Vanguard VMH10TNB Quick start guide

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VENT-FREE NATURAL GAS
COMPACT CLASSIC HEARTH®FIREPLACE
OWNER’S OPERATION AND INSTALLATION MANUAL
®
Shown with Optional
Cabinet Mantel/Hearth
Base Accessory
VMH10TNB
10,000 Btu/Hr with
Thermostat
WARNING: If the information in this manual
is not followed exactly, a fire or explosion
may result causing property damage, per-
sonal injury, or loss of life.
— 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.
• Immediatelycallyourgassupplierfrom
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 per-
formed by a qualified installer, service
agency, or the gas supplier.
WARNING: Improper instal-
lation,adjustment,alteration,
service, or maintenance can
causeinjuryorpropertydam-
age. Refer to this manual for
correct installation and op-
erationalprocedures.Foras-
sistance or additional infor-
mationconsultaqualifiedin-
staller,serviceagency,orthe
gas supplier.
WARNING: This is an
unvented gas-fired heater. It
uses air (oxygen) from the
room in which it is installed.
Provisionsforadequatecom-
bustion and ventilation air
must be provided. Refer to
Air for Combustion and Ven-
tilation section on page 5 of
this manual.
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.
*Aftermarket: Completion of sale, not for purpose of resale, from the manufacturer

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107031
VENT-FREE NATURAL GAS COMPACT FIREPLACE
VMH10TNB
®
SAFETY
INFORMATION
Carbon Monoxide Poisoning: Early signs
ofcarbonmonoxidepoisoningresemblethe
flu, with headaches, dizziness, or nausea. If
you have these signs, the fireplace may not
beworkingproperly.Getfreshairatonce!
Have fireplace serviced. Some people are
more affected by carbon monoxide than
others. These include pregnant women,
peoplewithheartorlungdiseaseor anemia,
those under the influence of alcohol, and
those at high altitudes.
Natural Gas: Natural gas is odorless. An
odor-making agent is added to natural gas.
Theodorhelpsyoudetectanaturalgasleak.
However, the odor added to natural gas can
fade.Naturalgasmaybepresenteventhough
no odor exists.
Make certain you read and understand all
warnings.Keepthismanualforreference.It
isyourguidetosafeandproperoperationof
this fireplace.
WARNING ICON G 001
WARNINGS
IMPORTANT: Read this owner’s
manual carefully and completely
before trying to assemble, oper-
ate, or service this fireplace. Im-
proper use of this fireplace can
causeseriousinjuryordeathfrom
burns, fire, explosion, electrical
shock, and carbon monoxide
poisoning.
DANGER: Carbon monoxide
poisoning may lead to death!
WARNING:Anychangetothis
heater or its controls can be
dangerous.
WARNING: Do not allow fans
toblow directly intothe fireplace.
Avoid any drafts that alter burner
flame patterns. Ceiling fans can
create drafts that alter burner
flame patterns. Altered burner
patterns can cause sooting.
WARNING: Do not use a
blower insert, heat exchanger
insert,orotheraccessorynotap-
proved for use with this heater.
Due to high temperatures, the
appliance should be located out
oftraffic and awayfromfurniture
and draperies.
Do not place clothing or other
flammable material on or near
the appliance. Never place any
objects on the heater.
Fireplace front and screen be-
comes very hot when running
heater. Keep children and adults
away from hot surface to avoid
burnsorclothingignition.Heater
will remain hot for a time after
shutdown. Allow surface to cool
before touching.
Carefully supervise young chil-
drenwhentheyareinsameroom
with fireplace.
Youmustoperatethisheaterwith
a fireplace screen in place. Make
sure fireplace screen is closed
before running heater.
Keeptheapplianceareaclearand
free from combustible materials,
gasoline, and other flammable
vapors and liquids.
1. This appliance is only for use with the
typeofgas indicated on the rating plate.
Thisappliance is not convertible for use
with other gases.
2. 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 neighbor’s phone. Follow the
gas supplier’s instructions
• ifyoucannot reach your gas supplier,
call the fire department
3. This fireplace shall not be installed in
a bathroom.
4. Do not use this fireplace as a wood-
burning fireplace. Use only the logs
provided with the fireplace.
5. Do not add extra logs or ornaments
suchas pine cones, vermiculite, or rock
wool. Using these added items can
cause sooting. Do not add lava rock
aroundbase.Rockanddebriscouldfall
into the control area of fireplace.
6. This fireplace is designed to be smoke-
less. If logs ever appear to smoke, turn
offfireplace and call a qualified service
person. Note: During initial operation,
slight smoking could occur due to log
curing and fireplace burning manufac-
turing residues.
7. To prevent the creation of soot, follow
the instructions in Cleaning and Main-
tenance, page 23.
8. Before using furniture polish, wax, car-
pet cleaner, or similar products, turn
heater off. If heated, the vapors from
theseproducts may create a white pow-
der residue within burner box or on ad-
jacent walls or furniture.
9. This fireplaceneedsfresh air ventilation
to run properly. This fireplace has an
Oxygen Depletion Sensing (ODS)
safety shutoff system. The ODS shuts
down the fireplace if not enough fresh
air is available. See Air for Combustion
and Ventilation, pages 5 through 7. If
fireplacekeeps shuttingoff,seeTrouble-
shooting, pages 20 through 22.
10. Do not run fireplace
• where flammable liquids or vapors
are used or stored.
• under dusty conditions.
11. Do not use this fireplace to cook food
or burn paper or other objects.
12. Do not use fireplace if anyparthas been
under water. Immediately call a quali-
fied service technician to inspect the
room fireplace and to replace any part
of the control system and any gas con-
trol which has been under water.
13. Turn off and unplug fireplace and let
cool before servicing. Only a qualified
service person should service and re-
pair fireplace.
14. Operating fireplace above elevations of
4,500 feet could cause pilot outage.
15. Do not operate fireplace if any log is
broken. Do not operate fireplace if a
log is chipped (dime-sized or larger).

