Pressure loss in ducts. T
otal pressure.
Volume flow rate
E = Extract air fan
S = Supply air fan
E = Extract air fan
S = Supply air fan
Pressure loss in ducts. T
otal pressure.
Volume flow rate
Volume
flow rate
ED and SD are examples of pressure
losses in supply and extract ducts
SFE 2.5 kW/m
3
/s
1
2
3
4
5
6
7
8
E
E
E
E
E
E
E
E
S
S
S
S
S
S
S
S
dm
3
/s
m
3
/h
10
20
30
40
50
60
70
80
90
100
50
110
130
100
150
200
250
300
400
450
500
120
350
100
50
150
200
250
300
350
0
At a lower total pressure, SFP
will be smaller at this speed.
100
50
150
200
250
300
350
ED
dm 3/s
m3/h
10
1
2
20
30
40
50
60
70
80
3
4
5
6
7
0
90
100
50
8
110
120
130
100
150
200
250
300
350
400
450
500
ED is an example of pressure
loss in extract ducts
© VALLOX • We reserve the right to make changes without prior notification.
Air flows/DIGIT2 SE (electric radiator unit, winter setting)
Extract air flow during heat recovery bypass (summer setting)
Measuring points after the connection
outlet. Fan curves indicate the total
pressure available for duct losses.
VALLOX DIGIT2 SE/VKL/MLV
PERFORMANCE
3
1
2
3
4
5
6
7
8
Fan speeds
Fan input
power
W
60
80
100
120
140
160
180
230
42
67
97
130
167
205
242
315
Control
voltage
(V)
Air flows/DIGIT2 SE VKL (liquid radiator unit, winter setting)
NOTE!
When the system is being
adjusted, post-heating must be
selected (winter setting).
Air flow measurement outlets
The fixed air flow measurement outlets
are located behind the cover plate.
You can measure the total pressure of
the supply and extract air ductwork at
the measurement outlets using a
pressure gauge.
Compare the pressure readings with the
air volume curves to see unit air flows
at various adjustment positions.
The red measurement hose gives the
pressure reading for the supply air
ductwork and the black hose the
pressure reading for the extract air
ductwork. Observe unit model and
setting (summer or winter).
SFP (Specific Fan Power)
guideline value < 2.5 (kW/m
3
/s) SFP = Air flow (max.) (dm
3
/s)
Input power (total) (W)
ED and SD are examples of pressure
losses in supply and extract ducts
SFP (Specific Fan Power)
guideline value < 2.5 (kW/m
3
/s)
Supply air
Extract air
S
E
SD
ED
100
50
150
200
250
300
350
10
20
30
40
50
60
70
80
0
90
100
50
8E
7E
6E
5E
4E
3E
2E
1E
110
120 130
400
450
500
5S
8S
7S
6S
4S
3S
2S
1S
At a lower total pressure, SFP
will be smaller at this speed.
SFP 2.5 kW/m
3
/s
dm
3
/s
m
3
/h
SD
ED
100
150
200
250
300
350
RECOMMENDED
OPERATING RANGE
RECOMMENDED
OPERATING RANGE
RECOMMENDED
OPERATING RANGE
