Page 1
INSTALLATION & OPERATING
INSTRUCTIONS
HST38, HST-38ND
WOODBURNING FIREPLACE
Note: An arrow () found in the text signifies change in content.
WARNING!
Improper installation, adjustment, alteration, service or maintenance can cause injury or property damage. Refer to this
manual. For assistance or additional information, consult a qualified installer, service agency or the gas supplier.
08/04 27847 Rev H 1
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HST-38 SERIES INSTALLATION INSTRUCTIONS
TABLE OF CONTENTS
Design and Installation Considerations ......................................................................................................................... 3
A. Listings and Code Approvals ......................................................................................................................................... 4
B. Description of the Fireplace System .............................................................................................................................. 4
C. System Components ..................................................................................................................................................... 5
D. Pre-Installation Preparation ......................................................................................................................................... 10
E. Chimney Requirements ............................................................................................................................................... 12
F. Installation of Fireplace ................................................................................................................................................ 15
G. Constructing a Chase .................................................................................................................................................. 23
H. Operating Instructions ................................................................................................................................................. 26
I. Maintenance Instructions ............................................................................................................................................. 30
Index ............................................................................................................................................................................ 31
Warranty ...................................................................................................................................................................... 32
CAUTION:
Do not expose the fireplace to the elements (i.e. rain, etc.) and keep the fireplace dry at all times. Wet insulation
will produce an odor when the fireplace is used.
WARNING!
This fireplace is tested and listed for use only with the optional accessories listed in these instructions. Use of
optional accessories not specifically tested for this fireplace could void the warranty and/or result in a safety
hazard.
Safety Precautions
1. Please read these installation instructions completely before beginning installation procedures. Failure to follow
them could cause a fireplace malfunction resulting in serious injury and/or property damage.
2. Always check your local building codes prior to installation. The installation must comply with all local, regional,
state and national codes and regulations.
3. An adequate supply of replacement combustion air from outside the house must be available to the fire for the
fireplace to operate properly. To achieve this, the use of the optional outside air kit is highly recommended.
In the event the home is unusually tightly sealed, the optional combustion air kit may not provide all the air required
to support combustion. Hearth & Home Technologies is not responsible for any smoking or related problems that
may result from the lack of adequate combustion air. It is the responsibility of the builder/contractor to ensure that
adequate combustion air has been provided for the fireplace.
4. The fireplace must be installed with the Hearth & Home Technologies SL Series Chimney System.
The chimney system must always terminate outside the building. Be sure to follow all chimney specifications given
in these installation instructions.
5. NEVER leave children unattended when there is a fire burning in the fireplace.
6. This fireplace is built for solid fuel only. NEVER use gasoline, gasoline type lantern fuel, kerosene, charcoal light
fluid, or similar liquids in this fireplace. Keep any flammable liquids a safe distance from the fireplace.
7. DO NOT use chimney cleaners or flame colorants in your fireplace.
8. The flue damper must be open at all times when the fireplace is in use.
9. While servicing this fireplace, always shut off any electricity or gas to the fireplace. This will prevent possible electric
shock or burns. Also, make sure the fireplace is completely cooled before servicing.
10. To ensure a safe fireplace system and to prevent the build up of soot and creosote, inspect and clean the fireplace
and chimney prior to use and periodically during the burning season. See “Maintenance Instructions” in this manual
for cleaning instructions.
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HST-38 SERIES INSTALLATION INSTRUCTIONS
DESIGN AND INSTALLATION CONSIDERATIONS
When selecting a location for your woodburning fireplace, it is important to evaluate a number of considerations. Modern
construction techniques can create conditions that may not allow your chimney to draft properly. This may result in smoke
spillage from your fireplace, as well as cause other combustion appliances to operate incorrectly.
Tightly sealed construction is important for energy efficiency. Unfortunately, a great deal of effort has been directed to
tightening up sidewall construction, while considerably less attention has been paid to tightening upper portions of the
warm air envelope (insulated ceilings). This has increased the “Stack Effect”, a condition that increases the negative
pressure generated by the structure. This negative pressure will directly affect the drafting performance of a fireplace
chimney. To minimize the negative pressure generated by stack effect, make certain that all duct work installed in the attic
spaces is sealed airtight. Minimize the number of recessed light fixtures installed in the insulated ceiling, and use sealed
recessed light fixtures. Finally, make certain the whole house fans and attic access panels are tightly sealed. These are
important design considerations that must be observed during the design and construction stage of the home.
If you desire to put a fireplace in your basement, we recommend that you consider a direct vent gas fireplace. Basements
always have a significant negative air pressure that causes the fireplace system to be more susceptible to smoke spillage
and cold flue back drafting. Since direct vent gas fireplaces are sealed, they are not affected by the negative pressure that
exists in basements.
Finally, woodburning fireplaces perform best when their chimney (roof termination) is located on the upper half of the roof,
especially when cathedral ceilings are present. Chimneys that are located on the lower half of the roof realize what is
known as “lazy flue” and will not draft as well as a chimney that is located in the upper portion of the roof. The reason for
this is that the stack effect generated by the overall height of the living spaces inside the house will exceed the draft
generated by the chimney system. If you desire to place a woodburning fireplace in a location where the termination cap
would be located on the lower half of a roof, such as on an outside wall at the base of a cathedral ceiling, we recommend
that you consider using a direct vent gas fireplace. This will assure the homeowner a fireplace that operates correctly.
These properties do not affect just your woodburning factory built fireplace. They can cause any woodburning fireplace as
well as any conventionally vented (B-vent) gas appliance to operate improperly. Careful planning at this stage of your
project will ensure satisfaction with the operation of your fireplace once it is completed.
08/04 27847 Rev H 3
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HST-38 SERIES INSTALLATION INSTRUCTIONS
A. LISTINGS AND CODE APPROVALS
This fireplace system has been tested and listed in
accordance with UL 127 and ULC-S610 standards, and
has been listed by Underwriters Laboratories Inc. for
installation and operation in the United States and Canada
as described in this manual.
This fireplace has been tested and listed for use with the
optional components listed on page 5. These optional
components may be purchased separately and installed at
a later date. However, installation of an outside air kit will
require significant reconstruction and should be installed
at the time of the initial fireplace installation.
Check with your local building code agency prior to installing
this fireplace to ensure compliance with local codes,
including the need for permits and follow-up inspections. If
you need assistance during installation, please contact your
local dealer or the Heat-N-Glo Technical Services
Department, Hearth & Home Technologies Inc.,
1-888-427-3973.
Heat-N-Glo® is a registered trademark of Hearth & Home
Technologies Inc.
WARNING!
This fireplace and its components are designed to be installed and operated as a system. Any alteration to or
substitution for items in this system, unless allowed by these installation instructions, will void the Underwriters Laboratories listing and may void the product warranty. It may also create a hazardous installation. Read
through these instructions thoroughly before starting your installation and follow them carefully throughout
your project.
B. DESCRIPTION OF THE FIREPLACE SYSTEM
1. The Heat-N-Glo fireplace system consists of the following:
a. Fireplace/Integral Grate/Outside Combustion Air System
b. Refractory
c. Chimney Termination Cap
d. Chimney System
e. Hearth Extension
2. Optional Components Include:
a. Glass Doors
b. Chimney Air Kit
c. Fan Kit
Note: Illustrations used throughout these instructions
reflect “typical installations” and are for design purposes only. Actual installation may vary slightly due to
individual design preferences. However, minimum and
maximum clearances must be maintained at all times.
The illustrations and diagrams used throughout these
installation instructions are not drawn to scale.
