Siemens LME11 series User manual

CC1N7101en

29.06.2006

Building Technologies

HVAC Products

7101

Gas Burner Controls LME...

Gas burner controls for the supervision of 1- or 2-stage gas burners of small to

medium capacity (typically up to 350 kW), in intermittent operation.

The LME… and this Data Sheet are intended for use by OEMs which integrate the

burner controls in their products.

Use, features LME… burner controls are used for the startup and supervision of 1- or 2-stage gas

burners in intermittent operation. The flame is supervised by an ionization probe or

flame detector QRA… with ancillary unit AGQ3… or blue–burning flames with blue-

flame detectors QRC...

In terms of housing dimensions, the LME... are identical with the LGB… and LMG…

burner controls (refer to «Type summary»).

- Burner controls conforming to EN 298

- For gas burners with fans conforming to EN 676

- Undervoltage detection

- Air pressure supervision with functional check of the air pressure switch during

startup and operation

- Electrical remote reset facility

- Multicolor indication of fault status and operational status messages

- Limitation of the number of repetitions

- Accurate control sequence thanks to digital signal handling

- Controlled intermittent operation after 24 hours of continuous operation

Use

Features

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Warning notes

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

warning notes should be observed!

Do not to open, interfere with or modify the unit!

•All activities (mounting, installation and service work, etc.) must be performed by

qualified staff

•Before making any wiring changes in the connection area of the LME…, completely

isolate the burner control from the mains supply (all-polar disconnection)

•Ensure protection against electric shock hazard by providing adequate protection

for the burner control’s connection terminals

•Check the connecting lines of the air pressure switch for short-circuits (connection

terminals 3, 6 and 11)

•Press the lockout reset button / operation button only manually (applying a force of

no more than 10 N) without using any tools or pointed objects

•Fall or shock can adversely affect the safety functions. Such units must not be put

into operation, even if they do not exhibit any damage

•Each time work has been carried out (mounting, installation, service work, etc.),

check to ensure that wiring is in an orderly state and make the safety checks as

described in «Commissioning notes»

Engineering notes

•When used in connection with actuators, there is no position feedback signal from

the actuator to the burner control

•When used in connection with actuators, the requirements of EN 676 must be ob-

served

•The running times of the actuators must match the burner control’s program. An

additional safety check of the burner control together with the actuators is required

•When substituting burner controls type LGB… or LMG… by LME…, the AGQ1… or

AGQ2… ancillary unit must be replaced by the AGQ3…

Mounting notes

•Ensure that the relevant national safety regulations are complied with

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Installation notes

•Always run the ignition cables separate from the unit and other cables while ob-

serving the greatest possible distance

•Do not mix up live and neutral conductors

•Install switches, fuses, earthing, etc., in compliance with local regulations

•The connection diagrams show the burner controls with earthed neutral conductor.

In networks with nonearthed neutral conductor and ionization current supervision,

terminal 2 must be connected to the earth conductor via an RC unit (type reference

ARC 4 668 9066 0). It must be made certain that local regulations are complied

with (e.g. protection against electric shock hazard) since AC 230 V / 50 Hz mains

voltage produces peak leakage currents of 2.7 mA

•Make certain that the maximum permissible current rating of the connection termi-

nals will not be exceeded

•Do not feed external mains voltage to the control outputs of the unit. When testing

the devices controlled by the burner control (fuel valves, etc.), the LME… must not

be connected

•In the case of burners with no fan motor, an AGK25 must be connected to terminal

3 of the unit, or else the burner cannot reliably be started up

•For safety reasons, feed the neutral conductor to terminal 2. Connect the burner

components (fan, ignition transformer and gas valves) to the neutral distributor as

shown below in figure 7101a05. The connection between neutral conductor and

terminal 2 is prewired in the base

Example

745

BV2

BV1

N7101a05/0804

Wiring of neutral conductors!

