Siemens LMO44.255C2 User Manual

4/13
Building Technologies Division CC1N7130en
Infrastructure & Cities Sector 22.08.2013
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. Burner controls LMO... are
designed in black plastic.
The housing accommodates the
- microcontroller for the control sequence and the print relays for load control
- electronic flame signal amplifier
- lockout reset button with its integrated multicolor signal lamp (LED) for operational
status and fault status messages and the socket for connecting the OCI400
interface or the AGK20... lockout reset button extension
- Multicolor indication of operational status and fault status messages
- Transmission of operational status and fault status messages and detailed service
information via additional OCI400 interface and ACS400 / ACS410 PC software
Type summary
Type reference Mains
voltage
Fuel
valve
stages
Burner
capacity
¹) Remote
reset
Times Comparable type of
LOA...
4
)
tw
max.
t1 / t1´
min.
TSA
max.
t3
min.
t3n
max.
t4
min.
Standard versions
LMO14.111C2 AC 230 V 1 <30 kg/h x x 2.5 s 15 / 16 s 10 s 15 s 10 s --- LOA24.171B27
LOA26.171B27 ²)
LOA36.171A27 ²)
LMO14.113C2
AC 230 V
1
<30 kg/h
x x
2.5 s
15 / 16 s
10 s
15 s
3 s
---
LOA24.173A27 ³)
LMO24.111C2 AC 230 V 2 <30 kg/h x x 2.5 s 15 / 16 s 10 s 15 s 10 s 15 s LOA24.171B27
LOA26.171B27 ²)
LOA36.171A27 ²)
LMO24.111C1
AC 120 V
2
<30 kg/h
x x
2.5 s
15 / 16 s
10 s
15 s
10 s
15 s
LOA24.171B17
LMO24.255C2
AC 230 V
2
</> 30 kg/h
x x
2.5 s
25 / 26 s
5 s
25 s
5 s
15 s
---
Version for flash-steam generators
LMO24.011C2
AC 230 V
2
<30 kg/h
x x
2.5 s
5 / 6 s
10 s
5 s
10 s
15 s
LOA24.571C27
Suited for direct-fired air heaters
LMO44.255C2
AC 230 V
2
</> 30kg/h
x x
2.5 s
25 / 26 s
5 s
25 s
5 s
5 s
LOA44.252A27
TSA
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 fuel valve 2 (BV2)
¹)
Bridging contact for oil preheater
²)
No actuator (SA) function
³)
In case of replacement, ignition transformer must be rewired from terminal 7
(LOA...) to terminal 6 (LMO...)
4)
LMO... can replace LOA..., but the instructions given in the Data Sheet, other
technical documentation and the specification must be followed
Indication and
diagnostics
Legend

Siemens LMO44.255C2 Specifications

General

Brand	Siemens
Model	LMO44.255C2
Category	Control Unit
Language	English