HearthStone TUCSON 8745 User manual

OWNER’S MANUAL
TUCSONGas-Fired Vent-Free
Heater (8745)
Manufactured by
HearthStone
317 Stafford Avenue
Morrisville, Vermont 05661
READ THIS OWNER’S MANUAL
Operate and maintain this gas heater according to instructions in this manual. Read this manual in its
entirety.
WARNING
If the information in this manual is not followed exactly, a fire or explosion may result, causing property
damage, personal injury or loss of life.
Do not store or use gasoline or other flammable vapors and liquids in the vicinity of this or any other
appliance.
Installation and service must be performed by a qualified installer, service agency or the gas supplier.
This is an un-vented gas-fired heater. It uses air (oxygen) from the room in which it is installed.
Provisions for adequate combustion and ventilation air must be provided. Refer to page 6 of this
manual.
FOR YOUR SAFETY -WHAT TO DO IF YOU SMELL GAS
* DO NOT ATTEMPT TO LIGHT THIS GAS HEATER OR ANY APPLIANCE
* EXTINGUISH ANY OPEN FLAME
* DO NOT TOUCH ANY ELECTRICAL SWITCH
* DO NOT PLUG IN OR UNPLUG ANY APPLIANCE
* DO NOT USE ANY PHONE IN YOUR BUILDING
* OPEN WINDOWS IN THE ROOM AND VACATE THE BUILDING
* TURN OFF THE MAIN GAS SUPPLY
* IMMEDIATELY CALL YOUR GAS SUPPLIER FROM A NEIGHBOR’S PHONE
* FOLLOW THE GAS SUPPLIERS INSTRUCTIONS
* IF YOU CANNOT REACH YOUR GAS SUPPLIER, CALL THE FIRE DEPARTMENT
6400-40440 05-22-03

INFORMATION SHEET
Record, on this page, all relevant information concerning the purchase, installation, and maintenance of
your Tucson gas-fired heater. This information will facilitate servicing, purchase of replacement parts, and
warranty claims (if necessary). Keep your original receipt in a safe place as proof of purchase.
Serial Number:
Fuel type (check one) Natural Gas
Liquid Propane
Sold by:
Phone: Date of Purchase:
Installed by:
Phone: Date of Installation:
Gas Supplier:
Phone:
Read this Owner’s Manual before installing or operating the Tucson gas-fired heater. Retain this manual for
future reference.
SERVICE RECORD
Date Who Performed Work Work Performed Notes
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WHAT WHEN
Firebox Cleaning............. annually

OWNER’S MANUAL MODEL: 8745 TUCSON Vent-Free HEATER
INTRODUCTION
Welcome
Congratulations on the purchase of your
HearthStone Tucson Gas-Fired Vent-Free Stove.
The Tucson incorporates the latest in energy and
gas technology, which will provide you with
clean, efficient heat for years to come. The
combination of natural stone and cast iron gives
the Tucson years of attractive looks and allows
for durable performance, which can be
maintained with minimal care.
If there are any questions regarding installation or
operation, which are not answered within this
manual, contact your local dealer or your
building inspector.
Your Tucson is equipped with a standing pilot
which:
1) generates a millivolt signal that powers the
wall-mounted thermostat and;
2) lights the main burner when the thermostat
calls for heat. (The Tucson requires no electrical
power source for normal operation).
This unit is equipped with a variable output
control located on the gas control valve. It allows
you to vary the heat output, along with the flame
height, to suit personal needs. Heat output can be
reduced during the Fall and Spring (when the
need for heat is reduced) and increased during
Winter months (when the need for heat is the
greatest). Regardless of how you set the variable
output control, the on/off cycling of the unit may
be controlled by the wall-mounted thermostat, or
the on/off/Tstat switch.
The Tucson will provide you with years of
practical and convenient service. However, as
with any gas appliance, the unit must be properly
installed and maintained by qualified service
personnel to ensure safe and trouble-free
operation.
Table of Contents
READ THIS OWNER’S MANUAL ............1
SERVICE RECORD.....................................2
SAFETY INFORMATION...........................4
CLEARANCES TO COMBUSTIBLES .......6
FRESH AIR REQUIREMENTS...................7
DETERMINING SPACE
CLASSIFICATION ......................................7
ELECTRICAL CONNECTIONS...............11
GAS SUPPLY & CONNECTIONS............12
LOG SET INFORMATION........................13
BEFORE THE STOVE IS LIT...................14
HOW TO TURN THE UNIT ON & OFF...15
BURNER FLAME APPEARANCE...........16
INITIAL ADJUSTMENTS.........................17
DAILY OPERATION.................................17
ROUTINE MAINTENANCE AND CARE18
PARTS LIST...............................................19
READ THIS OWNER’S MANUAL
Operate and maintain this gas heater according to
instructions in this manual. Read this manual in
its entirety.