Figure 1 - Typical Fireplace System
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HST-38 SERIES INSTALLATION INSTRUCTIONS
C. SYSTEM COMPONENTS
1. Fireplace Components
Catalog # Description:
HST-38 Fireplace with Integral Grate, Outside Air Ki t and Hearth Protecti on Strips
AK-225 Outside Air Kit (included with Fireplace)
GDA-175BK Cabinet Style Glass Doors - Black Finish
GDA-175PB Cabinet Style Glass Doors - Polished Brass Finish
HX3 Hearth Extension
GR17 Integral Grate (included with Fireplace)
TK53B1 Trim Kit - Polished Brass
FK-200 Fan Kit
GDA Series
Cabinet Style Glass Doors
GR17
Integral Grate
TK53B1
Trim Kit
HX3
Hearth Extension
08/04 27847 Rev H 5
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HST-38 SERIES INSTALLATION INSTRUCTIONS
Fireplace Dimensions
AK-225 - Outside Air Kit
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HST-38 SERIES INSTALLATION INSTRUCTIONS
2. Chimney Components
The following pictures show only those chimney components which may be safely used with this fireplace.
Catalog # Description:
CAK4A Chimney Air Kit
ID 4 Insula ted D uc t/Outside Air
UD4 Uninsulated Duct/Outside Air
SL306 Chimney Section - 6 in. long
SL312 Chimney Section - 12 in. long
SL318 Chimney Section - 18 in. long
SL324 Chimney Section - 24 in. long
SL336 Chimney Section - 36 in. long
SL348 Chimney Section - 48 in. long
SL3 Chimney Stabilizer
SL315 Chimney Offset/Return - 15-degree
SL330 Chimney Offset/Return - 30-degree
FS338
FS339 Firestop - 15-degree
FS340 Firestop - 30-degree
AS8 SL300 Straight Attic Insulation Shield, 24 in.
JB877 Chimney Joint Band
CB876 Chimney Bracket
RF370 Roof Flashing - Flat to 6/12 Pitch
RF371 Roof Flashing - 6/12 to 12/12 Pitch
TR344 Round Termination Cap
TR342 Round Telescoping Termination Cap
ST375 Square Termination Cap
TS345 Square Termination Cap
TS345P Square Termination Cap - Painted
TCT375 Terra Cotta Termination Cap
CT35 Chase Top
LDS33 Decorative Shroud - 3 ft x 3 ft
LDS46 Decorative Shroud - 4 ft x 6 ft
Firestop - Straight
08/04 27847 Rev H 7
Page 8
Chimney Sections
Catalog # A B
SL306 6 in. 4-3/4 in.
SL312 12 in. 10- 3/4 in.
SL318 18 in. 16- 3/4 in.
SL324 24 in. 22- 3/4 in.
SL336 36 in. 34- 3/4 in.
SL348 48 in. 46- 3/4 in.
A = Actual length
B = Effective length (length of
chimney part after it has
been snapped to another)
HST-38 SERIES INSTALLATION INSTRUCTIONS
SL3 - Chimney Stabilizer
Offset/Return
Firestop Spacer
Catalog # A B
FS338 0-deg. 14-1/2 in.
FS339 15-deg. 18-3/8 in.
FS340 30-deg. 23 in.
CB876
Chimney Bracket
JB877
Joint Band
RF370 - Roof Flashing
Flat to 6/12 Pitch
RF371 - Roof Flashing
6/12 to 12/12 Pitch
AS8
Straight Attic
Insulation Shield
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HST-38 SERIES INSTALLATION INSTRUCTIONS
LDS33 (3 ft x 3 ft)
LDS46 (4 ft x 6 ft )
Decorative Shroud
ST375
Square Termination Cap
TR344
Round Termina-
tion Cap
TS345/TS345P
Square Termination Cap
TR342
Round Telescoping
Termination Cap
TCT375
Terra Cotta Cap
CT35
Chase Top
CAK4A
Chimney Air Kit
08/04 27847 Rev H 9
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HST-38 SERIES INSTALLATION INSTRUCTIONS
D. PRE-INSTALLATION PREPARATION
1. Fireplace Locations and Space Requirements
It is important to note that certain see-through fireplace installations are more susceptible to smoke spillage than
others. Rooms of greatly unequal air volumes that are separated by a see-through fireplace, rooms with cathedral
ceilings and rooms connected by long passageways will create conditions where unequal air pressures will cause a
see-through fireplace to vent improperly. Glass doors may have to be operated in the closed position to minimize
smoke spillage. The fireplace may be located as shown in Figure 2, depending on your fireplace. This fireplace may
be used as a room divider or installed along a wall.
CLEARANCES!
A minimum 1/2 in. air
clearance must be
maintained at the sides of the
fireplace assembly.
Chimney sections at any level
require a 2 in. minimum air
space clearance between the
framing and chimney section.
These are
rough
framing
dimen-
sions only.
Figure 2 - Fireplace Locations
Figure 2 shows the minimum distance to combustible surfaces for side walls and for walls facing the fireplace openings,
as well as minimum hearth extension dimensions.
WARNING!
Do not draw outside air from garage spaces. Exhaust products of gasoline engines are hazardous.
Do not install outside air ducts such that the air may be drawn from attic spaces, basements or above the
roofing where other heating appliances or fans and chimneys exhaust or utilize air. These precautions will
reduce the possibility of fireplace smoking or air flow reversal.
WARNING!
To prevent contact with sagging or loose insulation, the fireplace must not be installed against vapor barriers
or exposed insulation. Localized overheating could occur and a fire could result.
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HST-38 SERIES INSTALLATION INSTRUCTIONS
2. Frame the Fireplace
This fireplace will fit a framed opening of 38-3/4 in. wide x 38-1/2 in. tall. The finished cavity depth must be no less
than 21-1/4 in.
Figure 3 shows a typical framing (using 2 x 4 lumber) of the fireplace, assuming combustible materials are used.
All required clearances to combustibles around the fireplace must be adhered to. Any framing across the top of the
fireplace must be above the level of the top standoffs. Chimney sections at any level require a 2 in. minimum air
space clearance between the framing and chimney section.
Figure 3 - Framing the Fireplace
CLEARANCES!
A minimum 1/2 in. air clearance must
be maintained at the sides of the
fireplace assembly.
Chimney sections at any level require
a 2 in. minimum air space clearance
between the framing and chimney
section.
WARNING!
Do not apply combustible finishing materials over any part of the black face of this fireplace or a structure fire
may result. The black metal fireplace front may only be covered with noncombustible materials such as ceramic tile, brick, or stone. Do not cover or block any cooling air slots. Do not cover any portion of the opening
to the fireplace that would prevent the installation of an authorized glass door.
08/04 27847 Rev H 11
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HST-38 SERIES INSTALLATION INSTRUCTIONS
3. Sidewalls/Surrounds
Adjacent combustible side walls must be located a minimum of 12 in. from the fireplace openings. See Figure 4.
If you are using a decorative surround constructed of combustible material, it must be located within the shaded
area defined in Figure 4. Short stub walls are also acceptable if they are contained within the shaded area.
Figure 4 - Sidewalls and Surrounds
E. CHIMNEY REQUIREMENTS
When planning your fireplace location, the chimney construction and necessary clearances must be considered. The
fireplace system and chimney components have been tested to provide flexibility in construction. The following figures are
the minimum distances from the base of the fireplace.
