Function
- SIEMENS LME21... control and safety unit
Connection diagram and control sequence of LME21...
K1
K2/1
K2/2
R / W
T
GP
AL
M
STB
H
Si
N
Always disconnect the power supply before installing or removing the control unit. Do not attempt to open or carry
out repairs on the control unit.
DANGER
AGK25... PTC resistor
AL
Error message (alarm)
V...
Fuel valve
CPI
Closed Position Indicator
DBR...
Wire link
EK
Lockout reset button (internal)
EK2
Remote lockout reset button
ION
Ionization probe
FS
Flame signal
FSV
Flame signal amplifier
GP
Pressure switch
H
Main switch
HS
Auxiliary contactor, relay
K1...4
Internal relays
KL
Low-fire
LK
Air damper
Status
Waiting time «tw», other waiting states
Ignition phase, ignition controlled
Operation, flame o.k.
Operation, flame not o.k.
Extraneous light on burner startup
Undervoltage
Fault, alarm
Error code output (refer to «Error code
table»)
Interface diagnostics
Legend: ....... Steady on
Function
- Control panel
420010962200
RESET
K3
K4
LP
Z
V2
V1
EK2
7101a22e/0609
LKP
Air damper position
LP
Air pressure switch
LR
Load controller
M
Fan motor
R
Control thermostat /
pressurestat
STB
Safety limit thermostat
Si
External pre-fuse
t
Time
W
Limit thermostat / pressure
switch
Z
Ignition transformer
ZV
Pilot gas valve
A
Start command (switching on
by «R»)
B-B´
Interval for establishment of
Color code table for multicolor signal lamp (LED)
Color code
❍ ...................................................................................
● ❍ ● ❍ ● ❍ ● ❍ ● ❍ ● ❍ ● ❍ ● ❍ ● ❍ ● ❍ ● ❍
❑...................................................................................
❑ ❍ ❑ ❍ ❑ ❍ ❑ ❍ ❑ ❍ ❑ ❍ ❑ ❍ ❑ ❍ ❑ ❍ ❑ ❍ ❑ ❍
❑ ▲ ❑ ▲ ❑ ▲ ❑ ▲ ❑ ▲ ❑ ▲ ❑ ▲ ❑ ▲ ❑ ▲ ❑ ▲ ❑ ▲
● ▲ ● ▲ ● ▲ ● ▲ ● ▲ ● ▲ ● ▲ ● ▲ ● ▲ ● ▲ ● ▲
▲...................................................................................
▲ ❍
▲ ❍
▲
▲
▲
▲
❑
Red
2
3
0
4
I
1
A
SB / R
W / GP
AL
M
Z
V1
(LR) V2
LP
FS
t10
t1
tw
▲ ❍
▲ ❍
▲ ❍
▲ ❍
▲ ❍
▲
▲
▲
▲
▲
▲
▲
▲
❍
Green
Off
1 - reset key
2 - working lamp
3 - main switch I / O
4 - fuse
B
B´
C
t3
t3n
t4
7101d05/0409
TSA
flame
C
Operating position of burner
reached
C-D
Burner operation (generation
of heat)
D
Controlled shutdown by «R»
t1
Prepurge time
t3
Preignition time
t3n
Postignition time
t4
Interval between ignition
«Off» and release of «V2»
t10
Specified time for air pressure
signal
TSA
Ignition safety time
tw
Waiting time
Color
Off
Flashing yellow
Green
Flashing green
Green-red
Yellow-red
Red
▲ ❍
Flashing red
▲
Red flicker light
●
Yellow
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EN
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