Vanguard VMH3000TPA Quick start guide

Save this manual for future reference.
VENT-FREE PROPANE/LP GAS
MINI-HEARTH®HEATER
OWNER’S OPERATION AND INSTALLATION MANUAL
VMH3000TPA
Shown with Optional
Mantel Which Features
a Built-In Base
WARNING: If the information in this manual is not
followed exactly, a fire or explosion may result caus-
ing property damage, personal 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.
• Immediately call your gas supplier from a
neighbor’s phone. Follow the gas supplier’s
instructions.
• Ifyoucannotreachyourgassupplier,callthefire
department.
— Installationandservicemustbeperformedbyaquali-
fied installer, service agency, or the gas supplier.
WARNING: Improper installation,
adjustment,alteration,service,or
maintenance can cause injury or
property damage. Refer to this
manualforcorrectinstallationand
operational procedures. For as-
sistanceoradditionalinformation
consult a qualified installer, ser-
vice agency, or the gas supplier.
WARNING: This is an unvented
gas-fired heater. It uses air (oxy-
gen) from the room in which it is
installed.Provisionsforadequate
combustion and ventilation air
mustbeprovided.Referto Airfor
Combustionand Ventilation sec-
tion on page 5 of this manual.
®
15,000 to 30,000 Btu/Hr
withThermostat
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

2
107098
PROPANE/LP GAS RESIDENTIAL HEATERS
®
For more information, visit www.desatech.com
LOCAL CODES
Install and use heater with care. Follow all
local codes. In the absence of local codes, use
the latest edition of The National Fuel Gas
Code,ANSZ223.1,alsoknownasNFPA54*.
*Available from:
American National Standards Institute, Inc.
1430 Broadway
New York, NY 10018
National Fire Protection Association, Inc.
Batterymarch Park
Quincy, MA 02269
SAFETY
INFORMATION
Carbon Monoxide Poisoning: Early signs
ofcarbonmonoxidepoisoningresemblethe
flu, with headaches, dizziness, or nausea. If
you have these signs, the heater may not be
working properly. Get fresh air at once!
Have heater serviced. Some people are
more affected by carbon monoxide than
others. These include pregnant women,
peoplewithheartorlungdiseaseoranemia,
those under the influence of alcohol, and
those at high altitudes.
Propane/LP Gas: Propane/LP gas is odor-
less.Anodor-makingagentisadded to gas.
The odor helps you detect a gas leak. How-
ever, the odor added to gas can fade. Gas
may be present even though no odor exists.
Make certain you read and understand all
warnings.Keepthismanualforreference.It
isyourguidetosafeandproperoperationof
this heater.
DANGER: Carbon monoxide
poisoning may lead to death!
IMPORTANT: Read this owner’s
manual carefully and completely
before trying to assemble, oper-
ate, or service this heater. Im-
proper use of this heater can
causeseriousinjuryordeathfrom
burns, fire, explosion, electrical
shock, and carbon monoxide
poisoning.
WARNINGS
WARNING: Any change to
this heater or its controls can be
dangerous.
1. This appliance is only for use with the
typeofgasindicated on the ratingplate.
Thisapplianceisnot convertible foruse
with other gases.
2. Do notplacepropane/LPsupply tank(s)
inside any structure. Locate propane/
LP supply tank(s) outdoors.
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 neighbor’s phone. Follow the
gas supplier’s instructions
• ifyoucannotreachyour gas supplier,
call the fire department
WARNING: Do not use a
blower insert, heat exchanger
insert, or other accessory not
approvedforusewiththisheater.
4. This heater shall not be installed in a
bedroom or bathroom.
5. This heaterneedsfresh,outsideair ven-
tilation to run properly.This heater has
an Oxygen Depletion Sensing (ODS)
safety shutoff system. The ODS shuts
down the heater if not enough fresh air
is available. See Air For Combustion
and Ventilation, pages 5 through 7.
6. Before using furniturepolish,wax,car-
pet cleaner, or similar products, turn
heater off. If heated, the vapors from
theseproductsmaycreateawhitepow-
der residue within burner box or on
adjacent walls or furniture.
7. If heater shuts off, do not relight until
you provide fresh, outside air. If heater
keeps shutting off, have it serviced.
8. Do not run heater
• where flammable liquids or vapors
are used or stored.
• under dusty conditions.
9. Do not use heater if any part has been
under water. Immediately call a quali-
fied service technician to inspect the
room heater and to replace any part of
the control system and any gas control
which has been under water.
10. To prevent the creation of soot, follow
the instructions in Cleaning and Main-
tenance, page 19.
11. Turn off and unplug heater and let cool
beforeservicing. Onlya qualifiedservice
person should service and repair heater.
12. Operating heater above elevations of
4,500 feet could cause pilot outage.
13. To prevent performance problems, do
not use a propane/LP fuel tank of less
than 100 lbs. capacity.
WARNING: Do not allow fans
to blow directly into the heater.
Avoidanydraftsthatalterburner
flame patterns. Ceiling fans can
create drafts that alter burner
flame patterns. Altered burner
patterns can cause sooting.
Do not place clothing or other
flammable material on or near
the appliance. Never place any
objects on the heater.
Carefully supervise young chil-
drenwhentheyareinsameroom
with heater.
Keeptheapplianceareaclearand
free from combustible materials,
gasoline, and other flammable
vapors and liquids.
Due to high temperatures, the
appliance should be located out
oftraffic and away fromfurniture
and draperies.
Surface of heater becomes very
hot when running heater. Keep
children and adults away from
hot surfaces to avoid burns or
clothing ignition. Fireplace will
remain hot for a time after shut-
down. Allow surfaces to cool be-
fore touching.
Make sure screen is in place be-
fore running heater.