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107031
OWNER’S MANUAL
PRODUCT
IDENTIFICATION
LOCAL CODES
Install and use fireplace with care. Follow all
local codes. In the absence of local codes, use
the latest edition of The National Fuel Gas
CodeANSZ223.1,also known as NFPA 54*.
*Available from:
American National Standards Institute, Inc.
1430 Broadway
New York, NY 10018
National Fire Protection Association, Inc.
Batterymarch Park
Quincy, MA 02269
Figure 1 - Vent-Free Natural Gas Compact Fireplace
PRODUCT
FEATURES
SAFETY PILOT
This fireplace has a pilot with an Oxygen
Depletion Sensing (ODS) safety shutoff sys-
tem. The ODS/pilot is a required feature for
vent-freeroomfireplaces.TheODS/pilotshuts
offthefireplaceifthereisnotenoughfreshair.
PIEZO IGNITION SYSTEM
This fireplace has a piezo ignitor. This sys-
tem requires no matches, batteries, or other
sources to light fireplace.
THERMOSTATIC HEAT
CONTROL
Thisfireplacehasathermostat sensingbulb
and a control valve. The thermostat will
automatically modulate the heat output to
maintain a consistent room temperature.
This results in greater fireplace comfort.
This can also result in lower gas bills.
Ignitor Button
Screen
Fireplace
Cabinet
Log
Control Knob
UNPACKING
1. Remove log box and fireplace from
carton. IMPORTANT: The fireplace
hood is inside the cardboard protective
end wrap on the left side of fireplace
(as viewed from front). A decal is on
the outside of the cardboard end wrap
stating hood is enclosed (see Figure 2).
2. Remove hood from cardboard protec-
tive end wrap as shown in Figure 2.
3. Remove all protective packaging ap-
plied to fireplace for shipment.
4. Make sure your fireplace includes one
hardware packet.
5. Check fireplace for any shipping dam-
age. If fireplace is damaged, promptly
informdealerwhereyouboughtfireplace.
Figure 2 - Removing Fireplace Hood
IMPORTANT:
THIS PACKAGE CONTAINS A
FIREPLACE HOOD. UNWRAP
CARTON AND REMOVE HOOD
BEFORE DISCARDING
PROTECTIVE PACKAGING.
1
2
Hood
Cardboard
Protective
Fireplace
End Wrap
Hood Enclosed
Decal

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107031
VENT-FREE NATURAL GAS COMPACT FIREPLACE
VMH10TNB
®
ASSEMBLY
ASSEMBLING FIREPLACE
Tools Required:
• Phillips screwdriver
• 5/16" hex wrench
• slotted screwdriver
• scissors
Installing Log
1. Lift screen up and pull out to remove.
2. Cut two plastic straps to remove the log
from the firebox cavity.
3. An optionalbloweris available. SeeAc-
cessories, page 27. Install optional
blowernow.Follow installation instruc-
tions provided with blower.
4. Remove log packaging material and
discard packaging. Gently place log on
burner support (see Figure 3). The log
shouldfit flat against top of burner sup-
portand log locator tabs fitintothe slots
under the log. Do not allow log to con-
tact flame. If flame contacts log, soot
will be created.
5. Reattach screen by placing the notches
in the screen frame over the shoulder
screws and pushing down.
Figure 3 - Assembling Fireplace
WARNING: Always have
branch support and screen in
place before operating fireplace.
Thispreventsexcessivetempera-
tures on fireplace surfaces.
WARNING:Failuretoposition
thepartsinaccordancewiththese
diagrams or failure to use only
parts specifically approved with
this fireplace may result in prop-
erty damage or personal injury.
Assembling Hood
1. Locate four black phillips sheet metal
screws from the hardware packet.
2. Rotate hood as shown in Figure 4.
Make sure hood tabs point toward
fireplace.
3. Insert hood tabs between baffle and
louvers (see Figure 4).
4. Gently rotate hood to upright position.
Make sure hood tabs are behind lou-
vers and hood is resting on firebox top
(see Figure 4).
5. Align screw holes on hood with screw
holes on firebox top.
6. Insert screws as shown in Figure 4.
Tighten screws firmly.
Figure 4 - Assembling Hood
Hood Tab
Sheet Metal
Screws
Louver
Baffle
Firebox Top
Hood
Hood Tabs
Log
Screen
Burner
Support
With Log
Locator
Tabs
Branch
Support
Shoulder
Screw

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107031
OWNER’S MANUAL
AIR FOR
COMBUSTION AND
VENTILATION
Today’s homes are built more energy effi-
cient than ever. New materials, increased
insulation, and new construction methods
helpreduceheatlossinhomes.Homeowners
weatherstrip andcaulk aroundwindows and
doorstokeepthecoldairoutandthewarmair
in. During heating months, home owners
want their homes as airtight as possible.
While it is good to make your home energy
efficient,yourhomeneedstobreathe.Fresh
air must enter your home. All fuel-burning
appliances need fresh air for proper com-
bustion and ventilation.
Exhaustfans,fireplaces,clothesdryers,and
fuel burning appliances draw air from the
house to operate. You must provide ad-
equate fresh air for these appliances. This
will insure proper venting of vented fuel-
burning appliances.
WARNING: This heater shall
notbeinstalledinaconfinedspace
or unusually tight construction
unless provisions are provided
foradequatecombustionandven-
tilation air. Read the following in-
structions to insure proper fresh
air for this and other fuel-burning
appliances in your home.
PROVIDING ADEQUATE
VENTILATION
The following are excerpts from National
Fuel Gas Code. NFPA 54/ANS Z223.1, Sec-
tion5.3,AirforCombustionandVentilation.
Allspacesinhomesfallintooneofthethree
following ventilation classifications:
1. Unusually Tight Construction
2. Unconfined Space
3. Confined Space
The information on pages 5 through 7 will
help you classify your space and provide
adequate ventilation.
Unusually Tight Construction
The air that leaks around doors and win-
dows may provide enough fresh air for
combustion and ventilation. However, in
buildings of unusually tight construction,
you must provide additional fresh air.
Unusually tight construction is de-
fined as construction where:
a. walls and ceilings exposed to the
outside atmosphere have a con-
tinuous water vapor retarder with
a rating of one perm (6 x 10-11 kg
per pa-sec-m2) or less with open-
ings gasketed or sealed and
b. weather stripping has been
added on openable windows and
doors and
c. caulking or sealants are applied
to areas such as joints around
window and door frames, be-
tween sole plates and floors,be-
tween wall-ceiling joints, be-
tween wall panels, at penetra-
tionsforplumbing,electrical,and
gas lines, and at other openings.
If your home meets all of the three
criteria above, you must provide ad-
ditional fresh air. See Ventilation Air
From Outdoors , page 7.
If your home does not meet all of the
threecriteriaabove,proceedto Deter-
mining Fresh-Air Flow For Fireplace
Location , page 6.
Confined and Unconfined Space
The National Fuel Gas Code, ANS Z223.1
defines a confined space as a space whose
volume is less than 50 cubic feet per 1,000
Btu per hour (4.8 m3per kw) of the aggre-
gate input rating of all appliances installed
in that space and an unconfined space as a
space whose volume is not less than 50
cubicfeetper1,000Btuperhour(4.8m3per
kw) of the aggregate input rating of all
appliances installed in that space. Rooms
communicating directly with the space in
whichtheappliancesareinstalled*,through
openings not furnished with doors, are con-
sidered a part of the unconfined space.
This heater shall not be installed in a con-
fined space or unusually tight construction
unlessprovisions are provided for adequate
combustion and ventilation air.
*Adjoiningroomsarecommunicatingonly
iftherearedoorlesspassagewaysorventila-
tion grills between them.
Continued

