Sterling-Ht(Model 8532)

GAS-FIRED DIRECT VENT HEATER
Owner’s Manual& Installation Guide
Operate and Maintain This Gas Heater
According To This Instruction Manual
Read This Manual in Its Entirety

WARNING: If the information in these instructions
is not followed exactly, a fire, or explosion may
result causing property damage, personal injury, orloss of life.


Do not store, or use gasoline, or otherflammable vapors and liquids near this or any
other gas appliance!

AVERTISSEMENT: Assurez-vous de bien suivre les
instructions donné dans cette notice pour réduireau minimum le risque d’incendie ou pour éviter tout
dommage matéeriel, toute blessure ou la mort.
Ne pas entresposer ni utiliser d’essence ni d’autre
vaperurs ou liquides inflammables dans levoisinage de cet apprareil ou de tout autre appareil!

WHAT TO DO IF YOU SMELL GAS:
Do not try to light any appliance.
Do not touch electrical switches; do not use thephone in your building.
 Immediately call your gas supplier from aneighbor’s phone. Follow your gas supplier’s
instructions.
 If you cannot reach your gas supplier, call the fire
department.

QUE FAIRE SI VOUS SENTEZ UNE ODEURDE GAZ: Ne pas tenter d’allumer d’appareil.
 Ne touchez à aucun interrupteur. Ne pas vous
servir des téléphones se trouvant dans lebatiment où vous vous trouvez.
 Appelez immédiatement votre fournisseur degaz depuis un voisin. Suivez les instructions
du fournisseur.
 Si vous ne pouvez rejoindre le fournisseur deA qualified installer, service agency, or gas suppliergaz, appelez le service dos incendies.
must perform installation and service.
In theCommonwealth of Massachusetts, all installation of L’installation et service doit être exécuté par un
gas lines and gas fitting shall only be done by a qualifié installer, agence de service ou lelicensed gas fitter or licensed plumber.
fournisseur de gaz.
Sterling Ht Model 8532
Manual: 6400-40428
Revised: 5/31/11

Hearthstone Quality Home Heating Products, Inc

STERLING-Ht Model 8532

INFORMATION SHEETUse this pag e to record al l relevant information con cerning the purchase, installation, and maintenance of your
STERLING Ht Model 8532 Gas-Fired Direct Vent Heater. This information will facilitate servicing, purchase o freplacement parts, and warranty claims (if nece ssary). Keep your original re ceipt in a saf e place as proof ofpurchase.

Serial Number:
Fuel type (check one)Natural Gas

Liquid Propane

Sold by:Phone:

Date of Purchase:

Installed by:Date of Installation:

Phone:
Gas Supplier:
Phone:

Read this Owner’s Manual before installing, or operating the STERLING heater. Retain this manual for futurereference.

SERVICE RECORD
Date

Who Performed WorkWHAT
Firebox cleaning.............
Glass cleaning................
Door Gasket....................

Work PerformedWHEN
annually
as needed
Replacement as needed1

Notes:Hearthstone Quality Home Heating Products, Inc

STERLING-Ht Model 8532

WELCOMETABLE OF CONTENTS

Congratulations on your purchase of Hearthstone’s
Sterling Ht Gas-Fired Direct Vent heater. The
Sterling incorporates the latest in balanced vent gas
technology, which will provide you with clean,efficient heat for years to com e. Combustion air
comes directly from the outside of you r home to thesealed firebox system, eliminating the potential forannoying back drafts or other problems associatedwith home depressurization. The com bination ofnatural stones with cast iron gives the Sterlingapleasing look, which can be
maintained withminimum care.

WELCOME .................................................. 2

The Sterling will provide you with years of practicaland convenient service. However, as with an y gas
appliance, the unit must be properly and safely
installed and maintained byqualified service
personnel to ensure safe and trouble-free operation.

GAS CONNECTIONS .................................. 16

OWNER’S INFORMATION ............................ 4
LIGHTING INSTRUCTIONS .................................4DAILY OPERATIONS .........................................4
INSTALLER’S INFORMATION ...................... 5
UNPACKING AND INSPECTION ..........................5
STOVE DIMENSIONS & CLEARANCES TOCOMBUSTIBLES ................................................6
VENTING INFORMATION ...................................9
ATTACHING YOUR VENTING ..........................15
LOG PLACEMENT ...........................................17
INSTALLATION OF THE LOG SET .....................17
REMOVAL OF THE LOG SET ............................18
LIGHTING THE UNIT THE FIRST TIME ..... 19

READ THIS OWNER’S MANUAL
Operate and maintain this gas heater according to the
instructions in this m anual. Read this manual in its
entirety.

ODORS AND IMPURITIES .................................19
PREPARE FOR LIGHTING .................................19
INITIAL ADJUSTMENTS ...................................19
LIGHTING INSTRUCTIONS ...............................19
TURNING OFF THE UNIT .................................20

THIS HEATER MUST BE INSTALLED AND
MAINTAINED BY QUALIFIED SERVICE PERSONNEL
Verify the gas connections, and venting systems withrequirements of local,
regional, or natio nal
installation codes. Qualified service personnel must
inspect the gas heater before use, and at least
annually.

PILOT AND BURNER FLAMES ......... 20
VARIABLE OUTPUT CONTROL ........................20
GAS CONVERSIONS ................................... 21
ROUTINE MAINTENANCE AND CARE ....... 22

ALWAYS VENT TO THE OUTSIDE
Never vent the gas heater to other rooms, orbuildings. Do not con nect this gas appliance to achimney flue serving a s eparate solid-fuel burni ng
appliance.

PARTS LISTS ............................................. 24
TROUBLESHOOTING GUIDE ..................26

MANUFACTURED BY:

Hearthstone Quality Home Heating Products, Inc.
317 Stafford Avenue
Morrisville, Vermont 05661-8695
USAE-mail: inquiry@Hearthstonestoves.com
Web: www.Hearthstonestoves.com

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STERLING-Ht Model 8532

SERVICE CAUTION
Any shield, door, or other component removed forservicing must be replaced prior to o perating. Any
components of the stove rem oved for servicing m ust
be replaced prior to operating. If you believe y ourSterling is not perform ing properly, immediately
discontinue operation until the unit has beeninspected and approve d by qualified service
personnel. Prior to servicing the unit, turn the valve
control knob clockwise to “OFF”. Ensure the unit iscool before servicing and cleaning.
Any safety
screen, guard, or component removed duringservicing must be r eplaced before operation. Do
not use any components other than those approved
by Hearthstone Quality Home Heating Products,
Inc., otherwise all warranties are void. Do notsubstitute components!

WARNING: do not operate the appliancewith the fr ont glass removed, cracked, or
broken. Replacement of glass sh ould bedone by a licensed or qualified service
person. Only open front fo
r routineservice. Do not slam, or strike the glass.
WARNING: A qualified service t
echnicianshould do installation, and repair. A qualified
service technician must inspect the appliance
before use, and at least annuall y. More frequentcleaning may be required due to excessive lint
from carpeting, bedding material, pets, etc. It isimperative that the c ontrol compartments,
burners, and circulating air passag es of theappliance are kept clean and free of obstructions.
(S’assurer que le brûleur et le compartiment descommandes sont propres. Voir les instructions
d’installation et d’utilisation qui accompagnent
l’appareil.)

