INSTALLATION, OPERATION AND MAINTENANCE MANUAL
BiSolid Saver OM-BSSV00/08/2012/EN
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Figure 9. Positioning of the ash tray and the fire-grates, when firing wood logs
with the boilers from series BiSolid Saver W and BiSolid Saver
С
.
Warning
When the boilers from series BiSolid Saver W and BiSolid Saver C operate with
wood logs, with closed fuel feeding door, the ash tray lower side is turned
inwards and the grilles are down.
5.2. CONDENSATION AND TARS
At initial boiler start up a condensation forms over the boiler walls and leaks down in the
combustion chamber. Such condensation on the walls might cause doubt that the boiler
“leaks”. The condensation disappears after depositing of ash on the inside walls, which is
usually achieved after 2 to 4 ignitions. When operating at low heating output, low water
temperature in the boiler and low flue gas temperature, condensation forms on the inside
boiler walls, which leak into the combustion chamber. Because the flue gases condensation
point is 65
o
C the condensation forms only when there is cooling of the gases in the middle
sections of the boiler walls, where the temperature is lower than 65
o
C. If condensing affects
the combustion chamber it means that the used fuel is too wet. In such cases condensation
could leak in the combustion chamber even if the water temperature is higher than 65
o
C.
Tar forms similar to condensation - low heating output, low temperatures and another reason
could be incorrect burning process adjustment (insufficient secondary air flow). The tar can be
removed by a scraper, supplied together with the boiler, but only if the tar is in soft condition.
This can be achieved at boiler water temperature around 90
o
C. Such operating temperature
quickly takes out the heating appliance from its nominal operating mode. Therefore as
optimum fuel are recommended soft types of wood which burn quickly.
Front fire-grate
position
Rear fire-grate
position
Ash tray
position
