Desa Comfort Glow S26NTA Quick start guide

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WARNING: If the information in this manual is not
followedexactly,afireorexplosionmayresultcausing
property damage, personal injury, or loss of life.
— Do not store or use gasoline or other flammable
vaporsandliquidsinthevicinityofthisoranyother
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.
• Immediatelycallyourgassupplierfromaneighbor’s
phone. Follow the gas supplier’s instructions.
• If you cannot reach your gas supplier, call the fire
department.
— Installationandservicemustbeperformedbyaquali-
fied installer, service agency, or the gas supplier.
VENT-FREE FREESTANDING PEDESTAL STOVE SYSTEM
OWNER’S OPERATION AND INSTALLATION MANUAL
THERMOSTATICALLY - CONTROLLED MODELS
S26PTA AND S26NTA
20,000 TO 26,000 BTU/HR

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2
WARNING: Improper installation, adjustment, altera-
tion, service, or maintenance can cause injury or prop-
ertydamage.Refertothismanualforcorrectinstallation
and operational procedures. For assistance or addi-
tional information consult a qualified installer, service
agency, or the gas supplier.
WARNING: This is an unvented gas-fired heater. It uses
air (oxygen) from the room in which it is installed.
Provisions for adequate combustion and ventilation air
must be provided. Refer to Air for Combustion and
Ventilation 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.
TABLE OF CONTENTS
Safety Information ............................................... 3
Product Identification .......................................... 4
Local Codes ........................................................ 5
Unpacking ........................................................... 5
Product Features ................................................ 5
Air For Combustion And Ventilation .................... 5
Installation ........................................................... 7
Operating Heater .............................................. 14
Inspecting Burners ............................................ 15
Cleaning and Maintenance ............................... 16
Specifications .................................................... 17
Service Hints ..................................................... 17
Technical Service .............................................. 17
Troubleshooting ................................................ 18
Illustrated Parts Breakdown and Parts List ....... 22
Replacement Parts ........................................... 26
Accessories....................................................... 26
Parts Central ..................................................... 27
Warranty Information.......................... Back Cover

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110361-01E 3
SAFETY INFORMATION
WARNING:Thisproductcon-
tainsand/orgenerateschemicals
known to the state of California
to cause cancer or birth defects,
or other reproductive harm.
IMPORTANT:Readthisowner’s
manualcarefullyandcompletely
beforetryingtoassemble,oper-
ate, or service this heater. Im-
proper use of this heater can
cause serious injury or death
fromburns,fire,explosion,elec-
trical shock, and carbon mon-
oxide poisoning.
DANGER:Carbonmonoxide
poisoning may lead to death!
Carbon Monoxide Poisoning: Early signs of car-
bonmonoxidepoisoningresemblethe flu,withhead-
aches, dizziness, or nausea. If you have these signs,
thefireplace may notbeworkingproperly.Getfresh
air at once! Have fireplace serviced. Some people
are more affected by carbon monoxide than others.
These include pregnant women, people with heart
or lung disease or anemia, those under the influence
of alcohol, and those at high altitudes.
Natural and Propane/LP Gas: Natural and Propane/LP
gasesareodorless.Anodor-making agent is added to
these gases. The odor helps you detect a gas leak.
However, the odor added to the gas can fade. Gas
may be present even though no odor exists.
Make certain you read and understand all warn-
ings. Keep this manual for reference. It is your
guideto safeand properoperation ofthis fireplace.
WARNING: Any change to
this fireplace or its controls can
be dangerous.
WARNING:Donotallowfans
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.
WARNING: Do not use a
blower insert, heat exchanger
insert, or other accessory not
approved for use with this
heater.
Due to high temperatures, the
applianceshouldbelocatedout
of traffic and away from furni-
ture and draperies.
Do not place clothing or other
flammable material on or near
the appliance. Never place any
objects in the fireplace.
Heater becomes very hot when
runningfireplace.Keepchildren
and adults away from hot sur-
facesto avoid burnsor clothing
ignition. Fireplace will remain
hot for a time after shutdown.
Allow surfaces to cool before
touching.
Carefully supervise young chil-
dren when they are in the room
with fireplace.
You must operate this heater
with the heater screen in place.
Make sure heater screen is in
place before running heater.
Keep the appliance area clear
and free from combustible ma-
terials,gasoline,andotherflam-
mable vapors and liquids.