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SAFETY INFORMATION
Your Tucson Vent-Free is very attractive and extremely
efficient, utilizing today’s best technologies. By
following a few simple safety precautions and by
performing minimal maintenance, the unit will remain
appealing while providing years of quality performance.
WARNING
Installation and repair should be done by a qualified
service person. The appliance should be inspected
before use and at least annually by a qualified
service person. It is imperative that control
compartments, burners, and circulating air passages
of the appliance are kept clean and free of
obstructions.
IMPORTANT
Please read and understand all warnings before
installing or operating this heater. Failure to follow
these instructions or improper use of this heater will
void the warranty and can cause serious injury or
death from burns, fire, explosion and carbon
monoxide poisoning. Do not attempt to alter or
modify the construction of this heater or its
components. Any alteration or modification of
constructionvoidsthewarrantyand the certification
of this heater. Save this manual for future reference.
DANGER: CARBON MONOXIDE
POISONING MAY LEAD TO DEATH!
Carbon Monoxide Poisoning: Early signs of carbon
monoxide poisoning resemble the flu with headaches,
dizziness, and/or nausea. If you have these signs, get
fresh air immediately! Have the heater serviced, as it
may not be operating properly. As a safety precaution,
a CO monitor may be installed in or near the room
where the unit will be operating.
The installation must conform with local codes or, in
the absences of local codes, the current National Fuel
Gas Code, ANSI Z223.1 (NFPA 54).
DO NOT INSTALL THIS HEATER IN A
BEDROOM OR BATHROOM.
Do not use this heater if any part has been under water.
Immediately call a qualified service technician to
inspect the heater and to replace any part of the control
system and gas control which has been under water.
This heater has a standing pilot which incorporates an
Oxygen Depletion System (ODS). The ODS shuts off
the flow of gas to the pilot and the burner in the event
that sufficient fresh air becomes unavailable for
continued safe operation of the heater. If this heater
shuts off during operation, sufficient fresh air may not
be available. Refer to the Troubleshooting or Fresh Air
Requirements sections of this manual, or call a qualified
service technician.
Avoid any drafts that alter the burner flame patterns.
Do not allow fans to blow directly into the heater.
Ceiling fans may create drafts that alter burner flame
patterns. Sooting and improper burning may occur.
This unvented gas heater is intended to be smokeless.
During the first few hours of operation the appliance
may produce a slight smoke and/or odor. This is
normal during the first burn. During the initial burn,
open a window(s) to assist in the removal of the
smoke/odor. If the logs appear to smoke, turn the
heater off and call a qualified service technician.
During any pressure testing of supply piping system in
excess of ½ psi (14" w.c.), the heater and its control
valve must be disconnected from the gas supply system.
If equal to or less than ½ psig, it must be isolated from
the gas supply piping system by closing its individual
manual shutoff valve.

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SAFETY INFORMATION cont.
HOT SURFACES
Certain exposed surfaces of the Tucson will reach high
temperatures during normal operation. Clearances to
combustibles must be maintained, as specified in the
Clearances To Combustibles section of this manual. The
Tucson should be located out of traffic and away from
furniture, draperies, clothing and flammable materials.
Do not place objects that may obstruct air circulation on,
under, or near the heater. Do not place objects on the top
grill of the stove. Doing so will obstruct the air flow of
the stove, preventing it from operating properly. Clean
the area around, under, and behind the unit on a regular
basis to prevent the accumulation of dust and lint.
Children and adults who are unfamiliar with heaters of
this type should be alerted to the hazards of high surface
temperatures and warned that they should stay away to
avoid burns to skin and clothing. Children should be
carefully supervised when in the same area as the Tucson
heater. Do not leave children unattended in the vicinity
of this unit.
NEVER BURN PAPER, WOOD, OR OTHER
MATERIALS
This gas heater is designed to burn either natural
gas(NG) or liquid propane(LP). Never burn any fuel
which was not intended for use.
DO NOT LIGHT PILOT OR MAIN BURNERS
BY HAND
The standing pilot light equipped with this gas heater is
lit by using a piezoelectric spark generator, as described
in the How To Turn the Unit On & Off section of this
manual. Never attempt to light the pilot or main burners
by hand (with a match or lighter). After repeated
attempts, if the pilot light fails to light, discontinue
operation, turn off the gas at the gas control valve, and
immediately contact qualified service personnel for
assistance.
FIRE HAZARD
Do not store or use gasoline or other flammable
vapors and liquids in the vicinity of this appliance.
The Tucson should be located out of traffic and
away from furniture, draperies, clothing, and
flammable material.
CERAMIC FIBER LOG SAFETY
INFORMATION
If the decorative ceramic logs and ember strip
material supplied with the Tucson are damaged or
missing, they must be replaced with the same,
approved replacement parts supplied by the
manufacturer. These components affect the
combustion quality and safety of the heater. Do not
replace fiber ceramic logs or ember strip with
unapproved ceramic logs or any other material.
Always wear gloves and safety goggles while
handling the log set and ember strip.
SERVICE CAUTION
If you believe your Tucson is not, in any way,
performing properly, immediately discontinue
operation until the unit has been inspected and
approved by qualified service personnel. Prior to
servicing the unit, turn the valve control knob
clockwise to “OFF”. The unit should be cool prior
to servicing and cleaning. Any component
removed during servicing should be replaced prior
to operation. Use of any components not supplied
by HearthStone on the stove voids all warranties.
Do not substitute components.

