Siemens LFE1 Series User manual

CC1N7461en
21.08.2018
Building T
echnologies
7
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
C
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
M
C
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.
40
30
¬Prepurge time lasts another 35
seconds
Valve 2 at terminal 7 opens ®
D
F
E
Control sequence
following a controlled
shutdown
Control sequence
following lockout reset
of the burner control
Reading the program
indicator