Harman Stove Company SF 3500A User manual

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SAFETY NOTICE
PLEASE READ THIS ENTIRE MANUAL BEFORE YOU INSTALL AND USE YOUR HEATING APPLIANCE. FAILURE
TO FOLLOW INSTRUCTIONS MAY RESULT IN PROPERTY DAMAGE, BODILY INJURY, OR EVEN DEATH.
FOR USE IN THE U.S. AND CANADA. NOT SUITABLE FOR INSTALLATION IN MOBILE HOMES
IF THIS HARMAN STOVE IS NOT PROPERLY INSTALLED, A HOUSE FIRE MAY RESULT. FOR YOUR SAFETY, FOL-
LOW INSTALLATION DIRECTIONS.
CONTACT LOCAL BUILDING OR FIRE OFFICIALS ABOUT RESTRICTIONS AND INSTALLATION INSPECTION
REQUIREMENTS IN YOUR AREA.
CONTACT YOUR LOCAL AUTHORITY (SUCH AS MUNICIPAL BUILDING DEPARTMENT, FIRE DEPARTMENT, FIRE
PREVENTION BUREAU, ETC.) TO DETERMINE THE NEED FOR A PERMIT.
CETTE GUIDE D’UTILISATION EST DISPONIBLE EN FRANCAIS. CHEZ VOTRE CONCESSIONNAIRE DE HARMAN
STOVE COMPANY.
SAVE THESE INSTRUCTIONS.
The Harman SF1500A, SF2500A, SF2600A, SF 3500A
Installation & Operating Manual
R4

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Table of Contents
Packing List 3
Installation 5
Mounting Blower & Filter Box 7
Wiring 8
Duct Work 11
Operation 11
Safety Tips 13
Chimney Troubleshooting 13
Maintenance 14
Specications    15
Coil Installation 16
Oil Burner Setup 18
Warranty 19

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Packing List - SF2600
Blue Angel Oil Burner
Burner Gasket
Automatic Draft Control
Blower
(2) Blower Brackets
Filter Box Kit (3 pieces) + Filter
Fan Control / High Limit
3-Speed Fan Switch (not on SF3500)
(2) Thermostats
(2) Junction Boxes
Relay
High Limit Snap Disc
(4) 1/4 X 3/4 bolts & (4) Filter Box Mounting Clips
36” Flex Conduit
(1) Straight Conduit Fitting
(1) Elbow Conduit Fitting
Ash Pan
Shaker Handle
Owner’s Manual
Warranty Registration
Filter Box
Mounting Clips
Flex- Conduit and Fittings
Junction Boxes
Ash Pan Shaker Handle
Oil Burner
Oil Burner Gasket
3- Speed Fan Switch
Fan Control /
High Limit
Relay
Snap Disc
Thermostats
Blower Brackets
Filter Box Kit
Blower
Automatic Draft Control
Filter

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Packing List for SF1500, SF2500 & SF3500
Blower Mounting Plate w/ 2= 5/16X3/4 bolts ( SF3500 Only)
Automatic Draft Control
Blower
(2) Blower Brackets
Filter Box Kit (3 pieces) + Filter
Fan Control / High Limit
3-Speed Fan Switch (not on SF3500)
Thermostat
Junction Box
Relay
(4) 1/4 X 3/4 bolts & (4) Filter Box Mounting Clips
36” Flex Conduit
(1) Straight Conduit Fitting
(1) Elbow Conduit Fitting
Ash Pan
Shaker Handle
Owner’s Manual
Warranty Registration
Filter Box Kit
Flex Conduit & Fittings
Junction Box
Blower Mount-
SF3500 only
Shaker Handle
Ash Pan
Thermostat
Fan Control /
High Limit
Relay
3-Speed Fan Switch
Blower Brackets
Automatic Draft Control
Blower
Filter Box
Mounting Clips
Filter