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CLEARANCES TO COMBUSTIBLES
Due to high surface temperatures, the Tucson should
be located out of traffic and away from furniture and
draperies. Clothing and other flammable material
should not be placed on or near the Tucson heater.
Always maintain adequate clearances around the air
openings into the combustion chamber and allow for
adequate ventilation. Minimum clearances to
combustibles must be maintained as shown to the
right, in Figure 1.
Figure 1Clearance to combustibles (Minimum alcove height 22” above stove top)
HEARTH REQUIREMENTS/FLOOR PROTECTION
The Tucson can be installed on wood flooring or
a non-combustible surface. For installation of the
Tucson on carpeting, vinyl tile, or other
combustible materials other than wood flooring,
the unit shall be installed on a metal or other
non-combustible hearth.
NOTE: Some wood floor varnishes, stains, or
polyurethane may be affected by heat.
CODES
Adhere to all local codes or, in their absence, the latest edition of THE NATIONAL FUEL GAS CODE
ANSI Z223.1 (NFPA54), which can be obtained from:
AMERICAN NATIONAL STANDARDS INSTITUTE, INC.
1430 BROADWAY
NEW YORK, NY 10018
OR
NATIONAL FIRE PROTECTION ASSOCIATION, INC.
BATTERY MARCH PARK
QUINCY, MA 02269

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FRESH AIR REQUIREMENTS
Your Tucson stove requires an adequate supply of
fresh air to function properly and safely. The fresh
air supply must be met within the space in which the
heater is to be installed. To ensure an adequate
supply of fresh air is available for proper and safe
operation of your Tucson stove, the following
information must be considered when installing the
appliance in a mobile home, modular home, or an on-
site house, Refer to Figure 2.
The space in which the heater should be installed will
fall into one of the following categories:
1. Unusually tight construction
2. Unconfined space
3. Confined space
WARNING: If the area in which the heater
may be operated is smaller than that defined as an
unconfined space, provide adequate combustion
and ventilation air by one of the methods
described in the National Fuel Gas Code ANSI
Z223.1, Latest Edition, Section 5.3.
DETERMINING SPACE CLASSIFICATION
Unusually tight construction
This is construction where:
a. Walls and ceilings exposed to the outside
atmosphere have a continuous water vapor retarder
with a rating of one perm (6 x 10G¹¹ kg per pa-sec-
m²) or less with openings gasketed or sealed, and
b. Weather-stripping has been added on openable
windows and doors, and
c. Caulking or sealants are applied to areas such as
joints around window and door frames, between sole
plates and floors, between wall ceiling joints,
between wall panels, at penetrations for plumbing,
electrical, and gas lines, and at other openings.
If the space in which the heater will be installed falls
into this category, supplemental fresh air must be
provided, as outlined in the Meeting Fresh Air
Requirements section of this manual.
Unconfined space
If the space in which the heater is to be installed
meets the following criteria, it is considered to be an
unconfined space.
The room in which the heater is to be installed has an
air volume of at least 50 cubic feet (cubic feet =
length x width x height of the space) for each 1000
BTU/hr (4.8 m³ / K. W.) input rating for all
appliances in the space. This includes adjoining
rooms only if there are door less passageways
between them, or there are vents between the rooms.
If the space in which the unit is being installed is an
unconfined space, additional fresh air is not needed.
Confined space
If the space in which the heater is to be installed
meets the following criteria, it is considered a
confined space.
The room in which the heater is to be installed has an
air volume of less than 50 cubic feet for each 1000
BTU/hr (4.8 m³ / K. W.) input rating for all
appliances in the space. This includes adjoining
rooms only if there are doorless passageways
between them, or there are vents between the
rooms.(See Figure 5).
If the space in which the heater is to be installed is a
confined space, additional fresh air must be provided.
This can be done by one of the ways outlined in the
Meeting Fresh Air Requirements section of this
manual.
Example (refer to Figure 2)
I. Determine the volume of the space where the unit
will be installed. Volume = length x width x height.
Also included in the volume of the space is the
volume of any adjoining rooms, only if there are
doorless passage ways between them, or if there are
vents between the rooms.
II. Multiply the volume by 1000 BTU/hr, then divide
that number by 50 cubic feet, to obtain the total
maximum BTU/hr rating which the room can
support.
III. Add the BTU/hr ratings of all fuel burning
appliances installed within the same space. The BTU
rating for this unit is 20,000 BTU/hr. (Do not include
any direct vent appliances, as these types of
appliances use outside air for combustion and
venting).IV. Compare the maximum BTU/hr rating
that the room can support (from II.) with the

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maximum BTU/hr rating of the combined appliances
(from III.). If the number from III. is smaller than the
number calculated in II., the space should be
considered an unconfined space. If the number from
III. is larger than II., the space should be considered a
confined space, and additional fresh air must be
provided. This can be done by one of several ways.
Figure 2Confined space

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MEETING FRESH AIR REQUIREMENTS
1. Air from inside the building.The confined space
shall be provided with two permanent openings
communicating directly with an additional room(s),
of sufficient volume, so that the combined volume of
all spaces meets the criteria for an unconfined space.
The total input of all gas utilization equipment
installed in the combined space shall be considered in
making this determination. Each opening shall have
a minimum free area of 1 square inch per 1,000
BTU/hr (22 cm² / kW) of the total input rating of all
gas utilization equipment in the confined space, but
not less than 100 square inches (645 cm²). One
opening shall commence within 12 inches (30 cm) of
the top, and one opening shall commence within 12
inches (30 cm) of the bottom, of the enclosure. The
minimum dimension of air openings shall not be less
than 9 square inches (8 cm) (see Figure 3).
2. All air from outdoors. The confined space needs
to have two permanent openings, one commencing
within 12 inches (30 cm) of the top, and one
commencing within 12 inches (30 cm) of the bottom,
of the enclosure. The openings shall communicate
freely with the outdoors, either directly, by ducts, or
by spaces (crawl or attic). The minimum dimension
of air openings shall be not less than 9 square inches
(8 cm). See Figure 3.
A. Where directly communicating with the outdoors,
each opening shall have a minimum free area of 1
square inch per 4,000 BTU/hr (5.5 cm² / kW) of total
input rating of all equipment in the enclosure. See
Figure 3.
B. Where communicating with the outdoors through
vertical ducts, each opening shall have a minimum
free area of 1 square inch per 4,000 BTU/hr (5.5 cm² /
kW) of total input rating of all equipment in the
enclosure (See Figure 3).
C. Where communicating with the outdoors through
horizontal ducts, each opening shall have a minimum
free area of 1 square inch per 2,000 BTU/hr (11 cm² /
kW) of total input rating of all equipment in the
enclosure (See Figure 3).
D. Where ducts are used, they shall be of the same
cross-sectional area as the free area of the openings to
which they connect.
Figure 3

