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