FIRE HAZARD
Do not store or use gasoline, or other flammablevapors or liquids near this appliance. The Sterling
should be l ocated out of traffic, and awayfromfurniture, draperies, clothing, an d other flammablematerials.
SHOCK HAZARD (IF EQUIPPED WITH ACCESSORY FAN) The
accessory blower is equipped with a three-prong(grounding) plug for protection against shock hazard
and must be plugged directly into a properly
grounded three-prong receptacle. Do not cut or
remove the grounding prong from the plug.
HOT SURFACES
Certain exposed surfaces of the Sterling will reachhigh temperatures during n ormal operation.
Clearances to combustibles must be maintained, as
specified in the “Clearances To Co
mbustibles”
section of this manual. Due to high tem peratures,the appliance should be located out of traffic an daway from furniture, draperies, clothing, andother flammable materi als. Children and adults
should be al erted to the hazards of high surface
temperatures and m ust stay away to avoid burns
to skin or possible cloth ing ignition. Ensure tha t
young children ar e carefully supervised when in
the same room as the appliance. Clothing or otherflammable material must not be placed on or near
the appliance. (Surveille les enfants. Garder lesvêtements, les meubles, l’essence ou autres liquides à
vapeur inflammables lin de l’appareil.) Clean thearea around, under, and b ehind the unit on a regularbasis to prevent the accumulation of dust and lint.

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STERLING-Ht Model 8532

OWNER’S INFORMATION

If knob does not pop out when released, stopand immediately call a qualified service
technician or gas supplier.
If the pilot will not stay lit after several tries,
turn the gas control knob “OFF” and call aqualified service technician or gas supplier.
7. Turn gas control knob counterclockwise to“ON”.
8. Select “ON” or “T-STAT” position on theon/off/t-stat switch.
9. Plug in the blower accessory, if so equipped.
10. Set thermostat to “ON” and set the desired
temperature setting.

The installation must conform with local codes or, i nthe absences of local codes, the current National Fuel
Gas Code, ANSI Z223.1 ( NFPA 54), or CAN/CGA
B149 Installation Code. (Installer l’appareil selon lescodes ou règlements locaux, ou, en l’absence de telsrèglements, selon les Codes d’installation CAN/CGAB149.)
Warning: Do not use this appliance if any part has
been under water. Immediately call a qualified
service technician to inspect the heater, and to
replace any part of the control system that has
been under water. (Ne pas se servir de cet appareils’il a été plongé dans l’eau, complètement ou en
partie. Appeler un technicien qualifié pour inspectorl’appareil et remplacer toute partie du système decontrôle et toute commande qui ont été plongés dansl’lau.)

Normally, if the “T-STAT” position was selected, themain burner is cycled on and off by the Thermostat
or the “on”, “off” switch located on the bottom of the
Thermostat body.
TO TURN OFF THE GAS TO THE APPLIANCE
Turn the ga s control k nob clockwise to “OFF”
position. If s hutting the unit off for the non-heating
season, this will improve the overall efficiency of theunit as the heat from the p ilot is wasted in thesummer. W hen putting the unit back into service
follow the lighting instructions described on thispage.

Certified for use by:
Board of State Examiners of Plumbers and Gasfitters
100 Cambridge Street, Room 1511
Boston, Massachusetts
02202

LIGHTING INSTRUCTIONS

The gas control knob is located on the top of thestove, in the rear, right-hand corner.

VARIABLE OUTPUT CONTROLThe gas con trol valve is equipped with a variable
output control. This contr ol varies the rate of heatproduced by the unit by vary ing the ga s pressure to
the ember burner.

1. Set the on/off/T-stat switch or thermostat to theoff position.
2. Unplug the blower accessory, if so equipped
3. Push in and turn gas control knob clockwise to“OFF”. (If not previously lit, the knob should bein this position.)
4. Wait (5) five minutes to clear out any gas. If you
then smell gas, STOP! Smell all around theappliance area for gas. Be sure to smell next to
the floor because some gases (LPG) 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.
5. Turn gas control knob counterclockwise to“PILOT”.
6. Push in control knob all the way and hold in.
(You should hear the clicking of the igniter in thefirebox) Verify ignition of the pilot. Continue tohold the control knob in for about 20 seconds
after the pilot is lit. Release the knob and it will
pop back out. Pilot should remain lit. If the pilot
goes out, repeat the operation.

DAILY OPERATIONSThe homeowner can e asily operate the Sterling gasfired heater. The unit comes wit
h a standard
thermostat. Remote thermostats, or wall switches areavailable for purchase fr om your local Hearthstone
dealer. Once the therm ostat is installed and properly
adjusted, the desired room temperature is maintained.
By adjusting the variable output contr ol located on
the gas control valve, the rate of heat output can b evaried to meet the heating requirements of the season.
Choosing a low flame setting will result in longer
burn cycles at a reduced output, whil e choosing ahigh flame setting will result in a short er, hotter burncycle. Thr ough trial an d error, the h omeowner canselect the optim um flame size for thei r setting andapplication. Also available is a variable speed blower.
(Kit# 95-57320)

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STERLING-Ht Model 8532

INSTALLER’S INFORMATION

installing the unit. If any damage, or a missing part, isdetected, immediately contact y our dealer. Do notinstall or put into service a damaged or incomplete
heater.

Codes
Adhere to ALL local codes or, in their absence, thelatest edition of THE NATIONAL FUEL GASCODE ANSI Z223.1 (NFPA 54) or CAN/CGA B1 49
Installation Code, which can be obtained from:The unit should appear to be square and level. The
sheet metal parts should be smooth and free of bend s
or dents. The ena meled cast iron should be free ofchips or cracks. If visible or concealed damage isfound, contact your dealer.

AMERICAN NATIONAL STANDARDSINSTITUTE, INC.
1430 BROADWAYNEW YORK, NY 10018
OR
NATIONAL FIRE PROTECTIONASSOCIATION, INC.
BATTERY MARCH PARKQUINCY, MA 02269

The decorative fiber logs supplied with the Sterlingare located in the firebox. Alway s use great car ewhen handling the decorative fiber logs, as they arevery fragile and subject to damage and breakage. To
open the front, grasp both sides of the front castfacade, toward the bottom , and lift upward and thenoutward. The bottom will slide up an d out. The
whole piece is then easil y removed. Set the front
aside taking care not to chip or scratch the enamel .
Next, locate the two rotating clips above the glass.
Rotate the clips out of the “locked” position and tilt
the top of the glass outward. Lift the e ntire glass up
and out. The log set can now beinspected fordamage. To take the unit off the pallet, rem ove thelag bolts, which fasten th e unit to the pallet. Tak ecare not to chip the enameled legs. H ave someone
help lift the stove off the pallet, and set it into place.