3
107098
OWNER’S MANUAL
For more information, visit www.desatech.com
PRODUCT
IDENTIFICATION
Figure 1 - Vent-Free Gas Log Propane/LP Gas Space Heater
UNPACKING
1. Remove heater from carton.
2. Remove all protective packaging ap-
plied to heater for shipment.
3. Make sure your heater includes two
hardware packets.
4. Check heater for any shipping damage.
If heater is damaged, promptly inform
dealer where you bought heater.
ASSEMBLY
ASSEMBLING HEATER
Tools Required:
• Phillips screwdriver
• 5/16" hex wrench
• slotted screwdriver
Removing Front Panel Of Heater
1. Remove two screws near bottom cor-
ners of front panel with Phillips screw-
driver.
2. Pull bottomoffrontpanelforward, then
down (see Figure 2).
Figure2-RemovingFrontPanelofHeater
Continued
ASDFKIGLFJIalskdidkoemkgo dkirlnfgpd'fASDFKIGLFJI alskdidkoemkgo dkirlnfgpd'f
ASDFKIGLFJIalskdidkoemkgo dkirlnfgpd'fASDFKIGLFJI alskdidkoemkgo dkirlnfgpd'f
ASDFKIGLFJIalskdidkoemkgo dkirlnfgpd'fASDFKIGLFJI alskdidkoemkgo dkirlnfgpd'f
ASDFKIGLFJIalskdidkoemkgo dkirlnfgpd'fASDFKIGLFJI alskdidkoemkgo dkirlnfgpd'f
ASDFKIGLFJIalskdidkoemkgo dkirlnfgpd'fASDFKIGLFJI alskdidkoemkgo dkirlnfgpd'f
ASDFKIGLFJIalskdidkoemkgo dkirlnfgpd'fASDFKIGLFJI alskdidkoemkgo dkirlnfgpd'f
ASDFKIGLFJIalskdidkoemkgo dkirlnfgpd'fASDFKIGLFJI alskdidkoemkgo dkirlnfgpd'f
ASDFKIGLFJIalskdidkoemkgo dkirlnfgpd'fASDFKIGLFJI alskdidkoemkgo dkirlnfgpd'f
ASDFKIGLFJIalskdidkoemkgo dkirlnfgpd'ASDFKIGLFJI alskdidkoemkgo dkirlnfgpd'f
ASDFKIGLFJIalskdidkoemkgo dkirlnfgpd'fASDFKIGLFJI alskdidkoemkgo dkirlnfgpd'f
ASDFKIGLFJIalskdidkoemkgo dkirlnfgpd'fASDFKIGLFJI alskdidkoemkgo dkirlnfgpd'f
ASDFKIGLFJIalskdidkoemkgo dkirlnfgpd'fASDFKIGLFJI alskdidkoemkgo dkirlnfgpd'f
SDFKIGLFJIalskdidkoemkgo dkirlnfgpd'fASDFKIGLFJI alskdidkoemkgo dkirlnfgpd'f
ASDFKIGLFJIalskdidkoemkgo dkirlnfgpd'fASDFKIGLFJI alskdidkoemkgo dkirlnfgpd'f
ASDFKIGLFJIalskdidkoemkgo dkirlnfgpd'ASDFKIGLFJI alskdidkoemkgo dkirlnfgpd'f
ASDFKIGLFJIalskdidkoemkgo dkirlnfgpd'fASDFKIGLFJI alskdidkoemkgo dkirlnfgpd'f
ASDFKIGLFJIalskdidkoemkgo dkirlnfgpd'fASDFKIGLFJI alskdidkoemkgo dkirlnfgpd'f
ASDFKIGLFJIalskdidkoemkgo dkirlnfgpd'fASDFKIGLFJI alskdidkoemkgo dkirlnfgpd'f
ASDFKIGLFJIalskdidkoemkgo dkirlnfgpd'fASDFKIGLFJI alskdidkoemkgo dkirlnfgpd'f
ASDFKIGLFJIalskdidkoemkgo dkirlnfgpd'fASDFKIGLFJI alskdidkoemkgo dkirlnfgpd'f
ASDFKIGLFJIalskdidkoemkgo dkirlnfgpd'fASDFKIGLFJI alskdidkoemkgo dkirlnfgpd'f
ASDFKIGLFJIalskdidkoemkgo dkirlnfgpd'fASDFKIGLFJI alskdidkoemkgo dkirlnfgpd'f
ASDFKIGLFJIalskdidkoemkgo dkirlnfgpd'fASDFKIGLFJI alskdidkoemkgo dkirlnfgpd'f
ASDFKIGLFJIalskdidkoemkgo dkirlnfgpd'fASDFKIGLFJI alskdidkoemkgo dkirlnfgpd'f
ASDFKIGLFJIalskdidkoemkgo dkirlnfgpd'fASDFKIGLFJI alskdidkoemkgo dkirlnfgpd'f
ASDFKIGLFJIalskdidkoemkgo dkirlnfgpd'fASDFKIGLFJI alskdidkoemkgo dkirlnfgpd'f
ASDFKIGLFJIalskdidkoemkgo dkirlnfgpd'ASDFKIGLFJI alskdidkoemkgo dkirlnfgpd'f
ASDFKIGLFJIalskdidkoemkgo dkirlnfgpd'fASDFKIGLFJI alskdidkoemkgo dkirlnfgpd'f
ASDFKIGLFJIalskdidkoemkgo dkirlnfgpd'fASDFKIGLFJI alskdidkoemkgo dkirlnfgpd'f
ASDFKIGLFJIalskdidkoemkgo dkirlnfgpd'fASDFKIGLFJI alskdidkoemkgo dkirlnfgpd'f
SDFKIGLFJIalskdidkoemkgo dkirlnfgpd'fASDFKIGLFJI alskdidkoemkgo dkirlnfgpd'f
ASDFKIGLFJIalskdidkoemkgo dkirlnfgpd'fASDFKIGLFJI alskdidkoemkgo dkirlnfgpd'f
ASDFKIGLFJIalskdidkoemkgo dkirlnfgpd'ASDFKIGLFJI alskdidkoemkgo dkirlnfgpd'f
ASDFKIGLFJIalskdidkoemkgo dkirlnfgpd'fASDFKIGLFJI alskdidkoemkgo dkirlnfgpd'f
ASDFKIGLFJIalskdidkoemkgo dkirlnfgpd'fASDFKIGLFJI alskdidkoemkgo dkirlnfgpd'f
ASDFKIGLFJIalskdidkoemkgo dkirlnfgpd'fASDFKIGLFJI alskdidkoemkgo dkirlnfgpd'f
Ignitor Button
Screen
Front
Panel
Heater
Cabinet
Log
Lighting and
Warning Plates
Control Knob
PRODUCT
FEATURES
SAFETY DEVICE
This heater has a pilot with an Oxygen
Depletion Sensing (ODS) safety shutoff
system. The ODS/pilot is a required feature
for vent-free room heaters. The ODS/pilot
shuts off the heater if there is not enough
fresh air.
PIEZO IGNITION SYSTEM
This heater has a piezo ignitor. This system
requires no matches, batteries, or other
sources to light heater.
THERMOSTATIC HEAT
CONTROL
This heater has a thermostat sensing bulb
andacontrolvalve.Thisresultsinthegreat-
est heater comfort. This can also result in
lower gas bills.
Note: Do not remove
Lighting and Warning
Plates from heater
Installing Hood
1. Remove hood from protective tray.
2. Locate 4 black sheet metal screws in-
side hardware pack.
3. Place hood on deflector and line up
holes (see Figure 3, page 4).
4. Secure hood to deflector with 4 black
sheet metal screws.
Note: Sideofhoodshouldbeontheoutside
flange of deflector.
Installing Log
Note: For easier installation, lay heater on
its back.
1. With Phillips screwdriver, remove two
screwsholdingscreen in place.Remove
screen.
2. Remove log from inside of deflector.
Discard protective packaging.
3. Gently slide log between log retaining
brackets on deflector assembly (see Fig-
ure 3, page 4). The log should fit firmly
against bottom of log retaining brackets.
4. Reattach screen using two screws re-
moved in step 1.