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4
SAFETY INFORMATION
Continued
1. This appliance is only for use with the type of
gas indicated on the rating plate. This appli-
ance is not convertible for use with other
gases.
2. Do not place propane/LP supply tank(s) in-
side any structure. Locate propane/LP supply
tank(s) outdoors (propane/LP gas units only).
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
• if you cannot reach your gas supplier, call
the fire department
4. This heater shall not be installed in a bedroom
or bathroom.
5. Do not use this heater asawood-burningheater.
Use only the logs provided with the heater.
6. Do not add extra logs or ornaments such as
pine cones, vermiculite, or rock wool. Using
these added items can cause sooting. Do not
add lava rock around base. Rock and debris
could fall into the control area of heater.After
servicing, always replace screen before oper-
ating heater.
7. You must operate this heater with the heater
screen in place. Make sure heater screen is in
place before running heater.
8. This heater is designed tobe smokeless. If logs
ever appear to smoke, turn off heater and call
a qualified service person. Note: During ini-
tial operation, slight smoking could occur due
to log curing and heater burning manufactur-
ing residues.
9. To prevent the creation of soot, follow the
instructions in Cleaning and Maintenance,
pages 16 and 17.
10. Before using furniture polish, wax, carpet
cleaner, or similar products, turn heater off. If
heated, the vapors from these products may
create a white powder residue within burner
box or on adjacent walls or furniture.
11. This heater needs fresh air ventilation to run
properly. This heater has an Oxygen Deple-
tionSensing (ODS) safety shutoffsystem.The
ODSshuts down the heater if not enough fresh
air is available. See Air for Combustion and
Ventilation, pages 5 through 7. If heater keeps
shutting off, see Troubleshooting, pages 18
through 21.
12. Keep all air openings in front and bottom of
heater clear and free of debris. This will in-
sure enough air for proper combustion.
13. Do not run heater
• where flammable liquids or vapors are used
or stored.
• under dusty conditions.
14. Do not use this heater to cook food or burn
paper or other objects.
15. Do not use heater if any part has been under
water. Immediately call a qualified 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.
16. Turn off and unplug heater and let cool be-
fore servicing. Only a qualified service per-
son should service and repair heater.
17. Operating heater above elevations of 4,500
feet could cause pilot outage.
18. Do not operate heater if any log is broken. Do
not operate heater if a log is chipped (dime-
sized or larger).
19. To prevent performance problems with pro-
pane/LPunits, do notuse propane/LP fueltank
of less than 100 lbs. capacity.
20. Provide adequate clearances around air
openings.
PRODUCT
IDENTIFICATION
Heater Controls
(Inside Door)
Screen
Logs
Stove
Cabinet
Figure 1 - Vent-Free Freestanding
Pedestal Stove

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110361-01E 5
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, ANSI
Z223.1/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
UNPACKING
1. Remove top inner pack.
2. Tilt carton so that stove is upright.
3. Remove protective side packaging.
4. Slide stove out of carton.
5. Remove protective plastic wrap.
6. Remove screen by lifting and then pulling
forward.
7. Remove log set by cutting plastic ties.
8. Carefully unwrap log.
9. Check for any shipping damage. If stove or
logis damaged,promptly informdealer where
you bought stove.
PRODUCT FEATURES
SAFETY PILOT
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 heat-
ers. 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 re-
quires no matches, batteries, or other sources to
light heater.
AIR FOR COMBUSTION
AND VENTILATION
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.
Today’s homes are built more energy efficient than
ever. New materials, increased insulation, and new
construction methods help reduce heat loss in
homes. Home owners weather strip and caulk
around windows and doors to keep the cold air out
and the warm air in. During heating months, home
owners want their homes as airtight as possible.
While it is good to make your home energy effi-
cient, your home needs to breathe. Fresh air must
enter your home.All fuel-burning appliances need
fresh air for proper combustion and ventilation.
Exhaust fans, fireplaces, clothes dryers, and fuel
burning appliances draw air from the house to
operate. You must provide adequate fresh air for
these appliances. This will insure proper venting
of vented fuel-burning appliances.
PROVIDING ADEQUATE
VENTILATION
The following are excerpts from National Fuel
Gas Code, ANSI Z223.1/NFPA 54, Section 5.3,Air
for Combustion and Ventilation.
All spaces in homes fall into one of the three fol-
lowing 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 ven-
tilation.
Unusually Tight Construction
The air that leaks around doors and windows may
provide enough fresh air for combustion and ven-
tilation. However, in buildings of unusually tight
construction,you must provide additional freshair.

