Page 1
Oil Burner Controls
LOA3...
ISO 9001
Mechanical design
Ordering
for single- or two-stage pressure-jet burners
with intermittent operation
1)
118
7
LOA2...
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)
2)
2)
2)
2)
2)
LOA3...
AGK12
AGK 4 408 5625 0
AGK 4 408 5626 0
KF8883
KF8884
Landis & Staefa CC1N7118E December 10, 1997 1/13
1)
For safety reasons (self-test of flame supervision circuit, etc.), at least one controlled shutdown
must take place every 24 hours
2)
On request only
Page 2
The type references given in the table apply to burner controls without base and without
Standard
Standard
With remote
For flash-steam
For incinerator
Type summary
flame detector.
Version Voltage
(VAC)
Type reference Under-
voltage
CE
detection
Without bridging contact for the release contact of the oil pre-heater
3))
3)
3)
1)
– – 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
3)
3)
2)
2)
– – 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 –
2)
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
1)
1)
x – 13 13 10 2 – 15
x – 13 13 10 2 – 15
plants or
220
110
LOA25.173C27
LOA25.173C17
similar
t1
(s)t3(s)
t2 max.
(s)
t3n
(s)
t3n’
(s)
t4
(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
1)
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
2)
It is also possible to use an infrared flicker detector IRD1010 (refer to data sheet 7120)
3)
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
K
«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
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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
Page 4
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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Internal diagram
LOA21.171B27
LOA21.171B17
LOA22.171B27
LOA22.171B17
LOA24.171B27
LOA24.171B17
LOA24.571C27
LOA25.173C27
LOA25.173C17
LOA28.173A27
fr** Not provided with the LOA21...
LOA21.173A27
LOA24.173A27
LOA24.174A27
fr** Not provided with the LOA28...
fr** Not provided with the LOA21...
Landis & Staefa CC1N7118E December 10, 1997 5/13
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Internal diagram
LOA26.171B27
LOA36.171A27
6/13 CC1N7118E December 10, 1997 Landis & Staefa
Page 7
Whenever a fault occurs, the supply of fuel is immediately interrupted.
Control sequence in
the event of faults
Indications
With every lockout, the control outputs will be de-energized in less than one second,
while terminal 10 (AL) for the remote indication of lockout receives voltage.
The LOA… can be reset no earlier than 50 seconds after lockout.
Extraneous light /
premature flame signal
Non-appearance of
flame
During the pre-purge time, no flame signal may be present.
If, however, a signal is delivered during this period of time, the LOA… locks out on expiry
of the pre-purge and safety time. Under these circumstances, the oil valve does not
open.
An erroneous flame signal can be caused, for instance, by
– premature establishment of flame due to a leaking oil valve
– extraneous light
– a short-circuit in the detector or its wiring
– faults in the flame signal amplifier, or similar
Exception: with the LOA25… and LOA28…, there will be no lockout, but burner startup
will be prevented until the premature flame signal is no longer present.
This means that LOA25… and LOA28… may be used only where the requirements of
EN 230 need not be met.
If, at the end of the safety time, there is no flame signal, the LOA… will immediately
lock out.
If, with the LOA25… and LOA28…, there are flame signal failures of short duration
during the safety time «t2» and the interval «t4», the ignition transformer will immediately
be switched on again.
The total duration of the repeated ignition attempts equals the safety time «t2»
(10 seconds).
Flame failure during
operation
Undervoltage detection
Fault position
Flame strength
Operation
On flame failure during operation, the LOA… will immediately shut down the fuel
supply and automatically recycle (restart attempts).
If flame failure occurs on completion of «t4», almost the complete startup sequence
will be restarted.
With burner controls featuring undervoltage detection, an additional electronic circuit
ensures that in the event of mains voltages below about 165 V, burner startup will be
prevented, or - without opening the oil valve - the burner control locks out.
The fault position is indicated by the lamp integrated in the reset button.
Only with the LOA36...
The green LED for indication of the flame strength is used for checking the flame signal.
To ensure reliable burner operation, this LED must be lit.
If, during burner operation, the green LED flickers or extinguishes, the light conditions at
the burner are inadequate, caused by dirt, for instance.
Only with the LOA36...
Landis & Staefa CC1N7118E December 10, 1997 7/13
If the contact of the control thermostat «R» is closed, the orange LED is lit, thus indicating
the start of the oil pre-heater's heating up phase (if fitted).
Page 8
Technical data
Burner control
LOA21.171B27
LOA21.171B17
LOA22.171B27
LOA22.171B17
LOA24.171B27
LOA24.171B17
LOA24.571C27
LOA25.173C27
LOA25.173C17
LOA28.173A27
LOA21.173A27
LOA24.173A27
LOA24.174A27
Mains voltage AC 220 V -15 %...240 V +10 %
AC 100 V -15 %...110 V +10 %
Mains frequency 50 Hz -6 %...60 Hz +6 %
External pre-fuse (Si) 10 A, fast
Input current to
- terminal 1 5 A (short-term 15 A during 0.5 s)
- terminal 3 5 A (excl. burner motor and oil pre-
heater)
Permissible loading of terminals
- Terminal 4 1 A
- Terminal 5 1 A
- Terminal 6 2 A
- Terminal 7 2 A
- Terminal 8 5 A
- Terminal 10 1 A
- Terminal 4 1 A
- Terminal 5 1 A
- Terminal 6 2 A
- Terminal 7 1.5 A
- Terminal 8 5 A
- Terminal 10 1 A
LOA26.171B27
LOA36.171A27
- Terminal 4 1 A
- Terminal 5 1 A
- Terminal 6 2 A
- Terminal 7 0.1 A
- Terminal 8 5 A
- Terminal 10 1 A
Environmental conditions
Condensation, formation of ice and ingress of water are not permitted.
