Siemens LMO14 Series User manual

CC1N7130en
15.10.2002
Siemens Building Technologies
HVAC Products
ISO 9001
7130
Oil Burner Controls LMO14...
LMO24...
LMO44...
Microcontroller-based oil burner controls for the startup, supervision and control
of forced draft oil burners in intermittent operation. Standard versions with an oil
throughput up to 30 kg / h, special versions above 30 kg / h.
The LMO14..., LMO24..., LMO44... and this Data Sheet are intended for use by
OEMs which integrate the burner controls in their products.
Use, features
The LMO... are designed for the startup and supervision of single- or 2-stage forced
draft oil burners in intermittent operation. Yellow-burning flames are supervised with
photoresistive detectors QRB..., blue-burning flames with blue-flame detectors QRC...
In terms of housing dimensions, electrical connections and flame detectors, the LMO...
are identical with the LOA... oil burner controls.
- Oil burners with fans to EN 267
- Burner controls for use with atomization oil burners of monoblock design to EN 230
- LMO44... for use with stationary direct-fired air heaters
- Undervoltage detection
- Electrical remote reset
- Bridging contact for oil preheater
- Monitoring of time for oil preheater
- Accurate and reproducible control sequence through digital signal handling
- Controlled intermittent operation after 24 hours of continuous operation
- Limitation of the number of repetitions
- Multicolor indication of fault and operational status messages
Use
General features

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Warning notes
To avoid injury to persons, damage to property or the environment, the following
warning notes should be observed!
Do not open, interfere with or modify the unit!
·Before performing any wiring changes in the connection area of the LMO..., com-
pletely isolate the burner control from the mains supply (all-polar disconnection)
·Ensure protection against electric shock hazard by providing adequate protection
for the burner control’s connection terminals
·Check to ensure that wiring is in an orderly state and that the wires are firmly con-
nected
·Press the lockout reset button / operation button only manually (applying a force of
no more than 10 N), without using any tools or pointed objects
·Fall or shock can adversely affect the safety functions. Such units may not be put
into operation, even if they do not exhibit any damage
·When replacing LOA26... or LOA36..., any remote lockout reset module ARK21...
or similar modules contained in the burner or boiler must be removed
Mounting notes
·Ensure that the relevant national safety regulations are complied with
Installation notes
·Installation work must be carried out by qualified staff
·Always run the high-voltage ignition cables separately while observing the greatest
possible distances to the unit and to other cables
·Install switches, fuses, earthing, etc., in compliance with local regulations
·Ensure that the maximum permissible amperages will not be exceeded (refer to
«Technical data»)
·Do not feed external mains voltage to the control outputs of the unit. When testing
the components controlled by the burner control (fuel valves, etc.), the LMO... may
never be plugged in
·Do not mix up live and neutral conductors
Electrical connections of the 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 maximum permissible lengths of the detector cables (refer to «Techni-
cal data»)
ARK21...

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Commissioning notes
·Commissioning work must be carried out by qualified staff
·When commissioning the plant or when doing maintenance work, make the follow-
ing safety checks:
Safety check Anticipated response
a) Burner startup with flame detector dark-
ened
Lockout at the end of «TSA»
b) Burner startup with flame detector ex-
posed to extraneous light
Lockout after 40 seconds at the
latest
c) Burner operation with simulated loss of
flame; for that purpose, darken the flame
detector during operation and maintain
that state
Repetition followed by lockout at
the end of «TSA»
Norms and standards
Conformity to EEC directives
- Electromagnetic compatibility EMC (immunity) 89 / 336 EEC
- Low-voltage directive 73 / 23 EEC
Service notes
·Maintenance work must be carried out by qualified staff
·Each time a unit has been replaced, check to ensure that wiring is in an orderly
state and that the wires are firmly connected. Make the safety checks as detailed in
«Commissioning notes»
·Use the service adapters KF8885 / KF8833 / KF8840 for only short periods of time
Disposal notes
The unit contains electrical and electronic components and may not be disposed of
together with household waste.
Local and currently valid legislation must be observed.

