HearthStone Tucson 8720 User manual

Tucson BV Model 8720
Manual: 6400-40433
Revision: 4 - 10/22/2009
Tucson(Model 8720)
Gas-Fired B-Vent Heater
Owner’s Manual
Operation & Installation Guide
Operate and maintain this gas heater
according to this instruction manual.
Read This Manual In Its Entirety.
Save These Instructions!
WARNING: IF THE INFORMATION IN THESE
INSTRUCTIONS 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.
WHAT TO DO IF YOU SMELL GAS:
Do not try to light any appliance.
Do not touch electrical switches; do not use the
phone in your building.
Immediately call your gas supplier from a
neighbor’s phone. Follow your gas supplier’s
instructions.
If you cannot reach your gas supplier, call the fire
department.
A qualified installer, service agency or gas
supplier must perform installation and service.
AVERTISSEMENT: ASSUREZ-VOUS DE BIEN
SUIVRE LES INSTRUCTIONS DONNÉ DANS CETTE
NOTICE POUR RÉDUIRE AU MINIMUM LE RISQUE
D’INCENDIE OU POUR ÉVITER TOUT DOMMAGE
MATÉERIEL, TOUTE BLESSURE OU LA MORT.
Ne pas entresposer ni utiliser d’essence ni
d’autre vaperurs ou liquides inflammables dans
le voisinage de cet apprareil ou de tout autre
appareil.
QUE FAIRE SI VOUS SENTEZ UNE ODEUR DE
GAZ:
Ne pas tenter d’allumer d’appareil.
Ne touchez à aucun interrupteur. Ne pas vous
servir des téléphones se trouvant dans le
batiment où vous vous trouvez.
Appelez immédiatement votre fournisseur de gaz
depuis un voisin. Suivez les instructions du
fournisseur.
Si vous ne pouvez rejoindre le fournisseur de
gaz, appelez le service dos incendies.
L’installation et service doit être exécuté par un
qualifié installer, agence de service ou le
fournisseur de gaz.

Hearthstone Quality Home Heating Products, Inc. Tucson Model 8720
2
Intentionally Blank

Hearthstone Quality Home Heating Products, Inc. Tucson Model 8720
3
Information Sheet
Use this page to record all relevant information concerning the purchase, installation, and maintenance of your
TUCSON Model 8720 Gas-Fired B-Vent 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: Natural Gas Liquid Propane
Sold by: Date of Purchase:
Address:
Phone:
E-mail Website:
Installed by: Date of Installation:
Address:
Phone:
E-mail Website:
Gas Supplier:
Address:
Phone:
E-mail Website:
Read this Owner’s Manual before installing or operating your TUCSON. Retain this manual for future
reference.
SERVICE RECORD
Date Who Performed Work Work Performed Notes:
WHAT WHEN
Firebox Cleaning............. annually
Glass Cleaning................ as needed
Door Gasket.................... Replacement as needed

Hearthstone Quality Home Heating Products, Inc. Tucson Model 8720
4
Table of Contents
INTRODUCTION ..........................................................................................................................5
SAFETY INFORMATION................................................................................................................6
SPECIFICATIONS:.......................................................................................................................9
OWNER’S INFORMATION ...........................................................................................................10
ROUTINE MAINTENANCE AND CARE...........................................................................................10
INSTALLER’S INFORMATION ......................................................................................................12
UNPACK AND INSPECT FOR DAMAGE ................................................................................................................ 12
VENTING .................................................................................................................................14
ELECTRICAL CONNECTIONS......................................................................................................16
GAS SUPPLY &CONNECTIONS .................................................................................................18
LOG PLACEMENT.....................................................................................................................19
LIGHTING THE UNIT FOR THE FIRST TIME ...................................................................................20
INITIAL ADJUSTMENTS..............................................................................................................21
PARTS LISTS...........................................................................................................................24
TROUBLESHOOTING .................................................................................................................25
LIMITED WARRANTIES..............................................................................................................28

