HearthStone STERLING "G" B-VENT 8521 User manual

STERLING “G” B-VENT(8521)
Gas Fired B-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 do
it 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” B-Vent
1
TABLE OF CONTENTS
TABLE OF CONTENTS ...................................................................................................................................1
Introduction..................................................................................................................................................2
Owner Information Record.............................................................................................................................3
Warnings -Cautions -Safety Information.....................................................................................................4
Unpacking And Inspection.................................................................................................................................5
Installation And Connections .............................................................................................................................6
Hearth Requirements ......................................................................................................................................6
Clearances To Combustibles ..........................................................................................................................7
Electrical Connections ....................................................................................................................................8
Thermostat..................................................................................................................................................8
Venting /Chimney Requirements...................................................................................................................8
Normally Aspirated Chimneys...................................................................................................................8
Draft Hood/Down Draft Sensor/Spill Switch.............................................................................................9
Power Venting............................................................................................................................................9
Gas Supply....................................................................................................................................................10
Gas Connection........................................................................................................................................10
Gas Pressure Adjustment..........................................................................................................................11
Log Placement Within Unit..........................................................................................................................11
Log Set Removal......................................................................................................................................11
Lighting the Unit for the First Time.............................................................................................................12
Lighting Instructions ................................................................................................................................13
To Turn Off Gas To Appliance................................................................................................................13
Initial adjustments ........................................................................................................................................14
Variable Output Control...........................................................................................................................14
Air Shutter Adjustments...........................................................................................................................14
Pilot Adjustments .....................................................................................................................................15
Daily Operation................................................................................................................................................15
Routine Maintenance and Care ........................................................................................................................15
Optional Blower Fan........................................................................................................................................16
Gas Requirements For Blower .....................................................................................................................16
Trouble Shooting..............................................................................................................................................17
Parts List...........................................................................................................................................................18
Specifications ...................................................................................................................................................18
SAFETY LABEL........................................................................................................................................19
ELECTRICAL SCHEMATICS ..................................................................................................................20
Optional Blower .......................................................................................................................................20
LIMITED WARRANTIES............................................................................................................21

HearthStone Quality Home Heating Products MODEL Sterling “G” B-Vent
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INTRODUCTION
Congratulations on your purchase of a HearthStone® Sterling™ gas-fired B-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” B-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” B-Vent
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Warnings -Cautions -Safety Information
NOTE
This gas appliance must be installed and
maintained by qualified service personnel. Failure
to properly install, adjust and maintain this gas
appliance may result in an unsafe or hazardous
condition which may lead to carbon monoxide
poisoning, fire, explosion, personal injury and loss of
life.
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.
HAZARD
This gas appliance must be connected to a properly
installed and maintained venting system (chimney).
This appliance is equipped with a down draft sensor
switch (vent spill switch). 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, in the absence of
local codes, 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.
FUEL WARNING
This unit is designed to burn either natural gas or
liquid propane as specified. Do not place candles on
top or above the stove. Never burn paper, wood or any
other materials in this unit, failure to comply may
result in property damage or personal injury.
SAFETY INFORMATION
This unit is supplied with decorative ceramic fiber
logs. If the decorative ceramic fiber become damaged
or broken they must be replaced with similar, approved
decorative ceramic fiber logs supplied by the
manufacturer. Do not replace the manufacturer-

HearthStone Quality Home Heating Products MODEL Sterling “G” B-Vent
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supplied decorative ceramic fiber logs with
unapproved ceramic logs, real wood logs or any other
material.
NOTE
The Sterling requires an adequate supply of air to
provide ventilation around the unit and to support
combustion. Most buildings have sufficient air
infiltration to satisfy these requirements. However,
extremely air-tight structures may require the
introduction of supplemental air from the outside to
allow for the proper operation of the unit.
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
Do not operate this appliance with the glass
removed, cracked or broken. Do not substitute
materials. Replacement of glass should be done by a
licensed or qualified service person.
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?entretien des commandes,étiquetez
tous les fils avant le débranchement. Des erreurs de
câblage peuvent entraîun fonctionnement inadéquat et
dangereux.
WARNING
Do not slam or strike glass door.
UNPACKING AND INSPECTION
PACKING LIST
1 -Sterling Vented Gas Fireplace Heater
3 -Decorative Ceramic Fiber Logs
1 -Bag of Embers
1 -Ember Screen
1 -Owner's Manual
1 -Warranty Card
1 -Thermostat with 40' Thermostat Wire
UNPACK AND INSPECT FOR DAMAGE
The Sterling is packaged by the manufacturer to withstand shipment without damage under most circumstances.
However, damage can occur during transit and handling, 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.
CAUTION
Fragile! Handle logs set with care. Always wear gloves and safety glasses, while handling the log set.
NOTE
The three top stones are not cemented or otherwise permanently fastened in place! Use the protective wrapping to
protect the from damage while the unit is being inspected and installed.

