User Manual

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Siemens VAV modular controller ASV181.1E/3 CE1N3545en
Building Technologies 2019-03-21
CAV step mode: CLOSE /
min
V

/
mid
V

/
max
V

/ OPEN
CAV step mode (Type “STP”)
YC
<1 V →
min
V

open →
mid
V

>9 V →
max
V

Y1
open
G0
G0
open
Y2
open
open
G0
G0
Action
CAV step mode
Dir r → rotation CW
Dir L → rotation CCW
“Damper fully open“
CAV step mode
Dir r → rotation CCW
Dir L → rotation CW
“Damper fully closed“
Setting
min
V

≤ 0 drives the actuator to position “fully closed”.
G Y2 Y1 YC
U
G0
N1
AC 24 V
G
G0
3544A14
max
V

min
V

mid
V

N1 ASV181.1E/3 or G..B181.1E/3
Ordering through the VAV box manufacturer (OEM)
As a rule, documentation provided by VAV box manufacturers (OEM) contains
detailed information on VAV modular controller ordering.
The OEM generally configures and assembles VAV modular controllers as VAV
box units. This facilitates commissioning at the construction site considerably.
Should changes be necessary, the use of PC software for service ACS941
(download free of charge at www.siemens.com/openair) and interface converter
AST11 is recommended.
OEM always sets
n
V

(characteristic value for nominal air volume flow) as a
matter of principle.
For configuration for operating mode “3P”, supply and extract air volume
controllers are each connected to separate 3P outputs and DC 0/2…10 V inputs of
a suitable DDC room controller, e.g. RXC31.1.
When “con” is configured, a differentiation is to be made as to how VAV modular
controllers are wired in relation to the relevant controller:
In the case of parallel control, the controller controls all VAV modular controllers
in a star-like (parallel) manner. I.e., the DC 0/2…10 V output signal is the reference
variable for all VAV modular controllers. The OEM adjusts the minimum and
maximum air volume flow limit values
min
V

and
max
V

individually on each
controller.
Parallel control is in particular suitable to design large rooms with several air
volume controllers.
Operating mode “STP”
Note
Configuration for
operating mode “3P”
Configuration for
operating mode “con”