Viessmann Vitomax HS M73 Operating And Service Instructions page 42

Commissioning, inspection, maintenance
Adjusting the burner
Calculating factor f
0.765
0.755
0.745
0.735
0.725
0.715
0.705
0.695
0.685
0.675
5 6 7 8
Operating pressure in bar
Fig. 17 M75C
A With ECO 2
With ECO 1
B
Without ECO
C
Calculating the combustion heating output
Combustion heating output in kW = factor f x nominal steam mass flow rate in kg/h
Example:
Nominal steam 10,000 kg/h M75C
mass flow rate
Operating pressure
42
(cont.)
9 10 11 12 13 14
1. Operation with ECO 2
Factor f = 0.689 results in combustion heating output = 6890 kW, curve
11 bar
at 11 bar
2. Operation with ECO 1
Factor f = 0.702 results in combustion heating output = 7020 kW, curve
at 11 bar
3. Operation without ECO
Factor f = 0.745 results in combustion heating output = 7450 kW, curve
at 11 bar
15 16 17 18 19 20
C
B
A
21 22 23 24
A
B
C