1. Minimum overall straight height 14.5 ft
2. Minimum height with offset/return 16 ft
3. Maximum height 90 ft
4. Maximum chimney length between an offset and return 10 ft
5. Maximum distance between chimney stabilizers 35 ft
6. Double offset/return minimum height 20 ft
7. Maximum unsupported chimney length between the offset and return 6 ft
8. Maximum straight unsupported chimney height above the fireplace 35 ft
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HST-38 SERIES INSTALLATION INSTRUCTIONS
1. Using Offsets and Returns
a. To bypass any overhead obstructions, the chimney may be offset using a 15-deg offset/return or a 30-deg
offset/return. Perform the following steps to determine the correct chimney component combination for your
particular installation.
b. An offset and return may be attached together or a chimney section(s) may be used between an offset and
return.
1) Measure how far the chimney needs to be shifted to enable it to avoid the overhead obstacle. See Figure 5,
dimension “A” to determine chimney sections required to achieve the needed shift.
2) After determining the offset dimension, refer to Table 1 and find the “A” dimension closest to but not less than
the distance of shift needed for your installation.
3) The “B” dimension that coincides with the “A” dimension represents the required vertical clearance that is
needed to complete the offset and return.
4) Read across the chart and find the number of chimney sections required and the model number of those
particular chimney parts.
5) Whenever the chimney penetrates a floor/ceiling, a firestop spacer must be installed.
6) The effective height of the fireplace assembly is measured from the base of the fireplace to the top of the
starter collar.
WARNING!
Do not combine offsets to create an offset greater than 30 deg from vertical. This may create a fire hazard since the natural draft may be restricted.
Table 1 Offset Chart*
15-degree 30-degree
ABAB
1-5/8 in.13-3/8 in.3-7/8 in.14-1/2 in.------
2-7/8 in.17-3/4 in.6-1/4 in.18-5/8 in.1-----
4-1/8 in.22-3/8 in.8-5/8 in.22-3/4 in.2-----
4-1/2 in. 23-5/8 in. 9-1/4 in. 23-3/4 in. - 1 - - - -
5-3/4 in. 28-1/4 in. 11-5/8 in. 27-7/8 in. 1 1 - - - -
6 in. 29-3/8 in. 12-1/4 in. 29 in. - - 1 - - -
7-1/4 in. 34 in. 14-5/8 in. 33 in. - 2 - - - -
7-3/4 in. 36-1/8 in. 15-1/4 in. 34-1/8 in. - - - 1 - -
8-3/4 in. 39-3/4 in. 17-5/8 in. 38-1/4 in. 1 - - 1 - -
10-3/8 in. 45-5/8 in. 20-5/8 in. 43-1/2 in. - - 2 - - -
10-5/8 in.46-3/4 in.21-1/4 in.44-5/8 in.----1-
11-7/8 in. 51-3/8 in. 23-5/8 in. 48-3/8 in. 1 - - - 1 -
13-1/2 in. 57-1/4 in. 26-5/8 in. 53-7/8 in. - - - 2 - -
13-3/4 in.58-3/8 in.27-1/4 in.55-3/4 in.-----1
15 in.63 in.29-5/8 in.59 in.1----1
16-1/2 in. 68-3/4 in. 32-5/8 in. 64-1/4 in. - 1 - - - 1
18 in. 74-5/8 in. 35- 5/8 in. 69-1/2 in. - - 1 - - 1
19-5/8 in. 80-3/8 in. 38-5/8 in. 74-5/8 in. - - - 1 - 1
20-5/8 in. 84-1/8 in. 41 in. 78-3/4 in. 1 - - 1 - 1
22-3/4 in.91-7/8 in.44-5/8 in.85 in.----11
24 in. 96-1/2 in. 47 in. 89-1/8 in. 1 - - - 1 1
25-7/8 in. 103-1/2 in. 50-5/ 8 in. 95-1/2 in.
SL306 SL312
-----
SL318 SL324 SL336 SL348
* Proper assembly of air cooled chimney parts result in an overlap at chimney joints
of 1-1/4 in. Effective length is built into this chart.
Figure 5
Chimney Offset/Return
Example: Your “A”
dimension from Figure 5 is
14-1/2 in. Using Table 1 the
dimension closest to, but not
less than 14-1/2 in. is
14-5/8 in. using a 30-deg
offset/return. It is then
determined from the table
that you would need 33 in.
(Dimension “B”) between
the offset and return. The
chimney components that
best fit your application are
two SL312s.
08/04 27847 Rev H 13
Page 14
2. Chimney Height Requirements (above
roof line)
a. Major building codes specify a minimum chimney
height above the roof top. These specifications
are summarized in what is known as the Ten Foot
Rule. This rule states:
“If the horizontal distance from the side of the
chimney to the peak of the roof is 10 ft or less, the
top of the chimney must be at least 2 ft above the
peak of the roof, but never less than 3 ft in overall
height above the highest point where it passes
through the roof.
“If the horizontal distance from the side of the
chimney to the peak of the roof is more than 10 ft,
a chimney height reference point is established
on the surface of the roof a distance of 10 ft from
the side of the chimney in a horizontal plane. The
top of the chimney must be at least 2 ft above this
reference point, but never less than 3 ft in height
above the highest point where it passes through
the roof.” See Figure 6.
b. These chimney heights are necessary in the
interest of safety but do not ensure smoke-free
operation. Trees, buildings, adjoining roof lines,
adverse wind conditions, etc. may create a need
for a taller chimney should smoking occur.
HST-38 SERIES INSTALLATION INSTRUCTIONS
3. Number of Sections Required
To determine the chimney components needed to
complete your particular installation, follow the steps
below:
a. Determine the total vertical height of the fireplace
installation. This dimension is measured from the
base of the fireplace assembly to the point where
the smoke exits the termination cap.
b. Subtract the effective height of the fireplace
assembly from the overall height of the fireplace
installation (measured from the base of the
fireplace to the bottom of the termination cap).
c. Refer to Table 2 to determine what components
must be selected to complete the fireplace
installation.
d. Determine the number of firestop spacers, stabi-
lizers, roof flashing, etc. required to complete the
fireplace installation.
Figure 6 - Chimney Height
Table 2
HEIGHT OF CHIMNEY COMPONENTS
Chimney Stabilizer
SL3 4-3/4 in.
Firestop Spacers
FS338 0 in.
FS339 0 in.
FS340 0 in.
Offsets/Returns
SL315 13-3/8 in.
SL330 14-1/2 in.
Roof Flashing
RF370 0 in.
RF371 0 in.
Chimney Sections*
SL306 4-3/4 in.
SL312 10-3/4 in.
SL318 16-3/4 in.
SL324 22-3/4 in.
SL336 34-3/4 in.
SL348 46-3/4 in.
*Dimensions reflect effective height.
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HST-38 SERIES INSTALLATION INSTRUCTIONS
F. INSTALLATION OF FIREPLACE
WARNING!
Before starting, do the following:
1. Wear gloves and safety glasses for protection.
2. Keep hand tools in good condition. Sharpen cutting edges and make sure tool handles are secure.
3. Always maintain the minimum air space required to the enclosure to prevent fire.
1. Position the Fireplace
This fireplace may be placed on either a combustible
or noncombustible continuous flat surface. Follow the
instructions for framing on pages 10-12. Slide the
fireplace into position. Be sure to provide the
minimum air clearance at the sides of the fireplace
assembly.
2. Place the Protective Metal Hearth Strips
Included with your fireplace you will find metal hearth
strips measuring approximately 28 in. x 4 in. These
strips are used to provide added protection where the
fireplace and the hearth extension meet.
