Siemens LFE1 Series User manual

CC1N7461en

21.08.2018

Building T

echnologies

461

Burner Controls LFE1...

The LFE1... burner control is designed for use with forced draft gas and dual-fuel

burners of any capacity, in intermittent operation.

The LFE1... and this Data Sheet are intended for use by OEMs which integrate the

burner controls in their products.

Use The LFE1... is designed for the fully automatic control and supervision of single-stage,

multi-stage or modulating gas or dual-fuel burners. It is suited for use with expanding

flame and interrupted pilot type gas burners. Flame supervision is ensured by means of

an ionization probe or a QRA... UV flame detector. Ignition spark proving with a UV

flame detector is also possible. When used in connection with a gas valve proving

system LDU11... (refer to Data Sheet N7696), the control sequence of the LFE1… can

be extended to include automatic gas valve proving. All types of burner controls comply

with the relevant European standards for gas and oil burners of any capacity.

The LFE1... can control the following burner plant components:

fan motor, flue gas fan, air damper, ignition transformer, 1 to 3 fuel valves, load

controller and an external lockout warning device.

·Applications in accordance with EN 676: Automatic forced draft burners for liquid

fuels

·Type-tested in accordance with EN 298: 2004

CNote!

Do not use for new designs.

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Use (cont´d)

·Prepurge time adjustable between 8 and 63 seconds

·Operation optional with or without postpurging

·Fully automatic control of the air damper, irrespective of the actuator running time

·The air pressure check can be combined with the functional check of the air

pressure switch prior to startup

·Ignition optional: direct ignition, with pilot burner, without or with ignition spark

proving

·First and second safety time adjustable between 0 and 9 seconds

·Automatic test of the UV flame detector during burner off periods and during the

purging times

·Optional semi-automatic start and operation

·Built-in lockout warning lamp

·The program indicator shows continuously the program sequence

·The motor of the sequence switch can be switched off (to simplify burner

adjustments)

·The camshaft of the sequence switch can be turned manually

·Optional electrical remote lockout reset

Warning notes

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

warning notes must be observed!

The unit may only be opened, interfered with or modified by qualified staff!

·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 burner control,

completely isolate the burner control from the mains supply (all-polar

disconnection). Ensure that the plant cannot be inadvertently switched on again

and that it is indeed dead. If not disconnected, there is a risk of electric shock

hazard

·Ensure protection against electric shock hazard by providing adequate protection

for the 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»

·Press the lockout reset button / operation button extension 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 or the remote lockout reset button

for more than 10 seconds since this damages the lockout relay in the unit

·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

·Sealing screws may only be loosened and factory settings may only be changed by

authorized staff

Mounting notes

Ensure that the relevant national safety regulations are complied with.

Special features

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Installation notes

·Always run the high ignition cables separate from the unit and other cables while

observing the greatest possible distance

·Install switches, fuses and earthing in compliance with local regulations

·Make certain that the maximum permissible current rating of the connection

terminals will not be exceeded

·Observe the polarity

Burner controls LFE1... are able to detect wrong polarity of live and neutral

conductors, in which case they initiate lockout at the end of «TSA»

Electrical connection of flame detectors

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

·Never run the detector cable 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 does not offer protection against electric shock hazard

·Locate the 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 MWbetween ionization probe and ground

– Soiled detector holders reduce the insulation resistance, thus supporting

creepage currents

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

alone does not suffice

Commissioning notes

·For setting notes, refer to «Setting facilities on the burner control»

·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 flame detector darkened Lockout at the end of safety

time (TSA)

b) Burner startup with flame detector exposed

to extraneous light Delayed lockout

c) Burner operation with simulated loss of

flame; for that purpose, darken the flame

detector during operation and maintain that

status

Lockout

d) Burner startup without air pressure signal Lockout during the prepurge

time

e) Burner operation with simulated air pressure

failure Immediate lockout

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Standards and certificates

Applied directives:

·Low-voltage directive 2014/35/EU

·Electromagnetic compatibility EMC (immunity) *) 2014/30/EU

*) The compliance with EMC emission requirements must be checked after the burner control is

installed in equipment

Note!

These devices may only be used as replacements within the EU and EFTA countries.

Compliance with the regulations of the earlier, now withdrawn directives is verified by

the adherence to the following standards:

·Automatic burner control systems for oil burners DIN EN 230:2005

·Automatic burner control systems for burners and

appliances burning gaseous or liquid fuels DIN EN 298:2004

·Automatic electrical controls for household and similar

use

Part 2-5:

Particular requirements for automatic electrical burner

control systems

DIN EN 60730-2-5:2005

EAC Conformity mark (Eurasian Conformity mark)

ISO 9001:2015

ISO 14001:2015

OHSAS 18001:2007

China RoHS

Hazardous substances table:

http://www.siemens.com/download?A6V10883536

Lifecycle

Burner controls has a designed lifetime* of 250,000 burner startup cycles which, under

normal operating conditions in heating mode, correspond to 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 EN 230 / EN 298.

