Siemens LME21.350A1 - Page 20

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Building Technologies CC1N7101en
HVAC Products 27.11.2008
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 burn-
ers. Controlled prepurging «t1» with nominal load air volume.
For information about actuators «SA»:
SQN3...: Refer to Data Sheet N7808
SQN7...: Refer to Data Sheet N7804
SQN9...: Refer to Data Sheet N7806
4
9
5
LR
SA
L
SB/R/W
BV1
RV
BV2
7101a13/0804
12
12 2
10
83
6
11
9
57
41
GP/SB
R/W
AL
EK2
M
LP
LR
Z
BV1
ION
HS
0
I
N
L
6810
21
3
7
9
RV
LK
SA
R1
K2
R3
C2
K1
+
D
-
+
R2
C1
I
MS
C3
III
II
KL
Zu
III
LKP
NL
t1
III
t
I
II
t4
TSA
12
2
10 8
3611
9
7
4
5
1
HS
0
I
N
L
EK2
M
LP
GP
R/W
Z
BV1
LR
ION
AL
N
18
2
75
6
3
49
B
b1
b2
A
a1
a2
I
M
II III V
5
LK
RV
1)
7101a14/0606
S1)
BV2
2)
SB
*
*
R3
R1
Si
Si
LME22... LME22...
SQN3...151... or SQN3...251...
* Note
With 2-stage modulating burners (with gas regulation
damper «RV»), «BV2» and the dotted connection be-
tween terminals (*) are not required.
SQN90.220... / 2-stage modulating control
LKP
zu
KL
NL
t
III
III
IVIV
I
I
II
t1
TSA
t4
N
I
HS
L
R/W
GP/SB
12
EK2
38
Z
LR
5
ION
BV1
BV2
0
7101a15/0606
B
C
A
a1
b1
c1
b2
a2
M
7
9
102
N
5
4
1
3
2
8
6
7
IIIII IVI
6 11
AL
4 1
M
LP
4
N15
N
I
HS
L
A
b1
a1
R/W
GP/SB
12
AL
EK2
3
8
3
268 7
b2
a2
M
B
Z
LR
ION
BV1
4
1
0
12
10
9
5
7
BV2
IIIIIIIV
2
6
11
LP
M
Si
Si
LME22... LME22...
SQN7...454 / 2-stage control
1 wire control
SQN7...424 / 2-stage control
2 wire control