HearthStone STERLING "G" 8531 User manual

STERLING “G” DIRECT-VENT (8531)
Gas Fired Direct-Vent Room Heater
Owner’s Manual
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.
vDo not store or use gasoline or other
flammable vapors and liquids in the vicinity
of this or any other appliance.
vWHAT 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
neighbors phone. Follow your gas suppliers
instructions.
•If you cannot reach your gas supplier, call
the fire department.
v
Installation and service must be performed
by a qualified installer, service agency or
the gas supplier.
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.
vNe pas entresposer ni utiliser d’essence
ni’autrevaperurs ou liquides inflammables
dans le voisinage de cet apprareil ou de
tout autre appareil.
vQUE 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.
vL’installation et
service doit être exécuté par un
qualifié installer, agence de service ou le
fournisseur de gaz.
317 Stafford Avenue
Morrisville, Vermont 05661
E-Mail: [email protected].
6400-40427 05-22-03

HearthStone Quality Home Heating Products MODEL Sterling “G” Direct-Vent
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TABLE OF CONTENTS
TABLE OF CONTENTS ...................................................................................................................................1
Introduction..................................................................................................................................................2
Owner Information Record.............................................................................................................................3
High Altitude Conversion...............................................................................................................................4
Warning-Caution-Safety Information............................................................................................................5
Unpacking and Inspection..................................................................................................................................6
Installation..........................................................................................................................................................7
Positioning Your Stove...................................................................................................................................7
Hearth Requirements ......................................................................................................................................7
Log Placement Within Unit............................................................................................................................9
Log Set Removal............................................................................................................................................9
Allowable Venting Configuration Graphs....................................................................................................10
Restrictor Plate Installation And Settings.....................................................................................................16
Electrical Connections ..................................................................................................................................18
High Altitude Adjustments...........................................................................................................................19
Gas Connection............................................................................................................................................19
Gas Pressure Adjustment..........................................................................................................................19
Operation..........................................................................................................................................................20
Before the Stove is Lit..................................................................................................................................20
Lighting Instructions ....................................................................................................................................21
To Turn Off Gas To Appliance....................................................................................................................21
Initial Adjustments .......................................................................................................................................22
Variable Output Control...........................................................................................................................22
Air Shutter Adjustments...........................................................................................................................22
Pilot Adjustment .......................................................................................................................................23
Daily Operation............................................................................................................................................23
Routine Maintenance And Care .......................................................................................................................24
Servicing And Trouble-Shooting .....................................................................................................................25
How To Obtain Parts And Service ...............................................................................................................25
Broken Glass On Front Door........................................................................................................................25
Trouble-Shooting Guide...............................................................................................................................25
Optional Blower Fan........................................................................................................................................27
Exterior Termination Clearances......................................................................................................................28
Electrical Schematics........................................................................................................................................29
Gas Control Valve ............................................................................................................................................30
Replacement Parts............................................................................................................................................31
Simpson Dura-Vent Parts:................................................................................................................................31
Specifications ...................................................................................................................................................33
LIMITED WARRANTIES.......................................................................................................................34

HearthStone Quality Home Heating Products MODEL Sterling “G” Direct-Vent
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INTRODUCTION
Congratulations on your purchase of a HearthStone® Sterling™ gas-fired direct-vent fireplace
heater. The Sterling incorporates the latest in energy efficient gas technology which will provide
you with clean, efficient heat for years to come. The combination of natural stones with cast iron
gives the Sterling a pleasing look which can be maintained with minimum care.
To own a HearthStone is to make a statement -a statement of your appreciation and
understanding of exceptional quality. Your Sterling is manufactured using imported cast iron and
stone which combine to enhance the decor of any home. Handcrafted in Vermont, your HearthStone
stove is a fine piece of furniture which will complement any room, even when it is not burning.
However, when your Sterling is burning, it provides the warmth of radiant heat from the granite,
marble and soapstone tiles.
Your Sterling is easy to use too. There is no chopping, hauling or stacking wood; simply adjust
the temperature on your wall-mounted thermostat and it will keep your home at a comfortable
temperature throughout the year.
Welcome to the HearthStone® family.
Please read this manual carefully to familiarize yourself with the safe installation, operation, and
maintenance of your Sterling. Should you have any questions, do not hesitate to contact your
HearthStone Dealer.
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 MODEL Sterling “G” Direct-Vent
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Owner Information Record
Record here all relevant information concerning the purchase and installation of your Sterling 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 entire Owner's Manual before installing or operating the Sterling gas fired heater. Retain this
manual for future reference.
NOTE: Your stove has been manufactured to operate at certain altitudes with LP or Natural Gas only.
Please note the identification tag (as below) which appears on the rear of the stove. Use the space below to
record the data on your tag.
This appliance has been converted to: Fuel Type: ____LP ____NG
This appliance has been converted for use at an altitude of_________ Input (Btu/h)___________Orifice
sizes:______/______ ( F / R )
Manifold Pressure____________
Date of Conversion:_____/_____/_____ Converted by:______________

