Siemens LAL Series User Manual

CC1N7153en
21.09.2016
Building Technologies Division
7
153
Oil Burner Controls
LAL...
Oil burner controls
 For oil atomizing burners of medium to large capacity
 For multistage or modulating burners in intermittent operation
 With or without air pressure supervision for checked air damper control
 Flame supervision
– with photoresistive detector QRB
– or blue-flame detector QRC1
– or silicon photocell detector RAR9
 Suitable for use with air heaters (WLE)
The LAL and this Data Sheet are intended for OEMs which integrate the oil
burner controls in their products!
Use
 For the control and supervision of oil atomization burners
 For burners of medium to high capacity
 For intermittent operation (at least one controlled shutdown every 24 hours)
 Can be universally used with multistage or modulating burners
 Suited for use with stationary air heaters (WLE)
The flame supervision is ensured via a Photoresistive detectors QRB，blue-flame
detectors QRC1 or Silicon photocell detectors RAR9.
LAL1 - Yellow- and blue-flame burners without air pressure supervision
LAL2 - Yellow-flame burners with air pressure supervision
LAL3.25 - For special applications, e.g. burners of incinerator plant
(for details, refer to «Type summary» and «Notes»)

Siemens LAL Series Specifications

General

Restart interlock	Yes
Category	Control Unit
Manufacturer	Siemens
Type	LAL
Series	LAL
Suitable burners	Gas burners
Frequency	50/60 Hz
Safety time	1…3 s

Summary

Use

Warning notes

Mounting notes

Installation notes

Electrical connection of the flame detector

Commissioning notes

Engineering notes

Standards and certificates

Life cycle

Disposal notes

Mechanical design

Housing

Details on the impact-proof and heat-resistance black plastic housing for the burner control.

Type summary

Legend of times

Accessories (to be ordered separately)

Flame detectors

Lists photoresistive, blue-flame, and silicon photocell flame detectors for burner controls.

Actuators

Details on the SQN3 actuator for burner control applications.

Accessories for medium-capacity burner controls

Information on plug-in bases (AGM410490500, AGM13.1) for burner controls.

Others

Specifies coaxial cable RG62, supplied by the customer.

Technical data

General unit data LAL

Provides general specifications for the LAL burner control unit, including voltage, frequency, and power.

Environmental conditions

Details operating, storage, and transport conditions, including temperature, humidity, and altitude.

Flame supervision

Detector current measurement

Function

2-stage expanding flame burner

Describes the function and sequence for 2-stage expanding flame burners.

Modulating expanding flame burner

Explains the operation and sequence for modulating expanding flame burners.

General

Highlights safety features of the LAL burner control, including flame supervision checks.

Control of the burner

Flame supervision

Preconditions for burner startup

With the exception of LAL1

Startup sequence

t1 Prepurge time with air damper fully open

Details the prepurge time phase where the air damper is fully open.

t3 Short preignition time

Describes the short preignition phase, including connection requirements.

t3' Long preignition time

Explains the long preignition phase with specific connection details for LAL1/LAL2/LAL3.

TSA Ignition safety time

Defines the ignition safety time and its requirement for flame presence.

t3n Postignition time

Covers the postignition time, including conditions for short preignition.

t4 Interval «BV1 – BV2» or «BV1 - LR»

Details the interval between fuel valve operations or fuel valve and load controller.

t5 Interval

Describes the interval after t5, where terminal 20 receives power and outputs are separated.

B-C Burner operation

Explains the burner operation phase, including air damper control and flame loss lockout.

C Controlled shutdown

Describes the controlled shutdown sequence, including valve closure and sequence switch start.

t6 Postpurge time

Details the postpurge time, including air damper movement and terminal 11 activity.

t13 Permissible afterburn time

Covers the permissible afterburn time, noting that a flame signal is still allowed.

D-A End of control program

Marks the end of the control program, where flame detection and simulation tests restart.

Control sequence under fault conditions and lockout indication

Lockout indication

Explains lockout indication positions related to no input signal or specific fault types.

Lockout indicator

Describes the lockout indicator's function and how it shows startup sequence or postpurge status.

Connection diagrams (for variants, refer to «Connection examples»)

Sequence diagram

Connection examples

Connection of actuators without end switch for the «CLOSED>> position

Illustrates connecting actuators without an end switch for the closed position.

Control of actuator during operation by control signals fed to terminal 17

Shows how to control the actuator using signals provided to terminal 17.

Control of <<BVx>> via terminal 20

Details the control of fuel valves (BVx) using terminal 20.

Wiring required with LAL2 for operation with no air pressure supervision

Specifies wiring for LAL2 when air pressure supervision is not used.

Semiautomatic startup

Explains the manual startup procedure using buttons and the role of L3 indicator.

Connection examples and program sequence (cont'd)

2-stage expanding flame burner

Shows load control and actuator connection for 2-stage expanding flame burners.

Modulating expanding flame burner

Illustrates load control and actuator connection for modulating expanding flame burners.

Legend

Lockout indication positions when there is no input signal (see Control sequence in the event of faults):

Time table

Dimensions