Siemens LGB21.130A17 User manual

CC1N7435en

11.01.2007

Building Technologies

HVAC Products

7435

Burner Controls LGB...

Burner controls for the supervision of 1- or 2-stage gas or gas / oil burners of

small to medium capacity (typically up to 350 kW), with or without fan, in intermit-

tent operation.

The LGB... and this Data Sheet are intended for use by OEMs which integrate the

burner controls in their products!

Use The LGB... burner controls are used for the startup and supervision of 1- or 2-stage gas

or gas / oil burners in intermittent operation.

Depending on the type of burner control used, the flame is supervised either by an

ionization probe, a blue-flame detector QRC1... for forced draft gas / oil burners, or a

UV detector QRA... (with auxiliary unit AGQ1...A27).

In connection with the respective adapters, the LGB... burner controls replace their

predecessor types LFI7... and LFM1... (also refer to «Replacement types» under «Or-

dering»).

- Automatic forced draft burners for gaseous fuels to EN 676

- Gas burner controls to EN 298

- Undervoltage detection

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

startup and operation

- Electrical remote reset facility

- LGB41... for use with atmospheric gas burners

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Building Technologies CC1N7435en

HVAC Products 11.01.2007

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 performing any wiring changes in the connection area of the LGB..., com-

pletely 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

•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»

•Check to ensure that wiring is in an orderly state

•Press the lockout reset button only manually (apply 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

Mounting notes

•Ensure that the relevant national safety regulations are complied with

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

•Ensure that the maximum permissible current ratings will not be exceeded (refer to

«Technical data»)

•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 LGB... must not

be connected

•To isolate the burner control from the mains supply, use an all-polar switch with a

contact gap of at least 3 mm

•Secure the earthing lug in the base with a metric screw and a lockwasher

•In the case of burners with no fan, the AGK25 must be connected to terminal 3 as

a burden, or else the burner cannot reliably start

•For safety reasons, feed the neutral conductor to the neutral distributor in the plug-

in base, or to terminal 2. Connect the burner components (fan, ignition transformer

and gas valves) as represented in the figure 7435a14, to the neutral distributor as

shown below. The connection between neutral conductor and terminal 2 is pre-

wired in the base

Exam-

ple 23

745

N7435a14/0601

ZV1 V2

Legend

V... Fuel valve

M Fan motor

Z Ignition transformer

Correct wiring of neutral conductors!

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Building Technologies CC1N7435en

HVAC Products 11.01.2007

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 and the ignition electrode are 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

•With both ionization current and UV supervision, the cable length for flame detec-

tion must not exceed 20 m

•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

– Prerequisite is not only high-quality heat-resistant insulation of the probe’s

cable, but also of the ionization probe itself (ceramic holder)

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

alone does not suffice

•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

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 ionization probe and

flame detector darkened in the case of

QRA... or QRC1...

Lockout at the end of «TSA»

b) Burner operation with simulated loss of

flame. For that purpose, cut off the gas

supply (e.g. disconnect the fuel valve

while ensuring protection against elec-

tric shock hazard)

Immediate lockout

c) Burner operation with simulated air

pressure failure (not with atmospheric

burners)

Immediate lockout

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Building Technologies CC1N7435en

HVAC Products 11.01.2007

Standards and certificates

Conformity to EEC directives

- Electromagnetic compatibility EMC (immunity)