HearthStone Quality Home Heating Products MODEL Sterling “G” Direct-Vent
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High Altitude Conversion
For installation from 610-1370 meters (2000-4500ft.) The orifice sizes (DMS) for natural and propane gas
are 47 and 56 (front),55 (rear) respectively. See data plate for additional information. For high altitude
installation consult the local gas distributor or the authority having jurisdiction for proper rating methods. If
the installer must convert the unit to adjust for varying altitudes, the information sticker must be filled out by
the installer and adhered to the appliance at the time of conversion.
This appliance has been converted for use at an altitude of—————————–——————————
Orifice size————————— Manifold Pressure————————————————
Input(Btu/h)————————————————Fuel Type——————————————————
Date of Conversion——————————————— Converted By———————————————
—
Cet appareil est equipé pour des altitudes compries entre 2000 et 4500 pieds (610-1370-m) seulement.
Cet appareil a été converti au———————————————————————
Injecteur————————————————————————————————
Pression à la tubulure (alimentation—————————————————————
Déoit calorifique——————————————————————————————

HearthStone Quality Home Heating Products MODEL Sterling “G” Direct-Vent
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Warning-Caution-Safety Information
CAUTION
This gas appliance must be operated and maintained
according to the instructions contained in this owner's
manual. The unit must be inspected before use and at
least annually by qualified service personnel. More
frequent cleaning may be required due to excessive lint
from carpeting, bedding material, etc. It is imperative
that control compartments, burners, and circulating
air passageways of the appliance be kept clean.
WARNING
Do not use this appliance if any part has been under
water. Immediately call qualified service personnel to
inspect the appliance and to replace any part of the
control system and any gas control which has been
under water.
WARNING
This gas appliance must be connected to a properly
installed and maintained venting system (chimney).
Only VENTING SYSTEMS TESTED AND APPROVED FOR
THIS MODEL STERLING may be used for installation.
Absolutely no substitutions may be used. Tampering,
modifying, disconnecting or overriding the vent safety
shutoff system may result in an unsafe or hazardous
condition which may lead to carbon monoxide
poisoning and loss of life.
HOT SURFACES
Certain exposed surfaces of the Sterling will reach high
temperatures during normal operation. Clothing or
other flammable material should not be placed on or
near the appliance. Do not place objects that may
obstruct air circulation on, under or near this heater.
Clearances to combustibles must be maintained as
specified elsewhere in this manual. The Sterling
should be located out of traffic and away from
furniture, draperies, clothing and flammable material.
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 or clothing ignition.
Children should be carefully supervised when in the
same area as the Sterling heater. Do not leave children
unattended in the vicinity of this unit.
FIRE HAZARD
Do not store or use gasoline or other flammable vapors
and liquids in the vicinity of this appliance. Clean the
area around, under and behind the unit on a regular
basis to prevent the accumulation of dust and lint.
ELECTRICAL HAZARD
This appliance is equipped with a three-prong
grounded plug if equipped with an optional blower fan.
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. The
appliance must be electrically connected and grounded
in accordance with local codes or with the current
NFPA 70 National Electric Code or CSA C22.1-
Canadian Electrical Code.
CAUTION
This unit has a standing pilot light which is lit using a
piezoelectric spark generator as described elsewhere in
this manual. Never attempt to light the pilot light 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 Sterling
gas control valve and immediately contact qualified
service personnel for assistance.
WARNING
This unit is designed to burn either natural gas or liquid
propane as specified. Never burn paper, wood or any
other materials in this unit.
CERAMIC LOGS
This unit is supplied with decorative ceramic fiber
logs. If the decorative ceramic fiber logs become
damaged or broken they must be replaced with similar,
approved decorative ceramic fiber logs supplied by the
manufacturer. Do not replace the manufacturer-
supplied decorative ceramic fiber logs with
unapproved ceramic logs, real wood logs or any other
material.
WARNING
Never vent the gas heater to other rooms or buildings.
Do not burn the gas heater with the viewing door open.
Do not burn gas heater with broken glass. Only open
front door for routine service. Do not slam door or
strike glass. Venting terminals shall not be recessed
into a wall or siding.