Hearthstone Quality Home Heating Products, Inc. Tucson Model 8720
5
INTRODUCTION
Congratulations on your purchase of the Tucson
Model 8720 Gas-Fired B-Vent heater. The Tucson,
by Hearthstone, incorporates the latest in gas
technology, which will provide you with clean,
efficient heat for years to come. The combination of
natural stones and cast iron gives the Tucson a
pleasing look that can be maintained with minimum
care.
The Tucson will provide you with years of practical
and convenient service. However, as with any gas
appliance, the unit must be properly and safely
installed and maintained by qualified service
personnel to ensure safe and trouble-free operation.
Your Tucson is equipped with a standard pilot which:
1. generates a milli-volt signal that powers the
wall-mounted thermostat and;
2. lights the main burner when the thermostat
calls for heat.
This unit is equipped with an On/Off/T’stat switch
and a variable output control. The variable output
control is located on the gas control valve. It allows
you to vary the heat output, along with the flame
height to suit personal taste. Heat output can be
reduced {set to “LOW”} during the Fall and Spring,
when the need for heat is reduced and increased
{set to “HIGH” during Winter months, when the need
for heat is the greatest.
Hearthstone provides a wall-mounted thermostat.
Regardless of how you set the variable output
control, when the optional thermostat is installed and
the On/Off/T’stat switch is set to “T’stat”, the wall-
mounted thermostat will control the unit’s on/off
cycling. At any time, you can override the thermostat
with the On/Off/T’stat switch by setting it to “ON” or
“OFF”.
You can equip the Sterling with an optional blower
fan, which runs independently of the burner flames.
When the switch, which allows you to turn the fan on
or off and control the speed of the fan to suit your
needs, is set to “High” or “Lo”, the fan will
automatically turn on when the stove is hot and
cycle off when the unit is no longer hot.
Also available are two optional remote controls. Both
of the remote controls are capable of turning the unit
on and off. One of the optional remotes also allows
you to control the temperature of the stove from
anywhere in the vicinity of the unit. If “ON” & “OFF”
are the only controls required, use Kit # 90-56912. If
you would like to control the temperature via the
remote control, use Kit # 90-56914.
Read this Owner’s Manual
Operate and maintain this gas heater according to
the instructions in this manual. Read this manual in
its entirety. This manual has two sections, the first
section is for the OPERATOR, and the second section
is for QUALIFIED SERVICE PERSONNEL.
HEATER MUST BE INSTALLED AND MAINTAINED
BY QUALIFIED SERVICE PERSONNEL
Verify the gas connections and venting systems with
requirements of local, regional or national installation
codes. Qualified service personnel must inspect the
gas heater before use and at least annually.

Hearthstone Quality Home Heating Products, Inc. Tucson Model 8720
6
SAFETY INFORMATION
Your Tucson is an attractive and extremely efficient
heater, 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.
The installation must conform to local codes or, in
the absences of local codes, the current National
Fuel Gas Code, ANSI Z223.1 (NFPA 54) or
CAN/CGA B149 Installation Code. (Installer
l’appareil selon les codes ou réglements locaux, ou,
en l’absence de tells réglements, selon les Codes
d’installation CAN/CGA B149.)
During the first few hours of operation the appliance
may produce a slight smoke and/or odor. This is
normal during the first several burns. 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.
The appliance and its individual shutoff valve must be
disconnected from the gas supply piping system
during any pressure testing of that system at test
pressures in excess of ½ psig. (3.5k Pa). The
appliance 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 (3.5k Pa).
FIRE HAZARD
Do not store or use gasoline or other flammable
vapors or liquids in the vicinity of this appliance. The
Tucson should be located out of traffic and away
from furniture, draperies, clothing, and flammable
material.
SHOCK HAZARD
(When equipped with an optional blower)
This appliance is equipped with a three-prong
(grounding) plug for protection against shock hazard
and should be plugged directly into a properly
grounded three-prong receptacle. Do not cut or
remove the grounding prong from the plug.
MUST BE VENTED TO THE OUTSIDE
Never vent the gas heater to other rooms or
buildings. This gas appliance must not be connected
to a chimney flue serving a separate solid-fuel
burning appliance.
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 safety screen, guard, or
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.
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. Due to high temperatures
the appliance should be located out of traffic
and away from furniture, draperies, clothing
and flammable materials. Children and adults
should be alerted to the hazards of high surface
temperatures and should stay away to avoid
burns to skin or clothing ignition. Young
children should be carefully supervised when in
the same room as the appliance. Clothing or
other flammable material should not be placed
on or near the appliance. (Surveille les enfants.
Garder les vêtements, les meubles, l’essence ou
autres liquides à vapeur inflammables lin de
l’appareil.) Clean the area around, under, and
behind the unit on a regular basis to prevent the
accumulation of dust and lint.
NEVER BURN PAPER,WOOD OR
OTHER MATERIALS
This gas heater is designed to burn natural gas or
liquid propane (LP). Never burn any fuel not
intended for use with this unit.
WARNING: THIS GAS APPLIANCE MUST NOT BE
CONNECTED TO A CHIMNEY FLUE SERVING A
SEPARATE SOLID-FUEL BURNING APPLIANCE.
WARNING: DO NOT OPERATE THE APPLIANCE
WITH THE FRONT GLASS REMOVED, CRACKED OR
BROKEN. REPLACEMENT OF GLASS SHOULD BE
DONE BY A LICENSED OR QUALIFIED SERVICE