HearthStone Quality Home Heating Products MODEL Sterling “G” B-Vent
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Prior to removing the shipping carton, inspect the carton for visible signs of damage. Carefully remove the
shipping carton. Carefully remove and set aside the three top stones.
Inspect the Sterling for visible or concealed damage. The unit should appear square and true. The sheet metal parts
should be smooth and free of bends or dents. The enameled cast iron (if applies) should be
free of chips or cracks. If visible or concealed damage is found or suspected, contact your
dealer for instructions.
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 ( if applies). Lift the stove off
the pallet and set it into place. For information regarding hearth requirements and
minimum clearances, refer to Hearth Requirements and Clearances to Combustibles
sections.
INSTALLATION AND CONNECTIONS
The Sterling is a sophisticated vented gas fireplace heater. 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 may result in an carbon monoxide poisoning, explosion, fire,
damage or loss of life. Do not attempt to complete any part of the installation of this unit unlesstechnically qualified
to do so.
NOTE
Special gas line location are required to accommodate optional blower fan. Please consult your authorized
HearthStone Dealer.
When installing the Sterling gas heater the following items must be considered for a safe and practical installation:
Hearth Requirements/Floor Protection
Clearances to Combustibles
Electrical Connections (Thermostat)
Venting/Chimney Requirements
Gas Supply
Log Placement Within Unit
Hearth Requirements
The floor protection must meet one of the following
criteria.
1. A non-combustible hearth pad with an R-value of 1.1 and a minimum measurement of 30"W x 16"D. The hearth
pad must extend 16" in front of the stove (measured from the glass).
NOTE
If the platform is made of combustible material, it cannot extend further than the ash lip unless it is protected as in
#1 above. Do not install on vinyl tile or carpeting.
2. Installed on a platform equal to or greater than 7" in height, no floor protection is required.
3. 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.
REARLOG
FRONTLOG
EMBERS
EMBERSCREEN
Floor
7" (178mm) Minimum
Sterling BV Hearth Requirements
16"
Floor
criteria 1
(from glass)
Non-combustible
hearth pad
(30"W x 32"D)
Sterling BV Hearth Requirements
(762mmWx 813mmD) Platform
criteria 2

HearthStone Quality Home Heating Products MODEL Sterling “G” B-Vent
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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 air openings
into the combustion chamber and
allow for adequate 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.
Minimum clearances to
combustibles must be maintained as
shown in Figures 1-4. 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.
Vertical Exit Installations Using Single Wall Stovepipe:
Parallel Setting -6" (152-mm) rear wall-to-stovepipe (Figure 1); 4" side wall-to-stove
Corner Setting -3" (75-mm) rear wall-to-stove (Figure 2)
Vertical Exit Installation Using Type B-1 Vent:
Parallel Setting -2" (51-mm) rear wall-to-stove (Figure 1); 4" side wall-to-stove
Corner Setting -3" (75-mm) rear wall-to-stove (Figure 2)
Horizontal Exit Installations:
Parallel Setting -2" (51-mm) rear wall-to-stove; 4" side wall-to-stove (Figure 3)
Corner Setting -3" (75-mm) rear wall-to-stove (Figure 2)
Stove Top Clearance: 14" (356-mm) (Figure 4)
STOVEPIPE CLEARANCES MUST BE MAINTAINED AS FOLLOWS:
Stovepipe Clearances:
Single Wall = 6" (152-mm); Type B-1 Vent = 1" (25-mm) (Figure 4)
14" (355mm)
3" (76mm)
3" (76mm)
Figure 2: Horizontal & Vertical Exit Installations
Corner Setting Grade
Floor
Figure 4: Stove Top & Stove Pipe Clearances
Sterling BV Minimum Clearance to Combustibles
Figure 3: Horizontal Exit Installations
4" (102mm)
Parallel Setting
2" (51mm)
B=6" (152mm) Single Wall Stove Pipe
B=1" (25mm) Type B-1 Vent B
B=2" (51mm) Type B-1 Vent
A=6" (152mm) Single Wall Stove Pipe
Parallel & Corner Setting
Figure 1: Vertical Exit Installations
Floor
A
B

