressure switch if the at-
mospheric pressure in the test space is maintained.
If the valve on the mains side is leaking, causing the pressure to rise above the switch-
ing point of the pressure switch, the control unit will trigger an alarm and initiate lock-
out. The program indicator then stops to indicate «Test1».

If the pressure does not increase because the valve closes correctly, the control unit
continues its program with the second test phase «Test2».
For that purpose, the valve on the mains side is opened during «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
may not fall below the switching point of the pressure switch. If it does, the control unit
will initiate lockout also, thus preventing the burner from starting up.

On successful completion of the second test phase, the control unit closes the internal
control loop between terminals 3 and 6 (circuit path: terminal 3 – contact «ar2» - termi-
nals 4 and 5 – contact III – terminal 6).
This control loop is normally included in the start control loop of the burner control.

After the control loop has been closed, the programming mechanism of the control unit
returns to its start position to switch itself off.
During these so-called idle steps, the positions of the programming mechanism’s con-
trol contacts remain unchanged.

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Program and lockout indicator

In the event of lockout, the programming mechanism stops and thus the position indi-
cator 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).

Meaning of the symbols

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)

III 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 control unit 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.

Control program after A power failure prior to evacuating the test space does not cause the program se-
a power failure quence to change.

If a power failure occurs after the evacuation, the valve proving test will not be contin-
ued when power is restored, but the programming mechanism first returns to its start
position and then performs the complete valve proving test.

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Calculating the leakage rate escaping from a length of pipe

(PG -P w x x

Q
Leck = Patm x t Test

Legend Qleck in dm³ / h Permissible leakage rate in dm³ or liters per hour
PG in mbar Overpressure in pipe section between the valves to be tested, at
the beginning of the test phase
PW in mbar Overpressure set on pressure switch «DW» (normally set to 50
% of the gas mains pressure)
Patm in mbar Absolute pressure (1013 mbar normal pressure)
V in dm³ Volume of test space confined by the valves to be tested, in-
cluding the space in the valves themselves
Ttest in s Duration of proving time

Example PG = 30 mbar QLeck =

(30-15) x 10.36 x 3600
= 20 l/h
1013 x 27.5
PW = 15 mbar
Patm = 1013 mbar Any valve leakage rate exceeding 20 l/h causes the control unit
to initiate lockout
V = 10.36 dm³
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.

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Connection diagram

L
Legend
AL Alarm signal for «leaking valve» 1)
EK2 SK
AR Main relay with contacts «ar...» 7696a15/0695
18 1 3 4 5 6 8 10 12 19 23 20 22 21 24
AS Unit fuse (built-in)
a b a b a b a b
BR Lockout relay with contacts «br...» AS ar2 III I V XI hr1
hr2 HR
DW Pressure switch for valve proving test
br1
(does not replace the gas pressure XIII
IX
ar1
switch used to signal lack of gas) a b a b
15 14
EK1 Lockout reset button
EK2 Remote lockout reset button
GP Gas pressure switch (for lack of gas) IV Atm. P GP VII
Gas

HR Auxiliary relay with contacts «hr...» DW

L1 Lockout warning lamp (built-in) 16 17

VI VIII
SK Control contact b a b a
AR a b
(for initiating the valve proving test)
ar3
SM Synchronous motor of programming
1) L1
mechanism EK1 br2 M
~
SM
BR
1) Do not press «EK...» for more than
10 seconds 13 2 7 9 11
LDU11
AL
N

Sequence diagram

A B C
Legend t5
a
t1 22.5 s First test phase with atmospheric I b 7 8
t20
pressure III 5 6

t2 27.5 s Second test phase with gas IV

pressure t4 t1 9
a
V b
t3 5s Filling the test space 9 10

2.5 s with LDU11.323… VI a

b

5s with LDU11.523 VII

t4 5s Evacuating the test space a
VIII b
2.5 s with LDU11.323… t6
a
5s with LDU11.523 IX b
t3 t2 11 15
t5 67.5 s Total duration of valve proving a
XI b
test until burner is enabled 11 12

XIII a
t6 7.5 s Interval from start to energizing b

main relay «AR» AR

t20 22.5 s Running time of programming
mechanism until it switches itself Output terminals
Test1 Test2 controlled by the
off in the operating = start posi- control unit or
electrically
tion (idle steps) 7696b01e/0601 connected
Program indication

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 LMG2…, LGB2... , LGB3... or
LGB4...

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
7696a05/0401 7696a06/0401
LMG2.../LGB2.../3.../4... LMG2.../LGB2.../3.../4... 12 3 5 4
12 3 4 5 10
SB / R / W

H
M A2 A1
L
H M A1 A2 L
N P GP
N
SB / R / W
DW

1 3 6 12 14 19 20 22 21 24
14 15 16 17 3 1 6 8 12 19 23 20 22 21 24
hr2
III hr2
ar2 XI hr1
17 15 N ar2 III I XI hr1 N
2 4 5 16 11 23 LDU11 13
GP 2 4 5 7 11 LDU11 13
DW
C E B AL
C B E AL

Plants with vent pipe to atmosphere

LDU LDU

GP DW GP DW
A1 A2
E B A E B

C C

7696s01/0695

Connection examples with vent pipe to atmosphere using burner controls LFE..., LFL... or LGK..., or the
control unit LEC...

