HearthStone Killington User manual

DVI-32/Killington (8870)
GAS-FIRED DIRECT VENT INSERT
HEATER
Manufactured by HearthStone
317 Stafford Avenue
Morrisville, Vermont 05661
[e-mail]
READ THIS OWNER’S MANUAL
Operate and maintain this gas heater
according to instructions in this manual.
Read this manual in its entirety.
FOR YOUR SAFETY: Do not store or use
gasoline or other flammable vapors and liquids in the
vicinity of this or any other appliance.
POUR VOTRE SÉCURITÉ: Ne pas entresposer
ni utiliser d’essence ni d’autre vaperurs ou liquides
inflammables dans le voisinage de cet apprareil ou de
tout autre appareil.
FOR YOUR SAFETY: What To Do If You
Smell Gas:
Do not touch electrical switches.
Do not try to light any appliance.
Do not use the phone in your building.
Immediately call your gas supplier from a
neighbor’s phone.
Follow your gas suppliers instructions.
If you cannot reach your gas supplier, call the fire
department.
POUR VOTRE SÉCURITÉ: Que faire si vous
sentez une odeur de gaz:
Ne pas tenter d’allumer d’appareil.
Ne touchez à aucun interrupteur. Ne pas vous
servir des téléphones se trouvant dans le
batiment où vous vous trouvez.
Evacuez la pièce, le bâtiment ou la zone.
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.
WARNING: Improper installation, adjustment,
alteration, service or maintenance can cause injury or
property damage. Refer to this manual. For assistance
or additional information consult a qualified, service
agency, or the gas supplier.
AVERTISSEMENT: Une installation, un réglage,
une modification, un entretien ou une maintenance
incorrects peuvent entrâiner des dommages matériels,
des lésions corporelles ou la perte de vies humaines.
Consulter le manuel des usagers fourn avec ce
générateur d’air chaud.
10-23-02 6400-1204

1
INFORMATION SHEET
Record on this page, all relevant information concerning the purchase, installation, and maintenance of your
Killington Gas-Fired Direct Vent Insert. This information will facilitate servicing, purchase of replacement parts, and
warranty claims (if necessary). Keep your original receipt in a safe place as proof of purchase.
Serial Number: _______________________
Fuel type (check one) Natural Gas
Liquid Propane
Sold by: ____________________________________________
Phone: Date of Purchase: ________________
Installed by: _____________________________________
Phone: Date of Installation: _______________
Gas Supplier: _____________________________________
Phone: ____________________
Read this Owner’s Manual before installing or operating the Killington heater. Retain this manual for future
reference.
Service Record
Date Who Performed Work Work Performed Notes
_/__/__
_/__/__
_/__/__
_/__/__
_/__/__
_/__/__
_/__/__

OWNER’S MANUAL Model# 8870 Killington
2
TABLE OF CONTENTS
INFORMATION SHEET.....................................................................................................................................................................1
Service Record..................................................................................................................................................................................1
TABLE OF CONTENTS......................................................................................................................................................................2
CODES .................................................................................................................................................................................................2
INTRODUCTION ................................................................................................................................................................................3
SAFETY INFORMATION ..................................................................................................................................................................3
SPECIFICATIONS...............................................................................................................................................................................5
UNPACKING.......................................................................................................................................................................................6
CLEARANCES TO COMBUSTIBLES...............................................................................................................................................7
HEARTH REQUIREMENTS /FLOOR PROTECTION......................................................................................................................7
VENTING COMPONENTS & CONFIGURATION...........................................................................................................................7
Restrictor Disc ..................................................................................................................................................................................7
Venting System Installation..............................................................................................................................................................8
ELECTRICAL CONNECTIONS.........................................................................................................................................................9
GAS SUPPLY AND CONNECTIONS..............................................................................................................................................11
ASSEMBLING THE UNIT................................................................................................................................................................12
Log Placement Within The Unit.....................................................................................................................................................12
Installing The Surrounds To Unit ...................................................................................................................................................12
LIGHTING THE UNIT FOR THE FIRST TIME..............................................................................................................................14
Smoke and Fumes Warning............................................................................................................................................................14
Odors and Impurities.......................................................................................................................................................................14
Pilot Light Warning ........................................................................................................................................................................14
Prepare for Lighting........................................................................................................................................................................14
Initial Adjustments..........................................................................................................................................................................14
Lighting the Unit.............................................................................................................................................................................14
Turning Off the Unit.......................................................................................................................................................................15
PILOT AND BURNER FLAMES......................................................................................................................................................15
Variable Output Control .................................................................................................................................................................15
Pilot Adjustment .............................................................................................................................................................................16
Burner Flame Appearance ..............................................................................................................................................................16
DAILY OPERATION ........................................................................................................................................................................16
MAINTENANCE AND CARE..........................................................................................................................................................17
Cleaning..........................................................................................................................................................................................17
Cleaning the Glass ..........................................................................................................................................................................17
PARTS LIST.......................................................................................................................................................................................19
TROUBLESHOOTING......................................................................................................................................................................20
SAFETY LABEL ...............................................................................................................................................................................22
CODES
Adhere to all local codes or, in their absence, the latest edition of THE NATIONAL FUEL GAS CODE ANSI Z223.1
(NFPA54) which can be obtained from:
AMERICAN NATIONAL STANDARDS INSTITUTE, INC.
1430 BROADWAY
NEW YORK, NY 10018
OR
NATIONAL FIRE PROTECTION ASSOCIATION, INC.
BATTERY MARCH PARK
QUINCY, MA 02269
The appliance when installed, must be electrically connected and grounded in accordance with local codes or, in the
absence of local codes, with the current NFPA 70-National Electrical Code or CSA C22.1-Canadian Electric Code.
For mobile home installation, install per the Manufactured Home Construction and Safety Standard, Title 24 CFR, Part
3280 (U.S.) Or CAN/SCA Z240 MH (Canada). (Installer l’appareil selon les codes ou règlements locaux, ou, en
l’absence de tels règlements, selon les Codes d’installation CAN/CGA-B149.)

