Harman Stove Company Hot Air s SF1500A - Manual (Page 12)

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SF 2600 - Oil Operation as backup -
The SF 2600 offers a unique option to the homeowner. The
ability to have an efficient 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.
SF 2600 - Oil Operation Only - 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 fire in the lower portion of the fur nace be out or
nearly out before going to “oil only” operation.
Curing Paint - During the first 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.
Starting a wood Fire - 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
fine 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 flow. 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 fire. After about five 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 fire should be
well established and ready for some larger wood. Add four
or five 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 firebox 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 fire. 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 fire box. For this reason, the furnace
could overheat.
wArNINg: NEvEr lEAvE ThE bOTTOm dOOr OPEN
whIlE FurNACE IS uNATTENdEd!
After the wood is burning well, close the bottom door. The
automatic draft control will now regulate the fire. The idle
control (as shown on Fig. 6) on the flapper door must be
adjusted so the fire 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.
Starting A Coal Fire • 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 fire than stove coal. When
the first layer is burning with some blue flame, continue to
add thin layers of coal until there is a solid bed of burning
coal. Let each layer burn a blue flame before adding another
layer. Layers can be added until the bed is approximately ten
inches deep. This is about at the top of the firebrick. Most
users find 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.
loading - Coal should never be added unless there is a
reasonably hot fire. The coal bed should be bright and vig-
orous. If the fire 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 first.
Shaking - Shaking should be done only when there is a well-
established fire. 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.
Operating Instructions