Vermont Castings KSTDV500(N/P)TSCSB User manual

KSTDV Series Direct Vent Gas Fireplace
Installation and Operating Instructions
Model: KSTDV500(N/P)TSCSB
20306743 11/14 Rev. 1
DANGER
HOT GLASS WILL
CAUSE BURNS.
DO NOT TOUCH GLASS
UNTIL COOLED.
NEVER ALLOW CHILDREN
TO TOUCH GLASS.
A barrier designed to reduce the risk of burns from the hot
viewing glass is provided with this appliance and shall
be installed for the protection of children and
other at risk individuals.
20306543
CERTIFIED
SAFETY BARRIER
INSTALLER: Leave this manual with the appliance.
CONSUMER: Retain this manual for
future reference.
• Do not store or use gasoline or other
flammable vapors and liquids in the
vicinity of this or any other appliance.
• WHAT TO DO IF YOU SMELL GAS
– Do not try to light any appliance.
– Do not touch any electrical switch; do
not use any phone in your building.
– Leave the building immediately.
– Immediately call your gas supplier from
a neighbor's phone. Follow the gas
supplier's instructions.
– If you cannot reach your gas supplier,
call the fire department.
• Installation and service must be performed
by a qualified installer, service agency or
the gas supplier.
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 installer, service agency or the
gas supplier.
Thisappliancemaybeinstalledinanaftermarket,*
permanently located, manufactured home (USA
only) or mobile home, where not prohibited by
local codes.
This applianceis for useonly with thetype of gas
indicated on the rating plate. This appliance is
not convertible for use with other gases, unless
a certified kit is used.
* Aftermarket: Completion of sale, not for purpose of resale, from
the manufacturer.
WARNING:
FIRE OR EXPLOSION HAZARD
Failure to follow safety warnings exactly
could result in serious injury, death or
property damage.
For models purchased after 4/16/15, please see addendum.

220306743
KSTDV Series Gas Fireplace CONTENTS
Important Safety Information ......................................3
Code Approval..............................................................4
Product Features..........................................................5
High Elevations ........................................................5
Gas Pressures .........................................................5
Gas Specifications & Orifice Sizes...........................5
Fireplace & Framing Dimensions................................6
Pre-Installation Information.........................................7
Before You Start.......................................................7
Fireplace Framing ....................................................7
Fireplace Location....................................................8
Clearances ....................................................................9
Clearances to combustibles.....................................9
Mantel clearances....................................................9
Fireplace Installation..................................................10
Secure Fireplace to Floor or Framing ....................10
Finishing Material...................................................10
Venting Installation.....................................................11
Installation Precautions..........................................11
Installation Planning...............................................12
For Horizontal Termination.....................................12
For Vertical Termination .........................................12
Installing a Vent System in an Outside Chase .......12
Termination Location..............................................13
Termination Clearances .........................................14
How to Use the Vent Graph ...................................14
Vertical Sidewall Installation...................................15
Vertical/Horizontal Termination Configurations ......16
Below Grade Installation ........................................17
Vertical Through-the-Roof Applications..................18
Installation for Vertical Termination ........................19
Flat Ceiling Installation...........................................19
Termination height for Vents Above Flat or
Sloped Roofs ....................................................20
Gas Pipe Installation..................................................21
Check Gas Type.....................................................21
Installation Items Needed ......................................21
Install Gas Supply Line ..........................................22
Checking Gas Pressure and Electrical Installation 23
Check Gas Pressure..............................................23
Electrical Wiring .....................................................23
Junction Box Wiring ...............................................24
Command Center Wall Installation.........................24
Wall Switch Installation ..........................................24
Signature Command Wiring Diagram ....................25
Optional Fan/Blower Systems ..................................26
BLOTKSTSC Signature Command Blower............26
Final Installation.........................................................27
Glass Frame Removal ...........................................27
Light & Brick Installation.........................................27
Rock Wool Placement............................................28
Log Placement .......................................................29
Safety Barrier Installation Instructions ...................31
Operating Instructions...............................................32
Read Before Lighting .............................................32
Operating Instructions............................................33
To Turn Off Gas......................................................33
Signature Command System Operation
Instructions ..........................................................34
Features.................................................................34
Battery Installation .................................................34
System Configuration/Setup ..................................34
Cold Climate Option...............................................34
Key Combinations for System Settings..................35
Functions/Operation...............................................36
Command Center Operations ................................36
Self Diagnostics Chart ...........................................36
Touch Screen Remote Transmitter Operation.........37
Function Areas of LCD Display ..............................37
Initialization and Set Up .........................................37
Functions and Operations......................................39
Safety Featuress....................................................41
Using the Mounting Base.......................................42
Cleaning and Maintenance........................................43
Burner, Pilot and Control Compartment .................43
Pilot Flame .............................................................43
Burner Flame .........................................................43
Vent System...........................................................44
Glass Door .............................................................44
Logs .......................................................................44
Rock Wool .............................................................44
Troubleshooting .........................................................45
Signature Command System .................................45
Replacement Parts.....................................................46
Firebox Components and Accessories ..................46
Signature Command System Components............47
Logs .......................................................................49
Accessories............................................................50
Vent Components ..................................................51
Massachusetts Residents Only.................................54
Warranty......................................................................55
Efficiencies..................................................................56
Thank you and congratulations on your purchase of a Vermont Castings Group Fireplace!
PLEASE READ THE INSTALLATION AND OPERATION INSTRUCTIONS BEFORE USING THE APPLIANCE!
IMPORTANT: Read all instructions and warnings carefully before starting installation.
Failure to follow these instructions may result in a possible fire hazard and will void the warranty.