- Low-voltage directive

- Directive for gas appliances

89 / 336 / EEC

73 / 23 / EEC

90 / 396 / EEC

ISO 9001: 2000

Cert. 00739 ISO 14001: 2004

Cert. 38233

•Identification code to EN 298

- LGB21... / LGB22... F T L L X N with 2-stage operation

- LGB32... F M L L X N with 2-stage operation

- LGB41... A B L L X N with 2-stage operation

(«BV1 + BV2» or «ZBV + BV2») A M L L X N with 1-stage operation

LGB21.130A17 x x --- ---

LGB21.130A27 x x x x

LGB21.230A27 x x x ---

LGB21.330A27 x x x ---

LGB21.350A17 x x --- ---

LGB21.350A27 x x x x

LGB21.550A27 x x x x

LGB22.130A27 x x x x

LGB22.230B27 x x x ---

LGB22.330A17 x x --- ---

LGB22.330A27 x x x x

LGB22.330A270 x x x ---

LGB32.130A27 x x x x

LGB32.230A17 x x --- ---

LGB32.230A27 x x x ---

LGB32.330A17 x x x ---

LGB32.330A27 x x x ---

LGB32.350A17 x x x ---

LGB32.350A27 x x x x

LGB41.255A27 x x --- x

LGB41.258A17 x x --- ---

LGB41.258A27 x x --- x

Service notes

•Use 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 household waste.

Local and currently valid legislation must be observed.

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Building Technologies CC1N7435en

HVAC Products 11.01.2007

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

It is of plug-in design (measuring 91 x 62 x 63 mm, including the base) and engages

audibly in the base.

The housing accommodates the

- programming mechanism with the synchronous motor

- electronic flame signal amplifier (ionization) with the flame relay and the other

switching devices

- lockout reset button with its integrated fault indication lamp

Type summary The type references given below apply to LGB... burner controls without plug-in base

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

sories, refer to «Mechanical design», «Ordering», «Flame supervision ...» and «Tech-

nical data».

Flame detector Type reference Approved in: tw/s t1/s TSA/s t3n/s t3/s t4/s t9/s t10/s t11/s t12/s t20/s

6) 3) 3)

ca. min. max. ca. ca. ca. max. min. max. max. ca.

Burner controls for 2-stage burners without control of actuator

Ionization probe (ION) LGB21.130A27 4)7) CH, EU, S, SF 8 7 3 2.4 2 8 --- 5 --- --- 6

LGB21.230A27 5) CH, EU, S, SF 8 15 3 2.4 2 8 --- 5 --- --- 38or UV detector QRA...

with AGQ1...A27 LGB21.330A27 5) CH, EU, H, S, SF 8 30 3 2.4 2 8 --- 5 --- --- 23

LGB21.350A27 5)7) CH, EU, H, S, SF 8 30 5 4 2 10 --- 5 --- --- 21

LGB21.550A27 5) AUS, CH, EU 8 50 5 4 2 10 --- 5 --- --- 2

Burner controls for 2-stage burners with control of actuator

Ionization probe (ION) LGB22.130A27 4) CH, EU, N, S 9 7 3 2.4 3 8 --- 4 12 12 21

or UV detector QRA... LGB22.230B27 5) CH, EU, N, S, SF 9 20 3 2.4 3 8 --- 4 16.5 16.5 2

with AGQ1...A27 LGB22.330A27 5)7) AUS, CH, EU, H, N, S, SF 9 30 3 2.4 3 8 --- 4 12 11 2

LGB22.330A270 5)8) EU 9 30 3 2.4 3 8 --- 4 12 11 2

Blue-flame detector LGB32.130A27 4)1) CH, EU 9 7 3 2.4 3 8 --- 4 12 12 21

QRC1... LGB32.230A27 5)1) CH, EU 9 20 3 2.4 3 8 --- 4 12 12 2

LGB32.330A27 5) CH, EU 9 30 3 2.4 3 8 --- 4 12 11 2

LGB32.350A27 5) CH, EU 9 30 5 4.4 1 10 --- 4 12 9 2

Burner controls for atmospheric burners

Ionization probe (ION) LGB41.255A27 EU 18 --- 5 4 2 10 5 --- --- --- 10

or UV detector QRA...

with AGQ1...A27 LGB41.258A27 2)5)7) CH, EU, H, SF 18 --- 5 4 2 10 8 --- --- --- 10

Legend tw Waiting time 1) On request

t1 Prepurge time 2) For atmospheric burners up to 120 kW

TSA Ignition safety time 3) Maximum running time available for actuator

t3 Preignition time 4) Also suited for flash steam generators

t3n Postignition time 5) Also suited for stationary direct-fired air heaters

t4 Interval «BV1-BV2» or «BV1-LR» 6) «t9» + reaction time of flame relay

t9 Second safety time 7) Also available for AC 100...110 V; in that case, the last 2

t10 Specified time for air pressure signal digits read ...17 in place of ...27

t11 Programmed opening time for actuator «SA» 8) Without internal microfuse; must only be used in connection

t12 Programmed closing time for actuator «SA» with external microfuse 6.3 A (slow)!

