Heatilator Wood Burning Fireplace ST36D User manual

1
Owner’s Manual
Installation and Operation
Models:
ST36D
Wood Burning Fireplace
Installation and service of this  replace
should be performed by quali ed personnel.
Hearth & Home Technologies suggests NFI
certi ed or factory-trained professionals, or
technicians supervised by an
NFI certi ed professional.
Fire Risk
• For use with solid wood fuel or decorative
gas appliance only.
• DO NOT install unvented gas logs.
WARNING
If the information in these instruc-
tions is not followed exactly, a
 re may result causing property
damage, personal injury, or death.
• Do not store or use gasoline or other  am-
mable vapors and liquids in the vicinity of
this or any other appliance.
• Do not over re. Over ring will void your
warranty.
• Comply with all minimum clearances to
combustibles as speci ed. Failure to
comply may cause house  re.
WARNING WARNING
Hot screen/mesh and glass doors will cause burns.
• DO NOT touch screen/mesh or glass doors until
cooled
• NEVER allow children to touch screen/mesh or glass
doors
• Keep children away
• CAREFULLY SUPERVISE children in same room as
 replace.
• Alert children and adults to hazards of high
temperatures.
High temperatures may ignite clothing or other
 ammable materials.
• Keep clothing, furniture, draperies and other
 ammable materials away.
HOT SURFACES!
Screen/mesh, glass doors
and other surfaces are hot
during operation AND cool
down.
DO NOT DISCARD THIS MANUAL
NOTICE
• Important operating
and maintenance
instructions included.
• Leave this manual with
party responsible for
use and operation.
• Read, understand
and follow these
instructions for safe
installation and
operation.
DO NOT
DISCARD
Heatilator • ST36D • 20396 • Rev AG • 7/12

2
Read this manual before installing or operating this replace.
Please retain this owner’s manual for future reference.
Homeowner Reference Information
Model Name: Date purchased/installed:
Serial Number: Location on replace:
Dealership purchased from: Dealer phone:
Notes:
We recommend that you record the following pertinent
information about your replace:
Listing Label Information/Location
The model information regarding your specic replace can be found on the rating plate located on the smoke shield of
the replace.
Congratulations!
Grate Fireplace
Model
Serial
Number
Note: An arrow ( ) found in the text signies change in content.

Heatilator • ST36D • 20396 • Rev AG • 7/12
Congratulations on selecting a Heatilator wood burning
replace. The Heatilator replace you have selected is
designed to provide the utmost in safety and reliability.
As the owner of a new replace, you’ll want to read and
carefully follow all of the instructions contained in this
owner’s manual. Pay special attention to all cautions and
warnings.
This owner’s manual should be retained for future refer-
ence. We suggest you keep it with your other important
documents and product manuals.
Your new Heatilator wood burning replace will give you
years of durable use and trouble-free enjoyment. Wel-
come to the Heatilator family of replace products!
FIREPLACE NO.
MODEL NO.
MODEL NO.
MFG. DATE
WARNING: RISK OF
FIRE DAMAGE. REPLACE
GRATE WITH HEARTH & HOME
TECHNOLOGIES INC.
FIRECHAMBER INTENDED FOR USE WITH HEARTH & HOME TECHNOLOGIES INC. LISTED FIREPLACE PARTS. SEE INSTALLATION AND
OPERATING INSTRUCTIONS FOR THIS MODEL. ONLY HEARTH & HOME TECHNOLOGIES INC. GLASS DOOR KITS CAN BE INSTALLED ON THIS UNIT.
FIREPLACE ALSO FOR USE
IN MANUFACTURED HOMES
YES NO
CLEARANCE TO
COMBUSTIBLES:
CHIMNEY
2 IN. MIN.
FIREBOX
IN.
MIN.
FAN KIT
MODEL NO.
& RATED AT
115 VOLTS, 50/60 Hz., AMP.
DO NOT OVERFIRE. USE ONLY: SOLID WOOD FUEL OR
LISTED DECORATIVE GAS APPLIANCE. DO NOT USE A
FIREPLACE INSERT OR OTHER PRODUCTS NOT
SPECIFIED FOR USE WITH THIS PRODUCT. IF DOORS
ARE USED OPERATE FIREPLACE WITH DOORS FULLY
OPEN OR CLOSED ONLY. WHEN BURNING A
DECORATIVE GAS APPLIANCE IN THE FIREPLACE,
ADJUST DAMPER TO THE FULLY OPEN POSITION.
WARNING! THIS FIREPLACE HAS NOT BEEN TESTED WITH AN UNVENTED
GAS LOG SET. TO REDUCE THE RISK OF FIRE OR INJURY, DO NOT
INSTALL AN UNVENTED GAS LOG SET INTO FIREPLACE.
WARNING! THIS APPLIANCE IS NOT FOR USE AS COOKING EQUIPMENT.
IF INSTALLATION OR OPERATING INSTRUCTIONS ARE MISSING
CONTACT: HEARTH & HOME TECHNOLOGIES INC.,
1915 W. SAUNDERS ST., MT. PLEASANT, IA 52641.