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To ensure a safe installation, it
is recommended that this furnace be
installed by a qualied installer.
The sheet metal top and sides can be
easily removed to reduce the chance of dents
or scratches on the painted surfaces.
Toremovethesheetmetal,rstliftoffthetop
section. Now, the sides can be removed by
lifting up and out away from the furnace.
To lighten the SF2600, the oil burner
heat exchanger should be removed. Do so by
rstremovingthesheetmetalasdescribed
above.Removethefrontsheetmetalbyrst
removing the burner collar. Now remove the
the two long bolts on each side of the heat
exchanger.(Figure B) The entire unit can now
be lifted off and moved separately.
Caution: This furnace must not be
installed closer than 24 inches at the
sides and 30 inches from the rear to
combustible materials. The unit may
only be installed on a non-combustible oor surface such as
concrete oor or concrete pad on dirt oor. The hot air plenum
must be a minimum of 2 inches from the ceiling or other com-
bustibles above the plenum.
Locate the furnace as close to the chimney as possible while
still maintaining the above clearances. No more than 8 feet of stovepipe
should be used, including two or less 90° elbows. All horizontal runs of
pipe should have a minimum 1/4 in. rise per foot. All stove pipe must be
24 gauge or thicker.
When re-installing the heat exchanger, inspect the gasket around
the furnace opening, and replace if necessary. (Figure A) Place the heat
exchanger in position and secure with the long bolts and nuts. Be sure the
gasket is compressed evenly.
Re-install the sheet metal by sliding the groove on the bottom of
each side panel over the steel lip on the furnace. The top sheet metal
piece holds the sides in place. The SF2600 front cover gets installed by
anglingthebottomedgeovertheliponthetopoftherebox.Theside
edgesmustslideintothegroovesoneachsideandpushedinushwith
the sides and top. This front piece is held in place by the black ring which
gets tightened around the burner pipe. Do not over tighten as this will
push the sheet metal in too far.
Furnace Installation
Figure A
Figure B
Inspect Gasket prior to re-
installing heat exchanger.
(4) 12in. bolts, two on
each side, attach the heat
exchanger to the furnace.

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Bolt the auto-
matic draft control to
the bottom door. Be
sure to hold the unit
straight while tighten-
ing. After the auto-
matic draft control
is mounted, the two
wires must be strung
throughtheexible
conduitandtwottings
supplied. The knockout
plug of the junction box
must be removed to in-
stalltheconduittting.
Check the door of the
automatic draft control to assure proper operation.
Warning: Keep pieces of wood or coal out of the
draft door opening mechanism, as this could cause
the door to stick.
NOTE: Oil the hinge at the begining of the heating
season with a light oil.
The junction box is best mounted on the side
of the furnace about 1 in. back and 8 in. from the top
ofthesheetmetalside.(g.CorD)Ifthislocationis
inconvenient, anywhere on the right side will work.
SF1500, SF2500, SF3500.
 Thisgurerepresentsthemodels;SF1500,
SF2500, and SF3500. It’s intention is to represent
the approximate location of the various controls.
This drawing may also be used as a recommenda-
tion for routing of the
wiring and approxi-
mate dimension of
control spacing.
Please note
that this drawing is for
reference only. Each
specicinstallationwill
vary.
Furnace Installation
Installing Wood/Coal High Limit Switch-
SF2600 only.
First, install the sheet metal sides as de-
scribed in the previous section. Install the snap disc
switch into the hole on the right side sheet metal.
Then mount the open backed junction box around
the snap switch. Proceed with wiring as shown on
page 10. Also refer to Figure D. in this section.
Mounting The Oil Burner- SF2600 only.
Remove oil burner unit from it’s box. Loosen
the four bolts in the pipe on the front of the furnace.
Insert the nose of the oil gun into the pipe. Before
sliding the oil burner all the way in, apply the gasket
around the nose of the oil gun by wrapping it around
the nose. Next, slide the oil burner into the pipe and
secure it by tightening the four bolts around the col-
lar. Be sure to tighten the bolts evenly to locate the
oilburnerinthecenterofthepipe.Thenalset-up
of the oil burner should be done by an experienced
oil burner technician with the proper equipment. Re-
fer to the SF2600 wiring diagram on page 10 and the
oil burner manual for proper burner set-up. There is
alsoasectionattheendofthismanualwithspecic
oil burner instructions.
Venting Guidelines.
Your Harman hot-air furnace must be vented
toit’sownseparateue-lined“ClassA”chimney,
not less than 8” X 8” in size. The chimney must be
capable of providing a draft reading of at least .06”
water column on a draft meter, in order to function
properly. The Chimney must be a minimum of 16
ft. high, and must be two feet higher than anything
within 10 ft. The chimney must also be at least 3 ft.
higher than the point at which it exits or passes by
the roof. A barometric damper must be installed in
theuetoeliminateexcessivedraft.Anyhorizontal
sections of connector pipe must have at least 1/4 in.
per foot rise. Limit the number of elbows to two or
less. All joints in the connector pipe must be secured
with sheet metal screws.
Assembly.
Bolt the shaker handle to the block on the
lower left side of the furnace, using the bolts and
lock-washers provided.
Bolt the two manual draft controls to the
front load door. Proper installation allows the draft
controls to open approximately 1/2” from the door
surface. See Figure 1.