20306743 3
KSTDV Series Gas Fireplace
4. Never install the fireplace
• in a recreational vehicle
• where curtains, furniture, clothing, or other flam-
mable objects are less than 42" from the front, top,
or sides of the fireplace
• in high traffic areas
• in windy or drafty areas
5. This fireplace reaches high temperatures. Keep chil-
dren and adults away from hot surfaces to avoid burns
or clothing ignition. Fireplace will remain hot for a time
after shutdown. Allow surfaces to cool before touching.
6. Carefully supervise young children when they are in
the room with fireplace.
7. Do not modify fireplace under any circumstances. Any
parts removed for servicing must be replaced prior to
operating fireplace.
8. Turn fireplace off and let cool before servicing, install-
ing, or repairing. Only a qualified service person should
install, service, or repair the fireplace. Have burner
system inspected annually by a qualified service
person.
9. You must keep control compartments, burners, and
circulating air passages clean. More frequent cleaning
may be needed due to excessive lint and dust. Turn off
the gas valve and pilot light before cleaning fireplace.
10. Have venting system inspected annually by a quali-
fied service person. If needed, have venting system
cleaned or repaired. Refer to Cleaning and Mainte-
nance,.
11. Keep the area around your fireplace clear of combus-
tible materials, gasoline, and other flammable vapor
and liquids. Do not run fireplace where these are used
or stored. Do not place items such as clothing or dec-
orations on or around fireplace.
12. Do not use this fireplace to cook food or burn paper or
other objects.
13. Never place anything on top of fireplace.
14. Do not use any solid fuels (wood, coal, paper, card-
board, etc.) in this fireplace. Use only the gas type
indicated on rating plate.
INSTALLER
Please leave these instructions with the appliance.
OWNER
Please retain these instructions for future reference .
IMPORTANT SAFETY INFORMATION
This fireplace is a vented product. This fireplace must be
properly installed by a qualified service person. The glass
door must be properly seated and sealed. If this unit is not
properly installed by a qualified service person with glass
door properly seated and sealed, combustion leakage
can occur.
CARBON MONOXIDE POISONING: Early signs of carbon
monoxide poisoning are similar to the flu with headaches,
dizziness and/or nausea. If you have these signs, the fire-
place may not have been installed properly. Get fresh air
at once! Have the fireplace inspected and serviced by a
qualified service person. Some people are more affected
by carbon monoxide than others. These include pregnant
women, people with heart or lung disease or anemia, those
under the influence of alcohol, and those at high altitudes.
Propane/LP gas and natural gas are both odorless. An
odor-making agent is added to each of these gases. The
odor helps you detect a gas leak. However, the odor added
to these gases can fade. Gas may be present even though
no odor exists.
Make certain you read and understand all warnings. Keep
this manual for reference. It is your guide to safe and proper
operation of this fireplace.
1. 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 certified
kit is used.
2. For propane/LP fireplace, do not place propane/LP
supply tank(s) inside any structure. Locate propane/
LP supply tank(s) outdoors. To prevent performance
problems, do not use propane/LP fuel tank of less than
100 lbs. capacity.
3. If you smell gas
•shut off gas supply.
•do not try to light any appliance.
• do not touch any electrical switch; do not use any
phone in your building .
• immediately call your gas supplier from a neigh-
bor’s phone. Follow the gas supplier’s instructions.
WARNING
• Read this owner’s manual carefully and completely before trying to assemble, operate, or service this
fireplace.
• Any change to this fireplace or its controls can be dangerous.
• Improperinstallation oruse of thisfireplacecan causeserious injury ordeath fromfire, burns,explosions,
electrical shock and carbon monoxide poisoning.

420306743
KSTDV Series Gas Fireplace IMPORTANT SAFETY INFORMATION & CODE APPROVAL
15. This appliance, when installed, must be electrically
grounded in accordance with local codes or in the
absence of local codes, with the National Electrical
Code,ANSI/NFPA70, or the CanadianElectrical Code,
CSA C22.1.
16. Do not obstruct the flow of combustion and ventilation
air in any way. Provide adequate clearances around
air openings into the combustion chamber along with
adequate accessibility clearance for servicing and
proper operation.
17. When the appliance is installed directly on carpeting,
tile or other combustible material other than wood
flooring, you must set appliance on a metal or wood
panel or hearth pad extending the full width and depth
of the appliance.
18. Do not use fireplace if any part has been exposed to
or has been under water. Immediately call a qualified
service technician to inspect the appliance and replace
any part of the control system and any gas control
which as been submerged in water.
19. Do not operate fireplace if any log is broken.
20. Do not use a blower insert, heat exchanger insert, or
any other accessory not approved for use with this
fireplace.
21. Do not operate the fireplace with glass door removed,
cracked, or broken.
CODE APPROVAL
Direct Vent type appliances draw all combustion air from
outside of the dwelling through the vent pipe.
These appliances have been tested by CSA and found to
comply with the established standards for DIRECT VENT
GAS FIREPLACE HEATERS in the USA and Canada as
follows:
LISTED VENTED GAS FIREPLACE HEATER
TESTED TO: ANSI Z21.88-2014 / CSA 2.33-2014
STANDARDS
A manufactured home (USA only) or mobile home OEM
installation must conform with the Manufactured Home
Construction and Safety Standard, Title 24 CFR, Part
3280, or when such a standard is not applicable, the
Standard for Manufactured Home Installations, ANSI/
NCSBCS A225.1, or Standard for Gas Equipped Rec-
reational Vehicles and Mobile Housing, CSA Z240.4.
WARNING
Never connect unit to private (non-utility)
gas wells. This gas is commonly known
as wellhead gas.
IMPORTANT:
PLEASE READ THE FOLLOWING
CAREFULLY
It is normal for fireplaces fabricated of steel
to give off some expansion and/or contraction
noises during the start up or cool down cycle.
Similar noises are found with your furnace heat
exchanger or car engine.
IMPORTANT:
PLEASE READ THE FOLLOWING
CAREFULLY
It is not unusual for gas fireplace to give off
some odor the first time it is burned. This is due
to the manufacturing process.
Please ensure that your room is well
ventilated during burn off — open all
windows.
It is recommended that you burn your fireplace
for at least ten (10) hours the first time you use
it. Place the fan switch in the “OFF” position
during this time.