HearthStone Quality Home Heating Products MODEL Sterling “G” Direct-Vent
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VENTILATION AROUND UNIT
The Sterling requires a free flow of air to provide
ventilation around the unit. Your Sterling Direct-Vent
gets its combustion air through the venting system, and
will function well in extremely air-tight structures as
well as less air-tight structures.
CAUTION
Any shield, door, safety screen or component removed
for servicing the Sterling must be replaced prior to
operating the unit. If you believe that your Sterling is
not performing properly in any way whatsoever,
immediately discontinue operation until the unit has
been inspected and approved for continued operation
by qualified service personnel.
WARNING
This unit is equipped with a delayed ignition safety
switch. In the case of a delayed ignition, this switch
may only be reset by a qualified service technician
after careful inspection of all seals and gaskets.
WARNING
Do not clean glass when hot.
WARNING
Do not operate this stove with glass removed, cracked
or broken. Do not substitute materials. Replacement
of glass should be done by a licensed or qualified
service person.
UNPACKING AND INSPECTION
PACKING LIST
1 -Sterling Gas Fireplace Heater
3 -Decorative Ceramic Fiber Log set
1 -Bag of Charcoal Embers
1 -Ember Screen
1 -Owner's Manual
1 -Warranty Card
1 -Thermostat with 40' Thermostat Wire
INSPECT FOR DAMAGE
Do not install or put into service a damaged or incomplete heater.
Prior to removing the shipping carton, inspect the carton for visible signs of damage. Carefully remove the shipping
carton. We carefully package the Sterling to withstand shipment without
damage. However, damage can occur during transit and handling, so take care
to inspect for damage when unpacking and installing the unit.
The unit should appear 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 or dents. The enameled cast iron (if enameled) should be free of
chips or cracks. If visible or concealed damage is found or suspected, contact
your dealer for instructions.
Note
The three top stones are not cemented or otherwise permanently fastened in
place.
Carefully remove and set aside the three top stones. Use the protective
wrapping material to temporarily protect the stones from chipping and damage
REAR LOG
FRONT LOG
EMBERS
EMBER SCREEN