4
107098
PROPANE/LP GAS RESIDENTIAL HEATERS
®
For more information, visit www.desatech.com
Attaching Brass Front Trim to
Front Panel
1. Locate brass front trim in brass trim
package.
2. Slide the head of two truss-head screws
from hardware packet into each end of
brass front trim (see Figure 4).
3. Line upscrewswithholes in front panel
(see Figure 3). Insert screws in holes.
Attach nuts from inside of front panel.
Tighten with wrench.
5. Slide other end of adjusting plate/shim
in slot on mitered edge of side brass
trim (see Figure 5).
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 side.
8. Place the assembled trim on front of
heater cabinet.Attach on top and sides
withfourbrassscrews included inhard-
ware package (see Figure 6).
9. Reattach front paneltoheaterifyouare
going to mount the heater to the base.
Do not reattach front panel at this time
ifyouaregoing to mount heatertowall.
Log
Retaining
Brackets
Figure 3 - Assembling Heater
Truss-Head
Screw Nut
Front Panel
Figure 4 - Attaching Brass Front Trim to
Front Panel
Brass Front Trim
Top Brass
Trim
Slot
Mitered Edge
Slot
Set
Screws
Adjusting
Plate
Screws
Assembled
Brass Trim
Shim
Figure 5 - Assembling Brass Trim
Figure6-AttachingBrassTrim to Heater
WARNING: Always have
burnershieldandscreeninplace
beforeoperatingheater.Thispre-
ventsexcessivetemperatureson
heater surfaces.
Failure to position the parts in
accordance with these diagrams
or failure to use only parts spe-
cificallyapprovedwiththisheater
mayresultinpropertydamageor
personal injury.
Side Brass
Trim
ASSEMBLY
Continued
Burner Shield
Screen
Front Panel
Deflector
Log
Truss-
Head
Screw
Brass Front Trim Screw
Screw
Heater Cabinet
Nut
Assembling and Attaching
Brass Trim
1. Remove packaging from three remain-
ing pieces of brass trim.
2. Locate four brass screws, two adjust-
ing plates with set screws, and two
shims in the hardware packet.
3. Align shim under adjusting plate as
shown in Figure 5.
4. Slide one end of adjusting plate/shim
inslotonmiterededgeof top brass trim
(see Figure 5).
Hood
Sheet Metal
Screw

5
107098
OWNER’S MANUAL
For more information, visit www.desatech.com
FRESH 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
weatherstripandcaulkaround windowsand
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.
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
unlessprovisionsareprovided for adequate
combustion and ventilation air.
*Adjoiningroomsarecommunicatingonly
iftherearedoorlesspassagewaysorventila-
tion grills between them.
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 (6x10-11 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 additional fresh
air. See Ventilation Air From Outdoors,
page 7.
If your home does not meet all of the three
criteriaabove,proceedtoDeterminingFresh-
Air Flow For Heater Location, page 6.
Continued

6
107098
PROPANE/LP GAS RESIDENTIAL HEATERS
®
For more information, visit www.desatech.com
DETERMINING FRESH-AIR FLOW FOR HEATER LOCATION
Determining if You Have a Confined or Unconfined Space
Use this worksheet to determine if you have a confined or unconfined space.
Space:Includestheroominwhichyouwillinstallheaterplusanyadjoiningroomswithdoorlesspassagewaysorventilationgrillsbetween
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 20 ft. (length) x 16 ft. (width) x 8 ft. (ceiling height) = 2560 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. Divide the space volume by 50 cubic feet to determine the maximum Btu/Hr the space can support.
_____________________(volume of space) ÷50 cu. ft. = (Maximum Btu/Hr the space can support)
Example: 2560 cu. ft. (volume of space) ÷50 cu. ft. = 51.2 or 51,200 (maximum Btu/Hr the space can support)
3. Add the Btu/Hr of all fuel burning appliances in the space.
Vent-free heater ___________________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: 51,200 Btu/Hr (maximum the space can support)
60,000 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 heater, 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.
AIR FOR COMBUSTION
AND VENTILATION
Continued
Example:
Gas water heater 30,000 Btu/Hr
Vent-free heater + 30,000 Btu/Hr
Total = 60,000 Btu/Hr
WARNING:Iftheareainwhichtheheatermaybeoperatedissmallerthanthatdefinedasanunconfinedspace
or if 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.

7
107098
OWNER’S MANUAL
For more information, visit www.desatech.com
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,Figure7).Youcanalso
remove door into adjoining room (see op-
tion 3, Figure 7). 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.
Figure 7 - Ventilation Air from Inside Building
Figure 8 - Ventilation Air from Outdoors
Or
Remove
Door into
Adjoining
Room,
Option 3
Ventilation Grills
Into Adjoining Room,
Option 2
12"
12"
Ventilation
Grills
into Adjoining
Room,
Option 1
Outlet
Air Ventilated
Attic
Outlet
Air
Inlet
Air
Inlet Air Ventilated
Crawl Space
To
Crawl
Space
To Attic
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.
AIR FOR
COMBUSTION AND
VENTILATION
Continued
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: Donotprovide openingsfor
inlet or outlet air into attic if attic has a
thermostat-controlledpowervent.Heatedair
enteringtheatticwillactivatethepowervent.

