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Example of calculating the heat output of the burner:
•
Determine the amount of fuel supplied per hour - m
fuel
= 5.3 kg / hr.
Calculate the instantaneous amount of supplied fuel m'
fuel
:
m'
fuel
=
M
fuel
(kg/h)
=
0,001472 kg/s
3600 (s)
•
Take into account fuel efficiency –e.g. wood pellets have a calorific value
H
fuel
= 17,2 MJ/kg = 17200 kJ/kg.
In case of another unit of fuel efficiency it is more convenient to apply - kWh / kg, and the calculation is
as follows: normal wood pellets have calorific value of 4.77 kWh / kg (equivalent to 17.2 MJ / kg);
•
Take into account the efficiency
η
system
= 89 %=0,89.
•
Calculate the input of boiler:
P
heat consumption
=
η
system
* H
fuel
* m'
fuel
= 0,89 * 17200 * 0,001472 = 22,5 kW,
if the unit MJ / kg is used for the calorific value of the fuel.
If the fuel efficiency is indicated in kWh / kg, then the calculation is as follows:
P
heat consumption
=
η
system
* H
fuel
* m
fuel
= 0,89 * 4,77 * 5,3 = 22,5 kW.
•
The same formula should be used for the calculation of the burner output in the case where the calorific
value of the fuel differs from the value as described above or the required output of burner is lower than
nominal;
Fault statuses of burner
The fault status is signalled by LEDs on the control module. A detailed description of the faults and their
removal can be found in Tab. no. 9.
After the fault removal, restart the burner by means of switching off and on the switch "START OF BURNER"
on the control box of boiler (see Fig no. 2).
Tab. no. 9
Indication of fault statuses by means of LEDs
No. Indication
Importance
Removal of fault
1.
Yellow LED
is always alight
Has been reached maximum
number of attempts to ignite and
ignition of the fuel failed
Check the reasons why the fuel could not be
ignited.
Check the cause of problems with the ignition
2.
fast blinking yellow
LED
High intensity of light sensing
that exceeds the settings or a
short circuit of the photosensor
Check the potentiometer that controls the
sensitivity adjustment of the photosensor - repair
should be performed only by an authorized
technician
3.
Green LED
is always alight
Operating signal of photosensor
disappeared during the regime
of combustion
Check and clean the photosensor; if necessary,
call the service for assistance.
Failed ignition of the fuel
Check the reasons
4.
fast blinking red
LED
Sensor of fan speed sensor
(Hall sensor) is not connected
correctly or the fan is
functionless
The assistance of the service is required, but this
only can be performed by an authorized technician
5.
Yellow and green
LED is always alight
Motor of fuel feeder is
disconnected or functionless
Check if there is not disconnect the supply cable of
fuel feeder from the main unit of burner. Check the
status and functionality of the feeder
Operating relay of the control
panel is defective
The assistance of the service is required, but this
only can be performed by an authorized technician
ATTENTION:
In case of boiler overheating the safety thermostat is activated. This thermostat must be manually reset and
can be switched on again after the temperature drops below the set value. We have to unscrew the black cap
of the safety thermostat and then press the button by using a suitable tool. In case of repeated shutdown of
the safety thermostat the boiler must be shut down and the cause of repeated overheating of the boiler must
be found out. Once you have checked the boiler and burner and you have determined and repaired the cause
of overheating, restart the burner by switching off the power supply and its subsequent switching on.
In case of activation of thermal sensor against penetration of combusted fuel the fuel feeder is turned off and
the burner becomes extinct. Once the cause of high temperature on the knee of burner has been determined
we reset the fault by switching off and switching on the burner. In the event of damage to the sensor this must
be replaced by a service worker.