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SF2600.
 ThisgurerepresentsthemodelSF2600furnace.It’sintentionisto
represent the approximate location of the various controls. This draw-
ing may also be used as a reference for wiring and control spacing.
Pleasenotethatthisdrawingisforreferenceonly.Specicinstalla-
tions will vary.
Mounting The Blower And Filter Box
 Positionthelterboxbetweenthebracketsontherearofthefur-
nace,withthebottomoftheboxrestingontheangeatthebottomof
the furnace. Insert the mounting clips into the bracket slots to secure
thelterbox.(seeFigure2)Next,installtheblowerbracketsontothe
blower being sure to install the rubber feet into the brackets. NOTE:
OntheSF3500,installtheblowermountandblowerbeforethelter
box. All hardware, brackets, etc. for the blower, will be found in the car-
tonwiththeblower.Next,positiontheblowerinthelterbox,centered
behind the inlet hole and allow approximately 1/8 in. space between
therearofthefurnaceandthebloweroutlet.Now,installthelterrail
ontothelterbox.NOTE:Thelterrailisbestinstalledontheside
toward the shaker handle, so that any pipes from the hot water coil do
notinterferewithlterinstallationorremoval.
NOTE: Before proceeding with the installation of the access door, it is suggested that the wiring be com-
pleted.
Theaccessdoorisinstalledbyslippingtheangeonthebottomoftheaccessdooroverthebottomrail
ofthelterboxopening,thenpushthetopofthedooragainstthetopofthelterboxopeningandsecure
with a sheet metal screw.
Furnace Installation
Figure 2
Filter box mounting clips
1/8 in. space between
blower and furnace

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Furnace Installation - Wiring
Wiring
 Beforebeginninganywiring,studytheappropriatewiringdiagramforyourunit.Alsoreferbacktog-
ures C or D for an example of what the completed job will look like. It is your reponsibility to follow all state
and local electrical codes. Locate the best place to route the power for the blower, and drill a 7/8” hole in the
lterbox.Thisholesizewillaccomodatea“romex”connector.Attachtheblowerandpowerwiresasshownon
the appropriate wiring diagram.
Once you have the plenum installed, the fan control with high limit switch can be installed. The Fan
control/high limit switch is packaged with a jumper between the two sets of terminals inside. REMOVE THE
JUMPER WIRE INSIDE THE FAN CONTROL. The fan control should be installed in the right side of the ple-
num and 12 to 18 inches above the top of the furnace. A separate conduit should be run from the fan control to
the junction box.
Mount the thermostat in a central location of the area you want to heat. Run two wires to the junction
box, from the heating terminals on the thermostat. 22 gauge or thicker wire is acceptable.
The next step is to run a 120 volt line from your breaker panel to the junction box. Attach all wires ac-
cording to the corresponding wiring diagram, and install the relay into the junction box. DO NOT TURN ON
THE BREAKER UNTIL ALL WIRING IS COMPLETE AND THE RELAY IS SECURED.
SF1500 and SF2500 Wiring Diagram