Electrical connection of flame detectors

It is important to achieve practically disturbance- and loss-free signal transmission:

•Never run detector cables together with other cables

– Line capacitance reduces the magnitude of the flame signal

– Use a separate cable

•Observe the permissible length of the detector cables (refer to «Technical data»)

•The ionization probe is not protected against electric shock hazard

•Locate the high-voltage ignition electrode and the ionization probe such that the

ignition spark cannot arc over to the ionization probe (risk of electrical overloads)

and that it cannot adversely affect the supervision of ionization

•Insulation resistance

– Must be a minimum of 50 MΩbetween ionization probe and ground

– Soiled detector holders reduce the insulation resistance, thus supporting cree-

page currents

•Earth the burner in compliance with the relevant regulations; earthing the boiler

alone does not suffice

Legend

BV... Fuel valve

M Fan motor

Z Ignition transformer

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Commissioning notes

•When commissioning the plant for the first time or when doing maintenance work,

make the following safety checks:

Safety check to be carried out Anticipated response

a) Burner startup with previously inter-

rupted line to the flame detector LME11…:

Max. 3 repetitions

LME2…:

Lockout at the end of «TSA»

b) Burner operation with simulated loss of

flame. For that purpose, cut off the gas

supply

LME11…:

•Establishment of flame at the

end of «TSA» →Max. 3 repeti-

tions

•No establishment of flame at

the end of «TSA» →Lockout

LME2…:

Lockout

c) Burner operation with simulated air

pressure failure (not with atmospheric

burners)

Immediate lockout

Standards and certificates

Conformity to EEC directives

- Electromagnetic compatibility EMC (immunity)

- Directive for gas-fired appliances

89 / 336 / EEC

90 / 396 / EEC

ISO 9001: 2000

Cert. 00739 ISO 14001: 2004

Cert. 38233

Identification code to EN 298

LME11… F M C L X N

LME21… / LME22… / LME23… F T L L X N

LME44… A M L L X N

Service notes

•Use the KF8872 service adapter for short periods of time only

Disposal notes The unit contains electrical and electronic components and must not be disposed of

together with domestic waste.

Local and currently valid legislation must be observed.

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Mechanical design

•Units of plug-in design like their predecessor types LGB... and LMG... (refer to

«Dimensions»)

•The housing is made of impact-proof, heat-resistant and flame-retarding plastic. It

is of plug-in design and engages audibly in the base

•The housing accommodates the

- microcontroller for the control sequence and the control relays for load control

- electronic flame signal amplifier (ionization)

- lockout reset button with its integrated 3-color signal lamp (LED) for operational

status and fault status messages and the socket for connecting the OCI400 inter-

face adapter

•Multicolor indication for operational status and fault status messages

•Transmission of operational status and fault status messages and detailed service

information via additional OCI400 interface adapter and ACS400 / ACS410 PC

Windows software

•Burner capacity unlimited (thermal output on startup ≤120 kW)

•3 repetitions in the event of loss of flame during operation (LME11…)

LME...

Indication and

diagnostics

Versions

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Type summary (other types of burner controls on request)

The type references given below apply to the LME… burner control without plug-in

base and without flame detector. For ordering information on plug-in bases and other

accessories, refer to «Ordering».

Flame detector Type

reference Main

voltage

approx.

min.

TSA

max.

t3n

approx.

t22

approx.

s 2)

t10

min.

s 3)

t11

min.

s 1)

t12

min.

s 1)

For

replacing of

Burner controls for 1-stage burners without communication (up to 120 kW output)

Ionization probe

(ION) LME11.330A2 AC230V 2.5 30 3 2 2 --- --- 5 --- ---

Burner controls for 2-stage burners without communication, without actuator control

LME21.130A1 AC 120 V 2.5 7 3 2 2 8 --- 5 --- ---

LGB21.130A27

LME21.130A2 AC 230 V 2.5 7 3 2 2 8 --- 5 --- ---

LGB21.130A27

LMG21.130A27

LME21.230A2 AC 230 V 2.5 20 3 2 2 8 --- 5 --- ---

LGB21.230A27

LMG21.230A27

LME21.330A1 AC 120 V 2.5 30 3 2 2 8 --- 5 --- ---

LME21.330A2 AC 230 V 2.5 30 3 2 2 8 --- 5 --- ---

LGB21.330A27

LMG21.330A27

LME21.350A1 AC 120 V 2.5 30 5 4 2 10 --- 5 --- ---

LGB21.350A17

LME21.350A2 AC 230 V 2.5 30 5 4 2 10 --- 5 --- ---

LGB21.350A27

LMG21.350A27

Ionization probe

(ION) or flame

detector QRA...

with AGQ3...