The appliance, when inst alled, must be el ectricallyconnected and grounded in accordance with local
codes or, in the absenc e of local co des, with thecurrent NFPA 70-National Electrical Code or CSA
C22.1-Canadian Electric Code.
A manufactured home (mobile) OEM installationmust conform with the Manufactured HomeConstruction and Safety Standard, Title 24 CFR, Part
3280 (U.S.) or Standard for Manufactured Ho me
Installation, ANSI/NCBCS A225.1 or Standard for
Gas Equipped Recreational Vehicles andmobileHousing, CSA Z240.4 .CAN/SCA Z240 M H(Canada).
(Installer l’appareil selon les codes ou
règlements locaux, ou, en l’absence de telsrèglements, selon les Codes d’installation CAN/CGAB149.)

Packing List

1-Sterling Gas-fired Heater containing:
3-Decorative Fiber Logs
1- Bag Platinum Bright Embers
1-AA Battery
1-Owner’s Manual and Warranty Card
1-Thermastat and wire
1-LP Conversion kit

FIBER LOG SAFETY INFORMATION
If the decorative fiber logs supplied with the Sterlingare damaged, they must be replaced. The
manufacturer, through your local Hearthstone dealer,
supplies replacement parts. Do not replace fiber logs
with any materials not approved by Hearthstone
Quality Home Heating Products, Inc.
UNPACKING AND INSPECTION
Unpack and Inspect for Damage
The Sterling is packaged by the m anufacturer towithstand normal shipment without dam
age.
However, damage can still occur during transit, sotake care to inspect for damage when unpacking and5

Hearthstone Quality Home Heating Products, Inc

STERLING-Ht Model 8532

WARNING! Do not oper ate the stove withthe glass front remov ed, cracked, or
broken.

ITEMS REQUIRED FOR INSTALLATION* External regulator (for propane/L.P.G. only)* Piping which complies with all codes* Pipe sealant approved for use with propane/L.P.G.
(resistant to sulfur compounds)* Manual shutoff valve* Sediment trap (page 16)* Tee joint* Pipe wrench* Phillips head screwdriver* Other parts as required by local code
*Safety Glasses*Gloves*Stone Set
AIR SUPPLYThe Sterling Direct-vent does not requi re additional
installer provided ventilation.

Sterling Dimensions
If this appliance is to be installed on carpeting, vinyl
tile or combustible material other than wood flooring,
it must be installed on a metal or wood panel extending
the full width and depth of the stove.

STOVE DIMENSIONS & CLEARANCES TOCOMBUSTIBLES

Always maintain clearances around the stove, as
shown in the Clearan ces to Com bustibles figures.
This allows for adequate ventilation.

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STERLING-Ht Model 8532

18" (458mm)

2" (51mm)

2" (51mm)
4" (102mm)
Parallel Installations
1" (26mm)

14" (355mm)
3" (76mm)

3" (76mm)

2" (51mm)

Floor
Mantel Installations

Corner Installations

CLEARANCE TO COMBUSTIBLESSPECIFICATIONS:LISTED: DIRECT VENT GAS HEATER
Model: 8532-Sterling Ht DV
Testing Agency: Intertek Testing Services NA, Inc. (ITS)
Tested to: ANSI Z21.88-1998CSA 2.33-M98 CAN/CGA 2.17
* You may keep your orifices the same if you wish to burn at the lower 33,000 btus with the top exit kit.
Venting Exit TypeGas Type
Input rating (Btu/hr) 0-2000ft
Maximum output (Btu/hr) 0-2000ft
Minimum input rating (Btu/hr)
Orifice size DMS 0-2000ft
Man. pressure- HI setting (in.w.c./kPa)
Man. pressure- LO setting (in.w.c./kPa)
Minimum inlet pressure (in.w.c./kPa.)
Maximum inlet pressure (in.w.c.)

Rear Exit – 5”x8” PipeNGLP
33,00033,00026,60027,40013,60011,90043,52
55,63
3.5/0.87
10.0/2.48
1.2/0.3
3.3/0.8
5.0/1.24
11.0/2.88
7.0
137*Top Exit – 4”x6” PipeNG
LP
38,00038,00030,20031,30013,90011,60038,51
53,63
3.5/0.87
10.0/2.48
1.2/0.3
3.3/0.8
5.0/1.24
11.0/2.88
7
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STERLING-Ht Model 8532

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STERLING-Ht Model 8532

VENTING INFORMATION

Vertical Vent Cap
Snorkel 36”
Vinyl Siding Standoff 4 x 6 5/8”
Round Ceiling Support Wall
Thimble Covers
Wall thimble

The Sterling is approved for installation onlywith the following venting manuafcturers
products.







Simpson Dura-vent Direct Vent GS
AmeriVent Direct
Secure Vent systems
Selkirk Direct-Temp™
EXCELDirect

If the vent air intake s ystem, for any reason, isdisassembled, it m ust be reinstalled per the
instructions provided for in the initial installation.

WARNING

This appliance must not be connected to a chimney
flue serving a separate solid-fuel burning appliance.
The Sterling can be vented two ways:
A) Straight out the back exit, using 5”x8” pipe.

Allowable Venting Configuration GraphsB) Top exit, using kit #95-60320. If you want to
run your vent vertically, you must buy thisvertical vent kit which will convert the venting
pipe to 4"x6". The restrictor will be part of thiskit. No restrictor is needed for a horizontal
exit.

When determining the venting configuration, youmust consider the position of the termination cap.
There are 5 possible categories.

A)
B)
C)
D)

When referring to the rest of this section ensure
which way your unit is being vented.

E)

Note:
If the unit is vented vertically, 4”x6” pipe
must be used.
If using Top Exit Kit, a 24” section of pipe
must be used directly off of stove.

Fireplace & Existing chimney
installation
Horizontal termination for 5”x8” pipe
Horizontal termination for 4”x6” pipe
Vertical termination straight or 2 45O
elbows (4”x6” pipe only)
Vertical termination, 1 or 2 90 O elbows(4”x6” pipe only)

Every venting configuration must fall into one ofthese categories.
The vent/air intake termination clearances above thehigh side of an angled roof as follows:

APPROVED VENTING SYSTEMCOMPONENTS

Component Description
90 0 Elbow
45 0 Elbow
6" Straight9" Straight12" Straight24" Straight36" Straight48" Straight
11"-14 5/8" Adjustable Pipe Length
Horizontal Vent Cap

Roof Pitch
Horizontal
Overhang

Vertical Wall

Flat to 6/12
7/12 to 9/12
10/12 to 12/12
13/12 to 16/12
17/12 to 21/12

Feet
1
2
4
6
8

Meters
0.3
0.6
1.2
1.8
2.4

The termination cap must not
be recessed into a wall or
ceiling.

Termination
Cap

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Termination Clearances

Hearthstone Quality Home Heating Products, Inc

STERLING-Ht Model 8532

A. Fireplace & Existing Chimney Installation
The use of an existing chimney as an air intake is not covered under the ANSI 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.

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Hearthstone Quality Home Heating Products, Inc

B.

STERLING-Ht Model 8532

Horizontal Terminations for 5"x 8" Pipe.

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Hearthstone Quality Home Heating Products, IncC.

STERLING-Ht Model 8532

Horizontal Terminations for 4"x 6" Pipe (Requires the use of Top Exit Kit, # 95-60320)

Note: All top exit configurations require a minimum of a 24” section of pipe directly off the unit.