OWNER’S MANUAL Model# 8870 Killington
3
INTRODUCTION
Congratulations on the purchase of your
HearthStone Killington Gas-Fired Direct Vent Insert.
The Killington incorporates the latest in energy and gas
technology, which will provide you with clean, efficient
heat for years to come. The combination of elegant cast
iron and durable steel construction gives the Killington
attractive looks and allows for years of durable
performance, which can be maintained with minimal
care.
If there are any questions regarding installation or
operation, which are not answered within this manual,
contact your local dealer or your building inspector.
Your Killington is equipped with a standing pilot which:
1) generates a millivolt signal that powers the
control circuit and;
2) lights the main burner when the switch or
thermostat calls for heat.
This unit is equipped with a variable output control
located on the gas control valve. It allows you to vary
the heat output, along with the flame height, to suit
personal taste. Heat output can be reduced during the
Fall and Spring (when the need for heat is reduced) and
increased during Winter months (when the need for heat
is the greatest). Regardless of how you set the variable
output control, the on/off cycling of the unit is always
controlled by the on/off switch or the optional wall-
mounted thermostat. Also available through your local
HearthStone dealer is an optional front door screen (Kit
#98-69700) which enhances the realistic flame.
The unit is also equipped with a two speed fan which
turns on automatically and off independently of the
burner flames. The fan turns on when the stove is hot
and cycles off when the unit cools down. Allowing the
blower to push warm air only.
The Killington will provide you with years of
economical and convenient service. However, as with
any gas appliance, the unit must be properly installed
and maintained by a qualified service technician to
ensure safe and trouble-free operation.
READ THIS OWNER’S MANUAL
Operate and maintain this gas heater according to
instructions in this manual. Please read this manual in
its entirety, before attempting to light the unit.
SAFETY INFORMATION
By following a few simple safety precautions and by
performing minimal maintenance, your Killington will
remain appealing while providing years of quality
performance.
WARNING
Installation and repair should be done by a
qualified service technician. The appliance
should be inspected before use and at least
annually by a qualified service technician.
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
passages of the appliance are kept clean and
free of obstructions. (S'assurer que le brûleur
et le compartiment des commandes sont
propres. Voir les instructions d'installation et
d'utilisation qui accompagnent l'appareil.
IMPORTANT
Please read and understand all warnings before
installing or operating this heater. Failure to follow
these instructions or improper use of this heater will
void the warranty and can cause serious injury or
death from burns, fire, explosion and carbon
monoxide poisoning. Do not attempt to alter or
modify the construction of this heater or its
components. Any alteration or modification of
construction voids the warranty and the certification
of this heater. Save this manual for future reference.
FIRE HAZARD
Do not store or use gasoline or other flammable vapors
or liquids in the vicinity of this appliance. The Killington
should be located out of traffic and away from furniture,
draperies, clothing, and flammable material.
NEVER BURN PAPER, WOOD, OR
OTHER MATERIALS
This gas heater is designed to burn either natural gas
(NG) or liquid propane (LP). Never burn any fuel which
was not intended for use.

OWNER’S MANUAL Model# 8870 Killington
4
SAFETY INFORMATION Continued
The installation must conform with local codes or, in the
absence of local codes, the current National Fuel Gas
Code, ANSI Z223.1 (NFPA 54).
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 and gas control, which has been under water.
(Ne pas se servir de cet appareil s’il a été plongé dans
l’eau, complètement ou en partie. Appeler un
technicien qualifié pour inspector l’appareil et
remplacer toute partie du système de contrôle et toute
commande qui ont été plongés dans l’leu.)
During the first few hours of operation the appliance
may produce a slight smoke and/or odor. This is normal
during the first several burns. During the initial burn,
open a window(s) to assist in the removal of the
smoke/odor. If the logs appear to smoke, turn the heater
off and call a qualified service technician.
The appliance and its individual shutoff valve must be
disconnected from the gas supply piping system during
any pressure testing of that system at test pressures in
excess of 1/2 psig. (3.5k Pa). The appliance must be
isolated from the gas supply piping system by closing its
individual manual shutoff valve during any pressure
testing of the gas supply piping system at test pressures
equal to or less than 1/2 psig (3.5 kPa).
CERAMIC FIBER LOG SAFETY
INFORMATION
If the decorative ceramic log material supplied with the
Killington is damaged or missing, it must be replaced
with the same, approved replacement parts supplied by
the manufacturer. These components affect the
combustion quality and safety of the heater. Do not
replace fiber ceramic logs with unapproved ceramic logs
or any other material. Always wear gloves and safety
goggles while handling the log set and ember strip.
SHOCK HAZARD
This appliance is equipped with a three-prong
(grounding) plug for protection against shock hazard and
should be plugged directly into a properly grounded
three-prong receptacle. Do not cut or remove the
grounding prong from the plug.
WARNING
This gas appliance must not be connected to a chimney
flue serving a separate solid-fuel burning appliance.
SERVICE CAUTION
If you believe your Killington is not, in any way,
performing properly, immediately discontinue operation
until the unit has been inspected and approved by
qualified service personnel. Prior to servicing the unit,
turn the valve control knob clockwise to “OFF”. The
unit should be cool prior to servicing and cleaning. Any
component removed during servicing should be replaced
prior to operation. Use of any components not supplied
by HearthStone on the stove voids all warranties. Do
not substitute components.
DO NOT LIGHT PILOT OR MAIN
BURNERS BY HAND
The standing pilot light equipped with this gas heater is
lit by using a piezoelectric spark generator, as described
in the How To Turn the Unit On & Off section of this
manual. Never attempt to light the pilot or main burners
by hand (with a match or lighter). After repeated
attempts, if the pilot light fails to light, discontinue
operation, turn off the gas at the gas control valve, and
immediately contact qualified service personnel for
assistance.
HOT SURFACES
Certain exposed surfaces of the Killington will reach
high temperatures during normal operation. Clearances
to combustibles must be maintained, as specified in the
Clearances To Combustibles section of this manual. Due
to high temperatures the appliance should be located out
of traffic and away from furniture, draperies, clothing
and flammable materials. Children and adults should be
alerted to the hazards of high surface temperatures and
should stay away to avoid burns to skin or clothing
ignition. Young children should be carefully supervised
when in the same room as the appliance. Clothing or
other flammable material should not be placed on or near
the appliance. (Surveille les enfants. Garder les
vêtements, les meubles, l'essence ou autres liquides à
vapeur inflammables lin de l'appareil.) Clean the area
around, under, and behind the unit on a regular basis to
prevent the accumulation of dust and lint.
MUST BE VENTED TO THE OUTSIDE
Never vent the gas heater to other rooms or buildings.
Do not burn the gas heater with the front open. Do not
burn gas heater with broken glass. Only open front for
routine service. Do not slam or strike glass.

