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must be set to completely ignite this amount of fuel. A too long ignition time will burn the whole amount of fuel
and the flame will go out.
Burning
During the burning phase, the burner can be operated in two modes: with a variable output regulation called
PID control, and two-stage control (PID disabled). In the first option, it is possible to overheat the boiler by 8 C,
especially when the installation is chilled. However, after heating the installation, the burner operation
parameters will adjust to the amount of heat received and the temperature change in the boiler should be
gradually reduced. In this operation mode, the controller tries to match the burner output to heat demand by
changing the burner output with an accuracy of 1%. The burner operates in very long cycles and in a properly
made installation it can operate without being turned off, changing the output according to heat demand.
In the burning mode with the two-stage control, the burner works at maximum output until the set temperature
of the boiler is exceeded by 1/2 hysteresis of the burner. Then, it is switched to minimum output. During winter,
such activity should decrease the temperature in the boiler and switch the burner back to maximum output.
Where there is insufficient take-off and the temperature in the boiler increases, even when the burner operates
at minimum output, it will be switched to the feeding mode when the boiler temperature exceeds the set
hysteresis value. The burner will be turned off if the temperature increases further. When the set temperature is
exceeded by a value of 2x hysteresis, the hysteresis will turn off the burner.
Set the parameters of the burner to values that allow for proper operation for about 20% of rated power of the
burner. The following parameters are available:
1. Feeder operation time
- fuel feed time in seconds, after feeding a portion the feeder stops for a time
described below. Set only the feeder operation parameters. The burner feeder turns on simultaneously with the
dispenser feeder, but operates for a longer period. The exact time of the feeder operation is set by the Service by
determining the elongation of the feeder operation time in %.
2. Feeder standby time
- the feeder operates in the operation/standby cycle. It is recommended to use a short
feeder operation time and adjust the amount of fuel by changing the standby time.
3. Fan output
- fan output should provide for an optimum amount of air required for fuel burning.
This parameter needs to be set when the PID option is turned on (see PID). The parameters are the same as in
the above item, but they must be chosen so that the burner produced about 50% of rated power.
Note: If the PID is turned off, the AVERAGE OUTPUT option will be displayed in the menu.
The set of parameters are the same as for MINIMUM OUTPUT. However, they should produce 100% of rated
power.
Minimum output
Average output
Maximum output