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Unusually tight construction is defined as
construction where:
a. walls and ceilings exposed to the out-
side atmosphere have a continuous
water vapor retarder with a rating of
one perm (6 x 10-11 kg per pa-sec-m2)
or less with openings gasketed or
sealed and
b. weather stripping has been added on
openable windows and doors and
c. caulking or sealants are applied to ar-
eas such as joints around window and
door frames, between sole plates and
floors, between wall-ceiling joints, be-
tween wall panels, at penetrations for
plumbing, electrical, and gas lines, and
at other openings.
If your home meets all of these three crite-
ria, you must provide additional fresh air.
See Ventilation Air From Outdoors , page 7 .
If your home does not meet all of the three
criteria above, proceed to Determining
Fresh-Air Flow For Fireplace Location .
Confined and Unconfined Space
The National Fuel Gas Code, ANSI Z223.1/NFPA
54 defines a confined space as a space whose vol-
ume is less than 50 cubic feet per 1,000 Btu per
hour (4.8 m3per kw) of the aggregate input rating
of all appliances installed in that space and an un-
confined space as a space whose volume is not less
than 50 cubic feet per 1,000 Btu per hour (4.8 m3
per kw) of the aggregate input rating of all appli-
ances installed in that space. Rooms communicat-
ing directly with the space in which the appliances
are installed*, through openings not furnished with
doors,areconsideredapartoftheunconfinedspace.
*Adjoiningrooms are communicatingonly if there
are doorless passageways or ventilation grills be-
tween them.
DETERMINING FRESH-AIR FLOW
FOR HEATER LOCATION
Determining if You Have a Confined or
Unconfined Space
Use this work sheet to determine if you have a
confined or unconfined space.
Space: Includes the room in which you will install
heater plus any adjoining rooms with doorless pas-
sageways or ventilation grills between the rooms.
AIR FOR COMBUSTION
AND VENTILATION
Continued
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. (vol-
ume of space)
If additional ventilation to adjoining room is sup-
plied with grills or openings, add the volume of
these rooms to the total volume of the space.
2. Multiply the space volume by 20 to determine
the maximum Btu/Hr the space can support.
__________ (volume of space) x 20 = (Maxi-
mum Btu/Hr the space can support)
Example: 2560 cu. ft. (volume of space) x 20 =
51,200 (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. Di-
rect-ventdrawscombustion air from the outdoors
and vents to the outdoors.
Example:
Gas water heater ______________ Btu/Hr
Vent-free fireplace ______________ Btu/Hr
Total ______________ Btu/Hr
4. Compare the maximum Btu/Hr the space can
support with the actual amount of Btu/Hr used.
________ Btu/Hr(maximumthespacecansupport)
________ Btu/Hr(actual amount of Btu/Hr used)
Example: 51,200 Btu/Hr (maximum the space
can support)
56,000 Btu/Hr (actual amount of
Btu/Hr used)
The space in the above example is a confined space
because the actual Btu/Hr used is more than the maxi-
mum Btu/Hr the space can support. You must pro-
vide additional fresh air.Your options are as follows:
A. Rework worksheet, adding the spaceofanadjoin-
ing room. If the extra space provides an uncon-
finedspace, remove door toadjoiningroom or add
ventilation grills between rooms. See Ventilation
Air From Inside Building, page 7.
B. Vent room directly to the outdoors. See Ventila-
tion Air From Outdoors, page 7.
C. Install a lower Btu/Hr heater,if lower Btu/Hr size
makes room unconfined.
30,000
+ 26,000
= 56,000

