Application Examples - Siemens LME SERIES Installation Manuals

Application examples

The suitable wiring schemes are merely examples which must be verified in the individual case depending on
application!
Control of actuators of 2-stage or 2-stage modulating
burners. Controlled prepurging «t1» with low-fire air
volume. Same low-fire actuator position during
startup and operation.
For information about actuators «SA»:
SQN3...: Refer to Data Sheet N7808
SQN7...: Refer to Data Sheet N7804
SQN9...: Refer to Data Sheet N7806
LME21...
12 2 10 8 3 6
EK2
LP
M
AL
HS
N 1
2
0 I
Si
b1 b2
N L
III
a b
a3
II
I
MS
a b
a b
SQN3...121... / 2-stage control
* Note
With 2-stage modulating burners (with gas regulation
damper «RV»), «BV2» and the dotted connection be-
tween terminals (*) are not required.
LME21...
12
2 10 8
EK2
AL
HS
N 8 4
0 I
Si
N L
a1
A
B
SQN7...244 / 2-stage control
18/25
Building Technologies
HVAC Products
11 9 7 4 5 1
(*)
ION
Z
BV1
GP/SB
LR
R/W
BV2
(*)
*
6 7 5 4 3
B
IV
a b
A
RV
a2
V
a b
LK
3 6 11 7 4 5
LP
Z
GP/
M
SB BV1
LR
R/W
BV2
1 5 3 2 7 6
b2
c1
b1 a2
C
M
I II III IV
HS
0 I
N L
LKP
t1
I
NL
IV
IV
KL IV
III
III
Zu
t
II
SA
1
ION
LKP
I I
NL
IV IV
III
KL
III
zu
II
t1
TSA
t4
5 12 4
7101a09/0705
LR SA
SB/R/W
BV1
L
LME21...
10 6 11
12 2 8 3 9
EK2
LP
M
AL
GP/
SB
R/W
N N 1 2
Si
K2
+
IV
b
a
D
- +
C3
II
I
MS
a b a b
SQN91.140... / 2-stage control
t
RV
BV2
4
7 5 1
ION
Z
BV1
LR
BV2
5 3 6 4
III
a b
K1
C31
V
R1
R32 a b
LK
CC1N7101en
27.11.2008