Slide the metal strips 2 in. under the front edge of the
fireplace (two strips per opening). The individual pieces
must overlap each other by 1 in. minimum in the
middle of the fireplace openings to provide
continuous coverage of the floor. See Figure 7. These
metal strips should extend from the front and sides of
the fireplace opening by 2 in.
3. Level the Fireplace
Level the fireplace side-to-side and front-to-back. Shim
with noncombustible material, such as sheet metal,
as necessary. Secure the fireplace (using the nailing
flanges located on either side of the fireplace) to the
vertical framing.
Important: To ensure proper fit of the glass doors,
check the fireplace opening for square. Measure
diagonal distances of the opening to make sure
they are equal. If they are not equal, continue to
shim the fireplace until those diagonals are equal.
08/04 27847 Rev H 15
Figure 7 - Positioning the Metal Strips
Page 16
4. Assemble Chimney Sections
Attach either a straight chimney section or an offset to
the top of the fireplace (depending on your installation
requirement). Chimney sections are locked together
by pushing downward until the top section meets the
stop bead on the lower section.
The inner flue is placed to the inside of the flue section
below it. The outer casing is placed outside the outer
casing of the chimney section below it. See Figure 8.
WARNING!
Carefully follow the instructions for assembly
of the pipe and other parts needed to install this
fireplace system. Failure to do so may result in
a fire, especially if combustibles are too close
to the fireplace or chimney and air spaces are
blocked, preventing the free movement of cooling air.
5. Install Firestop Spacers
Mark and cut out an opening in the ceiling for the
firestop spacer being utilized (14-1/2 in. x 14-1/2 in.
for an FS338, 14-1/2 in. x 18-3/8 in. for an FS339 and
14-1/2 in. x 23 in. for an FS340). Frame the opening
with the same dimension lumber used in the ceiling
joists.
Install the firestop spacer.
These firestop spacers are designed to provide the
minimum 2 in. air space required around the chimney.
In all situations, the firestop spacers are to be nailed
to the ceiling joists from the bottom or fireplace side,
EXCEPT when the space above is an insulated ceiling
or attic space. In this situation, the firestop spacer must
be nailed from the top side to prevent loose insulation
from falling into the required 2 in. air space around
the chimney. See Figure 9.
HST-38 SERIES INSTALLATION INSTRUCTIONS
Figure 8
Assembling Chimney Sections
CAUTION:
Firestop spacers must be used whenever the
chimney penetrates a ceiling/floor area.
Figure 9
Installing the Firestop Spacer
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HST-38 SERIES INSTALLATION INSTRUCTIONS
6. Attic Insulation Shield
An insulation shield should be installed when there
is a possibility of insulation coming into contact with
the factory built chimney system.
a. Bend the tabs at the top of the attic insulation
shield inward. This will help keep the chimney
section centered in the shield.
b. Position the shield over the vertical chimney
section where it penetrates a firestop spacer.
c. Slide the shield down until it rests on the firestop
spacer. The firestop spacer will support the
insulation shield. See Figure 10.
8. Secure the Chimney System
When offsets and returns are joined to straight pipe
sections, they must be locked into position with the
screws provided (outer only), using the predrilled
holes. To prevent gravity from pulling the chimney
sections apart, the returns and the chimney stabilizers
have straps for securing these parts to joists or rafters.
See Figure 11.
Note: You must provide support for the pipe dur-
ing construction and check to be sure inadvertent
loading has not dislodged the chimney section
from the fireplace or at any chimney joint.
Figure 10 - Installing an Attic Insulation Shield
WARNING! RISK OF FIRE.
Do not fill the space between the chimney section and the insulation shield with insulation.
7. Double-check the Chimney Assembly
Continue assembling the chimney sections up through
the firestop spacers as needed. While doing so, be
aware of the height and unsupported chimney length
limitations that are given on page 12 under “Chimney
Requirements”.
Check each section by pulling up slightly from the top
to ensure proper engagement before installing the
succeeding sections. If they have been connected
correctly, they will not disengage when tested.
CAUTION:
Inner flue and outer liner sections cannot be
disassembled once locked together. Plan ahead
to ensure the proper installation height is
achieved with the selected chimney
components.
Figure 11 - Offset/Return with Stabilizer
WARNING!
When chimney sections exceeding 6 ft in length
are installed between an offset and return,
structural support must be provided to reduce
off-center loading and prevent chimney sections
from separating at the chimney joints.
WARNING!
Maintain a minimum of 2 in. air clearance to all
parts of the chimney system at all times! Fail-
ure to maintain this 2 in. air clearance will cause
a structure fire.
08/04 27847 Rev H 17
Page 18
9. Mark the Exit Point of the Roof
Locate the point where the chimney will exit the roof
by plumbing down to the center of the chimney. Drive
a nail up through the roof to mark the center. See
Figure 12.
10. Cut Out the Hole in the Roof
Measure to either side of the nail and mark the
14-1/2 in. x 14-1/2 in. opening required. This is
measured on the horizontal; actual length may be
larger depending on the pitch of the roof. Cut out and
frame the opening. See Chapter 25 of the Uniform
Building Code for roof framing details.
Be sure to maintain a 2 in. minimum air space
between the chimney section and the roof.
11. Assemble the Chimney Sections
Through the Roof
Continue to add chimney sections through the roof
opening, maintaining at least a 2 in. air space.
12. Install the Roof Flashing
If a roof flashing is to be used, install the roof flashing
appropriate to the roof pitch and install a round
termination cap following the instructions shipped with
the cap.
For chase installations you can use a round
termination cap (TR344), a round telescoping
termination cap (TR342) or a square termination cap
(ST375, TS345, TS345P). A chase installation must
use a chase top. Chase tops are available from your
Heat-N-Glo distributor. Refer to page 23 for
information on building a chase.
13. Install the Chimney Air Kit (Required in
Canada)
When installing the chimney air kit, follow the
instructions provided with this accessory.
HST-38 SERIES INSTALLATION INSTRUCTIONS
Figure 12 - Ceiling/Attic Construction
CAUTION:
The air kit handle may get hot while burning
the fireplace. Use care when operating the
handle.
Figure 13 - Air Kit Handle Location
18 27847 Rev H 08/04
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HST-38 SERIES INSTALLATION INSTRUCTIONS
14. Install the Outside Air Kit
This fireplace is equipped to accept outside
combustion air if desired or required by local code. It
is recommended that the outside air system be used
whenever practical. The AK-225 Outside Air Kit consists
of one house vent, two plastic ties and one starting
collar.
UL Listed Class I, 4 in. flexible air duct should be
installed to bring outside air from the exterior of the
structure to the fireplace. The house vent should be
installed on the exterior of the structure. It must not
draw air from attic spaces, garage spaces, or other
areas that may contain combustible fumes.
The outside air kit inlet thimble should be positioned
at least 4 ft above the ground level, in a manner that
will not allow snow, leaves, etc. to block the inlet.
Note: An HST-38 series fireplace installed in a
manufactured home requires 6 in. duct for outside
WARNING!
All electrical wiring and connections must conform to local codes and/or with the National
Electric Code, ANSI/NFPA No. 70-(current). All
electrical connections must be made by a licensed electrician.
15. Install the Fan Kit
An optional fan kit, Model # FK-200 is available for the
HST-38 Series fireplace. Detailed installation
instructions are provided with the FK-200 Fan Kit.
A 110 volt AC switch electrical service must be
connected to the fan kit system by a licensed
electrician. See Figures 14-15 for the wiring diagram
and fan mounting illustration.
Note: A 12 in. x 12 in. hole must be provided in the
adjacent finished wall to access the FK-200 Fan
Kit. See Figure 3, Framing the Fireplace.
