HearthStone TUCSON User manual

OWNER’S MANUAL
TUCSON Gas-Fired Catalytic Vent-Free Room Heater (8740)
Manufacturedby:
HearthStoneQuality Home Heating Products, Inc.
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 unvented 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
6400-40434 12/01

OWNER’S MANUAL MODEL: 8740 TUCSON Vent-Free ROOM HEATER
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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
WHAT WHEN WHAT WHEN
Firebox Cleaning............. annually Door Gasket.................... replacement as needed
Catalytic combustor......... visual check annually Glass Cleaning................ as needed
Catalytic combustor......... replacement every 5 yrs. or as needed (do not clean the catalytic combustor)

OWNER’S MANUAL MODEL: 8740 TUCSON Vent-Free ROOM HEATER
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INTRODUCTION
Welcome
Congratulations on the purchase of your HearthStone
Tucson Gas-Fired Catalytic 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
Information Sheet...........................................1
Service Record...............................................1
Introduction....................................................2
Safety Information..........................................3
Clearances To Combustibles..........................5
Hearth Requirements/Floor Protection...........5
FreshAirRequirements.....................5
DeterminingSpace Classifications..................6
Meeting FreshAir Requirements....................9
PackingList&Items Required For
Installation......................................................9
Unpack &Inspect For Damage.......................9
Electrical Connections...................................10
Gas Supply &Connections............................11
LogSet Information.......................................12
Before The Stove Is Lit................................13
How To Turn The Unit On & Off................14
Burner Flame Appearance............................15
Initial Adjustments.......................................16
Daily Operation............................................16
Routine Maintenance and Care.....................17
Parts List.........................................19
Specifications...............................................19
Trouble Shooting.........................................20
Warranty......................................................22
READ THIS OWNER’S MANUAL
Operate and maintain this gas heater according to
instructions in this manual. Read this manual in its
entirety.

OWNER’S MANUAL MODEL: 8740 TUCSON Vent-Free ROOM HEATER
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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 construction voids the warranty
and 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.

OWNER’S MANUAL MODEL: 8740 TUCSON Vent-Free ROOM HEATER
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SAFETY INFORMATION cont.
WARNING: DO NOT OPERATE THIS HEATER
WITHOUT THE CATALYTIC COMBUSTOR PROPERLY
INSTALLED. IF THE CATALYST APPEARS ALTERED
OR DAMAGED, DO NOT USE THE APPLIANCE UNTIL
THE CATALYST IS REPLACED.
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.

OWNER’S MANUAL MODEL: 8740 TUCSON Vent-Free ROOM HEATER
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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 Figures 1-4.
HEARTH
REQUIREMENTS/FLOO
R 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, wood, or other non-combustible hearth.
The required size of the hearth is thesame
as the outline of the stove (shown in Figure 19).
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
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 5.
The space in which the heater should be installed will fall

OWNER’S MANUAL MODEL: 8740 TUCSON Vent-Free ROOM HEATER
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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 10
G ¹¹ kg per pa-sec-m²) or less with openings gasketed
or sealed, and
b. Weatherstripping 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 doorless 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 5)
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

OWNER’S MANUAL MODEL: 8740 TUCSON Vent-Free ROOM HEATER
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The following formula can be used to determine the maximum heater rating per the
definition of unconfined space:
(L1 + L2) FT x (W) FT x (H) FT x 1000
BTU/HR =
50
EXAMPLE:
Consider two connecting rooms with an open area between, with the following dimensions:
L1 = 15 1/2 Ft., L2 = 12 Ft., W = 12Ft., H = 8 Ft.
(15 1/2 + 12) x (12) x (8) x 1000
BTU/HR =
50
BTU/HR = 52,800
If there were a door between the two rooms the calculation would be based only on the
room with the heater.
(15 1/2) x (12) x (8) x 1000
BTU/HR =
50
BTU/HR = 29,760
DETERMINING SPACE CLASSIFICATION cont.
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 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.

OWNER’S MANUAL MODEL: 8740 TUCSON Vent-Free ROOM HEATER
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INLET AIR
OPENINGS
VENTILATION LOUVERS
(EACH END OF ATTIC)
VENTILATION LOUVERS FOR
UNHEATED CRAWL SPACE
FIGURE 6
FIGURE 7
FIGURE 8
(EACH END OF ATTIC)
VENTILATION LOUVERS
OUTLET
AIR
INLET AIR DUCT
(ENDS 1 FT ABOVE FLOOR)
FIGURE 9
OUTLET AIR
DUCT
INLET AIR
DUCT
OUTLET
AIR
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 6).
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 Figures 7 thru 9.
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 7.
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 8).
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 9).
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.

OWNER’S MANUAL MODEL: 8740 TUCSON Vent-Free ROOM HEATER
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PACKING LIST & ITEMS REQUIRED FOR INSTALLATION
Packing list
1 - Tucson Vent-Free
Gas-Fired Heater
1 - Decorative Ceramic Fiber Log
1 - Ember Strip
1 - Thermostat with 40' wire
1 - Owners Manual
1 - Warranty Validation Form
Items Required For Installation
Ensure that the following items are available before proceeding with
installation:
1/8 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 1/8
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.