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7

The  most  common  cause  of  poor
draft  is  an  improperly  sized  flue
liner. We recommend that the chim-
ney  liner’s  inside  dimensions  be  at
least as large as the appliance’s col-
lar size and no larger than 125% of
the  collar  for  a  round  flue.  For
instance, an 8" furnace collar is 50
square  inches;  increased  by  25"%
would  be  63  square  inches,  or
approximately  a  9"  round  flue.  In
general for round liners we recom-
mend  that  they  not  be  increased
more  than  1"  from  that  of  the
Harman’s collar size. The reason for
the  above  is  that  Harman  appli-
ances  are  designed  to  produce  the
maximum  amount  of  heat  per
amount  of  fuel  burned.  A  a  result,
the  flue  gas  temperature  is  lower
than for some similar equipment.

TO  SUMMARIZE,  A  HEAT I N G
UNIT  CAN  PERFORM  ONLY  AS
WELL AS ITS VENTING SYSTEM
WILL ALLOW IT.

5. Creosote

and Soot

5.1 General and Specific 

C reosote Maintenance 
Wa rn i n g s

One of the most critical aspects of
operating  a  woodburning  stove  is
the  control  of  creosote  and  soot.
This  is  especially  important  when
there is a low demand for heat, such
as  in  the  fall  or  spring.  A  good
understanding  of  the  causes  and
cures  for  excess  creosote  or  soot
formation is essential to the opera-
tion of the stove.

Your  stove  and  for  that  matter,  all
types  and  makes  of  woodburning
equipment will give trouble with cre-
osote deposits under certain condi-
tions. You should be aware of these
conditions and avoid them.

When wood is burned slowly, it pro-
duces acetic and other pyroligneous
acids  that  combine  with  expelled
moisture  to  form  creosote.  Highly
combustible in its solid and semi-liq-
uid states, creosote is present in the
gases  given  off  by  burning  wood.
Creosote  may  build  to  a  consider-
able  thickness  on  the  interior  sur-
face of the chimney and stove pipe
subsequently  reducing  draft.  A
SERIOUS FIRE MAY BE IGNITED
IF  A  SUFFICIENT  CREOSOTE
BUILDUP IS PERMITTED.

Creosote  condenses  from  the  flue
gases  more  quickly  when  the  tem-
perature of those gases is low. The
actual amount of creosote deposited
depends on (1) the amount of mois-
ture  in  the  flue  gases,  (2)  the  tem-
perature of the stack, (3) the rate at
which  the  wood  is  burned,  (4)  the
amount of draft in the stack, and (5)
how completely the combustible ele-
ments  in  the  flue  gases  have  been
burned in the combustion chamber.
Most  problems  with  creosote  are
due to insufficiently dry wood, poor
chimneys  with  low  draft  and  cold

walls, and/or a low rate of burning
when  little  heat  is  required  during
the spring and fall months.

Moisture in the Flue Gases May Be
Controlled by:

A. Using  properly  seasoned  fire-
wood.

B. Mixing  small  pieces  with  every
full load.

C. Never  using  only  large  (usually
less dry) wood during mild weather
when combustion is relatively slow.

The Temperature in the Stack May
be Controlled by:

A. Using  as  short  a  length  of
stovepipe  as  possible  between  the
stove and the chimney.

B. Using  an  insulated  flue  pipe  to
connect the stove to the chimney.

The  Amount  of  Draft  in  the  Stack
May be controlled by:

A . Having as few bends as possible.

B. Insuring  adequate  chimney
height and preventing air leaks.

C. Eliminating  external  obstruc-
tions in the chimney outlet.

D. Having only one appliance per
flue.

C A U T I O N ! O W N E R ’ S
R E S P O N S I B I L I T Y

YOU  MUST  CHECK  YOUR
CHIMNEY  FLUE  PIPE  CONNEC-
TOR FREQUENTLY WHEN FIRST
STARTING TO BURN WOOD TO
DETERMINE  THE  AMOUNT  OF
CHIMNEY MAINTENANCE (CLEAN-
ING) THAT WILL BE REQUIRED.
THIS  OF  COURSE,  IS  ALSO
DEPENDENT  ON  WOOD  TYPE,
MOISTURE,  AND  IN  GENERAL,
HOW THE STOVE IS USED.