20306743 5
KSTDV Series Gas Fireplace
PRODUCT FEATURES
PRODUCT SPECIFICATIONS
•This appliance has been certified for use with either
natural or propane gas. See appropriate data plates.
•This appliance is not for use with solid fuels.
•The appliance is approved for bedroom or bedsitting
room installations.
•The appliance must be installed in accordance with local
codes if any. If none exist use the current installation
code. ANSI Z223.1/NFPA 54 in the USA, CSA B149 in
Canada.
•This appliance is mobile home approved.
•The appliance must be properly connected to a venting
system.
•The appliance is not approved for closet or recessed
installations.
GAS PRESSURES
HIGH ELEVATIONS
Input ratings are shown in BTU per hour and are certified
without deration for elevations up to 4,500 feet (1,370
m) above sea level.
For elevations above 4,500 feet (1,370 m) in USA,
installations must be in accordance with the current ANSI
Z223.1/NFPA 54 and/or local codes having jurisdiction.
In Canada, please consult provincial and/or local author-
ities having jurisdiction for installations at elevations
above 4,500 feet (1,370 m).
Natural Propane (LP)
Inlet Minimum 4.5" w.c. 11.0" w.c.
Inlet Maximum 10.5" w.c. 13.0" w.c.
Manifold Pressure 3.5" w.c. 10.0" w.c.
GAS SPECIFICATIONS & ORIFICE SIZE
Model Fuel Orifice Size Front (2) Middle
KSTDV500 Nat. #46 #29
KSTDV500 LP #56 #50
Figure 1 -
KSTDV Controls
Control Box
Gas Valve
Command
Center
Model Fuel
BTU/HR Input
Max. All
Burners Min. All Burners
Front
Burners
Only
KSTDV500 Nat. 56,000 37,000 30,000
KSTDV500 LP 56,000 44,000 27,000

FIREPLACE & FRAMING DIMENSIONS
620306743
KSTDV Series Gas Fireplace
Rough
Opening
Height
1/2” or 5/8”
Recessed
Nailing Flange
50” (1270 mm)
Rough Opening Width
Rough
Opening
Depth
36” (914 mm)
396” (1007 mm)
446M”
(1137 mm)
456M”
(108 mm)
4456O”
(1130 mm)
386”
(981 mm)
23”
(584 mm)
24”
(610 mm)
4956O” (1257 mm)
30"
(762 mm)
25”
(635 mm)
1156O”
(292 mm)
Figure 2 -
Fireplace and Framing Dimensions
NOTE: For exterior wall applications, outdoor facing kit KST500SSDK is required. In these installations, the control-side
of the unit MUST face towards the interior of the building.

20306743 7
KSTDV Series Gas Fireplace
PRE-INSTALLATION INFORMATION
BEFORE YOU START
Read this homeowner manual thoroughly and follow all
instructions carefully. Inspect all contents for shipping
damage and immediately inform your dealer if any damage
is found. Do not install any unit with damaged, incomplete,
or substitute parts. Check your packing list to verify that
all listed parts have been received. You should have the
following:
•Fireplace (Firebox and Burner System)
•Log Set • Fasteners
• Rock Wool • Restrictor Plate/Disc (2)
• White Toggle Switch • Switch Cover Plate
ITEMS REQUIRED FOR INSTALLATION
• Phillips Screwdriver • Framing Materials
• Hammer • Wall Finishing Materials
• Saw and/or saber saw • Level
• Measuring Tape • Pliers
• Electric Drill and Bits • Square
• Pipe Wrench • Tee Joint
• Noncombustible Panel
• Caulking Material (noncombustible)
• Fireplace Surround Material (noncombustible)
• Piping Complying with Local Codes
• Pipe Sealant Approved for use with Propane/LPG
(Resistant to sulfur compounds)
WARNING
Do not fill spaces around firebox with
insulation or other materials. This could
cause a fire.
FIREBOX FRAMING
Firebox framing can be built before or after the appliance
is set in place. Construct firebox framing following Figure
2for your specific installation requirements. The framing
headers may rest on the top of the firebox standoffs. Do
not bring headers below top of standoffs. NOTE: When
planning your framing and installation, keep in mind that
your gas line will come in on the right side of the box (as
you are facing it) and your electricity will come in on the
left side.
The firebox may be installed directly on a combustible floor
or raised on a platform of an appropriate height. When
the firebox is installed directly on carpeting, tile, or other
combustible material, other than wood flooring, the firebox
shall be installed on a metal or wood panel extending the
full width and depth of the enclosure.
COLD CLIMATE INSULATION
If you live in a cold climate, seal all cracks
around yourappliance, andwherever cold air
could enter the room, with noncombustible
material. It isespecially important to insulate
the outside chase cavity between the studs
and under the floor on which the appliance
rests, if the floor is above ground level.
NOTE
NOTE: Refer to cold climate pilot information on Page 43
for more information on standing pilot vs. intermittent pilot
options.

820306743
KSTDV Series Gas Fireplace PRE-INSTALLATION INFORMATION
FIREPLACE LOCATION
Plan for the installation of your appliance. This includes
determining where the unit is to be installed, the vent
configuration to be used, framing and finishing details,
and whether any optional accessories (i.e. blower, wall
switch, or remote control) are desired. Consult your local
building code agency to ensure compliance with local
codes, including permits and inspections.
The following factors should be taken into consideration:
•Clearance to side-wall, ceiling, woodwork, and windows.
Minimum clearances to combustibles must be main-
tained.
•This fireplace may be installed along a wall, across a
corner, or use an exterior chase. Refer to Figure 3 for
suggested locations.
•Location should be out of high traffic areas and away
from furniture and draperies due to heat from appliance.
•Never obstruct the front opening of the fireplace.
•Do not install in the vicinity where gasoline or other
flammable liquids may be stored.
Y
DA
B
C
E
Y
X
** Island (C) and Room Divider (D) installation is possible as long as the horizontal portion of the vent system (X) does not exceed
20’ (610cm). See details in Venting Section.
* When you install your fireplace in (D) Room divider or (E) Flat on wall corner positions (Y), a minimum of 6” (152mm) clearance
must be maintained from the perpendicular wall and the front side edge of the fireplace.
A Flat on wall
B **Island
C *Room divider
D *Flat on wall corner
E Chase installation
Y 6” minimum
Figure 3 -
Locate Fireplace
NOTE: For exterior wall applications, outdoor facing kit
KST500SSDK is required. In these installations, the con-
trol-side of the unit MUST face towards the interior of the
building.
•Vent pipe routing. See Venting section found in this
manual for allowable venting configurations.
•These units can be installed in a bedroom. See National
Fuel Gas Code ANSI Z233.1/NFPA 54 — (current
edition), the Uniform Mechanical Code — (current edi-
tion), and Local Building Codes for specific installation
requirements.
•These units can be installed in a bathroom.