8
107098
PROPANE/LP GAS RESIDENTIAL HEATERS
®
For more information, visit www.desatech.com
WARNING: Never install the
heater
• in a bedroom or a bathroom
• in a recreational vehicle
• where curtains, furniture,
clothing, or other flammable
objectsarelessthan36inches
from the front, top, or sides of
the heater
• as a fireplace insert
• in high traffic areas
• in windy or drafty areas
IMPORTANT: Vent-free heaters add mois-
ture to the air. Although this is beneficial,
installing heater in rooms without enough
ventilationairmaycausemildewtoformfrom
too much moisture. See Fresh Air for Com-
bustion and Ventilation, pages 5 through 7.
INSTALLATION
CHECK GAS TYPE
Useonlypropane/LPgas.Ifyourgassupplyis
not propane/LP, do not install heater. Call
dealer where you bought heater for proper
type heater.
INSTALLATION ITEMS
Beforeinstallingheater,makesureyouhave
the items listed below.
• external regulator (supplied by installer)
• piping (check local codes)
• sealant (resistant to propane/LP gas)
• equipment shutoff valve *
• ground joint union
• test gauge connection *
• sediment trap
• tee joint
• pipe wrench
* ACSAdesign-certifiedequipmentshutoff
valve with 1/8" NPT tap is an acceptable
alternative to test gauge connection. Pur-
chase the optional CSA design-certified
equipment shutoff valve from your dealer.
See Accessories, page 23.
WARNING: A qualified ser-
vice person must install heater.
Follow all local codes.
NOTICE: This heater is intended
foruseassupplementalheat.Use
this heater along with your pri-
mary heating system. Do not in-
stall this heater as your primary
heatsource.Ifyouhaveacentral
heating system, you may run
system’scirculatingblowerwhile
usingheater.Thiswillhelpcircu-
late the heat throughout the
house. In the event of a power
outage, you can use this heater
as your primary heat source.
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.
LOCATING HEATER
You can locate heater on floor. The op-
tional hearth base is needed. You can also
install optional decorative mantels on the
heater (some mantels require the hearth
base). IMPORTANT: Only use optional
mantels and hearth base specified in this
manual. Purchase the optional mantel and
hearthbasefromyourdealer.SeeAccesso-
ries, page 23.
The heater may also be mounted on a wall.
Youcannotuseoptionalmantelifmounting
heater on a wall.
WARNING:Maintainthemini-
mumclearancesshowninFigure
9.Ifyoucan,providegreaterclear-
ancesfromfloor,ceiling,andjoin-
ing wall.
Figure9-MountingClearancesAsViewed
From Front of Heater
Forconvenienceandefficiency,installheater
• where there is easy access for operation,
inspection, and service.
• in coldest part of room.
An optional fan kit is available from your
dealer. See Accessories, page 23. If plan-
ningto usefan, locateheater nearanelectri-
cal outlet.
CAUTION: If you install the
heater in a home garage
• heaterpilotandburnermustbe
at least 18 inches above floor.
• locateheaterwheremovingve-
hicle will not hit it.
3"
FLOOR
CEILING
36"
Minimum
6"
Minimum
From
Sides Of
Heater
Left
Side Right Side
Minimum to
Top Surface
of Carpeting,
Tile, or Other
Combustible
Material

9
107098
OWNER’S MANUAL
For more information, visit www.desatech.com
Thermostat
Sensing Bulb
Clamp
THERMOSTAT SENSING
BULB
The thermostat sensing bulb has been placed
insidetheheaterforprotectionduringshipping.
Locating Thermostat Sensing
Bulb
1. Remove front panel of heater (see Fig-
ure 2, page 3).
2. Locate thermostat sensing bulb just
under burner assembly.
IMPORTANT: Attach thermostat sensing
bulb to back of heater for proper operation.
Attaching Thermostat Sensing
Bulb
1. Remove thermostat sensing bulb from
holders inside heater. Route through
slot opening in bottom of heater.
2. Place clamponthermostatsensingbulb
as shown in Figure 10. Clamp is pro-
vided in hardware package.
3. Snap clamp into upper mounting hole
as shown in Figure 10. Mounting hole
is located on lower left edge on back
of heater. Make sure the thermostat
sensing bulb is pointing up.
Figure10-AttachingThermostatSensing
Bulb
INSTALLATION OPTIONS
There are three options for mounting this
heater.
A. Mounting heater to wall
B. Mounting heatertooptionalhearth base
C. Mounting heater to optional mantel
(some mantels require the hearth base)
A. MOUNTING HEATER TO
WALL
Mounting Bracket
Themountingbracketislocatedinthepack-
age tray. Remove mounting bracket from
tray.
Methods For Attaching Mounting
Bracket To Wall
Only use last hole on each end of mounting
bracket to attach bracket to wall. These two
holes are 16 inches apart from their centers.
Attach mounting bracket to wall in one of
two ways.
1. Attaching to wall stud
2. Attaching to wall anchor
Attaching To Wall Stud: This method pro-
vides the strongest hold. Insert mounting
screws through mounting bracket and into
wall studs.
Attaching To Wall Anchor: This method
allows you to attach mounting bracket to
hollow walls (wall areas between studs) or
to solid walls (concrete or masonry).
Decidewhichmethodbettersuitsyourneeds.
Eithermethodwillprovideasecureholdfor
the mounting bracket.
Marking Screw Locations
1. Tape mounting bracket to wall where
heater will be located. Make sure
mounting bracket is level.
Figure11- MountingBracketClearances
Attaching Mounting Bracket To
Wall
Note: Wall anchors, mounting screws, and
spacers are in hardware package. The hard-
ware package is provided with heater.
Attaching To Wall Stud Method
Forattachingmountingbrackettowallstuds
1. Drill holes at marked locations using
9/64" drill bit.
2. Place mounting bracketontowall.Line
uplastholeoneachendof bracket with
holes drilled in wall.
3. Insert mountingscrewsthroughbracket
and into wall studs.
4. Tighten screws until mounting bracket
is firmly fastened to wall studs.
Continued
INSTALLATION
Continued
WARNING:Maintainminimum
clearancesshownin Figure 11. If
you can, provide greater clear-
ancesfromfloorandjoiningwall.
2. Mark screw locations on wall (see Fig-
ure 11).
Note: Only mark last hole on each end
of mounting bracket. Insert mounting
screws through these holes only.
3. Remove tape and mounting bracket
from wall.
18
3
/ 4 "
Min.
11"
Min. 16"
Adjoining Wall
Only Insert Mounting
Screws Through Last
Hole On Each End
Floor