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110361-01E 7
If the actual Btu/Hr used is less than the maximum
Btu/Hr the space can support, the space is an uncon-
fined space.You will need no additional fresh air ven-
tilation.
WARNING: If the area in
which the heater may be oper-
atedissmallerthanthatdefined
asan unconfinedspace orifthe
building is of unusually tight
construction, provide adequate
combustion and ventilation air
byoneofthemethodsdescribed
in the National Fuel Gas Code,
ANSI Z223.1/NFPA 54 Section
5.3 or applicable local codes .
VENTILATION AIR
Ventilation Air From Inside Building
This fresh air would come from an adjoining un-
confined space. When ventilating to an adjoining
unconfined space, you must provide two perma-
nent openings: one within 12" of the ceiling and
one within 12" of the floor on the wall connecting
the two spaces (see options 1 and 2, Figure 2).
You canalso removedoor into adjoining room (see
option 3, Figure 2). Follow the National Fuel Gas
Code, ANS Z223.1/NFPA 54, Section 5.3, Air for
Combustion and Ventilation for required size of
ventilation grills or ducts.
AIR FOR COMBUSTION
AND VENTILATION
Continued
Ventilation Air From Outdoors
Provide extra fresh air by using ventilation grills
or ducts. You must provide two permanent open-
ings: one within 12" of the ceiling and one within
12" of the floor. Connect these items directly to
the outdoors or spaces open to the outdoors. These
spaces include attics and crawl spaces. Follow the
National Fuel Gas Code, ANS Z223.1/NFPA 54,
Section 5.3, Air for Combustion and Ventilation
for required size of ventilation grills or ducts.
IMPORTANT: Do not provide openings for inlet
or outlet air into attic if attic has a thermostat-con-
trolled power vent. Heated air entering the attic
will activate the power vent.
Figure 3 - Ventilation Air from Outdoors
Figure 2 - Ventilation Air from Inside
Building
Outlet
Air Ventilated
Attic
Outlet
Air
Inlet
Air
Inlet Air Ventilated
Crawl Space
To
Crawl
Space
To Attic
Or
Remove
Door into
Adjoining
Room,
Option
3
Ventilation Grills
Into Adjoining Room,
Option 2
Ventilation
Grills
Into Adjoining
Room,
Option 1
12"
12"
INSTALLATION
NOTICE:Thisheaterisintended
for use as supplemental heat.
Use this heater along with your
primary heating system. Do not
install this heater as your pri-
mary heat source. If you have a
centralheatingsystem,youmay
run system’s circulating blower
whileusingheater.Thiswillhelp
circulatetheheatthroughoutthe
house. In the event of a power
outage, you can use this heater
as your primary heat source.
WARNING: A qualified ser-
vice person must install heater.
Follow all local codes.

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8
12"
Minimum 12" Minimum
48"
Minimum
Ceiling
Side Wall Side Wall
WARNING: Never install the
heater
• in a bedroom or bathroom
• in a recreational vehicle
• where curtains, furniture,
clothing, or other flammable
objectsarelessthan42inches
from the front, top, or sides of
the heater
• in high traffic areas
• in windy or drafty areas
CAUTION:Thisheatercreates
warmaircurrents.Thesecurrents
moveheattowallsurfacesnextto
heater. Installing heater next to
vinyl or cloth wall coverings or
operating heater where impuri-
ties (such as, but not limited to,
tobaccosmoke,aromaticcandles,
cleaning fluids, oil or kerosene
lamps, etc.) in the air exist, may
discolor walls or cause odors.
IMPORTANT: Vent-free heaters add moisture to
the air.Although this is beneficial, installing heater
in rooms without enough ventilation air may cause
mildew to form from too much moisture. See Air
forCombustion and Ventilation, pages 5 through 7.
CHECK GAS TYPE
Usecorrectgas type (natural orpropane/LP).If your
gas supply is not correct, do not install heater. Call
dealerwhereyouboughtheaterforpropertypeheater.
WARNING: This appliance
is equipped for (natural or pro-
pane/LP) gas. Field conversion
is not permitted.
CLEARANCES TO COMBUSTIBLES
WARNING: Maintain the
minimumclearances.Ifyoucan,
providegreaterclearancesfrom
floor,ceiling,andadjoiningside
and back walls.
Carefullyfollow the instructions below. This stove
is a freestanding unit designed to set directly on
INSTALLATION
Continued
the floor. IMPORTANT: You must maintain mini-
mum wall and ceiling clearances during installa-
tion. The minimum clearances are shown in Fig-
ure 4. Measure from outermost point of stove top.
Minimum Wall and Ceiling Clearances
(see Figure 4)
A. Clearances from outermost point of stove top
to any combustible side wall should not be
less than 12 inches.
B. Clearances from outermost point of stove top
toanycombustibleback wall should notbeless
than 6 inches (Includes corner installations).
C. Clearances from the stove top to the ceiling
should not be less than 48 inches.
Figure 4 - Minimum Clearance to Walls
and Ceiling
Front View
Top View
Side View
Front of
Stove Unit
Back Wall
Side Wall Side Wall
12 "
Minimum 12
"
Minimum
6
"
Minimum
6"
Minimum
48"
Minimum
Ceiling
Floor
Back Wall
Corner
Wall
Wall
6 "
Minimum
6
"
Minimum