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PACKING LIST & ITEMS REQUIRED FOR INSTALLATION
Packing list
1 -Tucson Vent-Free
Gas-Fired Heater
4 -Decorative Ceramic Fiber Logs
1-Ember Screen
1-Bag of Embers
1 -Thermostat with 40' wire
1 -Owners Manual
1 -Warranty Validation Form
1-Stone Set
Items Required For Installation
Ensure that the following items are available before
proceeding with installation:
5/32 Allen wrench
An external regulator (for propane/ L. P. gas only)
Gas piping, which complies with local codes
Pipe sealants approved for use with propane/L. P. Gas
(resistant to sulfur compounds)
A manual shutoff valve for the gas supply
A sediment trap
Pipe wrenches
Phillips head screwdriver
Other parts required by local code
Safety glasses
Gloves
UNPACK & INSPECT FOR DAMAGE
Unpack
The Tucson is packaged by the manufacturer to
withstand shipment without damage under most
circumstances. However, damage can occur
during transit and handling. Care should be taken
when unpacking, inspecting for damage, and
installing the unit. If any damaged or missing
parts are detected, immediately contact your
dealer.
After removing the shipping carton, carefully
remove the top three stones and grill. Use the
protective wrapping material to temporarily
protect the stones from chipping or damage while
the unit is inspected and installed.
With the top stones and grill removed and set
aside, undo the lag bolts that fasten the unit to the
pallet. Take care not to mar or chip the legs if
enameled. Lift the stove off the pallet and set it
in place, (with regards to the Clearances To
Combustibles section of this manual.)
Inspect for damage
Inspect the Tucson for visible and/or concealed
damage. The unit should appear to be square and
true. The stones should be whole and without
cracks, chips, or breakage. The sheet metal parts
should be smooth and free of bends and/or dents.
If the heater is enameled, the enameled cast iron
should be free of chips and/or cracks. If visible or
concealed damage is found or suspected, contact
your local dealer for instructions.
The Owner’s Manual, thermostat (with wire),
removable ash lip, and the decorative ceramic fiber
logs, supplied with the Tucson, are contained within
the firebox. It is important to wear the safety
goggles and gloves when handling the log set.
Open the firebox door using a 5/32 allen wrench
and inspect the logs for damage. If a damaged log
is encountered, contact your local dealer for
replacement logs. Put the logset, thermostat, and
the ash lip aside. They will be installed later.

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ELECTRICAL CONNECTIONS
NOTE: OPEN VALVE DOOR UNDER ASH LIP
FOR ELECTRICAL AND GAS CONNECTIONS
Thermostat
The Tucson may use the wall mounted thermostat for
operation, or the on/off/tstat switch. The thermostat
controls the unit by “calling for heat.” The
thermostat turns the unit on when the room is cold,
and turns the unit off once the room is warmed
sufficiently. The thermostat is controlled by a 750
millivolt DC two-wire circuit. Both the thermostat
and 40' of thermostat wire are included as standard
equipment.
Thermostat Placement
The thermostat should be placed in the same room or
living space as the unit. Typically 5' off the floor
and away from any influences that may cause the
temperature in the vicinity of the thermostat to be
unrepresentative of the room temperature in general.
Such influences might include strong lighting, a
heater vent from the central heating system, or a
nearby drafty window.
Placement of the thermostat on an inside wall rather
than an outside wall is preferable. Do not place the
thermostat directly behind or too close to the unit,
otherwise heat from the unit will immediately satisfy
the thermostat and turn the unit off.
Violet
Black
Yellow
On/Off/T-stat
Figure 4Wiring diagram
Thermostat Wiring
The thermostat wire from the unit to the thermostat
can be surface mounted, routed under the floor, or
through walls, etc. The thermostat should be
connected to the unit using the 40' , or as much as
needed, of insulated thermostat wire provided. Be
sure to leave a small coil of wire behind the unit so
that it can be moved out of position for servicing and
cleaning.
The proper location of wire connections is shown
below and in Figure 10. When making these
connections, position the thermostat wire so it
extends towards the wall behind the unit, then
towards the thermostat. (At the thermostat, the wires
should be connected to the two connection screws on
the back of the thermostat per the instructions
received with the thermostat). Take care not to over-
tighten the connection screws and not to damage the
internal parts of the thermostat. Now attach the wires
in their proper location, shown in Figure 10.
Location of Wire Connections:
WIRE LOCATION LABEL
Thermostat(2 wires) 1-Top Post on Valve TH
1-On/Off/T-stat switch Yellow wire
Thermopile(2 wires) 1-Bottom Post TP/TH
1-Middle Post TP