The  chimney  connector  and  chim-
ney  should  be  inspected  at  least
twice  monthly  during  the  heating
season  to  determine  if  a  creosote

Содержание SF-150 SF-250

Страница 1: ...stallation and Operator s Manual SF 150 SF 250 KEEP THESE INSTRUCTIONS Built to a Standard Not a Price 2003 CAUTION Read Warnings and Safety Considerations Recommendations for safe installation operat...

Страница 2: ...sources on wood heating which you might like to purchase for your home library These include The Woodburning Encyclopedia by Jay W Shelton Wood Heat by John Vivian and The Complete Book of Heating Wi...

Страница 3: ...at To Do When You Have A Problem 4 4 Chimney Details 5 CREOSOTE AND SOOT 5 1 General And Specific Creosote Maintenance Warnings 6 ELECTRICAL 6 1 Electrical Warnings 7 FUEL 7 1 Firewood and Coal Fuel I...

Страница 4: ...enheit It is the owner s responsibility to fol low these recommendations This stove consumes air when it is burning It is advisable that a win dow in the vicinity be opened slight ly while stove is bu...

Страница 5: ...4 3 Assembly Fasten blower to rear of stove by sliding blower into slots provided Heat Collector Diagram Firebrick Diagram SF 150 SF 250...

Страница 6: ...all local and state codes See Figure No 1 of Manufactured Chimney Installations and Figure No 2 of masonry Chimney note roof clearance in accordance with NFPA 211 4 2 Common Chimney Problems In order...

Страница 7: ...r to the room Your home may be so airtight that not enough oxygen is reaching the fire 6 REMEMBER open the draft controls and crack the fire door slightly before recharging the fire chamber or checkin...

Страница 8: ...s on the interior sur face of the chimney and stove pipe subsequently reducing draft A SERIOUS FIRE MAY BE IGNITED IF A SUFFICIENT CREOSOTE BUILDUP IS PERMITTED Creosote condenses from the flue gases...

Страница 9: ...h of its heat value in boiling off this moisture It is difficult to ignite and is sometimes hard to keep burn ing But its major evil is creosote as will be discussed in the next section Seasoning is e...

Страница 10: ...Grates are removable without tools B Burns Three sizes of Anthracite You can burn pea nut or stove coal with these stoves C Exterior Shaker Lever For greater safety from getting burned and greater co...

Страница 11: ...Make final adjustments to bring the stove into a level position by adjusting feet as required Most Harman stoves are equipped with adjustable feet which are adjusted simply by turning them They are 4...

Страница 12: ...eep a professional chimney sweep in mind if you have access to one Steel brushes are the safest for cleaning metal surfaces Salt solu tions and some chemicals may dam age metal surfaces Do not overfir...

Страница 13: ...T ONCE AND THEN OPEN THE DOOR AS THIS WILL CAUSE AN EXPLO SION OF THE UNBURNED GASES IN THE FIREBOX Close and open the draft controls one at a time to the desired setting This setting should normally...

Страница 14: ...ature to stabilize 11 7 Secondary Air The two draft controls on the top door are used to allow secondary air to pass over the fire when burning coal This adds oxygen to the unburned gases primarily me...

Страница 15: ...ode stainless and masonry chimneys and even terra cotta chimney liners and brick in nearby buildings Coal with high sul fur content will destroy chimneys especially fast if soot sits in the flue for e...

Страница 16: ...circulate automatically through the system a Shut off the hot water heater and the old water supply to it Drain the tank completely b Remove the temp press relief valve and discard Install a short 3 4...

Страница 17: ...e the drain valve at the bottom of the tank Install a short 3 4 nipple and tee and re install the drain valve to the tee 4 d Install a circulating pump 6 as shown Run 3 4 copper tubing from the circul...

Страница 18: ...17...

Страница 19: ...VE PARTS REPAIR AND OR REPLACEMENT AT HARMAN STOVE COMPANY S OPTION AND EXCLUDES ANY INCIDENTAL AND CONSEQUENTIAL DAMAGES CONNECTED THEREWITH WARRANTY EXCLUSIONS Failure due but not limited to fire li...

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