3
Safety Alert Key:
• DANGER! Indicates a hazardous situation which, if not avoided will result in death or serious injury.
• WARNING! Indicates a hazardous situation which, if not avoided could result in death or serious injury.
• CAUTION! Indicates a hazardous situation which, if not avoided, could result in minor or moderate injury.
• NOTICE: Indicates practices which may cause damage to the replace or to property.
!
Table of Contents
Congratulations! 2
Warranty 4
1 Listing and Code Approvals 6
A. Appliance Certication 6
B. Non-Combustible Materials 6
C. Combustible Materials 6
User Guide
2 Operating Instructions 7
A. Your Fireplace 7
B. Seasoned Wood 8
C. Starting a Fire 8
D. Grate 8
E. Firescreen 8
F. Flue Damper 8
G. Refractory 8
H. Glass Doors 9
I. Outside Air (optional) 9
J. Vented Gas Log Sets & Gas Log Lighters 9
K. Optional Components 9
L. Clear Space 9
M. Wood Fuel 10
3 Maintenance and Service 11
A. Disposal of Ashes 11
B. Chimney Inspection/Cleaning 11
C. Check Firebox Refractory 12
D. Inspect Grate 12
E. Glass Cleaning 12
4 Troubleshooting Guide 13
Installer Guide
5 Getting Started 14
A. Typical Fireplace System 14
B. Design and Installation Considerations 15
C. Draft 15
D. Negative Pressure 15
E. Locating Fireplace & Chimney 16
F. Tools and Supplies Needed 17
G. Fireplace System Requirements 17
H. Inspect Fireplace and Components 17
6 Framing & Clearances 18
A. Select Fireplace Location 18
B. Clearances 19
C. Sidewalls/Surrounds 20
D. Frame the Fireplace 20
7 Installation of Fireplace 21
A. Things to Consider 21
B. Position the Fireplace 21
C. Place Protective Metal Hearth Strips 21
D. Level Fireplace 21
E. Install Outside Air Kit 23
8 Chimney Assembly 24
A. Chimney Requirements 25
B. Using Offsets/Returns 26
C. Assemble Chimney Sections 27
D. Install Chimney Air Kit 27
E. Install Ceiling Firestops 28
F. Install Attic Insulation Shield 29
G. Cut out Hole in Roof 30
H. Complete Installation 30
I. Install Flashing 30
J. Chimney Termination Requirements 31
9 Chase Installations 32
A. Construct the Chase 32
B. Install Fireplace & Chimney 33
C. Install Chase Top 33
D. Install Termination Cap 34
10 Shrouds 36
A. Radiation Shield 36
B. Field Constructed Shrouds 36
11 Finishing 38
A. Non-Combustible Materials 38
B. Combustible Materials 38
C. Hearth Extension 38
D. Finishing Material 39
E. Combustible Mantel 40
F. Sidewalls/Surrounds 41
12 Accessories 42
A. Gas Log/Lighter Provision 42
B. Wood Burning Inserts 42
13 Reference Materials 43
A. Fireplace Dimensions 43
B. Optional Components 43
C. Chimney Components 44
D. Service Parts 47
E. Contact Information 48

Heatilator • ST36D • 20396 • Rev AG • 7/12

4
Warranty
4021-645C 12-29-10 Page 1 of 2
Hearth & Home Technologies Inc.
LIMITED LIFETIME WARRANTY
Hearth & Home Technologies Inc., on behalf of its hearth brands (”HHT”), extends the following warranty for
HHT gas, wood, pellet, coal and electric hearth appliances that are purchased from an HHT authorized dealer.
WARRANTY COVERAGE:
HHT warrants to the original owner of the HHT appliance at the site of installation, and to any transferee taking ownership
of the appliance at the site of installation within two years following the date of original purchase, that the HHT appliance
will be free from defects in materials and workmanship at the time of manufacture. After installation, if covered compo-
nents manufactured by HHT are found to be defective in materials or workmanship during the applicable warranty period,
HHT will, at its option, repair or replace the covered components. HHT, at its own discretion, may fully discharge all of its
obligations under such warranties by replacing the product itself or refunding the verified purchase price of the product
itself. The maximum amount recoverable under this warranty is limited to the purchase price of the product. This warranty
is subject to conditions, exclusions and limitations as described below.
WARRANTY PERIOD:
Warranty coverage begins on the date of original purchase. In the case of new home construction, warranty coverage
begins on the date of first occupancy of the dwelling or six months after the sale of the product by an independent,
authorized HHT dealer/ distributor, whichever occurs earlier. The warranty shall commence no later than 24 months
following the date of product shipment from HHT, regardless of the installation or occupancy date. The warranty period for
parts and labor for covered components is produced in the following table.
The term “Limited Lifetime” in the table below is defined as: 20 years from the beginning date of warranty coverage for
gas appliances, and 10 years from the beginning date of warranty coverage for wood, pellet, and coal appliances. These
time periods reflect the minimum expected useful lives of the designated components under normal operating conditions.
See conditions, exclusions, and limitations on next page.
Parts Labor Gas Wood Pellet EPA
Wood
Coal Electric Venting
XXXXXXX
All parts and material except as
covered by Conditions,
Exclusions, and Limitations
listed
XXX Igniters, electronic components,
and glass
XXXXX Factory-installed blowers
XMolded refractory panels
XFirepots and burnpots
5 years 1 year XX Castings and baffles
7 years 3 years XXX Manifold tubes,
HHT chimney and termination
10
years
1 year X Burners, logs and refractory
Limited
Lifetime
3 yearsXXXXX Firebox and heat exchanger
XXXXXXX All replacement parts
beyond warranty period
Warranty Period HHT Manufactured Appliances and Venting
1 Year
Components Covered
3 years
2 years
90 Days
Heatilator • ST36D • 20396 • Rev AG • 7/12