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SF3500 Wiring Diagram
SF3500 Wiring Diagram

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SF2600 Wiring Diagram
SF2600 Wiring Diagram

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Duct Work and Operating Instructions
Duct Work.
 Thisgureshowsatypicalduct
system layout. Be sure the entire sys-
tem is properly sized to provide the cor-
rect static pressure for optimum blower
performance. Have any new duct sys-
tem designed by a HVAC professional.
Operating Instructions
Adjusting Automatic Draft
Control - In order for your new furnace
to function, the controls must be prop-
erly adjusted. The heat output is regu-
lated by the automatic draft control, on
thebottomdoorofthefurnace.Refertotheillustrationsatright;Theelectricdraft
motor(A)opensandclosestheapperdoor(B).Theapperdooropenstofeed
moreairtothereandclosestoreducetheairtothere.Themaximumairow
can be adjusted by turning the adjuster bolt (C) counter-clockwise for more air and
clockwise for less air. NOTE: To preserve motor life, all adjustments of this bolt
shouldbedonewhiletheapperdoorisintheclosedposition.Theidleadjuster
(D)controlstheminimumamountofairthatentersthereboxwhentheapper
door is closed. Adjustment is made by turning the adjuster vertical for zero air, or
horizontal for maximum idle air. It is best to start at a medium setting as shown at
right.
Adjusting the fan control- Shut off the power at the circuit breaker be-
fore removing the fan control cover. Make sure the copper jumper (circled below)
is removed before using the furnace. Note the three pointers on the dial. The one on
the right is the high limit adjustment. Pre-set at 200 degrees, it’s function is to close
theautomaticdraftcontrolapperdoorifthetemperaturein
the plenum reaches 200 degrees. Do not change this setting.
The center pointer adjusts the temperature at which the blower
starts. A good initial setting for this is 150 degrees. The pointer
on the left is to adjust the temperature at which the blower
stops. A good initial setting for this pointer is 100 to 110 degrees.
If it is set too low, the air will feel cool coming out of the registers
at the end of the blower cycle.
Thermostat- Set the thermostat to the desired tempera-
ture. When more heat is needed, the thermostat opens the au-
tomaticdraftcontrolapperdoor.Thisallowsairintotherebox,
whichraisestheoutputofthere.Whenthetemperatureinthe
plenum reaches the set temperature of the center pointer on the
fan control, the blower will begin blowing heated air through the
ductwork. When the thermostat reaches it’s setpoint, the automatic draft control closes
theapperdoor,thus,reducingtheoutputofthere.Asthetemperatureintheple-
num drops to the set point of the left pointer on the fan control, the blower will stop. A
solidfuelrecannotceaseoutputimmediately,therefore,yourroomtemperaturemay
exceed the thermostat setting at times. You also may notice times that the blower runs
for a short period even though the draft control is closed. Again, you can’t just stop a
woodorcoalreinstantly,andtemperaturemaybuildenoughtoruntheblower.Thisis
normal and will be noticed more with coal than with wood.
MED
MAX
ZERO
Return Air Supply Trunk
Plenum
Figure 5
Figure 6
Figure 7

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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efcient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
thermostat.
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reinthelower
portion of the furnace be out or nearly out before going
to“oilonly”operation.
Curing Paint -Duringtherstfewhoursofburning,
a blue smoke will be observed rising from the painted
surface 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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 kindling 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 completely. 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 bottom door again.
Let burn for about 5 minutes. Now open loading door
using the same method as before, always closing the
bottom door before opening 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rebox.
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 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.
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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.
Loading - Coal should never be added unless there is
areasonablyhotre.Thecoalbedshouldbebrightand
vigorous.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 - 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.
Operating Instructions