HearthStone Quality Home Heating Products MODEL Sterling “G” Direct-Vent
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while the unit is inspected and installed.
With the top stones removed and set aside, undo the lag bolts which fasten the unit to the pallet. Take care not to mar
or chip the enameled legs on enameled units. Lift the stove off the pallet and set it into place. For information
regarding hearth requirements and minimum clearances, refer to HEARTH REQUIREMENTS and STOVE CLEARANCES TO
COMBUSTIBLES.
The decorative ceramic fiber logs supplied with your Sterling are wrapped and shipped inside the firebox. Gently lift
one side and swing out the log assembly. The Embers are packed separately inside the firebox. These parts are fragile
and subject to damage or breakage if handled roughly. You should avoid touching other parts of your body after
handling, and wash your hands immediately. Ceramic fiber will temporarily irritate exposed skin. Inspect the logs for
breakage. If a broken or damaged log is encountered, contact your dealer for replacement logs.
INSTALLATION
The Sterling is a sophisticated gas-fired appliance.Installation must be completed by qualified service personnel. Any
attempt by unqualified personnel to complete venting, gas and electrical connections and other technical components
of the installation procedure with which he/she is not familiar and technically qualified will void the warranty and may
result in carbon monoxide poisoning, explosion, fire, damage or loss of life. Do not attempt to complete any part of
the installation of this unit unless technically qualified to do so.
Positioning Your Stove
1. Place stove in desired location. Maintain clearance from combustibles.
2. Determine the vent configurations.
3. Layout fan location and plan gas line run. Refer to Optional Blower Fan (page 31).
4. Find the area of wall penetration. The hole must be positioned so that the vent has a minimum ¼"per foot rise
toward the termination.
5. Be sure there is no wiring or plumbing in the chosen location. The hole location must meet all local & National
codes and cannot be easily blocked or obstructed (e.g., snow drifts).
Hearth Requirements
No floor protection is required if
the stove is installed on non-
combustible flooring. If the stove
is installed on a combustible floor,
it must meet one of the following
criteria.
1. The stove is installed on a non-
combustible hearth pad with a
R-value of 1.1 that extends
the full width and depth of the
stove including 16" in front of
the stove (measured from the
glass).
2. The stove is installed on a platform with a minimum of 4"(D.V.) in height, extending no further than the ash lip. If
the platform is covered with carpet or vinyl tiles it must be protected by a metal or wood panel that extends the full
width and depth of the stove.
3. The stove is installed on a wood floor or, a wood or metal panel extending the full width and depth of the stove and
has one of the following:
a. A non-combustible hearth pad with a R-value of 1.1 and a minimum measurement of 30"Wx16"D.
b. A hearth pad is not required when using the optional front door screen(item # 95-57200). This
screen must be attached in accordance with the technical data sheet provided with the screen.
4" (102mm) Minimum
Sterling DV Hearth Requirements
Floor Platform
criteria 2
16"
Floor
criteria 1 and 3a
(from glass)
Non-combustible
hearth pad
(30"W x 32"D)
Sterling DV Hearth Requirements
(762mmWx 813mmD)

HearthStone Quality Home Heating Products MODEL Sterling “G” Direct-Vent
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Stove Clearances To Combustibles
Due to high surface and radiant temperatures, the Sterling 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 Sterling heater. Always
maintain adequate clearances around the stove for ventilation.
When positioning the unit be sure to consider the need for access to the gas control valve access door on the lower
right side of the unit as well as full access for periodic cleaning and servicing. Also consider the location of the
Optional Blower Fan.
Minimum clearances to combustibles must be maintained as shown. Note that the rear clearance to combustibles will
be determined by either the unit's or vent pipe's minimum clearance, depending on whether the installation calls for a
top exit (vertical) vent within the room or a rear exit (horizontal), through-the-wall vent.
Minimum clearances to combustibles must be maintained as follows:
18" (458mm)
14" (355mm)
3" (76mm)
3" (76mm)
Corner Installations Alcove or Mantel Installations
2" (51mm)
Floor
Sterling DV Minimum Clearance to Combustibles
4" (102mm)
Parallel Installations
2" (51mm)
1" (26mm)
2" (51mm)

HearthStone Quality Home Heating Products MODEL Sterling “G” Direct-Vent
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Log Placement Within Unit
CAUTION
Fragile! Handle the log set with care. Always wear gloves and safety goggles while handling the logs set.
Position the front and rear burner tubes in their cradles firmly. Center the ember screen directly on the front burner
tube, with the cut out set over the pilot. The rear log fits tightly to the rear of the firebox.
Note
There is one “locator” slot in the base of the rear log to aid in correct placement.
When setting the log, place the rear log over the “locator” and push log firmly against rear wall of the firebox. The
next piece to install is the front log piece. Stand this piece directly between the two burner tubes. The middle log will
now fit over the peg locators provided on the two larger logs. Open the bag of embers and place in a random pattern on
the screen. Do not place embers on or in front of the pilot.
Note 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.
Log Set Removal
To remove the log set, follow the Installation of Log Set
instructions in the reverse order.
Sterling DV Log Set Assembly
SCREEN
EMBERS
EMBER
SIDE
VIEW
MIDDLE LOG
REAR LOG
FRONT LOG
LOG LOCATOR
FRONT BURNER
TUBE
TUBE
REAR BURNER
AIR SHUTTER
Sterling DV Assembled Log Set
Sterling DV Log Set Assembly
FRONT LOG
REARLOG
SIDE
VIEWVIEW
FRONT
SLOT
LOCATOR
PEG
PEG
EMBER SCREEN
EMBERS

