Fondital GIAVA KRB 12, Руководство по установке, использованию и техническому обслуживанию, Страница: 44 / 68

44
fig. 23 fig. 24
A
3.2.6. Checking combustion efficiency
3.2.6.1. Flue cleaning function
The boiler features a flue cleaning function which must be used to measure combustion efficiency during operation and to adjust the burner.
To enable the flue cleaning function, press the "reset" key and it keep it pressed for about three seconds.
If the "reset" key is released before the three seconds have lapsed, the boiler continues to operate normally.
The "broom" symbol steady on and the fan speed indicate that the flue cleaning function is active.
The display shows the flow temperature and the lit flame on, if burner is on. The boiler performs the ignition sequence and then operates at the
burner maximum output (parameter P4). The keys active in this function are: “reset” and ““DHW + and -””.
By pressing the “DHW + and -” key it is possible to change the fan speed from P5 (minimum speed) to P4 (maximum speed). The display shows the
wrench symbol (indicating that the parameter is being edited), the broom, the H letter (indicating Hertz), the speed set-point value in Hz, the fan
current speed, and the lit flame on symbol if burner is on.
As soon as the “DHW + and -” key is released again, the display will show fan current rpm value, flow temperature, system pressure, the lit flame on
symbol, the "broom" symbol to indicate that the flue cleaning function is active.
The flue cleaning function lasts 15 minutes. To quit this function, press "reset" and you will go back to the standard operating mode.
3.2.6.2. Measurement procedure
The boiler is equipped with a tower allowing for air intake/flue gas venting pipe connection (fig. 23 and 24).
The tower is designed with two pre-arranged openings directly accessing air and flue gas ducts (fig. 23).
Remove caps A and B from the pre-arranged openings on the tower, before starting combustion checking procedure (fig. 23).
In order to verify combustion efficiency the following measurements must be implemented:
- assess combustion air from no. 1 opening (fig. 24);
- assess flue gas temperature and CO
2
from no. 2 opening (fig. 24).
Allow boiler to reach working temperature before taking any measurement.
B
1
2