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13
The amount of shaking is critical. Too much will disrupt
the re bed and too little will restrict the air ow.
The proper amount normally occurs when red coals
rst start to drop through the grates into the ash pan.
- Ashes should never be allowed to accumulate
in the ash pit so that they in any way impede the ow
of com bustion air to the re. Excess ash ac cumulation
can cause the re to go out and also can cause severe
damage to the grates because of the absence of a
cooling ow of air beneath them.
Ashes should be placed in a metal container with a
tight tting lid. The closed container of ashes should
be placed on a noncombustible oor or on the ground,
well away from all combustible materials, pending nal
dis posal. If the ashes are disposed of by burial in soil
or otherwise locally dis persed, they should be retained
in the closed container [outside the dwelling) until all
cinders have thoroughly cooled.
Coal produces considerably more ash than wood. So
the intervals be tween emptying are much shorter. For
equal heat output,coal will produce seven to ten times
more ash than wood.
The idle air adjustment on the
apper door may need to be adjusted slightly less for
coal than for wood. Here again, experience will dictate
the best setting. The maxi mum air adjustment bolt can
be set at the maximum position for quick recov-
ery. When a longer than normal burn time is desired,
the maximum air ad justment can be reduced. Never
adjust the maximum air bolt when the ap per door is
opened. See Fig. 6 on page 11.
When opening the loading door, it should be cracked
open slightly for a few seconds to allow oxygen to burn
any gases that may be present and to allow smoke to
be drawn away from the door.
Whenever the bottom door is open, it should be closed
before opening the loading door. This is to increase draft
through the loading door and prevent excess smoke
from escaping.
The rebox should never be lled with excessive coal
so that the ue exit is blocked or impeded in any way.
Burn ing coal generates carbon monoxide. If the ue
gas exit is blocked, the carbon monoxide can be forced
out of the fur nace into the room with possible
consequences.
With the exception of start up or increasing heat from
a low re, or re moving ashes, the bottom door should
be kept closed. Never install a Harman furnace to a
chimney with a history of down drafts.
- Chimney is too low. A chimney
should be two feet higher than anything ten feet around
it.
Air may be leaking in around a loose tting clean-out
door, ue pipe may not be tight at joints, or the masonry
may be defective.
Chimney may be blocked with creo sote or bird nests,
etc.
Improper sized chimney or stove pipe.
Too many elbows.
Distance of more than eight feet between furnace and
chimney.
- Trees or other topo graphical barriers
may impede the chimneys operation causing a down
draft condition to exist. This can also be caused by
adjacent buildings or chim neys.
If creo sote or
condensation runs out of the chim ney or stovepipe,
check the following.
Chimney cap or lining may be defec tive.
Furnace may be too far from chim ney, not allowing the
chimney to get warm.
Wood being burned may be green or wet.
Unit may be too large for home caus ing wood to be
burned too slow.
- This can be controlled with a
barometric draft control on the stovepipe.