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 -Ashes should never be allowed to accumulate
intheashpitsothattheyinanywayimpedetheowof
combustionairtothere.Excessashaccumulation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disposal.If
the ashes are disposed of by burial in soil or otherwise
locally dispersed, they should be retained in the closed
container [outside the dwelling) until all cinders have
thoroughly cooled.
CAUTION: ASHES SHOULD NEVER BE ALLOWED TO
ACCUMULATE ABOVE THE TOP OF THE ASH PAN.
ASHES IN CONTACT WITH THE BOTTOM OF THE
GRATES ACT AS AN INSULATOR, INTENSIFYING THE
HEAT ON THE GRATES, AND COULD CAUSE THEIR
WARPAGE. WITH AN EXCESSIVE ASH BUILDUP,
PRIMARY COMBUSTION AIR IS RESTRICTED. THUS
THE UNIT’S OUTPUT COULD BE REDUCED.
Coal produces considerably more ash than wood. So the
intervals between emptying are much shorter. For equal
heat output,coal will produce seven to ten times more ash
than wood.
Draft Control Settings - 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 maximum 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 adjustment can be reduced. Never adjust
themaximumairboltwhentheapperdoorisopened.
See Fig. 6 on page 11.
Safety Tips
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 fatal consequences.
With the exception of start up or increasing heat from a
lowre,orremovingashes,thebottomdoorshouldbe
kept closed. Never install a Harman furnace to a chimney
with a history of down drafts.
KEEP CHILDREN AWAY - MAY CAUSE SERIOUS
BURNS.
CAUTION: ALL SURFACES OF FURNACE ARE HOT.
DO NOT TOUCH. KEEP CHILDREN AWAY. SERIOUS
BURNS WILL RESULT IF TOUCHED. THIS IS A HEAT
PRODUCING APPLIANCE.
FUEL/FIRING WARNINGS -
DANGER! FIRE HAZARD! DO NOT USE CHEMICALS
OR FLUIDS TO START OR “FRESHEN UP” A FIRE.
SEVERE BODY BURNS OR A FIRE IN YOUR HOME
COULD RESULT. DO NOT BURN GARBAGE,
GASOLINE, THINNERS, DRAIN OR ENGINE OIL,
KEROSENE, OR FUEL OIL, ETC. AN EXPLOSION,
A HOUSE FIRE OR PERSONAL INJURY COULD
RESULT. KEEP ALL SUCH LIQUIDS WELL AWAY
FROM THE FURNACE WHILE IN USE.
Chimney Problems
Not Enough Draft - 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 creosote or bird nests,
etc.
Improper sized chimney or stovepipe.
Too many elbows.
Distance of more than eight feet between furnace and
chimney.
Down Drafts - Trees or other topographical barriers may
impede the chimneys operation causing a down draft
condition to exist. This can also be caused by adjacent
buildings or chimneys.
Creosote and Condensation - If creosote or
condensation runs out of the chimney or stovepipe,
check the following.
Chimney cap or lining may be defective.
Furnace may be too far from chimney, not allowing the
chimney to get warm.
Wood being burned may be green or wet.
Unit may be too large for home causing wood to be
burned too slow.
Excessive Draft - This can be controlled with a
barometric draft control on the stovepipe.
Operating Instructions/Safety Tips

