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Siemens
VAV compact controller KNX/PL-Link G..B181.1E/KN
CE1P3547en
Building Technologies
2017-03-23
The VAV Compact Controllers can be operated in CAV mode by setting the
setpoint value accordingly, i.e. setting the supervisory controller to send a constant
setpoint.
VAV Compact Controllers can also be operated as damper actuators, i.e. the
0...100% setpoint is interpreted as position setpoint, cf. section
Fehler!
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5.1.2 Calculation
formulas
The parameters are based on the following formulas:
Pa
Δp
Pa
300
V
n
n
<
300 Pa is the upper limit of the operating range of the differential pressure sensor.
The nominal pressure is the differential pressure in the VAV box at a given nominal
volume flow, determined by the OEM specification, cf. also section
2.6
.
Ζ ∴
Ζ ∴
Ζ ∴
Ζ ∴
%
/h
3
m
/h
3
m
%
100
flow
volume
nom.
flow
volume
min.
V
min
√
<
Ζ ∴
Ζ ∴
Ζ ∴
Ζ ∴
%
/h
3
m
/h
3
m
%
100
flow
volume
nom.
flow
volume
max.
V
max
√
<
Ζ ∴
Ζ ∴
∋
(
Ζ ∴
Ζ ∴
Ζ ∴
%
%
%
%
V
100
V
V
Setpoint
value
Actual
min
min
max
%
∗
,
√
<
Ζ ∴
∋ (
Ζ ∴
Ζ ∴
Ζ ∴
Pa
%
%
300
p
Vn
100
p
FLW
Pa
Χ
√
√
<
Χ
<
f
Ζ ∴
∋
(
Ζ ∴
Ζ ∴
2
Vn
100
FLW
300
FLW
p
%
Pa
Pa
⌡
∑
√
√
<
<
Χ
f
Constant air volume
control (CAV)
Position control
Calculation of Vn
(
Χ
p
n
= nominal pressure)
Min. and max. values
Actual value as function
of setpoint and min. /
max. limits
Actual value as function
of differential pressure
Differential pressure as
function of actual value