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VENT-FREE NATURAL GAS COMPACT FIREPLACE
VMH10TNB
®
DETERMINING FRESH-AIR FLOW FOR FIREPLACE LOCATION
Determining if You Have a Confined or Unconfined Space
Use this worksheet to determine if you have a confined or unconfined space.
Space: Includes the room in which you will install fireplace plus any adjoining rooms with doorless passageways or ventilation grills
between the rooms.
1. Determine the volume of the space (length x width x height).
Length x Width x Height = ____________________ cu. ft. (volume of space)
Example: Space size 16 ft. (length) x 14 ft. (width) x 8 ft. (ceiling height) = 1792 cu. ft. (volume of space)
If additional ventilation to adjoining room is supplied with grills or openings, add the volume of these rooms to the total volume of
the space.
2. Multiply the space volume by 1000 Btu/Hr per 50 cubic feet to determine the maximum Btu/Hr the space can support.
_____________________(volume of space) x 1000 Btu/Hr = (Maximum Btu/Hr the space can support) 50 Cubic Feet
Example: 1792 Cubic Feet (volume of space) x 1000 Btu/Hr ÷50 Cubic Feet= 35,840 Btu/Hr. This is the maximum Btu/Hr the
space can support.
3. Add the Btu/Hr of all fuel burning appliances in the space.
Vent-free fireplace ________________________ Btu/Hr
Gas water heater* ________________________ Btu/Hr
Gas furnace ________________________ Btu/Hr
Vented gas heater ________________________ Btu/Hr
Gas fireplace logs ________________________ Btu/Hr
Other gas appliances* +________________________ Btu/Hr
Total =________________________ Btu/Hr
* Do not include direct-vent gas appliances. Direct-vent draws combustion air from the outdoors and vents to the outdoors.
4. Compare the maximum Btu/Hr the space can support with the actual amount of Btu/Hr used.
_________________ Btu/Hr (maximum the space can support)
_________________ Btu/Hr (actual amount of Btu/Hr used)
Example: 35,840 Btu/Hr (maximum the space can support)
40,000 Btu/Hr (actual amount of Btu/Hr used)
ThespaceintheaboveexampleisaconfinedspacebecausetheactualBtu/HrusedismorethanthemaximumBtu/Hrthespacecansupport.
You must provide additional fresh air. Your options are as follows:
A. Rework worksheet, adding the space of an adjoining room. If the extra space provides an unconfined space, remove door to adjoin-
ing room or add ventilation grills between rooms. See Ventilation Air From Inside Building, page 7.
B. Vent room directly to the outdoors. See Ventilation Air From Outdoors, page 7.
C. Install a lower Btu/Hr fireplace, if lower Btu/Hr size makes room unconfined.
If the actual Btu/Hr used is less than the maximum Btu/Hr the space can support, the space is an unconfined space. You will need no
additional fresh air ventilation.
WARNING:Iftheareainwhichtheheatermaybeoperatedissmallerthanthatdefinedasanunconfinedspace
or if the building is of unusually tight construction, provide adequate combustion and ventilation air by one of
the methods described in the National Fuel Gas Code, ANS Z223.1, Section 5.3 or applicable local codes.
AIR FOR
COMBUSTION AND
VENTILATION
Continued
Example:
Gas water heater 30,000 Btu/Hr
Vent-free fireplace + 10,000 Btu/Hr
Total = 40,000 Btu/Hr

7
107031
OWNER’S MANUAL
AIR FOR
COMBUSTION AND
VENTILATION
Continued
Figure 5 - Ventilation Air from Inside Building Shown with Optional Mantel
VENTILATION AIR
Ventilation Air From Inside
Building
Thisfreshairwouldcomefromanadjoining
unconfined space. When ventilating to an
adjoining unconfined space, you must pro-
vide two permanent openings: one within
12" of the ceiling and one within 12" of the
floor on the wall connecting the two spaces
(seeoptions1and2,Figure5).Youcanalso
remove door into adjoining room (see op-
tion 3, Figure 5). Follow the National Fuel
Gas Code, NFPA 54/ANS Z223.1, Section
5.3, Air for Combustion and Ventilation for
required size of ventilation grills or ducts.
Or
Remove
Door into
Adjoining
Room,
Option 3
Ventilation Grills
Into Adjoining Room,
Option 2
12"
12"
Ventilation
Grills
into Adjoining
Room,
Option 1
WARNING: Rework work-
sheet, adding the space of the
adjoiningunconfinedspace.The
combined spaces must have
enough fresh air to supply all
appliances in both spaces.
Figure 6 - Ventilation Air from Outdoors Shown with Optional Mantel
Ventilation Air From Outdoors
Provide extra fresh air by using ventilation
grills or ducts. You must provide two per-
manent openings: one within 12" of the
ceiling and one within 12" of the floor.
Connecttheseitemsdirectlytotheoutdoors
orspacesopentotheoutdoors.Thesespaces
include attics and crawl spaces. Follow the
National Fuel Gas Code, NFPA 54/ANS
Z223.1,Section5.3,AirforCombustionand
Ventilation for required size of ventilation
grills or ducts.
IMPORTANT: Do not provideopenings for
inlet or outlet air into attic if attic has a
thermostat-controlledpowervent.Heatedair
enteringtheatticwillactivatethepowervent.
Outlet
Air Ventilated
Attic
Outlet
Air
Inlet
Air
Inlet Air Ventilated
Crawl Space
To
Crawl
Space
To Attic