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Hearthstone Quality Home Heating Products, Inc

D.

STERLING-Ht Model 8532

Vertical Terminations - Straight or (2) 45O Elbows (4"x 6” Pipe Only)

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E.

STERLING-Ht Model 8532

Vertical Terminations - (1) or (2) 90O Elbows (4"x 6" Pipe)

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STERLING-Ht Model 8532

ATTACHING YOUR VENTING

Loosen the Phillips head screw and rotate th e
locator, found on the rear middle of the stove toa position which corresponds to the ap propriate
chart setting. Shown below are the app roximate
locations of the settings 1-3; however it can be
set in any position. Ti ghten the screw in thedesired setting.

Follow the instructions in either of the 5”x8”
starter kits. If you are attaching the Top Exit kit,(#95-60320) for vertical v enting configurations,the instructions will be provided with the kit.
INNER COLLAR:
Locate the 8 screw holes where the in ner collar
attaches to the heat exch anger. Attach t he innercollar and gasket with the 8 screws
providedwith the collar.

Note:
These positions are based on lab results and canhave some variance.
IF the vent-air intake s ystem is disasse mbled forany reason, reinstall per the instruction provided
for the initial installation.

OUTER COLLAR:
Locate the 8 screw holes where the outer collar
attaches to the heat exch anger. Attach t he outercollar and gasket with the 8 screws
providedwith the collar.

The flow of combustion and ventilation air
must not be obstructed.

You are now ready to install your venting.

1. Gasket
2. Inner Starter
3. Gasket
4. Outer Starter

VENT RESTRICTOR

When converting the u nit to a top exit, (4”x6”pipe), a restrictor is supplied with the kit.
Instructions for installation of the restrictor aresupplied with the kit. To adjust your restrictor
for maximum flame appearance, first ensure theunit is cool before touching any part of the stoveor venting. Refer to the Venting Configurations
for recommended restriction plate positions.

Restrictor Plate Setting Locations

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STERLING Ht Gas-Fired Direct Vent heater

Cet appareil peut êtreinstallé dans un maison
préfabriquée (mobile) déjà installée à d emeure si lesrèglements locaux le permettent.

Conditionally approved for purchased mobile homeinstallation. This appliance may be installed in anaftermarket permanently located, manufactured(mobile) home, except where prohibited by local
codes.

Cet appareil doit être utilisé uniquement avec les
types de gas indiqués sur la plaque signalétique. Ne
pas l’utiliser avec d’autres gas sauf si un kitde
conversion certifié est installéThis appliance is only for use with the type of gas
indicated on the rating plate. This appliance is notconvertible for use with other gases, unless acertified kit is used, available through your local
Hearthstone dealer.

GAS CONNECTIONS
A top plate and a side cover must be removed toaccess the gas control valve. First re move the gas
control valve knobs, b y grasping the knobs firm ly
and gently pulling straight up o n the knobs. Next
remove the six screws holding the top pl ate on. Two
are located on the sides, a nd four are located on top.
To remove the side cover, loosen the two screws
which have holes in the side for acce ssing. Do notremove these screws, just loosen them.. Slide theside cover upward and remove. The gas suppl y line
connection is made to the Sterling’s gas control
valve, located on the back of the unit, in the lower
right corner, using a 3/8" NPT fitting. The pipe mustbe sized to provide sufficient gas supply to meet the
maximum demand of the unit. The supply line must
include a manual shut-off valve and union so that theunit can be disconnected for servicing.

Gas Supply
Inlet

To Equipment
Inlet

Tee Fitting
3" MIN.
NippleCap

Sediment Trap is required

Use of a dedicated sedi ment trap is required by code ,and by Heart hstone. Damage to com ponents causedby the lack of a sediment trap is
not covered by

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HearthStone Quality Home Heating Products Inc

dealer for replace ment. The decorative fiber log s etwill last a long tim e; however, they will break easil yif subjected to rough or improper handling.

warranty.
Once connected to the gas supply , the gas inlet
pressure, and m anifold gas pressure, must be tested.
The gas control valve has built in pressure taps fortest gauge connections. The supply line pressure must
be tested to ensure it meets the minimum pressure forthe type of fuel in use (NG or LP).

Exact positioning of the log set is required in order t oobtain a pleasing fla me pattern a nd efficient
combustion. Incorrect log
placement can cause
carbon build-up (soot); excess ther mal stress on thelog set and stove parts, reduced efficie ncy, and highlevels of carbon monoxide. If the log set does not fit
into the fire box exactly as outlined, contact yourdealer for assistance.

Pressure Measurements: To measure the gaspressures, connect a manometer to th e gas inlet tap(6) and manifold pressure tap (7)in the Valve
Description Figure.

INSTALLATION OF THE LOG SET

1) First remove the front cast and glass asse mbly.
To remove the front, grasp both sides of thefront cast fa cade, toward the bottom , and lift
upward and then outward. The bottom will slide
up and out. The whole piece is then easily
removed. Set the fro nt aside taking care not t ochip or scratch the enam el. Next, locate the tworotating clips above the gl ass. Rotat e the clips
out of the “locked” position and tilt the top of
the glass outward. Lift the entire glass asse mbly
up and out.

GAS PRESSURE ADJUSTMENT

A qualified technician must connect the heater to thegas supply, and leak test the unit before it is approved
for use. Consult all applicable codes. The appliance,
and its main gas valve, must be isolated from the gas
supply piping system by closing its individual manual
shutoff valve during any pressure t esting of the gas
supply piping system at test pressures equal to o r
greater than ½ psig (3.5kPa).

2) Gently take the logs out of the fire box andremove the bubble wrap from the log set. Be
careful not to damage the log set when
unpacking. There are three logs, a Right, a Leftand a “Twig”.

REPLACING THE GLASSTo replace the front glass, first shut the pilot light off.
Next remove the front cast and glass assembly, as
described in Installation of Log Set s ection. If theglass is broken, pull the broken fragments of glass
away from the glass fra me using heavy-duty gloves,
as the pieces will be very sharp. Carefully replace theglass gasket as necessary, and repla ce the glass
assembly and front cast.
3) Gently place the Right Log (1) in the firebox, on
the ember burner. The right log has a portion of
twig on the top part of it. On the underside ofthe log there is an “L-shaped” cutout that lines
up the log on the ember burner, in theappropriate position. It should sit as shown.

WARNING! Do not use substitute materials.
Use only parts that have been supplied by
Hearthstone,
through an authorized
Hearthstone dealer.

1

CAUTION! Do not clean the glass while theunit is hot. Allow app roximately one hour
before attempting cleaning.

LOG PLACEMENT

Place only the decorative fiber log set supplied withthe unit in the firebox. This log set
is specificallydesigned to work with the provided em ber burner.
Do not use any other type of fiber logs, wood logs, orother materials in the firebox. If the original log set
is damaged, or broken , contact yo ur Hearthstone4) Gently place the Left Log (2) in the firebox, on
the ember burner. On the underside of the log
there is an “ L-shaped” cutout that lines up the17

STERLING Ht Gas-Fired Direct Vent heater

HearthStone Quality Home Heating Products Inc

REMOVAL OF THE LOG SET

log on the ember burner, in t he appropriate
position. It should sit as shown.