HearthStone Quality Home Heating Products MODEL Sterling “G” B-Vent
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Electrical Connections
Thermostat
The Sterling may use 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 milli-volt 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 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.
Venting /Chimney Requirements
Normally Aspirated Chimneys
The Sterling is a high efficiency gas heater. With operating efficiencies as high as 80%, 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 Sterling 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

HearthStone Quality Home Heating Products MODEL Sterling “G” B-Vent
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Sterling 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 at the first wall or ceiling penetration, and
continue with type B-1 vent from thereon. The minimum clearance from type B-1 vent to combustibles is 1" (25-mm).
Connect the single wall vent pipe or the B-1 vent 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 Sterling 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 venting can not be connected to a flue
serving a solid fuel appliance. It can however, be connected to a flue serving another gas or oil appliance, so long that
it is in compliance 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 the manufacturer's installation instructions and 3) adequately chased (enclosed) and insulated (per
Venting Tables, Category I -Central Furnaces, AGA and GAMA. July 1991; Standards for Gas Vents, National
Standards of Canada; and CAN/CGA-B149.1-M91). Exterior B-1 venting not chased and insulated below the roof line
may experience continuous condensation depending on the locality. 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 Type 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 result in a reduced or unacceptable draft.
Draft Hood/Down Draft Sensor/Spill Switch
The Sterling has a draft hood as part of its rear assembly. The draft hood must not be altered or obstructed. The
Sterling must be installed so that the draft hood is in the same atmospheric pressure zone as the combustible air inlet
for the unit. The Sterling 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 Sterling fail to establish or lose its 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 extend B-1 vent pipe to above the existing roof line, the
Sterling 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 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 Sterling then 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 Sterling 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 installation instructions.

HearthStone Quality Home Heating Products MODEL Sterling “G” B-Vent
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Gas Supply
FACTORY-READY FOR GAS OPERATION
All Sterlings are shipped from the manufacturer fully assembled and ready for natural gas or LP (liquid propane)
gas operation with minor adjustment. However, if the Sterling needs to be converted from natural gas to LP or from
LP to natural gas, conversion of the unit must be performed by qualified service personnel using the manufacturer-
supplied optional conversion kit. Follow the conversion instructions supplied with the conversion kit.
"For installations from 2,000-4,500 ft. (610-1370m), the orifice sizes (DMS) for natural and propane gas are 45 and
56 respectively. See data plate for additional information. For high altitude installations, 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. The conversion shall be carried out by a manufacturer’s authorized representative in accordance
with the requirements of the manufacturer, provincial or territorial authorities having jurisdiction and in
accordance with the requirement of the CAN/CGA 2.17 Installation Codes.
Gas Connection
The gas supply line connection is made to the Sterling's gas control valve just inside the right rear leg of the unit
using a d" male NPT fitting . The supply line should be ½" diameter or appropriately sized to provide a sufficient gas
supply to meet the maximum demand of the unit without undue loss of pressure. We recommend a flexible line to
avoid undue mechanical load on the valve and to ease thread alignment.
The unit must be installed and connected in accordance with local codes, or in absence of local codes, with the most
current edition of the National Fuel Gas Code ANSI Z223.1CCAN/CGA B149. The supply line must include a manual
shut-off valve and union so that the unit can be disconnected for servicing. Also, a sediment trap must be installed
upstream of the heater. The sediment trap is installed to prevent moisture and contaminants from passing through the
pipe to the heater controls. A 1/8" N.P.T. plugged tapping is recommended for ease of pressure and gauge connection
tests.

