Rated heating output
kW
390
530
720
950
1250
Max. power consumption
Ignition unit
W
1600
1600
1600
1600
1600
Electrical connections (total)
W
6340
8420
8420
10920
11920
During heating operation
W
2880
3570
4560
5170
6790
Feed screw conveyor
W
1100
1500
1500
2200
2200
Primary air fan 1
W
220
250
250
550
550
Primary air fan 2
W
550
550
550
550
550
Primary air fan 3
W
900
900
900
900
900
Secondary air fan
W
550
1500
1500
1850
1850
Flue gas fan
W
1500
2200
2200
3000
4000
Grate drive
W
120
120
120
120
120
Electrical power consumption at Q
N
W
2880
3570
4560
5170
6790
Electrical power consumption at Q
min
W
2340
2900
3710
4150
5470
Boiler connections
Boiler flow
DN
100
100
100
125
125
Boiler return
DN
100
100
100
125
125
Extinguishing water connection
R
¾
¾
¾
¾
¾
Boiler drain valve
R
1
1
1½
2
2
Safety heat exchanger
Cold water
R
2 x ½
2 x ½
4 x ½
4 x ½
4 x ½
DHW
R
2 x ½
2 x ½
4 x ½
4 x ½
4 x ½
Sensor well for thermally activated safety
valve (TS)
RP
½
½
2 x ½
2 x ½
2 x ½
Flue gas
*6
Average temperature (gross
*7
)
Average flue gas temperature at Q
N
*8
°C
160
160
160
160
160
Average flue gas temperature at Q
min
°C
120
120
120
120
120
Mass flow rate
Q
N
, M5, O
2
6 %
g/s
289.4
393.2
534.2
704.8
927.4
Q
N
, M45, O
2
8 %
g/s
348.1
473.1
642.7
848.0
1115.8
Flow rate
Q
N
, M5, O
2
6 %, 150 °C
m
3
/s
0.32
0.43
0.59
0.78
1.02
Q
N
, M45, O
2
8 %, 150 °C
m
3
/s
0.40
0.54
0.74
0.98
1.29
Flue outlet
7
mm
350
350
350
400
450
Required draught
– Required at full load
Pa
5
5
5
5
5
mbar
0.05
0.05
0.05
0.05
0.05
Max. permissible draught
*9
Pa
10
10
10
10
10
mbar
0.1
0.1
0.1
0.1
0.1
Efficiency
– Full load
*10
%
94.8
93.8
92.8
91
91
– Partial load
%
92.9
93.1
93.3
90
90
CE designation
in accordance with the Machi-
nery Directive
CE
CE
CE
CE
CE
Boiler category to EN 303-5
5
5
5
3
3
*6
Values for calculating the size of the flue system to EN 13384, based on 12 % O
2
.
*7
Actual flue gas temperature as average gross value in line with EN 304 at 20 °C combustion air temperature, based on 12 % O
2
.
*8
Flue gas temperature: Reduction possible by employing the displacer rods (Q
N
-20 °C; Q
min
- 10 °C)
*9
In chimneys with a draught (chimney draught) above 0.15 mbar, a secondary air device (draught limiter) must be installed.
*10
Lower for dry fuel (M5-M20) without recirculation.
Lower for Vitoflex 300-UF, 720 to 1250 kW without displacer rods
Vitoflex 300-UF
(cont.)
VITOFLEX 300-UF
Viesmann
15
5682428
2