CautionLog set retains heat and can be very hot, if
previously lit! Allow 1 hour after pilot light is turne doff before handling.

2

To remove the log set, follow the Installation of
Log Set instructions in reverse. Place the logs andin a safe area where they will not be damaged.

CAUTION
Fragile! Handle log set with care.
5) Gently place the Twig Log (3) in the firebox, on
the ember burner and agai nst the Right Log (1).
The twig sits in a recess ed part of the e mberburner, which lines it up, in the appropriate
position. It should sit as shown.

36) Open the bag of Platinu m Bright Embers. Fluff
up the pieces, and spread randomly over the logs
and burners. These em bers will glow brightly
when the unit is running.
7) Re-install the glass a ssembly by lining up thethree tabs on the bottom of the assembl y withthe three slots on the fire box. Slide t he lower
portion of the glass as sembly into the slots andpush it flush against the firebox. Rotate the clips
into the “loc ked” position. Re-install the front
cast by sliding the upper portion under the lip of
the top and t ilting the bottom in flush with theglass assembly. It should then slide downward
and be snug in place. Make sure t
he glass
assembly is properly secured to the firebox
before turning the unit on. Be careful not to chip
the enamel when installing the glass assembly or
front cast.

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STERLING Ht Gas-Fired Direct Vent heater

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LIGHTING THE UNIT THE
FIRST TIME

to be lit for the first time. Each unit is tested prior to
shipment by the manufacturer, so ignition should takeplace without failure. However, a number of small
adjustments may be necessary to com pensate forvariations in gas pressure, altitude, and other factors
particular to each installation.

CAUTION: Lighting th e Sterling-Ht for the
first time a nd adjustments to the unit shouldbe performed only by quali
fied service
personnel.

Prior to light ing the unit for the first time, wait 5
minutes to allow any residual gas within the unit t odissipate. Smell all around the appliance area for gas.
Be sure to smell next to the floor because some gases(LP) are heavier than air and will settle on the floor.
If you do not smell gas after this five-minute period ,proceed with the lighting procedure. If you do smellgas, do not proceed with the lighting procedure.
Instead, immediately refer to th e What to Do If
You Smell Gas Warnin g, on the c over of thismanual.

SMOKE AND FUMES WARNING
When lit for the first time, the Sterling will emit somesmoke and fumes. This is norm al “off-gassing” ofthe paints an d oils used in the m anufacturing andassembly of the unit. Open windows to vent theroom if nec essary. The off gassing and fum es willsubside after the first 10 to 20 minutes of operation.
ODORS AND IMPURITIESA heater of this t ype may produce odors d uring
heater operation due to im purities that may exist in
the immediate area. Sources of i mpurities can becleaning solvents, paint s olvents, cigarettes, s moke,soot from scented candles, pet hair, dust, adhesives,
new carpet, and/or textiles. Such odors will dissipate.
However, opening a wind ow or otherwise providin g
additional ventilation to the area can alleviate th econdition. If any odor persists, contact your dealer oran authorized service technician.

LIGHTING INSTRUCTIONS

The gas control knobs are located at the top, rightrear corner of the unit (see diagram on next page).
1. Set the on/off/T-stat switch or thermostat to theoff position.
2. Unplug the blower accessory, if so equipped
3. Push in and turn gas control knob clockwise to“OFF”. (If not previously lit, the knob should bein this position.)
4. Wait (5) five minutes to clear out any gas. If you
then smell gas, STOP! Smell all around theappliance area for gas. Be sure to smell next to
the floor because some gases (LPG) 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.
5. Turn gas control knob counterclockwise to“PILOT”.
6. Push in control knob all the way and hold in.
(You should hear the clicking of the igniter in thefirebox) Verify ignition of the pilot. Continue tohold the control knob in for about 20 seconds
after the pilot is lit (ensures thermocouple is up totemperature). Release the knob and it will pop
back out. Pilot should remain lit. If the pilot goesout, repeat the operation.
 If knob does not pop o ut when released, stopand immediately call a qualified service
technician or gas supplier.
 If the pilot will not stay lit after several tries,
turn the gas control knob “OFF” and call aqualified service technician or gas supplier.

PILOT LIGHT

The Sterling has a batte ry operated electric spark
igniter, which ignites the pilot light by m eans of a
spark at the pilot light assembly. To activate theigniter, turn the gas control knob to ‘Pilot’ and pushand hold it down. You must install the included
battery for the igniter. The battery compartment islocated in the lower rear area of the s tove. Do not
attempt to light t he unit with a m atch or by anymeans other than the electric spark.
PREPARE FOR LIGHTING
Prepare for the lighting procedure by adjusting thethermostat to its lowest setting or OFF position. If thegas control knob is not in the OFF position, turn theknob fully clockwise to OFF. Locate the variabl e
output control knob and turn it f ully counterclockwise to the highest setting.
INITIAL ADJUSTMENTS
Once the Sterling-Ht is set in place, connected andassembled as described in the Asse mbly of the Unit,
Electrical Connections, and Gas Supply &Connections sections of this manual, the unit is ready19

STERLING Ht Gas-Fired Direct Vent heater

HearthStone Quality Home Heating Products Inc

2. If shutting the unit off for the non-heating season,turn the gas control knob fully clockwise to the“OFF” position. Do not force the knob to turn.

7. Turn gas control knob counterclockwise to“ON”.
8. Select “ON” or “T-STAT” position on theon/off/t-stat switch.
9. Plug in the blower.
10. Set thermostat to “ON” and set the desired
temperature setting.

PILOT AND BURNER
FLAMES
VARIABLE OUTPUT CONTROLThe gas con trol valve is equipped with a variable
output control. This control varies the rate of heatproduced by the unit by vary ing the ga s pressure to
the main burner tube. The length of the burn cycle isaffected by a combination of heat output and thethermostat setting. If your stove turns on and off too
often, try, first, reducing the burn cycle by turning the
HI/LOW knob, on t he control valv e to a lower
setting. Using the variable output con trol, the heat
output of the unit can be reduced for mild fall andspring months, or m aximized for the colder wintermonths. This adjustm ent can be made, by the
homeowner, as necessary by turning the variabl e
output control knob t o “HI”, “LO”, or any setting in
between.

DETAIL A

TOP OF STOVE

Ht (High Turndown)
The Sterling is equipped with a dual valve sy stem.
This allows for the dramatic turndown thatmostother gas systems do not f eature. Turn the secondary
valve off, and the rear flames go out leaving the front
flames on for a more relaxed ambience simmer. Turnthe rear flames back on to enjoy the high flames formore heat. This Ht system is technologicallydesigned to cover all aspects of heating pleasure.

DETAIL A
ON-OFF-PILOT CONTROLKNOB (SEE LIGHTINGINSTRUCTIONS)HI TURNDOWN KNOBPUSH DOWN AND TURN
CLOCKWISE FROM (-) TO (+) FOR
CONTROL OF HI FLAME

AIR SHUTTER
The air shutter is preset by the manufacturer for
optimum operation and should not need adjustment.
However, it may need adjustment once the unit ha s
been installed to compensate for variations in suppl yline pressure, altitude, and other variables. The air
shutter is used to regulate the air-to-ga s combustion
mixture, which in tur n adjusts the size and color of
the flames.