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GAS SUPPLY & CONNECTIONS
Gas Supply
NOTICE: A qualified technician must connect the
heater to the gas supply and leak test the unit
before it is approved for use. Consult all local
codes.
WARNING: The unit must be installed and
connected in accordance with local codes, or in the
absence of local codes, with the most current edition
of the National Fuel Gas Code ANSI Z223.1/NFPA
54.
We recommend using new black iron or steel pipe
only. Internally tinned copper tubing can be used in
some areas when permitted by local codes. Only use
pipe of ½" or greater diameter to allow full gas
volume to heater. Excessive pressure loss will occur
if the pipe is too small.
The supply line must include a manual shut-off valve
and union so that the unit can be disconnected for
servicing Also a sediment trap must be installed
upstream of the heater. The sediment trap is installed
to prevent moisture and contaminants from passing
through the pipe to the heater controls and burners.
Failure to install a sediment trap could prevent the
heater from operating reliably.
The gas supply line connection is made to the
Tucson’s gas control valve just inside the left front
leg of the unit using a d" male NPT fitting. The
supply line should be ½" diameter or appropriately
sized to provide a sufficient gas supply to meet the
maximum demand of
the unit without undue loss of pressure. We
recommend a flexible line to avoid undue mechanical
load on the valve and to ease thread alignment, but
also refer to local code.
CAUTION: Check Gas Type! The gas supply must
be the same as stated on the heater’s rating
plate(located on the back of the unit). If the gas
supply is different, DO NOT INSTALL the heater.
Contact your dealer for the correct model.
Gas Pressure Adjustment
The supply line pressure is tested, to ensure it meets
the minimum pressure, as listed in the Specifications
sections of this manual, for the type of fuel in use
(NG or LP). The Tucson must be isolated from the
gas supply piping system by closing its individual
manual shutoff valve during any pressure testing of
the gas supply piping system at test pressures equal to
or less than ½" psig. During tests in excess of ½"
psig. (14" w.c.), the heater must be disconnected from
the gas supply system. Test by connecting a
manometer to the supply line. Adjust the incoming
pressure, if necessary, to meet the required supply
line pressure. Once connected to the gas supply, the
gas inlet pressure and manifold gas pressure must be
tested. The gas inlet tap (6) and manifold pressure tap
(7) is located on the control valve (see Figure 5).
Connect a manometer to the test points on the gas
control valve, refer to #’s 6 & 7of Figure 5for
locations.
Figure 5

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LOG SET INFORMATION
CAUTION: Fragile! Handle log set and ember strip with
care. Always wear gloves and safety goggles while
handling the log set and the ember strip.
Log Placement Within The Unit
Only the decorative ceramic fiber log set supplied with the
unit should be placed in the firebox. Do not place other
ceramic logs, real wood logs or other material in the firebox.
If the log set is damaged or broken contact your dealer for
replacement.
If the log set does not set into the firebox exactly as outlined
below, contact your dealer for assistance. Exact positioning
of the log set is required in order to obtain a pleasing flame
pattern and efficient combustion. Incorrect log placement
may cause carbon build-up, excess thermal stress on the log
set and stove parts, reduced efficiency, and high levels of
carbon monoxide.
The decorative ceramic fiber log set will give long service
when in use; however, they will break if subjected to rough
or improper handling. Broken or cracked logs should be
replaced. When removing and replacing the log set from the
unit during routine cleaning or service of the unit, take care
not to damage the logs and to position the log set per
instructions above. Also, take care not to chip the enamel on
the door and door frame when removing and replacing the
log set.
Installation of Log Set
Refer to figures 6 & 7 for log set assembly
1) Open the front door using a 1/8" allen wrench.
Loosen the bolt that fastens the door frame to the
firebox by turning it counterclockwise. Be careful not
to chip enamel when loosening the bolt Pull the door
open by grabbing the top edge of the door frame.
2) Remove the packaging material around the log set
assembly. Be careful not to. damage the log set when
unpacking.
3) Gently place the Rear Log (1) in the firebox
against the center of the back wall.
4) Gently place the Middle Log (2) in the fire box
against the front of the Rear Log. There are slots on
the underside that fit in between the burner tube and
into the burner tube holder. The middle log has two
Figure 6
Figure 7