LME21.550A2 AC 230 V 2.5 50 5 4 2 10 --- 5 --- ---

LGB21.550A27

LMG22.550B27

Burner controls for 2-stage burners without communication, with actuator control

LME22.131A2 AC 230 V 2.5 7 3 2 3 8 --- 3 12 12

LGB22.130A27

LMG22.130A27

LME22.232A2 AC 230 V 2.5 20 3 2 3 8 --- 3 16.5 16.5

LGB22.230A27

LMG22.230A27

LME22.233A2 AC 230 V 2.5 20 3 2 3 8 --- 3 30 30 LMG22.233A27

LME22.331A1 AC 120 V 2.5 30 3 2 3 8 --- 3 12 12

---

Ionization probe

(ION) or flame

detector

QRA... 4) with

AGQ3...

LME22.331A2 AC 230 V 2.5 30 3 2 3 8 --- 3 12 12

LGB22.330A27

Burner controls for 2-stage burners

LME23.331A2 AC 230 V 2.5 30 3 2 3 8 --- 3 12 12 LGB32.330A27

Blue flame

detector QRC… LME23.351A2 AC 230 V 2.5 30 5 4 1 10 --- 3 12 12

LGB32.350A27

Legend

tw Waiting time 1) Max. running time available for actuator «SA»

TSA Safety time The actuator running time must be shorter

t1 Prepurge time 2) t22 + response time of flame relay

t3 Preignition time 3) Max. 65 s

t3n Postignition time 4) Only used for AC 230 V

t4 Interval between ignition «Off» and «BV2»

t10 Specified time for air pressure signal

t11 Programmed opening time for actuator «SA»

t12 Programmed closing time for actuator «SA»

t22 2nd safety time

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HVAC Products 29.06.2006

Type summary (other types of burner controls on request) [cont´d]

Flame detector Type

reference Main

voltage

min.

t1´

min.

TSA

max.

t3n

approx.

t22

approx.

t10

min.

s 2)

t11

min.

s 1)

t12

min.

s 1)

For

replacing of

Burner controls for atmospheric burners

LME44.056A2 AC 230 V 16 9 5 4 2 10 5 --- --- --- LGB41.255A27

LME44.057A1 AC 120 V 16 9 5 4 2 10 8 --- --- --- LGB41.258A17

Ionization probe

(ION) or flame

detector QRA... 4)

with AGQ3... LME44.057A2 AC 230 V 16 9 5 4 2 10 8 --- --- --- LGB41.258A27

Legend

tw Waiting time 1) Max. running time available for actuator «SA»

TSA Safety time The actuator running time must be shorter

t1´ Purge time 2) t22 + response time of flame relay

t3 Preignition time 3) Max. 65 s

t3n Postignition time 4) Only used for AC 230 V

t4 Interval between ignition «Off» and «BV2»

t10 Specified time for air pressure signal

t11 Programmed opening time for actuator «SA»

t12 Programmed closing time for actuator «SA»

t22 2nd safety time

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Ordering

Gas burner control, without plug-in base refer to «Type summary»

Connection accessories for small burner controls refer to Data Sheet N7201

- Plug-in base AGK11...

- Cable holders AGK65..., AGK66, AGK67...

- Cable strain relief elements for AGK67...

Connection accessories for small burner controls refer to Data Sheet N7203

- Plug-in base AGK13...