HearthStone Quality Home Heating Products MODEL Sterling “G” B-Vent
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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 (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 the Specifications. The
manifold pressure is tested by connecting the manometer to the manifold
pressure tap on the gas control valve (Figure 7).
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 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 less than ½" psig.
Log Placement Within Unit
CAUTION
Fragile! Handle the logs 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 largest log fits tightly to the rear of the
firebox.
NOTE
There is one “locator” slot in the base of the main log to aid in
correct placement.
When setting the log, place the log over the “locator” and push log
set firmly against rear wall of the firebox. The next piece to install is the middle-
sized piece. Stand this piece directly between the two burner tubes. The small log
will now fit over the post locators provided on the two larger logs. Open the bag of
embers and place in a single file row across the front burner tube, on top of 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 stressonthelog
set and stove parts, reduced
efficiency and, high levels of carbon monoxide.
Log Set Removal
To remove the logs set, follow the Installation of Logs Set instructions in
the reverse order.
Sterling BV Log Set Assembly
SIDE
VIEW
VIEW
FRONT
SLOT
LOCATOR
PEG
PEG
EMBERSCREEN
EMBERS
FRONTLOG
REARLOG
Sterling BV Assembled Log Set
SCREEN
EMBERS
EMBER
SIDE
VIEW
FRONT LOG
MIDDLE LOG
REAR LOG
LOG LOCATOR
FRONT BURNER
TUBE
TUBE
REAR BURNER
AIR SHUTTER
Sterling BV Assembled Log Set
3" MIN.
Cap
Nipple
To Equipment
Inlet TeeFitting
GasSupply
Inlet
Sediment Trap

HearthStone Quality Home Heating Products MODEL Sterling “G” B-Vent
12
Lighting the Unit for the First Time
Once the Sterling has been set in place and connected as described above, the unit is ready to be lit for the first
time. Each Sterling is tested prior to shipment by the manufacturer, so ignition should take place without failure.
However, a number of small adjustments may be necessary to compensate for variations in gas pressure, altitude and
other factors particular to each installation. Lighting the Sterling for the first time and adjustments to the unit should
be performed by qualified service personnel.
WARNING PRIOR TO FIRST LIGHTING OF UNIT
SMOKE AND FUMES WARNING
When lit for the first time the Sterling will emit some smoke and fumes. This is normal"off-gassing" of the paints
and oils used in the assembly and manufacturing of the unit. Open windows to vent the room as 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 Sterling were polished using a water-based polishing system prior to
assembly of the unit. Any residual moisture in the stones must be dried out slowly to avoid damaging the stones. This
is accomplished by adhering to the following break-in procedure.
When lit the first three times, the Sterling should be burned for no more than 10 minutes, 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 Sterling can be burned at will with no time restrictions
on the length of burn.
PILOT LIGHT WARNING
The Sterling has a piezoelectric spark ignitor (the push button located just above the gas control valve behind the
valve access door) which ignites the pilot light by means of a spark at the pilot light assembly. Do not attempt to light
the unit with a match or by any means other than the piezoelectric spark.
INSTRUCTIONS PRIOR TO FIRST LIGHTING OF UNIT
BEFORE LIGHTING, 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 smell gas immediately follow the What To Do If You
Smell Gas Warning on the cover of this manual.
Use only your hand to turn the gas control knob. Never use tools. If the knob will not push in or turn by hand,
don't try to repair it; call a qualified service technician. Any force or attempt to repair may result in fire or explosion.
WARNING
Do not use this appliance if any part has been under water. Immediately call a qualified service technician to
inspect the appliance and to replace any part of the control system and any gas control which has been under water.
As an additional safety precaution prior to lighting the unit for the first time, wait 5 minutes to allow any residual
gas within the unit to dissipate. 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.
Prepare for the lighting procedure by adjusting the thermostat to its lowest setting or "OFF" position. If the gas
control knob is not in the "OFF" position, turn the knob fully clockwise to "OFF". Locate the variable output control
and turn it fully clockwise to the highest setting.