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holes that will slide over the two posts in the bottom
of the firebox The rear tabs on the Middle Log
should touch the front of the Rear Log, and the log
should be centered as best as possible.
5) Place the Ember Screen (3) on the front burner
tube with the long side of the Screen to the front, and
the tabs should be facing down.
6) Gently place the Front Log (4) in the firebox
against the front of the burner tube. Center as best as
possible.
7) Spread evenly across the Ember Screen, the 2
ounces of Charcoal Embers (5).
8) Gently place the Top Log (6) in the firebox on top
of the Middle Log. The Middle log has 2 posts which
slide into the 2 holes on the underside of the Top Log.
The “leg” on the Top Log points towards the front.
9) With the 1/8" allen wrench fasten the door to the
firebox. Make sure the door is properly secured to the
firebox before turning the unit on. Be careful not to
chip the enamel when fastening the door.
Removal of Log Set
CAUTION: Log set and charcoal embers retain heat
and can be very hot! Allow 2 to 3 hours after pilot
light is turned off before handling.
CAUTION: Fragile! Handle log set and charcoal
embers with care.
Open door using the 5/32 allen wrench. Loosen the
screw that secures the door to the firebox by turning
it counterclockwise. Pull the door open by grabbing
the top edge of door frame. Take care not to chip the
enamel or to damage the log set when removing the
log set from the firebox. The log set assembly will
be in four pieces along with the charcoal embers as
shown in Figure 6. First, remove the Top Log(6) by
pulling it up off the Middle Log(2) and out of the
firebox. Next remove the charcoal embers. Then lift
upwards and pull the Front Log(4) out of the
firebox. Next remove the ember screen(3) from the
burner tube. Grip the Middle Log(2) and lift upward,
off the burner tube holder, and out of the firebox.
The Rear Log(1) can then be removed from the
firebox. Place the logs and charcoal embers in a
safe area where they will not be damaged.
BEFORE THE STOVE IS LIT
CAUTION: Lighting the Tucson for the first
time and adjustments to the unit should be
performed by qualified service personnel.
WARNING: If you do not follow these instructions
exactly, a fire or explosion may result causing
property damage, personal injury or loss of life.
Initial Adjustments
Once the Tucson has been set in place and
connected as described in the Gas Supply &
Connections and Electrical Connections sections of
this manual, the unit is ready to be lit for the first
time. The manufacturer tests each unit prior to
shipment, so ignition should take place without
failure. However, a number of small adjustments
may be necessary to compensate for variations in
gas pressure, altitude, and other factors particular to
each installation.
Smoke and Fumes Warning
When lit for the first time, the unit will emit some
smoke and fumes. This is normal “off-gassing” of
the paints and oils used in the manufacturing and
assembly of the unit. Open windows to vent the
room if necessary. The off-gassing and fumes will
subside after the first 10 to 20 minutes of operation.

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Odors and Impurities
A Vent-Free combustion system is such that odors
may be produced during heater operation due to
impurities that may exist in the immediate area.
Sources of impurities can be cleaning solvents,
paint solvents, cigarettes, smoke, pet hair, dust,
adhesives, new carpet, and/or textiles. If any fumes
of this sort mix with the combustion fumes, an odor
may develop. Such odors will dissipate. However,
the condition can be alleviated by opening a
window or otherwise providing additional
ventilation to the area. If any odor persists, contact
your dealer or an authorized service technician.
WARNING: THE CONTROL HAS AN
INTERLOCK DEVICE. AFTER SHUTTING OFF
ALL GAS FLOW, THE PILOT BURNER
CANNOT BE RELIT UNTIL THE
THERMOCOUPLE HAS COOLED, ALLOWING
THE ELECTROMAGNET TO BE RELEASED
(APPROX. 60 SEC). THE GAS CONTROL
KNOB IS DESIGNED TO BE OPERATED BY
HAND. NEVER USE ANY TOOLS DURING
THIS OPERATION. IF THE KNOB WILL NOT
PUSH IN OR TURN BY HAND, DON’T TRY TO
REPAIR IT, CALL A QUALIFIED SERVICE
TECHNICIAN. DAMAGED KNOBS MAY
RESULT IN FIRE, EXPLOSION, OR SERIOUS
INJURY.
Pilot Light Warning
The Tucson has a piezoelectric spark ignitor (the
red push button located next to the gas control valve
behind the valve access door) which ignites the
pilot light by means of a spark at the pilot light
assembly. Do not attempt to light the unit with a
match or by any means other than the piezoelectric
spark ignitor.
Prepare for Lighting
Prepare for the lighting procedure by adjusting the
thermostat to its lowest setting or OFF position. If
the gas control knob is not in the OFF position, turn
the knob fully clockwise to OFF. Locate the
variable output and turn it fully clockwise to the
highest setting.
Prior to lighting the unit for the first time, wait 5
minutes to allow any residual gas within the unit to
dissipate. Smell all around the appliance area for
gas. Be sure to smell next to the floor because
some gases are heavier than air and will settle on
the floor. If you do not smell gas after this five
minute period, proceed with the lighting procedure.
If you do smell gas, do not proceed with the
lighting procedure. Instead, immediately refer to
the What To Do If You Smell Gas Warning, on the
cover of this manual.
HOW TO TURN THE UNIT ON & OFF
Lighting the Unit
1. STOP! Read the What To Do If You Smell
Gas! warning.
2. Set the on/off/T-stat switch or thermostat to
the off position.
3. Push in and turn the gas control knob
clockwise to “OFF”.
4. Wait (5) five minutes to clear out any gas.
If you then smell gas, STOP!, immediately
follow the What To Do If You Smell Gas!
warning (on the cover of this manual). Smell
all around the appliance area for gas. Be sure to
smell next to the floor because some gases are
heavier than air and will settle on the floor. If
you do not smell gas, proceed to the next step.
5. Turn the gas control knob counterclockwise
to “PILOT”.
6. Push in the control knob all the way and hold it
in. Immediately light the pilot with the gas
lighter (push in and “click” the red piezoelectric
spark ignitor button several times until lit).
Continue to hold the control knob in for about
20 seconds after the pilot is lit. Release the knob
and it will pop back out. The pilot should
remain lit. If the pilot goes out, repeat the
operation.

