Siemens LMG2 Series User manual

Landis & Staefa Division CC1N7421E December 04, 1998 1/16
7421
Burner Controls LMG2...
Burner controls for the supervision of single- or two-stage forced draught gas or
gas / oil burners of small to medium capacity (typically up to 350 kW) in
intermittent operation.
The burner controls are certified to EN 230 and EN 298.
They carry the CE mark based on the directives for gas appliances and
electromagnetic compatibility.
The LMG2... and this data sheet are intended for use by OEMs which integrate the
burner controls in their products.
Burner controls of the LMG2... range are used for startup and supervision of single- or
two-stage gas or gas / oil burners in intermittent operation.
The flame is supervised with a detector electrode or UV flame detector QRA... (with
ancillary unit AGQ2...A27).
LMG21... / LMG22... in the same housing replace burner controls LGB21... / LGB22...
(refer to «Type summary») and, with the help of the respective adapters, burner controls
LFI7... and LFM1... (refer to «Ordering»).
Application-specific features
– Detection of undervoltages
– Air pressure supervision with function check of air pressure monitor during startup
and operation
– Electric remote reset
– Indication of error code and flame signal by means of LEDs in the lockout reset button
– Precise program times thanks to digital processing of signals
Available versions
• LMG21... / LMG22... For unlimited burner capacities (output on startup ≤120 kW)
Locking in the event of loss of flame during operation
• LMG25... For burner capacities ≤120 kW
Three repetitions in the event of loss of flame during
operation
ISO 9001
Use

2/16 CC1N7421E December 04, 1998 Landis & Staefa Division
To avoid personal injury, damage to property or the environment, the following
warning notes should be observed!
• It is not permitted to open, interfere with or modify the unit!
• Before performing any wiring changes in the connection area of the LMG2..., the
burner control must be completely isolated from the mains supply!
• Check wiring and all safety functions!
⇒Risk of explosion
• Press lockout reset button / operating button only manually (applying a force of no
more than 10 N), without using any tools or pointed objects!
• Check the connecting wires of the air pressure monitor for short-circuits (terminals 3,
6 and 11)!
• Check the electromagnetic compatibility with adjacent components!
• On applications with actuators, the actuator does not feed a position checkback signal
to the burner control.
The actuator running times must be matched to the burner control's program. An
additional safety check of the burner with the actuator must be made!
• The relevant national safety regulations must be complied with!
• Locate the ignition and detector electrode such that
– the ignition spark cannot arc over to the detector electrode!
⇒Risk of electric overloads
– the ignition spark cannot adversely affect ionization supervision!
• Installation and commissioning work may only be carried out by qualified staff!
• Observe the permissible length of the detector cables!
⇒Refer to «Technical data»
• Always run ignition cables separate from the unit and other cables while observing the
greatest possible distances!
• Before putting the burner control into operation, check wiring carefully!
• Install switches, fuses, earthing, etc., in compliance with local regulations!
• The connection diagrams shown apply to burner controls with earthed neutral. In the
case of ionization current supervision in networks with non-earthed neutral, terminal
2 must be connected to the earth conductor via an RC unit
(part no. ARC 4 668 9066 0)!
• Do not exceed the maximum permissible switching capacity of the connection
terminals!
• No mains voltage may feed back to the control´s output terminals from an external
supply or source.
When checking the functioning of devices controlled by the burner control (gas
valves, etc.), the burner control may never be plugged in!
• In the case of burners with no fan motor, an AGK25 must be connected to terminal 3
of the burner control, or else the burner cannot reliably be started up!
• For safety reasons, feed the neutral conductor to the neutral distributor on the plug-in
base, or to terminal 2, and from there to the various devices (fan, ignition transformer
and gas valves) or to an external neutral distributor!
Warning notes
Engineering notes
Mounting notes
Installation notes
Example
23745
BV2
BV1
Z
M
N7421a16/0398