Once the pilot has been lit, and the gas control knob
has been turned to the“ON” position, the m ainburners
are lit by setting the“ON/OFF/THERMOSTAT” switch to “ON” or to“THERMOSTAT”. If usi ng the optional ther mostat,turn the therm ostat to “ON” and set i t to a higher
position so that it “calls ” for heat (i.e. turns the uniton). The main burners should lig ht immediately.
Note that the thermostat controls the on/off cycling of
the main burners, but the pilot remains lit regardlessof the thermostat setting. To turn the pilot off, t urn
the gas control kn ob fully clockwise to the “Off”
position.

AIR SHUTTER ADJUSTMENTS

The air shutter is adjustable while
the stove isburning. Th e two air sh utters on the em ber burnerare adjustable. The right one (while fa cing the frontof the stove) is for the lo w burn portion of the ember
burner and the left one (while facing the front of thestove) is for the high burn portion of the em ber
burner. The adjusters are located underneath thefront of the unit, and operated by using a 3/8” wrench

TURNING OFF THE UNIT
1. Set the “ON/OFF/THERMOSTAT” switch to the“OFF” position, or turn the thermostat to the“OFF” position.

20

STERLING Ht Gas-Fired Direct Vent heater

HearthStone Quality Home Heating Products Inc

to loosen the bolt. Sliding the control levers forward
or backward will open and close the shutters. Thisnut is hot and should not be touched. Use only metal
tools for this adjustment. Sliding forw ard opens the
air shutter, and sliding ba ckward closes it. Tighten
the nut after making adjust ment. The air shutter isfactory set and only a qualified gas technician shouldmake adjustments. (refer to the image below to see atypical flame pattern)

GAS CONVERSIONSAll Sterling stoves are set up for use with Natural
Gas when built. However, these uni ts are easily
converted for use with LP, and visa versa. Th e
instructions provided wit h the included conversion
kit must be followed. Only a Qualified Gas
Technician should do the conversion.

PILOT ADJUSTMENT
The pilot light is preset by the manufacturer andshould not need adjustment. The pilo t light flame
must be large enough t o engulf the th ermopile andthermocouple located next to the pil ot, but not solarge as to create excessive noise or consume
excessive gas. (refer to the image below) However, it
can be adjusted by means of the pilot light adjustment
screw located on the gas control valve. Access thegas control valve as described in the Gas Connections
section, on p age 16. Note that the pilot flam e must
engulf the t hermopile so that the th ermopile cangenerate sufficient m illi-voltage (325 t o 500-mv) topower the millivolt gas control valve.

For checking, and pr operly adjusting, the manifoldpressure, refer to the Gas Connection section on page
16 of this manual.
Leak test before, and after, lighting the stove.
Fill out the label provided on back of t he stove. The
input rate of the heater is verified by checking the
manifold pressure. If the manifold pressure iscorrect, then the input rate is also correct. Be sure tocheck the ma nifold pressure and prope rly adjust thepilot and main burner flames.

WARNING! The control has an interl ock device. If
the stove has been lit, it will not relight
immediately. After shutting off all gas flow, thepilot burner cannot be relit until the thermocouple
has cooled, allowing th e electromagnet to bereleased (Approx. 60 sec.). The gas control knob isdesigned to operate b y hand. Do not use any tools
during this operation.

HIGH ALTITUDE CONVERSIONSFor high altitude installations, (610-1370 meters,
2000-4500 feet) the orifice sizes (DMS) for NG gas
is 52 & 39 for 4”x6” pipe and 44 & 53 for 5”x8”
pipe. For LP gas, the orifice sizes are 54 & 64 for
4”x6” pipe and 56 & 64 for 5”x8” pipe. See data
plate for additional information. For high altitudes
consult the local gas distributor, or the authority
having jurisdiction for proper rating methods. If aconversion is necessary, the installer must fill out theconversion label provided with the kit and place it on
the unit.

21

STERLING Ht Gas-Fired Direct Vent heater

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ROUTINE MAINTENANCE
AND CARE

fiber logs o ut of the fir ebox, re-install the glass
assembly and briefly light the unit according tolighting instructions described on Page 4. Check toensure a flame is burnin g from each burner port.
Check the pilot. The pil ot flame should be large
enough to en gulf the t hermocouple and therm opile.
Turn the unit off by setting the swit ch to “Off”, andturning off the gas control valve. Allow the unit tocool. Check and clean any bur ner ports that are notburning, or not burning properly. Clean the b urner
ports using a soft brush or vacuum cleaner. Adjust
the pilot flame height if necessa ry. Complete thecleaning procedure by carefully placing the log set
back in the firebox as described on in th e installationof log set on page 17. Close and refa sten the glass
assembly and front cast. Turn on the gas, light theunit and check for proper operation and correct fla mepattern.

The Sterling requires minimal routine maintenanceand care. The unit should alway s be cool and off
when cleaned, or serviced.
Once a y ear the unit an d venting system should be
inspected by qualified service personnel to ensur ethat they are clean, prevent the accu mulation of dust,
lint and other debris, free of obstruction, safe and ingood working condition. To clean the firebox, set theswitch to the “OFF ” position, and turn off the gas at
the gas control valve.
When the unit is cool, remove the front cast and glass
assembly and carefully remove the decorative fiber
log set taking care not to damage the logs or chip theenameled cast iron. Clean the em ber burner, andcarefully vacuum the entire surface of the log set.
Take care to thorou ghly vacuum the ports (holes) on
the top of t he ember burner. With the decorative

22

WARNING! Do not use abrasives whencleaning the glass.

STERLING Ht Gas-Fired Direct Vent heater

HearthStone Quality Home Heating Products Inc

Wiring Diagram - Sterling-Ht DV
10

20

30 c
O

50 60 70 80 90

HearthStone
50 70 90
10

20

30 c
O

Y

OFF

Bk

V

Wiring Color KEY:
Bk

Bk

V

Y

Bk

Bk

W

G

B

R

Br

YG

WIRING INSTRUCTIONS
Caution: Label all wires prior to disconnection when servi cing controls. Wiring errors can cause improper anddangerous operation. Verify proper operation a fter servicing. (Attention: Au moment de l’entretien descommandes, étiquetez tous les fils avant le débranchement. Des erreurs de câblage peuvent entraîun
fonctionnement inadéquat et dangereux.)23

STERLING Ht Gas-Fired Direct Vent heater

HearthStone Quality Home Heating Products Inc

PARTS LISTSPart No.
1541-330
1541-340
1546-462A
1546-463
2510-310
2510-320
2510-330
2510-340
2510-349
2510-350
2510-360
3030-042
3120-530
3120-531
3160-080
3160-530
3160-531
3170-150
3300-565
4700-0620