5
4021-645C 12-29-10 Page 2 of 2
WARRANTY CONDITIONS:
• This warranty only covers HHT appliances that are purchased through an HHT authorized dealer or distributor. A list of
HHT authorized dealers is available on the HHT branded websites.
• This warranty is only valid while the HHT appliance remains at the site of original installation.
• Contact your installing dealer for warranty service. If the installing dealer is unable to provide necessary parts, contact
the nearest HHT authorized dealer or supplier. Additional service fees may apply if you are seeking warranty service
from a dealer other than the dealer from whom you originally purchased the product.
• Check with your dealer in advance for any costs to you when arranging a warranty call. Travel and shipping charges
for parts are not covered by this warranty.
This warranty is void if:
• The appliance has been over-fired or operated in atmospheres contaminated by chlorine, fluorine, or other damaging
chemicals. Over-firing can be identified by, but not limited to, warped plates or tubes, rust colored cast iron, bubbling,
cracking and discoloration of steel or enamel finishes.
• The appliance is subjected to prolonged periods of dampness or condensation.
• There is any damage to the appliance or other components due to water or weather damage which is the result of, but
not limited to, improper chimney or venting installation.
LIMITATIONS OF LIABILITY:
• The owner’s exclusive remedy and HHT’s sole obligation under this warranty, under any other warranty, express or
implied, or in contract, tort or otherwise, shall be limited to replacement, repair, or refund, as specified above. In no
event will HHT be liable for any incidental or consequential damages caused by defects in the appliance. Some states
do not allow exclusions or limitation of incidental or conseque
ntial damages, so these limitations may not apply to you.
This warranty gives you specific rights; you may also have other rights, which vary from state to state. EXCEPT TO
THE EXTENT PROVIDED BY LAW, HHT MAKES NO EXPRESS WARRANTIES OTHER THAN THE WARRANTY
SPECIFIED HEREIN. THE DURATION OF ANY IMPLIED WARRANTY IS LIMITED TO DURATION OF THE
EXPRESSED WARRANTY SPECIFIED ABOVE.
WARRANTY EXCLUSIONS:
This warranty does not cover the following:
• Changes in surface finishes as a result of normal use. As a heating appliance, some changes in color of interior and
exterior surface finishes may occur. This is not a flaw and is not covered under warranty.
• Damage to printed, plated, or enameled surfaces caused by fingerprints, accidents, misuse, scratches, melted items,
or other external sources and residues left on the plated surfaces from the use of abrasive cleaners or polishes.
• Repair or replacement of parts that are subject to normal wear and tear during the warranty period. These parts
include: paint, wood, pellet and coal gaskets, firebricks, grates, flame guides, light bulbs, batteries and the discolor-
ation of glass.
• Minor expansion, contraction, or movement of certain parts causing noise. These conditions are normal and com-
plaints related to this noise are not covered by this warranty.
• Damages resulting from: (1) failure to install, operate, or maintain the appliance in accordance with the installation
instructions, operating instructions, and listing agent identification label furnished with the appliance; (2) failure to
install the appliance in accordance with local building codes; (3) shipping or improper handling; (4) improper opera-
tion, abuse, misuse, continued operation with damaged, corroded or failed components, accident, or improperly/
incorrectly performed repairs; (5) environmental conditions, inadequate ventilation, negative pressure, or drafting
caused by tightly sealed constructions, insufficient make-up air supply, or handling devices such as exhaust fans or
forced air furnaces or other such causes; (6) use of fuels other than those specified in the operating instructions; (7)
installation or use of components not supplied with the appliance or any other components not expressly authorized
and approved by HHT; (8) modification of the appliance not expressly authorized and approved by HHT in writing;
and/or (9) interruptions or fluctuations of electrical power supply to the appliance.
• Non-HHT venting components, hearth components or other accessories used in conjunction with the appliance.
• Any part of a pre-existing fireplace system in which an insert or a decorative gas appliance is installed.
• HHT’s obligation under this warranty does not extend to the appliance’s capability to heat the desired space. Informa-
tion is provided to assist the consumer and the dealer in selecting the proper appliance for the application. Consider-
ation must be given to appliance location and configuration, environmental conditions, insulation and air tightness of
the structure.
Heatilator • ST36D • 20396 • Rev AG • 7/12