Landis & Staefa Division CC1N7421E December 04, 1998 3/16
It is important to achieve practically loss-free signal transmission
• Cable length may not exceed 20 m
• Never run the detector cable together with other cables
– Line capacitances reduce the magnitude of the flame signal
– Use a separate cable
• Insulation resistance
– Between detector electrode and ground: minimum 50 MΩ
– Soiled detector electrode holders reduce insulation resistance, thus supporting
creepage currents
• Earth the burner in compliance with the relevant regulations; earthing the boiler alone
does not suffice
• Observe the polarity
Burner controls LMG2... detect wrong polarity of live and neutral, in which case they
initiate lockout at the end of «TSA»
– Plug-in design like predecessor type LGB2... (refer to «Dimensions»)
– Housing made of impact-proof, heat-resistant plastic
– Housing accommodates the
- control of the microcontroller with PCB relay for load control
- electronic flame signal amplifier (ionization)
- lockout reset button with integrated red fault indication lamp and green flame signal
lamp
– Made of impact-proof, heat-resistant plastic
– Available with screw terminals AGK11
– Cable entry optionally
- from the front or laterally by means of cable gland holders AGK65 or cable holders
AGK66
- from below through two holes of 16.2 mm dia.
– Provided with catches on the two narrow sides which engage in the burner control's
housing
- must audibly click when plugging in the LMG2...
- to disengage, a screwdriver must be slightly tilted in the guiding slots; then, the
burner control slightly lifts
– For length and width of plug-in base and positions of fixing holes, refer to
«Dimensions»
Electrical connection of
ionization current and UV
detectors
Mechanical design
Burner controls LMG2...
Plug-in base

4/16 CC1N7421E December 04, 1998 Landis & Staefa Division
The type references contained in the following table refer to LMG2... with no plug-in base and with no flame
detector. For ordering information on bases and other accessories, refer to «Ordering».
Type of flame
detector Type reference LMG2... tw s
max.
t1
s
min.
TSA
s
max.
t3n
s
ca.
t3
s
ca.
t4
s
ca.
t10
s
min.
t11
s ¹)
max.
t12
s ¹)
max.
Behaviour in the
event of flame failure
during operation
Burner controls for pre-purging with low flame air volume, without actuator control
Detector electrode (FE) LMG21.130A272) 87 32.6285 -- Lockout
or LMG21.230A273) 8 20 3 2.6 2 8 5 -- Lockout
UV detector QRA... LMG21.330A273) 8 30 3 2.6 2 8 5 -- Lockout
with LMG21.350A273) 830 5 4.62105 -- Lockout
AGQ2...A27 LMG21.550A273) 850 5 4.62105 -- Lockout
Burner controls for pre-purging with nominal air volume, with actuator control
Detector electrode (FE) LMG22.130A272) 8 7 3 2.6 3 8 3 12 12 Lockout
or LMG22.230A273) 8 20 3 2.6 3 8 3 16.5 16.5 Lockout
UV detector QRA... LMG22.233A27 8 20 3 2.6 3 8 3 30 30 Lockout
with LMG22.330A273) 8 30 3 2.6 3 8 3 12 11 Lockout
AGQ2...A27 LMG22.330A2703)4) 8 30 3 2.6 3 8 3 12 11 Lockout
Burner controls for pre-purging with low flame air volume, without actuator control
Detector electrode (FE) LMG25.230A27 8 20 3 2.6 2 8 5 -- Max. 3 repetitions
or LMG25.330A27 8 30 3 2.6 2 8 5 -- Max. 3 repetitions
UV detector QRA... LMG25.350A27 8 30 5 4.6 2 10 5 -- Max. 3 repetitions
with AGQ2...A27
tw Waiting time t4 Interval «TSAEnde-BV2» or «BV1-LR»
t1 Checked pre-purge time t10 Specified time for air pressure signal
TSA Ignition safety time t11 Programmed opening time for actuator «SA»
t3 Pre-ignition time t12 Programmed closing time for actuator «SA»
t3n Ignition time during «TSA»
1) Max. running time available for actuators «SA» 3) Also suited for use with direct fired air heaters
2) Also suited for use with flash-steam generators 4) Without integral fuse; use only in connection with bases
AGK86... or with an external microfuse of max. 6.3 A (slow)
Type summary
Legend