8
107031
VENT-FREE NATURAL GAS COMPACT FIREPLACE
VMH10TNB
®
CAUTION: If you install the
fireplace in a home garage
• fireplacepilotandburnermust
be at least 18 inches above
floor.
• locate fireplace where moving
vehicle will not hit it.
For convenience and efficiency, install
fireplace
• where there is easy access for operation,
inspection, and service
• in coldest part of room
An optional blower kit is available from
your dealer. See Accessories, page 27. If
planning to use blower, follow instructions
provided with the blower for power source.
6"
Minimum
From
Sides Of
Fireplace
Left
Side
CEILING
36"
Minimum
FLOOR
Right
Side
Figure7-MountingClearancesAsViewed
From Front of Fireplace Shown Built In
The Wall
CAUTION:Thisheatercreates
warmaircurrents.Thesecurrents
moveheattowallsurfacesnextto
heater. Installing heater next to
vinyl or cloth wall coverings or
operatingheaterwhereimpurities
(suchastobaccosmoke,aromatic
candles, cleaning fluids, oil or
kerosene lamps, etc.) in the air
exist, may discolor walls.
IMPORTANT: Vent-freefireplacesaddmois-
ture to the air. Although this is beneficial,
installing fireplace in rooms without enough
ventilationairmaycausemildewtoformfrom
too much moisture. See Air for Combustion
and Ventilation, pages 5 through 7.
WARNING: A qualified ser-
vicepersonmustinstallfireplace.
Follow all local codes.
Note: Your Vanguard fireplace is designed
to be used in zero clearance installations.
Wall or framing material can be placed
directly against any exterior surface on the
rear, sides, or top of your fireplace, except
where standoff spacers are integrally at-
tached. If standoff spacers are attached to
your fireplace, these spacers can be placed
directly against wall or framing materials.
Use the dimensions shown for rough open-
ings to create the easiest installations (see
Built-In Fireplace Installation, page 9).
CHECK GAS TYPE
Use only natural gas. If your gas supply is
notnaturalgas,donot install fireplace. Call
the dealer where you bought your fireplace
for the proper type fireplace.
INSTALLATION ITEMS
Before installing fireplace, make sure you
have the items listed below.
• piping (check local codes)
• sealant (resistant to propane/LP gas)
• equipment shutoff valve*
• test gauge connection*
• ground joint union
• sediment trap
• tee joint
• pipe wrench
*AnCSA/AGAdesign-certifiedequipment
shutoff valve with 1/8" NPT tap is an ac-
ceptable alternative to test gauge connec-
tion. Purchase the optional CSA/AGA de-
WARNING: Maintain the mini-
mum clearances shown in Figure
7 and Figure 8, page 9. If you can,
provide greater clearances from
floor, ceiling, and joining wall.
LOCATING FIREPLACE
Ifyour fireplace isto be usedwith an optional
mantel, the installation instructions included
with your mantel shows an CSA/AGA ap-
provedmethodofattachingthefireplace/man-
telsystem toawall. IMPORTANT: Only use
optionalcabinetorcornermantelsspecifiedin
this manual. Purchase the optional mantel
from your dealer (see Accessories, page 27).
Ifyourfireplaceistoberecessedintothewall,
see Built-In Fireplace Installation, page 9, to
secure your fireplace into the wall.
WARNING: Never install the
fireplace
• in a bathroom
• in a recreational vehicle
• where curtains, furniture,
clothing, or other flammable
objectsarelessthan36inches
from the front, top, or sides of
the fireplace
• as a fireplace insert
• in high traffic areas
• in windy or drafty areas
INSTALLATION
NOTICE: This heater is intended
foruse as supplementalheat.Use
this heater along with your pri-
mary heating system. Do not in-
stall this heater as your primary
heat source. If you have a central
heating system, you may run
system’scirculationblowerwhile
usingheater.Thiswillhelpcircu-
late the heat throughout the
house. In the event of a power
outage,youcanuse this heater as
your primary heat source.
sign-certifiedequipmentshutoffvalvefrom
your dealer. See Accessories, page 27.
Note: Ifdesired,purchaseafour-sidedbrass
trimkit forbuilt-in installations.SeeAcces-
sories, page 27.
NOTICE: If you install the fire-
place in a bedroom, some build-
ing codes require that the fire-
place/mantel system be secured
to (or within) a wall. You can po-
sitionfireplaceinanoptionalcabi-
net or corner mantel. You can
alsorecessfireplaceintothewall.

9
107031
OWNER’S MANUAL
Figure8-MountingClearancesAsViewed
From Front of Fireplace Shown with Op-
tional Mantel
Top Of
Mantel Can
Be Flush
With Wall
Left
Side
CEILING
Right
Side
36"
Minimum
INSTALLATION
Continued
Continued
36 5/8" 25 7/8"
51 3/4"
26 7/8"
Figure 10 - Rough Opening for Installing
in Corner
1. Frameinroughopening.Usedimensions
shown inFigure 9 forthe roughopening.
If installing in a corner, use dimensions
shown in Figure 10 for the rough open-
ing. The height is 26 7/8" which is the
same as the wall opening above.
26 7/8"
26 7/8"
3/4" Off
The Floor
Minimum
10 1/2"
Figure9-RoughOpeningforInstallingin
Wall
BUILT-IN FIREPLACE
INSTALLATION
Built-ininstallationofthisfireplaceinvolves
installing fireplace into a framed-in enclo-
sure. This makes the front of fireplace flush
with wall. An optional brass trim kit acces-
soryisavailable(seeAccessories,page27).
Brasstrimwillextendpastsidesoffireplace
approximately 1/2 inch. This will cover the
rough edges of the wall opening. If install-
ingabuilt-inmantelabovethefireplace,but
you must follow the clearances shown in
Figure 12, page 10. Follow the instructions
belowto installthe fireplaceinthis manner.
Note: Your Vanguard fireplace is designed
to be used in zero clearance installations.
Wall or framing material can be placed
directly against any exterior surface on the
rear, sides, or top of your fireplace.
Actual Framing
Height 26" 26 7/8"
Front Width 26 3/4" 26 7/8"
Depth 9 1/2" 10 1/2"
Bottom 3/4" 3/4"
2. An optional blower accessory is avail-
able (see Accessories, page 27). There
arethree options for connecting blower
to electrical source.
Option one: Install fireplace near an
electrical outlet. See Blower Instruc-
tions for power cord length.
Optiontwo: Havea licensed electrician
installa properly grounded, three-prong
120-volt electrical outlet at fireplace
location. Locate outlet inside the
framed enclosure. Blower power cord
will plug into this outlet.
Option three: Have a licensed electri-
cianconnectblowertoelectrical source
at junction box inside fireplace.
If using option one, have electrical out-
let installed at this time. If using option
two, do not connect blower to electrical
source at junction box until step 7.
3. Install gas piping to fireplace location.
This installation includes an approved
flexible gas line (if allowed by local
codes) after the equipment shutoff
valve. The flexible gas line must be the
last item installed on the gas piping.
4. If you have not assembled firebox, fol-
low instructions on page 4.
5. Carefully set fireplace in front of rough
opening with back of fireplace inside
wall opening.
6. Attach flexible gas line to fireplace gas
regulator. See Connecting Fireplace to
Gas Supply, page 15.
7. If the optionalblowerhas been installed
connect blower to electrical source.
Options one and two: Route blower
electrical cord through side or rear ac-
cess door of fireplace. Plug electrical
cord into electrical outlet.
Option three: Have a licensed electri-
cianconnectblowertoelectrical source
at junction box inside fireplace.
8. Bend four nailing flanges on outer cas-
ing with pliers (see Figure 11).
9. Attach fireplace to wall studs using
nails or wood screws through holes in
nailing flange.
10. Check all gas connections forleaks.See
Checking Gas Connections, page 16.
11. If using optional brass trim kit, install
the trim after final finishing and/or
painting of wall. See instructions in-
cluded with brass trim accessory for at-
taching brass trim.
Figure 11 - Attaching Fireplace to Wall
Studs
Nailing
Flanges
Nails or
Wood
Screws