- Plug-in housing AGK56…

- Accessories AGK68…

Flame detectors

- Ionization probe supplied by thirds

- Flame detector QRA2... or QRA10... refer to Data Sheet N7712

- Blue-flame detector QRC1... refer to Data Sheet N7716

Diagnostics tool refer to Data Sheet N7614

- Interface adapter OCI400

- PC Windows software ACS400

Actuators SQN3... refer to Data Sheet N7808

Actuators SQN7... refer to Data Sheet N7804

Actuators SQN9... refer to Data Sheet N7806

RC unit ARC 4 668 9066 0

For the supervision of ionization currents in networks with nonearthed neutral conductor

PTC resistor (AC 230 V)

GK25

For producing a burden on terminal 3 (on burners with no fan motor, e.g. atmospheric

gas burners)

Ancillary unit for UV supervision

- Cable length 500 mm AGQ3.1A27

- Cable length 300 mm AGQ3.2A27

Can be fitted under the plug-in base (for size, refer to «Dimensions»)

Service adapter KF8872

- For checking the functioning of the burner controls on the burner plant

- Functional test with signal lamps

Note: With no load on the output terminals, the relevant signal lamp may light up.

- Detector resistance measurement with a jack of 4 mm diameter

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Technical data Mains voltage AC 120 V +10 % / -15 %

AC 230 V +10 % / -15 %

Mains frequency 50...60 Hz ±6 %

Power consumption 12 VA

External primary fuse (Si) max. 10 A (slow)

Mounting position optional

Input current at terminal 12 max. 5 A

Weight approx. 160 g

Safety class I

Degree of protection IP 40 (to be ensured through mounting)

Perm. cable length terminal 1 max. 1 m at a line capacitance of 100 pF/m

(max. 3 m at 15 pF / m)

Perm. cable length from QRA… to

AGQ3…A27 (lay separate cable) max. 20 m at 100 pF / m

Remote reset laid separately max. 20 m at 100 pF / m

Perm. cable length terminals 8 and 10 max. 20 m at 100 pF / m

Perm. cable lengths other terminals max. 3 m at 100 pF / m

Current rating At cosϕ≥0.6 At cosϕ= 1

- Terminal 3 Max. 2.7 A

(15 A for max. 0.5 s →only LME2…) Max. 3 A

- Terminals 4, 5, 7 and 9 (11) Max. 1.7 A Max. 2 A

- Terminal 10 Max. 1 A Max. 1 A

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 60 721-3-2

Climatic conditions class 2K2

Mechanical conditions class 2M2

Temperature range -20...+60 °C

Humidity < 95 % r.h.

Operation DIN EN 60 721-3-3

Climatic conditions class 3K3

Mechanical conditions class 3M3

Temperature range -20...+60 °C

Humidity < 95 % r.h.

Condensation, formation of ice and ingress of water are not permitted!

General unit data

Environmental

conditions

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Technical data (cont´d)

At mains voltage

UN = AC 230 V ¹)

Detector voltage between ionization probe and ground

(AC voltmeter Ri ≥10 MΩ) AC 115...240 V

Switching threshold (limit values):

Switching on (flame on) (DC ammeter Ri ≤5 kΩ)

Switching off (flame off) (DC ammeter Ri ≤5 kΩ)

≥DC 1.5 µA

≤DC 0.5 µA

Detector current required for reliable operation ≥DC 3 µA

Switching threshold in the event of poor flame during operation

(LED flashes green) Approx. DC 5 µA

Short-circuit current between ionization probe and ground

(AC ammeter Ri ≤5 kΩ) Max. AC 100...300 µA

¹) For applications outside the European Community, operation at mains voltage AC 230 V ±10 % is

ensured

With the same quality of flame, the detector current with the LME… may be an-

other than that with the LMG… / LGB…

Flame supervision with ionization is accomplished by making use of the conductivity

and rectifying effect of the flame. The flame signal amplifier only responds to the DC

current component of the flame signal. A short-circuit between ionization probe and

ground causes the burner to initiate lockout.

LME... 1

7101v01/0804

ION

Legend

C Electrolytic capacitor 100...470 µF; DC 10...25 V

ION Ionization probe

M Microammeter, Ri max. 5000 Ω

For detector currents, refer to « Technical data ».

Flame supervision

with ionization probe

Note

Measuring circuit

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