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Mechanical design
The housing is made of impact-proof, heat-resistant and flame-retarding plastic.
It is of plug-in design and engages audibly in the base.
The housing accommodates the
- microcontroller, which controls the control sequence, and the control relays for load
control
- electronic flame signal amplifier
- lockout reset button with its integrated 3-color signal lamp for operational status
and error messages and the socket for connecting the interface adapter OCI400
- Multicolor indication of operational status and error messages
- Transmission of operational status and error messages and detailed service infor-
mation through additional interface adapter OCI400 and PC Windows software
ACS400
Type summary
¹) Remote
reset
Times Comparable
type of
LOA...
Type reference Mains
voltage
Fuel
valve
stages
Burner
capacity
tw
max.
t1 / t1´
min.
TSA-
max.
t3
min.
t3n
max.
t4
min.
Standard versions
LMO14.111B2 AC 230 V 1 < 30 kg / h ··5 s 15 / 16 s 10 s 15 s 10 s --- LOA24.171B27
LOA26.171B27
LOA36.171A27
LMO14.111B1 AC 110 V 1 < 30 kg / h ··5 s 15 / 16 s 10 s 15 s 10 s --- LOA24.171B17
LMO14.113B2 AC 230 V 1 < 30 kg / h ··5 s 15 / 16 s 10 s 15 s 3 s --- LOA24.173A27
LMO24.111B2 AC 230 V 2 < 30 kg / h ··5 s 15 / 16 s 10 s 15 s 10 s 15 s LOA24.171B27
LOA26.171B27
LOA36.171A27
LMO24.111B1 AC 110 V 2 < 30 kg / h ··5 s 15 / 16 s 10 s 15 s 10 s 15 s LOA24.171B17
LMO24.113B2 AC 230 V 2 < 30 kg / h ··5 s 15 / 16 s 10 s 15 s 3 s 15 s LOA24.173A27
LMO24.255B2 AC 230 V 2 </> 30 kg/h ··5 s 25 / 26 s 5 s 25 s 5 s 15 s ---
Version for flash-steam generators
LMO24.011B2 AC 230 V 2 < 30 kg / h ··5 s 5 / 6 s 10 s 5 s 10 s 15 s LOA24.571C27
Suited for direct-fired air heaters
LMO44.255B2 AC 230 V 2 </> 30kg / h ··5 s 25 / 26 s 5 s 25 s 5 s 5 s LOA44.252A27
TSAmax. Maximum ignition safety time
tw Waiting time
t1 Prepurge time
t1’ Purge time
t3 Preignition time
t3n Postignition time
t4 Interval from flame signal to release of «BV2»
¹) Bridging contact for oil preheater
Indication and diagnosis
Legend

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Ordering
Oil burner control (without plug-in base) refer to «Type summary»
Electrical connections refer to Data Sheet 7201
- Plug-in base AGK11...
- Cable holders AGK65..., AGK66, AGK67...
- Cable strain relief elements for AGK67...
Electrical connections refer to Data Sheet 7203
- Plug-in base AGK13...
- Plug-in housung AGK56...
- Cover AGK68...
Flame detectors
- Photoresistive detectors QRB1... refer to Data Sheet 7714
- Blue-flame detector QRC1... refer to Data Sheet 7716
Diagnostic tool refer to Data Sheet 7614
- Interface adapter OCI400
- PC Windows software ACS400
Demo case KF8891
- For demonstrating the functions of burner controls
(refer to User Manual B7989)
Test case KF8843
- For checking the functions of burner controls
(refer to Operating Instructions C7981)
Test adapter KF8885
- For checking the functions of burner controls on the burner
- With switch for manual startup of the burner
- With switch for simulating the oil preheater’s release contact
- With 2 pairs of jacks for measuring the flame detector current
(refer to Operating Instructions C7986)
Test adapter KF8833
- For checking the functions of burner controls on the burner
- With signal lamps for program indication
- With one pair of jacks for measuring the flame detector current
Test adapter KF8840
- For checking the functions of burner controls on the burner
- With signal lamps for program indication
- With on / off switch for simulating the flame signal
- With holes for checking the control voltages at the tabs of the burner control
- With one pair of jacks for measuring the flame detector’s resistance