10
107031
VENT-FREE NATURAL GAS COMPACT FIREPLACE
VMH10TNB
®
13" 16"
19"
21"
2 1/2"
6"
8"
10"
Note:
All vertical
measurements
are from top of
fireplace
opening to
bottom of
mantel shelf. All
measurements
are in inches.
OPTIONAL MANTEL
INSTALLATION
Note: Refer to instructions provided with
the mantel for assembly instructions. Refer
to instructions below for system installa-
tion. Refer to instructions on page 4 for
fireboxassembly. Bloweraccessoryshould
beinstalled if itis being used(see Installing
Blower Accessory GA3400T, pages 11
through 13).
1. Unscrew four brass screws that attach
top louver to fireplace. Remove louver
from fireplace and set aside.
2. Place fireplace on wood base.
3. Place mantel around fireplace/base as-
sembly.
4. Assemble brass trim kit. See Assem-
bling Brass Trim, page 11.
5. Firmly snap brass trim kit on shoulder
screws. Shoulder screws are located on
fireplace cabinet (see Figure 13).
6. Align brass trim kit for flush fit around
opening.
7. Use two 3" wood screws provided and
attach fireplace base to wooden base
(see Figure 13).
Figure 12 - Minimum Mantel Clearances
for Built-In Installation
Mantel Shelf
Side of
Firebox
8. Place assembly next to wall at installa-
tion location.
9. Remove brass trim kit and mantel. Be
careful not to damage wall or mantel.
10. Attach wood base to floor with two1 3/4"
blackscrewsprovided(seeFigure14).If
the floor is concrete use anchor method
(seeAttachingWoodBasetoSolid Floor,
page 14).
11. Install gas line. See Connecting To Gas
Supply, page 14.
12. Check for leaks. See Checking Gas
Connections, page 16.
13. Place mantel around fireplace. Be care-
ful not to damage wall or mantel.
14. Place brass trim kit on the shoulder
screws located on the side and top of
thefireplace.Firmly snap the brass trim
over the shoulder screws on fireplace
(see Figure 13).
15. Adjust assembly to remove any gaps.
Attach remaining two 3" wood screws
from hardware pack through openings
inside of fireplace sides into the man-
tel. The openings are located at top be-
hind the area for the brass louvers (see
Figure 13).
16. Reinstall top brass louvers.
INSTALLATION
Continued
Figure 13 - Attaching Brass Trim to Fireplace
Figure 14 - Attaching Wood Base to Floor
1 3/4" Screw Wood Base
Shoulder
Screws
Assembled
Brass Trim
Hole for 3"
Wood Screw
for Attaching
Fireplace to
Wooden Base
Hole for 3"
Wood Screw
for Attaching
Fireplace to
Mantel
Mantel Clearances for Built-In
Installation
If placing mantel above built-in fireplace,
youmustmeetminimumclearancebetween
mantel shelf and top of fireplace opening.
NOTICE:Surfacetemperaturesof
adjacent walls and mantels be-
comehotduringoperation.Walls
and mantels above the firebox
may become hot to the touch. If
installedproperly,thesetempera-
turesmeettherequirementofthe
national product standard. Fol-
low all minimum clearances
shown in this manual.
NOTICE:Ifyourinstallation does
notmeettheminimumclearances
shown, you must do one of the
following:
• raise the mantel to an accept-
able height
• remove the mantel

11
107031
OWNER’S MANUAL
Assembling Brass Trim (Brass
trim shipped with mantel)
1. Remove packaging from three remain-
ing pieces of brass trim.
2. Locate two adjusting plates with set
screws, and two shims in the hardware
packet.
3. Align shim under adjusting plate as
shown in Figure 15.
4. Slide one end of adjusting plate/shim
inslotonmiterededgeoftopbrasstrim
(see Figure 15).
5. Slide other end of adjusting plate/shim
in slot on mitered edge of side brass
trim (see Figure 15).
6. While firmly holding edges of brass
trim together, tighten both set screws
on the adjusting plate with slotted
screwdriver.
7. Repeat steps 1 through 6 for other corner.
8. Set brass assembly aside for later in-
stallation.
Figure 15 - Assembling Brass Trim
INSTALLATION
Continued
Side Brass
Trim
Top Brass Trim
Mitered
Edge
Shim
Set
Screws
Adjusting
Plate
Slot
Slot
Continued
INSTALLING BLOWER
ACCESSORY GA3400T
Removing Upper Louver
Assembly
To install the blower accessory, you must
first remove the upper louver assembly.
1. Lift screen off heater.
2. Remove 4 screws from louver assem-
bly (see Figure 16). Save these screws.
3. Pull louver assembly straight out from
the cabinet. Be careful not to scratch
the paint. Set louver assembly and
screws aside.
Figure 16 - Removing Upper Louver As-
sembly
Removing Valve Cover Shield
1. Open bottom louver assembly by
swinging the assembly down (see Fig-
ure 17).
2. Using short Phillips screwdriver, re-
move the screw under the center of the
branch support. Rotate valve cover
shield clockwise and slide out.
IMPORTANT: Do not remove shoul-
derscrewontheleftsideofvalvecover
shield. Slide the valve cover shield off
of the shoulder screw (see Figure 17).
Note: If you donothave a short Phillips
screwdriver, the screen, logset, and
branch support must be removed so a
longer screwdriver may be used. See
Connecting Fireplace To Gas Supply,
page 15 and follow step 2.
Figure17- Removing Valve Cover Shield
Installing Blower Assembly
CAUTION: Label all wires
priortodisconnectionwhenser-
vicing controls. Wiring errors
cancauseimproperanddanger-
ous operation.
CAUTION: Verify proper op-
eration after servicing.
Note: If you are using a mantel with your
heater, use the following instructions. If
your heater is built-in, see For Built-In In-
stallation on page 13.
1. Install snap bushingsfoundin hardware
kitintobothholesin rear of valve cover
shield.
2. Make sure the wire harness is firmly
connectedto theterminalson theblower
bracket assembly.
3. Note the wire locations on back of
AUTO/OFF/ON switch.The terminals
on back of switch are numbered 1, 2,
and 3. Carefully remove red wire from
terminal 1 and blue wire from terminal
3. Black wire can remain on middle
terminal 2 (see Figure 18, page 12).
Upper Louver
Assembly
Brass Screws
Blower Bracket
Mounting Holes
1
2
Remove
Screw
Valve
Cover
Shield
Shoulder
Screw
Branch
Support
Snap
Bushings
Bottom Louver
Assembly

12
107031
VENT-FREE NATURAL GAS COMPACT FIREPLACE
VMH10TNB
®
4. Carefully disconnect green and white
wires at their insulated connectors.
5. In top of the heater cabinet, locate the
four mounting holes on the outer cas-
ing. Align these four holes with those
on the blower bracket assembly.Attach
blower bracket assembly to the outer
casing with 4 #10 screws provided (see
Figure 18).
Figure 18 - Installing Blower Bracket Assembly
6. Route the wire harness through the
hole in left side of baffle. Pull wire
harness through lower opening above
where the valve shield was removed.
(see Figure 18).
7. Insert the 4 wire harness into one of the
roundholes inthe rear ofthe valvecover
shield and through the rectangular hole
in the front of shield (see Figure 18).
8. Reconnect red wire to switch position
3. Reconnect blue wire to switch posi-
tion1. Reconnectgreen andwhitewires.
Figure19-InstallingSwitchPlatetoValve
Cover Shield
Switch
Plate Screw
Valve Cover
Shield
INSTALLATION
Continued
9. Install the switch plate on the valve
covershield with 2#10 screws provided
(see Figure 19). Reinstall the valve
cover shield. Route power cord out of
the cabinet by inserting it through the
bushing on the outer casing (see Fig-
ure 18). Plug fan kit into 120-Volt
grounded power supply and test opera-
tion. Note: When switch is in the
AUTO position, the fan will start after
the heater has run for a few moments.
The fan will continue to run for several
moments after the heater has been
turned off. When switch is in the ON
position, the fan will run until turned
to OFF. Reinstall upper louver assem-
bly and hood if previously removed,
(see Figure 16, page 11). Close lower
louver door.
3
2
1
Wire
Harness
Blower Bracket
Assembly
Screw
Power
Cord
Valve Cover
Shield Box Cover
Wire
Harness
Switch
Plate
Switch
Baffle
Wiring Routing
Hole in Baffle
Blue Red