20306743 9
KSTDV Series Gas Fireplace
CLEARANCES
CLEARANCES TO COMBUSTIBLES
MANTEL CLEARANCES
NOTE: The combustible area above the facing must
not protrude more than 1/2" from the facing. If it does,
it is considered a mantel and must meet the mantel
requirements listed in this manual.
Figure 4 -
Ceiling and Side Wall Clearances
72”
(1829 mm)
Min.
Ceiling
12”
(305 mm)
Max. Depth
16”
(406 mm)
Min.
6”
(
152 mm)
Min.
Hearth 8” Min.
(203 mm)
Noncombustible
Hearth Minimum
Fireplace Opening
Combustible Mantel
45°
1”
4”
5” 6”
”3”
Figure 5 -
Mantel Clearance
Stud
Finish Wall
Combustible
Material Area
Top View
Follow these instructions carefully to
ensure safe installation. Failure to follow
instructions exactly can create a fire hazard.
The appliance cannot be installed on a
carpet, tile or other combustible material
other than wood flooring. If installed on
carpet or vinyl flooring, the appliance
shall be installed on a metal, wood or
noncombustible material panel extending
full width and depth of the appliance.
WARNING
16”
12”
10”
12”
6”
256O”
Side View
Noncombustible
Material to Top of
Standoffs
CFM146d
Top of Fireplace
Opening
Never obstruct or modify the air inlet or
outlet grilles (louvers). This may create
a fire hazard.
WARNING

10 20306743
KSTDV Series Gas Fireplace FIREPLACE INSTALLATION
FINISHING MATERIAL
NOTE:Any remote wiring (i.e. remote control, wall switch,
and optional fan) must be done prior to final finishing to
avoid costly reconstruction.
Only noncombustible materials (i.e. brick, tile, slate, steel,
or other materials with a UL fire rating of Zero) may be
used to cover the black surface of the appliance. A 300°F
minimum adhesive may be used to attach facing materials
to the black surface. If joints between the finished wall
and the fireplace surround are sealed, a 300°F minimum
sealant material (General Electric RTV103 or equivalent)
must be used.
NOTE
Never install combustible materials over
front face of fireplace.
Figure 6 -
Secure Fireplace to Floor and Framing Studs
Nailing Flange
Screws
Framing
FP2545
Noncombustible
Material
SECURE FIREPLACE TO FLOOR OR FRAM-
ING
The fireplace must be secured to the floor and/or to framing
studs as shown in Figure 6 . Use four (4) wood screws or
masonry/ concrete screws to secure fireplace to the floor.
Use four (4) screws to attach fireplace to framing. The side
brackets or nailing flanges are designed to accommodate
two wall boards thicknesses, 1/2" or 5/8".
A 6" area above fireplace must be a
noncombustible material. Figure 6
NOTE

20306743 11
KSTDV Series Gas Fireplace
VENTING INSTALLATION
INSTALLATION PRECAUTIONS
Consult local building codes before beginning the
installation. The installer must make sure to select the
proper vent system for installation. Before installing vent
kit, the installer must read this fireplace manual and vent
kit instructions.
Only a qualified installer/service person should install the
venting system. The installer must follow these safety rules:
•Wear gloves and safety glasses for protection.
•Use extreme caution when using ladders or when on
rooftops.
•Be aware of electrical wiring locations in walls and
ceilings.
The following actions will void the warranty on your venting
system:
•Installation of any damaged venting component.
•Unauthorized modification of the venting system.
•Installation of any component part not manufactured or
approved by Vermont Castings Group
•Installation other than permitted by these instructions.
This fireplace must be vented to the outside.
The ventingsystem mustNEVER beattached
to a chimney serving a separate solid fuel
burning appliance. Each gas appliance must
use a separate vent system. Do not use
common vent systems.
WARNING
Read all instructions completely and
thoroughly before attempting installation.
Failure to do so could result in serious
injury, property damage or loss of life.
Operation of improperly installed and
maintained venting system could result in
serious injury, property damage or loss of
life.
WARNING
Failure to follow these instructions will
void the warranty.
NOTICE
*3”
**1”
**1”
24”
(610 mm)
72”
(1829 mm)
Figure 7 -
Combustible Clearances for Vent Pipe
* A minimum of 3" clearance to the top is required along
horizontal length until flue pipe penetrates outside wall.
** A minimum 1" clearance to combustibles permitted all
around flue at outside wall
FP2567
WARNING
Horizontal sections of this vent system
require a minimum of 3" clearances to
combustibles at the top of the flue and 1"
clearance at the sides and bottom until the
flue penetrates the outside wall. Aminimum
1"clearanceall around theflueis acceptable
at this point of penetration. Unless the
vertical run is 71⁄2feet or higher from floor
of fireplace, the clearance for horizontal run
is 1" on all sides.
Vertical sections of this vent system require
a minimum of 2" clearance to combustibles
at the top of the unit directly above the
stand-off. A minimum of 1" clearance all
around the flue is acceptable thereafter.
For models purchased after 4/16/15, please see addendum.