10
107098
PROPANE/LP GAS RESIDENTIAL HEATERS
®
For more information, visit www.desatech.com
Attaching To Wall Anchor Method
For attaching mounting bracket to hollow
walls (wall areas between studs) or solid
walls (concrete or masonry)
1. Drill holes at marked locations using
5/16"drillbit.Forsolidwalls(concrete
or masonry), drill at least 1" deep.
2. Fold wallanchorasshown in Figure12.
3. Insert wall anchor (wings first) into
hole. Tap anchor flush to wall.
4. For thin walls (1/2" or less), insert red
key into wall anchor. Push red key to
“pop” open anchor wings.
IMPORTANT: Do not hammer key!
Forthickwalls(over 1/2" thick)orsolid
walls, do not pop open wings.
5. Place mounting bracketontowall.Line
uplastholeoneachendof bracket with
wall anchors.
6. Insert mountingscrewsthroughbracket
and into wall anchors.
7. Tighten screws until mounting bracket
is firmly fastened to wall.
INSTALLATION
Continued
Figure14-Mounting Heater Onto Mount-
ing Bracket
Installing Bottom Mounting
Screws
1. Locate two bottom mounting holes.
These holes are near bottom on back
panel of heater (see Figure 15).
2. Mark screw locations on wall.
3. Remove heaterfrommountingbracket.
4. If installing bottom mounting screws
into hollow or solid wall, install wall
anchors. Follow steps 1 through 4 un-
der Attaching To Wall Anchor Method.
If installing bottom mounting screw
into wall stud, drill holes at marked lo-
cations using 9/64" drill bit.
5. Replace heater onto mounting bracket.
6. Place spacers between bottom mount-
ingholesandwallanchorordrilledhole.
7. Hold spacer in place with one hand.
With other hand, insert mountingscrew
through bottom mounting hole and
spacer. Place tip of screw in opening
of wall anchor or drilled hole.
8. Tightenbothscrewsuntilheateris firmly
secured to wall. Do not over tighten.
Note: Do not replace front panel at this
time. Replace front panel after making
gas connections and checking for leaks
(see pages 12 and 13).
Figure 15 - Installing Bottom Mounting
Screws
B. MOUNTING HEATER ON
OPTIONAL HEARTH BASE
Tools needed:
• #2 Phillips screwdriver
• slotted screwdriver
• electric drill (if securing base to floor)
The optional hearth base kit includes the
following:
• Hearth Base
• 4 Wood Screws
• 4 Sheet Metal Screws
• Brass Base Trim
• Hearth Insert
• 4 Anchors
• 2 Brass Screws
Note: It is an option to secure “A” model
hearth base to floor. You must secure the
“B” and “C” model hearth base to floor. To
secure hearth base to floor, follow instruc-
tions under Securing Hearth Base to Floor,
page11.Ifnotsecuringhearthbaseto floor,
proceed to Mounting Heater to Optional
Hearth Base, page 11.
Figure 12 - Folding Anchor
Figure 13 - Popping Open Anchor Wings
For Thin Walls
Placing Heater On Mounting
Bracket
1. Locate two horizontal slots on back
panel of heater.
2. Place heater onto mounting bracket.
Slide horizontal slots onto stand-out
tabs on mounting bracket.
Horizontal Slots
Mounting Bracket
(attached to wall)
Stand-Out
Tab

11
107098
OWNER’S MANUAL
For more information, visit www.desatech.com
INSTALLATION
Continued
Mounting Heater to Optional
Hearth Base
1. Lay heater on its back on a table with
the bottom of heater overhanging the
edge of the table.
2. Remove 2 shipping screws in bottom
of heater. Discard shipping screws.
3. Line upmountingholeson topofhearth
basewithholesinbottomof heater (see
Figure 16).
4. Using a Phillips screwdriver, secure
hearth base to heater with four sheet
metal screws (see Figure 16).
5. Stand heater up on base.
6. Place hearth insert in hearth base as
shown in Figure 17.
7. Assemble brass trim (see steps 1
through 7 under Assembling and At-
taching Brass Trim, page 4).
8. Slide base trim on heater base. Attach
brasstrimtobase with twobrassscrews
included as shown in Figure 17.
Figure 16 - Attaching Heater to Hearth
Base
Base
Holes for Securing
Heater to Floor
Shipping Screw Bottom of Heater
Sheet Metal
Screw
Mounting
Holes Brass Base
Trim
Hearth
Insert
Screw
Figure17-PlacingHearthInsertonHeater
Base and Attaching Brass Base Trim
Securing Hearth Base to Floor
1. Position hearthbaseindesired location.
Markholesfordrilling(SeeFigure 16).
Remove hearth base.
2. For carpeted floor, make a small cut
with a sharp knife at marked locations
before drilling.
If securing to a wood floor, drill a 3/4"
deep hole using a 1/8" diameter drill bit.
Do not use anchors in wood floors. If
securing to a concrete floor, drill a 1 3/8"
deep hole using a 1/4" diameter concrete
drill bit. Completely insert anchors into
each hole.
3. Mount heater to hearth base following
steps under Mounting Heater to Op-
tional Hearth Base. After mounting
heater, position heater and hearth base
over drilled holes. With slotted screw-
driver, secure hearth base to floor with
four wood screws.
C. MOUNTING HEATER TO
OPTIONAL MANTEL.
See Instructions Included
With Mantel Kit.
IMPORTANT: Only use the optional man-
tels specified in this manual. See Accesso-
ries, page 23 for proper mantel kits. This
heaterisonlyapprovedforuse with models
GMF800/GMU801 series, GM900F/
GM901Useries,GM902F/GM903Useries,
GM700F/GM701U, and GM702F/
GM703Useriesmantelkits.Usinganyother
mantel will void the CSA approval for this
heater.OnlyusemodelsGMF800/GMU801
series,GM900F/GM901Useries,GM902F/
GM903U series, GM700F/GM701U, and
GM702F/GM703Useries mantelswith this
heater. Do not use these mantels with any
other product.
Continued

12
107098
PROPANE/LP GAS RESIDENTIAL HEATERS
®
For more information, visit www.desatech.com
Installation must include an equipment
shutoffvalve,union, andplugged1/8" NPT
tap. Locate NPT tap within reach for test
gauge hook up. NPT tap must be upstream
from heater (see Figure 19).
IMPORTANT: Installanequipmentshutoff
valve in an accessible location. The equip-
ment shutoff valve is for turning on or
shutting off the gas to the appliance.
Apply pipe joint sealant lightly to male
threads. This will prevent excess sealant
fromgoingintopipe. Excess sealantinpipe
could result in clogged heater valves.
Tee Joint
Reducer
Bushing to
1/8" NPT
1/8" NPT
Plug Tap
Test Gauge
Connection *
Tee Joint
Pipe Nipple
Cap
Sediment Trap
Figure 19 - Gas Connection
* A CSA design-certified equipment shutoff valve with 1/8" NPT tap is an acceptable
alternativetotestgaugeconnection.PurchasetheoptionalCSAdesign-certifiedequipment
shutoff valve from your dealer. See Accessories, page 23.
Pressure
Regulator
3/8" NPT
Pipe Nipple
Ground
Union Joint Heater
Cabinet
3" Minimum
Note: Burner bracket
not shown for clarity
Equipment
Shutoff Valve *
CONNECTING TO GAS
SUPPLY
Figure 18 - External Regulator with Vent
Pointing Down
CAUTION:Usepipejointseal-
ant that is resistant to liquid pe-
troleum (LP) gas.
Propane/LP
Supply Tank
Vent
Pointing
Down
External
Regulator
From External
Regulator (11" W.C.
to 14" W.C. Pressure)
The installer must supply an external regu-
lator. The external regulator will reduce
incoming gas pressure. You must reduce
incominggaspressuretobetween11and14
inchesofwater.Ifyoudonotreduceincom-
ing gas pressure, heater regulator damage
could occur. Install external regulator with
the vent pointing down as shown in Figure
18. Pointing the vent down protects it from
freezing rain or sleet.
INSTALLATION
Continued
CAUTION: Use only new,
black iron or steel pipe. Inter-
nally-tinned copper tubing may
be used in certain areas. Check
yourlocalcodes.Usepipeof1/2"
or greater diameter to allow
proper gas volume to heater. If
pipe is too small, undue loss of
pressure will occur.
We recommend that you install a sediment
trap in supply line as shown in Figure 19.
Locate sediment trap where it is within
reach for cleaning. Install in piping system
betweenfuelsupplyandheater.Locatesedi-
menttrapwheretrappedmatteris not likely
to freeze. A sediment trap traps moisture
and contaminants. This keeps them from
going into heater controls. If sediment trap
is not installed or is installed wrong, heater
may not run properly.
IMPORTANT: Holdpressureregulatorwith
wrench when connecting it to gas piping
and/or fittings.
WARNING:Thisappliancere-
quires a 3/8" NPT (National Pipe
Thread) inlet connection to the
pressure regulator.
WARNING: A qualified service
personmustconnectheatertogas
supply. Follow all local codes.
WARNING: Never connect
heater to private (non-utility) gas
wells. This gas is commonly
known as wellhead gas.