Hearthstone Quality Home Heating Products, Inc. Tucson Model 8720
7
PERSON. ONLY OPEN FRONT FOR ROUTINE
SERVICE. DO NOT SLAM OR STRIKE GLASS.
CERAMIC FIBER LOG SAFETY
INFORMATION
If the decorative ceramic log material supplied with
the Tucson is damaged or missing, it 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 with
unapproved ceramic logs or any other material.
Always wear gloves and safety goggles while
handling the log set and ember strip.
ELECTRICAL HAZARD
When the optional blower kit is installed, the Tucson
must be electrically grounded in accordance with
local codes, or in the absence of local codes, with
the National Electrical Code, ANSI.NFPA 70 in the
U.S. or CSA C22.1 Canadian Electrical Code in
Canada. The Tucson fan accessory is equipped with
two blower fans. The three-prong grounded plug
must be plugged directly into a properly grounded
three-prong receptacle. Do not cut or remove the
grounding prong from the plug or otherwise attempt
to circumvent the grounding protection provided with
the unit.
DO NOT LIGHT PILOT OR MAIN
BURNERS BY HAND
The standing pilot light equipped on this gas heater
is lit by using a piezoelectric spark generator as
described elsewhere in this manual. Never attempt
to light the pilot or main burners by hand with a
match or lighter. If, after repeated attempts, 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.
MOBILE HOME INSTALLATIONS
This appliance may be installed in an aftermarket,
permanently located, manufactured (mobile) home,
where not prohibited by local codes.
This appliance is only for use with the type(s) of gas
indicated on the rating plate. This appliance is not
convertible for use with other gases, unless a
certified kit is used.
(Cet appareil peut être installé dans un maison
préfabriquée (mobile) déjá installée á demeure si les
réglements locaux le permettent.
Cet appareil doit être atilisé uniquement avec les
types de gas indiqués sur la plaque signalétique. Ne
pas l’utiliser avec d’autres gas sauf si un kited
conversion certifié est installé. )
SERVICE CAUTION
Any shield, door, or safety screen component
removed for servicing will be replaced prior to
operating. If you believe your Tucson is not
performing properly in any way what so ever,
immediately discontinue operation until the unit has
been inspected by qualified service personnel.
Always shut off the gas and electricity to the stove
while servicing. Make sure the unit is not hot when
servicing or cleaning. Use of any components not
supplied by Hearthstone on the stove or vent system
voids all warranties. Do not substitute components.

Hearthstone Quality Home Heating Products, Inc. Tucson Model 8720
8
Warranted by:
Hearthstone Quality Home Heating Products, Inc.
317 Stafford Avenue,
Morrisville, Vermont 05661
E-Mail: [email protected]m
Contact your authorized Hearthstone dealer for
warranty service.
Certified for use by:
Board of State Examiners of Plumbers and Gasfitters
100 Cambridge Street, Room 1511
Boston, Massachusetts
02202

Hearthstone Quality Home Heating Products, Inc. Tucson Model 8720
9
SPECIFICATIONS:
LISTED:B-VENT GAS HEATER
Listed: Gas-Fired B-Vent Fireplace Heater
Model: Tucson B-Vent Gas Fireplace Heater
Testing Agency: Intertek Testing Services NA Inc. (ITS)
Tested to: ANSI Z21.88-2002, CSA 2.33-M02, CAN/CGA2.17-M91
Certified for Canada
Approved for Mobile Home Installation.
Figure 1: Tucson Dimensions
Specification NG LP
Input rating (Btu/hr) 0-1370 m 26,000 26,000
Maximum output (Btu/hr) 0-1370 m 20,000 20,500
Minimum input rating (Btu/hr) 14,700 14,700
Orifice size DMS 0-1370 m 40 53
Man. pressure- HI setting (in.w.c./kPa) 3.5/0.9 10.0/2.5
Man. pressure- LO setting (in.w.c./kPa) 1.2/0.3 3.3/0.8
Inlet pressure-Lo (in.w.c./kPa) 5.0/1.25 11.0/2.75