Note: The electrical junction box is mounted on
the fan.
Figure 14 - Blower Wiring
Figure 15 - Fan Mount
08/04 27847 Rev H 19
Page 20
16. Complete the Enclosure
Complete the fireplace enclosure, allowing space for
outside air ducts and gas piping if desired. Electrical
wiring should not come in contact with the fireplace. A
minimum clearance of 1/2 in. must be maintained
between the fireplace sides and the enclosure. See
pages 10-12 for framing details.
Note: Use only a noncombustible material to fin-
ish the face of the fireplace below the level of the
front standoffs. A noncombustible material such as
USG MICORE CV230 Mineral Fiber Board, or USG
DUROCK Cement Board is recommended for this
purpose.
CAUTION:
When using a gas log set, the fireplace damper
must be set in the fully open position. This ensures proper venting of combustion products.
HST-38 SERIES INSTALLATION INSTRUCTIONS
Figure 16 - Air Clearance Around Gas Line
17. Gas Log/Lighter Provisions
Knockouts are provided on both sides of the fireplace
to allow for connection of a certified gas log lighter or
a decorative gas appliance with a maximum input of
100,000 BTU/hour, incorporating an automatic gas
shutoff device and complying with the Standard for
Decorative Gas Appliances for Installation in
Vented Fireplaces, ANSI Z21.60. The decorative gas
appliance should be installed in accordance with the
National Fuel Gas Code, ANSI Z223.1-1980. The side
refractories are designed to allow 1/2 in. iron pipe to
pass through. Use a noncombustible sealant to seal
any opening between the gas pipe and refractory on
the inside. Repack the insulation removed to seal
around the gas pipe where it exits the side of the
fireplace. A minimum 1-1/2 in. air clearance must be
provided around the 1/2 in. iron pipe for a minimum of
4 in. beyond the fireplace. See Figure 16.
WARNING!
This fireplace was not tested by the fireplace
manufacturer for use with an unvented gas log
heater. To reduce risk of injury, do not install
an unvented gas log heater in this fireplace unless it has been specifically tested and listed
by Underwriter’s Laboratories Inc. for use in
this specific model fireplace. Unless the
unvented gas log heater is tested and listed for
use in this factory built fireplace, a fire hazard
may be created that can result in a structure
fire.
CLEARANCES!
A minimum 1/2 in. air clearance must be maintained
at the sides of the fireplace assembly.
Chimney sections at any level require a 2 in.
minimum air space clearance between the framing
and chimney section.
20 27847 Rev H 08/04
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HST-38 SERIES INSTALLATION INSTRUCTIONS
18. Hearth Extension
A hearth extension must be installed with all fireplaces to protect the combustible floor in front of the fireplace from
both radiant heat and sparks.
The construction of, and materials used for a hearth extension are shown in Figures 17-18. A hearth extension of this
construction may be covered with any noncombustible decorative material and may have a maximum thickness as
per the illustration. Seal gaps between the hearth extension and the front of the fireplace with a bead of noncombustible
sealant.
Figure 17 - Factory Built Hearth Extension
Field constructed hearth extensions should be constructed in accordance with the instructions in Figure 18. The field
constructed hearth extension must be constructed from 1/2 in. MICORE CV230, or a material with an equivalent
insulation value.
Figure 18 - Field Constructed Hearth Extension
WARNING!
Hearth extensions are to be installed only as illustrated to prevent high temperatures from occurring
on concealed combustible materials. Hearth sealing strips prevent burning or hot particles from
inadvertently falling directly on combustible surfaces in the event the building should settle and
disturb the original construction.
08/04 27847 Rev H 21
Page 22
HST-38 SERIES INSTALLATION INSTRUCTIONS
19. Position the Hearth Extension
Position and secure the hearth extension over the
protective metal strips that have been placed partially
under the fireplace front. These strips should be
protruding approximately 2 in. from under the fireplace
front and 2 in. on both sides of the fireplace openings.
Seal the crack between the hearth extension and
fireplace with a bead of noncombustible sealant.
See Figure 19. Apply a noncombustible finishing
material of your choice to the hearth extension.
20. Finishing Material
Do not install combustible materials over the black
face of the fireplace! This poses a safety hazard
and may start a fire. You may only use noncombustible
material over the black face of the fireplace.
a. Combustible Material
Material which is made of or surfaced with wood,
compressed paper, plant fibers, plastics, or any
material capable of igniting and burning, whether
flame proofed or not, plastered or unplastered.
b. Noncombustible Material
Material which will not ignite and burn. Such
materials are those consisting entirely of steel,
iron, brick, tile, concrete, slate, glass or plasters,
or any combination thereof.
c. Noncombustible Sealant Material
Sealants which will not ignite and burn; General
Electric RTV103 Black (or equivalent), Rutland,
Inc. Fireplace Mortar #63 (or equivalent).
After completing the framing and applying the
facing material (dry wall) over the framing, a 1/2 in.
wide (maximum) bead of noncombustible sealant
must be used to close off any gaps at the top and
sides between the fireplace and facing to prevent
cold air leaks.
Only noncombustible materials may be used to
cover the black metal fireplace front.
Figure 19 - Position the Hearth Extension
21. Mantel
A combustible mantel may be positioned no lower
than 12 in. above the top of the fireplace openings.
The combustible mantel may have a maximum depth
of 12 in. See Figure 4, page 12. Combustible trim
pieces that project no more than 1-1/2 in. from the
face of the fireplace can be placed no closer than 6 in.
from the top of the fireplace openings. Combustible
trim must not cover the black metal surfaces of the
fireplace. This mantel clearance is in accordance with
Section 7-3.3.3 of ANSI/NFPA211.
22. Glass Doors
This fireplace has been tested and listed for use with
doors as specified in Section C, “System Components”.
Please refer to the manual packed with each set of
doors for installation instructions.
22 27847 Rev H 08/04
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HST-38 SERIES INSTALLATION INSTRUCTIONS
G. CONSTRUCTING A CHASE
A chase is a vertical boxlike enclosure built around the
chimney and fireplace. A chase may be constructed for
the fireplace and chimney or for the chimney only. It is most
commonly constructed on an outside wall.
In cold climates, it is recommended that the chase floor
be insulated using batt type insulation between the floor
joists.
Two examples of chase applications are shown in
Figure 20.
1. Chimney offset through exterior wall and
enclosed in chase.
2. Chase constructed on roof.
1. Materials
a. The chase is constructed using framing materials
much the same as the walls in your home. A variety
of materials may be used including brick, stone,
veneer brick, or standard siding materials.
b. In constructing the chase, several factors must be
considered:
1) Maintain a 2 in. air space around the chimney.
2) The chase top must be constructed of
noncombustible material.
3) In cold climates, a firestop spacer should be
installed in an insulated false ceiling at the 8’
level above the fireplace assembly. This
reduces heat loss through the chase.
4) In cold climates, the walls of the chase should
be insulated to the level of the false ceiling
as shown in Figure 21. This will help reduce
heat loss from the home around the fireplace.
Figure 20 - Chase Constructions
Figure 21 - Chase Assembly
08/04 27847 Rev H 23
Page 24
2. Chase Top
Construct a chase of desired materials maintaining a
minimum 2 in. air space around the chimney.
3. Termination Cap
a. Install the chimney sections up through the chase
enclosure. When using a TR344 round termination
cap, the uppermost top section of pipe must
extend 6 in. above the top of the chase collar to
allow installation of the storm collar and
termination cap. See Figure 22.
b. For installations utilizing a TR342 telescoping
round termination cap, the uppermost chimney
section must be below the top of the chase top,
but not more than 14-1/2 in. below the top of the
chase top flashing collar. See Figure 23.