13
107098
OWNER’S MANUAL
For more information, visit www.desatech.com
ON
POSITION
OFF
POSITION
CHECKING GAS
CONNECTIONS
Pressure Testing Gas Supply
Piping System
Test Pressures In Excess Of 1/2 PSIG
(3.5 kPa)
1. Disconnect appliance with its appliance
maingas valve(controlvalve)andequip-
ment shutoff valve from gas supply pip-
ingsystem.Pressuresinexcessof1/2psig
will damage heater regulator.
2. Cap off open end of gas pipe where
equipmentshutoffvalvewas connected.
3. Pressurize supply piping system by ei-
ther using compressed air or opening
propane/LP supply tank valve.
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.
Test Pressures Equal To or Less Than
1/2 PSIG (3.5 kPa)
1. Close equipmentshutoffvalve (seeFig-
ure 20).
2. Pressurize supply piping system by ei-
ther using compressed air or opening
propane/LP supply tank valve.
3. Check all joints from propane/LP sup-
plytankto equipment shutoffvalve (see
Figure 21). Apply mixture of liquid
soap and water to gas joints. Bubbles
forming show a leak.
4. Correct all leaks at once.
Open
Closed
Equipment
Shutoff
Valve
Figure 21 - Checking Gas Joints
Equipment
Shutoff
Valve
Propane/LP
Supply Tank
Thermostat Gas
Valve Location
Figure 20 - Equipment Shutoff Valve
Pressure Testing Heater Gas
Connections
1. Open equipmentshutoffvalve(seeFig-
ure 20).
2. Open propane/LP supply tank valve.
3. Make sure control knob of heater is in
the OFF position.
4. Check alljointsfromequipment shutoff
valve to thermostat gas valve (see Fig-
ure 21). Apply mixture of liquid soap
and water to gas joints. Bubbles form-
ing show a leak.
5. Correct all leaks at once.
6. Light heater (see Operating Heater,
pages 14 and 15). Check all other in-
ternal joints for leaks.
7. Turn off heater (see To Turn Off Gas to
Appliance, page 14).
8. Replace front panel.
CAUTION: Make sure exter-
nal regulator has been installed
between propane/LP supply and
heater.Seeguidelinesunder Con-
necting to Gas Supply , page 12.
WARNING:Neveruseanopen
flame to check for a leak. Apply a
mixture of liquid soap and water
toalljoints.Bubblesformingshow
a leak. Correct all leaks at once.
WARNING: Test all gas pip-
ing and connections for leaks
after installing or servicing. Cor-
rect all leaks at once.
INSTALLATION
Continued

14
107098
PROPANE/LP GAS RESIDENTIAL HEATERS
®
For more information, visit www.desatech.com
PILOT
LO
OFF
HI
IGNITOR
OPERATING
HEATER
FOR YOUR SAFETY
READ BEFORE
LIGHTING
LIGHTING
INSTRUCTIONS
Figure 22 - Control Knob In The OFF
Position
Control Knob
Ignitor Button
1. STOP! Read the safety information,
column 1.
2. Make sure equipment shutoff valve
is fully open.
3. Turn control knob clockwise
to the OFF position.
4. Waitfive(5)minutestoclearoutany
gas. Then smell for gas, including
near the floor. If you smell gas,
STOP! Follow “B” in the safety in-
formation. If you don’t smell gas, go
to the next step.
5. Turn control knob counterclockwise
C-clockwise
tothePILOTposition. Press
in control knob for five (5) seconds
(see Figure 22).
Note: You may be running this
heater for the first time after hook-
ing up to gas supply. If so, the con-
trol knob may need to be pressed in
for 30 seconds. This will allow air to
bleed from the gas system.
6. With control knob pressed in, push
down and release ignitor button.
This will light pilot. The pilot is at-
tached to the front of burner. If
needed, keep pressing ignitor but-
ton until pilot lights.
Note: If pilot does not stay lit, refer
to Troubleshooting, pages 16 through
18. Also contact a qualified service
person or gas supplier for repairs.
Untilrepairsaremade,lightpilotwith
match. To light pilot with match, see
Manual Lighting Procedure, page 15.
Pilot Burner
Thermocouple
Figure 23 - Pilot
Ignitor Electrode
CAUTION:Donottrytoadjust
heatinglevelsbyusingtheequip-
ment shutoff valve.
TO TURN OFF GAS
TO APPLIANCE
Shutting Off Heater
1. Turncontrolknob clockwise
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.
A. Thisappliancehasa pilotwhichmust
belightedby hand.When lightingthe
pilot,followtheseinstructions exactly.
B. BEFORE LIGHTING smell all
aroundthe appliance areaforgas.Be
sureto smell next tothefloorbecause
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.
• Donottouchanyelectricswitch; do
notuseanyphoneinyour building.
• Immediatelycallyourgassupplier
from a neighbor’s phone. Follow
the gas supplier’s instructions.
• If you cannot reach your gas sup-
plier, call the fire department.
C. Useonlyyourhandtopush in orturn
thegascontrolknob.Never use tools.
If the knob will not push in or turn
by hand, don’t try to repair it, call a
qualified service technician 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.
WARNING: If you do not fol-
low these instructions exactly, a
fireorexplosionmayresultcaus-
ing property damage, personal
injury or loss of life.
7. Keep control knob pressed in for 30
seconds after lighting pilot.After 30
seconds, release control knob.
• If control knob does not pop up
when released, contact a quali-
fied service person or gas sup-
plier for repairs.
Note: If pilot goesout, repeatsteps
3through7.Thisheaterhasasafety
interlock system. Wait one (1)
minute before lighting pilot again.
8. Turn control knob counterclockwise
C-clockwise
todesiredheating level.The
mainburner should light.Setcontrol
knob to any heat level between HI
and LO.