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110361-01E 9
CONNECTING TO GAS SUPPLY
WARNING: A qualified ser-
vicepersonmustconnectheater
to gas supply. Follow all local
codes.
CAUTION: Never connect
propane/LPheaterdirectlytothe
propane/LP supply. This heater
requires an external regulator
(not supplied). Install the exter-
nalregulatorbetweentheheater
and propane/LP supply.
WARNING: Never connect
naturalgasheatertoprivate(non-
utility)gaswells.Thisgasiscom-
monly known as wellhead gas.
Installation Items Needed
Before installing heater, make sure you have the
items listed below.
• piping (check local codes)
• sealant (resistant to propane/LP gas)
• equipment shutoff valve *
• test gauge connection *
• sediment trap
• tee joint
• pipe wrench
* An CSA design-certified equipment shutoff
valve with 1/8" NPT tap is an acceptable alterna-
tiveto test gaugeconnection. Purchasethe optional
CSA design-certified equipment shutoff valve
from your dealer. See Accessories, page 26.
For propane/LP units, the installer must supply an
external regulator. The external regulator will re-
duce incoming gas pressure. You must reduce in-
coming gas pressure to between 11 and 14 inches
of water. If you do not reduce incoming gas pres-
sure, heater regulator damage could occur. Install
external regulator with the vent pointing down as
shown in Figure 6. Pointing the vent down pro-
tects it from freezing rain or sleet.
INSTALLATION
Continued
Figure 5 - Gas Regulator Location and
Gas Line Access Into Stove Cabinet
Front of
Stove
Unit
Gas Regulator
Inlet Connection
Side View
Figure 6 - External Regulator With Vent
Pointing Down
Propane/LP
Supply Tank External
Regulator
Vent
Pointing
Down
CAUTION:Useonlynew,black
ironorsteelpipe.Internally-tinned
copper tubing may be used in
certain areas. Check your local
codes. Use pipe of 1/2" diameter
or greater to allow proper gas
volume to heater. If pipe is too
small,unduelossofvolumewill
occur.
Installation must include an equipment shutoff
valve, union, and plugged 1/8" NPT tap. Locate
NPT tap within reach for test gauge hook up. NPT
tap must be upstream from heater (see Figure 7,
page 10).
IMPORTANT: Install equipment shutoff valve in
an accessible location. The equipment shutoff
valve is for turning on or shutting off the gas to
the appliance.
Checkbuilding codes for any special requirements
for locating equipment shutoff valve to fireplaces.
Apply pipe joint sealant lightly to male NPT
threads. This will prevent excess sealant from go-
ing into pipe. Excess sealant in pipe could result
in clogged heater valves.