OWNER’S MANUAL MODEL: 8745 TUCSON Vent-Free HEATER
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* If the knob does not pop out when released,
stop and immediately call a qualified service
technician or gas supplier.
* If the pilot will not stay lit after several tries,
turn the gas control knob clockwise to
“OFF” and call a qualified service
technician or gas supplier.
7. After the pilot lights, turn the gas control
knob counterclockwise to “ON”.
8. Select the “ON” or “T-STAT” position of
the On/Off/T-stat switch. Shut the gas
control valve access door.
9. If the “T-STAT” position was selected,
set thermostat to “ON” and set the desired
temperature setting.
NOTE: When pressing/clicking the red
piezoelectric spark ignition button to light the
pilot, watch through the glass (front door) of the
unit. Click the red ignitor button until a flame is
visible at the pilot. Once the pilot is lit, continue
to press on the gas control knob for another 20
seconds, then release. Ascertain that the pilot is
still lit by looking through the front door. If lit,
then turn the gas control knob fully
counterclockwise to the “ON” position. If the
pilot fails to light or if it went out due to a
premature release of the gas
control knob while pressed in the “PILOT”
position, wait 60 seconds for the Interlock to
release. Then repeat the lighting process as
described in the Lighting the Unit portion of this
section of the manual.
Once the pilot has been lit, and the gas control
knob has been turned to the “ON” position, the
main burners are lit by selecting “ON” of the
On/Off/T-stat switch, or if “T-STAT” was
selected, by moving the thermostat to a high
setting so that it “calls” for heat (i.e. turns the
unit on). The main burners should light
immediately. Note that the on/off cycling of the
main burners is controlled by the thermostat, but
the pilot remains lit regardless of the thermostat
setting. To turn the pilot off, turn the gas control
valve fully clockwise to the “Off” position.
Turning Off the Unit
1. Set thermostat to the “Off” position.
2. If shutting the unit off for the non-heating
season, turn the gas control knob fully clockwise
to the “Off” position. Do not force the knob to
turn.
BURNER FLAME APPEARANCE
Burner Flame Appearance
Once the unit is lit, observe the flame pattern and
adjust as necessary. Also a periodic visual check of
the burner flame should be performed. To
determine if the burner flame needs adjustment, it is
necessary to view the flame pattern with the
variable output control knob at its highest
setting(turned fully clockwise). Allow the unit to
operate for 10 minutes enabling the entire unit to
reach temperature and for the flame pattern to
stabilize. The flame pattern should be similar to the
one shown in Figure 8. There are several guidelines
to aid in determining if the flame pattern is correct:
11) the flame should not be dirty or lick the top of
the stove
2) the flame should not raise off of the burner tube,
called “lifting”
3) flames should not impinge heavily on log set,
they should “fit” through the pre-formed spaces
designed in the log set
Figure 8Flame pattern

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INITIAL ADJUSTMENTS
Variable Output Control
The gas control valve is equipped with a variable
output control. This control varies the rate of heat
produced by the unit by varying the gas pressure to
the main burner tube. The length of the burn cycle
is affected by a combination of heat output and the
thermostat setting. If your stove cycles on and off
often, try, first, reducing the burn cycle by turning
the HI/LOW knob, on the control valve to a lower
setting.
Using the variable output control, the heat output of
the unit can be reduced for mild fall and spring
months, or maximized for the colder winter months.
This adjustment can be made by the homeowner as
necessary by turning the variable output control
knob to “HI”, “LO”, or any setting in between.
Air Shutter
The air shutter is preset by the manufacturer for
optimum operation and should not be adjusted by
the owner. The air shutter is used to regulate the
air-to-gas combustion mixture which in turn
influences the size and color of the flames.
Pilot Adjustment
The pilot light is preset by the manufacturer and
should not need adjustment. The pilot light flame
should be large enough to engulf the thermopile
and, on a NG assembly, the thermocouple as well
(located next to the pilot), but not so large as to
create excessive noise or consume excessive gas.
However, it can be adjusted by means of the pilot
light adjustment screw located on the gas control
valve. Open valve door to access the pilot
adjustment screw. Refer to # 3 of Figure 5 to
determine the location of the pilot adjustment
screw.
Note that the pilot flame must engulf the thermopile
so that the thermopile can generate sufficient milli-
voltage (325 to 750mv) to power the millivolt gas
control valve. The flame on the pilot should look
like Figure 9. Controlling the Tucson by the wall
mounted thermostat may become erratic,
nonexistent, or the unit may go out, if the pilot light
flame is too small or misdirected away from the
thermopile.
Figure 9
DAILY OPERATION
Daily Operation
The Tucson gas-fired heater is easily operated by
the homeowner once installed and adjusted by
qualified service personnel. The unit is controlled
via the wall-mounted thermostat during the heating
season. Set the thermostat to the desired room
temperature and the unit will cycle on and off as
required. By adjusting the variable output control,
located on the gas control valve, the rate of heat
output can be varied to meet the heating
requirements of the season. Choosing a low flame
setting will result in longer burn cycles at a reduced
output, while choosing a high flame setting will
result in a shorter, hotter burn cycle.