Hearthstone Quality Home Heating Products, Inc. Tucson Model 8720
10
OWNER’S INFORMATION
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. 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 wasted. When putting the unit
back into service, follow the lighting instructions
described on page 19.
When the unit is first lit, especially when cool, it is
normal to experience some condensation on the
inside of the window glass. This condensation will
burn off within the first few minutes of operation. If
continuous condensation on the window glass or
dripping water from any part of the unit or venting
system (chimney) is noted, immediately discontinue
operation of the unit and contact qualified service
personnel.
ROUTINE MAINTENANCE
AND CARE
The Tucson requires minimal routine maintenance
and care. The unit should always be cool and off
when being cleaned.
CLEANING
WARNING: DO NOT CLEAN THE UNIT WHEN HOT.
The unit must 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 glass or enamel finish (if so equipped)
when cleaning the unit. The use of chemical wax
based cleaners or polishes are not recommended
due to the potential for discoloration or the enamel
when the residue of the cleaners or polishes is
exposed to heat.
FIREBOX,PILOT,&BURNER TUBES
The firebox must also 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, taking care not to damage the
logs or chip the enamel cast iron. Clean the firebox
burner tube and carefully vacuum the entire surface
of the log set. Thoroughly vacuum the ports (holes)
along the top of the burner tubes.
With the decorative ceramic fiber logs out of the
firebox, fasten the door shut and momentarily light
the unit according to the lighting instructions
described on page 19. Check to insure a flame is
burning from each burner port. The pilot flame
should be large enough to engulf the
sensor/thermocouple. 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 that are not burning or not burning
properly. Clean burner ports using soft a soft brush
or vacuum cleaner. If the pilot flame height needs
adjustment, it should be adjusted by qualified
service personnel as described on page 20.
IGNITER
THERMOCOUPLE PILOT
PILOT
FLAME
THERMOPILE
PILOT CLIP
Figure 2: Pilot Assembly
Complete the cleaning procedure by carefully
placing the log set within the firebox as described on
page 17. Close and fasten the front door. Turn on
the gas, light the unit and check for proper
operation. Flame patterns should look like Figure 3.

Hearthstone Quality Home Heating Products, Inc. Tucson Model 8720
11
Regularly check to insure the area around the
Tucson is kept free 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 and venting
system should be inspected by qualified service
personnel to insure that they are clean, free of
obstruction, safe, and in good working order. If
service or maintenance is required, it should be
performed by qualified service personnel.
Figure 3: Burner Flame Pattern
REPLACE THE FRONT DOOR GASKET
AS NEEDED
Your Tucson uses a 3/8” rope-type fiberglass gasket
to make a tight seal between the door frame and the
firebox. In time, the gasket can become brittle and
compressed and should be replaced. New gasket
material is available from your Authorized
Hearthstone Dealer.
1. Allow the Tucson to cool completely. Remove
the existing gasket by grasping one end and
pulling firmly.
2. Use a wire brush or the tip of a screwdriver to
clean the channel of remaining gasket.
3. Determine the correct length of the appropriate-
sized gasket by laying it out in the channel.
Allow an extra 1 to 2” (25-50mm), and mark the
spot to be cut.
4. Cut the gasket at the marked spot with a utility
knife. Twist the ends slightly to prevent the
gasket from unraveling.
5. Apply water glass adhesive to the gasket
channel.
6. Starting at one end, press the gasket into the
channel. Insure a good joint where the gasket
ends meet before trimming any excess. Do not
overlap the gasket ends or leave ends with
ragged edges.
7. Firmly and evenly press the gasket to seat it in
its channel.
CLASS CLEANING
If operating with propane, it is necessary to clean the
inside of the glass occasionally due to impurities in
the gas. Do not use abrasive cleaners. Do not clean
the glass when hot. Allow glass to cool and apply a
window cleaning fluid.
WARNING: DO NOT OPERATE THIS
APPLIANCE WITH THE GLASS PANEL
REMOVED, CRACKED, OR BROKEN. DO
NOT SUBJECT THE DOOR TO ABUSE, SUCH
AS STRIKING OR SLAMMING SHUT.
REPLACEMENT OF THE GLASS PANEL
SHOULD BE DONE BY A LICENSED OR
QUALIFIED SERVICE PERSON.

