Viessmann Vitoflex 300-UF Series Installation And Operating Instructions Manual page 45

Vitoflex 300-UF Installation & Operating
Fuel
(continued)
Parameter
"Delay, O , heat-up"
2
"Cycle, maintaining"
Left entry field
"Cycle, emergency mode"
Right entry field
"Minimum cycle, feed screw
conveyor"
Left entry field
"Maximum cycle, feed screw
conveyor"
Right entry field
"Limit temperature, feed pipe"
"Firebed/delay"
"Firebed/cycle ramp"
Description
Length of time for which ignition is monitored in the
"Ignition" operating state
The boiler switches to the "Load" operating state if the
O value drops below 15% during this set time.
2
Setting in seconds
Cycle time in the "Maintaining", "Standby" and
"Burnout" operating states
The feed screw conveyor runs until the feed system is
empty.
Setting is a % of the system's inherent maximum cycle
time for fuel feed
Cycle time in the "Emergency burnout" operating state
Setting is a % of the system's inherent maximum cycle
time for fuel feed
Lower cycle time limit in the "Load" and "Burnout"
operating states
If a value greater than the maximum cycle for the feed
screw conveyor has been entered, the controller
automatically changes to a value 1 % below the
maximum cycle.
Setting is a % of the system's inherent maximum cycle
time for fuel feed
Upper cycle time limit in the "Load" and "Burnout"
operating states
Setting is a % of the system's inherent maximum cycle
time for fuel feed
Feed temperature at which safety measures are initiated.
If the temperature at the feed pipe reaches the selected
temperature limit, the warning message "Feed warm" is
displayed. If the temperature at the feed pipe continues
to rise, a fault message is displayed and the feed is
switched on to move fuel into the combustion chamber.
Setting in °C
Switching delay for firebed monitoring in the combustion
chamber. After the firebed light barrier has triggered in
the combustion chamber, the fuel feed stops after the
set time has elapsed.
Setting in seconds
After the firebed light barrier has triggered in the
combustion chamber, the feed cycle is ramped down
in steps of 0.5% each. The cycle continues to be
ramped down until 50% of the current cycle is reached.
"Firebed/cycle ramp" is used to set the interval between
each rampdown step.
Setting in seconds
"Feed" tab
(continued)
Parameter
Setting Standard
range value:
10 to 300 90
0.1 to 10 5
1 to 100 30
0 to 99 20
1 to 100 100
20 to 90 70
10 to 600 100
10 to 600 20
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