Landis & Staefa Division CC1N7421E December 04, 1998 5/16
Burner control refer to «Type summary»
Flame detectors
– Detector electrode delivered by others
– UV detector QRA... refer to data sheet 7714
Plug-in base with screw terminals AGK11
Cable gland holder AGK65
– For inserting in the plug-in base
– For 5 x Pg11, one each on the narrow sides, three on the wide side
Cable holder AGK66
– For inserting in the plug-in base
– With six knockout holes for cable entries (without cable tension relief)
- 1 x 8.8 mm dia. and 1 x 17 mm dia. (laterally)
- 3 x 7 mm dia. (on the front)
- 1 x rectangular opening 6 x 20 mm (on the front)
Pedestal AGK21
– For increasing the height to that of the LFM... or LFI7...
(refer to «Dimensions»)
RC unit ARC 4 668 9066 0
For supervision of the ionization current in networks with non-earthed neutral
PTC resistor (AC 230 V) AGK25
To generate load on terminal 3
(used with burners with no fan motor, e.g. atmospheric gas burners)
Ancillary unit for UV supervision AGQ2.1A27 (cable length 500 mm)
AGQ2.2A27 (cable length 300 mm)
Can be fitted under the plug-in base;
for dimensions, refer to «Dimensions»
Actuators (refer to data sheet 7808) SQN3...
Actuators (refer to data sheet 7804) SQN7...
Actuators (refer to data sheet 7806) SQN9...
Service adapter KF8872
For checking the functioning of the burner controls on the burner plant
– Functional check with indicator lamps
Note: with no load on the output terminals, the respective indicator lamp may
light up!
– Detector current measurement with jacks of 4 mm dia.
Test case KF8843 ¹)
For checking the functioning of the burner controls away from the burner
¹) With extended type connector for use with LMG...
Adapter / replacement types
No rewiring required
New type of burner
control Adapter type Predecessor type
LMG21... with adapter KF8853-K LFI7...
KF8880 LFM1... / 1...-F
LMG22... with adapter KF8853-K LFI7...
KF8880 LFM1...
Ordering

6/16 CC1N7421E December 04, 1998 Landis & Staefa Division
Operating voltage AC 230 V +10 % / -15 % Weight
- Burner control approx. 158 g
Mains frequency 50 Hz -6 %...60 Hz +6 % - Plug-in base AGK11 approx. 80 g
- AGK65... approx. 12 g
Power consumption 12 VA - AGK66... approx. 12 g
Primary fuse max. 10 A (slow) Degree of protection IP 40
Mounting position optional Max. cable length terminals 8 and 10 20 m
Environmental conditions Input current at terminal 12 max. 5 A
Transport IEC 721-3-2
Climatic conditions class 2K2 Identification code to EN 298
Temperature range -40...+60 °C LMG21... / LMG22... F T L L X N
Humidity < 95 % r.h. LMG25... F T C L X N
Mechanical conditions class 2M2
Operation IEC 721-3-3 CE conformity
Climatic conditions class 3K5 According to the directives of the European Union
Temperature range -20...+60 °C Electromagnetic compatibility EMC
Humidity < 95 % r.h. 89 / 336 EEC incl. 92 / 31 EEC
Condensation, formation of ice and ingress of
water are not permitted! Directive for gas appliances 90 / 396 EEC
Terminal rating At cos ϕ≥0.6 At cos ϕ= 1
- Terminal 3 max. 2.7 A
(15 A during max. 0.5 s) max. 3 A
- Terminals 4, 5 and 7 max. 1.7 A max. 2 A
- Terminal 10 max. 1 A max. 1 A
Technical data
LMG2...

Landis & Staefa Division CC1N7421E December 04, 1998 7/16
At mains voltage UN= AC 230 V
Detector voltage across terminals 1 and 2 or ground
(AC voltmeter Ri ≥10 MΩ)AC 115...230 V
Switching thresholds (limit values)
Switching on (flame on) DC ammeter, Ri ≤5 kΩ)≥DC 1 µA
Switching off (flame off) DC ammeter, Ri ≤5 kΩ)≤DC 0.5 µA
Requested sensor current for reliable operation ≥2 µA
Max. short-circuit current across terminals 1
and 2 or ground (AC ammeter, Ri ≤5 kΩ)AC 50 µA
Note:
With the same flame quality, the detector current with LMG2... is lower than with
LGB2...!
Flame supervision takes place by making use of the conductivity and rectifying effect
of hot flame gases.
The flame signal amplifier responds only to the DC current component of the flame
signal.
⇒A short-circuit between detector electrode and ground causes the burner to initiate
lockout
For detector currents, refer to «Technical data».
C Electrolytic capacitor 100...470 µF; DC 10...25 V
FE Detector electrode
M Microammeter (Ri max. = 5000 Ω)
Flame supervision with
detector electrode
Measuring circuit
LMG2... 1
7421v01/0598
M
C
+
+
-
FE
Legend