OWNER’S MANUAL Model# 8870 Killington
5
SPECIFICATIONS
Listed:
Direct Vent Gas Fireplace
Model:
Killington Direct Vent Insert Room
Heater
Testing Agency:
Intertek Testing Services NA Inc.
(ITS)
Tested to:
ANSI Z21.88-1998CSA 2.33-M98
CAN/CGA2.17
Certified for use by:
Board of State Examiners of Plumbers and Gasfitters
100 Cambridge Street, Room 1511
Boston, Massachusetts
02202
NaturalGas LP
Input rating (Btu/hr) 31,000 31,000
Maximum output (BTU/hr) 23,200 23,800
Minimum input rating (Btu/hr) 20,800 24,800
Orifice size DMS 46 56
Man. pressure-HI setting (in. w.c./kPa) 3.5/1.15 10.0/2.48
Man. Pressure-Lo setting (in.w.c./kPa) 1.6/0.42 6.4/1.59
Inlet pressure-HI (in. W.c./kPa) 10.5/2.6 14.0/3.47
Inlet pressure-LO (in. W.c./kPa) 5.0/1.24 11.0/2.88
Conditionally approved for purchased mobile home
installation. This appliance may be installed in an
aftermarket permanently located, manufactured (mobile)
home, where not prohibited by local codes.
This appliance is only for use with the type of gas
indicated on the rating plate. This appliance is not
convertible for use with other gases, unless a qualified
HearthStone kit is used.
Cet appareil peut être installé dans un after market situé
définitivement, fabriqué (mobile) logement, où ne
prohibé pas par des codes ocaux.
Cet appareil est seulement pour l’emploi avec le type de
gaz indiqué sur l’assiette d’évaluation. Cet appareil
n’est pas décapotable pour l’emploi avec autres gaz, à
moins qu’un équipement certifié est employé.
Figure 1: Dimensions
FRONT VIEW
LARGE SURROUND
44"
31 3/4" 27 1/2"
SMALL SURROUND
FRONT VIEW
38"
27 3/4"
16"
TOP VIEW
15 1/4"
EXHAUST
INTAKE
19 3/4"
SIDE VIEW

OWNER’S MANUAL Model# 8870 Killington
6
UNPACKING
The Killington is packaged by the manufacturer to
withstand shipment, without damage, under most
circumstances. However, damage can occur during
transit and handling. Care should be taken when
unpacking, inspecting for damage, and installing the
unit. If any damaged or missing parts are detected,
immediately contact your dealer.
A complete Killington is shipped with three packages.
Locate and remove these packages. Package #1 will
contain the Log Set. Package #2 will contain the front
set, doors, and grills. Package #3 will contain the
optional surround if ordered. Lift the stove off the pallet
and partially insert it into the fireplace, (with regards to
the Clearances To Combustibles section on page 7 of
this manual). Carefully remove the surround set and
front set from the packaging carton.
Inspect for Damage
Inspect the Killington for visible and/or concealed
damage. The unit should appear to be square and true.
The sheet metal parts should be smooth and free of
bends and/or dents. If the heater is enameled, the
enameled cast iron should be free of chips and/or cracks.
If visible or concealed damage is found or suspected,
contact your local dealer for instructions. To open the
firebox, reach over the firebox, and under the front grill.
With a flat screwdriver pry the retaining clips up. There
will be four separate clips. Be careful, when you lift the
last one, as it will free the glass and frame from the unit.
Refer to Figure 10, in the Installing The Surrounds
section on page 12. Pull the top of the glass towards
your body, and lift the glass and frame up and away
from the unit. Carefully set the glass and frame away
from the unit, as it will need to be installed later. Inspect
the log set for damage. It is important to wear safety
goggles and gloves when handling the log set. If a
damaged log is encountered, contact your local dealer
for a replacement log. Put the log set, aside. It will be
installed later.
You Will Need the Following to Complete the Installation
Of The Unit
Surround Set (See Dimensions Above)
Two - 3" Flex Liners (Dura-Vent #2280)
Co-Linear Chimney Liner Termination Kit (Dura-Vent
#923GK)
High Wind Termination Cap (Dura-Vent #991)
Four - 3.5" Hose Clamps
Gas Hookup Equipment/Tools
High Temperature Silicone
Small Level
Phillips Screwdriver
Slotted Screwdriver or 5/16" Nut Driver
Thread Sealant
Open End Wrenches or Adjustable Wrench
Permanent Marker
Fiberglass insulation
Safety glasses
Gloves
An external regulator (for Propane/L.P. gas only)
Gas piping which complies with local codes
Pipe sealants approved for use with propane/L.P. Gas
(resistant to sulfur compounds)
A manual shutoff valve for the gas supply
A sediment trap

Pipe wrenches
Components
1- Killington DV Heater
Package #1
- 6 Decorative Logs
- 1 Ember Screen-T-Stat
- 2 Bags of Embers
- 40’ Wire
- 1 Andiron
- 1 Andiron Support
- 1 LP Conversion Kit
- 1 3/8” Flex Tube
- 1Restrictor Disc
- 2Metal Surround Flanges
Package #2
- 2 Doors
- 1 Grill
- 1 Frame
- 1 Hardware Set
- 1 Steel Set
Package #3
- 1 Top surround cast
- 1 Left side surround cast
- 1 Right side surround cast
- 1 Hardware set
- 1 Top steel heat deflector

OWNER’S MANUAL Model# 8870 Killington
7
Figure 2:
COMBUSTIBLES CAN NOT EXTEND
BELOW THE TOP OF THE SURROUND,
NON-COMBUSTIBLES CAN.
(INCHES)
AIR
TOP OF
ABOVE
HEIGHT
MANTLE DEPTH
16
COMBUSTIBLE
MANTLE IN
THIS AREA
12
10
8
6
2
TRIM OR
(INCHES)
4
14
18
20 2 4 6 8 10 12 14 16 18 20 22
OPENING
COMBUSTIBLEMANTLENOTALLOWEDBELOWTHISLINE
15" - WITH 7.5" MANTLE
NO HEARTHPAD REQUIRED
13" - WITH 1" MANTLE
8" - TO ALL SIDE WALLS
MANTLE HIEGHT IS MEASURED FROM
THE TOP OF THIS AIR OPENING
*INSULATION
24-5/8"
Clearance To Combustibles (* Insulation is recommended)
CLEARANCES TO
COMBUSTIBLES
Due to high surface
temperatures, the unit should
be located out of traffic and
away from furniture and
draperies. Clothing and other
flammable material should
not be placed on or near the
heater. Always maintain
adequate clearances around
the air openings into the
combustion chamber and
allow for adequate
ventilation. Minimum
clearances to combustibles
must be maintained as shown
in Figure 2.
HEARTH
REQUIREMENTS
/FLOOR
PROTECTION
The Killington can be
installed on wood flooring or
a non-combustible surface.
For installation of the unit on
carpeting, vinyl tile, or other
combustible materials other
than wood flooring, the unit
shall be installed on a metal, wood, or other non-
combustible hearth.
NOTE: Some wood floor varnishes, stains, or
polyurethanes may be affected by heat.
VENTING COMPONENTS &
CONFIGURATION
The Killington cannot be vented jointly with any other
solid fuel or gas appliance. The Killington must be
vented directly to the outside of the building using a
proper termination as listed below. The venting
configuration is shown in Figures 4 & 5. If the vent-air
system is disassembled for any reason, reinstall per the
instructions provided in the Assembling The Unit section
of this manual on page 12.
Restrictor Disc
Your Killington has been supplied with a restrictor disc.
This disc will provide excellent restriction for vertical
vent runs exceeding 20 feet. If your vertical rise is less
than 20 feet, do not use the restrictor. See Figure 3.
Figure 3: Restrictor