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Technical data
Mains voltage AC 230 V +10 % / -15 %
AC 110 V +10 % / -15 %
Mains frequency 50...60 Hz ±6 %
External primary fuse (Si) 6.3 A (slow)
Power consumption 12 VA
Mounting orientation optional
Weight approx. 200 g
Safety class I
Degree of protection IP 40 (to be ensured through mounting)
Perm. cable lengths max. 3 m at a line capacitance of 100 pF/m
Detector cable laid separately 20 m
Remote reset laid sepatately 20 m
Max. perm. amperage at cos j³0.6 LMO14... LMO24... / LMO44...
Terminal 1 5 A 5 A
Terminals 3 and 8 3 A 5 A
Terminals 4, 5, 6 and 10 1 A 1 A
Transport DIN EN 60 721-3-2
Climatic conditions class 2K2
Mechanical conditions class 2M2
Temperature range -30...+70 °C
Humidity < 95 % r.h.
Operation DIN EN 60 721-3-3
Climatic conditions class 3K5
Mechanical conditions class 3M2
Temperature range
- LMO14... / LMO24...
- LMO44...
-5...+60 °C
-20...+60 °C
Humidity < 95 % r.h.
Condensation, formation of ice and ingress of water are not permitted!
Min. detector current
required
(with flame)
Max. perm. detector
current
(without flame)
Max. possible detector
current with flame
(typically)
QRB... 45 µA 5.5 µA 100 µA
QRC... 70 µA 5.5 µA 100 µA
The values given in the table above only apply under the following conditions:
- Mains voltage AC 230 V
- Ambient temperature 23 °C
Detector current in operation:
- Flame signal instable
- Green LED flashing
Detector current in operation:
- Flame signal stable
- Green LED steady on
QRB... < 45 µA > 45 µA
QRC... < 45 µA > 45 µA
The values given in the table above only apply under the following conditions:
- Mains voltage AC 230 V
- Ambient temperature 23 °C
General unit data
Environmental
conditions
Flame supervision with
QRB... and QRC...
Green LED for opera-
tional status indication

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QRB... QRC...
12
11 LMO...
bl
µA DC
+
QRB...
7130v01/0700
sw
12
11 LMO... 1
swbl br
µA DC
+
QRC1...
7130v02/0700
Legend
µA DC DC microammeter
with an internal
resistance of
Ri = max. 5 kW
bl Blue
sw Black
br Brown
As an alternative to detector current measurement, the diagnostic tool OCI400 /
ACS400 can be used. In that case, connection of a DC microammeter is not required.
Measuring circuit
for detector current

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Function
·Burner control is reset
·All contacts in the line are closed and there is demand for heat
·No undervoltage
·Flame detector is darkened and there is no extraneous light
·Safety shutdown in the operating position takes place should mains voltage drop
below about AC 165 V (UN= AC 230 V)
·Restart is initiated when mains voltage exceeds about AC 175 V (UN= AC 230 V)
If the oil preheater’s release contact does not close within 10 minutes, the burner control
will initiate lockout.
After 24 hours of continuous operation at the latest, the burner control will initiate auto-
matic controlled shutdown followed by a restart.
If lockout occurs, the outputs for the fuel valves, burner motor and ignition equipment
will immediately be deactivated (< 1 second).
Cause Response
Mains failure Restart
Voltage has fallen below the undervoltage
threshold
Restart
Extraneous light during «t1» Lockout at the end of «t1»
Extraneous light during «tw» Prevention of startup, lockout after 40 sec-
onds at the latest
No flame at the end of «TSA» Lockout at the end of «TSA»
Loss of flame during operation Max. 3 repetitions, followed by lockout
Oil preheater’s release contact does not
close within 10 minutes
Lockout
In the event of lockout, the LMO... remains locked and the red signal lampLED will light
up. The burner control can immediately be reset.
This state is also maintained in the case of mains failure.
Whenever lockout occurs, the burner control can immediately be reset. To do this, press
the lockout reset button for about 1 second (< 3 seconds).
If the flame is lost during «TSA», the burner will be reignited, but only until the end of
«TSAmax».
This means that several ignition attempts can be made during «TSA» (refer to «Control
sequence»).
If the flame is lost during operation, a maximum of 3 repetitions can be made.
If the flame is lost for the fourth time during operation, the burner will initiate lockout.
The repetition count is restarted each time controlled switching on by «R-W-SB» takes
place.
Preconditions for
startup
Undervoltage
Time supervision
oil preheater
Controlled intermittent
operation
Control sequence in
the event of fault
Resetting the
burner control
Ignition program with
LMO14.113B2 and
LMO24.113B2
Limitation of repetitions