8/16 CC1N7421E December 04, 1998 Landis & Staefa Division
Operating voltage AC 230 V +10 % / -15 % Max. permissible cable lengths
QRA... to AGQ2...A27 20 m
Mains frequency 50 Hz -6 %...60 Hz +6 % (separate cable)
AGQ2...A27 to LMG2... 20 m
Environmental conditions
Transport IEC 721-3-2 Weight
Climatic conditions class 2K2 AGQ2...A27 approx. 140 g
Temperature range -40...+60 °C QRA... refer to data sheet 7714
Humidity < 95 % r.h.
Mechanical conditions class 2M2 Mounting position optional
Operation IEC 721-3-3
Climatic conditions class 3K5 Degree of protection IP 40
Temperature range -20...+60 °C
Humidity < 95 % r.h. Power consumption 4.5 VA
At mains voltage UN
AC 220 V AC 240 V
Detector voltage at QRA... (with no load)
To the end of «t10» and after a controlled shutdown DC 400 V DC 400 V
From the beginning of «t1» DC 300 V DC 300 V
Detector voltage
Loading by DC meter Ri > 10 MΩ
To the end of «t10» and after a controlled shutdown DC 380 V DC 380 V
From the beginning of «t1» DC 280 V DC 280 V
DC current detector signals with UV detector QRA... min. required max. possible
Measurement made on UV detector 200 µA 500 µA
For UV detector QRA..., refer to data sheet 7712
Ancillary unit AGQ2...A27
When used in connection with burner controls LMG2..., the UV ancillary unit
AGQ2...A27 is required.
Using circuitry (A) or (B), the quench test on ageing UV detectors can be made in two
different ways:
Type of circuitry:
(A) Operation with a permanent line
• UV test at twice the supply voltage
across the UV cell on startup and after a
controlled shutdown
(B) Operation with a controlled line
• UV test at twice the supply voltage on
startup only, during the interval between
controlled startup and air pressure signal
– No voltage at the UV cell after a
controlled shutdown
– No full substitute for mode (A)
described above since an aged UV cell
can regenerate itself
AGQ2.1A27
AQG2.2A27
Measurement made on UV detector
C Electrolytic capacitor 100...470 µF; DC 10...25 V
bl blue M Microammeter Ri max. 5000 Ω
sw black QRA... UV detector
gr grey
Flame supervision with
AGQ2...A27 and UV
detector QRA...
Legend
Connection diagram
12 211
*1
7421a11/0598
GP/SB
R/W
L
L
N
QRA +
-
br bl rt sw
AGQ2...A27
sw bl
(B)
(A)
LMG2...
Measurement circuit
AGQ2...A27
sw
bl
sw
bl
QRA M
-
+
C+
LMG2...
12
7421v02/0598
+
-
Legend

Landis & Staefa Division CC1N7421E December 04, 1998 9/16
LMG21... / LMG25... LMG22...
A Start command (switching on by «R») B-B´ Interval for establishment of flame
C Operating position of burner reached C-D Burner operation
D Controlled shutdown by «R»
• Burner is immediately shut down
• Burner control is immediately ready
for new startup
AL Fault status signal (alarm) M Fan motor
BV... Fuel valve R Control thermostat / pressurestat
EK2 Remote reset button SA Actuators
FS Flame signal SB Safety limit thermostat
GP Gas pressure monitor W Limit thermostat / pressure monitor
LP Air pressure monitor Z Ignition transformer
LR Load controller
• Burner control is reset
• All contacts in the line are closed
• Fan motor «M» or AGK25 is connected
• Air pressure monitor «LP» is in idle position
• No undervoltage
Safety shutdown in the event
– the mains voltage is lower than typically AC 160 V
– a restart is made when the mains voltage exceeds AC 195 V
After no more than 24 hours of continuous operation, the burner control initiates a safety
shutdown, followed by a restart.
If the connections of line (terminal 12) and neutral (terminal 2) have been exchanged,
the burner control will initiate lockout at the end of «TSA».
• If a fault occurs, all outputs will immediately be deactivated (< 1 s)
• On restoration of power, a restart will be made with the full program sequence
• If the operating voltage drops below the undervoltage threshold (for threshold, refer to
«Functions»), a restart will be made with the full program sequence
• If there is a premature faulty flame signal during «t1» ⇒Lockout
• If the contact of the air pressure monitor «LP» has welded in the working position:
prevention of startup and, after 8.5 seconds, lockout
• If the contact of the air pressure monitor «LP» has welded in the idle position: lockout
at the end of «t10»
• If there is no air pressure on completion of «t10» ⇒Lockout
• If the burner does not ignite by the end of «TSA» ⇒Lockout
• If flame is lost during operation
⇒LMG21... / LMG22... lockout
⇒LMG25... three repetitions
When lockout occurs, the burner control can immediately be reset! In that case, keep
lockout reset button depressed for a minimum of 0.5 seconds and a maximum of 3
seconds!
Functions
SB / R / W / GP
AL
M
LP
BV1
BV2
Z
FS
tw
t1
t3n
TSA t4
7421d05/0498
t10
EK2
12
10
3
7
4
5
11
1
8
t3
AB
B´
CD
400 ms
SB / R / W / GP
AL
M
LP
SA
BV1
(LR) BV2
Z
FS
tw
t1
t3n
TSA t4
7421d06/1098
t10+t11
t12
EK2
12
10
3
7
4
5
11
1
8
AB
B´ C
D
9
400 ms
t3
Legend
Prerequisites for startup
Undervoltage
Checked intermittent
operation
Reversed polarity
protection
Control program in the
event of fault
Resetting the LMG2...