12 20306743
KSTDV Series Gas Fireplace VENTING INSTALLATION
INSTALLATION PLANNING
There are two basic types of direct-vent installation:
•Horizontal Termination
•Vertical Termination
It is important to select the proper length of vent pipe for
the type of termination you choose. It is also important to
note the wall thickness.
FOR HORIZONTAL TERMINATION
Select the amount of vertical rise desired. All horizontal run
of venting must have 1/4" rise for every 12" of run towards
the termination below 71⁄2" of vertical rise from floor of fire-
place. With 71⁄2feet or more of vertical rise from the floor
of the fireplace, the horizontal run may be level. NEVER
run vent piping down.
You may use up to three 90° elbows in this vent configura-
tion. Refer to Vertical/Horizontal Termination Configurations
on Page 16.
FOR VERTICAL TERMINATION
Measure the distance from the fireplace floor to the ceil-
ing. Add the ceiling thickness, the vertical rise in an attic
or second story, and allow for sufficient vent height above
the roof line.
NOTE: You may use two 45° elbows in place of a 90°
elbow. You must follow rise to run ratios when using
45° elbows. The appliance is approved for use with
three 90° elbows maximum or a combination of 90°
and 45° elbows up to a maximum of 270°.
For two-story applications, firestops are required at each
floor level. If an offset is needed in the attic, additional pipe
and elbows will be required.
NOTICE
When installing in a chase, you should
insulate the chase as you would the outside
walls of your home. This is especially
important in cold climates. Insulation
should be considered a combustible
material. Maintain proper clearances to all
combustible materials.
WARNING
Always maintain minimum clearances
around vent systems. The minimum
clearances to combustibles for horizontal
vent pipe are 3" at the top* and 1" at the
sides and bottom of the vent system until
the pipe penetrates the nearest vertical
wall (1" required). A 1" minimum clearance
all around the pipe must be maintained at
outside wall and on vertical runs. Do not
pack the open air spaces with insulation
or other materials. This could cause high
temperatures and may present a fire hazard.
*Unless the vertical run is 71⁄2feet or higher
from floor of fireplace, the clearance for the
horizontal run is 1" on all sides.
Treatment of firestops and construction of
the chase may vary from building type to
building type. These instructions are not
substitutes for the requirements of local
building codes. You must follow all local
building codes.
NOTICE
Never run the vent pipe down. This may
cause excessive temperatures which could
cause a fire.
WARNING
You may use a chase with a vent termination with exposed
pipe on the exterior of the house. See Installing Vent
System in a Chase below. If pipe is enclosed in chase, it
is not exposed.
It is very important that the venting system maintain its
balance between the combustion air intake and the flue
gas exhaust. Certain limitations apply to vent configurations
and must be strictly followed.
INSTALLING A VENT SYSTEM IN AN
OUTSIDE CHASE
A chase is a vertical boxlike structure built to enclose
venting that runs along the outside of a building. A chase
is required for such venting.
For models purchased after 4/16/15, please see addendum.

20306743 13
KSTDV Series Gas Fireplace
VENTING INSTALLATION
V
X
X
X
D
E
B
B
B
C
B
M
B
A
J K
F
L
VENT TERMINATION AIR SUPPLY INLET AREA WHERE TERMINAL IS NOT PERMITTED
H
I
Fixed
Closed
Operable
Operable Fixed
Closed
B
INSIDE
CORNER DETAIL
A
G
CFM145a
V
V
V
VV
VV
V
TERMINATION LOCATION
1 In accordance with the current CSA-B149 Installation Codes
2 In accordance with the current ANSI Z223.1/NFPA 54 National Fuel
Gas Codes
† A vent shall not terminate directly above a sidewalk or paved
driveway which is located between two single family dwellings and
serves both dwellings
‡ Only permitted if veranda, porch, deck or balcony is fully open on a
minimum 2 sides beneath the floor.
NOTE: 1. Local codes or regulations may require different
clearances.
2. The special venting system used on Direct Vent
Fireplaces are certified as part of the appliance, with
clearances tested and approved by the listing agency.
3. Vermont Castings Group assumes no responsibility for
the improper performance of the appliance when the venting
system does not meet these requirements.
Figure 8 –
Termination Locations
CANADIAN INSTALLATIONS1US INSTALLATIONS2
A = Clearance above grade, veranda, porch,
deck or balcony
12" (30cm) 12" (30cm)
B = Clearance to window or door that may be
opened
6" (15cm) for appliances <10,000 BTU/h
(3kW)
12" (30cm) for appliances >10,000 BTU/h
(3kW) and <100,000 BTU/h (30kW)
36" (91cm) for appliances >100,000 BTU/h
(30kW)
6" (15cm) for appliances <10,000 BTU/h
(3kW)
9" (23cm) for appliances >10,000 BTU/h
(3kW) and <50,000 BTU/h (15kW)
12" (30cm) for appliances >50,000 BTU/h
(15kW)
C = Clearance to permanently closed window 12" (305mm) recommended to prevent
window condensation
12" (305mm) recommended to prevent
window condensation
D = Vertical clearance to ventilated soffit
located above the terminal within a hor-
izontal distance of 2' (610 mm) from the
center line of the terminal
18" (458mm) 18" (458mm)
E = Clearance to unventilated soffit 12" (305mm) 12" (305mm)
F = Clearance to outside corner see next page see next page
G = Clearance to inside corner see next page see next page
H = Clearance to each inside of center line
extended above meter/regulator assembly
3' (91cm) within a height of 15' (5m) above
the meter/regulator assembly
3' (91cm) within a height of 15' (5m) above
the meter/regulator assembly
I = Clearance to service regulator vent outlet 3' (91cm) 3' (91cm)
J = Clearance to non-mechanical air supply
inlet to building or the combustion air inlet
to any other appliance
6" (15cm) for appliances <10,000 BTU/h
(3kW)
12" (30cm) for appliances >10,000 BTU/h
(3kW) and <100,000 BTU/h (30kW)
36" (91cm) for appliances >100,000 BTU/h
(30kW)
6" (15cm) for appliances <10,000 BTU/h
(3kW)
9" (23cm) for appliances >10,000 BTU/h
(3kW) and <50,000 BTU/h (15kW)
12" (30cm) for appliances >50,000 BTU/h
(15kW)
K = Clearance to mechanical air supply inlet 6' (1.83m) 3' (91cm) above if within 10' (3m) horizontally
L = Clearance above paved sidewalk or
paved driveway located on public property
7' (2.13m)†7' (2.13m)†
M = Clearance under veranda, porch, deck or
balcony
12" (30cm)‡12" (30cm)‡
For models purchased after 4/16/15, please see addendum.