Description
STONE: TOP SIDE
STONE: TOP, CENTERSTONE: POL,8"x9-1/2", STG
STONE: POL,3-1/2"x9-1/2",STG
FOOT: MATTE,STG
BOTTOM: MATTE,STG
COLUMN: STG
FRONT: STG
HEAT EXCHANGER BASE
HEAT EXCHANGER
TOP: STGGLASSFIREBRICK PANEL: REARFIREBRICK PANEL: SIDEGASKET: TAPE,3/4"x1/16",ADGASKET: SETGASKET: HEAT EXCHANGERPLATINUM BRIGHT EMBERS
RATING LABEL: STG
FRONT TEFLON PADS

5532-010
5532-0145532-015
5532-017
5532-020
5532-0255532-0275532-0295532-040
5532-045
5532-047
5532-050
5532-060
5532-070

STG DV FIREBOXPILOT SHIELD
INLET PLENUMORIFICE MOUNTING PLATE
EXHAUST HEAT EXCHANGER
REAR, TOP HEAT SHIELDLEFT REAR SHIELDRIGHT REAR SHIELD
SIDE STONE RETAINER
BRICK PANEL RETAINERPANEL CLIP
GLASS FRAME
STAINLESS STEEL BAFFLEVALVE BRACKETACCESSORIES AVAILABLE:

BLOWER KIT
95
REMOTE CONTROL ON/OFF
REMOTE CONTROL THERMOSTATSPARK SCREEN
95
FUEL CONVERSION: LP
FUEL CONVERSION: NG
TOP EXIT STARTER KITPart No.
5532-0755532-0775532-090
5532-095

Description
LOW FLAME KNOB, EXTENSION RODHIGH FLAME KNOB, EXTENSION ROD
INLET COVER
HEAT EXCHANGER HINGE PLATE

5870-092

GLASS FRAME RETAINER CLIP

5953-230

AIR DEFLECTOR / HEAT SHIELD

7000-014

THERMOSTAT WIRE: 40' W/ TERMINALS

7000-032

HARNESS: WIRE,ON/OFF,STO/STG/TUC

7211-406
7211-403
7200-243
7200-252
7200-120

ADAPTOR, SIT, CONTROL KNOBHIGH TURNDOWN CONTROL KNOBORIFICE: BURNER HOOD, NG, #43 (HIGH)ORIFICE: BURNER HOOD, NG, #52 (LOW)ORIFICE: BURNER HOOD,LP,#55 (LOW)

7200-263
7210-104
7210-105
7211-054
7211-136
7211-214
7211-215
7211-216

ORIFICE: BURNER HOOD,LP,#63 (HIGH)BATTERY IGINTOR BOX (0373.801)
IGNITOR SWITCH: BATTERY OPER.
GAS MANIFOLD
ORIFICE: PILOT,LP,.35mm,CONVERT TOP
AIR SHUTTERFIBER EMBER BURNER
BURNER INLET TUBE

7211-316
7211-317
7211-318
7211-370
7210-090
7211-470
7211-506
7211-507
7211-508
7211-517

GAS VALVE: HIGH TURNDOWNVALVE REGULATOR:,LP,SIT, CONV.
VALVE: UNREGULATED SIT MAIN BURNER
BURNER:PILOT,CON TOP,3-WAY,NG,
THERMOPILE
THERMOCOUPLE
LOG: LEFT REAR
LOG: RIGHT REAR
LOG: CENTER TWIG
Embers: Charcoal, 4 oz.

KIT #



-5732090-56912
90-56914-6932095-56321
95-56320
95-60320

WARNING! Do not substitute Materials.

For replacement parts, or for information about partsor service, contact your authorized Hearthstone
retailer. For the name of the authorized retailer
nearest to you, visit our website atwww.Hearthstonestoves.com, or e-mail us atinquiry@Hearthstonestoves.com.

24

STERLING Ht Gas-Fired Direct Vent heater

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RATING LABELMODEL #

8532-

SERIAL #MODEL NAME: STERLING-Ht DIRECT VENT GAS FIREPLACE HEATER
LISTED: VENTED GAS FIREPLACE HEATERTESTED TO: ANSI Z21.88-2002 CSA 2.33-M02, CAN/CGA-2.17-M91

CE RTIF IED FOR CANA DA/HO MOLOGUE P OUR L E CANADAALSO F OR MO BILE HOME I NSTAL LATIONCAUTION: DO NO T OPERATE WITH GLASS REMOVED, CRACKED, OR BROKEN.
Replacement on the panel should be done by a licensed or qualified service person.
CAUTIONNER: N’op ère l’appareil avec le verra enlève, craque ou casse. Le
remplacement du panneau devrait être fait par une personne de service qualifié ou aut orisé.

NG

FUEL TYPE:

LP

NG

5” x 8” VENTINGThis appliance must be inst alled in ac cordance with the local
codes, if any, if not; follow the National Fuel Gas Code, ANSI
Z223.1 or Canadian Inst allation Codes, CAN/CGA B149. (Installer
l'appareil selon les codes ou ré
glements locaux, ou, en l'a bsence de tels réglements, selon les
Codes d' installation CAN/CGA-B149.)

LP

4” x 6” VENTING

38,00038,00037,60036,90053, 6338, 5154, 6439, 52
3.3/0.8
1.2/0.3
3.5/0.87 10.0/2.48
5.0/1.24 11.0/2.88
11,60013,90031,30030,200INPUT RATING (Btu/hr) 0-2000 ft
33,000 33,000
INPUT RATING (Btu/hr) 2000-4500 ft
31,500 31,900
ORIFICE SIZE (DMS) 0-2000 ft
43, 52 55, 63
ORIFICE SIZE (DMS) 2000-4500 ft
44, 53 56, 64
MANIFOLD PRESSURE - LO (in. W.c./kpa) 1.2/0.3 3.3/0.8
MANIFOLD PRESSURE - HI (in. W.c./kpa) 3.5/0.87 10.0/2.48
MINIMUM INLET PRESSURE (in.w.c./kpa) 5.0/1.24 11.0/2.88
MINIMUM INPUT RATING (btu/hr) 0/2000 ft 13,600 11,900
MAXIMUM OUTPUT (btu/hr) 0-2000 ft
26,600 27,400

WARNING: Improper installation, adjustment, alteration, service
or maintenance can cause injury or property damage. Ref er t o theowner's information manual provided with this appliance. For
assistanc e or additional information consult a qualified inst aller,
service agency or the gas supplier. (L'AVERTISSEMENT:
L'installation inconvenante, ajustement, modification, service ou
entretien peut causer le dommages de propriété ou blessure.
Référer au manuel d'information de propriétaire fourni cet appareil.
Pour l' assistance ou information supplémentaire consulte unqualifiée installeur, agence de service ou le fournisseur de ga z.)