HST-38 SERIES INSTALLATION INSTRUCTIONS
Figure 22 - Installing a TR344 Round Termination Cap
Figure 23 - Installing a TR342 Round Telescoping
Termination Cap
24 27847 Rev H 08/04
Page 25
HST-38 SERIES INSTALLATION INSTRUCTIONS
c. For installations utilizing an ST375 square
termination cap the last chimney section must not
be more than 4-1/2 in. below the chase top. See
Figure 24.
d. For installation utilizing a TS345/TS345P Square
Termination Cap, the uppermost chimney section
must not be more than 3 in. below the chase top.
See Figure 25.
e. Attach the chase top (CT35) to the top of the
chase.
f. Install the termination cap following the
instructions provided with it.
Figure 24 - Installing an ST375 Square
Termination Cap
Figure 25 - Installing a TS345/TS345P
Square Termination Cap
WARNING!
Never install a single wall slip section or smoke-pipe in a chase structure. The higher temperature of this
single wall pipe may radiate sufficient heat to combustible chase materials to cause a fire.
WARNING!
Detailed instructions for installation of the chase top, storm collar and termination cap are packaged with
these parts. To avoid danger of fire, all instructions must be strictly followed, including the provision of air
space clearance between chimney system and enclosure. To protect against the effects of corrosion on those
parts exposed to the weather, we recommend that the chase top and termination cap be painted with a rustresistant paint.
08/04 27847 Rev H 25
Page 26
HST-38 SERIES INSTALLATION INSTRUCTIONS
H. OPERATING INSTRUCTIONS
Note: Save and pass this instruction manual to subsequent home owners. The informa-
tion provided is intended to notify and warn them about making unsafe future modifications such as the addition of shelves or the use of unauthorized parts and repairs.
1. General Information
This fireplace is intended to operate as a supplemental
heat source. It is not designed to function as a primary
heat source for a structure.
Fireplaces, as well as other woodburning appliances,
have been used safely for many years. It has been our
experience that most problems are caused by improper
installation and operation of the fireplace. Make certain
that installation and operation of the fireplace system
is in accordance with these instructions.
It is extremely important that the fire be supervised
whenever the fireplace is in use. It is also
recommended that an annual inspection be performed
on the fireplace system to determine if the flue system
needs to be cleaned, or as in the case of any appliance,
if minor repairs are required to maintain the system in
top operating condition.
This factory built fireplace is intended for use with either
solid fuel (firewood) or a decorative gas appliance that
has been tested and listed to the Standard for
Decorative Gas Appliances for Installation in
Vented Fireplaces, ANSI Z21.60. When operating
your fireplace, the flue damper must be in the open
position.
This fireplace was not tested and listed for use with an
unvented gas log heater. Do not install an unvented
gas log heater in this fireplace and operate it with the
flue damper in the closed position unless the unvented
gas log heater has been specifically tested and listed
for use in this fireplace by Underwriters Laboratories
Inc.
Use of an unvented gas log heater in this factory
built fireplace may create a fire hazard that can
result in a structure fire.
2. Outside Air
A source of air (oxygen) is required in order for
combustion to take place. Whatever air is consumed
by the fire must be replaced through cracks around
windows, under doors, etc. Most newly constructed
houses or existing homes fitted with tightly sealed doors
and windows are relatively air tight. In this case, an
outside air source must be made available to feed
combustion air from outside the home.
A damper control handle allows the individual control
of the outside air inlet if your fireplace is equipped with
this option. Use of outside air for combustion is highly
recommended to conserve heated air within the
structure and to provide make up air to keep the
fireplace venting properly.
This fireplace will operate correctly only if adequate
ventilation is provided to allow proper draft to the
fireplace system. Hearth & Home Technologies
assumes no responsibility for the improper
performance of the fireplace system caused by
inadequate draft due to environmental conditions, down
drafts, tight sealing construction of the structure, or
mechanical exhausting devices which create a
negative air pressure within the structure where the
fireplace is located.
CAUTION:
Fireplace operation does require air. Do not take
air from other fuel burning appliances which can
result in improper venting (smoking) or air
dilution. Always provide adequate makeup air.
WARNING!
DO NOT operate this fireplace with the flue
damper in the closed position. Combustion
products must vent up the chimney system to
prevent carbon monoxide poisoning, and to
prevent hot combustion gases from contacting
and overheating combustible surfaces. Failure
to operate this fireplace with the damper in the
open position may result in asphyxiation or a
structure fire.
26 27847 Rev H 08/04
The flue damper must be in a full open position and is
operated by moving the handle up toward the top of
the fireplace. Before lighting the fire, verify this by
looking up from the inside of the fireplace. Always
operate this fireplace with the damper fully open.
Please note: down drafts, obstructions, damaged or
poor (wet) fuels can cause smoke spillage.
3. Flue Damper
Page 27
HST-38 SERIES INSTALLATION INSTRUCTIONS
4. Glass Doors
Most efficient fireplace operation using glass doors is
with the doors open. When the doors are open, the
screen must be closed. Only Hearth & Home
Technologies glass doors may be used. See Figure 26
for proper glass door operation.
Figure 26
Proper Operating Positions of Doors
5. Grate
The factory installed integral grate must be used to
hold the logs from falling out of an open fireplace and
to allow air to pass between the burning logs. It is
important to keep the fire off the hearth and to allow
the ashes to collect beneath the fire, thereby forming
a layer of additional heat protection.
6. Firescreen
A firescreen is always provided to control sparks. It
must be closed whenever the fireplace is in use. Glass
doors or firescreens must not be used to hold burning
material inside the fireplace. Only those glass doors
specifically tested and listed for use with the specific
fireplace model should be used. Screens should be
closed when the glass doors are closed.
CAUTION:
When left closed while burning your fireplace,
firescreens and glass doors will be HOT.
Handle with care!
WARNING!
Do not store fuel within the clearances to combustibles, or in the space required for refueling
and ash removal. See maintenance instructions,
“Clear Space Near the Fireplace”.
7. Wood Fuel
FIREWOOD: Your fireplace performance depends on
the quality of the firewood you use. All seasoned wood,
regardless of species, contains about 8,000 BTU’s per
pound, and hardwoods have a greater density than
soft woods. A piece of hardwood will contain about 60%
more BTU’s than an equal size piece of soft wood.
Firewood is commonly sold by the cord (128 cu. ft.). A
cord of seasoned oak (hardwood) would contain about
60% more potential energy than a cord of seasoned
pine (soft wood).
Soft woods are generally considered coniferous. These
are trees with needle-like leaves that stay green all
year and carry their seeds exposed in a cone.
Examples of soft wood trees are Douglas fir, pine,
spruce, and cedar. Soft woods require less time to dry,
burn faster and are easier to ignite than hardwoods.
Hardwoods are generally considered deciduous.
Deciduous trees are broadleaf trees that lose their
leaves in the fall. Their seeds are usually found within
a protective pod or enclosure. Some examples are oak,
maple, apple, and birch. It should be noted that there
are some deciduous trees that are not considered
hardwoods, such as poplar, aspen, and alder.
Hardwoods require more time to season, burn slower
and are usually harder to ignite than soft woods.
The best wood fuel is a combination of soft wood and
hardwood. Start the fire with soft wood. The fire will
give off quick heat to bring the fireplace up to operating
temperature. Hardwood can then be added for slow,
even heat and longer burn time.