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Operation, display, diagnosis
EK
7130z05/0700
Lockout reset button «EK...» is the key operating element for resetting
the burner control and for activating / deactivating the diagnostic func-
tions.
LED
7130z06e/0700
Red
Yellow
Green
The multicolor LED in the lockout reset button is the key indicating
element for both visual diagnostics and interface diagnostics.
Both «EK...» and LED are located under the transparent cover of the lockout reset
button.
There are 2 diagnostic choices:
1. Visual diagnostics: Operational status indication or diagnostics of the cause of
fault.
2. Interface diagnostics: With the help of the interface adapter OCI400 and PC soft-
ware ACS400 or flue gas analyzers of different makes (refer to Data Sheet 7614).
Visual diagnostics:
In normal operation, the different operational statuses are indicated in the form of color
codes according to the color code table. The interface diagnostics is activated by
pressing the lockout reset button for at least 3 seconds (refer to Data Sheet 7614). If,
by accident, the interface diagnostics has been activated, in which case the slightly red
light of the signal lamp LED flickers, it can be deactivated by pressing again the lockout
reset button for at least 3 seconds. The moment of switching over is indicated by a
yellow light pulse.
Operating position
EK
> 3 s
Interface diagnostics
PC / analyzer
7130z01e/0602
Visual diagnostics
xxxxxxx x
xxxxxxx x
xxxxxxx x
xxxxxxx x
xxxxxxx x
xxxxxxx x
Color code table
Operating position
During startup, status indication takes place according to the following table:
Color code table for multicolor signal lamp LED
Status Color code Color
Waiting time «tw», other waiting states ❍...................................... Off
Oil preheater on, waiting time «tw» ●....................................... Yellow
Ignition phase, ignition controlled ●❍●❍●❍●❍●❍Flashing yellow
Operation, flame o.k. ❏....................................... Green
Operation, flame not o.k. ❏❍❏❍❏❍❏❍❏❍Flashing green
Extraneous light on burner startup ❏s❏s❏s❏s❏Green-red
Undervoltage ●s●s●s●s●sYellow-red
Fault, alarm s....................................... Red
Error code output (refer to «Error code
table»)
s❍s❍s❍s❍Flashing red
Interface diagnostics ssssssssRed flicker light
...... Steady on sRed
❍Off ●Yellow
❏Green
Operation
Operational status
indication
Legend