OWNER’S MANUAL Model# 8870 Killington
8
8" MIN.
EXHAUST
INTAKE ACCEPTABLE
GAS SUPPLY
POSITIONS
Figure 5
1.Chimney Liner System*
1. Two Sections 3" Co-Linear Flex Liners (10ft
Min./40 ft Max.). Dura-Vent #2280
2. Chimney Liner Termination Kit (Includes Co-
Linear to Co-Axial Termination and Flashing)
Dura-Vent #923GK
3. High Wind Termination Cap Dura-Vent #991
4. High Temperature Silicone
5. Four 3-1/2" Hose Clamps
*Available through your local HearthStone dealer.
Venting System Installation
Before You Begin
Make sure the masonry fireplace and flue comply with
the applicable codes and are in good condition. Repair
any damage before installation of the Killington begins.
Prepare a zero clearance (metal) fireplace by doing the
following:
-Place the label provided on the Z.C.
-Remove the damper, grate, and log set.
-If necessary, remove the smoke shelf, internal
baffles, screen, masonry lining and doors. (see the
Dimensions in Figure 1).
-DO NOT remove any insulation or structural frame
members.
-DO NOT remove or alter the metal sides, floor,
door frame, or face of the fireplace.
The gas line will enter the valve on the right
side of the unit, with a 24” flexible
connector which is provided.
Installation of The Co-linear Vent
Pipe
 Mark each end of one of the flexible
vent pipes “intake” with a permanent
marker. Mark each end of the other
flexible vent pipe “exhaust”.
Apply the high temperature silicone on
the upper portion of the vent (flex pipes to co-linear
to co-axial adaptor). Important: Make certain the
pipe connected to the exhaust on the stove connects
to the exhaust portion of the co-linear to co-axial
adaptor. Be sure to meet all the manufacture’s
requirements when installing the adaptor and cap
assembly. Follow the manufactures instructions
when installing the same. (The exhaust pipe on the
*INSULATION
Termination Cap #991
Chimney Liner
Termination Kit
3" Co-Linear Flex
Extensions(10'-40')
Flue
3.5" Hose
Clamps
Fireplace
Fireplace
High Wind
Figure 4 (*Insulation recommended)

OWNER’S MANUAL Model# 8870 Killington
9
co-linear to co-axial adaptor is the pipe that is in the
center of the adaptor.)
Repeat this process to the top outer edge of both the
intake and exhaust collars on the back of the unit.
The exhaust adaptor is the collar nearest the center
of the unit, the intake adaptor collar is on the right
side of the stove (refer to Figure 1, on page 5 &
Figure 5 on page 8). Install the restrictor if
necessary(refer to Figure 3 on page 7). Slide a hose
clamp over the ends of both flexible vent pipes.
Place the flexible vent pipe marked “intake” onto the
intake collar, place the flexible vent pipe marked
“exhaust” onto the exhaust collar. Secure them to
the collar adaptors by tightening the hose clamps
with a slotted screwdriver or 5/16" nut driver.
The following guidelines must be observed when
installing the vent pipes:
⊄ Do not install the venting into a chimney
serving another appliance, be it fossil fuel,
solid fuel, or another gas.
⊄ Do not crimp or rupture the vent pipes.
⊄ Both the Exhaust and Intake vent pipes must
reline the entire length of the chimney. The
exhaust and inlet vents must terminate
above the top of the chimney using the
appropriate vent termination components
listed in these instructions.
2.Using the existing chimney as an air inlet
The chimney flue must be carefully sealed from the
room environment. Fabricate a plate of non-
combustible material and carefully fit it to the
damper area with high temperature sealant.
This stove is certified for use with a coaxial
venting system. ANSI Z21.88 standards state
that the maximum leakage rate for the venting
system is 32 SCFM @ .06” w.c. This leakage
must be accounted for if you use the chimney for
intake air.
Air Intake
Chimney Liner
Termination Kit (Exhaust to center connector)
3" Co-Linear Flex
Extensions(exhaust must be within 10'-40')
Exhaust
Non-combustible damper
seal:
1) Must support inlet flex pipe
2) Musr seal chimney opening around
inlet and exhaust flex pipe
Inlet:
Must extend through the damper seal
NOTE: All joints must be sealed. Leakage around
the damper seal must be avoided.
WARNING: This installation may not work in a
negative pressure environment, or if a seal
cannot be attained. If sooting, ghosting of flame
occurs, please check and repair leakage of
chimney system.
ELECTRICAL CONNECTIONS
NOTE: OPEN VALVE DOOR ON THE CENTER
BOTTOM OF THE FRONT FOR ELECTRICAL
AND GAS CONNECTIONS
Electrical Grounding Instructions
The following installation procedure is not
covered under the ANSI Z21.88 test
method and product certification. Use of an
existing chimney as an air intake must be
specifically approved by your gas supplie
r
and the local code Authority Having
Jurisdiction.