MINIMUM CLEARANCES TO COMBUSTIBLESEDGE OF TOP TO: CEILING / MANTLE (17”) 14” / 356mm
BACK OF STOVE TO: BACKWALL
2” / 50 mm
EDGE OF SIDE TO: SIDEWALL
4” / 100 mm

ELECTRICAL RATING:
115 VOLTS @ 60Hz, LESS THAN 2.0A

Several Optional kits are available through HearthStone or your local HearthStone dealer. A blower assembly
may be used (kit# 95-57320) , spark screen (kit# 95-69320), top exit(kit# 95-60320), and two different remote controls(kit #90-56912 & kit #90-56914) are optional as well.
This appliance is only for use with the type of gas indicated on this rating plate and may be installed in an aftermarket,
permanently located, manufactured (mobile) home where not prohibited by local codes. See owner’s manual for details. Thisappliance is not convertible for use with other gases, unless a certified kit is used. If the vent air intake system isdisassembled for any reason, reinstall per the instructions provided with the initial instructions. This vented gas fireplace
heater is not for use with air filters. This appliance must be properly connected to a venting system in accordance with the
manufacturer’s installation instructions.
VENTED GAS FIREPLACE HEATER - NOT FOR USE WITH SOLID FUEL.
MANUFACTURED BY: HearthStone, MORRISVILLE, VERMONT 05661
Date of Manufacture
2004

2005

2006

Jan

Feb

Mar

Apr

May

DO NOT REMOVE OR COVER THIS LABEL

Jun

Jul

MADE IN USA

25

Aug

Sep

Oct

Nov

Dec

3300-565

TROUBLESHOOTING GUIDE

Symptom

Possible Cause

1. Pilot will not light.

A. Insufficient gas pressure, A. Using the piezo sparker, try to light the pilot. If it will not
air in the pilot line, or dirty light, check the inlet gas pressure.
or kinked gas line.
B. Pilot orifice plugged.
B. Clean or replace the pilot assembly.
C. Defective or misaligned C. If a match lights a pilot, check the electrode gap andelectrode at pilot.
location. Should be a 1/8" gap in the flame area.
D. Defective igniter.

E. After sitting for "off"season (summer), pilot
assembly may be dirty.
2. Pilot will not stay lit after A. Low or too high gas
carefully following lighting pressure
instructions.

B. Faulty connections.

Corrective Action

D. Check for a good connection between igniter andelectrode. Check wire insulation. If properly connected
and no spark, check/replace battery. With new battery andstill no spark replace igniter.
E. Clean or replace the pilot assembly.

A. Check for proper inlet pressure for the gas being used.

B. Measure voltage between valve body and solder
connection on the rear of the valve (where the blue wire
connects). It should be no less than 7 mV.

C. Defective thermocouple. C1. Ensure that the thermocouple connection at the gas
valve is tight.
C2. Check thermocouple output using milli-volt meter.
Disconnect from valve and read voltage across wire ends.
If the reading is less than 15 mV, replace the pilot
assembly.
C3. If burning NG, check pilot flame to see that it isimpinging on the top of the thermocouple. Clean or
replace pilot for maximum flame impingement.
D. Pilot dirty or plugged.

D. Clean or replace the pilot assembly.

2630034-1

SymptomPossible Cause

3. Pilot burning, no gas to A. Thermostat switch or
main burner, valve knob in wires defective.
the "ON" position,
thermostat and/or
on/off/t'stat switch in the"ON" position.

4. Pilot and burner comeon, but go out after somewarm-up.

Corrective Action
A. Check thermostat/wiring for proper connections. Place
jumper wire across terminals at thermostat. If burnercomes on, replace defective thermostat. If not OK, place
jumper across thermostat wires at gas valve. If burnercomes on, tighten connections, or replace faulty wires.

B. Thermopile may not be
generating sufficient
voltage.

B. Check thermopile output, using a milli-volt meter. If theoptional on/off kit has not been installed, take the readings
across generator terminals of the gas valve. TPTH and
TP). With the on/off kit, take the readings across TH and
Terminal block (which corresponds to #3 on the switch).
Milli-volt reading should be greater than 325 mV. If not,replace the pilot assembly. If the meter reading is OK, but
the burner does not come on, replace the gas valve.

C. Plugged burner orifice.

C. Remove and check burner orifice, clean or replace.
Note: do not use any metal cleaning device, as this may
damage the orifice.

A. Inconsistent, of
insufficient flame on
thermopile.

A. Adjust pilot flame size and assure that the flame is
aimed directly at the thermopile.

B. Insufficient gas pressure. 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.
5. Frequent pilot outage
problem.

A. Pilot flame may be too
low or blowing, (high),
causing the pilot safety todrop out.

6. Glass fogs

A. A normal result of gas
combustion.

7. Blue Flames

A. A normal result during
the first 20 minutes.

A. Clean and/or adjust the pilot flame for maximum
impingement on the thermopile and thermocouple.

A. After the heater has warmed up, the glass should clear.
A. Flames should begin to turn more yellowish after 20
minutes of burning.
B. If the blue color stays; adjust the air shutter for a proper
burn.

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SymptomPossible Cause

Corrective Action

8. Floating flames, lazy ill- A. Potentially dangerous
A. Check the appliance input rate and reduce if necessary.
defined, quiet flames, which incomplete combustion due The air intake/exhaust flow system may be too restrictiveroll around, sometimes
to incorrect air to fuel ratio or blocked (the rate at which the exhaust leaves [draft]completely off of the port, (lack of combustion air or determines the rate at which the combustion air issometimes with overly,
excessive fuel delivery I.e. delivered). Poor draft results in insufficient air delivery or ayellow tips. Possible
excessive gas pressure,restricted exhaust. Correct air intake/exhaust flow system.
sooting. Usually
overrating of appliance).
B1. Clear ports.
accompanied by the odor of B. Incorrect air
B2. Clear obstructions.
aldehydes.
intake/exhaust flow system. B3. Clear obstructions.
Causes may be:
C. If gas pressures are correct and the flames stay theB1. Blocked burner.
same, adjust the air shutter for a proper burn.
B2. Blocked primary air
B3. Blocked secondary air
inlets

9. Burner flashback. Air-gas A. Excessive.
A. Adjust the air shutter for a proper burn.
mixture ignites inside theB. Burner input underrated. B. Check input rate. Check input pressure using aburner near the orifice,
C. Valve leak if flashback manometer. Confirm correct gas pressure at house meter
usually creating a roaring
occurs with burner valve in or tank (call gas company). Confirm burner orifice size.
noise like a blowtorch. The off position.
C. Replace valve. If above corrections do not eliminate
problem is an imbalance of D. Improper gas pipe size. flashback, replace burner.
gas flow velocity and
D. Correct plumbing.
burning speed pattern.

10. Delayed ignition (makes A. Incorrect air-to-fuel ratio. A1. Adjust the air shutter for a proper burn.
A2. Open ports to allow for proper travel of flames.
a sudden "whoosh" noise A1. Primary air incorrect.
as the burner lights). This is A2. Burner ports plugged. B. Reposition logs to eliminate interference with flamea buildup of gas prior to
B. Improper log placement. travel.
ignition. This is moreprevalent with propane (LP)
fuel.

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WARRANTY REGISTRATIONThe Original Purchaser may send a completed and signed Warranty Registration Form, which is enclosed in the Stove warranty
packet, to the following address:
Hearthstone Quality Home Heating Products, Inc.
Warranty Department
317 Stafford Avenue
Morrisville, VT 05661-8695
NOTE: SENDING IN T HE SIGNED WARRANTY REGISTRATION FORM IS NOT A CONDITION OF
WARRANTY COVERAGE OR HEARTHSTONE’S PERFORMANCE.

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