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The combustion air supply must immediately be opened again fully after
replenishment, to rapidly ignite the new wood. This immediately raises the
fire chamber temperature to suitable levels again for complete and environ-
mentally friendly combustion.
Depending on the type and quantity of wood, the remaining embers and
chimney draft, this reheating phase takes about 5 minutes before the com-
bustion air can be throttled again – similar as described under Point 8.
Finished burning!
4. TECHNICAL INFORMATION
4.1 HEATING BETWEEN SEASONS
Proper chimney draft is the fundamental prerequisite for the proper opera-
tion of a fireplace. The draft is dependent on outside temperatures, there-
fore also on seasons. When the seasons change – winter to spring and
summer to autumn – higher outside temperatures may reduce the draft,
manifesting by poor burning or increased smoke generation.
WHAT CAN YOU DO?
• Empty the ash catcher and grid before lighting a fire. Place the ash grid
with the embossed Spartherm logo facing downward.
• If the chimney draft is weak, a bigger “pilot fire” should be created using
small, easily ignitable wood, to reach the required temperature quicker
and thereby create a stable draft in the chimney.
• Leave the air supply adjustment lever turned to the right (maximum air
supply) if necessary, even after the fire has started. It is important to
give the fire enough combustion air to stabilize the chimney draft, but no
more than that, to avoid burning too much wood too quickly.
• Do not turn the adjustment lever fully to the left in the last phase of
burning down. This may cause the chimney draft to collapse and lead to
smouldering in the fireplace insert.
9. The air supply may be further reduced when the
fire has spread to the bottom layer of split logs.
10. The fuel burns down to a pile of embers.
11. Replenish the fire can now whilst the remaining
embers are still burning.
12. If no further replenishment is planned, the
adjustment lever may be fully closed, using the
“cold hand”, as soon the remaining embers are
almost gone.