6
1 Listing and Code Approvals
NOTICE: This fireplace is tested and approved as a
decorative replace. It should not be factored as a primary
heat source in residential heating calculations.
WARNING! Risk of Fire! Hearth & Home Technologies
disclaims any responsibility for, and the warranty and
agency listing will be voided by the following actions.
DO NOT:
• install or operate damaged replace
• modify replace
• install other than as instructed by Hearth & Home
Technologies
• operate the replace without fully assembling all
components
• overre
• install an unvented gas log set
• install any component not approved by Hearth &
Home Technologies
• install parts or components not Listed or approved
Improper installation, adjustment, alteration, service or
maintenance can cause injury or property damage. For
assistance or additional information, consult a qualied
installer, service agency or your dealer.
B. Non-Combustible Materials
• Materials which will not ignite and burn, composed of
any combination of the following:
- Steel - Iron
- Brick - Tile
- Concrete - Slate
- Glass - Plasters
• Materials reported as passing ASTM E 136, Standard
Test Method for Behavior of Metals, in a Vertical Tube
Furnace at 750° C
C. Combustible Materials
• Materials made of or surfaced with any of the following
materials:
- Wood - Compressed paper
- Plant bers - Plastic
• Any material that can ignite and burn; ame proofed or
not, plastered or un-plastered
Heatilator • ST36D • 20396 • Rev AG • 7/12
A. Appliance Certication
This replace may be installed in sleeping rooms EX-
CEPT in manufactured homes. If installed with a gas log
set, provisions for the National Fuel Gas Code must be
met.
This replace has been tested and listed for use with the
optional components specied in this manual. These op-
tional components may be purchased separately and in-
stalled at a later date. Installation of an outside air kit will
require signicant reconstruction and is best if installed at
the time of replace installation.
Heatilator is a registered trademark of Hearth & Home
Technologies Inc.
This replace system has been tested and listed in accor-
dance with UL 127 and ULC-S610 standards by Under-
writers Laboratories Inc. for installation and operation in
the United States and Canada.

7
2 Operating Instructions
WARNING! DO NOT operate  replace before reading and understanding operating instructions. Failure to operate  replace
according to operating instructions could cause  re or injury.
User Guide
WARNING
Hot glass will cause burns.
• DO NOT touch glass until it is cooled
• NEVER allow children to touch glass
• Keep children away
• CAREFULLY SUPERVISE children in same room as  replace.
• Alert children and adults to hazards of high temperatures.
High temperatures may ignite clothing or other  ammable materials.
• Keep clothing, furniture, draperies and other  ammable materials away.
HOT SURFACES!
Glass and other surfaces are hot during operation AND cool down.
Figure 2.1 General Operating Parts
A. Your Fireplace
If you expect that children may come into contact with this  replace, we recommend a barrier such as a decorative
screen. See your dealer for suggestions.
Heatilator • ST36D • 20396 • Rev AG • 7/12

8
• The rst three or four res should be of moderate size to
allow the oils and binders to be burned from the replace
and the refractory and paint to cure. You may notice
an industrial odor the rst few res. This is considered
normal.
• Use well-seasoned wood.
• Open the ue damper to a fully open position.
• Place crumpled or twisted paper under the replace
grate.
• Loosely arrange kindling or small pieces of wood to form
a ‘tent’ on the replace grate.
• Pre-warm the ue to establish a draft to help reduce
smoke spillage during start-up. Hold a rolled up piece
of burning newspaper under the ue damper for a few
moments.
• Light the crumpled paper to ignite the kindling.
• Add small pieces of wood until a hot bed of embers has
been established.
• Add a minimum of three average size pieces of split
rewood, placed to allow combustion air and ames
between them.
C. Starting a Fire
NOTICE: You must establish a good draft to prevent smoke
spillage into the room.
WARNING! Risk of Fire! Keep combustible materials,
gasoline and other ammable vapors and liquids clear of
the replace.
DO NOT:
• store ammable materials close to the replace
• use gasoline, lantern fuel, kerosene, charcoal lighter
uid or similar liquids to start or “freshen up” a re in this
replace.
Keep all ammable liquids well away from the replace while
it is in use. Combustible materials may ignite.
B. Seasoned Wood
Properly seasoned wood is important for successful
operation of your replace. Most woodburning replace
problems are caused by burning wet, unseasoned wood.
Seasoned rewood is wood that is cut to size, split and air
dried to a moisture content of around 20%.
Imagine a wooden bucket that weighs about eight
pounds. Fill it with a gallon of water, put it in the replace
and try to burn it. This sounds ridiculous but that is exactly
what you are doing if you burn unseasoned wood.
A tree 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.
Please refer to Section 2.M. for more detail.
CAUTION! Odors and vapors released during initial
operation may be irritating to sensitive individuals.
Open windows for air circulation.
D. Grate
This replace is designed to be used with the grate sup-
plied with this unit or one approved by HHT. The grate will
break down over time and will need occasional replace-
ment.
WARNING! Risk of Fire! Use only the factory-supplied
integral grate.
• Keeps logs in place.
• Allows proper air circulation around the re.
E. Firescreen
The rescreen is provided to control sparks. Keep it
closed when the replace is in use.
WARNING! Risk of Fire or Burns!
• Screen will not prevent burning materials from falling
out.
• Screen pulls or handles may be hot.
F. Flue Damper
• Refer to Figure 2.1 for location of control.
• Must be in fully open position (handle up toward the top
of the replace) during operation of the replace.
• Before lighting the replace, verify fully open position by
looking up from the inside of the replace.
WARNING! Risk of Fire and Asphyxiation! Open
damper prior to operating replace. A closed damper
overres the replace and spills smoke and ames
into the room.
G. Refractory
• The refractory is supplied to contain heat and provide
an attractive interior.
• It will break down over time and will need occasional
replacement. Small hairline cracks and discoloration are
normal and do not affect its safety.
• (See refractory maintenance Section 3.C.)
WARNING! Risk of Fire! DO NOT burn replace with-
out refractory. Use only refractory supplied by Hearth &
Home Technologies, Inc.
Heatilator • ST36D • 20396 • Rev AG • 7/12