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10
WARNING: Use pipe joint
sealantthatisresistanttoliquid
petroleum (LP) gas.
We recommend that you install a sediment trap in
supply line as shown in Figure 7. Locate sediment
trap where it is within reach for cleaning. Install
in piping system between fuel supply and heater.
Locate sediment trap where trapped matter is not
likely to freeze. A sediment trap traps moisture
andcontaminants.Thiskeeps them fromgoing into
heater controls. If sediment trap is not installed or
is installed wrong, heater may not run properly.
CAUTION: Avoid damage to
regulator. Hold gas regulator
withwrench whenconnecting it
to gas piping and/or fittings.
INSTALLATION
Continued
Propane/LP
From External Regulator
(11" W.C.** to 14" W.C.
Pressure)
Natural
From Gas Meter
(5" W.C.** to
10.5" W.C.
Pressure)
CSA Design-
Certified Equipment
Shutoff Valve With
1/8" NPT Tap*
Figure 7 - Gas Connection
* Purchase the optional CSA design-certified
equipment shutoff valve from your dealer. See
Accessories, page 26.
** Minimum inlet pressure for purpose of input
adjustment.
Tee
Joint
Pipe
Nipple
Cap
3"
Min
Sediment Trap
Gas
Regulator
of Heater
Approved
Flexible Gas
Hose (if allowed
by local codes)
CHECKING GAS CONNECTIONS
WARNING: Test all gas pip-
ing and connections, internal
and external or unit, for leaks
afterinstallingorservicing.Cor-
rect all leaks at once.
WARNING: Never use an
open flame to check for a leak.
Apply a noncorrosive leak de-
tectionfluidtoalljoints.Bubbles
forming show a leak. Correct all
leaks at once.
CAUTION: Make sure exter-
nal regulator has been installed
betweenpropane/LPsupplyand
heater. See guidelines under
Connecting to Gas Supply ,
pages 9 and 10.
Pressure Testing Gas Supply Piping
System
Test Pressures In Excess Of 1/2 PSIG
(3.5 kPa)
1. Disconnect heater with its appliance main gas
valve (control valve) and equipment shutoff
valve from gas supply piping system. Pres-
sures in excess of 1/2 psig will damage heater
regulator.
2. Cap off open end of gas pipe where equip-
ment shutoff valve was connected.
3. Pressurize supply piping system by either
opening propane/LP supply tank valve for
propane/LP gas, opening main gas valve lo-
cated on or near gas meter for natural gas, or
using compressed air.
4. Check all joints of gas supply piping system.
Applynoncorrosive leak detection fluid to gas
joints. Bubbles forming show a leak.
5. Correct all leaks at once.
6. Reconnect heater and equipment shutoff
valve to gas supply. Check reconnected fit-
tings for leaks.
Test Pressures Equal To or Less Than 1/2 PSIG
(3.5 kPa)
1. Close equipment shutoff valve (see Figure 8,
page 11).

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110361-01E 11
INSTALLATION
Continued
2. Pressurize supply piping system by either
opening propane/LP supply tank valve for
propane/LP gas, opening main gas valve lo-
cated on or near gas meter for natural gas, or
using compressed air.
3. Check all joints from gas meter to equipment
shutoff valve (see Figures 9 and 10). Apply
noncorrosiveleak detection fluid to gas joints.
Bubbles forming show a leak.
4. Correct all leaks at once.
Pressure Testing Heater Gas
Connections
1. Open equipment shutoff valve (see Figure 8).
2. Open main gas valve located on or near gas
meter for natural gas or open propane/LP sup-
ply tank valve for propane/LP gas.
3. Make sure control knob of heater is in the OFF
position.
4. Check all joints from equipment shutoff valve
to control valve (see Figures 9 and 10).Apply
noncorrosiveleak detection fluid to gas joints.
Bubbles forming show a leak.
5. Correct all leaks at once.
6. Light heater (see Operating Heater, pages 14
and 15). Check all other internal joints for
leaks.
7. Turn off heater (see To Turn Off Gas toAppli-
ance, page 15).
O
N
POSI
T
O
PO
S
Figure 8- Equipment Shutoff Valve
Closed
Equipment
Shutoff Valve Open
Figure 9 - Checking Gas Joints
Control Valve
Location
Propane/LP
Supply Tank
Equipment Shutoff Valve
Figure 10 - Checking Gas Joints
Gas Meter
Equipment
Shutoff
Valve
Control Valve
Location
INSTALLING LOGS
WARNING:Failuretoposition
thepartsinaccordancewiththese
diagrams or failure to use only
parts specifically approved with
thisheatermayresultinproperty
damage or personal injury.
CAUTION: After installation
and periodically thereafter,
check to ensure that no flame
comes in contact with any log.
WiththeheatersettoHigh,check
to see if flames contact any log.
If so, reposition logs according
to the log installation instruc-
tionsinthismanual.Flamescon-
tacting logs will create soot.
It is very important to install the logs exactly as
instructed. Do not modify logs. Only use logs sup-
plied with heater.
Place one-piece log set on grate to fit as illustrated
in Figure 11. Make sure log sits flat on firebox
floor (see Figure 11).
O
F
F
P
I
L O
T
O
N
H
I
L
O
Figure 11 - Installing One-Piece Log Set
One Piece
Log Set
Firebox
Floor