A summary of the conditions has been published by the European Control

Manufacturers Association (Afecor) (www.afecor.org).

The designed lifetime is based on use of the burner controls 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 BMU 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 electrical and electronic components and must not be disposed of

together with household garbage.

Local and currently valid legislation must be observed.

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Mechanical design

·Plug-in design

·The built-in unit fuse protects the control contacts of burner control against

overloads

·Impact-proof plastic housing

·Able for optional mounting position at burner, on control panes or in control

cabinets

·Control unit driven by synchronous motor, the auxiliary relays, the electronic flame

signal amplifier as soon as all the rest of switch, control and adjustable elements

are build-on at stable PCBs and included in test circuit of burner control

·The burner control is secured to its base with 4 screws. The unit cover is protected

against tampering by means of 2 sealing screws (refer to «Dimensions»)

·Printed circuit board with electronic components

·Large connection area

·Made of black, impact-proof and heat-resistant plastic

·Lockout reset button with viewing window, for the lockout warning lamp

·Transparent viewing window for the program sequence indicator

- coupled to the program shaft

- uses easy-to-remember symbols to indicate the type of fault and the point in

time lockout occurred

·4 extra terminals for the earth conductor, 4 extra terminals for the neutral

conductor, and 4 auxiliary terminals

LFE1...

Housing

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Type summary

Article no.

*Type

*Mains voltage Factory settings for

mains

frequency t1 TSA t9

BPZ:LFE1.1 / 8854 LFE1.1 / 8854 AC 220...240 V 50 Hz

15 s

2 s 2 s

BPZ:LFE1 / 8851 LFE1 / 8851 60 s

BPZ:LFE1 / 8853 LFE1 / 8853

30 s

BPZ:LFE1 / 8866 LFE1 / 8866 AC 100...110 V

BPZ:LFE1 / 8867 LFE1 / 8867 60 Hz

BPZ:LFE1 / 8868 LFE1 / 8868 AC 220...240 V

BPZ:LFE1 / 8892 LFE1 / 8892 50 Hz 60 s 5 s 5 s

* The marking is given inside housing in the range of the contacts

Accessories (must be ordered separately)

Flame detectors Photocell detectors RAR9...

See Data Sheet N7713

UV flame detectors QRA2...

See Data Sheet N7712

UV flame detectors QRA10...

See Data Sheet N7712

UV flame detectors QRA4...

See Data Sheet N7711

Ionization probe

Supplied by thirds

Plug-in base Plug-in base AGG41041713 (FE)

Article no.: BPZ:AGG41041713(FE)

With Pg11 thread for cable entry glands

Plug-in base AGG13.1

Article no.: BPZ:AGG13.1

With M16 thread for cable entry glands

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Technical data Mains frequency AC 220 V -15 %...AC 240 V +10 %

AC 100 V -15 %...AC 110 V +10 %

Mains frequency 50...60 Hz ±6 %

Unit fuse (built-in) T6,3H250V to DIN EN 60127,

(5 x 20 mm)

Primary fuse (external) Max. 16 A (slow)

Weight approx. 2 kg

Power consumption

-in startup

in operation Approx. 9 VA

Approx. 6 VA

Mounting position optional

Degree of protection IP40, when built in, with the exception of

the connection area (terminal base)

Safety class II

Perm. loading of control outputs

-Per terminal

Total Max. 4 A to VDE 0660 AC3

Max. 5 A to VDE 0660 AC3

Storage DIN EN 60 721-3-1

Climatic conditions class 1K3

Mechanical conditions class 1M2

Temperature range -20...+60 °C

Humidity < 95 % r.F.

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.

Installation altitude Max. 2,000 m above sea level

Attention!

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

If not observed, the safety functions are no longer ensured and there will be a

risk of electric shock.

Ionization probe QRA...

Operating voltage 460 Vpeak 460 Vpeak

Required detector current

-At AC 100 V and AC 220 V

At AC 110 V and AC 240 V Min. 8 µA

Min. 9 µA Min. 150 µA

Min. 200 µA

Possible detector current Max. 100 µA Max. 650 µA

Short-circuit current Approx. 4 mA ---

Perm. length of connection cable

(laid separately) 20 m ¹) 20 m ¹)

Perm. ambient temperature --- 60 °C

Type of insulation --- Protective insulation

Mounting position --- Optional

1) If longer distances need to be covered, use low capacitance cable (e.g. single-core cable,

totally max. 2 nF)

General unit data

LFE1...