t20 Interval up to self-shutdown of programming mechanism

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Building Technologies CC1N7435en

HVAC Products 11.01.2007

Ordering

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

- UV- flame detectors QRA2... / QRA10... refer to Data Sheet N7712

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

RC unit ARC 4 668 9066 0

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

PTC resistor (AC 230 V) AGK25

To burden terminal 3 (mandatory when using burners with no fan

motor connected to terminal 3)

Auxiliary unit for UV supervision

- Cable length 500 mm AGQ1.1A27

- Cable length 300 mm AGQ1.2A27

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

Pedestal (empty housing) AGK21

- For increasing the height of the LGB... to that of the LFM... or LFI7...

Service adapter KF8872

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

- Functional test with signal lamps

- Detector resistance measurement with a jack of 4 mm diameter

Adapters / replacement types

No rewiring required KF8852

LFI7...

LGB21... with adapter

KF8880

LFM1... ¹)

LFM1...-F ¹)

KF8853-K

LFI7...

LGB22... with adapter

KF8880

LFM1... ¹)

LGB41... with adapter KF8862

LFM1... ¹)

¹) Designed only for ionization

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Building Technologies CC1N7435en

HVAC Products 11.01.2007

Technical data Mains voltage AC 220 V –15 % ...AC 240 V +10 %

(LGB2... / LGB4...)

AC 230 V –15 % / +10 % (LGB32...!)

AC 100 V –15 % ...AC 110 V +10 %

Mains frequency 50...60 Hz ±6 %

Input current at terminal 12 max. 5 A

within the permissible voltage range

AC 187...264 V or AC 195...253 V

Current rating

- Terminal 3

- Terminals 4, 5 and 7

- Terminals 9 and 10

- Terminal 12

max. 3 A (15 A for max. 0.5 s)

max. 2 A

max. 1 A

max. 5 A

(at Umax. AC 264 V or AC 253 V)

Cable length terminals 8 and 10 20 m at 100 pF / m

Perm. cable lengths

Detector cable laid separately max. 3 m at 100 pF / m line capacitance

20 m

Power consumption 3 VA

Primary fuse max. 10 A (slow)

Degree of protection IP 40, when built in, with the exception of

the connection area (terminal base)

Mounting position optional

Weight approx. 230 g

Storage DIN EN 60 721-3-1

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 2K3

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 3M2

Temperature range -20...+60 °C

Humidity < 95 % r.h.

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

General unit data

LGB...

Environmental conditions

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Building Technologies CC1N7435en

HVAC Products 11.01.2007

Flame supervision

At mains voltage UN= AC 230 V

Detector voltage across terminals 1 and

2 or ground (AC voltmeter Ri ≥10 MΩ)

≤UN

Detector current required for reliable operation min. 3 µA

Possible detector current in operation max. 100 µA

The conductivity and rectifying effect of hot flame gases are used for flame supervision.

For that purpose, AC voltage is applied to the heat-resistant ionization probe which

projects into the flame. The current that flows in the presence of a flame (ionization

current) produces the flame signal which is fed to the input of the flame signal amplifier.

The amplifier is designed such that it only responds to the DC current component of the

flame signal, thereby ensuring that a short-circuit between ionization probe and ground

cannot simulate a flame signal (since in that case AC current would flow).

Basically, the flame supervision circuit is insensitive to adverse effects of the ignition

spark.

However, should the disturbing effects of the ignition spark on the ionization current

exceed a certain level, the electrical connections on the primary side of the ignition

transformer must be changed and / or the location of the ionization probe must be

checked.

Since the ionization current with burner controls operating on AC 110 V is only about

50 % of those operating on AC 230 V, certain applications make it necessary to in-

crease the ionization current with a transformer.

Capacity of transformer: Min. 2 VA

Transforming ratio: Approx. 1.1...1.5

The primary and secondary windings of the transformer must be galvanically sepa-

rated.