14
Maintenance
The spiral chamber is basically self-cleaning.
However, if there is a draft problem and you have been
burning wood for a long time with little heat demand,
the spiral chamber may need cleaning. Soft coal will
also require more frequent cleaning. To clean, remove
stovepipe and scrape the creosote from the front
and top of the chamber and remove. The rear of the
chamber will not accumulate creosote.
NOTE: 1/8” to 1/4” of creosote in the spiral chamber
is normal. Creosote can be burned off by burning coal
for a few days.
Firebricks may become cracked during the
course of normal operation. A cracked brick that is still
in place is still doing its job and need not be replaced
immediately. If a brick is broken and has fallen out of
place,itshouldbereplacedimmediately.Therebrick
used in the Harman furnaces are inexpensive and easy
to replace.
The blower manufacturer recommends the
blower motor to be oiled once a year with 10 to 20
drops of light weight oil [check instructions packed in
blower box).
Cleaning Heat-Exchanger (SF2600 Only) -
Remove oil burner by removing four mounting
bolts, Burner can be tied up to ceiling to avoid having
to remove the wiring. Next, remove the collar from the
front cover and remove front cover by tilting out from
top rst. Now the heat exchanger will be exposed.
Next, remove the four nuts that hold on the cover, then
remove the cover. This will expose the inside of the heat
exchanger. Remove spirals by simply pulling them out
and clean the tubes with a brush. Reinstall spirals so
theyareushwiththeendofthetubeandreassemble
unit in reverse of disassembly.
Warranty
Warranty is issued at time of purchase. For the warranty
to become effective, you must return the activation
coupon to Harman, 352 Mountain House Rd., Halifax,
Pennsylvania 17032 as soon as possible. The model/
serial number is found on the front, upper-left corner
of stove.
WARRANTY WILL NOT BE HONORED UNLESS THE
FORM IS COMPLETED IN ITS ENTIRETY!!
Your Signature is Required!!
Harmanfurnacesarewarrantedforve
years in accordance with the warranty
terms.Exclusionstotheveyearswill
be the following items:
A. Electrical Blower (1 year warranty)
B. Door Packing
C. Glass
D. Firebricks
E, Paint
F. Any damage deemed abuse
See a complete copy of the warranty on page 19.
Maintenance

Specications
SF1500 SF2500 SF2600 SF3500
Complete Complete Complete Complete
Heating Capacity- square ft. 2200 3200 3200 4200
Approximate BTU Input 90,000 120,000 120,000 170,000
Blower Size 1000 cfm 1000 cfm 1000 cfm 1450 cfm
Automatic Draft Standard Standard Standard Standard
Filter Box & Filter Standard Standard Standard Standard
3-Speed Fan Switch Standard Standard Standard Single Speed
Fan Control / High Limit Standard Standard Standard Standard
Thermostat Standard Standard Standard Standard
Domestic Hot Water Coil Optional Optional Optional Optional
Firebox Dimensions - Inches 16Wx22Lx20.5H 18Wx26Lx21.5H 18Wx26Lx21.5H 18Wx30Lx25H
Recommended Log Length 18 in. 22 in. 22 in. 27 in.
Maximum Log Length 22 in. 26 in. 26 in. 30 in.
Flue Size 6 in. 7 in. 7 in. 7 in.
Filter Size 14 X 20 14 X 20 14 X 20 14 X 20
Number of Grates 4 5 5 6
Weight 580 Lbs. 700 Lbs. 900 Lbs. 800 Lbs.
Plenum Dimensions 20 X 20 20 X 20 20 X 25 20 X 25
Clearance to Combustibles- Rear 30 in. 30 in. 30 in. 30 in.
Clearance to combustibles- Side 24 in. 24 in. 24 in. 24 in.
Dimensions:
A: 25 in. 26 in. 28 in. 28 in.
B: 20 in. 20 in. 20 in. 20 in.
C: 46.5 in. 47.5 in. 57 in. 52.5 in.
D: 27.75 in. 31 in. 31 in. 36 in.
E: 20 in. 20 in. 25 in. 25 in.
F: 40 in. 41.75 in. 40.5 in. 45 in.
G: 16.5 in. 16.5 in. 16.5 in. 16.5 in.
H: 44.5 in. 47.5 in. 48 in. 52.5 in.
K: 27.5 in. 27.5 in. 27.5 in. 27.5 in.
H
F
G
D
E
K
A
B
C