Environmental

conditions

Flame supervision

Flame detector

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Technical data (cont´d) There is no self-checking while measurements are made.

Ionization probe Flame detector QRA...

LFE1... 14

ION

QRA...

For detector currents, refer to «Technical data».

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

ION Ionization probe

M Microammeter Ri max. 5000 W

Detector current

measurement

Legend

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Function The burner can be started only when:

-the burner control’s sequence switch is in its start position

-the burner control has not locked out, e.g. caused by a defective UV tube

-the contacts of all control and safety devices in the control loop between terminals

8 and 9 are closed

-the air pressure switch does not indicate air pressure

Defects in the flame supervision circuit or in the burner control itself prevent startup or

lead to lockout during the startup sequence.

Attention!

If the air damper is not controlled by the burner control, terminals 20, 21 and 22

must be interconnected.

First, the fan motor is activated via terminal 3, and the actuator is controlled via terminal

22.

As soon as the air damper reaches its fully open position, the burner control’s

sequence switch starts running and the prepurge time commences.

The minimum air pressure set on the air pressure switch must be reached within 10

seconds (5 seconds with the LFE1.1) (or 7 seconds [3.5 seconds with the LFE1.1] with

postpurging) and must be maintained until controlled shutdown occurs. Otherwise, the

burner control will initiate lockout.

A flame signal during the prepurge time also leads to lockout.

On completion of the set prepurge time, the damper receives the control command to

return to the fully closed position.

The sequence switch remains stationary during the time the air damper travels to its

closed position.

As soon as the signal contact for minimum air is operated by the actuator, the

sequence switch starts running again and continues with the burner’s program

sequence, which can no longer be influenced from externally:

·Preignition (3 seconds / 1.5 seconds with the LFE1.1)

·Release of the first fuel value at terminal 5 (the fuel valve of a pilot burner, which

must be shut on completion of the second safety time, must be connected to

terminal 10)

·Completion of the set safety time. If no flame is established during that period of

time, lockout will occur (always with interlocking of the burner control)

·Following an interval of 11 seconds (5.5 seconds with the LFE1.1) of the first fuel

valve, the second fuel valve will be released

·The pilot burner, if connected to terminal 10, will be shut

·The load controller will be switched on following a further interval of 12 seconds (6

seconds with the LFE1.1). The burner’s operating position has thus been reached.

From now on, the load controller controls the burner’s output by increasing or

decreasing the fuel throughput and the air flow in response to the heat demand

(ratio control). This can be accomplished either in a stepwise fashion, e.g. with a

thermostat, or continuously by means of a modulating controller

Loss of flame during operation always leads to lockout.

In principle, the program sequence is the same as startup without ignition spark

supervision.

Exceptions:

·If the UV flame detector does not receive an input signal during the preignition

time, lockout will occur before any gas is released, that is, safety time TSA = 0

seconds

·With ignition spark supervision, the safety time for the pilot burner can only be

adjusted between 0...6 seconds (= TSA‘ in the sequence diagram of the sequence

switch)

Prerequisites for

burner startup

Program sequence

on startup

Startup with ignition

spark supervision

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Function (cont´d) Controlled shutdown takes place as soon as one of the control or monitoring devices in

the control loop between terminals 8 and 9 opens its contacts.

As a result, the fuel valves are immediately shut and the sequence switch is restarted

to program postpurging, if scheduled.

On completion of the postpurge time, the sequence switch has reached its start position

again, which is maintained until the next switch-on command is given.

During the postpurge time, flame supervision is started again. Hence, any flame signal

that occurs during that period of time will lead to lockout.

After pressing the built-in or remote lockout reset button, the sequence switch will

return to its start position.

In that case, the only burner plant component that is switched on is the fan motor

connected to terminal 17.

Since in normal circumstances the control thermostat or pressurestat continues to call

for heat, the burner control immediately triggers a new start when the start position is

reached.

Program indicator The program indicator continuously indicates the progress of the startup sequence.

The letters on the indicator disk correspond to those in the adjacent sequence switch

diagram. The numbers give the remaining prepurge time.

In the event of lockout, both sequence switch and program indicator stop, showing the

phase of operation during which lockout occurred.

¬Prepurge time lasts another 35

seconds

Valve 2 at terminal 7 opens ®

Control sequence

following a controlled

shutdown

Control sequence

following lockout reset

of the burner control

Reading the program

indicator

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