Viessmann Vitomax HS M73 Operating And Service Instructions page 43

Adjusting the burner
Flame tube temperature monitoring (FTM)
In line with the requirements of EN 12953-3, flame
tube temperature monitoring (FTM) is necessary under
the following conditions:
■ Internal flame tube diameter for smooth pipes or
average flame tube diameter for corrugated pipes
> 1800 mm
Combustion heating output for fuel oil > 14 MW or for
■
natural gas > 18.2 MW
Type M73B and M73C
Boiler size
Nominal steam mass flow rate
Flame tube dimensions
Diameter
Smooth pipe, int.
■
7
Corrugated pipe, int.
■
7
Smooth pipe applica-
tion limit
Length
Reversing chamber
depth
Burner connections
Max. flame head
■
7
(optional wear-resist-
ant burner entry
point)
Max. flame head
■
7
(standard version)
Minimum flame head
■
length
Combustion chamber volume
(min. values)
Flame tube
■
Flame tube length and revers-
■
ing chamber depth
Pressure drop on the flue gas
side with natural gas
For operating pressure
With ECO 2
■
With ECO 1
■
Without ECO
■
Pressure drop on the flue gas
side with EL fuel oil
For operating pressure
With ECO 2
■
With ECO 1
■
The actual nominal steam mass flow rate may vary subject to the specific system.
*9
(cont.)
1
t/h 0.50
*9
d1 mm 468
d1 mm
―
bar 25
>
a mm 1350
b mm 250
c mm 240
c mm
e mm 315
m³ 0.24
m³ 0.29
5 bar mbar 3.2
23 bar mbar 3.7
5 bar mbar 3.2
23 bar mbar 3.6
5 bar mbar 3.3
23 bar mbar 3.9
5 bar mbar 3.0
23 bar mbar 3.5
5 bar mbar 2.9
Commissioning, inspection, maintenance
Furthermore, additional monitoring of the operating
conditions is required if the flame tube clearance diam-
eter for smooth pipes or the average flame tube diam-
eter for corrugated pipes is
2 3 4
0.70 1.00 1.30 1.65
508 556 581 631
― ― ―
25 25 25
> > > >
1500 1710 1910 2130
240 290 290 320
Adjusted subject to burner.
0.31 0.42 0.51 0.67
0.37 0.54 0.64 0.82
3.9 4.7 6.2 7.8
4.3 5.2 6.7 8.6
3.7 4.5 5.8 7.4
4.1 5.0 6.4 8.2
3.8 7.4 8.8 10.4
4.4 8.7 10.4 12.3
3.6 4.4 5.8 7.3
4.0 4.9 6.3 8.0
3.3 4.0 5.3 6.7
1433 mm.
>
5 6 7 8
2.00 2.50 3.20
656 706 756
750
― ― ―
25 25 25 22
> >
2325 2535 2800
500
370 370 420
360
0.79 0.99 1.26
0.95 1.19 1.48
9.0 9.0 10.3
10.0 10.0 11.4
8.5 8.9 10.1
9.4 9.8 11.1
9.9 10.6 12.5
11.6 12.5 14.8
8.4 8.4 9.7
9.4 9.3 10.7
7.6 8.0 9.1
9
4.00
806
800
20
3085
470
1.57
1.83
9.9
11.0
9.8
11.2
12.4
14.6
8.9
9.9
9.5
43