OWNER’S MANUAL Model# 8870 Killington
10
Bk
W
Y
VG
G
W
Bk
R
B
G
W
are shown on opposite side.
NOTE: Numbers on switch
B
Bk
V
W
R
213 12
V
Y
Bk
Y
3
Wiring Color KEY:
Figure 6
This appliance is equipped with a three-prong
(grounding) plug for your protection against shock
hazard and should be plugged directly into a properly
grounded three-prong receptacle. Do not cut or remove
the grounding prong from this plug. Place the receptacle
to the right of, or behind the unit.
Switch Plate
The Killington comes pre-wired to the control switches.
To install, simply use the two 10-24 x ½” screws to
mount the plate to the left surround panel. The plate will
fit in the recessed side of the surround.
Thermostat
The fireplace insert is operated by the on/off/thermostat
switch. The Killington may also be controlled by the
wall mounted thermostat for automatic operation. We
recommend installation of the thermostat for more
comfortable, automatic performance, however you may
still override the thermostat by setting the switch to
“on”. The thermostat controls the unit by “calling for
heat.” The thermostat turns the unit on when the room is
cold, and turns the unit off once the room is warmed
sufficiently. The thermostat is controlled by a 750
millivolt DC two-wire circuit. The thermostat comes
with 40' (12m) of thermostat wire.
Thermostat Wiring
The thermostat wire from the unit to the thermostat can
be surface mounted, routed under the floor, or through
walls, etc. The thermostat should be connected to the
unit using the 40' (12 m) of insulated thermostat wire,
provided, but must not exceed 40' (12 m) in length. Be
sure to leave a small coil of wire behind the unit so that
it can be moved out of position for servicing and
cleaning.
Thermostat Placement
The thermostat should be placed in the same room or
living space as the unit. Typically 5' (1.5 m) off the
floor and away from any influences that may cause the
temperature in the vicinity of the thermostat to be
unrepresentative of the room temperature in general.
Such influences might include strong lighting, a heater
vent from the central heating system, or a nearby drafty
window. Placement of
the thermostat on an
inside wall rather than
an outside wall is
preferable. Do not place
the thermostat directly
over or too close to the
unit, otherwise heat
from the unit will
immediately satisfy the
thermostat and turn the
unit off.
Wiring
Instructions
(Location of the valve
post connections can be
found by opening the
bottom center grill on
the front of the unit.
Also refer to Figure 7
on page 11.)
The proper location of
wire connections is
shown in figure 6, on
the this page. When
making these
connections, position
the thermostat wire so it
extends out the side
surround panel towards
the thermostat. (At the

OWNER’S MANUAL Model# 8870 Killington
11
thermostat, the wires should be connected to the two
connection screws on the back of the thermostat per the
instructions received with the thermostat). Take care not
to over-tighten the connection screws and not to damage
the internal parts of the thermostat. Now attach the
wires in their proper location on the firebox.
GAS SUPPLY AND CONNECTIONS
NOTICE: A qualified technician must connect the
heater to the gas supply and leak test the unit before
it is approved for use. Consult all local codes.
WARNING: The unit must be installed and connected
in accordance with local codes, or in the absence of local
codes, with the most current edition of the National Fuel
Gas Code ANSI Z223.1.
We recommend using new black iron or steel pipe only.
Internally tinned copper tubing can be used in some
areas when permitted by local codes. Only use pipe of
sufficient diameter to allow full gas volume to heater,
without undue loss of pressure. Excessive pressure loss
will occur if the pipe is too small.
The gas supply line must include a manual shut-off
valve and union so the unit can be disconnected for
servicing. Also a sediment trap and a 1/8" N.P.T.
plugged tapping 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 and burners. Failure to install a sediment
trap could prevent the heater from operating reliably.
The 1/8" N.P.T. plugged tapping is installed for the test
gauge connection (immediately upstream of the gas
supply connection). Damage to the valve caused by
lack of a sediment trap will not be covered by the
warranty.
We have supplied a 24" flexible stainless steel gas line
for installation convenience and to avoid undue
mechanical load on the valve. We recommend using the
flexible line, but also refer to local code. The gas supply
line connection is made to the flexible line in the lower
rear right portion of the Killington. Apply a thread
sealant to both male ends on the flexible gas line.
Thread one end directly into the valve and the other to a
3/8" connector on the gas line.
CAUTION: Check Gas Type! This unit is supplied as
NG only. The gas supply must be the same as stated on
the heater’s rating plate (located on the unit). If the gas
supply is different, DO NOT INSTALL the heater.
Contact your dealer for the correct model or conversion
kit.
Gas Pressure Adjustment: A QUALIFIED
TECHNICIAN MUST PERFORM THIS PROCEDURE
The supply line pressure is tested, to ensure it meets
minimum pressure requirements, as listed in the
Figure 7

OWNER’S MANUAL Model# 8870 Killington
12
Specifications sections of this manual, for the type of
fuel in use (NG or LP). The unit 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 1/2 psig. During tests in excess of 1/2 psig. (14"
w.c.), the heater must be disconnected from the gas
supply system. Test by connecting a manometer to the
supply line. Adjust the incoming pressure, if necessary,
to meet the required supply line pressure. Once
connected to the gas supply, the gas inlet pressure and
manifold gas pressure must be tested. The gas inlet tap
(6) and manifold pressure tap (7) is located on the
control valve (see Figure 7). Connect a manometer to
the test points on the gas control valve, refer to #’s 6 & 7
of Figure 7 for locations.
NOTE: For installations from 610-1370 meters (2000-
4500 ft.) the orifice sizes (DMS) for natural and
propane gas are 47 and 57 respectively (2 each). (Cet
appareil est equipé pour des altitudes compries entre et
2000-4500 pieds (610-1370m) seulement.) 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 unit must be adjusted, the information sticker
(provided with the high altitude kit) must be filled out
completely and mounted to the unit per the instructions
provided with the kit.
ASSEMBLING THE UNIT
Log Placement Within The Unit
Fragile! Handle logs with care. Always wear gloves
and safety goggles while handling the log set.
NOTE!The rear and middle logs with “locator” posts
should be on the right side of the firebox when installed.
The logs set and an ember screen must be placed in the
firebox at their precise location. Remove the front
glass as described in the Inspect for Damage section of
this manual, on page 6. Using the “locator” tabs on the
bottom of the rear logs, position the rear logs on the
ridge to the back of the firebox near the base of the
firebox. Next, place the two middle logs with grooves
over the two burner tubes. The face should be parallel to
the leg of the burner tubes. Now the center rear twig
will fit over the “locator” posts on both the rear and
middle logs. Position the front log in front of the burner
tubes on the base of the firebox. Place steel andiron
support centered on top of the front log. Place the ember
screen over the two burner tubes. It will fit tightly
around the right middle log and in front of the left
middle log. Next, place the andiron on the steel andiron
support groove on the front log.
The log set should appear as in Figure 9.
NOTE
When installing the embers be sure to leave gaps
throughout the burner. (This is important to allow for
proper ignition of the burner tube) It is recommended to
experiment with arranging of the embers to achieve a
pleasing flame pattern. Leave embers off the pilot to
allow the pilot flame to ignite the ignition ports on the
burner tube.
Open the two bags of embers and distribute the large
embers evenly across the burner tubes, on top of the
ember screen. Next, scatter the small embers throughout
the burner to create a pleasant flame pattern, leaving
gaps throughout the burner. Install the front glass by
following the instructions as described in the Installing
the “Glass and Frame” section on page 13 of this
manual.
Log Set Removal
To remove the log set, follow the “Log Placement
Within the Unit” instructions in the reverse order on
page 12.
Installing The Surrounds To Unit
(Refer to Figures 10 & 11)
You will need to determine which surround set you will
need, the standard or the large using the following
dimensions:
Standard Surround Set Large Surround Set
Height: 27.5" Height: 31.75"
Width: 38" Width: 44"
Each surround set will have the following hardware:
Figure 9: Log Placement

