Siemens Oil Burner Control Service Manual

Oil Burner Controls

LOA3...

ISO 9001

Mechanical design

Ordering

for single- or two-stage pressure-jet burners with intermittent operation

118

LOA2...

Burner controls for automatic startup, control and supervision of pressure-jet oil burners with an oil throughput of up to 30 kg / h. The burner controls are tested to EN 230 and CE-certified in compliance with the directives for electromagnetic compatibility.

The LOA2... / LOA3... and this data sheet are intended for use by OEMs that integrate the burner controls in their products!

The burner controls are of plug-in design. The casing is made of impact-proof and heatresistant plastic and accommodates the – thermal-electric sequence switch which acts on a multiple snap-action switching

system

– flame signal amplifier with the flame relay – lockout reset button with integrated fault indication lamp

Burner control refer to table overleaf Flame detectors

– Photo-resistive detectors QRB1... refer to data sheet 7714 – Blue-flame detectors QRC1... refer to data sheet 7716

Plug-in base, without cable gland holder or without cable holder – With screw terminals AGK11

Plug-in base, for clip connection

– Clipses (single pieces in lots of 100) – Clipses (10,000 pieces on strap) – Mounting tool – Removal tool

Cable gland holder for 5 x Pg11, for insertion in plug-in base AGK65 Cable holder, for insertion in plug-in base and introduction of cable AGK66 Spacer (empty casing), to increase the overall height of LOA...- AGK21

types to LAB / LAI height Adapter, for replacing LAB1 / LAI... by LOA... KF8819

(rewiring of plug-in base not required) Service adapter, with signal lamps for making a functional check KF8833

and with jacks for making detector current measurements Remote reset module for use with LOA26... / LOA36... ARK21A27

(printed circuit board)

LOA3...

AGK12 AGK 4 408 5625 0 AGK 4 408 5626 0

KF8883 KF8884

Landis & Staefa CC1N7118E December 10, 1997 1/13

For safety reasons (self-test of flame supervision circuit, etc.), at least one controlled shutdown must take place every 24 hours

On request only

The type references given in the table apply to burner controls without base and without

Standard

With remote

For flash-steam

For incinerator

Type summary

flame detector.

Version Voltage

(VAC)

Type reference Under-

voltage

detection

Without bridging contact for the release contact of the oil pre-heater

3))

– – 13 13 10 15 – 15 – – 13 13 10 15 – 15 – – 13 13 10 20 2 20 x – 13 13 10 2 – 15

version

220 110 220 220

LOA21.171B27 LOA21.171B17 LOA21.173A27 LOA28.173A27

With bridging contact (fr**) for the release contact of the oil pre-heater

– – 13 13 10 15 – 15 – – 13 13 10 15 – 15 x x 13 13 10 15 – 15 x x 13 13 10 15 – 15 – x x 13 13 10 20 2 20 x x 13 13 10 35 2 35 –

x x 13 13 10 15 – 15 – x x 13 13 10 15 – 15 – x x 6 6 10 20 – 20

version

reset facility

220 110 220 110 220 220 220 220 220

LOA22.171B27 LOA22.171B17 LOA24.171B27 LOA24.171B17 LOA24.173A27 LOA24.174A27 LOA26.171B27 LOA36.171A27 LOA24.571C27

generators

x – 13 13 10 2 – 15 x – 13 13 10 2 – 15

plants or

220 110

LOA25.173C27 LOA25.173C17

similar

(s)t3(s)

t2 max.

(s)

t3n

(s)

t3n’

(s)

Replacement for:

LAB1,

LAI1, LAI2

LAI2.2, LAI4

–

LAI2.3 LAI2.3 LAI2.3

LAI2.3

LAI5

LAB2 LAB2

Legend

Times

Functions and components

LOA25... and LOA28... can only be used with photo-resistive detectors QRB1... Since LOA25... and LOA28... do not feature extraneous light lockout, they do not conform to EN 230

It is also possible to use an infrared flicker detector IRD1010 (refer to data sheet 7120)

Since LOA21... and LOA22... do not feature undervoltage detection, they do not conform to EN 230

tw Heating up time of «OH» until contact «OW»

delivers a signal

t2 Safety time t3 Pre-ignition time t3n Long post-ignition time t3n’ Short post-ignition time t4 Interval from establishment of flame to release

of the 2nd fuel valve

Burner control output signals Required input signals

A’ Beginning of startup sequence with burners

using an oil pre-heater «OH»

A Beginning of startup sequence with burners

using no oil pre-heater

B Time of flame establishment OH Oil pre-heater C Running position OW Release contact of «OH» D Controlled shutdown by «R» QRB Photo-resistive detector

AL Alarm device BV Fuel valve R Control thermostat or pressurestat EK1 Lockout reset button SA Actuator with automatic setback EK2 Remote lockout reset button Si External pre-fuse FR Flame relay TZ Thermal-electric sequence switch fr** Bridging contact for release contact of «OH» tz... Contacts of «TZ» FS Flame signal V Flame signal amplifier LED1 Indication of flame strength (green) W Limit thermostat or pressure monitor L1 Indication of faults (red) Z Ignition transformer L2 Indication of operation (orange)

t1 Pre-purge time

M Burner motor

Catch of flame relay for locking contact

«tz1» in the case of premature flame signals or for locking this contact when flame signal is correct

QRC Blue-flame detector

bl = blue br = brown sw = black

2/13 CC1N7118E December 10, 1997 Landis & Staefa

Connection diagram, control sequence

LOA21.171B27 LOA21.171B17 LOA22.171B27 LOA22.171B17 LOA24.171B27 LOA24.171B17 LOA24.571C27

fr** Not provided with the LOA21...

LOA22.171B27 / LOA22.171B17 / LOA24.171B27 LOA24.171B17 / LOA24.571C27

LOA21.171B27 / LOA21.171B17

LOA25.173C27 LOA25.173C17 LOA28.173A27

These types of LOA… may not be used with blue-flame detectors QRC...

fr** Not provided with the LOA28.173A27

LOA25.173C27 / LOA25.173C17

LOA28.173A27

Landis & Staefa CC1N7118E December 10, 1997 3/13

Connection diagram, control sequence

LOA21.173A27 LOA24.173A27 LOA24.174A27

fr** Not provided with the LOA21...

LOA24.173A27 / LOA24.174A27

LOA21.173A27

With remote reset module ARK21:

LOA26.171B27 LOA36.171A27

4/13 CC1N7118E December 10, 1997 Landis & Staefa

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