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After lockout, the red fault signal lamp LED remains steady on.
In that condition, the visual diagnostics of the cause of fault according to the error code
table can be activated by pressing the lockout reset button for more than 3 seconds.
Pressing the reset button again for at least 3 seconds, the interface diagnostics will be
activated (for more detailed information, refer to Data Sheet 7614).
The following sequence activates the diagnostics of the cause of fault:
EK
> 3 s
Flashing
xxxx xxx x
xxxx xxx x
xxxx xxx x
xxxx xxx x
xxxx xxx x
xxxx xxx x
Error code table
EK
> 3 s
Interface diagnostics
PC / analyzer
OCI400
EK
< 3 s
7130z04e/0602
Reset
On
Visual diagnostics
Lockout position Lockout position Lockout position
Error code table
Red blink code of
signal lamp (LED)
«AL» at
term. 10
Possible cause
2 blinks
hh
On No establishment of flame at the end of «TSA»
- Faulty or soiled fuel valves
- Faulty or soiled flame detector
- Poor adjustment of burner, no fuel
- Faulty ignition equipment
3 blinks
hhh
On Free
4 blinks
hhhh
On Extraneous light on burner startup
5 blinks
hhhhh
On Free
6 blinks
hhhhhh
On Free
7 blinks
hhhhhhh
On Too many losses of flame during operation (limi-
tation of the number of repetitions)
- Faulty or soiled fuel valves
- Faulty or soiled flame detector
- Poor adjustment of burner
8 blinks
hhhhhhhh
On Time supervision oil preheater
9 blinks
hhhhhhhhh
On Free
10 blinks
hhhhhhhhhh
Off Wiring fault or internal fault, output contacts
During the time the cause of fault is diagnosed, the control outputs are deactivated.
- Burner remains shut down
- Fault status signal «AL» at terminal 10, according to the error code table
The diagnostics of the cause of fault is quit and the burner switched on again by reset-
ting the burner control. Press the lockout reset button for about 1 second (< 3 seconds).
Diagnostics of the
cause of fault

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Connection diagram and internal diagram LMO14... Control sequence LMO14...
126745
10 11 12
W
SB
R
L
N
MZBV1
AL
Si
83
OW
OH
N
83
QRB
QRC
br
bl sw
1
7130a01e/0700
9
EK2
EK1 µC control
K1 K2
K3
FSV
µC2
LED
kbr
µC1
R
W
SB
OH
OW
M
Z
BV1
FS
A´ AB C D
1
8
3
3
6
4
11
12
t1
t3
t3n
TSA
tw
Z
FS
6
11
12
7130d02e/1002
Only with LMO14.113B2: re-ignition t3n t3n
Connection diagram and internal diagram
LMO24.../LMO44...
Control sequence LMO24... / LMO44...
126745
10 11 12
W
SB
R
L
N
MZBV1
AL
Si
83
OW
OH
N
83
QRB
QRC
br
bl sw
1
7130a02e/0700
9
EK2
EK1 µC control
K1 K2
K3 K4
BV2
LED
kbr
FSV
µC2
µC1
R
W
SB
OH
OW
M
Z
BV2
FS
A´ AB C D
1
8
3
3
6
5
11
12
t1´
t3 t3n
TSA
tw
Only with LMO24.113B2: re-ignition
BV1 4
t4
t1
Z
FS
6
11
12
7130d03e/1102
t3n t3n
AL Alarm device OW Release contact of oil preheater
BV... Fuel valve OH Oil preheater
EK1 Lockout reset button QRB Photoresistive flame detector
EK2 Remote lockout reset button QRC Blue-flame detector
FS Flame signal bl = blue, br = brown, sw = black
FSV Flame signal amplifier R Control thermostat or pressurestat
K... Contacts of control relay SB Safety limit thermostat
kbr... Cable link (required only when no oil preheater is used) Si External primary fuse
LED 3-color signal lamp W Limit thermostat or pressure switch
M Burner motor Z Ignition transformer
TSA Ignition safety time
tw Waiting time t3 Preignition time
t1 Prepurge time t3n Postignition time
t1´ Purge time t4 Interval from flame signal to release «BV2»
A´ Start of startup sequence with burners using an «OH» C Operating position
A Start of startup sequence with burners using no «OH» D Controlled shutdown by «R»
B Time of flame establishment
Control signals µC1 Microcontroller 1
Required input signals µC2 Microcontroller 2
Perm. input signals
Legend

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Dimensions
Dimensions in mm
7,44
51,66
88,5
91
41,64
47,25
62,5
7130m02/0502
22
LMO14.111B2
LMO...
ã2002 Siemens Building Technologies
Subject to change!