OWNER’S MANUAL Model# 8870 Killington
13
FRONT CAST ASSEMBLY
SWITCH BRACKET
MOUNTING LOCATION
SURROUND ASSEMBLY
STEEL HARDWARE ATTACHED
TO SURROUND
FULL FIREBOX ASSEMBLY
WITH GLASS FRAME ATTACHED
Figure 11
1 – Left Side Panel
1 – Right Side Panel
1 – Top Panel
2 – Top To Side Panel Clips
(w/ 8 10-24 x 1/2 bolts)
1 – Modesty Panel (w/ 3 10-24 x 1/2 bolts)
2 – Surround To Grill Clips (w/ 2 10-24 x 1/2 bolts)
4 - 10-24 x 1/2 bolts (for surround to firebox fit)
NOTE: The large and small surround sets use the same
hardware kits.
Attach the left and right flanges, which come in the
log accessory box, to the sides of the firebox, using
the four screws also included. (for
placement see figure 10)
 Attach the two side surrounds to the
firebox using 4 screws, 2 per side.
 Attach the top decorative grill to the two
side surrounds by using one screw and
one clip per side.
 Attach the top surround to the two side
surrounds by using one clip and four
screws per side.
 Attach the steel modesty panel to the top
surround by using 3 screws to the top
panel.
 Attach the switch plate to the surround
using 2 10-24 x 3/8” self tapping
screws.
WARNING: Failure to position the parts in
accordance with the Figures in this manual, or
failure to use only parts specifically approved with
this appliance may result in property damage or
personal injury
Installing The Unit
Place a level on top of the unit. Leg leveling bolts are
located in the front and rear of the base plate.
Adjust the rear leveling bolts now as they will not be
accessible once the unit is fully inserted into the
fireplace.
Push the unit as far into the fireplace as you can,
leaving just enough room for the fan power cord to
exit on the bottom right side, between the surround
and fireplace.
 Before replacing the front cast, carefully unwrap and
place the log set into the unit. Refer to the Log
Placement section of this manual, on page 12 for the
precise positioning of the log.
Installing The Glass And Frame
(Refer to Figures 10.)
 Set the bottom of the glass frame into the two
grooves on the bottom of the firebox.
 Push the top of the glass/frame into the firebox.
GLASS FRAME
TOP FLANGE OF
FIREBOX
RETAINING CLIP
(OPEN POSITION)
(CLOSED POSITION)
RETAINING CLIP
RETAINING TAB
GLASS FRAME
AIR SHROUD
FIREBOX
SURROUND
MOUNTING
BRACKET
SURROUND NOT SHOWN FOR CLARITY
NOTE:
Figure 10

OWNER’S MANUAL Model# 8870 Killington
14
 Pull the 4 retaining clips down, securing the glass
into the firebox seal.
Attach the front cast to the firebox by setting the two
knobs into the receiving holes on the firebox.
Center the front and push the top in until it “clicks”
shut.
Place a level on the top of the unit. Two leveling leg
bolts are located in the front of the base plate. Use a
wrench to turn these bolts up or down as necessary to
level the unit. Note, leveling bolts are also located in the
back of the base, but the insert must be pulled out of the
fireplace to gain access to them.
LIGHTING THE UNIT FOR THE
FIRST TIME
CAUTION: Lighting the Killington for the first
time and adjustments to the unit should be
performed by qualified service personnel.
Smoke and Fumes Warning
When lit for the first time, the unit will emit some smoke
and fumes. This is normal “off-gassing” of the paints
and oils used in the manufacturing and assembly of the
unit. Open windows to vent the room if necessary. The
off-gassing and fumes will usually subside after the first
10 to 20 minutes of operation.
Odors and Impurities
A heater of this type may produce odors during heater
operation due to impurities that may exist in the
immediate area. Sources of impurities can be cleaning
solvents, paint solvents, cigarettes, smoke, pet hair, dust,
adhesives, new carpet, and/or textiles. Such odors will
dissipate. However, the condition can be alleviated by
opening a window or otherwise providing additional
ventilation to the area. If any odor persists, contact your
dealer or an authorized service technician.
Pilot Light Warning
The Killington has a piezoelectric spark ignitor (the
push button located next to the gas control valve behind
the valve access door), which ignites the pilot light by
means of a spark at the pilot light assembly. Do not
attempt to light the unit with a match or by any means
other than the piezoelectric spark ignitor
Prepare for Lighting
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 knob and turn it fully clockwise to the highest
setting.
Initial Adjustments
Once the Killington has been set in place, connected and
assembled as described in the Assembly Of The Unit,
Electrical Connections, and Gas Supply & Connections
sections of this manual, the unit is ready to be lit for the
first time. Each unit 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.
Prior to lighting the unit for the first time, wait 5 minutes
to allow any residual gas within the unit to dissipate.
Smell all around the appliance area for gas. Be sure to
smell next to the floor because some gases are heavier
than air and will settle on the floor. If you do not smell
gas after this five-minute period, proceed with the
lighting procedure. If you do smell gas, do not proceed
with the lighting procedure. Instead, immediately refer
to the What To Do If You Smell Gas Warning, on the
cover of this manual.
Lighting the Unit
NOTE: The gas control knobs and the piezo ignitor are
located behind the lower gas control access door.
1. STOP! Read the What To Do If You Smell
Gas! warning (on the cover of this manual).
2. Set the control switch to “OFF”, and (if so
equipped) the thermostat to the “OFF” position.
3. Push in and turn the gas control knob clockwise
GAS VALVE CONTROL
KNOBS
IGNITOR
LOWER GRILL
SHUTTER POSITION
INDICATOR
SET SCREW
OPEN
CLOSED
ROTATIONROTATION
Figure 12: Controls

