Harman Stove Company TL300 User Manual download pdf (Page 10)

10 







Draft is widely misunderstood. It is important that you,

the stove operator, realize that draft is a variable ,

not a given quantity. Stoves and chimneys do not 

draft, yet draft is the key to your stove’s performance.

Draft is a force, produced by an operating stove and

the chimney to which it is attached. It is created by

hot gases rising up the chimney, creating a pressure

difference between the inside of your home and the

outside air. It continually moves fresh combustion air

into the stove, and hot exhaust gases out of the stove;

without this constant ow, the re will go out.

Other factors, such as barometric pressure, winds, the

tightness of the home, the total inside chimney volume,

chimney height and the presence of venting devices

such as exhaust fans also play a role in maintaining

an adequate draft. Low barometric pressures, super

insulated homes, and exhaust fans can reduce draft;

winds can play havoc with draft; and too large or too

small a chimney volume can cause reduced draft due

to the excessive cooling or not enough room to vent

the exhaust gases. Introducing outside air directly

to the stove may help remedy a low draft problem.

Some signs of inadequate draft are smoking, odor,

difculty in maintaining the re, and low heat output.

Overdraft can be caused by a very tall chimney even if

it is the recommended size, and can cause overring

of your stove. Signs of an overdraft include rapid fuel

consumption, inability to slow the re, and parts of the

stove or chimney connector glowing red. It is important

that you follow the chimney guidelines in this manual,

including size, type, and height to avoid draft problems.

When installed and operated according to this manual,

the TL300 will produce enough hot gases to keep the

chimney warm so that adequate draft is maintained

throughout the burn cycle.



In general, following these guidelines will ensure

compliance with all national and provincial codes; prior

to beginning your installation, check with your local

building code ofcial(s) regarding any additional local

requirements or regulations which may inuence the

design and placement of your venting system.

The Harman TL300 may be installed with (.6 mm)

24 gauge chimney connector pipe. The size of the

connector should correspond to the size of the ue collar

opening. Do not use makeshift components.

No part of the chimney connector may pass through

an attic or roof space, closet or other concealed space,

or through a oor or ceiling. Whenever possible, avoid

passing the connector through a combustible wall; if you

must, use an approved wall pass-through, described

later in this section.

Assemble the connector beginning at the ue collar,

with the crimped ends pointing towards the stove (to

keep debris and creosote akes inside the system).

Each joint, including the one to the stove’s ue collar

and the one to the chimney itself should be secured

with at least three sheet metal screws. Screws may

be a maximum of 3 inches apart. A 1-1/4" (32 mm)

overlap is required at each joint, including the ue col-

lar attachment. No more than two 90 degree elbows

should be used, and the total length of connector should

not exceed 10 feet (3m) All horizontal runs of connector

must have a minimum upward slope of 1/4 inch per foot

(20 mm per meter).



Occasionally it is necessary to pass the chimney

connector through a combustible wall to reach the

chimney. Depending on your local building codes, and

the pertinent provincial or national codes, there are

several choices for accomplishing this safely. Before

beginning your installation, contact local ofcials, and

also the chimney connector and chimney manufacturer

for specic requirements.

  Three methods are approved by the

Canadian Standards Association. The diagram shows

one method requiring an 18" (460 mm) air space

between the connector and the wall. It allows use of one

or two covers as described in the diagram. The other

two methods are described in detail in the current issue

of CAN/CSA B365, the national standard.

In the U.S., the national code is NFPA

211. While many localities adopt this standard, be sure

to check with local authorities before beginning your

installation.

The NFPA (National Fire Protection Association)

permits four methods for passing through a combustible

wall. A commonly used method to pass through a wall

directly to a masonry chimney is to clear a minimum

12"(305 mm) around the entire chimney connector,

and ll it with brick masonry which is at least 3.5"(90

mm) thick. A reclay liner, minimum 3/8" (9 mm) wall

thickness must run through the brick wall to the chimney

liner (but not beyond the inner surface of the liner). It

must be cemented in place with refractory cement.

This method is illustrated. For details on the other three

options, refer to the most recent edition of the NFPA

211 code.

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Harman Stove Company TL300 User Manual Page 10

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