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DAILY OPERATION cont.
Through trial and error the homeowner can
select the optimum flame size for their setting
and application.
During the summer, non-heating season, switch
the wall thermostat to “OFF”, and turn off the
pilot. This will improve the overall efficiency of
the unit as the heat from the pilot is not wanted
in the summer. When putting the unit back into
service follow the Lighting
the Unit portion in the How To Turn the Unit On &
Off section of this manual.
When the unit is first lit, especially when cool, it is
normal to experience some condensation on the inside
of the glass window. This condensation will burn off
within the first few minutes of operation. If
continuous condensation or water drips are noted from
any part of the unit, immediately discontinue operation
of the unit and contact qualified service personnel.
ROUTINE MAINTENANCE AND CARE
Routine Maintenance and Care
The Tucson requires minimal routine maintenance
and care. The unit should always be cool and off
when being cleaned.
WARNING: Do not substitute Materials.
For replacement parts, or for information about
parts or service, contact your local HearthStone
dealer.
Cleaning
The unit should receive regular cleaning on, under,
and around the stove to prevent the buildup of dust
and lint. The exterior surfaces of the unit can be
cleaned using soap, water, and a soft cloth. Do not
use abrasive or chemical cleaners and take care not
to scratch the stones, or enamel finish (if so
equipped) when cleaning the unit. The use of
chemical or wax based cleaners or polishes is not
recommended due to the potential for discoloration
of the stones when the residue of the cleaners or
polishes is exposed to heat.
Firebox
The firebox should receive periodic cleaning to
prevent the accumulation of dust, lint, and other
debris. To clean the firebox, set the thermostat to
the “OFF” position, and turn off the gas at the gas
control valve. When the unit is cool, unfasten the
front door and carefully remove the decorative
ceramic fiber log set (after they have cooled),
taking care not to damage the logs or chip the
enamel cast iron. Clean the firebox, burner tube,
pilot assembly, and carefully vacuum the entire
surface of the log set. Take care to thoroughly
vacuum the ports (holes) along the top of the burner
tubes and the pilot assembly.
Pilot & Burner Flames
With the decorative ceramic fiber logs out of the
firebox, fasten the door shut and momentarily light
the unit according to lighting instructions described
in the How To Turn the Unit On & Off section of
this manual. Check to ensure a flame is burning
from each burner port. The pilot flame should be
large enough to engulf the thermocouple as shown
in Figure 9. NOTE: Do not operate the unit for
more than 1-2 minutes without the log set in place.
Turn the unit off by setting the thermostat to “Off”,
and turning off the gas control valve. Allow the
unit to cool.
Check and clean any burner ports which were not
burning properly or at all. Clean burner ports using
a soft brush or vacuum cleaner. If the pilot flame
height needs adjustment it should be adjusted by
qualified service personnel as described in the
Initial Adjustments section of this manual.
Complete the cleaning procedure by carefully
placing the log set within the firebox as described in
the Log Set Information section of this manual.
Close and fasten the front door. Turn on the gas,
light the unit and check for proper operation. Flame
patterns should look like Figure 8. Regularly check
to insure the area around the Tucson is kept free and
clear from combustible materials, gasoline, and
other flammable vapors and liquids. Check that the
flow of combustion and ventilation air is not
obstructed. Once a year the unit should be
inspected by qualified service personnel to

OWNER’S MANUAL MODEL: 8745 TUCSON Vent-Free HEATER
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ensure that it is clean, free of obstruction, safe,
and in good working order. If service or
maintenance is required, it should be performed
by qualified service personnel.
WARNING: Do not substitute Materials.
For replacement parts, or for information about
parts or service, contact your local HearthStone
dealer. For the name of the dealer nearest to you,
phone or write:
HearthStone
317 Stafford Avenue
Morrisville, Vermont 05661
E-Mail:[email protected]
PARTS LIST
Part # Description
2710-115 bottom
2710-220 ash lip
2710-321 right side
2710-326 left side
2710-420 exhaust baffle
2710-511 front door
5710-170 door hinge with bracket
5710-180 door latch bracket
2710-560 glass ret frame
2710-581 front grill
2710-810 top grill
2710-818 top
2710-655 handle, door
1741-350 top side stones 35 /16" x10 5 /16"
1741-351 side stones 7½" x 6½"
1741-352 top center stone 8e" x 3e"
7211-554 rear log
7211-559 middle log
7211-556 front log
7211-557 top log
7211-558 charcoal ember (2 oz.)
5320-070 ember screen
5710-119 light shield
5710-120 back light shield
7000-015 thermostat wire
7200-506 thermostat
7000-200 3-way on/off switch
Part # Description
5710-121 valve bracket support
5710-128 valve door
5710-131 ODS pilot bracket
5710-152 burner tube holder
5710-160 log set holder
5710-470 stone clips
5710-511 firebox
5745-030 firebox top plate cover
5710-515 exhaust baffle holder
5710-530 cat. heat shield
5710-597 back shroud
7200-120 burner orifice #55
7200-144 burner orifice #44
7211-005 ¾" Dia. gas line
7211-227 burner tube
7211-301 gas valve sit (NG)
7211-305 gas valve sit (LP)
7211-324 ODS pilot (NG)
7211-327 ODS pilot (LP)
7210-103 piezo igniter
5745-020 door screen
3110-057 d" low density door rope
SPECIFICATIONS
Listed:
Vent-Free Gas-Fired Room Heater
Model:
Tucson Vent-Free Room Heater
Tested to:
ANSI Z21.11.2a-2001,
Testing Agency:
Intertek Testing Services NA Inc. (ITS)
Conditionally approved for purchased mobile home installation.

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Natural Gas LP
Input rating (Btu/hr) 20,000 20,000
Minimum input rating (Btu/hr) 13,500 16,000
Orifice size DMS 44 55
Man. pressure-HI setting (in. w.c./kPa) 3.5 10.0
Man. Pressure-Lo setting (in.w.c./kPa) 1.6 6.4
Inlet pressure-LO (in. W.c./kPa) 5.0 11.0