14 20306743
KSTDV Series Gas Fireplace VENTING INSTALLATION
HOW TO USE THE VENT GRAPH
The Vent Graph should be read in conjunction with the
following vent installation instructions to determine the
relationship between the vertical and horizontal dimensions
of the vent system.
1. Determine the height of the center of the horizontal vent
pipe exiting through the outer wall. Using this dimension
on the Sidewall Vent Graph below, locate the point
intersecting with the slanted graph line.
2. From the point of this intersection, draw a vertical line
to the bottom of the graph.
3. Select the indicated dimension, and position the fire-
place in accordance with same.
Example: If the vertical dimension from the floor of the
fireplace is 11' (3.4 m) the horizontal run to the face of
the outer wall must not exceed 16' (4.9 m).
Sidewall Vent Graph showing the relationship between
vertical and horizontal dimensions for a Direct Vent flue
system. Figure 10 -
Rear Wall Venting Graph (No Horizontal Elbows)
40
38
36
34
32
30
28
26
24
22
20
18
16
14
12
10
8
6
4
2
2 4 6 8 10121416 1820
eg: A
Dimensions in Feet
Horizontal dimension from the finished outside wall to the
center of the pipe on the fireplace
Vertical Dimension From the Floor of Unit to the
Center of the Horizontal Vent Pipe
*NOTE: Termination in an alcove space (spaces open only on one side
and with an overhang) is permitted with the dimensions specified for
vinyl or non-vinyl siding and soffits. 1. There must be a 3' (914 mm) min-
imum between termination caps. 2. All mechanical air intakes within 10'
(1 m) of a termination cap must be a minimum of 3' (914 mm) below the
termination cap. 3. All gravity air intakes within 3' (914 mm) of a termina-
tion cap must be a minimum of 1' (305 mm) below the termination cap.
TERMINATION CLEARANCES
Termination clearances for buildings with combustible and non-combustible exteriors.
Outside Corner
Inside Corner
G =
Combustible
6" (152 mm)
Noncombustible
2" (51 mm)
F =
Combustible
6" (152 mm)
Noncombustible
2" (51 mm)
G
Balcony -
with no side wall
M =
Combustible &
Noncombustible
12" (305 mm)
M
Balcony -
with perpendicular side wall
M = 12" (305 mm)
P = 6” (152 mm)
M
F
Alcove Applications*
C D C
E
V
V
Combustible &
Noncombustible
E= Min. 2” (51 mm) for
non-vinyl sidewalls
Min. 12” (305 mm) for
vinyl sidewalls
O= 8’ (2.4 m) Min.
O
P
V
V
V
DMin. = Number of Termination caps x 3
CMax. = (2 / Number termination caps) x DActual
No. of
Caps DMIN.CMAX.
1 3' (914 mm) 2 x DACTUAL
2 6' (1.8 m) 1 x DACTUAL
3 9' (2.7 m) 2/3 x DACTUAL
4 12' (3.7 m) 1/2 x DACTUAL
For models purchased after 4/16/15, please see addendum.

20306743 15
KSTDV Series Gas Fireplace
VENTING INSTALLATION
VERTICAL SIDEWALL INSTALLATION
NOTE: Sealant is not required to assemble fireplace
venting. Do not use silicone sealant at the inner flue
exhaust connections.
Step 1
Locate vent opening on the wall. It may be necessary to
first position the fireplace and measure to obtain hole lo-
cation. Depending on whether the wall is combustible or
noncombustible, cut opening to size. Figure 11 (For com-
bustible walls first frame in opening.)
Combustible Walls: Cut a 101⁄2”H x 101⁄2”W (267 x 267
mm) hole through the exterior wall and frame as shown.
Figure 11
Noncombustible Walls: Hole opening must be 81⁄2” (216
mm) in diameter.
Vent Opening for Combustible Walls
101⁄2”
(267 mm)
Min.
Fireplace Hearth Framing Detail
Opening for Noncombustible Wall
81⁄2"
(216 mm)
Fireplace Hearth
Figure 11 -
Locate vent opening on wall
101⁄2"
(267 mm) Min.
Step 2
Secure firestop to the inside frame, center in the 101⁄2" x
101⁄2" vent opening.
Step 3
Place fireplace into position. Measure the vertical height
(X) required from the base of the flue collars to the center
of the wall opening. Figure 12
Step 4
Using appropriate length of pipe section(s) attach to fire-
place with three (3) screws. Follow with the installation of
the elbow.
Step 5
Measure the horizontal length requirement figuring a 11⁄4”
(32 mm) overlap, i.e. from the elbow to the outside wall
cap. Figure 13
X
Figure 12 -
Vertical Height
Requirement
X
Figure 13 -
Horizontal Length
Requirement FP1385
Always install horizontal venting on a level
plane.
Step 6
Use appropriate length of pipe sections - telescopic or
fixed - and install.
Sealing vent pipe and firestop gaps with high tem-
perature sealant will restrict cold air being drawn in
around fireplace.
Step 7
Guide the vent terminations 5” and 8” collard into their
respective vent pipes. Double check that the vent pipes
overlap the collars by a minimum of 11⁄4" (32 mm). Secure
the termination to the wall with screws provided and caulk
around the wall plate to weatherproof. As an alternative to
screwing the termination directly to the wall, you may also
use expanding plugs or an approved exterior construction
adhesive.
Support horizontal pipes every 36” (914
mm) with metal pipe straps.
For models purchased after 4/16/15, please see addendum.

16 20306743
KSTDV Series Gas Fireplace VENTING INSTALLATION
VERTICAL/HORIZONTAL TERMINATION
CONFIGURATIONS
Since it is very important that the venting system
maintain its balancebetween thecombustion air intake
and the flue gas exhaust, certain limitations as to vent
configurations apply and must be strictly adhered to.
The Vent Graph, showing the relationship between vertical
and horizontal side wall venting, will help to determine the
various dimensions allowable. Figure 10
NOTE: Horizontal sections of this vent system require
a minimum of 3" clearances to combustibles at the top
of the flue and 1" clearance at the sides and bottom
until the flue penetrates the outside wall. A minimum
1" clearance all around the flue is acceptable at this
point of penetration. Unless the vertical run is 71⁄2feet
or higher from floor of fireplace, the clearance for the
horizontal run is 1" on all sides.
Vertical sections ofthis vent system requirea minimum
of 1" clearance to combustibles on all sides of the pipe.
When vent exits through foundations less than 20" below
outcrop, the termination must be flush up with outcropped
wall above.
It is best to locate the fireplace in such a way that minimizes
the number of offsets and horizontal vent length.
The horizontal vent run refers to the total length of vent
pipe from the flue collar of the fireplace (or the top of the
Transition Elbow) to the face of the finished outside wall.
•The maximum number of 90° elbows per side wall
installation is three (3). Figure 14
Figure 14 -
Maximum Three (3) 90° Elbows Per Installation
3 x 90° Elbows
24" Min.
FP1380
•If a 90° elbow is used in the horizontal vent run (level
height maintained) the horizontal vent length is reduced
by 36". Refer to Figure16.This does not apply if the 90°
elbows are used to increase or redirect a vertical rise.
Example:According to the vent graph (page 14) the max-
imum horizontal vent length in a system with a 10' vertical
rise is 171⁄2’ (5.3 m) and if a 90° elbow is required in the
horizontal vent it must be reduced to 141⁄2' (4.4 m).
In Figure 16 dimension A plus B must not be greater than
141⁄2' (4.4 m).
AB
10’
Figure 16 -
Horizontal Run Reduction
FP2546
•A minimum of 24" is required before a 90° elbow. If a 90°
elbow is fitted directly after 24" vertical section mounted
to the top of the fireplace, the horizontal vent run before
the termination must be 36” (914 mm). Figure 15
FP1381
Figure 15 -
Horizontal Run with Minimum Vertical Rise
*NOTE: With a
24" rise, the hor-
izontal run must
be 36".
24"
(610 mm)
Min.
90° Elbow = 36" (914 mm)
Reduction
For models purchased after 4/16/15, please see addendum.

