Stropuva S7 Installation And Maintenance Manual page 14

When loading coal, use grid bars (see fig. 8.1.), open by pulling up the air valve for coal and peat
turf to clean up ash and slag. Load lump coal, larger coal like a computer mouse cut into smaller
pieces. Do not load any other fuel; only at the top of coal load about 2 kg of dry chipped firewood logs.
Use a pipe air distributor (fig. 8.4.) for burning small coal, a boiler with small coal operates at 50
– 70% lower mode therefore use small coal during warmer days. When loading peat turf, firstly load
large briquettes and then fine peat turfs. After loading with firewood logs, immediately make fire so
that the load would not ignite from remaining embers.
Before firing the boiler, read the manual of draught regulator, check whether a pike of a
regulating screw is in the sag, supporting bar emboss is in its opening and by turning a regulating screw
open an air control valve for 3-5 cm (1).
Kindle the top of the load; slightly close the door leaving a gap of 2-5 cm. When fuel burns up,
close the door and unhook a ring (12) with a lifting cable (13). Liquid fluid used for firing of fireplaces
and ovens can be used for firing of the boiler however it can not be used during combustion. It is not
allowed to pass the air through the lower ash cleaning doors. Open a window or a special opening
outside the boiler wall during boiler burning so that the boiler would intake the air from outside.
When burning coal, do not kindle the boiler. When burning firewood logs during combustion the
boiler can be loaded with firewood logs and bulky tree waste: before that lift up the air distributor and
open the door. During boiler operation it is dangerous to open the doors widely – flame can burn the
face. Therefore at the beginning do not look inside the boiler and keep yourself away, open the firebox
doors only for 2-3 cm and only after 20-30 sec. open the doors and load firewood logs but no more
than two layers (20-30cm), close the door and pull down the air distributor.
After additional loading, combustion quality and economy get worse for a short time therefore
we recommend to do it so that to extend the combustion duration until the next suitable loading and
burning.
Using wet firewood logs or any other timber fuel or its waste, it is recommended to use the air
injection collector and to improve combustion by putting layers of other timber fuel with dry firewood
logs. When burning coal or peat turf, the injection collector is required. Always the load of any other
fuel is fired up though the upper doors (8).
ATTENTION!
The air injection collector is switched on only when the doors are closed when the fire is made.
The sensor of the chimney flue (with a thin capillary 200-300ºC) must be fitted into a flue and water
sensor (70ºC) - between the body and sealing material.
Fig. 8.2. Air injection collector and it's fastening of universal domestic solid fuel boiler. View from the top.
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