Flue Gas Fan - Viessmann Vitoflex 300-UF Series Installation And Operating Instructions Manual

Parameter

Flue Gas Fan

Parameter
"Flue gas temperature, burnout
- OFF"
"Delay, burnout - OFF"
"Vacuum pressure, full load"
"Vacuum pressure, partial load"
"Current set value"
54
Description
A low flue gas temperature is a clear sign for there being
no longer any firebed in the combustion chamber. If the
flue gas temperature drops below this value, the control
system switches from the "Emergency burnout"
operating state to the "Off" operating state.
Setting in °C
Delay before changeover of operating state when "Flue
gas temperature, burnout - OFF" is reached
Settings in minutes
Vacuum pressure in the combustion chamber at full load,
upper control limit
Setting in Pa
Vacuum pressure in the combustion chamber at partial
load, lower control limit
Setting in Pa
Displays the sliding set value for vacuum pressure in the combustion chamber in Pa
Vitoflex 300-UF Installation & Operating
"Settings" tab
To keep dust emissions low, the vacuum pressure inside
the combustion chamber should be as constant as
possible. Pressure fluctuations inside the combustion
chamber are the result of a changing volume of fire.
The pressure fluctuations can be balanced out by
changing the rotational speed of the flue gas fan.
The set value for the vacuum pressure ("Current set
value") is calculated by the control unit as a function of
the heating output. When doing so, the "Vacuum
pressure, partial load" and "Vacuum pressure, full load"
limits cannot be exceeded.
"Controller" tab
The vacuum pressure in the boiler's combustion chamber
is regulated by the flue gas fan. The set value is set
automatically as a function of boiler output.
Parameter Setting range
"P factor"
"I factor"
"D factor"
"Cycle time" 1000 to 15000
Setting Standard
range value:
50 to 150
10 to 60
50 to 120
30 to 80
Standard value:
1 to 100 50
0 to 100 0
1 to 100 50
5000
70
10
80
50