10/16 CC1N7421E December 04, 1998 Landis & Staefa Division
Connection diagram
LMG21... / LMG25...
Application examples
Control of actuators of two-stage or two-stage modulating burners.
Checked pre-purging «t1» with low flame air volume.
Exactly the same low flame actuator positions during startup and operation!
For information about actuators «SA»:
SQN3...: refer to data sheet 7808
SQN7...: refer to data sheet 7804
SQN9...: refer to data sheet 7806
SQN3...121... / two-stage control SQN91.140... / two-stage control
* Note: with two-stage modulating burners (with gas regulation
damper «RV»), «BV2» and the dotted connection between
terminals (*) are not required
SQN7...244 / two-stage control
¹) Wire link required only with LGB21..., not with LMG21... / LMG25...
12 210 83611 7451
R/W
GP/SB
HS
0
I
L
N
AL
EK2
MLP ZBV2
FE
7421a06/0598
BV1
LMG21.../25...
9
1)
LMG2... 4
12
5
LR SA
ON/OFF
L
SB/R/W BV1
RV
BV2
7421a07/1098
12 210 8 3611 97451
HS
0
I
NL
AL
EK2 MLP
GP/SB
R/W
ZBV1
(*)
LR
FE
BV2*
(*)
N1267543
b1 b2 B
ab
III
a3
ab
II
MS
I
ab
a2
ab
IV
A
ab
V
RV
LK
7421a03/1098
LMG21.../22.../25...
12 210 83 611 7 451
AL
EK2 MLP
GP/
SB
R/W
ZBV1
LR
FE
BV2
HS
NL
0
I
NN125
364
7421a08/1098 LK
SA
IV
II
MS I
C3
D
K2
C31
III
R32 R1
V
K1
ab
ab ab ba
ab
-+
+
LMG21.../22.../25...
II
KL
Zu III
LKP
NL
t1
IV
III
IV
I
t
IV
7421d03/1098
9
1
b1
LP
HS
8N
4
N
I
L
B
a1
A
LMG21.../22.../25...
12
EK2
AL
210
3
5 3276
b2
a2
M
c1
C
R/W
GP/
SB
6
11 4
FE
5 1
0
7421a09/1098
8
IIIII IVI
Z
BV1
LR
7
BV2
M
I
KL
zu
NL
LKP
t
I
III III
IV IV
II
TSA
t4
t1

