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Bonus Plus Instructions Tarm Biomass 1-800-782-9927 Version 11/14 Page 33
Boiler Operation, Maintenance, and Service > Cleaning and Maintenance
Ash Removal from the Tunnel Stone
Ash removal from the secondary combustion tun-
nel must be done regularly (daily in winter). The
tunnel must not be obstructed by ash so that the
secondary combustion can take place normally
and the tunnel stone does not over heat. Ne-
glected maintenance can result in irreparable
damage and a premature wear of the tunnel.
It is not necessary to remove the tunnel stone
for cleaning .
Particular attention must be
given to cleaning the back
and front corners of the fire-
box.
Ash removal from behind the tunnel stone
Removing ash from behind the tunnel must be
done regularly. Ash depth should not be allowed
to exceed 2”.
Ash removal from the upper firebox and checking of
the primary air outlets
Ash removal from the upper firebox should be done when
the ash bed reaches 2”. Ashes may also be removed
sooner. Be sure not to let ashes accumulate in the corners
of the firebox. The quantity of ash produced depends on
the type of wood used, its age and its general quality. It is
necessary 2 – 3 times per year to remove the firebox
aprons and clean behind them. This involves removing any
accumulated creosote and ash from the firebox walls and
primary air outlets. Neglected maintenance will result in
premature wear of the ceramic pieces, irreparable deforma-
tion of the firebox aprons and excessive clogging of air
passages.
Fig. 4.9
Fig. 4.10
Fig. 4.11
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