HearthStone Quality Home Heating Products MODEL Sterling “G” B-Vent
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Lighting Instructions
1. STOP! Read the safety information above.
2. Set the thermostat to "OFF" position.
3. Unplug the fan accessory, if so equipped.
4. Push in and turn gas control knob clockwise to "OFF"
5. Wait (5) five minutes to clear out any gas. If you then smell gas, STOP! Smell all around the appliance 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 smell gas immediately follow the What To Do If You Smell Gas Warning on the cover of this manual. If
you do not smell gas, go to the next step.
6. Turn knob on gas control counterclockwise to "PILOT".
7. Push in control knob all the way and hold in. Immediately light the pilot with the gas lighter [push in and
"click" the piezoelectric spark ignitor button]. Continue to hold the control knob in for about 20 seconds after
the pilot is lit. Release knob and it will pop back out. Pilot should remain lit. If the pilot goes out, repeat the
operation.
!If knob does not pop out when released, stop and immediately call your service technician or gas supplier.
!If the pilot will not stay lit after several tries, turn the gas control knob "OFF" and call your service
technician or gas supplier.
8. Shut the gas control valve access door.
9. Turn gas control knob counterclockwise to "ON".
10. Plug in fan accessory, if so equipped. Select “ON” of the on/off/T-stat switch, or if “T-stat” is selected.
11. Set thermostat to desired setting.
To Turn Off Gas To Appliance
1. Set thermostat to OFF position, or select the “OFF” position of the on/off/T-stat switch.
2. Turn off all electric power to the appliance if service is to be performed. Unplug accessory fan (if equipped).
3. If shutting the unit for the non-heating season, turn gas control knob fully clockwise to "OFF". Do not force.
As a supplement to the above instructions: When pressing/clicking the piezoelectric spark ignition button to light
the pilot light, watch through the glass front door of the unit. Click the ignitor button until a flame is visible at the pilot
light and once lit, continue to press on the gas control knob for another 20 seconds, then release. Ascertain that the
pilot light is still lit by looking through the front door. If lit, then turn the gas control knob fully counterclockwise to
the ON position. If the pilot light failed to light or if it went out due to a premature release of the gas control knob
while pressed in the PILOTposition, wait 60 seconds for interlock to release, then repeat the lighting process as
described above.
WARNING
The control has an interlock device. After shutting off all gas flow, the pilot burner cannot be relit until the
thermocouple has cooled, allowing the electromagnet to be released (approx. 60 sec.). The gas control knob is
designed to be operated by hand. Do not use any tools during this operation. Damaged knobs may results in serious
injury.
Once the pilot light has been lit, the main burners are lit moving the thermostat to a high setting so that it "calls" for
heat (i.e. turns the unit on). The main burners should light immediately. Note that the on/off cycling of the main