9
INCORRECT CORRECT
INCORRECT CORRECT
Figure 2.2 Operating Positions of Bi-fold Doors
WARNING! Risk of Fire and Smoke! Fireplaces
equipped with doors should be operated only with
doors fully open or doors fully closed. If doors are left
partly open, gas and ame may be drawn out of the
replace opening.
I. Outside Air (optional)
The outside air kit supplies some combustion air for your
replace. It may help reduce the effects of negative air
pressure. (See Section 5.D.)
• Refer to Figure 2.1 for location of control
• Close the inlet to prevent cold drafts when the replace
is not being used.
CAUTION! Risk of Burns! The outside air control
handle is HOT when replace is in operation. Adjust
BEFORE lighting re.
WARNING! Risk of Fire! Install ONLY doors ap-
proved by Hearth & Home Technologies, Inc.
• Glass doors are optional.
• Refer to Figure 2.2 for how to properly use them.
H. Glass Doors
48 in. (1219 mm)
Clear Space
Front of Fireplace
12 in. (305 mm)
Clear Space
Sides of Fireplace
(from the FP
opening)
Figure 2.3 Clear Space
J. Vented Gas Log Sets & Gas Log Lighters
• Optional
• Vented gas logs or gas log lighters can be installed in
this replace. Follow the instructions provided with the
accessory for operation.
K. Optional Components
• Other options may be available
• Consult your dealer/distributor
L. Clear Space
• Do not place combustible objects within areas indicated
in Figure 2.3.
WARNING! DO NOT place combustible objects in front
of the replace. High temperatures may ignite clothing,
furniture or draperies.
• Mantel - avoid placing candles and other heat-sensitive
objects on mantel or hearth. Heat may damage these
objects.
WARNING! Risk of Fire or Asphyxiation!
• DO NOT install unvented gas logs.
• Damper must be locked open.
• Gas ame may generate fumes.
WARNING! Risk of Fire! DO NOT install and or use
any component not approved by Hearth & Home Tech-
nologies Inc.
Heatilator • ST36D • 20396 • Rev AG • 7/12

10
M. Wood Fuel
Hardwood vs Softwood
Your replace performance depends on the quality of the
rewood you use.
• Seasoned wood contains about 8,000 BTUs per pound
.
• Hard woods are more dense than soft woods.
• Hard woods contain 60% more BTUs than soft woods.
• Hard woods require more time to season, burn slower
and are harder to ignite.
• Soft woods require less time to dry, burn faster and are
easier to ignite.
• Start the re with soft wood to bring the replace up to
operating temperature and to establish draft.
• Add hard wood for slow, even heat and longer burn
time.
The majority of the problems replace owners experience
are caused by trying to burn wet, unseasoned wood.
• Wet, unseasoned wood requires energy to evaporate
the water instead of heating your home, and
• Evaporating moisture cools your chimney, accelerating
formation of creosote.
WARNING! Risk of Fire!
• DO NOT burn wet or green wood.
• Wet, unseasoned wood can cause accumulation of
creosote.
Moisture
Soft woods Hard woods
• Douglas Fir • Oak
• Pine • Maple
• Spruce • Apple
• Cedar • Birch
• Poplar
• Aspen
• Alder
Storing Wood
Steps to ensure properly seasoned wood:
• Stack wood to allow air to circulate freely around and
through woodpile.
• Elevate wood pile off ground to allow air circulation
underneath.
• Smaller pieces of wood dry faster. Any piece over 6 in.
(152 mm) in diameter should be split.
• Wood (whole or split) should be stacked so both ends
of each peice are exposed to air. More drying occurs
through the cut ends than the sides.
• Store wood under cover to prevent water absorbtion
from rain or snow. Avoid covering the sides and ends
completely.
Seasoned Wood
• Cut logs to size
• Split to 6 in. (152 mm) or less
• Air dry to a moisture content of around 20%
- Soft wood - about nine months
- Hard wood - about eighteen months
NOTICE: Seasoning time may vary depending on drying
conditions.
WARNING! Fire Risk! DO NOT store wood:
• In front of the replace.
• In space required for loading or ash removal.
Processed Solid Fuel Firelogs
Manufactured relogs may be used with this replace.
Hearth & Home Technologies Inc. recommends the use of
UL Classied processed fuel relogs. Follow the manufac-
turer’s lighting and safety instructions.
Using relogs may require more frequent chimney inspec-
tion and cleaning.
Do not poke or stir the logs while they are burning. Use
only relogs that have been evaluated for the application
in manufactured replaces and refer to relog warnings
and caution markings on packaging prior to use.
Heatilator • ST36D • 20396 • Rev AG • 7/12