• Transport IEC 721-3-2
– Climatic conditions class 2K2
- Temperature range -50...+60 °C
- Humidity < 95 % r.h.
- Mechanical conditions class 2M2
• Operation IEC 721-3-3
– Climatic conditions class 3K5
- Temperature range -20...+60 °C
- Humidity < 95 % r.h.
Power consumption approx. 3 VA
Degree of protection of housing IP40
Mounting position optional
Weight
- Burner control 180 g
- Base 80 g
- Cable gland holder 12 g
Indication of flame strength (only with LOA36...)
- Min. detector current LED lit with QRB... 60 µA ±15 %
- Min. detector current LED lit with QRC... 40 µA ±15 %
CE conformity to the directives of the EC
89 / 336 EEC incl. 92 / 31 EEC
and 73 / 23 EEC
8/13 CC1N7118E December 10, 1997 Landis & Staefa
Page 9
Flame detectors
For measurement circuits and lengths of detector cables, refer to data sheets 7714 (QRB…)
and 7716 (QRC…).
At AC 230 V or AC 110 V mains voltage
QRB...
QRB… detector current (typical)
Burner control
LOA21.171B27
LOA21.171B17
LOA22.171B27
LOA22.171B17
LOA24.171B27
LOA24.171B17 70 µµA 5.5 µµA 210 µµA
LOA24.571C27
LOA25.173C27
LOA25.173C17
LOA26.171B27
LOA28.173A27
LOA21.173A27
LOA24.173A27 45 µµA 5.5 µµA 45 µµA
LOA24.174A27
Minimum required
(with flame
present)
Maximum
permitted
(without flame)
Maximum possible
(with flame
present)
QRC1A...C27
LOA36.171A27 70 µµA 5.5 µµA 900 µµA
QRC… detector current (typical)
Burner control
LOA21.171B27
LOA21.171B17
LOA22.171B27
LOA22.171B17 70 µµA 5.5 µµA 110 µµA
LOA24.171B27 90 µµA at AC 110 V
LOA24.171B17
LOA24.571C27
LOA26.171B27
LOA25.173C27
LOA25.173C17 — — —
LOA28.173A27
LOA21.173A27
LOA24.173A27 45 µµA 5.5 µµA 45 µµA
LOA24.174A27
Minimum required
(with flame
present)
Maximum
permitted
(without flame)
Maximum possible
(with flame
present)
LOA36.171A27 70 µµA 5.5 µµA 110 µµA
Landis & Staefa CC1N7118E December 10, 1997 9/13
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10/13 CC1N7118E December 10, 1997 Landis & Staefa
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Safety notes
Non-observance of the following safety notes may lead to
unforeseen detrimental consequences, such as electric shock,
explosion, environmental damage, etc.
• In the geographical areas where DIN standards are in use, the
installation must be in compliance with VDE requirements, particularly
with the standards DIN / VDE 0100 and 0722!
In all other areas in compliance with the national and local standards
and regulations.
• All regulations and standards applicable to the particular application
must be observed!
• Installation and commissioning work must always be carried out by
qualified personnel!
• Ignition cables must always be laid separately, maintaining the greatest
possible distance to the unit and other cables!
• Observe the notes on the laying of detector cables (refer to «Flame
detectors»)!
Accessories
• Check wiring carefully before putting the burner control into operation!
• LOA... are safety devices. It is therefore not permitted to open, interfere
with or modify the units!
• The LOA... must be completely isolated from the mains before
performing any work on it!
• Check all safety functions when putting the burner control into
operation or after performing service work!
• Ensure protection against electric shock on the unit itself and on all
electrical connections through appropriate mounting!
• Electromagnetic emissions must be checked from an application point
of view!
• Always press reset button manually without using any tools or sharp-
edged objects!
Adapters
KF8833 KF8819
For description of adapters, refer to «Ordering».
Landis & Staefa CC1N7118E December 10, 1997 11/13
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12/13 CC1N7118E December 10, 1997 Landis & Staefa
Page 13
Dimensions
Burner controls
©
Plug-in bases
Dimensions in mm
Remote reset module
ARK21A27
AGK11 AGK12
Plug-in base with screw terminals. Hatched: position of Plug-in base for clip connections. Hatched: position of
insertable cable gland holder or cable holder insertable cable gland holder or cable holder
«B»: holes for cable entry «B»: holes for cable entry from below
«31», «32»: auxiliary terminals. «N»: neutral terminals, Connection choices:
connected to neutral input (terminal 2) 1, 3 and 4 each max. 4 clips Earthing: total of 6 clips,
Bottom: 4 earth terminals, joining a lug 2 max. 8 clips connected to lug «C»
for earthing the burner 5 through 10 eachmax. 3 clips for earthing the burner
11, 12 each max. 4 clips
31, 32 each max. 2 clips
The two narrow sides of the base are provided with catches which engage in the casing when the
latter is plugged in. To disengage the catches, a screwdriver must be slightly tilted in the appropriate
guiding slots.
Mandatory ( AGK11 and AGK12 ): connection of earthing lug «C» and of fixing screws in «A»
to the ground of the burner (using a metric screw with lockwasher or similar).
ARK21A27
Remote reset module for use with LOA26... / LOA36...
(printed circuit board with no housing).
Degree of protection IP00, that is, protection against
electric shock hazard must be ensured through
mounting.
Do not place any metal objects in the hatched area.
The module must be fitted with the help of spacers
made of plastic. Do not use spacers made of metal!
Landis & Staefa CC1N7118E December 10, 1997 13/13
1997 Landis & Staefa Produktion (Deutschland) GmbH
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