MOISTURE: Regardless of which species of wood you
burn, the single most important factor that effects the
way your fireplace operates is the amount of moisture
in the wood. The majority of the problems fireplace
owners experience are caused by trying to burn wet,
unseasoned wood.
Freshly cut wood can be as much water as it is wood,
having a moisture content of around 50%. Imagine a
wooden bucket that weighs about eight pounds. Fill it
with a gallon of water, put it in the fireplace and try to
burn it. This sounds ridiculous but that is exactly what
you are doing if you burn unseasoned wood.
WARNING!
Burning wet, unseasoned wood can cause excessive creosote accumulation. When ignited
it can cause a chimney fire that may result in a
serious house fire.
08/04 27847 Rev H 27
Page 28
HST-38 SERIES INSTALLATION INSTRUCTIONS
SEASONING: Seasoned firewood is nothing more than
wood that is cut to size, split and air dried to a moisture
content of around 20%. The time it takes to season
wood varies from around nine months for soft woods
to as long as eighteen months for hardwoods. The key
to seasoning wood is to be sure it has been split,
exposing the wet interior and increasing the surface
area of each piece. A tree that was cut down a year
ago and not split is likely to have almost as high a
moisture content now as it did when it was cut.
The following guideline will ensure properly seasoned
wood:
a. Stack the wood to allow air to circulate freely
around and through the woodpile.
b. Elevate the woodpile off the ground to allow air
circulation underneath.
c. The smaller the pieces, the faster the drying
process. Any piece over 6 in. in diameter should
be split.
d. Cover the top of the woodpile for protection from
rain and snow. Avoid covering the sides and ends
completely. Doing so may trap moisture from the
ground and impede air circulation.
The problems with burning wet, unseasoned wood are
twofold: First, you will receive less heat output from
wet wood because it requires energy in the form of
heat to evaporate the water trapped inside. This is
wasted energy that should be used for heating your
home. Secondly, this moisture evaporates in the form
of steam which has a cooling effect in your fireplace
and chimney system. When combined with tar and
other organic vapors from burning wood it will form
creosote which condenses in the relatively cool
fireplace and chimney.
Note: The first three or four fires should be of mod-
erate size to allow the oils and binders to be burned
from the fireplace and the refractory and paint to
cure. You may notice an industrial odor the first few
fires. This is considered normal.
As you use the fireplace, expansion and contraction will cause minor cracking of the refractory. This
is normal, unavoidable, and will not affect the performance of the fireplace. If the cracks become large
enough that the metal behind the refractory is exposed or large pieces fall out, the panels should
be replaced.
CAUTION:
Never use gasoline, gasoline-type lantern fuel,
kerosene, charcoal lighter fluid, or similar
liquids to start or “freshen up” a fire in this
fireplace. Keep all such liquids well away from
the fireplace.
WARNING!
Fireplaces equipped with doors should be operated only with the doors fully open or fully
closed. If doors are left partially open, gas and
flame may be drawn out of the fireplace opening, creating the risk of both fire and smoke.
9. Draft Problems
8. Starting a Fire
Check the flue damper to be certain it is in the full open
position. Place crumpled or twisted paper under the
fireplace grate. Loosely arrange kindling or small
pieces of wood to form a layer above the paper.
The fires must be built on the fireplace grate, without
danger of the burning fuel falling out of the fireplace
opening.
Light the paper and add small pieces of wood until a
hot bed of embers has been established.
After establishing the fire bed, and the small firewood
is burning briskly, add a minimum of three average
sized pieces of split firewood, place the wood in such
a manner to allow combustion air and flames between
them.
28 27847 Rev H 08/04
Note: When first lighting your fireplace, it may be
necessary to pre-warm the flue to establish a draft.
This is done by holding a rolled up piece of burning newspaper under the flue damper for a few moments. This will help reduce smoke spillage during start-up.
This fireplace will operate correctly only if adequate
ventilation is provided to allow proper draft to the
fireplace system. Hearth & Home Technologies
assumes no responsibility for the improper
performance of the fireplace system caused by
inadequate draft due to environmental conditions, down
drafts, tight sealing construction of the structure or
mechanical exhausting devices which will create a
negative air pressure within the structure where the
fireplace is located.
Page 29
HST-38 SERIES INSTALLATION INSTRUCTIONS
Flue draft is measured as negative pressure in the
chimney. The amount of negative pressure determines
how strong the draft is. The draft is important because
it draws the combustion air into the fireplace and pulls
the smoke out of the chimney.
There are three basic criteria essential in establishing
and maintaining flue draft:
• Availability of combustion air.
• Heat generated from the fire.
• Diameter and height of the flue system.
These three factors work together as a system to create
the flue draft. Increasing or decreasing any one of them
will affect the other two and thus change the amount
of draft in the entire system. See Figure 27.
Figure 27 - Flue Draft
If the fire is hard to start and smoke spills out of the
fireplace, or you find it difficult to establish and maintain
a moderately high burn rate, then the flue draft is too
low and corrective measures must be taken.
Be sure you have air available for combustion and
that your firewood is dry and well seasoned. Build
your fires properly and according to the instructions
given in operating instructions, “Starting a Fire”. Be
sure your flue system is installed correctly and that it
is the proper diameter and height. Check for the
following:
• All chimney sections are properly installed and the
joints are tightly sealed.
• The chimney is clean and free of creosote buildup.
• Make sure overhanging trees and branches are
cut back within ten feet of the top of the chimney.
• Ensure the chimney cap is clean and free of any
buildup of soot or creosote.
If you still suspect you have a low draft problem it may
be necessary to increase the volume of air in your flue
system. Since the diameter of your flue system is
matched with the size of the flue collar and should not
be changed, then the height of the system must be
increased. Add chimney sections a little at a time until
the draft improves.
In some cases, regardless of what you do, it can still
be difficult to establish the proper flue draft. This is
especially evident when using an exterior factory built
chimney or exterior masonry chimney. Try placing
several sheets of crumpled paper on top of your kindling
as close to the flue outlet of the fireplace as possible.
Light this paper first then the paper under the kindling.
The heat generated from the rapidly burning paper on
top of the kindling should help get the draft
established.
Still other factors can affect how well your flue system
performs. Neighboring structures, high winds, tall
trees, even hillsides can affect air currents around
the chimney. Well designed chimney caps are
available that can help. Your fireplace dealer is the
local expert in your area. He or she can usually make
suggestions or discover problems that can be easily
corrected allowing your fireplace to operate correctly
as it has been designed, providing safe and
economical heat for your home.
08/04 27847 Rev H 29
Page 30
I. MAINTENANCE INSTRUCTIONS
1. Disposal of Ashes
Ashes should be placed in a metal container with a
tight-fitting lid. The closed container of ashes should
be placed on a noncombustible floor or on the ground,
well away from all combustible materials, pending final
disposal. If the ashes are disposed of by burial in soil
or otherwise locally dispersed, they should be retained
in the closed container until all embers have thoroughly
cooled.
2. Creosote and Soot
Inspect the chimney internally for obstructions and
construction damage. Flue pipe joints and seams must
be continuous and mechanically tight. In a used
chimney, additional inspection is needed for creosote
buildup, which is the formation of a flammable
sediment.
When wood is burned slowly, it produces tar and other
organic vapors, which combine with expelled moisture
to form creosote. The creosote vapors condense in
the relatively cool chimney flue of a slow-burning fire.
As a result, creosote residue accumulates on the flue
lining. When ignited, this creosote makes an extremely
hot fire.
The chimney should be inspected at least twice a year
during the heating season to determine if creosote
buildup has occurred.
If creosote has accumulated, it should be removed
to reduce the risk of a chimney fire.