Hearthstone Quality Home Heating Products, Inc. Tucson Model 8720
12
INSTALLER’S INFORMATION
CODES
Adhere to all local codes or, in their absence, the
latest edition of THE NATIONAL FUEL GAS CODE
ANSI Z223.1 (NFPA 54) or CAN/CGA B149
Installation Code that 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
The appliance when installed must be electrically
connected and grounded in accordance with local
codes or, in the absence of local codes, with the
current NFPA 70-National Electrical Code or CSA
C22.1-Canadian Electric Code.
A manufactured home (or mobile) OEM installation
must conform with the Manufactured Home
Construction and Safety Standard, Title 24 CFR,
Part 3280 (U.S.) or Standard for Manufactured
Home Installation, ANSI/NCBCS A225.1 or Standard
for Gas Equipped Recreational Vehicles and mobile
Housing, CSA Z240.4.CAN/SCA Z240 MH
(Canada). (Installer l’appareil selon les codes ou
règlements locaux, ou, en l’absence de tels
règlements, selon les Codes d’installation
CAN/CGA-B149.)
ITEMS REQUIRED FOR INSTALLATION
* External regulator (for propane/L.P.G. only)
* Piping which complies with local codes
* Pipe sealant approved for use with
propane/L.P.G. (resistant to sulfur compounds)
* Manual shutoff valve
* Sediment trap
* Tee joint
* Pipe wrench
* Phillips head screwdriver
* Other parts as required by local code
*Safety Glasses
*Gloves
PACKING LIST
1-Tucson Gas-Fired Heater
2-Decorative Ceramic Fiber Logs
2-Ember Screens
1-Charcoal Embers
1-Bag Platinum Bright Embers
1-Owner’s Manual
1-Thermostat
1-40’ Thermostat wire
1-L.P. Fuel Conversion Kit
1-Warranty Validation Form
1- Stone Set (installation instructions included in kit)
Note: Vent kits are supplied separately. Failure to
use the venting components suggested by
Hearthstone will void your warranty.
UNPACKING AND INSPECTION
UNPACK AND INSPECT FOR DAMAGE
The Tucson is packaged by the manufacturer to
withstand normal shipment without damage.
However, damage can occur during transit so take
care to inspect for damage when unpacking and
installing the unit. If any damage or missing parts
are detected, immediately contact your dealer.Do
not install or put into service a damaged or
incomplete heater.
The stone set is packaged separately. Carefully
remove and set aside the stones. Use the protective
wrapping material to temporarily protect the stones
from chipping and damage while the unit is
inspected and installed.
Inspect the Tucson for visible 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 dents. The enameled cast
iron should be free of chips or cracks. If visible or
concealed damage is found or suspected, contact
your dealer for instructions.
With the top grill removed and set aside, undo the
lag bolts that fasten the unit to the pallet. Take care
not to mar or chip the enameled legs. Lift the stove
off the pallet and set it into place.
The decorative ceramic fiber logs supplied with the
Tucson are contained within the firebox. Always use
great care when handling the decorative ceramic fire
logs as they are fragile and subject to damage and

Hearthstone Quality Home Heating Products, Inc. Tucson Model 8720
13
breakage if handled roughly. Open the firebox door
using a 5/32”hex wrench screwdriver and inspect the
logs for damage. If a broken log is encountered,
contact your dealer for replacement logs. Otherwise,
set the logs aside until called for during the
installation.
To install the stones, use the instructions that are
supplied with the stone set.
HEARTH REQUIREMENT/FLOOR
PROTECTION
The Tucson may be placed on a non-combustible
surface or wood floor. For placement on carpeting,
vinyl tile or other combustible materials, the
appliance must be installed on a metal or wood
panel extending the full width and depth of the
appliance. Installations must meet local codes.
CLEARANCE TO COMBUSTIBLES
Due to high surface temperatures, the unit 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 heater. When
positioning the unit always maintain adequate
clearances around air openings into the combustion
chamber and allow for adequate ventilation.
Minimum clearances to combustibles must be
maintained as shown in the illustrations in figures 4-
7.
Note: The rear clearance to combustibles will be
determined by either the unit’s or the vent pipe’s
minimum clearance, (A refer to Figures 6+7)
depending on whether the installation calls for
vertical rise within the room or a rear exit, through-
the-wall vent pipe.
Be sure to consider the need for access to the gas
control valve access door on the front of the unit as
well as full access for periodic cleaning and
servicing. Also consider the location of the Optional
Blower Fan.
NOTE: These clearances represent minimum
distances in all cases, which, through testing
in an independent laboratory to ANSI and
CSA standards, will prevent fire or
spontaneous combustion. We do not control
the combustible materials exposed to heat
by this product; therefore, an assessment
must be made by the installer to prevent
consequential damage of walls and flooring.
2.00
2.00
14-1/2"
10-1/4"
Figure 4: Corner Clearances to Combustibles
12-1/2"
6"
2.00
2.00
Figure 5: Minimum Wall Clearance to
Combustibles

