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The SF 2600 offers a unique option to the homeowner.
The ability to have an efcient oil backup heat source built
right into a wood/coal furnace.
The operation of the oil burner as a backup system is as
simple as setting a thermostat. To use the oil portion of
your furnace as a backup proceed as follows:
1. Set the wood/coal thermostat to the comfort level you
desire.
2. Set the oil thermostat to a level 5 to 10 degrees but not
less than 3 degrees lower than the wood/coal ther mostat.
That’s all there is to it. The idea is that when the wood/
coal portion can no longer maintain the level set on that
thermostat the oil portion will come on and maintain the
temperature set on the oil thermostat.
In the oil only
mode, simply turn the wood/coal thermostat to its lowest
setting and select the comfort level you desire on the oil
thermostat. The SF 2600 will now act as a standard oil
burner and maintain your chosen temperature. NOTE:
It is recommended that the wood/ coal re in the lower
portion of the fur nace be out or nearly out before going
to “oil only” operation.
- During the rst few hours of burning, a
blue smoke will be observed rising from the painted sur-
face of the furnace. It is advisable to increase the amount
of fresh air in the room during this breaking-in period. This
may be achieved by opening doors, win dows, etc. Don’t
be alarmed. This is normal.
Open the bottom door to
increase the draft. Take about eight sheets of newspaper,
crumbled into balls and place on top of the grates. Next,
lay some ne kindling on top of the paper. This kindling
must be dry and no larger than 3/4” diameter,
and should
be layered in a criss-cross pattern to allow good air ow.
Then, lay some slightly larger pieces (2” diameter) of
wood on top of the kindling. Light the paper at the bottom
just inside the door. Now close loading door and allow
kin dling and wood to catch re. After about ve minutes,
close the bottom door and open the loading door an inch
or two for a few seconds before opening com pletely. This
method will allow the smoke to clear away from the door
opening. Now the re should be well established and ready
for some larger wood. Add four or ve pieces of 3” to 4”
diameter wood. Close loading door and open bot tom door
again. Let burn for about 5 minutes. Now open loading
door using the same method as before, always closing
the bottom door before open ing the top door. Now load
the rebox with wood to the desired fullness. All Harman
furnaces may be loaded with wood as full as possible for
high output and long burn time. Then close the door and
allow all the wood to catch re. The bottom door may
again be opened to speed the process. The object is to get
the wood burning well enough so it will not go out when
the automatic draft shuts back to the idle setting. NOTE:
When the bottom door is open, the automatic draft cannot
function to reduce the amount of air to the re box. For this
reason, the furnace could overheat.
After the wood is burning well, close the bottom door.
The automatic draft control will now regulate the re.
The idle control (as shown on Fig. 6) on the apper door
must be adjusted so the re does not go out or overheat.
Experience will dictate the best setting. Normally the two
manual draft controls
on the loading door are kept closed
to burn wood.
Use the same procedure as for
wood except do not go to large diameter wood. Use wood
about 2” in diameter maximum. This size will form very
hot wood coals in less time. Here again, the bottom door
may be opened to speed the process. When a substantial
bed of red wood coals are developed, start adding a thin
layer of coal. Pea or nut sized coal is better for starting a
re than stove coal. When the rst layer is burning with
some blue ame, continue to add thin layers of coal until
there is a solid bed of burning coal. Let each layer burn
a blue ame before adding another layer. Layers can be
added until the bed is approximately ten inches deep. This
is about at the top of the rebrick. Most users nd that if
they keep the two manual draft controls open about one
quarter turn, it helps keep the gasses burned off.
NOTE; Close the bottom door as soon as the desired coal
bed is made.
- Coal should never be added unless there is
a reasonably hot re. The coal bed should be bright and
vig orous. If the re is burning hot and there is a deep
bed of coals, full loads of coal can be added at any time.
However, if there is not a deep bed of coals, it is best to
add small amounts of coal at rst.
- Shaking should be done only when there
is a well-established re. The frequency of shaking will
depend on the degree of burning. Shaking should be done
whenever the furnace is refueled. Best results for shaking
Harman grates will occur when short choppy strokes are
used rather than long even strokes.