16
Special Instructions
Hot Water Out Cold Water In
Pressure
Relief Valve
Existing Water
Heater Rear Of
Furnace
Automatic
Air Valve
Pressure
Relief Valve
(Must be within
2 feet of coil)
10 Feet Maximum
Drain
Valve
12
33
4
5
Plumbing Diagram For Thermo-Siphon Method - Maximum Distance = 10 Feet
Place one of the supplied nuts on each leg of the coil. Place the coil through the holes on the back of
the furnace, and adjust the nuts so that the pipes stick out about 1¼ to 1½ inches from the rear of the
furnace.Placetheatwashersandgasketsovereachpipeandtightenthenuts.Youarenowready
to run the piping.
This simple method is the most economical. However, the existing water heater must be less than
10 feet from the furnace. The water inlet, where the Temperature / Pressure Relief valve is located,
must be higher than the top leg of the water coil. The water heater should be elevated, if necessary,
to allow for proper thermo-siphon action.(The method by which hot water will circulate automatically
through the system.)
A. Shut off the water heater and the water supply to it. Drain the tank completely.
B. Remove the Temp. / Presure relief valve and discard. Install a short 3/4 in. nipple and tee (1) along
with a new relief valve.
C. run 3/4 in. copper tubing between the water tank and the top leg of the coil. Install a 3/4 in vent
elbowandautomatic“oattype”airvent(2)inthehighpointoftheline.Within2feetofthetoplegof
the coil, install a 150 lb. pressure relief valve (5). Run 3/4 in. tubing from the release exit of both relief
valves downward (3) so the hot water can escape in the event of an overheat situation.
D. Remove the drain valve, at the bottom of the tank. Install a short 3/4 in. nipple and tee and re-
install the drain valve to the tee (4). Run 3/4 in. tubing between the drain / tee combination and the
lowerlegofthewatercoil.Afteralloftheconnectionsaresecured,rellthewatertank.Turn on the
water heater only after the tank has been completely relled.
Coil Installation:

17
Special Instructions
12
33
45
6
7
8
Hot Water Out
Cold Water In
Temp. / Pressure
Relief Valve
Aquastat, close on rise.
Optional
Automatic
Air Valve
Pressure Relief
Valve - Must be
within 2 ft. of coil
Optional Gate
Valve to Control
Rate of Flow
Circulator Pump
Drain
Valve
Distance between of more than 10 feet
Circulating Pump Method - Distance = 10 Feet or More
This method is used when the water heater tank is more than ten feet away from the furnace or the fur-
nace is on a higher level than the water heater tank. In addition to a circulator pump, you may want to add
a aquastat to thermostatically control the pump according to water temperature. This is optional and not
necessary if the circulator pump is left run continuously. Another option is a gate valve placed near the
pumptocontroltherateofwaterow.
A. Shut off the water heater and the water supply to it. Drain the tank completely.
B. Remove the Temp. / Presure relief valve and discard. Install a short 3/4 in. nipple and tee (1) along with
a new relief valve.
C. Remove the drain valve, at the bottom of the tank. Install a short 3/4 in. nipple and tee and re-install the
drain valve to the tee (4).
D. Install a circulating pump as shown (6). Run 3/4” copper tubing from the circulating pump to the lower
legofthewatercoil.Thisiswheretheoptionalgatevalve(5)canbeinstalledtoregulateow.
E. Install a 3/4 in. tee and a 150 lb. Pressure relief valve (7) in the top leg within two feet of the coil.
F. Complete the 3/4 in. line by running it back to the tee at the top of the water heater tank. Be sure to
install the 3/4 in. vent elbow and automatic air vent (2) at the high point of the line. The optional aquastat
can be installed in this line, a maximum of 6 feet from the furnace. This aquastat must close on rise in tem-
perature and must be hooked up to turn on the circulator when the water temperature reaches 120° f.
G.Aftersecuringallconnections,rellthetankwithwaterandthen,ONLYTHEN,turnonthepowertothe
water heater.

18
SF2600 Burner Set Up
7”
12½”
7¾”
12⅞”
SF2600 Oil Burner Setup
Nozzle 80 Degree Solid Cone
Off Cycle Damper Setting (B) No.1 (as low as it goes
Flamelock Setting (A) No. 1
Combustion Air (C) No. 1 to 1¼
Draft - (Inches of water column) .06 to .08
Tests for CO² must be made without a fire in the wood/ coal firebox, and with all doors and draft controls
completely closed. The burner should be fired for several minutes prior to taking a reading. Normal CO²
reading is 11 to 12 with a stack temperature of 300 degrees or less. This would give you an efficiency of 84
to 85 percent.