Hearthstone Quality Home Heating Products, Inc. Tucson Model 8720
14
Figure 6: Mantle Clearance to Combustibles
Figure 7: Wall Clearance to Combustibles
VENTING
Normally Aspirating Chimneys
The Tucson is a highly efficient gas heater. With
operating efficiency as high as 82%, most heat
output is retained within the living space, with
minimal heat leaving the room via the chimney.
However, some heat is required in all chimneys in
order to establish and maintain a draft. Since most
of the heat is retained in the living space with
minimal heat entering the chimney, it is imperative
that the chimney/venting system be properly sized
and installed in order to establish and maintain the
draft required for the unit to function.
The Tucson must be properly connected to a 4" (102
mm) diameter type B-1 vent which is constructed
and installed in accordance with NFPA54 and
NFPA211. Single wall vent pipe may be used within
the same room as the Tucson so long as adequate
(6" or 152 mm) clearance is maintained from the
single wall pipe to combustible surfaces. The single
wall vent pipe must connect to double-wall type B-1
vent from thereon. The minimum clearance from
type B-1 vent to combustibles is 1"(25 mm).
Connect the single wall or B-1 vent pipe to the flue
collar located on the rear surface of the unit using 3
sheet metal screws. For wall, roof or partition
penetration, refer to the current edition of ANSI
Z223.1 or CAN1-B149 for instructions and
clearances to combustibles. The Tucson can be
connected to an existing, properly constructed
masonry or prefabricated chimney so long as the
type B-1 vent is extended through the entire length
of the chimney. An annual inspection is required to
confirm that the vent is unobstructed. The vent can
not be connected with a flue serving a solid fuel
appliance. It however, can be installed to a flue
serving another gas or oil appliance, so long as it is
in accordance with the National Fuel Gas Code.
Type B-1 vent pipe is intended primarily for
installation inside buildings to provide an essentially
vertical passageway for flue gases from the vented
gas appliance to the outside air. When it is
impractical to install B-1 vent pipe inside a building,
it may be installed outdoors provided that it is: 1)
certified for outside installation, 2) installed in
accordance with manufacturer’s installation
instructions and 3) adequately chased (enclosed)

Hearthstone Quality Home Heating Products, Inc. Tucson Model 8720
15
and insulated (per Venting Tables, Category I-
Central Furnaces, AGA and GAMA current edition;
Standards for Gas Vents, National Standards of
Canada and CAN/CGA-B149.1-M91). Exterior B-1
vent pipe passing through an unused masonry
chimney flue is not considered to be exposed to the
outdoors.
Four-inch flexible pipe can be used in place of B-1
vent pipe wherever it is impractical or impossible to
install rigid Type B-1 vent pipe. However, flexible
pipe is less desirable than B-1 vent pipe, because
there is a greater heat loss along the length of flex
pipe, which may produce an unacceptable draft
Draft Hood/Down Draft Sensor/Spill Switch
The Tucson has a draft hood as part of its rear
assembly. The draft hood must not be altered or
obstructed. The Tucson must be installed so that
the draft hood is in the same atmospheric pressure
zone as the combustible air inlet for the unit. The
Tucson cannot and must not be connected to an
outside air source; the unit must take its combustion
air from the living space in which it is installed. The
draft hood is equipped with a safety shutoff down
draft sensor switch (spill switch), which is located in
the draft hood just beneath the flue collar on the rear
of the unit. This switch is designed to sense a loss
of draft within the chimney. The down draft sensor
switch is wired in series with the pilot thermocouple
and is typically in the closed position.
Should the Tucson fail to establish or lose draft while
in operation, hot exhaust gasses will spill into the
room through the bottom of the draft hood instead of
exiting the draft hood via the flue collar and venting
to the outdoors. When this undesirable down draft
condition occurs the hot gasses spilling out of the
draft hood will heat the spill switch causing it to
open, which turns the unit off.
Do not modify, disconnect or otherwise defeat the
purpose of the down draft sensor switch. If your
stove shuts off during normal operation, it is
indicative of an unsafe venting condition, which must
be corrected. Operation of this unit when not
properly connected to a properly installed and
maintained venting system or tampering with the
vent safety shutoff system can result in carbon
monoxide (CO) poisoning and possible death.
Power Venting
For applications where it is impractical or impossible
to exit B-1 vent pipe to above the existing roof line,
the Tucson can be vented using a power vent. A
power vent is essentially a specialized electric fan
mounted on the outer wall of the building, which is
connected to the heater via the flue pipe. When the
thermostat calls for heat, the power vent turns on
and creates a draft in the flue pipe similar to the draft
created by a properly functioning conventional
chimney. The Tucson operates in a normal fashion,
satisfied by the simulated draft. A series of
interlocking safety devices prevents operation of the
heater unless the power vent is operating properly.
Both the Tucson and the power vent are controlled
by the wall thermostat and neither will operate if
there is a power failure. For installations requiring
power venting, use only an AGA (U.S.) Or CGA
(CANADA) listed unit. The power vent supplier will
in turn supply the power vent installations.