AC 115 V

LGB2...

12 2

1AC 115...230 V

7435v01/0504

ION

Flame supervision with

ionization probe

Ionization current su-

pervision with burner

controls operating on

C 110 V

Connection of

transformer

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Building Technologies CC1N7435en

HVAC Products 11.01.2007

Perm. detector current during the prepurge

time (dark current) max. 5 µA

Detector current required during

operation min. 50 µA

Possible detector current in operation max. 80 µA

Measuring circuit with the QRC1...

112 2

LGB3...

7435v02/0601

QRC1

Legend

M Microammeter Ri max. 5000 Ω

sw Black wire

br Brown wire

bl Blue wire

The QRC1... has been designed specifically for blue-burning flames. Incidence of light

is from the front and laterally. The flame detector is secured by means of a soft plastic

plug. 3-core connection (preamplifier integrated in the detector casing). For the different

types of flame detectors, engineering notes and technical data, refer to Data Sheet

N7716.

Mains voltage AC 220 V –15 %...AC 240 V +10 %

Mains frequency 50...60 Hz ±6 %

Power consumption 4.5 VA

Degree of protection IP 40

Perm. ambient temperature

- In operation

- During transport and storage

-20...+60 °C

-40...+70 °C

Perm. length of cable from QRA... to

AGQ1...A27 (use separate cable) max. 20 m

Mounting position optional

Perm. length of connecting cable from

AGQ1...A27 to LGB... max. 20 m

Weight of AGQ1...A27 approx. 140 g

At mains voltage UN:

AC 220 V AC 240 V

Detector voltage at QRA... (with no load)

Up to the end of «t10» and after controlled shutdown DC 400 V DC 400 V

From the beginning of «t1» DC 300 V DC 300 V

Detector voltage

Load by DC measuring instrument Ri > 10 MΩ

Up to the end of «t10» and after controlled shutdown DC 380 V DC 380 V

From the beginning of «t1» DC 280 V DC 280 V

DC detector signals with UV detector QRA... Min. required Max. possible

Measurement on the QRA... 200 µA 500 µA

Flame supervision with

blue-flame detector

QRC1...

Flame supervision with

UV detector QRA... and

GQ... for LGB21... /

LGB22... / LGB41...

10/22

Building Technologies CC1N7435en

HVAC Products 11.01.2007

Flame supervision with UV detector QRA... and auxiliary unit AGQ... for LGB21... / LGB22... / LGB41...

Universal flame detector for use with gas and gas / oil burners. Incidence of light from

the front and laterally, total length 97 mm. Available with normal or, as QRA2M, with

higher sensitivity. Secured with flange and clamp. Also available as a metal encapsu-

lated version in the form of the QRA10... (for details, refer to Data Sheet N7712).

A special UV auxiliary unit AGQ1...A27 is required in connection with LGB... burner

controls.

That unit is to be connected to the mains supply via 2 cables, and to the burner control

via terminals 1, 2 and 11.

Using circuitry (A) or (B), there are 2 ways to make the quench test on aging UV detec-

tors and to detect UV light:

1. (A) Operation with a permanent line:

UV test at a higher supply voltage across the UV cell on startup and after con-

trolled shutdown.

2. (B) Operation with a controlled line:

UV test at a higher supply voltage only on startup, that is, during the interval

between controlled startup and air pressure signal.

– No voltage at the UV cell after controlled shutdown

– No full substitute for mode (A) above, since an aged UV cell can regenerate

itself

Measuring circuit Connection diagram

12 211

7435a19/0301

br bl rt sw AGQ1...A27

sw bl

(B)

LGB...

QRA

12 211

7435a15/0704

GP/SB

R/W

QRA +

br bl rt sw AGQ1...A27

sw bl

(B)

(A)

LGB...

Measurement made on the flame detector

GP Gas pressure switch

R Temperature or pressure controller

SB Safety limit thermostat

W Limit thermostat or pressure switch

* With LGB41...: Terminal 3

(A) Operation with permanent line

(B) Operation with controlled line

UV detector QRA...

uxiliary unit

GQ1...A27

Legend

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