OWNER’S MANUAL Model# 8870 Killington
15
to “OFF”.
4. Wait (5) five minutes to clear out any gas. If
you then smell gas, STOP!, immediately follow
the What To Do If You Smell Gas! warning
(on the cover of this manual). Smell all around
the appliance area for gas. Be sure to smell next
to the floor because some gases are heavier than
air and will settle on the floor. If you do not
smell gas, proceed to the next step.
5. Push in and turn the gas control knob
counterclockwise to “PILOT”.
6. Push the control knob in all the way and hold it
there. Immediately light the pilot with the piezo
lighter (push in and “click” the piezoelectric
spark ignitor button several times until lit).
Continue to hold the control knob in for about
20 seconds after the pilot is lit. Release the knob
and it will pop back out. The pilot should
remain lit. If the pilot goes out, repeat the
operation.
• If the knob does not pop out when
released, stop, shut off the gas supply to
the heater, and immediately call a
qualified service technician or gas
supplier
• If the pilot will not stay lit after several
tries, turn the gas control knob
clockwise to “OFF” and call a qualified
service technician or gas supplier.
7. After the pilot lights, turn the gas control knob
counterclockwise to “ON”.
8. Shut the gas control valve access door.
9. Set the “ON/OFF/THERMOSTAT” switch to
“ON” or to “THERMOSTAT”. If using the
optional thermostat, turn the thermostat to “ON”
and set the desired temperature.
NOTE: When pressing/clicking the piezoelectric spark
ignition button to light the pilot, watch through the glass
(front) of the unit. “Click” the ignitor button until a
flame is visible at the pilot. Once the pilot is lit,
continue to press on the gas control knob for another 20
seconds, then release. Ascertain that the pilot 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 fails to light or if it went out due to
a premature release of the gas control knob while
pressed in the “PILOT” position, wait 60 seconds for the
Interlock to release. Then repeat the lighting process as
described in this section of the manual.
Once the pilot has been lit, and the gas control knob has
been turned to the “ON” position, the main burners are
lit by setting the “ON/OFF/THERMOSTAT” switch to
“ON” or to “THERMOSTAT”. If using the optional
thermostat, turn the thermostat to “ON” and set it to a
higher position 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 burners is
controlled by the thermostat, but the pilot remains lit
regardless of the thermostat setting. To turn the pilot
off, turn the gas control knob fully clockwise to the
“Off” position.
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
(APRX. 60 SEC). THE GAS CONTROL KNOB IS
DESIGNED TO BE OPERATED BY HAND. NEVER
USE ANY TOOLS DURING THIS OPERATION. IF
THE KNOB WILL NOT PUSH IN OR TURN BY
HAND, DON’T TRY TO REPAIR IT, CALL A
QUALIFIED SERVICE TECHNICIAN. DAMAGED
KNOBS MAY RESULT IN FIRE, EXPLOSION, OR
SERIOUS INJURY.
Turning Off the Unit
1. Set the “ON/OFF/THERMOSTAT” switch to the
“OFF” position, or turn the thermostat to the “OFF”
position.
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.
PILOT AND BURNER FLAMES
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
Figure 13: Top Convertible Pilot

OWNER’S MANUAL Model# 8870 Killington
16
turns on and off too often, try, first, reducing the burn
cycle by turning the HI/LOW knob, on the control valve
to a lower setting. 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”, “LO”, or any setting in between.
Air Shutter
Only qualified personnel should adjust the air
shutter. The air shutter is used to regulate the air-to-gas
combustion mixture which influences the size and color
of the flames. The air shutters have been positioned in
the general location needed for the type of gas being
used. If the stove is being converted for use with a
different fuel the air shutters will need repositioning. If
the unit is not burning as well as it should, then the air
shutters may need adjusting. To adjust the air shutters,
open the valve control door and locate the shutter
position indicator, as shown in Figure 12. Loosen the
position indicator set screw. The rod should be free to
move. The open position (LP) is a counterclockwise
rotation, and the closed position (NG) is a clockwise
rotation. Carefully adjust the position of the shutter
indicator to the desired location. Then tighten the set
screw. Very little movement is needed to substantially
change the burn and flame pattern.
Pilot Adjustment
The pilot light is preset by the manufacturer and should
not need adjustment. The pilot flame should be large
enough to engulf the thermopile and the thermocouple,
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. Open the valve door to access the pilot
adjustment screw. Refer to # 3 of Figure 7, on page 11,
to determine the location of the pilot adjustment screw.
Note that the pilot flame must engulf the thermopile so
the thermopile can generate sufficient milli-voltage (325
to 750mv) to power the millivolt gas control valve. The
flame on the pilot should look like Figure 13.
Controlling the Killington by the wall mounted
thermostat may become erratic, nonexistent, or the unit
may go out, if the pilot flame is too small or misdirected
away from the thermopile.
Burner Flame Appearance
Once the unit is lit, observe the flame pattern and adjust
as necessary. Also a periodic visual check of the burner
flame should be performed. To determine if the burner
flame needs adjustment, it is necessary to view the flame
pattern with the variable output control knob at its
highest setting(turned fully clockwise). Allow the unit to
operate for 10 minutes enabling the entire unit to reach
temperature and for the flame pattern to stabilize. The
flame pattern should be similar to the one shown in
Figure 14. There are several guidelines to aid in
determining if the flame pattern is correct:
1) The flame should not be dirty, smokey, sooty, or lick
the top of the stove.
2) The flame should not raise off of the burner tube,
called “lifting”. Flames should not impinge heavily
on log set, they should “fit” through the pre-formed
spaces designed in the log set.
DAILY OPERATION
The Killington gas-fired heater is easily operated by the
homeowner once installed and adjusted by a qualified
service technician. The unit can be controlled
automatically, with a thermostat, or manually. The unit
is controlled manually by setting the
“ON/OFF/THERMOSTAT” switch (upper switch) in the
“ON” position. The main burner will stay on constantly.
In the “OFF” position, only the pilot remains lit but the
main burners and thermostat will not operate. If you
want the unit to be controlled automatically via the wall-
mounted thermostat, set the switch to
“THERMOSTAT”. By setting the thermostat to the
desired room temperature, the unit will cycle on and off
as requested by the room thermostat or remote, available
through your HearthStone dealer. 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 you
can select the optimum flame size for your setting and
application. During the summer, non-heating season,
switch the wall thermostat and rocker switches to “OFF”,
and turn off the pilot. This will improve the overall
efficiency of the unit as the heat from the pilot is not
wanted in the summer. When putting the unit back into
service follow the Lighting the Unit portion in the How
To Turn the Unit On & Off section of this manual.
When the unit is first lit, especially when cool, it is
normal to experience some condensation on the inside of
the glass window. This condensation will burn off
within the first few minutes of operation. If continuous