HST-38 SERIES INSTALLATION INSTRUCTIONS
WARNING!
A chimney fire can permanently damage your
chimney system. This damage can only be repaired by replacing the damaged component
parts. Chimney fires are not covered by the Limited Warranty and Buyer Protection Plan.
3. Chimney Cleaning
If you do detect a buildup of creosote, contact a
qualified chimney sweep or clean it yourself. To do this,
perform the following steps:
a. Open the damper.
b. Hang a damp sheet across the fireplace openings
to stop dirt and soot from entering the room.
c. Remove the termination cap or housing top. See
Figure 28.
d. Clean with a stiff nylon brush attached to a pole
OR tie a small burlap bag filled with straw and
several small stones or sand. Work up and down
the flue until the flue is clean.
e. Replace the termination cap or housing top.
4. Clear Space Near the Fireplace
Combustible materials must not be stored on the hearth
extension. Room furnishings such as drapes, curtains,
chairs, or other combustibles must be at least four feet
from the open front of the fireplace.
Figure 28
Chimney and Termination Cap Cleaning
30 27847 Rev H 08/04
Page 31
HST-38 SERIES INSTALLATION INSTRUCTIONS
INDEX
A
Air Clearance 17, 20
Air Kit Handle Location 18
Attic Insulation Shield 8, 17
B
Building Codes 4, 18, 22
C
Chase 23
Chase Top 9, 24
Chimney
Assembling Sections Through the Roof
18
Checking the Assembly 17
Cleaning 30
Creosote 30
Exit Point Through the Roof 18
Height Requirements 14
Requirements 12
Securing the System 17
Chimney Air Kit 9, 18
Chimney Bracket 8
Chimney Requirements 12
Chimney Sections
Assembling 16
Number Required 14
Chimney Stabilizer 8
Cleaning
Disposal of Ashes 30
CLEARANCES 10
Clearances 20
Codes
Building 14, 18, 22
Electric 19
Gas 20, 26
Combustible
Material 21
Combustible Material 22
Components 5
Construction 21, 24
Creosote 30
D
Damper 26
Description of the Fireplace System 4
Dimensions 6
Draft 28
E
Electric Codes 19
Exhaust Products 10
F
Finishing 22
Fireplace
Enclosure 20
Locations 10
Firescreen 27
Firestop Spacer 8
Installation 16
Firewood 27
Flue 26
Framing 11
Framing the Fireplace 11
Fuel 27
G
Gas Codes 20, 26
General Information 26
Glass Doors 22, 27
Grate 5, 27
H
Hearth Extension 21
Positioning 22
Hearth Strips 15
I
Installation
Fireplace 15
Insulation Shield 8, 17
J
Joint Band 8
L
Leveling the Fireplace 15
Listings and Code Approvals 4
Locations 10
M
Maintenance 30
Mantel 11, 12, 22
Material, Sealant 22
Metal Hearth Strips 15
Moisture Content of Wood 27
N
Negative Air Pressure 28
Noncombustible Material 22
Noncombustible Sealant Material 22
O
Offsets/Returns 13
Outside Air 26
Outside Air Kit 6, 19
Overhead Obstructions 13
P
Positioning 15
Pre-Installation Preparation 10
R
Roof Flashing 8, 18
S
Safety 15
Sealant Material 22
Shroud 9
Sidewalls and Surrounds 12
Sidewalls/Surrounds 12
Smoke 10
Smoke Spillage 26
Soot 30
Space Requirements 10
Standard for Decorative Gas Appliances
20, 26
Starting a Fire 28
T
Ten Foot Rule 14
Termination Cap 9, 24, 25
Trim Kit 5
Typical Fireplace System 4
U
UL 127 Standards 4
Uniform Building Code for Roof Framing
Details 18
Unvented Gas Log Heater 20, 26
V
Ventilation 28
W
Wet Insulation 2
Wood
Moisture of 27
Wood Fuel 27
08/04 27847 Rev H 31
Page 32
WARRANTY
FOR HEAT-N-GLO FIREPLACES
The limited warranty will not become effective until you have mailed the completed warranty card to:
Subject to the conditions set forth herein, Heat-N-Glo extends the following limited warranty with respect to your Heat-N-Glo fireplace,
excluding accessories, Chimney components and Glass Doors.
If Heat-N-Glo is satisfied that any part or portion of the fireplace covered by this warranty is defective in material or workmanship under
normal use and service as described in the operating instructions, Heat-N-Glo will take the following actions:
1. Within the first five (5) years from the date of installation, Heat-N-Glo shall, at its option, replace or repair any
such defect in material or workmanship, at Heat-N-Glo’s expense. HEAT-N-GLO SHALL NOT BE RESPONSIBLE FOR ANY OTHER LABOR COSTS, OR EXPENSES, INCLUDING INDIRECT, INCIDENTAL OR CONSEQUENTIAL DAMAGES.
2. During the sixth (6th) through the (10th) years after the date of installation, Heat-N-Glo shall supply replace-
ment parts or parts at no charge, but SHALL NOT BE RESPONSIBLE FOR ANY LABOR, TRANSPORTATION,
OR OTHER INDIRECT DAMAGES.
3. During the eleventh (11th) through the fifteenth (15th) years after date of installation, Heat-N-Glo will send to
you, FOB its factory, replacement parts (if available) at the current minimum wholesale price, but Heat-N-Glo
SHALL NOT BE RESPONSIBLE FOR ANY LABOR, TRANSPORTATION OR OTHER INDIRECT DAMAGES.
4. During the first six (6) months after installation, HEAT-N-GLO shall, at its option, replace or repair the Glass
Doors and any electrical components, if operation is faulty. (This does not include Glass panels broken during
shipment, misuse or careless handling.) After the first six (6) months, HEAT-N-GLO will sell to you, FOB its
factory, replacement parts at the current list price, but HEAT-N-GLO SHALL NOT BE RESPONSIBLE FOR ANY
LABOR, TRANSPORTATION OR OTHER INDIRECT DAMAGES. IF GLASS DOORS OTHER THAN FACTORY
DOORS ARE USED ALL WARRANTY AND LIABILITY ON THE FIREPLACE IS VOIDED.
Heat-N-Glo may discharge its entire warranty liability by refunding the price of the product.
Products made by other manufacturers, sold with the fireplace or thereafter are not covered by this limited warranty.
This limited warranty will be void if the fireplace is not installed according to the installation instructions. The limited warranty also is void if
the fireplace is not operated, at all times, according to the operating instructions furnished. The limited warranty will also be void if the
fireplace is removed from the place originally installed.
EXCEPT TO THE EXTENT PROVIDED BY LAW, NO IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR
PURPOSE, AND NO IMPLIED WARRANTIES SHALL APPLY TO THE FIREPLACE AFTER THE ABOVE LIMITED WARRANTY HAS EXPIRED.
In states that do not allow limitations on how long implied warranty lasts, or do not allow exclusion of indirect damages, those limitations or
exclusions may not apply to you. You may also have additional rights not covered in this limited warranty.
HEAT-N-GLO reserves the right to make changes at anytime, without notice, in design, material, specifications and prices and the right to
discontinue styles and products.
HEAT-N-GLO FIREPLACES, A DIVISION OF HEARTH & HOME TECHNOLOGIES INC.
20802 Kensington Blvd., Lakeville, MN 55044.
This card must be mailed within 60 days of the fireplace installation.
• ICBOES REPORT NO. 3454
• UNDERWRITERS LABORATORIES FILE NO. MH20450
Feb 2003
32 27847 Rev H 08/04
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