5
Operating manual
TROX air terminal units
Type VFC volume flow controllers
VFC
Locking screw
Rotary knob
Setting the set flow rate
Each VFC carries a characteristic to determine the setting
values on site (see example, nominal size 160).
min
settings below 3 results in an unregulated airflow
dependent on the duct pressure that is not less than
min-unit
.
Constant volume flow control, volume flow rate
setting with rotary knob
Characteristic for determining the volume flow rate
Constant volume flow rate operation
Volume flow rate setting values
Nominal size
l/s
m
3
/h
Value to be set
Value to be set
3
4
5
6
7
8
9
10
3
4
5
6
7
8
9
10
80
6
7
10
14
19
25
33
42
20
26
35
49
68
91
119 150
100
6
10
15
22
30
40
50
65
22
36
54
79
108 144 180 234
125
11
15
22
30
44
60
78
100
40
54
79
108 160 215 280 360
160
18
31
45
60
83
110 146 183
65
110 162 216 300 396 525 660
200
25
40
60
85
120 155 205 250
90
144 216 306 432 558 738 900
250
37
64
100 135 183 240 310 370
133 230 360 486 660 864 1116 1332
Set the set flow rate as follows:
•
Determine the setting value for the set flow rate from the
characteristic or the table below.
•
Unscrew the locking screw.
•
Move the pointer of the rotary knob to the setting value.
•
Tighten the locking screw.
Commissioning and wiring
60
100
65
50
38
100
150
200
250
300
350
392
VFC 160
18
40
80
120
140
185
160
180
100
200
300
400
500
550
450
350
250
150
666
600 650
3
4
5
6
7
8
9
10
l/s
cfm
m³/h
