20
HEATING BOILERS
: Astra G-18 E, Astra G-25 E, Astra G-32 E, Astra G- 40 E
• DescriPtion of the smoke temPerature sensor function
The smoke temperature sensor is mounted in Astra boilers in order to: 1) help the controller achieve the optimal smoke temperature,
2) turn off the ventilator after firing in the boiler is accomplished, 3) turn off the circulation pump after the firing in the boiler is over.
Although the optimal smoke temperature is set up in the factory, we recommend that you set the temperature by yourself once
again after the installation of the boiler at its operation place. In this way, a more precise temperature will be set up with respect to
the fuel used, draught and other peculiarities of the installation. For that purpose, the boiler must be brought up to an optimal and
stable operation mode, and the smoke temperature at this time must be determined and fixed. First, set the water temperature on
the boiler controller; we recommend 85° C, or at least 75° C. This temperature should be the one you will use to set in the future boiler
operation. Kindle the boiler using the two stages method described in the chapter “Fire bed and tips for effective boiler stoking”.
Verify the state of combustion by opening the lower door after 45-60 minutes from the beginning of firing. At that moment, the
flame tongue must be reaching the lower ceramic element, and the colour of the tongue must be yellow-red. Then check the actual
smoke temperature by pressing the controller knobs “P” and “+” simultaneously. As a result, the screen should display a two-digit
number representing the actual smoke temperature. The number must be multiplied by 10 to determine the actual temperature. For
example, if the number 16 is displayed, that means that the actual measured smoke temperature is 160° C. The number will stay lit for
3 seconds. During this period, the controller knob “P” must be pressed again. The number on the display will blink and will then stay
lit permanently for a short moment; after 3 next seconds, the controller will automatically leave the programming mode and return
to its usual operation mode. Now the new optimal smoke temperature has been set up.
In a usual boiler operation, after the firing has been completed, the smoke temperature sensor will help to turn off the
ventilator of the boiler and the circulation pump. When the temperature of the flue gases drops bellow 75° C, the rotational
speed of the ventilator is minimized and after some more time, the ventilator and circulation pump are turned off.
If you think that that the smoke temperature sensor is unnecessary for your boiler, you can easily shut it off. For that purpose,
take off the rooftop panel of the boiler (Fig.7) and unplug the sensor from the controller’s X3 socket. The boiler controller will
automatically switch to operate by another programme controlling the boiler without the smoke temperature sensor.
• cleaninG the Boiler
Ashes are removed from the boiler every 4-7 days. Open the door of the upper combustion chamber and shovel ashes down to the
lower chamber. Open the door of the lower chamber, take out only ceramic segments 3 (Fig. 2), pour ashes to a metal box. It is not
necessary to take out the triangle ceramic chopper 2 (Fig. 2) at the time of cleaning, ashes underneath it may be raked using scraper.
In any case, strictly follow the established procedure when opening the upper door: open the damper
of the upper flue, then after 20 seconds, open the boiler door.
Clean boiler chambers from tar, pitch and scurf once or twice a month. Clean the boiler when the fuel has been completely
burned and the boiler is cooled down to at least +40°C.
Open the upper cap 15 for cleaning the flue (Fig. 1). Remove the turbulence plates from the flue by hooking them and
pulling them out with the poker, then clean them using a scraper. Clean tar and scurf from combustion chambers and flue
walls using a scraper and metal hog. Clean with the doors of the combustion chambers open. The soot residues falling down
from the flue walls during the cleaning process are raked out of the boiler through the lower opening of the combustion
chamber 25 (Fig. 1), pulling them outwards. When finished, place the turbulence plates back and close the cleaning cap.
control water pressure in the heating system at least once every two weeks. If the pressure drops,
raise it by filling up the system with more water. If the boiler is not being heated for a longer time, drain the
water out of the system when air temperature is below 0°c!
