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1. General Characteristics
The V F boiler is set in the Factory to operate
on Natural Gas Group H with a supply pressure of 20mBar.
For higher gas pressure up to 300mBar, a filter and
a pressure regulator must precede the V F gas valve.
1.1. Acceptable gas pressure
Gaz naturel H
G20
Nominal (mbar) 20
Minimum (mbar) 17
Maximum (mbar) 25
1.2. Combustion conditions
VF
40 60 80 100
Nominal output Pn (80/60°C) kW 56,5 92,6
Nominal condensing output P (50/30°C) kW 61,8 100
Nominal heat outflow Qn kW 58 95,1
Minimum heat outflow Qmin kW 14,5 25,5
G20 gas flow rate at Pn m3/h 6,1 10,1
Recommended CO2 values % see chapter 6.2
Mass flow of flue gases Qn / Qmin (80/60°C) g/s 27 / 6,1 44 / 12
Mass flow of flue gases Qn / Qmin (50/30°C) g/s 25,3 / 5,7 39,6 / 10,4
Temperature of flue gases Qn / Qmin (80/60°C) °C 70 / 55 76 / 60
Temperature of flue gases Qn / Qmin (50/30°C) °C 46 / 32 56 / 32
Pressure loss for flue gas circuit Qn Pa 75 74
Diameter of flue gas outlet mm80 100
Maximum pressure at flue gas output (B23P)
Qn / Qmin (80/60°C) * Pa 150 / 8 110 / 6
Maximum pressure at flue gas outlet (B23P)
Qn / Qmin (50/30°C) * Pa 123 / 3 97 / 5
Combustion air at Qn m3/h 76 124
NOx class to EN 483:2000 4 / 5 5 / 5
Types of flue gas and combustion air arrangements
B23, B23P, C13, C33, C53