Hearthstone Quality Home Heating Products, Inc. Tucson Model 8720
16
ELECTRICAL CONNECTIONS
NOTE: OPEN VALVE DOOR UNDER THE ASH LIP FOR ELECTRICAL AND GAS CONNECTIONS.
THERMOSTAT
The ON/OFF/T’stat switch or wall mounted
thermostat controls the Tucson. We recommend
installation of the thermostat for more comfortable
performance, however you may still override the
thermostat by setting the switch to “ON”. 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.
REMOTE CONTROL
There are two different optional remote controls.
Both of the remote controls are capable of turning
the unit on and off. One of the optional remotes also
allows you to control the temperature of the stove,
(in the same way the thermostat controls the heater),
from anywhere in the vicinity of the unit. If “ON” &
“OFF” are the only controls required, Kit #90-56912
can be used. If you would like to control the
temperature via the remote control, use Kit #90-
56914. Installation instructions are provided with the
kits.
THERMOSTAT PLACEMENT
The thermostat should be placed in the same room
or living space as the unit. Typically 5’ (1.5m) 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.
THERMOSTAT WIRING
When installing the thermostat, avoid cutting
and splicing the thermostat wire. This can create
a voltage drop that will cause your unit to run
improperly
Connect the thermostat to the Tucson using no more
than 40’ (12 m) of the provided insulated thermostat
wire. Ensure to leave a small coil of thermostat wire
behind the Tucson so that the unit can be moved out
of position for servicing and cleaning.
Connect one of the thermostat wires to the gas
control marked TH and the other to the yellow wire
coming from the on/off T’stat switch. When making
these connections, position the thermostat wire so
that it extends towards the wall behind the Tucson,
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.

Hearthstone Quality Home Heating Products, Inc. Tucson Model 8720
17
WIRING INSTRUCTIONS
CAUTION: LABEL ALL WIRES PRIOR TO DISCONNECTION WHEN SERVICING CONTROLS. WIRING ERRORS
CAN CAUSE IMPROPER AND DANGEROUS OPERATION. VERIFY PROPER OPERATION AFTER SERVICING.
(ATTENTION: AU MOMENT DE L’ENTRETIEN DES COMMANDES, ÉTIQUETEZ TOUS LES FILS AVANT LE
DÉBRANCHEMENT. DES ERREURS DE CÂBLAGE PEUVENT ENTRAÎUN FONCTIONNEMENT INADEQUATE ET
DANGEREUX.) THE PROPER LOCATION OF WIRE CONNECTIONS IS SHOWN IN FIGURE 8.
BkBk
Y
V
Bk
W
BkBk
Bk
W
G
G G
W
Wiring Diagram - Tucson
Wiring Color KEY:
Hearthstone
10 20 30
50 70 90
c
OFF
O
W
YG
Bk V
Y
10 20 30
c
50 60 70 80 90
OG
R
Bk
Br
Bk
WBk
B
W
Figure 8: Wiring Diagram

Hearthstone Quality Home Heating Products, Inc. Tucson Model 8720
18
NOTE: If an optional blower is installed now or in the future, ensure the gas line is installed as close to the
floor as possible.
Figure 9: Gas Control Valve
GAS SUPPLY &
CONNECTIONS
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 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) OR CAN/CGA B149 INSTALLATION CODE.
GAS CONNECTIONS
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 3/8” 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 refer to local codes.
CAUTION: CHECK GAS TYPE!
GAS SUPPLY
This appliance and its individual shutoff valve must
be disconnected from the gas supply piping system
during any pressure testing of that system at test
pressures in excess of ½ psig. 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 greater than ½ psig.
GAS PRESSURE ADJUSTMENT
NOTE: A QUALIFIED TECHNICIAN MUST
PERFORM THIS PROCEDURE!
ONCE CONNECTED TO THE GAS SUPPLY,THE
SUPPLY LINE AND MANIFOLD GAS PRESSURES
MUST BE TESTED.THE SUPPLY LINE PRESSURE
IS TESTED,TO ENSURE IT MEETS THE MINIMUM
GAS SUPPLY PRESSURE AS LISTED IN THE
SPECIFICATIONS FOR THE TYPE OF FUEL IN USE
(NATURAL GAS OR LP), BY CONNECTING A
MANOMETER TO THE SUPPLY LINE AND
ADJUSTING THE INCOMING PRESSURE IF
NECESSARY TO MEET THE REQUIRED SUPPLY
LINE PRESSURE AS LISTED IN SPECIFICATIONS.
THE MANIFOLD PRESSURE TAP ON THE GAS