20306743 17
KSTDV Series Gas Fireplace
VENTING INSTALLATION
Example: Elbow 1 = 90°
Elbow 2 = 45°
Elbow 3 = 45°
Elbow 4 = 90°
Total Angular Variation = 270°
Figure 17 -
Maximum Elbow Usage
1
2
3
4
24" (610 mm)
Minimum
FP1383
supplied). Refill hole with 12" of coarse gravel leaving
a clearance of approximately 4" below snorkel. Figure
18
3. Install vent system.
4. Ensure a watertight seal is made around the vent pipe
coming through the wall.
5. Apply high temperature sealant caulking (supplied)
around the 5" and 8" snorkel collars.
6. Slide the snorkel into the vent pipes and secure to the
wall.
7. Level the soil so as to maintain a 4" clearance below
snorkel. Figure 18
Figure 18 -
Below Grade Installation
Screws
Minimum
4" Clearance
Ground
Window
Well
Gravel
Drain
Foundation
Wall
Firestop
24"
(610 mm)
Minimum
•For each 45° elbow installed in the horizontal run, the
length of the horizontal run MUST be reduced by 18"
(457 mm). This does not apply if the 45° elbows are
installed on the vertical part of the vent system.
•The maximum number of elbow degrees in a system is
270°. Figure 17
BELOW GRADE INSTALLATIONS
When it is not possible to meet the required vent terminal
clearances of 12" above grade level, a snorkel kit is rec-
ommended. It allows installation depth down to 7" (178
mm) below grade level. The 7" (178 mm) is measured
from the center of the horizontal vent pipe as it penetrates
through the wall.
Ensure that sidewall venting clearances are observed.
If venting system is installed below ground, we recom-
mend awindow wellwith adequate and properdrainage
to be installed around the termination area.
If installing a snorkel, a minimum 24" vertical rise is neces-
sary. The maximum horizontal run with the 24” vertical pipe
is 36". This measurement is taken from the collar of the
fireplace (or transition elbow) to the face of the exterior wall.
See the Sidewall Venting Graph for extended horizontal
run if the vertical exceeds 24".
1. Establish vent hole through the wall.
2. Remove soil to a depth of approximately 16" below base
of snorkel. Install drain pipe. Install window well (not
If the foundation is recessed, use recess brackets (not
supplied) for securing lower portion of the snorkel. Fasten
brackets to wall first, then secure to snorkel with self drilling
#8 x 1/2 sheet metal screws. It will be necessary to extend
vent pipes out as far as the protruding wall face. Figure 19
Figure 19 -
Snorkel Installation, Recessed Foundation
Foundation
Recess
Watertight Seal
Around Pipe
Sheet Metal
Screws
Wall Screws
Snorkel
For models purchased after 4/16/15, please see addendum.

18 20306743
KSTDV Series Gas Fireplace
WARNING
•Do not back fill around snorkel.
•A clearance of at least 4" must be
maintained between the snorkel and
the soil.
Install restrictor disc as shown in Figure 20 for vertically
vented applications. Up to two (2) restrictor discs may be
needed for 40' installation. The two (2) restrictor discs
suppled will work for most installations. If a third disc is
needed order part number 56D3027.
VENTING INSTALLATION
VERTICAL THROUGH-THE-ROOF
APPLICATIONS
NOTICE
A restrictor disc must be installed on
vertical terminations that are higher than
12' (366 cm).
Restrictor Disc
Fireplace Collar
Figure 20 -
Install Restrictor Disc into Fireplace Collar
This gas fireplace has been approved for vertical installa-
tions up to 40' (12 m) in height. Up to a 20' (6 m) horizontal
vent run can be installed within the vent system using a
maximum of two 90° elbows. Figure 21
NOTE: Horizontal sections of this vent system require a
minimum of 3" clearances to combustibles at the top of
the flue and 1" clearance at the sides and bottom until the
flue penetrates the outside wall. A minimum 1" clearance
all around the flue is acceptable at this point of penetration.
Unless the vertical run is 71⁄2feet or higher form floor of
fireplace, the clearance for the horizontal run is 1" on all
sides.
Vertical sections of this vent system require a minimum
of 1" clearance to combustibles on all sides of the pipe.
•Up to two 45° elbows may be used within the horizontal
run. For each 45° elbow used on the horizontal plane,
the maximum horizontal length must be reduced by 18"
(457 mm).
B
A
40' (12 m) Maximum Height
12' (3.7 m) Minimum Height
Support Straps
Every 3'
FP1387a
Figure 21 -
Allowable Horizontal Runs with Vertical Rises and
Terminations
10 12 14 16 18 20
5
6
7
8
9
10
11
A: Vertical
dimension from
the floor to the
center of the
horizontal vent
pipe.
B: Length of horizontal pipe section
before vertical elbow.
(Dimensions in feet)
Example: If the vertical dimension from the floor of the
fireplace is 81⁄2' (2.6 m), the horizontal run to vertical elbow
must not exceed 16' (4.9 m).
Example: Maximum horizontal length
No elbows = 10’ (3 m)
1x45° elbows = 8.5’ (2.6 m)
2x45° elbows = 7’ (2.1 m)
•A minimum of an 8' (2.5 m) vertical rise is required.
•Two sets of 45°elbows offsets may be used within the
vertical sections. From 0 to a maximum of 8' (2.5 m)
of vent pipe can be used between elbows. Figure 22
•The maximum angular variation allowed in the system
is 270°. Figure 22
•For the minimum height of the vent above the highest
point of penetration through the roof refer to Page 20,
Figure 26.
For models purchased after 4/16/15, please see addendum.