HearthStone Quality Home Heating Products MODEL Sterling “G” B-Vent
14
burners are controlled by the thermostat but that the pilot light remains lit regardless of the thermostat setting. To turn
the pilot light off, turn the gas control valve fully clockwise to the OFF position.
Once the unit is lit, observe the flame pattern and adjust as necessary per the following instructions while keeping
in mind the off-gassing and break-in warnings listed above.
Initial adjustments
Variable Output Control
The gas control valve is equipped with a variable output
control. This control varies the rate of heat produced by the
unit by varying the gas pressure to the main burner tube.
The length of the burn cycle is affected by a combination of
heat output and the thermostat setting. If your stove cycles
OFF & ON often, try reducing the burn with the gas control
valve first.
Using the variable output control, the heat output of the
unit can be reduced for mild Fall and Spring months or maximized for the colder Winter months. This
adjustment can be made by the homeowner as necessary by turning the variable output control knob to HI or
LO or any setting in between.
Air Shutter Adjustments
The air shutters are preset by the manufacturer for optimum operation and should not need adjustment by the
owner. There are adjustable air shutters located on the main burner tubes on the right rear of the unit behind the right
rear cover. The air shutters are used to regulate the air-to-gas combustion mixture which in turn influences the size
and color of the flames. However, it may need adjustment once the unit has been installed to compensate for
variations in supply line pressure, altitude and other variables.
To determine if the air shutters need adjustment, it is necessary to view the flame pattern with the variable output
control knob at its highest setting. Allow the unit to operate for 10
minutes to allow the entire unit to reach temperature and for the
flame pattern to stabilize.
There are two simple guidelines to aid in determining the
correct flame pattern: 1) If the flame at the base of the logs is
completely blue, the air shutters may be open too far; 2) If the
flame is dirty or licks the top of the stove, the air shutters may be
closed too far.
To adjust the air shutter openings, simply loosen the screw on
the shutter, clamp and pull the adjustment rod to close the air
opening, or push the adjustment rod to open the air opening.
Closing the air shutters allow less oxygen to burn and results in a
higher, yellow flame. Opening the shutters allow more oxygen to
burn and results in a lower, blue flame. Adjustment may be done
while viewing the fire. Once the desired flame pattern is achieved,
tighten the screw.
WHEN TIGHTENING THE SHUTTER CLAMP SCREW, DO NOT OVER-TIGHTEN. TIGHTEN UNTIL
THE SCREW-HEAD TOUCHES METAL, AND THEN ANOTHER 1/4 TURN.
Supply line and manifold gas pressure adjustments must be performed by qualified service personnel.Do not
attempt to complete any part of the installation or adjustment of this unit unless technically qualified to do so.
When adjusting the air shutters for flame color take care not to obtain a flame which is too yellow (shutters closed;
too little oxygen). While such a flame may be aesthetically pleasing, it is the result of incomplete combustion which
will eventually result in an accumulation of carbon in the firebox, on the logs, burner tubes and window glass.
LOCATED BEHIND REAR PANEL
SterlingBV
RearView
SHUTTER ADJUSTMENT RODS
SETTING
LP
SETTING
NG
SHUTTER CLAMP
NG
SETTING
LP
SETTING
FRONT BURNER TUBE
SHUTTER ADJUSTMENT ROD
SHUTTER CLAMP SCREW
REAR BURNER TUBE
SHUTTER ADJUSTMENT ROD
Sterling BV Air
Shutter Adjustment
FIREBOX
FORCLARITY
GAS LINES NOT SHOWN
SLIDE
SLIDE
Sterling BV Flame Pattern

HearthStone Quality Home Heating Products MODEL Sterling “G” B-Vent
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IGNITOR PILOT HOOD
LOW MASS
THERMOCOUPLE
THERMOPILE
FRONT BURNER TUBE
PILOT FLAMES
REAR BURNER TUBE
Pilot Adjustments
The pilot light is preset by the manufacturer and should not need adjustment. The pilot light flame should be large
enough to engulf the thermopile and thermocouple located just next to the pilot light, but not so large as to create
excessive noise or consume excessive gas. However, it can be adjusted by means of the pilot light adjustment screw
located on the gas control valve. Remove the front lower facade to access.
Note too that the pilot light flame must properly engulf the thermopile so that the thermopile can generate sufficient
milli-voltage (750mv) to power the millivolt gas control valve. Control of the Sterling by the wall-mounted thermostat
may become erratic or non-existent if the pilot light flame is too small or misdirected away from the thermopile, or the
unit may go out.
DAILY OPERATION
The Sterling gas-fired heater is easily operated by the homeowner once installed and adjusted by qualified service
personnel. If the “T-stat” position of the on/off/T-stat switch is selected, 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 elsewhere in this manual.
When the unit first lights, 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.
Keep the area around the Sterling clear of combustible materials, gasoline and other flammable vapors and liquids.
Do not allow the placement of items near the unit that will obstruct air flow or be ignited due to the heat from the
surfaces of the stove.
ROUTINE MAINTENANCE AND
CARE
The Sterling requires minimal routine
maintenance and care. The unit should always
be cool and off when being cleaned or
maintained.
The unit should receive regular cleaning on,
under and around the stove to prevent the build
up of dust and lint. The exterior surfaces of the
unit can be cleaned using soap and water and a
soft cloth. Do not use abrasive or chemical
cleaners and take care not to scratch the stones,
glass or enamel finish (if so equipped) when
cleaning the unit. The use of chemical or wax-
based cleansers or polishes is not recommended
due to the potential for discoloration of the
stones when the residue of the cleansers or
polishes is exposed to heat.
The firebox should receive periodic cleaning
to prevent the accumulation of dust, lint and