13
107031
OWNER’S MANUAL
For Built-In Installation
WARNING: A licensed elec-
trician must connect the wiring
harness to electrical supply fol-
lowing all local codes. Electri-
cian must provide a clamp on
the box cover to secure the wir-
ing. Wiring should be routed
through the bushing in the hole
on the outer casing of heater.
Follow instructions Removing Valve Cover
Shield (page 11), then
1. Install a snap bushing found in hard-
ware kit into one of the holes found on
rear of valve cover shield. The other
hole is for a strain relief clamp (not
supplied) to secure incoming electrical
supply.
2. Follow steps 2 through 6 in Installing
Blower Assembly, pages 11 and 12.
Also remove black wire from middle
switch terminal 2.
3. Remove black plastic strain relief and
power cord from switch plate. The
power cord supplied will not be used in
built-in installations. Pop in the plastic
snapbushingfoundinhardwarekitinto
thehole left by supply cord/strainrelief.
4. A licensed electrician must follow the
wiring diagram to connect incoming
electrical supply to fan kit wiring har-
ness (see Figure 20).
5. Plug power cord totheoutletreceptacle
(not provided) as shown in figure 21.
Wind the extra cable in power cord and
tie it up with the plastic wire strap (see
Figure 21). Set the cable bundle be-
tween the burner bracket and outer cas-
ing, away from the burner.
6. Reinstall valve cover shield.
7. Test to make sure the blower is work-
ing properly.
8. Reinstall upper louver assembly and
hoodif previously removed,(seeFigure
16, page 11). Close lower louver door.
Figure 21 - Installing Blower Bracket Assembly
INSTALLATION
Continued
Figure 20 - Wiring Diagram For Blower
Accessory Built-In Installation
Extension Cord
Useextensioncord if needed. The cord must
have a three-prong, grounding plug and a
three-hole receptacle. Make sure cord is in
goodshape.Itmustbeheavyenoughtocarry
the current needed. An undersized cord will
cause a drop in line voltage. This will result
in loss of power and overheating. Use a No.
16 AWG cord for lengths less than 50 feet.
Continued
Red
Red
Fan Switch
(Auto/Off/On)
Blue
Blue
Thermostat
Switch
(N.O.)
Green
White Green
White
On
110/115
V.A.C.
Blower
Motor
Black
Off
1
23
Auto
3
2
1
Blower Bracket
Assembly
Screw
Wire
Harness
Power
Cord
Valve
Cover
Shield Box Cover Wire
Harness
Switch Plate
Switch
Clamp Connector
(not included)
Outlet
Receptacle
Blue Red
Plastic Wire
Strap

14
107031
VENT-FREE NATURAL GAS COMPACT FIREPLACE
VMH10TNB
®
CONNECTING TO GAS
SUPPLY
WARNING: A qualified ser-
vice person must connect fire-
place to gas supply. Follow all
local codes.
IMPORTANT: Checkgas linepressurebe-
fore connecting fireplace to gas line. Gas
line pressure must be no greater than 14
inchesofwater.Ifgaslinepressureishigher,
fireplace regulator damage could occur.
Installation must include an equipment
shutoffvalve,union,andplugged 1/8" NPT
tap. Locate NPT tap within reach for test
gauge hook up. NPT tap must be upstream
from heater (see Figure 23).
IMPORTANT: Installanequipmentshutoff
valve in an accessible location. The equip-
ment shutoff valve is for turning on or shut-
ting off the gas to the appliance.
We recommend that you install a sediment
trap in supply line as shown in Figure 23.
Locate sediment trap where it is within
reach for cleaning. Install in piping system
betweenfuelsupplyandheater.Locatesedi-
ment trap where trapped matter is not likely
to freeze. A sediment trap traps moisture
and contaminants. This keeps them from
going into fireplace controls. If sediment
trap is not installed or is installed wrong,
fireplace may not run properly.
WARNING: Never connect
fireplace to private (non-utility)
gas wells. This gas is commonly
known as wellhead gas.
CAUTION: Use only new,
black iron or steel pipe. Inter-
nally-tinned copper tubing may
be used in certain areas. Check
your local codes. Use pipe of
1/2" or greater diameter to al-
low proper gas volume to fire-
place. If pipe is too small, un-
dueloss of pressurewilloccur.
CAUTION:Usepipejointseal-
ant that is resistant to liquid pe-
troleum (LP) gas.
Attaching Wood Base to Solid
Floor
For attaching base to solid floors (concrete
or masonry)
Note: Floor anchors and mounting screws
are in hardware package. The hardware
package is provided with fireplace.
1. Drill holes at marked locations using
5/16"drill bit. For solid floors(concrete
or masonry), drill at least 1" deep.
2. Fold floor anchoras shown inFigure 22.
3. Insert floor anchor (wings first) into
hole. Tap anchor flush to floor.
4. Insert mounting screws through base
and into floor anchors.
5. Tighten screws until base is firmly fas-
tened to floor.
Figure 22 - Folding Anchor
INSTALLATION
Continued
Apply pipe joint sealant lightly to male
threads. This will prevent excess sealant
fromgoing into pipe. Excess sealant inpipe
could result in clogged fireplace valves.
* Purchase the optional CSA/AGA design-certified equipment shutoff valve from your
dealer. See Accessories, page 27.
CSA/AGA Design-Certified Equipment
Shutoff Valve With 1/8" NPT Tap*
3" Minimum
From Gas
Meter (5"
W.C. to
10.5" W.C.
Pressure)
Approved Flexible
Gas Line
Pipe Nipple Cap Tee Joint
Sediment Trap
Figure 23 - Gas Connection
WARNING: This appliance re-
quiresa45°male flare fitting 5/8"-
18 UNF (Unified National Fine
Thread) inlet connection and the
flexible gas line provided.