11
3 Maintenance and Service
Figure 3.1 Chimney & Termination Cap Cleaning
A. Disposal of Ashes
Frequency: When they reach bottom of grate
By: Homeowner
WARNING! Risk of Fire! Ashes could contain hot em-
bers.
• Place ashes in a metal container with a tight-tting lid.
• The closed container should be placed on a non-
combustible 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 until all cinders have thoroughly cooled.
B. Chimney Inspection/Cleaning
Frequency: At least twice a year during heating season
or as recommended by a certied chimney sweep
By: Certied chimney sweep
WARNING! Risk of Fire! Ignited creosote is extremely
HOT. Prevent creosote buildup.
Refer to Figure 3.1 to remove/reinstall termination caps.
Creosote - Formation and Need for Removal
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 rela-
tively cool chimney ue of a slow-burning re. As a result,
creosote residue accumulates on the ue lining. When
ignited this creosote makes an extremely hot re.
WARNING! Risk of Fire! A chimney re can permanently
damage your chimney system and nearby structures.
In the event of a chimney re, Hearth & Home Technolo-
gies Inc. recommends
• replacement of the chimney, and
• inspection of the adjacent structure to the provisions of
NFPA Level III inspection criteria.
The chimney shall be inspected at least twice a year
during the heating season to determine when a creosote
buildup has occurred.
When creosote has accumulated it shall be removed to
reduce the risk of a chimney re.
Heatilator • ST36D • 20396 • Rev AG • 7/12
TOP TOP
SCREW
DT SERIES
SCREW
Chimney
Remove 4 screws
and lift top pan off.
Cap
Slip
Section
ST375
Square
Termination Cap
Cap
Remove screws,
lift top cover.
Top Cover
TR344/TR342
Round
Termination Cap
Chase
Cap
1. Remove the 4 screws.
2. Remove the screen.
3. Remove the baffle.
TS345/TS345P
Square
Termination Caps
TCT375
Terra Cotta
Termination Cap
Remove 2 screws from
the front and back and
lift the top off.
1. Remove (8) screws
2. Lift Top off

12
C. Check Firebox Refractory
Frequency: After each ash removal
By: Homeowner
D. Inspect Grate
Frequency: After each ash removal
By: Homeowner
Inspect grate for:
• Warping or sagging 1-1/2 in. (38 mm) or more
• Broken welds
• Burn-through of grate bars
For safe operation, replace only with an approved grate
from Hearth & Homes Technologies Inc.
WARNING! Risk of Fire! Inspect replace refractory.
Crumbling, deteriorated refractory can allow overheating
of surrounding materials.
Expansion and contraction will cause minor cracking of
the refractory. This is normal. The refractory will require
periodic replacement depending on use.
The panels should be replaced if
• Cracks exceed ¼ inch (6 mm) in width,
• Metal is exposed behind the refractory,
• Large pieces of refractory fall out.
E. Glass Cleaning
Frequency: As desired
By: Homeowner
Clean glass with a non-abrasive commercially available
cleaner or ashes:
• Light deposits
- Use household glass cleaner
• Heavy deposits
- Use wood ash on damp cloth or,
- Use commercial replace glass cleaner (consult with
your dealer)
CAUTION! Handle glass assembly with care. Glass is
breakable.
• Avoid striking, scratching or slamming glass
• Avoid abrasive cleaners
• DO NOT clean glass while it is hot
Heatilator • ST36D • 20396 • Rev AG • 7/12