Warranties are not transferable. Harman Stove Company warrants its products to be free from defects in material
and workmanship, in normal use and service, for ve (5) years from the date of sales invoice.
If defective in material or workmanship, and if removed by the owner with in 60 months of installation, Harman
Stove Company will, at its option, repair or replace the product as described below.
The warranty above constitutes the entire warranty with respect to Harman Stove Company product. HAR-
MAN STOVE COMPANY MAKES NO OTHER WARRANTY, EXPRESS OR IMPLIED, INCLUDING ANY
WARRANTY OF MERCHANTABILITY, OR WARRANTY OF FITNESS FOR A PARTICULAR PURPOSE. No
employee, agent, dealer, or other person is authorized to give any warranty on behalf of Harman Stove Company.
This warranty does not apply if the product has been altered in any way after leaving the factory. Harman Stove
Company assumes no liability for “resultant damages of any kind” arising from the use of its products. In addition,
the manufacturer shall be held free and harmless of liability for damage to property related to the operation, proper
or improper, of the equipment. THERE ARE NO OTHER WARRANTIES WHICH EXTEND BEYOND THE
DESCRIPTION ON THE FACE HEREOF.
THESE WARRANTIES APPLY only if the device is installed and operated as recommended in the user’s
manual.
THESE WARRANTIES WILL NOT APPLY if damage is caused by abuse, accident, improper installation, neg-
ligence, or use beyond rated capacity.
SERVICE LABOR RESPONSIBILITY - In furnishing replacement parts, Harman Stove Company assumes no
responsibility for any labor expenses, for service removal or reinstallation.
HOW TO MAKE A CLAIM - Any claim under this warranty should be made to the dealer from whom this ap-
pliance was purchased. Then contact is made with the manufacturer, giving the model and serial numbers, the date
of purchase, your dealer’s name and address, plus a simple explanation of the nature of the defect.
SHIPPING COSTS - The transportation charges are as follows:
(1) Customer prepays freight back to factory.
(2) Harman Stove Company prepays the repaired or replaced stove freight charges.
NOTE: Prior approval by phone or in writing shall be made before shipping entire unit to manufacturer.
THIS WARRANTY IS LIMITED TO DEFECTIVE PARTS - REPAIR AND/OR REPLACEMENT AT OUR
OPTION AND EXCLUDES ANY INCIDENTALAND CONSEQUENTIAL DAMAGES CONNECTED THERE-
WITH.
WARRANTY EXCLUSIONS: (1) Labor (2) Ceramic Log Sets (3) Battery Back-ups (4) Firebrick
(5) Door Packing (6) Paint (7) Glass (8) Flame Guide and Insulator (9) Acts of God
PLEASE READ THE LITERATURE BY THE MANUFACTURER FOR THE VARIOUS ACCESSORY DE-
VICES. THESE DEVICES ARE “WARRANTED BY THE MANUFACTURER” NOT BY HARMAN STOVE
COMPANY. FURTHERMORE, THESEACCESSORY DEVICES MUST BE INSTALLED AND USED ACCORD-
ING TO THE RECOMMENDATIONS OF THE MANUFACTURER.
Some states do not allow the exclusion or limitation of incidental or consequential damages, so the above limita-
tion or exclusion may not apply in your state.
This warranty gives you specic legal rights, and you may also have other rights which vary from state to state
which may be enforceable in a Court of Law.
REMEDIES - The remedies set forth herein are exclusive, and the liability of seller with respect to any contract or
sale of anything done in connection therewith, whether in contract, in tort, under any warranty, or otherwise, shall not,
except as herein expressly provided, exceed the price of the equipment or part of which such liability is based.
CLARIFY - The above represents the complete warranty which is given in connection with stoves manufactured
by Harman Stove Company. No other commitments, verbal or otherwise, shall apply except by a written addendum
to this warranty.
1 Year Limited Warranty (Commerical)
5 Year Limited Warranty (Residential)

20