OWNER’S MANUAL Model# 8870 Killington
17
condensation or water drips are noted from any part of
the unit, immediately discontinue operation of the unit
and contact a qualified service technician.
MAINTENANCE AND CARE
The Killington requires minimal routine maintenance
and care. The unit should always be cool and off when
being cleaned.
WARNING: Do not substitute Materials
For replacement parts, or for information about parts or
service, contact your local HearthStone dealer.
NOTE: Label all wires prior to disconnecting when
servicing controls. Wiring errors can cause improper
and dangerous operation. Verify proper operation after
servicing.
Replacing The Glass
1. Remove the cast front by lifting and pulling away
from the unit. Carefully set aside.
2. Pull the 4 retaining clips up.
3. Pull the top of the glass and the frame out and up.
4. Drill out the rivets that hold the glass to the frame.
5. Pull the glass apart from the frame.
6. Tape the new glass with new ¾ inch tape.
(available through your HearthStone dealer)
7. Reattach the glass to the frame using 1/8”x1/8”
rivets.
8. Install frame per the instructions on page 13
Cleaning
WARNING: DO NOT CLEAN THE UNIT WHEN
HOT! The unit should receive regular cleaning on,
under, and around the stove to prevent the buildup of
dust and lint. The exterior surfaces of the unit can be
cleaned using soap, water, and a soft cloth. Do not use
abrasive or chemical cleaners and take care not to
scratch the glass or enamel finish (if so equipped) when
cleaning the unit.
Firebox
The firebox should receive periodic cleaning to prevent
the accumulation of dust, lint, and other debris. To clean
the firebox, set the valve to the “OFF” position, and turn
off the gas at the gas control valve. When the unit is
cool, remove the front and carefully remove the
decorative ceramic fiber log set (after it has cooled),
taking care not to damage the log or chip the enamel cast
iron. Clean the firebox, burner tube, pilot assembly, 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 and the pilot assembly.
Pilot & Burner Flames
Check and clean any burner ports which were not
burning properly or at all. Clean burner ports using a
soft brush or vacuum cleaner. If the pilot flame height
needs adjustment it should be adjusted by a qualified
service technician as described in the Initial Adjustments
section of this manual.
Complete the cleaning procedure by carefully placing
the log set within the firebox as described in the Log Set
Information section of this manual. Close and fasten the
front. Turn on the gas, light the unit and check for proper
operation. Flame patterns should look like the one
pictured in Figure 14, on page 17. Regularly check to
insure the area around the Killington 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. Once a
year the unit should be inspected by a qualified
service technician to ensure that it is clean, free of
obstruction, safe, and in good working order. If
service or maintenance is required, it should be
performed by a qualified service technician.
Cleaning the Glass
If operating on propane, it may be necessary to clean the
inside of the glass after break-in and occasionally. Do
not use abrasive cleaners, steel wool, or a razor blade.
Figure 14: Flame Pattern

OWNER’S MANUAL Model# 8870 Killington
18
Scratching the glass will weaken the integrity. Your
dealer will usually stock a gas fireplace glass cleaner or
a window cleaning fluid will work adequately. Do not
clean when hot!!
WARNING: Do not operate this appliance with the
glass panel removed, cracked or broken. Contact your
authorized dealer for replacement glass.
For replacement parts, or for information about parts or
service, contact your local HearthStone dealer. For the
name of the dealer nearest to you, contact:
HearthStone
317 Stafford Ave.
Morrisville, Vermont 05661
E-Mail: [e-mail]
3"MIN.
Cap
Nipple
ToEquipment
Inlet Tee Fitti ng
Gas Supply
Inlet
Sediment Trap

OWNER’S MANUAL Model# 8870 Killington
19
PARTS LIST
Cast Steel cont.
Bottom Grill 2810-280 Glass Frame 5870-090
Frame 2810-300 Glass Retainer Clip 5870-092
Left Door 2810-340 Glass Clip 5870-095
Right Door 2810-360 Surround Bracket 5870-100
Top Grill 2810-400 Modesty Panel 5870-110
Small Surround Top 2810-776 Ember Screen 5870-120
Small Surround Right Side 2810-774 Grill Clip 5870-130
Small Surround Left Side 2810-772 Hinge Clip 5870-140
Large Surround Top 2810-786 Surround Clip 5870-150
Large Surround Right Side 2810-784
Large Surround Left Side 2810-782 Miscellaneous
Andiron 2421-341 Owner's Manual
6400-40439
Heat Exchanger 2810-824 On/Off/Stat Switch 7000-200
Heat Exchanger Base 2810-825 Main Burner Orifice #46
(NG) 7200-131
Ignitor 7210-103
Steel Gas Supply Tube 3/8" x 24" 7211-016
Pilot Shield 5300-085 Main Burner Manifold 7211-052
Baffle 5800-080 Left Burner Tube 7211-235
On/Off/Stat Switch Bracket 5800-200 Right Burner Tube 7211-236
Air Shutter Indicator 5800-210 Valve (NG) 7211-300
Air Shutter Arm 5800-230 Thermostat Remote Assy 90-56914
Air Shutter 5800-240 4 Way Pilot Assembly (NG) 7211-372
Shutter Packing Clip 5800-250 Thermocouple 7211-470
Burner Tube Placement Clip 5800-260 Thermopile 7211-090
Firebox 5870-010 Pilot Orifice .62 mm(NG) 7211-163
Front Bottom Bracket 5870-012
Front Top Bracket 5870-016 KITS/ASSEMBLIES
Air Shutter Rod 5870-020 NG to LP Conversion Kit 98-56301
Left Bottom Grill Hinge 5870-025 Pilot Orifice 35mm (LP) 7211-136
Right Bottom Grill Hinge 5870-027 Main Burner Orifice #56 7200-125
Burner Pan 5870-030 LP to NG Conversion Kit 98-56300
Secondary Air Plenum 5870-035 Large Surround Assembly 98-5970110
Andiron Support 5870-037 Small Surround Assembly 98-5970010
Air Inlet Plenum 5870-040 Standard Remote Assy 90-56912
Air Exit Plenum 5870-050 Front Door Screen Kit 98-69700
Restrictor Plate 5870-055 Front Cast Assy 98-5170010
Left Blower Duct 5870-060 Blower Assembly 7211-942
Right Blower Duct 5870-070
Top Blower Duct 5870-080