Landis & Staefa Division CC1N7421E December 04, 1998 11/16
Connection diagram
LMG22...
Application examples
Control of actuators of two-stage or two-stage modulating burners.
Checked pre-purging «t1» with nominal load air volume.
For information about actuators «SA»:
SQN3...: refer to data sheet 7808
SQN7...: refer to data sheet 7804
SQN9...: refer to data sheet 7806
SQN3...151... or SQN3...251... SQN90.220... / two-stage modulating control
* Note: with two-stage modulating burners (with gas regulation
damper «RV»), «BV2» and the dotted connection between
terminals (*) are not required
SQN7...454 / two-stage control, SQN7...424 / two-stage control,
single-wire control two-wire control
12 210 83611 7451
GP/SB
R/W
HS
0
I
L
N
AL
EK2
MLP ZBV2
FE
7421a15/0598
BV1
9
SA
LMG22...
LMG2... 4
9
5
LR SA
L
SB/R/W BV1
RV
BV2
7421a19/1098
12
12 2 10 836119 5 7
*
41
GP/SB
R/W AL
EK2
M
LP LR ZBV1
FE
BV2
*
*
L
N
0
I
HS
N8
12756 349
7421a13
/10
98
LK
RV
SA
R1
K2
C2 K1
+
R3
D
-+
R2
C1
I
MS
C3
III
II
V
LMG22...
KL
Zu
III
LKP
NL
t1
III
t
7421d04/0498
I
II
t4
TSA
12 2 10 8361195741
GP/SB
R/W AL
EK2
M
LP LR ZBV1
FE
HS
0
I
NL
6810 21
379
7421a14/0598
RV
LK
SA
R1
K2
R3
C2 K1
+
D
-
+
R2
C1
I
MS
C3
III
II
LMG22...
LKP
zu
KL
NL
t
IIIIII
IVIV
II
II
t1
TSA
t4
N
I
HS
L
LMG 22...
R/W
GP/SB
12
EK2
38
Z
LR
5
FE
BV1
BV2
0
7421a17/
10
98
B
CA
a1
b1
c1
b2
a2
M
7
9
102
N5 4 1
3
2867
IIIII IVI
611
AL
4 1
M
LP
4N15
N
I
HS
L
A
b1
a1
LMG22...
R/W
GP/SB
12
AL
EK2
38
3268 7
b2
a2
M
B
Z
LR
FE
BV1
41
0
12
7421a18/
10
98
10 9 5 7
BV2
IIIIIIIV
2 6 11
LP
M

12/16 CC1N7421E December 04, 1998 Landis & Staefa Division
Other application examples
Burner without fan assistance and without «LP» Burner with fan control via auxiliary contactor «HS» with «LP»
Legend
AGK25... PTC resistor LP Air pressure monitor
AL Fault status signal (alarm) LR Load controller
BV... Fuel valve M Fan motor
Dbr... Wire link MS Synchronous motor
EK2 Remote lockout reset button NL Nominal load
FE Detector electrode QRA... UV detector
FS Flame signal R Control thermostat / pressurestat
GP Gas pressure monitor RV Gas regulation damper
HS Main switch SA Actuator SQN...
K1...4 Internal relays SB Safety limit thermostat
KL Low flame t Time
LK Air damper W Limit thermostat / pressure monitor
LKP Air damper position Z Ignition transformer
23 11 6
AGK
7421a04/1098
*
12 2311 6
GP/SB
R/W
L
N
M
HS AGK25 LP
7421a05/0398
* Note: different from LGB2...

Landis & Staefa Division CC1N7421E December 04, 1998 13/16
• Burner control has initiated lockout
⇒Red fault LED on • Reset
Press lockout reset button for 0.5...3 s
AL
• Diagnosis of cause of fault
– Wait > 10 s
– Press lockout reset button for > 3 s
– Read blink code of red fault LED
⇒«Error code table»
• Burner control in operation
⇒Green flame signal LED on • Restart
Press lockout reset button for 0.5...3 s
FS
• Read flame establishment time
– Press lockout reset button for > 3 s
– Read blink code of green flame signal
LED
⇒«Error code table»
After lockout, the red fault LED is steady on.
For reading the cause of fault, refer to the blink code given in the following table:
Error code table
Blink code Possible cause
2 x
•• • No establishment of flame at the end of «TSA»
– Faulty or soiled detector electrode
– Faulty or soiled fuel valves
– Poor adjustment of burner
3 x
••• • Air pressure monitor does not close
– «LP» faulty
– «LP» incorrectly adjusted
– Fan motor does not run
4 x
•••• • Air pressure monitor does not open or extraneous light on burner startup
– «LP» faulty
– «LP» incorrectly adjusted
5 x
••••• • Extraneous light during pre-purging
– Or internal device fault
7 x
••••••• • Loss of flame during operation
– Poor adjustment of burner
– Faulty or soiled fuel valves
– Short-circuit between detector electrode and ground
8...17 x
••••••••
...................
••••••••••
•••••••
• Free
18 x
••••••••••
••••••••
• Air pressure monitor opens during pre-purging or operation
– «LP» incorrectly adjusted
– Four times loss of flame during operation (LMG25)
19 x
••••••••••
•••••••••
• Faulty output contact
– Wiring error
– External power supply on output terminal
20 x
••••••••••
••••••••••
• Internal device fault
During the time the cause of the fault is diagnosed, the control outputs are deactivated.
– The burner remains shut down
– Exception: fault status signal «AL» at terminal 10
The burner is switched on only after a reset is made.
– Press lockout reset button for 0.5...3 seconds
Operating concept
Diagnosis of cause of
fault
FS AL
Red LED on
LED on (waiting time > 10 s)
Press lockout reset
button
for > 3 s
Blink code
~
Off
Approx.
3 s
Blink code
~
Fault