HearthStone Quality Home Heating Products MODEL Sterling “G” Direct-Vent
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Allowable Venting Configuration Graphs
WARNING
This appliance must not be connected to a chimney flue serving a separate solid-fuel burning appliance.
The only type of vent pipe approved for use with your Sterling Direct-Vent stove is Simpson Dura-Vent's GS Direct-
Vent Pipe. After determining the venting configuration for your stove, select the Simpson Dura-Vent system and
HearthStone's Dura-Vent exit starter collar adaptor that will accommodate your installation.
Note
Refer to Appendix A Exterior termination Clearances, for determining where the termination cap position will be.
Refer to Appendix D Simpson Dura-Vent Parts, for part numbers and descriptions of the venting components you need.
If the vent-air intake system is disassembled for any reason, reinstall per the instructions provided for the initial
installation.
A. Fireplace & Existing Chimney Installation
The vent/air intake termination
clearances above the high side of an
angled roof as follows:
Roof Pitch Feet Meters
Flat to 6/12 1 0.3
7/12 to 9/12 20.6
10/12 to 12/12 41.2
13/12 to 16/12 61.8
17/12 to 21/12 82.4
The use of an existing chimney as an air intake is not covered under the AN
SI Z21.88
-
1998•CSA
2.33-
M98 test methods and the resulting ITS/WHI product certification. The code Authority
Having Jurisdiction must be consulted prior to proceeding with this installation method.
Existing Chimney

HearthStone Quality Home Heating Products MODEL Sterling “G” Direct-Vent
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B. Horizontal Terminations for 5"x 8" Pipe

HearthStone Quality Home Heating Products MODEL Sterling “G” Direct-Vent
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C. Horizontal Terminations for 4"x 6e" Pipe
Horizontal Terminations for 4"x 6e" Pipe

HearthStone Quality Home Heating Products MODEL Sterling “G” Direct-Vent
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D. Vertical Terminations -Straight or (2) 45OElbows (4"x 6e” Pipe Only)
Vertical Terminations-Straight or (2) 45EElbows (4"x6e" Pipe Only)

HearthStone Quality Home Heating Products MODEL Sterling “G” Direct-Vent
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E. Vertical Terminations -(1) or (2) 90OElbows (4"x 6e" Pipe)

HearthStone Quality Home Heating Products MODEL Sterling “G” Direct-Vent
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SIMPSON DURA-VENT OPTIONAL EXIT ADAPTORS
1. #95-60924HC: 4"X6E" REAR EXIT STARTER COLLAR ADAPTOR
Used in the following configurations:
-Straight back with vertical termination.
-Straight back (horizontal) to vertical with horizontal termination.
-Fireplace Liner Kits
MAXIMUM RISE = 27'
MINIMUM RISE = 2'
Can not be used as follows:
Straight back w/ horizontal
termination
2. #95-61223HA: 5"x 8" Rear Exit Starter Collar Adaptor
Used in the following configurations:
-Straight back with horizontal termination.
-Straight back to vertical to horizontal termination.
-Corner Installations.
MAXIMUM VERTICAL RISE = 3'
Cannot be used as follows:
-Straight back with vertical termination.
#95-60924HC
#95
-
61223HA