Hearthstone Quality Home Heating Products, Inc. Tucson Model 8720
19
CONTROL VALVE,REFER TO FIGURE 9FOR
LOCATION.
3" MIN.
Cap
Nipple
To Equipment
Inlet Tee Fitting
Gas Supply
Inlet
Figure 10: Sediment Trap (Required)
LOG PLACEMENT
CAUTION: FRAGILE! HANDLE LOG SET WITH
CARE. ALWAYS WEAR GLOVES AND SAFETY
GOGGLES WHILE HANDLING THE LOG SET.
Only the decorative ceramic fiber log set supplied
with the unit should be placed in the firebox. Do not
place any other ceramic logs, wood logs, or other
materials in the firebox. If the log set is damaged or
broken contact your dealer for replacement. The
decorative ceramic fiber log set will last a long time;
however, they will break if subjected to rough or
improper handling. 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. If the log set
does not set into the firebox exactly as outlined,
contact your dealer for assistance.
INSTALLATION OF THE LOG SET
(Refer to figures 11 & 12 for log set assembly)
1. Open the front door using a 5/32 hex wrench.
Loosen the bolt that fastens the doorknob to the
door. It also unfastens the door from the firebox
by turning it counterclockwise. Be careful not to
chip the 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 Main Log (1) in the firebox
against the center of the back wall.
4. Gently place the Top Log (2) on top of the Main
Log (1), inserting the posts into the holes in the
bottom side of the Top Twig.
5. Spread evenly across the Ember Screens, one
layer high, the 2 ounces of Charcoal Embers.
You will not need to use all of the Charcoal
Embers. Keep the rest to use in the future.
6. Open the bag of Platinum Bright Embers. Fluff
the pieces and spread randomly over the logs
and burner.
7. With a 5/32” hex wrench, use the bolt to fasten
the door to the firebox. Make sure the door and
knob are properly secured to the firebox before
turning the unit on. Be careful not to chip the
enamel when fastening the door.
Figure 11: Log Set

Hearthstone Quality Home Heating Products, Inc. Tucson Model 8720
20
REMOVAL OF LOG SET
CAUTION: The 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.
To remove the log set, follow the Installation of Log
Set instructions in the reverse order.
Figure 12: Log Set Assembly.
LIGHTING THE UNIT FOR
THE FIRST TIME
WARNING: IF YOU DO NOT FOLLOW THESE
INSTRUCTIONS EXACTLY, A FIRE OR
EXPLOSION MAY RESULT CAUSING PROPERTY
DAMAGE, PERSONAL INJURY OR LOSS OF LIFE.
CAUTION: LIGHTING THE TUCSON FOR THE
FIRST TIME AND ADJUSTMENTS TO THE UNIT
SHOULD BE PERFORMED BY QUALIFIED
SERVICE PERSONNEL.
SMOKE AND FUMES WARNING
When lit for the first time, the Tucson 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.
BREAK-IN WARNING
The natural stones used in the assembly of the
Tucson were polished using a water-based polishing
system prior to the assembly of the unit. Any
residual moisture in the stones must be removed
slowly to avoid damaging the stones. This is
accomplished by adhering to the following break-in
procedure.
BREAK-IN PROCEDURE
When lit the first time, the Tucson should be burned
for no more than 15 minutes, and then allowed to
cool for 1 to 2 hours. This gentle warming and
cooling of the unit will allow any residual moisture in
the stones to evaporate slowly. Once this break-in
procedure has been completed, the Tucson can be
burned at will with no time restrictions on the length
of burn.
ODORS AND IMPURITIES
A heater of this type may produce odors during
heater operation due to impurities that may exist in
the immediate area. Sources of impurities can be
cleaning solvents, paint solvents, cigarettes, scented
candle smoke, pet hair, dust, adhesives, new carpet,
and/or textiles. Such odors will dissipate in time.
However, opening a window or otherwise providing
additional ventilation to the area can alleviate the
condition initially. If any odor persists, contact your
dealer or an authorized service technician.
PILOT LIGHT WARNING
The Tucson has a piezoelectric spark igniter (the
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 than the piezoelectric spark.
PREPARE FOR LIGHTING
Prepare for the lighting procedure by adjusting the
thermostat (if equipped) 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 control knob 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.