20306743 19
KSTDV Series Gas Fireplace
VENTING INSTALLATION
Example: Elbow 1 = 90°
Elbow 2 = 45°
Elbow 3 = 45°
Elbow 4 = 90°
Total Angular Variation = 270°
24" (610 mm) Min.
1
2
3
4
Figure 22 -
Maximum Elbow Usage
INSTALLATION FOR VERTICAL TERMINA-
TION
1. Determine the route your vertical venting will take. If
ceiling joist, roof rafters or other framing will obstruct
the venting system, consider an offset. Refer to Figure
24 to avoid cutting load bearing members.
Figure 23 -
Offset with Wall Strap and 45° Elbows
Roof Flashing
Wall Strap
45° Elbows
Ceiling Firestop
FP1669
For optimal flame appearance, a restrictor disk is necessary
on straight vertical runs of 10' of more.
•Runs may not incorporate elbows.
•The disk is part number 56D3027 and is included in
installation manual packet.
•Drop the disk into a 5" inner collar before installing the
first section of flue or install at the last section before
installing the termination. Also disk can be installed
from inside the firebox into the 5" inner collar.
•An additional disk may be installed on runs of 35' or
more. Rotate disks perpendicular to each other.
NOTE:Pay special attention to these installation instructions
for required clearances (air space) to combustibles when
passing through ceilings, walls, roofs, enclosures, attic
rafters, etc. Do not pack air spaces with insulation. Also
note maximum vertical rise of the venting system and any
maximum horizontal offset limitations. Offsets must fall
within the parameters shown in Figures 24 and 25.
2. Set fireplace in desired location. Drop a line plumb down
from the ceiling to the position of the flue exit. Mark the
center point where the vent will penetrate the ceiling.
Drill a small locating hole a this point.
Drop a plumb line from the inside of the roof to the ceiling
locating hole in the ceiling. Mark the center point where
the vent will penetrate the roof. Drill a small locating hole
at this point.
FLAT CEILING INSTALLATION
1. Cut a 101⁄2" (241 mm) square hole in the ceiling using
the locating hole as a center point The opening should
be framed to 101⁄2"x101⁄2" (267 x 267 mm) inside dimen-
sions as shown in Figure 25 using framing lumber the
same size as the ceiling joist. If the area above the
ceiling is an insulated ceiling or a room, nail firestop from
the top side. This prevents loose insulation from falling
into the required clearance space. Figure23. Otherwise,
install firestop below the framed hole. Figure 25
Figure 24 -
If Area Above is a Room, Install Firestop above Framed
Hole as Shown
Firestop
Nails
For models purchased after 4/16/15, please see addendum.

20 20306743
KSTDV Series Gas Fireplace VENTING INSTALLATION
2. Assemble the desired lengths of pipe and elbows nec-
essary to reach from the burner system flue up through
the firestop. Be sure pipe and elbow connections are
fully twist-locked.
3. Cut a hole in the roof using the locating hole as a center
point. (Cover any exposed open vent pipes before
cutting hole in roof). The 101⁄2"x101⁄2" (267 x 267 mm)
hole must be measured on the horizontal. Actual length
may be larger depending on the pitch of the roof. There
must be a 1" minimum clearance from the vent pipe to
combustible materials. (Insulation should be considered
a combustible material).
4. Connect a section of pipe and extend up through the
hole.
NOTE: If an offset is needed to avoid obstructions, you
must support the vent pipe every three (3) feet. Use wall
straps for this purpose. Page 18, Figure 21. Whenever
possible, use 45° elbows instead of 90° elbows. The 45°
elbow offers less restriction to the flow of the flue gases
and intake air.
5. Place the flashing over the pipe section(s) extending
through the roof. Secure the base of the flashing to
the roof and framing with roofing nails. Be sure roofing
material overlaps the top edge of the flashing. There
must be a 1" clearance from the vent pipe to combustible
materials.
6. Continue to add pipe sections until the height of the vent
cap meets the minimum building code requirements as
shown in Figure 26.
NOTE: You must increase vent height for steep roof
pitches. Nearby trees, adjoining roof lines, steep pitched
roofs, and other similar factors may cause poor draft or
down-drafting in high winds. Increasing the vent height
may solve this problem.
NOTE: If the vent pipe passes through any occupied areas
above the first floor, including storage spaces and closets,
you must enclose pipe. You may frame and sheetrock the
enclosure with standard construction material. Make sure
to meet the minimum allowable clearances to combustibles.
Do not fill any of the required clearance spaces with
insulation.
TERMINATION HEIGHT FOR VENTS ABOVE
FLAT OR SLOPED ROOFS
Figure 25 -
If Area Above is Not a Room, Install Firestop above
Framed Hole as Shown
10
1
/
2
"
10
1
/
2
"
Nails Firestop
FP1970
2 ft.
Min. 2 ft. Min.
X12
H*
Horizontal Overhang
Termination
Vent
Lowest
Discharge
Opening
Storm Collar
Flashing
Concentric
Vent Pipe
1" Minimum
Clearances to
Combustibles
Vertical Wall
FP1971
Figure 26 -
Minimum Chimney Clearance
Roof Pitch H (feet)
Flat to 6/12 1.0
Over 6/12 to 7/12 1.25
Over 7/12 to 8/12 1.5
Over 8/12 to 9/12 2.0
Over 9/12 to 10/12 2.5
Over 10/12 to 11/12 3.25
Over 11/12 to 12/12 4.0
*H - Minimum height from roof to
lowest discharge opening of vent
For models purchased after 4/16/15, please see addendum.