15
107031
OWNER’S MANUAL
INSTALLATION
Continued
Figure 24 - Removing Log Base Assembly From Fireplace
CONNECTING FIREPLACE
TO GAS SUPPLY
Installation Items Needed
• Phillips screwdriver
• sealant (resistant to propane/LPgas, not
provided)
1. Remove fireplace screen. Remove two
screws that hold fireplace screen in
place for shipping. These screws are
located near top of screen. Discard
screws.Lift fireplace screen up and pull
out to remove.
2. Remove screws that attach branch sup-
port to fireplace (see Figure 24). Care-
fully lift up branch support and remove
from fireplace (see Figure 24).
3. Route flexible gas line (provided by
installer)from equipment shutoffvalve
into fireplace through side or rear ac-
cess holes in outer casing. Route flex-
ible gas supply line through fireplace
access holes in outer casing.
Flexible Gas Line from
Fireplace Gas Regulator
Provided With Fireplace
To Fireplace
Gas Regulator
NOTICE:Mostbuildingcodesdo
not permit concealed gas con-
nections. A flexible gas line is
provided to allow accessibility
fromthefireplace(seeFigure25).
The flexible gas supply line con-
nection to the equipment shutoff
valve should be accessible.
➞
Figure 25 - Attaching Flexible Gas Lines Together
Gas Connector
Flexible Gas Line from
Equipment Shutoff Valve
Provided By Installer
Equipment Shutoff Valve
➞
To Gas
Supply
4. Apply pipe joint sealant lightly to male
threads of gas connector attached to
flexible gas line (see Figure 25). Con-
nectflexiblegaslinetoflexiblegasline
attached to gas regulator of fireplace
(see Figure 25).
5. Check all gasconnectionsfor leaks. See
Checking Gas Connections, page 16.
6. Replace branch support back into fire-
place. Feed flexible gas line into fire-
place base area while replacing branch
support. Make sure the entire flexible
gas line is in fireplace base area. Reat-
tach branch support to fireplace with
screws removed in step 2.
Flexible Gas
Line
Branch
Support
Screen
Shoulder
Screw
Continued

16
107031
VENT-FREE NATURAL GAS COMPACT FIREPLACE
VMH10TNB
®
ON
POSITION
OFF
POSITION
Pressure Testing Gas Supply
Piping System
Test Pressures In Excess Of 1/2 PSIG
(3.5 kPa)
1. Disconnect appliance with its appliance
maingasvalve(controlvalve)andequip-
mentshutoffvalve from gas supply pip-
ing system. Pressures in excess of 1/2
psig will damage heater regulator.
2. Cap off open end of gas pipe where
equipmentshutoffvalve was connected.
3. Pressurize supply piping system by ei-
ther using compressed air or opening
main gas valve located on or near gas
meter.
4. Check all joints of gas supply piping
system. Apply mixture of liquid soap
and water to gas joints. Bubbles form-
ing show a leak.
5. Correct all leaks at once.
6. Reconnect fireplace and equipment
shutoff valve to gas supply. Check re-
connected fittings for leaks.
Open
Closed
Equipment
Shutoff
Valve
CHECKING GAS
CONNECTIONS
Figure 26 - Equipment Shutoff Valve
Figure 27 - Checking Gas Joints
WARNING: Test all gas pip-
ing and connections for leaks
after installing or servicing. Cor-
rect all leaks at once.
WARNING:Neveruseanopen
flame to check for a leak. Apply a
mixture of liquid soap and water
to all joints. Bubbles forming
show a leak. Correct all leaks at
once.
INSTALLATION
Continued
Test Pressures Equal To or Less Than
1/2 PSIG (3.5 kPa)
1. Close equipment shutoffvalve (seeFig-
ure 26).
2. Pressurize supply piping system by ei-
ther using compressed air or opening
main gas valve located on or near gas
meter.
3. Check all joints from gas meter to
equipment shutoff valve (see Figure
27). Apply mixture of liquid soap and
water to gas joints. Bubbles forming
show a leak.
4. Correct all leaks at once.
Pressure Testing Fireplace Gas
Connections
1. Open equipment shutoffvalve (see Fig-
ure 26).
2. Open main gas valve located on or near
gas meter.
3. Make sure control knob of fireplace is
in the OFF position.
4. Check all jointsfromequipment shutoff
valve to thermostat gas valve (see Fig-
ure 27). Apply mixture of liquid soap
and water to gas joints. Bubbles form-
ing show a leak.
5. Correct all leaks at once.
6. Light fireplace (see Operating Fire-
place,pages 17 and 18). Checkallother
internal joints for leaks.
7. Turn off fireplace (see To Turn Off Gas
to Appliance, page 18).
8. Replace front panel.
Gas Meter
Equipment
Shutoff
Valve

17
107031
OWNER’S MANUAL
CAUTION:Donottrytoadjust
heatinglevelsbyusingtheequip-
ment shutoff valve.
Figure 29 - Pilot
(Actual Pilot May Vary From Illustration)
OPERATING
FIREPLACE
FOR YOUR SAFETY
READ BEFORE
LIGHTING
WARNING: If you do not fol-
low these instructions exactly, a
fireorexplosionmayresultcaus-
ing property damage, personal
injury or loss of life.
LIGHTING
INSTRUCTIONS
1. STOP! Read the safety information,
column 1.
2. Make sure equipment shutoff valve
is fully open.
3. Turncontrolknob clockwise
Clockwise
to the OFF position.
4. Wait five (5) minutes toclearout any
gas. Then smell for gas, including
near the floor. If you smell gas,
STOP! Follow “B” in the safety in-
formation, column 1. If you don’t
smell gas, go to the next step.
5. Turn control knob counterclockwise
C-clockwise
to the PILOT position.Press
in control knob for five (5) seconds
(see Figure 28).
Ignitor Button
Figure 28 - Control Knob In The OFF
Position
A. Thisappliancehasa pilotwhichmust
belighted byhand.Whenlightingthe
pilot,followtheseinstructionsexactly.
B. BEFORE LIGHTING smell all
aroundtheapplianceareaforgas.Be
suretosmellnext to thefloorbecause
some gas is heavier than air and will
settle on the floor.
WHAT TO DO IF YOU SMELL
GAS
• Do not try to light any appliance.
• Donottouchanyelectric switch;do
notuseanyphoneinyourbuilding.
• Immediatelycall yourgassupplier
from a neighbor’s phone. Follow
the gas supplier’s instructions.
• If you cannot reach your gas sup-
plier, call the fire department.
C. Useonlyyourhandtopushinor turn
thegascontrolknob. Neverusetools.
If the knob will not push in or turn
by hand, don’t try to repair it, call a
qualified service technician or gas
supplier. Force or attempted repair
may result in a fire or explosion.
D. Do not use this appliance if any part
has been under water. Immediately
call a qualified service technician to
inspect the appliance and to replace
any part of the control system and
any gas control which has been un-
der water.
Control Knob
WARNING:Youmustoperate
this fireplace with the fireplace
screen in place. Make sure fire-
place screen is installed before
running fireplace.
NOTICE: During initial operation
of new fireplace, burning logs
will give off a paper-burning
smell.Openwindowtoventsmell.
Operate fireplace on HI position
to burn off odor. This will only
last a few hours.
Note: You may be running this fire-
place for the first time after hooking
up to gas supply. If so, the control
knob may need to be pressed in for
30 seconds. This will allow air to
bleed from the gas system.
• If control knob does not pop up
when released, contact a qualified
service person or gas supplier for
repairs.
6. With control knob pressed in, push
downandreleaseignitorbutton.This
will light pilot. The pilot is attached
tothefrontofburner. If needed, keep
pressing ignitor button until pilot
lights.
Note: If pilot does not stay lit, refer
to Troubleshooting, pages 20 through
22. Also contact a qualified service
person or gas supplier for repairs.
Untilrepairsaremade,lightpilotwith
match. To light pilot with match, see
Manual Lighting Procedure, page 18.
7. Keep control knob pressed in for 30
seconds after lighting pilot.After 30
seconds, release control knob.
Note: If pilot goes out, repeat steps
3 through 7. This fireplace has a
safety interlock system.Wait one (1)
minute before lighting pilot again.
8. Turn control knob counterclockwise
C-clockwise
todesiredheating level.The
mainburner should light. Set control
knob to any heat level between HI
and LO.
Continued
Thermocouple
Ignitor Electrode
Pilot Burner

