Recommendations For Firing Of Universal Boiler - Stropuva S7 Technical Passport Installation And Maintenance Instructions

When using pellets, saw dust briquettes, damp wood or other wood fuel or its residues, we
recommend using air injection collector (fi g. 2), and for enhanced stability of burn we recom-
mend putting other fuel in between fi rewood layer in specifi c places. Air injection collector (fi g.
2) is necessary when using pellets, sawdust briquettes, coal and peat. Any type of fuel must
always be loaded through upper doors (8) (fi g. 1).
When using calorifi c coal we recommend to leave air distributor with combustion chamber
stabilizer (9) (fi g. 1) in lifted position and when there is only half of the load left, let it rest on the
fuel. This will increase the lifetime of air distributor with combustion chamber stabilizer (9) (fi g.
1).

7.2 RECOMMENDATIONS FOR FIRING OF UNIVERSAL BOILER

Air valve that lets air fl ow under fi re grate (19) (fi g. 1) is controlled with help of switch valve
(6) (fi g. 1) on the top part of boiler on the same side as fl ue. Switch valve (6) (fi g. 1) has: a)
handle (bolt for fi xing the primary position of valve) and b) steps for valve opening adjustment.
It is recommended to open bottom door (11) (fi g. 1) after loading the coal and clean small
pieces of coal from the bottom through the grate (19) (fi g. 1). Also at the beginning you can load
smaller pieces of fi rewood on fi re grate (19) (fi g. 1) so the small pieces of coal will not be able to
fall down to the bottom. Load of coal must not be larger than up to the door for fuel loading (8)
(fi g. 1). Put fi rewood (about 2 kg) on top of coal and ignite it.
After ignition, switch valve (6) (fi g. 1) must be lifted of the steps – so that switch valve (6)
(fi g. 1) would be closed and burning would proceed from the top. Depending on the type of fuel
(various briquettes, soft and solid coal, damp fi rewood, pellets) quality burn will go on for 3 to
24 hours. After that (when power is lacking) switch valve (6) (fi g. 1) must be set on the top step.
After hour you should look at the smoke, if it is black and thick, keep gradually closing the switch
valve (6) (fi g. 1) by lowering the bolt every 5 minutes and watching fl ue. Smoke should be grey
and clearly visible (after setting these parameters it can disappear). If smoke is white, lift the
switch valve (6) (fi g. 1) by one or two steps.
Memorize with which step the burn was best and use this step for switch valve (6) (fi g. 1) for
next fi ring of the boiler. But it is advisable to leave switch valve (6) (fi g. 1) closed at the beginning
and just after few hours, when temperature starts to decrease, put it the step you memorized
before.
When using different fuel or coal of different kind, you'll need also to determine and memo-
rize this step by using this method.
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TECHNICAL PASSPORT INSTALLATION AND MAINTENANCE INSTRUCTIONS
ATTENTION!
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