HearthStone Quality Home Heating Products MODEL Sterling “G” Direct-Vent
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3. #95-60924H: 4"x6e"Top Exit Starter Collar Adapter
Used in the following configurations:
-Straight up with vertical termination.
-Straight up with horizontal termination.
-Straight up (vertical) to horizontal with vertical termination.
MAXIMUM VERTICAL RISE = 27'
MINIMUM VERTICAL RISE = 2'
4. #95-61223HB: 5"x8"REAR EXIT STARTER COLLAR ADAPTER USED ONLY WITH THE #95-65000
BASIC VENTING KIT; BASIC VENTING KIT INSTRUCTIONS ARE INCLUDING WITH THE KIT.
Used in the following configuration:
-Straight back with horizontal
termination.
FOR USE ON 2"x4" OR 2"x6"WALLS
MAX OVERALL THICKNESS = 7½"
Restrictor Plate Installation And Settings
RESTRICTION PLATE
A vent restrictor plate is available for the appliance to adjust the flow rate of
exhaust gases (draft). In controlling the draft, it also changes the burn and the
aesthetics of the flame. Depending on the vent configuration, you may be required
to adjust the restrictor plate position.
The restrictor plate consists of a rotating shutter below the starter section of pipe
and an adjustment plate with index holes used to hold the shutter in a fixed
position. The restrictor plate has three settings, one (1) being the lowest and three
(3) being the highest. This ensures proper flames for the wide variety of vent
configurations and efficiency. The charts in the venting configurations show if a
restrictor plate is required, and which position the vent restrictor plate must be in. For a fast moving flame with lots of
action use a lower setting. For a slow, lazy flame, a higher setting should be used.
Restictor Plate Setting
Locations
#95-60924H
#95
-
61223HB

HearthStone Quality Home Heating Products MODEL Sterling “G” Direct-Vent
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ADJUSTMENTS TO RESTRICTOR PLATE
Make sure the unit is cool before touching any part of the stove or venting. Remove the venting (if installed already)
before adjusting the restrictor plate. Once the venting has been set aside, check the Restrictor Plate screw location.
There are three locations that the restriction plate can be positioned. Refer to the Venting Configurations for
recommended restriction plate positions. Remove screw "A". Align hole on moveable shutter with hole in main plate
which corresponds to the appropriate chart setting. Replace screw "A", referring to the figure in the previous sectoin
for the various Restrictor Plate adjustment setting locations.Fasten the screw into the proper hole and tighten.
Note:
These positions are based on lab results and can have some variance.
EXIT STARTER COLLAR ADAPTOR INSTALLATION INSTRUCTIONS
The following installation instructions are intended for the exit starter collar that adapts the Sterling to Simpson Dura-
Vent. The Simpson Dura-Vent installation instructions and clearances to combustibles are available through Simpson
Dura-Vent. At no time should you by-pass the Termination Specifications or Stove Clearances to Combustibles
outlined in this manual or the Owner's Manual.
#95-60924HC: 4"x6-5/8"Rear Exit Starter Collar Adaptor
#95-61223HA: 5"x8" Rear Exit Starter Collar Adaptor
#95-61223HB: 5"x8" Rear Exit Starter Collar Adaptor
INNER COLLAR:
Locate the 8 screw holes where the inner collar attaches to the heat
exchanger. Remove the 4 existing screws (placed for shipping
purposes). Attach the inner collar and gasket (and restrictor plate
where applicable) with the 8 screws provided with the collar.
OUTER COLLAR:
Locate the 8 screw holes where the outer collar attaches to the heat
exchanger. Attach the outer collar and gasket with the 8 screws
provided with the collar.
You are now ready to install your venting.
5. #95-60924H: 4" x 6e" Top Exit Starter Collar Adaptor
INNER COLLAR:
Remove the short, inner collar piece from the inner 90Eelbow. Locate the 8 screw holes where the inner collar
attaches to the heat exchanger. Remove the 4 existing screws (placed for shipping purposes). Attach the inner collar
and gasket (and restrictor plate where applicable) with the 8 screws provided with the collar.
OUTER COLLAR:
Locate the 8 screw holes where the outer collar attaches to the heat exchanger. Place the outer piece up to the heat
exchanger, and at the same time, attach the inner 90Eelbow to the short, inner collar (already in place). Attach the
outer collar and gasket with the 6 screws provided with the collar. Be sure the outer collar flange is flush with the heat
exchanger.
Note that the top of the outer collar flange folds up over the top of the stove. Once the collar is in place, mark and drill
the two top holes using a power drill and 5/32" drill bit. Make sure the top lip of the collar flange is firmly pressed
against the stove before drilling. Drill the holes as far forward within the hole to provide maximum support. After
drilling, install the last two screws.
You are now ready to install your venting.
Restrictor Plate
Installation
1. Restrictor Plate
2. Gasket
3. Inner starter
4. Gasket
5. Outer Starter

