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INSTALLATION AND OPERATION MANUAL
• REGULATION OF PRIMARY AND SECONDARY AIR SUPPLY
There is a possibility to regulate the primary and the secondary air supply in the boiler. Volume of the primary air is regulated
by means of the shutter 13 (Fig. 1). The shutter 14 (Fig. 1) is intended for regulation of amount of the secondary air. The supply
of air in both cases is fully blocked when the shutters are pushed to the end. On the contrary, when the shutters are pulled
out, the supply of air is maximal. Shafts of the shutters are secured with fixing bolts. A proportion of the primary and the
secondary air supply is set in a factory and in most cases does not require additional adjusting. The factory settings are: the
shutter 13 should be distanced from "closed" position by 20 mm, the shutter 14 should be pulled out by 15 mm.
• REGULATION OF THE BOILER TEMPERATURE
See the technical description of the electronic regulator KR-4.4.
• ADDITION OF FUEL
It is important to pause the ongoing program of a controller when adding fuel into an operating boiler
(see the description below)! Do not turn off the electrical supply of the boiler while water temperature in
it exceeds 70° C and the lamp 3 “Firing on” lights up (Fig. 11). When the electrical supply is turned off, the
ongoing controller program finishes and the new one starts. As a result, the boiler then rises the temperature
of the water very slowly.
When the boiler is still active, the controller lamp 3 “Firing on” (Fig. 11) light is on. To add more firewood, perform the
following procedure:
1. Press shortly the ventilator button into the "PAUSE" position. A symbol "L" appears on a display and signals "loading of
fuel". The air supply ventilator stops while the smoke exhaust ventilator turns on.
2. Pull out the handle 4 (Fig. 1) of the dampers 11 (Fig. 1) in the way described in Fig. 13. Open a door for loading.
3. Load firewood into the boiler and close the door and the dampers 11 (Fig. 1).
4. Resume the running boiler program by pressing shortly the ventilator button into the "START"position. The symbol "L"
disappears from the display, the smoke exhaust ventilator stops while the air supply ventilator turns on. If this step would
be forgotten to perform the controller would execute it itself automatically after 3 minutes from beginning of PAUSE mode.
If the dampers 11 (Fig. 1) have stuck rigidly pull the handle 3 (Fig. 1) to solve the problem. This handle
is designed specially for tearing off the stuck dampers.
• COMBUSTION CONTROL
The status of the boiler firing process can be perceived from the regulator lamps “Firing on” or “Firing off” (see description of
the regulators KR-4.4, Fig. 11). The flame in the boiler can be checked by opening the door of the lower combustion chamber
when the ventilator is on. The visible tongue of flame has to be yellow or yellow-red and reach the ceramic element; this
means the firing is proceeding in an optimal manner.
Do not keep the lower door of the boiler open for extended periods of time during firing: the lower
chamber contains gases which, when escaping into the boiler room in larger amounts, can impair human health.
• 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.