15
107098
OWNER’S MANUAL
For more information, visit www.desatech.com
OPERATING
HEATER
Continued
THERMOSTAT
CONTROL
OPERATION
The thermostatic control used on this
heaterdiffersfromstandardthermostats.
Standardthermostatssimplyturnonand
off the burner. The thermostat used on
this heater senses the room temperature.
The thermostat adjusts the amount of gas
flow to the burner. This increases or de-
creases the burner flame height. At times
theroommayexceedthesettemperature.
If so, the burner will shut off. The burner
willcyclebackonwhenroomtemperature
drops below the set temperature.
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
heatercabinet.Thismaynotalwaysagree
with room temperature (depending on
housing construction, installation loca-
tion, room size, open air temperatures,
etc.). Frequent use of your heater will let
you determine your own comfort levels.
MANUAL LIGHTING
PROCEDURE
1. Remove front panel (see Figure 2,
page 3).
2. Followsteps1through 5underLight-
ing Instructions, page 14.
3. With control knob pressed in, strike
match. Hold match to pilot until pi-
lot lights.
4. Keep control knob pressed in for 30
seconds after lighting pilot.After 30
seconds, release control knob. Now
follow step 8 under Lighting Instruc-
tions, page 14.
5. Replace front panel.
Figure 24 - Correct Pilot Flame Pattern
Thermocouple
Thermocouple
INSPECTING
BURNER
Figure 25 - Incorrect Pilot Flame Pattern
Pilot Burner
Pilot Burner
Check pilot flame pattern and burner flame
pattern often.
PILOT FLAME PATTERN
Figure24showsacorrectpilotflamepattern.
Figure 25 shows an incorrect pilot flame
pattern.Theincorrectpilotflameisnottouch-
ing the thermocouple. This will cause the
thermocouple to cool. When the thermo-
couple cools, the heater will shut down.
If pilot flame pattern is incorrect, as shown
in Figure 25
• turn heater off (see To Turn Off Gas to
Appliance, page 14)
• seeTroubleshooting, pages16through 18
BURNER FLAME PATTERN
Figure 26 shows a correct burner flame
pattern.Figure27showsanincorrectburner
flame pattern. The incorrect burner flame
patternshowsyellowtippingoftheflame.It
also shows the flame higher than one inch
above the log.
Note: When using the heater the first time,
the flame will be yellow for approximately
one hour until the log cures.
NOTICE: Do not mistake orange
flames with yellow tipping. Dirt
or other fine particles enter the
heater and burn causing brief
patches of orange flame.
WARNING: If yellow tipping
occurs, your heater could pro-
duce increased levels of carbon
monoxide. If burner flame pat-
ternshowsyellowtipping,follow
instructions,bottomofthispage.
Ifburnerflamepatternisincorrect,asshown
in Figure 27
• turn heater off (see To Turn Off Gas to
Appliance, page 14)
• seeTroubleshooting, pages16through 18
Figure27-IncorrectBurnerFlamePattern
Figure 26 - Correct Burner Flame Pattern
Top of Flame Even
With Top of Log
Yellow Tipping

16
107098
PROPANE/LP GAS RESIDENTIAL HEATERS
®
For more information, visit www.desatech.com
TROUBLESHOOTING WARNING: Turn off and un-
plug heater and let cool before
servicing. Only a qualified ser-
vice person should service and
repair heater.
REMEDY
1. Replace ignitor
2. Replace ignitor
3. Reconnect ignitor cable
4. Free ignitor cable if pinched by any
metal or tubing. Keep ignitor cable dry
5. Tighten nut holding piezo ignitor to
heater cabinet. Nut is located inside
heater cabinet at top
6. Replace ignitor cable
7. Replace piezo 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 downcontrolknob.Re-
peatigniting operationuntil airisremoved
5. Contact local propane/LP gas company
6. Clean ODS/pilot (see Cleaning and
Maintenance, page 19) or replace ODS/
pilot assembly
7. 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 safety interlocksys-
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 propane/LP company
B) Clean ODS/pilot (see Cleaning and
Maintenance, page 19) or replace ODS/
pilot assembly
7. Replace thermocouple
8. Replace control valve
POSSIBLE CAUSE
1. Ignitor electrode positioned wrong
2. Ignitor electrode broken
3. Ignitor electrode not connected to igni-
tor cable
4. Ignitor cable pinched or wet
5. Piezo ignitor nut is loose
6. Broken ignitor cable
7. Bad piezo ignitor
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. Depleted gas supply
6. ODS/pilot is clogged
7. Gas regulator setting is not correct
1. Control knob not fully pressed in
2. Control knobnotpressedinlong enough
3. Safety interlock system has been trig-
gered
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
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
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

17
107098
OWNER’S MANUAL
For more information, visit www.desatech.com
REMEDY
1. Clean burner (see Cleaning and Mainte-
nance, page 19) or replace burner orifice
2. Replace burner orifice
3. Contact local propane/LP company
1. Contact local propane/LP company
2. Clean burner (see Cleaning and Mainte-
nance, page 19) or replace burner orifice
1. Clean burner (see Cleaning and Mainte-
nance, page 19) or replace burner orifice
2. Replace burner
3. Replace gas regulator
1. Check burner for dirt and debris. If
found, clean burner (see Cleaning and
Maintenance, page 19)
2. Replace gas regulator
1. Problem will stop after a few hours of
operation
1. Turn control knob to LO position and
let warm up for a minute
2. Operateburneruntilairisremovedfrom
line.Havegaslinecheckedbylocal pro-
pane/LP company
3. Observe minimum installation clear-
ances (see Figure 9, page 8)
4. Clean burner (see Cleaning and Mainte-
nance, page 19) or replace burner orifice
1. Turn heater off when using furniture
polish, wax, carpet cleaners, or similar
products
TROUBLESHOOTING
Continued
OBSERVED PROBLEM
Burner does not light after ODS/pilot is lit
Delayed ignition of burner
Burner backfiring during combustion
Yellow flame during burner combustion
Slightsmokeor odorduringinitial operation
Heater produces a whistling noise when
burner is lit
Whitepowderresidueformingwithinburner
box or on adjacent walls or furniture
POSSIBLE CAUSE
1. Burner orifice is clogged
2. Burner orifice diameter is too small
3. Inlet gas pressure is too low
1. Manifold pressure is too low
2. Burner orifice is clogged
1. Burner orifice is clogged or damaged
2. Burner damaged
3. Gas regulator defective
1. Not enough air
2. Gas regulator defective
1. Residues from manufacturing processes
1. Turning control knob to HI position
when burner is cold
2. Air in gas line
3. Air passageways on heater blocked
4. Dirty or partially clogged burner orifice
1. When heated, vaporsfromfurniturepol-
ish, wax, carpet cleaners, etc. turn into
white powder residue
Continued
www.desatech.com