13
4 Troubleshooting Guide
Start Fire Problems Possible Cause Solution
Can’t get re started
Excessive smoke or spillage
Burns too slowly
Smolders, sizzles
Not enough kindling/paper or no
kindling/paper
Use dry kindling, more paper. Arrange kindling &
wood for air movement.
Damper closed/not fully open Open damper.
Not enough air for re to ignite Check for restricted cap/shroud.
Open air kit (if installed).
Check for ue blockage.
Pre-warm ue before starting re (refer to starting
re section).
Check for adequate vent height (refer to chimney
assembly section).
Open window below the replace towards the
wind.
Wood condition is too wet, too
large
Use dry, seasoned wood (refer to wood fuel
section).
Bed of coals not established
before adding wood
Start with paper & kindling to establish bed of
coals (refer to starting re section).
Flue blockage such as birds’
nests or leaves in termination
cap
Have chimney inspected for creosote and cleaned
by a certied chimney sweep.
Down draft or negative pressure
Competition with exhaust
devices
Do not use exhaust fans during start-up (refer to
negative pressure section).
Open window below the replace towards the
wind.
Fire burns too fast Extremely dry or soft wood Mix in hardwood.
Mix in less seasoned wood after re is established
(refer to wood fuel section).
No glass doors Add glass doors to slow down air ow.
Overdrafting Check for correct vent height; too much vertical
height creates overdrafting.
Check location of vent termination (refer to
chimney assembly section).
Heatilator • ST36D • 20396 • Rev AG • 7/12

14
5 Getting Started
A. Typical Fireplace System
Installer Guide
Heatilator • ST36D • 20396 • Rev AG • 7/12
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Place unit, then outline and fill
with white. Move behind the unit
and group/ Delete this note.
Non-combustible
roof flashing maintains
minimum clearance
around chimney
Additional lateral
support for chimney
above roof (or enclosed
in chase) if needed
(Section 8)
Ceiling firestop
on floor of attic
(Section 8)
Support straps
on rafter support
chimney (not shown)
Termination cap
(Section 8 & 9)
Chimney penetrates roof
preferably without affecting
roof rafters (Section 9)
Offset & Return (with hanger straps)
(Section 8)
Framing headed off
in ceiling joists
(Section 8)
Enclosed space above
and around fireplace
(Section 6)
Mantel and surround
(Section 11)
Decorative facing
and trim
(Section 11)
Hearth extension
(Section 11)
Factory-built fireplace
Protective metal
hearth strip(s)
(Section 7)
Outside
combustion air
(Section 7)
Combustible framing/header
on top of V-shaped standoffs
(Section 6)
Chimney system
(Section 8)
Attic insulation shield (not shown)
must be used here to keep
insulation away from chimney
if attic is insulated (Section 8)
Storm Collar
(Section 8)
NOTICE:
• Illustrations and photos reflect typical installations
and are for design purposes only.
• Illustrations/diagrams are not drawn to scale.
• Actual product may vary from pictures in manual.
Chimney Air Kit
(Section 8)
Required in
Canada. Outlet
must be no
less than 6 ft.
(1.83m) off
ground level.
Figure 5.1 Typical Fireplace System

15
Negative pressure results from the imbalance of air avail-
able for the replace to operate properly. It can be stron-
gest in lower levels of the house.
Causes include:
• Exhaust fans (kitchen, bath, etc.)
• Range hoods
• Combustion air requirements for furnaces, water heaters
and other combustion appliances
• Clothes dryers
• Location of return-air vents to furnace or air
conditioning
• Imbalances of the HVAC air handling system
• Upper level air leaks such as:
- Recessed lighting
- Attic hatch
- Duct leaks
To minimize the effects of negative air pressure:
• Install the outside air kit with the intake facing prevailing
winds during the heating season
• Ensure adequate outdoor air for all combustion
appliances and exhaust equipment
• Ensure furnace and air conditioning return vents are not
located in the immediate vicinity of the replace
• Avoid installing the replace near doors, walkways or
small isolated spaces
• Recessed lighting should be a “sealed can” design
• Attic hatches weather stripped or sealed
• Attic mounted duct work and air handler joints and seams
taped or sealed
• Basement installations should be avoided
WARNING! Risk of Asphyxiation! Negative pressure
can cause spillage of combustion fumes and soot. Fire
must draft properly for safe operation.
NOTICE: Hearth & Home Technologies Inc. recommends
the use of direct vent replaces in basements.
D. Negative PressureB. Design and Installation Considerations
Draft is the pressure difference needed to vent replaces
successfully. When a replace is drafting successfully, all
combustion byproducts are exiting the home through the
chimney.
Considerations for successful draft include:
• Preventing negative pressure
• Location of replace and chimney
Before installing, determine the following:
• Where the replace is to be installed
• The vent system conguration to be used
• Gas supply piping
• Electrical wiring
• Framing and nishing details
• Whether optional accessories—devices such as a fan,
wall switch or remote control —are desired
NOTICE: Check building codes prior to installation.
• Installation MUST comply with local, regional, state and
national codes and regulations.
• Consult insurance carrier, local building inspector, re
ofcials or authorities having jurisdiction over restrictions,
installation inspection and permits.
NOTICE: Hearth & Home Technologies assumes no
responsibility for the improper performance of the replace
system caused by:
• Inadequate draft due to environmental conditions
• Downdrafts
• Tight sealing construction of the structure
• Mechanical exhausting devices
• Improper location of the chimney
C. Draft
NOTICE: Junction box should be installed during initial
setup to avoid major reconstruction.
Heatilator • ST36D • 20396 • Rev AG • 7/12