Valve proving test during the prepurge time (min. 60 s) Valve proving test following immediately the controlled
and following immediately the controlled shutdown in shutdown
plants with vent pipe to atmosphere.
2)
Delay on make of relay d > 2 s. Expanding flame burner or interrupted pilot burner
2)
Expanding flame burner or interrupted pilot burner
7696a10/0401 7696a11/0401
LFE1 LFE1
LEC1 8 9 18 19 4 5°/10°° 2)
LEC1 8 9 5°/10°° 2)

LFL1... LFL1...
LGK16... 4 5 12 13 14 18°/17°° 2)
LGK16... 4 5 18°/17°° 2)

W
A A
R LP
N
W N

d R
EK2
18 1 3 4 5 6 8 10 12 19 23 20 22 21 24
DW
2 16 hr2
ar2 III
17 I V XI hr1 N
EK2
18 1 34 5 6 8 10 12 19 23 20 22 21 24 15 14 2 7 9 11 LDU11 13
DW
16 hr2
ar2 III
I V XI hr1 N
17 GP C E B AL
15 14 2 7 9 11 LDU11 13
N

GP C E B AL
N

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HVAC Products 09.10.2001
Connection examples with vent pipe to atmosphere using burner controls LFE..., LFL... or LGK..., or the
control unit LEC...

For other connections, refer to the connection diagram of the relevant burner control.

Valve proving test just prior to burner startup Valve proving test during the prepurge time (min. 60 s)
2) 2)
Expanding flame burner or interrupted pilot burner Expanding flame burner or interrupted pilot burner

7696a07/0401 7696a08/0401
LFE1 LFE1
LEC1 8 9 5°/10°° 2)
LEC1 8 9 18 19 4 5°/10°° 2)

LFL1... LFL1...
LGK16... 4 5 18°/17°° 2) LGK16... 4 5 12 13 14 18°/17°° 2)

A W
A
W

R N N
R LP

EK2 EK2
18 3 4 5 6 8 10 12 19 23 20 22 21 24 18 1 3 4 5 6 8 10 12 19 23 20 22 21 24
DW 1 DW
16 hr2 16 hr2
III ar2 III
ar2 I V XI 17 I V XI hr1
17 hr1 N N
15 14 2 7 11 13 15 14 2 7 9 11 LDU11 13
9 LDU11

GP AL GP E C B AL
E C B
N N

Valve proving test with 2 pressure switches

DWG 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, the control unit will initiate lockout.

DWA 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, the control unit will initiate lockout.

DWG and DWA must be overload-proof up to the gas pressure level.

16

17

DWG 15
DWA

7696a09/0796

Plants with vent pipe to atmosphere

SKP70
LDU LDU

GP DW GP DW
A1 A2
E B A E B

C C

7696s02/0695

LDU LDU

GP DW GP DW
E B A E C

C
B ) ( RB A

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HVAC Products 09.10.2001
Connection examples without vent pipe to atmosphere (for applications not covered by EN 676) using burner
controls LFE..., LFL... or LGK..., or the control unit LEC...

Valve proving test following immediately the controlled shutdown in plants without vent pipe.
Valve «A» or «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

7696a12/0401
LFE1
LEC1 8 9 5°/10°° 2) 17 3

LFL1...
LGK16... 4 5 18°/17°° 2) 7 6

W
M2
R N

EK2
18 1 3 4 5 6 8 10 12 19 23 20 22 21 24
DW
16 hr2
ar2 III I V XI
17 hr1 N
15 14 2 7 9 11 LDU11 13

GP E A B AL

Valve proving test with 2 pressure switches

DWG 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, the control unit will initiate lockout.

DWA 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, the control unit will initiate lockout.

DWG and DWA must be overload-proof up to the gas pressure level.

16

17

DWG 15
DWA

7696a09/0796

Plants without vent pipe to atmosphere

PL
LDU SKP70 LDU

GP DW GP DW
A1 A2
E B A E B

7696s03/0695
LDU LDU

GP DW GP DW
E B A E

) ( RB
B A

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Siemens Building Technologies CC1N7696en

HVAC Products 09.10.2001
Connection examples without vent pipe to atmosphere using burner controls LMG2..., LGB2... , LGB3... or
LGB4...