18
107031
VENT-FREE NATURAL GAS COMPACT FIREPLACE
VMH10TNB
®
TO TURN OFF GAS
TO APPLIANCE
Thermostat Control Operation
The thermostat used on this fireplace
senses the room temperature. At times
the room may exceed the set tempera-
ture. If so, the burner will shut off. The
burner will cycle back on when room
temperature drops below the set tem-
perature.
The control knob can be set to any heat
level between HI and LO.
Note: The thermostat sensing bulb mea-
sures the temperature of air near the
fireplace cabinet. This may not always
agree with room temperature (depend-
ing on housing construction, installation
location, room size, open air tempera-
tures, etc.). Frequent use of your fire-
place will let you determine your own
comfort levels.
OPERATING
FIREPLACE
Continued
Shutting Off Fireplace
1. Turncontrolknobclockwise
to the OFF position.
2. Turn off all electric power to the ap-
pliance if service is to be performed.
Shutting Off Burner Only (pilot
stays lit)
Turn control knob clockwise to
the PILOT position.
1. Follow steps 1through5 under Light-
ing Instructions, page 17.
2. With control knob pressed in, strike
match. Hold match to pilot until pi-
lot lights.
3. Keep control knob pressed in for 30
seconds after lighting pilot.After 30
seconds, release control knob. Now
follow step 8, page 17.
MANUAL LIGHTING
PROCEDURE
OPERATING BLOWER
Thisblowerhasthreesettings:ON,OFF,
andAUTO.IntheONposition,theblower
will operate constantly. In the OFF posi-
tion, the blower will not operate. In the
AUTOposition,theblowerwillstartwhen
thethermostatsensesasufficientincrease
in firebox temperature.
Note: Your fireplace and thermostat
blower will not turn on and off at the
same time. The fireplace may run for
several minutes before the blower turns
on.Aftertheheatermodulatestothepilot
position, the blower will continue to run.
The blower will shut off after the firebox
temperature decreases.
Note: Itissafetooperatefireplacewith
blowerturnedoff.However,theblower
helps distribute heated air from the
fireplace.
Figure 30 - Auto/Off/On Switch
OFF
ON
Auto/Off/On Switch

19
107031
OWNER’S MANUAL
BURNER FLAME PATTERN
Figure 33 shows a correct burner flame
pattern.Figure34showsanincorrectburner
flame pattern. The incorrect burner flame
pattern shows the flame consistently higher
than one inch above the log.
Ifburnerflamepatternisincorrect,asshown
in Figure 34
• turn fireplace off (see To Turn Off Gas to
Appliance, page 18)
• seeTroubleshooting, pages20 through 22
Figure 33 - Correct Burner Flame Pattern
Figure34 - IncorrectBurner Flame Pattern
Top of Flame Consistently About
One Inch Higher Than Logs
Top of Flame About
One Inch Below Logs
INSPECTING
BURNER
Figure 31 - Correct Pilot Flame Pattern
(Actual Pilot May Vary From Illustration)
Figure 32 - Incorrect Pilot Flame Pattern
(Actual Pilot May Vary From Illustration)
Check pilot flame pattern and burner flame
pattern often.
PILOT FLAME PATTERN
Figure31showsacorrectpilotflamepattern.
Figure 32 shows an incorrect pilot flame
pattern.Theincorrectpilotflameisnotprop-
erlyheatingthethermocouple.Thiswillcause
thethermocouple to cool.When the thermo-
couple cools, the fireplace will shut down.
If pilot flame pattern is incorrect, as shown
in Figure 32
• turn fireplace off (see ToTurn Off Gas to
Appliance, page 18)
• seeTroubleshooting, pages20 through 22
Thermocouple Pilot Burner
Pilot Burner
Thermocouple

20
107031
VENT-FREE NATURAL GAS COMPACT FIREPLACE
VMH10TNB
®
TROUBLESHOOTING
POSSIBLE CAUSE
1. Ignitor cable pinched or wet
2. Ignitor electrode notconnectedtoignitor
cable
3. Broken ignitor cable
4. Bad piezo ignitor
5. Ignitor electrode broken
6. Ignitor electrode positioned wrong
1. Gas supply turned off or equipment
shutoff valve closed
2. Control knob not in PILOT position
3. Control knob not pressed in while in
PILOT position
4. Air in gas lines when installed
5. ODS/pilot is clogged
6. Gas regulator setting is not correct
1. Control knob not fully pressed in
2. Control knob not pressed in longenough
3. Safety interlocksystem hasbeentriggered
4. Equipment shutoff valve not fully open
5. Thermocouple connection loose at con-
trol valve
6. Pilot flame not touching thermocouple,
which allows thermocouple to cool,
causing pilot flame to go out. This prob-
lem could be caused by one or both of
the following:
A) Low gas pressure
B) Dirty or partially clogged ODS/pilot
7. Thermocouple damaged
8. Control valve damaged
REMEDY
1. Free ignitor cable if pinched by any
metal or tubing. Keep ignitor cable dry
2. Reconnect ignitor cable
3. Replace ignitor cable
4. Replace piezo ignitor
5. Replace ignitor
6. Replace ignitor
1. Turn on gas supply or open equipment
shutoff valve
2. Turn control knob to PILOT position
3. Press in control knob while in PILOT
position
4. Continue holding down controlknob.Re-
peatignitingoperation untilairis removed
5. Clean ODS/pilot (see Cleaning and
Maintenance, page 23) or replace ODS/
pilot assembly
6. Replace gas regulator
1. Press in control knob fully
2. After ODS/pilot lights, keep control
knob pressed in 30 seconds
3. Wait one minute for safetyinterlock sys-
tem to reset. Repeat ignition operation
4. Fully open equipment shutoff valve
5. Hand tighten until snug, then tighten 1/4
turn more
6. A) Contact local natural gas company
B) Clean ODS/pilot (see Cleaning and
Maintenance, page 23) or replace ODS/
pilot assembly
7. Replace thermocouple
8. Replace control valve
OBSERVED PROBLEM
When ignitor button is pressed, there is no
spark at ODS/pilot
When ignitor button is pressed, there is
spark at ODS/pilot but no ignition
ODS/pilot lights but flame goes out when
control knob is released
WARNING: Turn off and un-
plugfireplace and letcoolbefore
servicing. Only a qualified ser-
vice person should service and
repair fireplace.
CAUTION: Never use a wire,
needle, or similar object to clean
ODS/pilot.ThiscandamageODS/
pilot unit.
Note: For additional help, visit DESA
International’stechnicalservicewebsite
at www.desatech.com.
Note: Alltroubleshootingitemsarelistedin
order of operation.
www.desatech.com