HearthStone Quality Home Heating Products MODEL Sterling “G” B-Vent
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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 entire firebox, the burner tubes and carefully vacuum the
entire surface of the log set. Take care to thoroughly vacuum the ports (holes) along the top of the burner tubes.
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 elsewhere in this manual. Check to ensure that a flame is burning from
each burner port. The pilot light flame should be large enough to engulf the sensor/thermocouple as described
elsewhere in this manual (Initial Adjustments: Pilot Adjustment). Turn the unit off by setting the thermostat to off,
turning off the gas at the gas control valve. Allow the unit to cool.
Check and clean any burner ports which are not burning or burning properly. Clean burner ports using a soft brush
or vacuum cleaner. If the pilot light flame height needs adjustment it should be adjusted by qualified service personnel
as described elsewhere in this manual.
Complete the cleaning procedure by carefully replacing the log set within the firebox as described elsewhere in this
manual. Close and fasten the front door. Turn on the gas, light the unit and check for proper operation.
Regularly check that the area around the Sterling is kept free and clear from combustible materials, gasoline and
other flammable vapors and liquids. Check that the flow of combustion and ventilation air is not obstructed.
Note
If any replacement parts are needed,
contact your local dealer for parts.
Do not substitute materials.
Once a year the unit and venting
system should be inspected by
qualified service personnel to ensure
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.
OPTIONAL BLOWER FAN
An optional blower fan (Item
#95-57010) is available from the
dealer or manufacturer to boost heat
output efficiency and improve air
circulation within the room. It will
come with complete installation
instructions. The blower fan, which
is powered by standard 110/115
volt, 60 cycle, 1.6 amp household
current, is easily placed beneath the
lower rear casting of the unit. The
blower fan has a thermo-switch.
When the stove heats up, the blower
fan turns on. The blower fan will
continue to operate for a period of
time after the unit shuts off as it
takes some time for the stove to cool
down.
Gas Requirements For
Blower
The gas supply line connection is
made to the Sterling’s gas control
valve using ad" male NPT fitting.

HearthStone Quality Home Heating Products MODEL Sterling “G” B-Vent
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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. Check local codes.
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 Z223.1CCAN/CGA B149 Vented Gas Fireplaces Heaters,
and CAN/CGA 2.17. 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 build in pressure taps for test gauge connections.
TROUBLE SHOOTING
Symptom
1. Pilot will not light.
2. Pilot will not stay lit
after carefully following
lighting instruction.
3. Pilot burning, no gas
to main burner, valve
knob in the “ON”
position, on/off/T-stat
switch in “ON”
position, or if “T-stat” is
selected, T-stat in “ON”
position.
4. Pilot and burner
come on, but go out after
some warm-up.
5. Frequent pilot outage
problem.
Possible Cause
A. Insufficient gas pressure, or
air in the pilot line.
B. Pilot orifice plugged.
C. Defective or misaligned
electrode at pilot.
D. Defective ignitor.
A. Low or too high gas pressure .
B. Defective thermo-couple.
A. If T-stat is selected, or T-stat
or wires defective.
B. Thermopile may not be
generating sufficient voltage.
C. Plugged burner orifice.
A. Inconsistent, or insufficient
flame on Thermopile.
B. Insufficient gas pressure.
A. Pilot may be too low or
blowing, (high), causing the pilot
safety to drop out.
Corrective Action
A. Using the piezosparker, try to light the pilot. If it will not light,
check the inlet gas pressure.
B. Clean or replace pilot orifice.
C. If a match lights the pilot, check the electrode gap and location.
Should be a 3-mm gap in the flame area.
D. Check for a good connection between ignitor and electrode.
Check wire insulation. If properly connected and no spark, replace
ignitor.
A. Check for proper inlet pressure for the gas being used.
B1. Check pilot flame to see that it is impinging on the top 9.5-mm
of the thermocouple. Clean and/or adjust pilot for maximum flame
impingement.
B2. Ensure that the thermocouple connection at the gas valve is
tight, and thermocouple is fully inserted into the pilot bracket and is
tight. (Hand tight, plus ¼" turn.).
B3. Check thermocouple output using milli-volt meter. Insert
adapter in between valve and thermocouple. If the reading is less
than 14-mV, replace thermocouple.
A. Check T-stat/wires for proper connections. Place Jumper wire
across terminals at T-stat. If burner comes on,replace defective
wall switch. If OK, place jumper across T-stat wires at gas valve.
If burner comes on, tighten connections, or replace faulty wires.
B. Check Thermopile output, using a milli-volt meter. Take the
readings across generator terminals of the gas valve. (TH and TP).
Millivolt reading should be greater than 150-m V. If not, replace
Thermopile. If the meter reading is OK, but the burner does not
come on, replace the gas valve.
C. Remove and check burner orifice, clean or replace. Note: donot
use any metal cleaning device, as this may damage the orifice.
A. Adjust flame size and assure that the flame is aimed
directly at the Thermopile.
B. Check line pressure to ensure that the correct inlet pressure is
present for the type of gas being used. If propane pressure is
inconsistent, check for water condensation at the regulator.
A. Clean and/or check the pilot flame for correct impingement on
the thermogenerator and thermocouple.