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

7696a13/0401 7696a14/0401
LMG2.../LGB2.../3.../4... 12 3 4 5 10 LMG2.../LGB2.../3.../4... 12 3 5 4

H M SB / R / W
L A2 M A2
N N
GP P N

SB / R / W
H
L

DW 1 3 4 5 6 10 12 14 19 20 22 21 24 1 3 4 5 6 8 10 12 19 23 20 22 21 24
DW
16 hr2 16 hr2
ar2 III XI ar2 III
17 V I V XI
hr1 N 17 hr1 N
15 2 9 11 23 13 15 14 2 7 9 11 13
LDU11 LDU11
GP

A1 B E AL AL
E A1 B
N N

Plants without vent pipe to atmosphere

LDU LDU
7696s04/0695
GP DW GP DW
A1 A2
E B A E B

Legend A, A1, A2 Gas valves controlled to evacuate the test space

AL Alarm signal for «Leaking valve»
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, normally closed (optional)
EK2 Remote lockout reset button
GP Gas pressure switch (for lack of gas)
H Main switch
LP Air pressure switch
M... Fan («M2»: pre- and postpurging)
PL Reference pressure for SKP70...
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 pilot gas valve «A», the pilot flame cannot afterburn on completion
of the second safety time so that presence of the main flame cannot be
simulated
SB 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

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HVAC Products 09.10.2001
Connection examples without vent pipe to atmosphere using burner controls LFE..., LFL... or LGK..., or the
control unit LEC...

For other connections, refer to the connection diagram of the relevant burner control.

Valve proving test just prior to burner startup Valve proving test during the prepurge time (min. 60 s)
2) 2)
Expanding flame burner or interrupted pilot burner Expanding flame burner or interrupted pilot burner

7696a24/0401 7696a25/0401
LFE1 LFE1
LEC1 8 9 5°/10°° 2)
LEC1 8 9 18 19 4 5°/10°° 2)

LFL1... LFL1...
LGK16... 4 5 18°/17°° 2) LGK16... 4 5 12 13 14 18°/17°°2)

W W

R LP
R

EK2 EK2

DW 18 1 34 5 6 8 10 12 19 23 20 22 21 24 18 1 3 4 5 6 8 10 12 19 23 20 22 21 24
DW
16 hr2 16 hr2
ar2 III ar2 III
17 I V XI hr1 17 I V XI
N hr1 N
15 14 2 7 9 11 LDU11 13 15 14 2 7 9 11 13
LDU11

GP E A B AL GP E A B AL

N N

Valve proving test with 2 pressure switches

DWG 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, the control unit will initiate lockout.

DWA 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, the control unit will initiate lockout.

DWG and DWA must be overload-proof up to the gas pressure level.

16

17

DWG 15
DWA

7696a09/0796

Plants without vent pipe to atmosphere

LDU LDU

GP DW GP DW
E B A E

) ( RB
7696s05/0695 B A

LDU LDU P
L
SKP70

GP DW GP DW
A1 A2 E
E B

) ( RB
B A

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Connection examples without vent pipe to atmosphere using burner controls LFE..., LFL... or LGK..., or
control unit LEC... and the SKP70... with expanding flame burners

For other connections, refer to the connection diagram of the relevant burner control
.
Valve proving test just prior to burner startup Valve proving test during the prepurge time (min. 60 s)

7696a26/0401 7696a27/0401
LFE1 LFE1
LEC1 8 9 18 19 4 5° 3/17 LEC1 8 9 18 19 4 5° 3/17
LFL1... LFL1...
LGK16... 4 5 12 13 14 18° 6/7 4 5 12 13 14 6/7
LGK16... 18°

T
W
N M W
R LP LP
R N
M
EK2
EK2
18 3 4 5 6 8 10 12 19 23 20 22 21 24
DW
16 1 hr2 DW 18 1 3 4 5 6 8 10 12 19 23 20 22 21 24
ar2

17 III I V XI 16 hr2
hr1 N ar2 III
17 I V XI hr1
15 14 2 7 9 11 LDU11 13 N
15 14 2 7 9 11 13
LDU11

GP E A B AL

N GP E A B AL

Valve proving test with 2 pressure switches

DWG 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, the control unit will initiate lockout.

DWA 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, the control unit will initiate lockout.

DWG and DWA must be overload-proof up to the gas pressure level.

16

17

DWG 15
DWA

7696a09/0796

Air pressure «PL» for the SKP... must be sufficiently high to open the SKP70... although the burner’s air damper is
closed.
Otherwise, the LDU11... will initiate lockout when performing «Test1».

Plants without vent pipe to atmosphere

SKP70
LDU

GP DW
E B A

C 7696A02/0796

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Dimensions

Dimensions in mm

1,5
LDU11... with plug-in
base AGM11...

123
25 25
6
18,9

15,5

7,5 5 7
15 15 15

7696m02/0296
27,5 27,5

37

103
7,5

103

40 18,5 13,5 5,7

AGM11 5,2x6,7

13 14 15 16 17 18 19 20 21 22 23 24
12
7,5 18,9
51,5 11
40
10 5,7
9
1 12,8
8
31
7
13 4,4 15
6

5
13,8
51,5 4
N 1,5 25
3
32
2

1
5,2 5,2x6,7
7696m01/0296

5,7 12,8 40

51,5 51,5

2001 Siemens Building Technologies AG

Subject to change 15/15

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HVAC Products 09.10.2001