14/16 CC1N7421E December 04, 1998 Landis & Staefa Division
This function measures the flame establishment time with ionization supervision.
With the AGQ2..., this function cannot be used.
In the running position, the green flame signal LED is steady on.
The flame establishment time is read in the running position according to the following
sequence:
When reading the flame establishment time, the burner is put out of operation.
Reading is in the form of a blink code as multiples of 0.4 s.
Diagnostics table
Blink code Flame establishment
time with «TSA» = 3 s Flame establishment time with «TSA» = 5 s
1 x
•≤0.4 s ≤0.4 s
2 x
•• ≤0.8 s ≤0.8 s
7 x
••••••• ≤2.8 s ≤2.8 s
12 x
••••••••••
••
--- ≤4.8 s
• The flame establishment time is the period of time from the moment «BV1» opens to
the moment the flame signal is detected for the first time
• The flame establishment time remains stored for one startup sequence and is re-
ascertained the next time the burner is started up
• During the period of time the flame establishment time is interrogated, the fault status
outputs are deactivated:
– Burner remains shut down
It is restarted only after a reset is made
– Press lockout reset button for 0.5...3 seconds
Note:
If ignition and ionization electrode are not correctly located, ignition effects may
lead to incorrect measurements.
Interrogation of flame
establishment time
FS AL
Green LED on
LED on
Press lockout
reset button for
> 3 s
Blink code
~
Off
Approx. 3 s
Blink code
~
Operation

Landis & Staefa Division CC1N7421E December 04, 1998 15/16
EK Lockout reset button (internal) NT Power section
FSV Flame signal amplifier Si Fuse
Internal diagram
LMG21... / LMG25...
NT
12 2
R/W/GP/SB
N
AL
K1
10
K2
7
Z
3
K3
K4
4 5
BV1
BV2
EK2
8
6
LP
11
FSV
1
FE
Control of microcontroller
7421a01e/1298
L
Si
M
RESET
EK
FS green
AL red
LMG22...
NT
12 2
R/W/GP/SB
N
AL
K1
10
K2
7
Z
3
K3
K4
4
5
BV1
BV2
EK2
8
6
LP
11
FSV
1
FE
Control of microcontroller
RESET
7421a02e/1298
9
M
LR
SA
L
EK
Si
MBV2
FS green
AL red
Legend

16/16 CC1N7421E December 04, 1998 Landis & Staefa Division
Dimensions in mm
AGK11...
Plug-in base with screw terminals
Hatched: position of cable gland holder or cable holder
«B»: holes for cable entry
«31», «32»: auxiliary terminals
«N»: neutral terminals, connected to neutral input (terminal 2)
Underneath: 4 earth terminals, joining a lug for earthing the burner
Mandatory: (AGK11...)
Connection of earthing lug «C» and fixing screws in «A» to the burner ground (using a metric screw with a
lockwasher or similar)
Dimensions
Burner control
5,5
62,5
9
25
25
88
91
1
41,5
22
46,5
62
7421m01/0398
TSA 3 sec.
CE - 0085AT0010
9550
12VA IP40
FS
< 3 sec. Reset
> 3 sec. Diagn.
AL
230 V~ 50-60 Hz
Burner control with plug-in base AGK11... and
cable gland holders AGK65...
(can be inserted in the base)
Plug-in base
7421m02/0398
24 24
30 30
11 4,5Ø
C
B
4
17
23,5
A
16,2
5,4
Ø
Ø
N31 32
123456 789101112
Ancillary unit AGQ2...A27
90,5
60
220 69 6
AB6
5,4 5,4
13
18
4
65,6 27,5
7421m04/0398
Type reference Dimensions
AB
AGQ2.1A27 500 19
AGQ2.2A27 300 34
1998 Landis & Staefa Produktion GmbH