16
Marginal Location:
• Below peak
Location NOT recommended:
• Not the highest point of the roof
• Wind loading possible
Multi-level Roofs
Windward
Leeward
Recommended Location:
• Above peak
Recommended:
• Insulated exterior chase
in cooler climates
Recommended Location:
• Above peak
• Inside heated space
Location NOT recommended:
• Too close to tree
• Below adjacent structure
• Lower roof line
• Avoid outside wall
Marginal Location:
• Wind loading possible
Figure 5.2 Recommended Chimney Locations
E. Locating Fireplace & Chimney
Location of the replace and chimney will affect perfor-
mance.
• Install within the warm airspace enclosed by the building
envelope. This helps to produce more draft, especially
during lighting and die-down of the re.
• Penetrate the highest part of the roof. This minimizes
the effects of wind loading.
• Locate termination cap away from trees, adjacent
structures, uneven roof lines and other obstructions.
• Minimize the use of chimney offsets.
• Consider the replace location relative to oor and ceiling
and attic joists.
• Take into consideration the termination requirements in
Section 8 and Section 9.
NOTICE: Locating the replace in a basement or in a location
of considerable air movement can cause intermittent smoke
spillage from replace. Do not locate replace near
• frequently open doors
• central heat outlets or returns
Heatilator • ST36D • 20396 • Rev AG • 7/12

17
Before beginning the installation be sure the following
tools and building supplies are available:
Reciprocating saw Framing material
Pliers Non-combustible sealant
Hammer Gloves
Phillips screwdriver Framing square
Flat blade screwdriver Electric drill and bits
Plumb line Safety glasses
Level Tape measure
1/2-3/4 in. length, #6 or #8 self-drilling screws
Misc. screws and nails
F. Tools and Supplies Needed H. Inspect Fireplace and Components
WARNING! Risk of Fire and/or Explosion! Damaged
parts could impair safe operation. DO NOT install dam-
aged, incomplete or substitute components. Keep re-
place dry.
• Remove replace and components from packaging and
inspect for damage.
• Vent system components and doors are shipped in
separate packages.
• Report to your dealer any parts damaged in shipment.
• Read all the instructions before starting the
installation. Follow these instructions carefully
during the installation to ensure maximum safety
and benet.
G. Fireplace System Requirements
This replace system requires:
• Hearth Refractory
• Grate Assembly
• Outside Air Hood
- Duct must be installed, but sold separately.
Heatilator • ST36D • 20396 • Rev AG • 7/12

18
6 Framing & Clearances
52 in.
(1321 mm)
36 in.
(914 mm)
16 in. (406 mm)
(hearth
extension)
48 in.
(1219 mm)
12 in. (305 mm)
min. to
perpendicular
wall.
Figure 6.1 Fireplace Locations
A. Select Fireplace Location
Heatilator • ST36D • 20396 • Rev AG • 7/12

19
B. Clearances
WARNING! Risk of Fire! You must comply with all minimum air space clearances to combustibles as specied in Fig-
ure 6.2. DO NOT pack required air spaces with insulation or other materials.
Heatilator • ST36D • 20396 • Rev AG • 7/12
(insulation)
0 in. to level
of standoffs
Attic
Insulation
Shield
(ceiling)
(roof)
(attic)
(ceiling)
Ceiling Firestop
Offset/Return (secured
with hanger straps)
Storm Collar
Roof Flashing
1/2 in. (13 mm) to back &
sides of appliance
Must have 2 in. (51 mm)
minimum clearance
to header
0 in.
to floor
2 in. (51 mm) min.
Shaded areas
represent
2 in. (51 mm) min.
air space clearance
required around pipe
Combustible Object
48 in.
1219 mm
Figure 6.2 Clearances to Combustible Materials
Note: Chimney air kit is not shown, but is required in Canada.

20
40 in.
[1016 mm]
36 in.
[914 mm]
12 in.
[305 mm]
9 3/4 in.
[248 mm]
12 in.
[305 mm]
12 in.
[305 mm]
Grid represents 1 in. (25 mm) squares
FLUSH
FRONT
4 in.
[102 mm]
BRICK
FRONT
50° angle
39° angle
D. Frame the Fireplace
Figure 6.4 shows typical framing using combustible materials (2x4 lumber shown).
• Observe all required air space clearances to combustible materials as shown in Figure 6.1 & 6.2.
• Framing across the top of replace must be above top standoffs.
You must maintain
2 in. (51 mm) min. air space
clearance from the
chimney to the
enclosure.
23 in.
(584 mm)
Note: Fireplace
Header cannot be
positioned until after
the fireplace assembly
is in place.
41 in.
(1041 mm)
Figure 6.4 Framing the Fireplace
C. Sidewalls/Surrounds
• Adjacent combustible sidewalls must be located a minimum of 12 in. (305 mm) from the replace opening.
• Combustible and non-combustible mantel legs, surrounds and stub walls may be constructed within the gridded area,
Figure 6.3.
Figure 6.3 Mantel Leg or Wall Projections (Acceptable on both sides of opening)
Heatilator • ST36D • 20396 • Rev AG • 7/12