HearthStone Quality Home Heating Products MODEL Sterling “G” B-Vent
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PARTS LIST
1546-462 Top Stone 1546-462A Side Stone
1546-463 Front Side Stone 1546-464 Front Bottom Stone
2510-219RS Door 2510-303 Bottom Leg
2510-401 Top 2510-403F Front Grill
2510-411 RF Door Frame 2510-413 Side Leg
5500-2402 Ember Screen 7211-502 Rear Log
7200-120 Burner Orifice: Size 55 7211-503 Middle Log
7200-129 Burner Orifice: Size 44 7211-504 Front Log
7211-505 Bag of Embers 7211-212 Front Burner Tube (Lower)
7211-310 Gas Valve Sit (NG) 7211-202 Rear Burner Tube (Upper)
7211-372 Pilot Burner Assy (NG) 7211-026 Spillage Switch
94-58405 Glass Kit 95-56211 LP Fuel Conversion Kit
7211-430 Piezo ceramic and wire 95-56210 NG Fuel Conversion Kit
7210-103 Piezo push button igniter 7211-470 Thermocouple
7210-090 Thermopile 7211-391 4 way pilot hood and clip
7211-009 Pilot gas tube 7211-136 .35 Pilot orifice (LP)
7211-163 .62 Pilot Orifice (NG)
SPECIFICATIONS
Fuel requirements NATURAL GAS Liquid Propane (LP)
Input Rating 40,000 40,000
Maximum Output (Btu/hr) 0-610 m 31,200 30,200
Minimum Input (Btu/hr) 0-610 m 21,200 22,000
Orifice Size (DMS) 0-610 m 44/44 55/55
Input Rating (Btu/hr) 610-1370 m 37,000 37,500
Orifice Size (DMS) 610-1370 m 45/45 56/56
Manifold Pressure (in. w.c./kpa) 3.5/.87 10/2.49
Manifold Pressure, Lo Setting (in. w.c./kpa) 1.2/0.3 3.3/0.8
Minimum Inlet Pressure (in. w.c./kpa) 5/1.24 11/2.74
Fuel supply line size ½"
Flue exit 4" diameter, top or rear exit (reversible)
Chimney requirement Type B-1 vent, 4" diameter
Ignition Standing pilot light
Certification Tested to: ANSI Z 21.88-1998CCSA 2.33-M98 Vented Gas Fireplace Heaters, and CAN / CGA
2.17(high altitude). Approved for use in the state of Massachusetts by, The Commonwealth of
Massachusetts Board of State Examiners of Plumbers and Gas Fitters.
Installation Install in accordance with local codes, if
any; if not, follow current edition ANSI
Z223.1 (U.S. installations) or current
CAN1-B149 installation code (Canadian
installations)
Shipping weight 260 lbs
Actual weight 230 lbs
Warranty 3 year limitedwarranty, excluding
door glass, gasket and enamel finish
Refer to Appendix A -Safety Label for Canadian
ratings and orifice sizes for high altitude installations.
24"
607mm
Front View
Sterling BV
6"
153mm
27"
686mm
27"
686mm
27"
686mm
HEARTHSTONE
Sterling BV
Side View
211/2"
546mm
13"
330mm
DIMENSIONS:

HearthStone Quality Home Heating Products MODEL Sterling “G” B-Vent
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9
SAFETY LABEL