HearthStone Quality Home Heating Products MODEL Sterling “G” Direct-Vent
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Connections
Electrical Connections
THERMOSTAT
The Sterling requires a wall-mounted thermostat for operation. The thermostat controls the unit by "calling for
heat" and turning the unit on when the room is cold, and turning the unit off once the room has warmed sufficiently to
satisfy the thermostat.
The Sterling thermostat is controlled by a 750 millivolt DC two-wire circuit. Both the thermostat and 40 feet
of thermostat wire are included with the Sterling as standard equipment.
THERMOSTAT PLACEMENT
The thermostat should be placed in the same room or living space as the Sterling, typically 5' (1.5 m) off the
floor and away from areas of draft, direct sunlight or other influences which would 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, a nearby drafty window, etc.
Placement of the thermostat on an inside wall rather than an outside wall is generally preferable. Do not place
the thermostat directly behind or too near the Sterling, otherwise every time the thermostat calls for heat and the unit
turns on, heat from the unit will immediately satisfy the thermostat and turn the unit off.
Note
Remove metal facade under ash lip for electrical and gas connections.
THERMOSTAT WIRING
The thermostat should be connected to the Sterling using 18-gauge insulated thermostat wire supplied. The
thermostat wire from the Sterling to the thermostat can be surface mounted or routed under the floor, through walls,
etc.
Connect one of the two conductor thermostat wires to the terminal on the gas valve marked "TH".Connect the
other to the yellow wire from the on/off T-stat switch assembly. When making these connections, position the
thermostat wire so that it extends towards the wall behind the Sterling, then towards the thermostat. Check to ensure
that the connections are secure and permanent.
At the thermostat, the thermostat wire should be connected to the two connection screws on the thermostat
base plate 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. The thermostat should be mounted level for proper operation and
accurate temperature control.
DELAYED IGNITION SAFETY SWITCH
The delayed ignition safety switch should be checked prior to lighting the stove. The rod should be in
the two notches on the top heat exchanger. The bottom of the rod should go through both holes in the switch
bracket.
WARNING
Do not attempt to defeat or override this safety switch. Tampering with it by any untrained person is dangerous and
will void the warranty. If there is a delayed ignition, the switch must be reset by a qualified gas technician.

HearthStone Quality Home Heating Products MODEL Sterling “G” Direct-Vent
19
Gas supply NOTICE
Aqualified technician must connect the heater to the gas supply and leak test the stove before it is approved for use.
Consult all local code. WARNING
The stove must be installed and connected in accordance with local codes, or in the absence of local codes, with the
current edition of the National Fuel Code ANSI Z223.1 !CAN/CGA B149 Installation Code.
High Altitude Adjustments
For high altitude installations consult the local gas distributor or the authority having jurisdiction for proper rating
methods. If the stove must be adjusted, the information sticker on page 6 (provided with the high altitude kit) must be
filled out completely and mounted to the stove per the instructions provided with the kit. This stove must be installed
in accordances with CAN/CGA 2.17 installation codes.
All the Sterlings are shipped from the manufacturer fully assembled and ready for natural gas operation with minor
adjustment. However, if the Sterling needs to be converted from natural gas to LP, conversion of the stove must be
performed by qualified service personnel using the manufacturer-supplied optional conversion kit. Follow the
conversion instructions supplied with conversion kit.
Gas Connection
The gas supply line connection is made to the Sterling’s gas control valve using a d" male N.P.T. fitting.
The supply line should be ½ "diameter pipe or tubing. We recommend a flexible line to avoid undue
mechanical load on the valve and to ease thread alignment.
The supply line must include a manual shut-off valve and union so that the unit can be disconnected for
servicing. The gas control valve has built in pressure taps for test gauge connections. Install a sediment trap
as close to the inlet as practical (per National Gas Code).
Gas Pressure Adjustment
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
(NG or LP). Connect a manometer to
the supply line and adjust the incoming
pressure if necessary to meet the
required supply line pressure as listed in
the Specifications. The manifold outlet
pressure is tested by connecting the
manometer to the manifold pressure tap
on the Gas Control Valve
The stove 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 (3.5 kPa). The Sterling 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 (3.5
kPa). 3" MIN.
Cap
Nipple
To Equipment
Inlet TeeFitting
GasSupply
Inlet
Sediment Trap