18/25
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
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
4
12
5
LR
SA
Au
f /
Z
u
L
SB/R/W
BV1
RV
BV2
7101a09/0705
12
2
10
8
3
6
11
9
7
4
5
1
HS
0
I
N L
AL
EK2
M
LP
GP/SB
R/W
Z
BV1
(*)
LR
ION
BV2
*
(*)
N
1
2
6
7
5
4
3
b1
b2
B
a
b
III
a3
a b
II
MS
I
a b
a2
a
b
IV
A
a b
V
RV
LK
7101a10
/0
6
0
6
12
2
10
8
3
6
11
7
4
5
1
AL
EK2
M
LP
GP/
SB
R/W
Z
BV1
LR
ION
BV2
HS
N
L
0
I
N
N
1
2
5
3
6
4
LK
SA
IV
II
MS
I
C3
D
K2
C31
III
R32
R1
V
K1
a
b
a b
a b
b
a
a b
-
+
+
9
II
KL
Zu
III
LKP
NL
t1
IV
III
IV
I
t
IV
Si
Si
LME21...
LME21...
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.
SQN91.140... / 2-stage control
1
b1
LP
HS
8
N
4
N
I
L
B
a1
A
12
EK2
AL
2
10
3
5
3
2
7
6
b2
a2
M
c1
C
R/W
GP/
SB
6
11
4
ION
5
1
0
71
01a
11/
06
06
8
III
II
IV
I
Z
BV1
LR
7
BV2
M
I
KL
zu
NL
LKP
t
I
III
III
IV
IV
II
TSA
t4
t1
Si
LME21...
SQN7...244 / 2-stage control