18
107098
PROPANE/LP GAS RESIDENTIAL HEATERS
®
For more information, visit www.desatech.com
TROUBLESHOOTING
Continued
WARNING: 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.
• Immediatelycallyourgassupplierfromaneighbor’sphone.Followthe
gas supplier’s instructions.
• If you cannot reach your gas supplier, call the fire department.
IMPORTANT: Operating heater where impurities in air exist may create odors. Cleaning
supplies, paint, paint remover, cigarette smoke, cements and glues, new carpet or textiles,
etc., create fumes. These fumes may mix with combustion air and create odors.
OBSERVED PROBLEM
Heater produces a clicking/ticking noise
just after burner is lit or shut off
Heater produces unwanted odors
Heater shuts off in use (ODS operates)
Gas odor even when control knob is in OFF
position
Gas odor during combustion
POSSIBLE CAUSE
1. Metal expanding while heating or con-
tracting while cooling
1. Heater burning vapors from paint, hair
spray, glues, etc. (see IMPORTANT
statement above)
2. Gas leak. SeeWarning statement at
top of page
1. Not enough fresh air is available
2. Low line pressure
3. ODS/pilot is partially clogged
1. Gas leak. SeeWarning statement at
top of page
2. Control valve defective
1. Foreign matter between control valve
and burner
2. Gas leak. SeeWarning statement at
top of page
REMEDY
1. This is common with most heaters. If
noiseisexcessive,contact qualified ser-
vice person
1. Ventilate room. Stop using odor caus-
ing products while heater is running
2. Locate andcorrectallleaks(seeCheck-
ing Gas Connections, page 13)
1. Openwindowand/ordoorforventilation
2. Contact local propane/LP company
3. Clean ODS/pilot (see Cleaning and
Maintenance, page 19)
1. Locate andcorrectallleaks(seeCheck-
ing Gas Connections, page 13)
2. Replace control valve
1. Take apart gas tubing and remove for-
eign matter
2. Locate andcorrectallleaks(seeCheck-
ing Gas Connections, page 13)
www.desatech.com

19
107098
OWNER’S MANUAL
For more information, visit www.desatech.com
CLEANING AND
MAINTENANCE
CABINET
Air Passageways
• Use a vacuum cleaner or pressurized air
to clean.
Exterior
• Use a soft cloth dampened with a mild
soap and water mixture. Wipe the cabi-
net to remove dust.
CAUTION: You must keep
control areas, burner, and circu-
lating air passageways of heater
clean. Inspect these areas of
heater before each use. Have
heaterinspectedyearlybyaquali-
fied service person. Heater may
needmorefrequentcleaningdue
to excessive lint from carpeting,
pet hair, bedding material, etc.
WARNING: Turn off heater
and let cool before cleaning.
CLEANING BURNER
INJECTOR HOLDER AND
PILOT AIR INLET HOLE
The primary air inlet holes allow the proper
amount of air to mix with the gas. This
provides a clean burning flame. Keep these
holes clear of dust, dirt, lint, and pet hair.
Clean these air inlet holes prior to each
heating season. Blocked air holes will cre-
ate soot. We recommend that you clean the
unit every three months during operation
andhaveheater inspected yearlybya quali-
fied service person.
Wealsorecommendthatyoukeeptheburner
tube and pilot assembly clean and free of
dustanddirt.Tocleanthesepartswerecom-
mend using compressed air no greater than
30 PSI. Your local computer store, hard-
ware store, or home center may carry com-
pressed air in a can. You can use a vacuum
cleaner in the blow position. If using com-
pressed air in a can, please follow the direc-
tions on the can. If you don't follow direc-
tionsonthecan, youcoulddamagethepilot
assembly.
1. Shut off the unit, including the pilot.
Allow the unit to cool for at least thirty
minutes.
2. Inspect burner, pilot, and primary air
inlet holes on injector holder for dust
and dirt (see Figure 28).
3. Blow air through the ports/slots and
holes in the burner.
Figure 28 - Injector Holder On Outlet
Burner Tube
4. Check the injector holder located at the
end of the burner tube again. Remove
any large particles of dust, dirt, lint, or
pet hairs with a soft cloth or vacuum
cleaner nozzle.
5. Blow air into the primary air holes on
the injector holder.
6. In case any large clumps of dust have
now been pushed into the burner repeat
steps 3 and 4.
Clean the pilot assembly also. A yellow tip
on the pilot flame indicates dust and dirt in
the pilot assembly. There is a small pilot air
inlet hole about two inches from where the
pilot flame comes out of the pilot assembly
(see Figure 29). With the unit off, lightly
blowairthroughthe air inlethole.You may
blowthroughadrinkingstrawifcompressed
air is not available.
Figure 29 - Pilot Inlet Air Hole
Pilot Assembly
Pilot Air Inlet Hole
REPLACEMENT
PARTS
Note: Use only original replacement parts.
Thiswillprotectyourwarrantycoveragefor
parts replaced under warranty.
PARTS UNDER WARRANTY
Contact authorized dealers of this product.
If they can’t supply original replacement
part(s), call DESA International’s Techni-
cal Service Department at 1-800-323-5190
for referral information.
When calling DESA International, have
ready
• your name
• your address
• model and serial numbers of your heater
• how heater was malfunctioning
• type of gas used (propane/LP or natural
gas)
• purchase date
Usually,wewillaskyoutoreturnthedefec-
tive part to the factory.
PARTS NOT UNDER
WARRANTY
Contactauthorizeddealers ofthisproduct. If
theycan’tsupplyoriginalreplacementpart(s),
call DESA International’s Parts Department
at 1-800-972-7879 for referral information.
When calling DESA International, have
ready
• model number of your heater
• the replacement part number
Burner
Tube
Injector
Holder
Primary Air
Inlet Hole
Ports/Slots

20
107098
PROPANE/LP GAS RESIDENTIAL HEATERS
®
For more information, visit www.desatech.com
1
2
9
10
10
12 13
14
15
17
19
20
23
24
25
6
26
6
7
1
1
31
28
5
16 18
4
22
1 1
1
21
11
8
27
ILLUSTRATED
PARTS
BREAKDOWN
VMH3000TPA