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12
INSTALLATION
Continued
IMPORTANT: Make sure log does not cover any
burner ports (see Figure 12).
Figure 12 - Installing One-Piece Log set
(Top View)
One Piece
Log Set
Burner Ports
INSTALLING BLOWER ACCESSORY
GA3750
Tools required: Phillips screwdriver
NOTICE:Shutoffgasheaterdur-
ing the following blower instal-
lation.
1. Remove top panel of stove by removing three
screwsfrom under top lip oneach side of stove
(see Figure 13).
2. Facing front of stove, carefully slide top panel
forward until it is completely removed from
stove (see Figure 13).
3. Disconnect power cord wires from blower
motor (if connected) (see Figure 14).
4. Disconnect green ground wire from blower
housing (if connected) by removing screw
holding wire terminal (see Figure 14).
5. Install one plastic bushing provided in blower
kit into the 1 1/2" hole in the left rear of fire-
box floor. Access hole through the rectangu-
lar opening in the rear panel (see Figure 15).
6. Remove the two blower mounting brackets
from the rear panel by removing two screws
each (see Figure 16, page 13).
7. Attach the two mounting brackets to blower
housing using four screws provided in blower
kit(2 for eachbracket) (see Figure16, page 13).
Tighten screws securely. Place blower assem-
bly temporarily on top of firebox.
8. Working from the rear of the stove, place en-
tire power cord, including speed control hous-
ing, in lower control compartment.
9. Route ends of 3-wire power cord up from the
lower control compartment through the plas-
ticbushing, then up tothe upper cavityof stove
(see Figure 17, page 13).
10. Attach the terminal ends ofthe white andblack
power cord wires to the terminals on the
blower motor (see Figure 14). Push firmly.
11. Attach the terminal end of the green power
cord wire to the front tab of the blower hous-
ing using screw provided (see Figure 14).
Figure 13 - Removing Stove Top Panel
Figure 14 - Removing Wires from Blower
Figure 15 - Installing Bushing
Screw
Green Ground Wire
White
Powercord
Wire
Black Powercord Wire
Bushing

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110361-01E 13
INSTALLATION
Continued
Figure 16 - Removing Blower Brackets
from Stove and Attaching to Blower
Blower Blower Bracket
Firebox
Top
12. Using the four screws previously removed,
mount blower assembly to stove by reattach-
ing blower brackets to rear panel (see Fig-
ure 16). Tighten screws securely.
13. Install plastic control knobonto output shaft of
speed control housing (see Figure 17). Place
speed control housing just inside control com-
partmentdoor in front of stove(see Figure 17).
14. Using two screws provided in blower kit,
mountblower speed controlhousing to mount-
ing tab in left side of lower control compart-
ment (see Figure 18).
15. Check to make sure that the power cord is
completely clear of blower wheel and there
are no foreign objects in blower wheel.
16. Carefully replace stove top panel.Align holes
and replace six screws removed in step 1,
page 12.
17. Peel off the backing paper and stick the sup-
plied wiring diagram decal on the stove floor
as shown in Figure 18.
18. Plug power cord into a convenient 3-prong
grounded wall receptacle near the stove.
WARNING: Electrical
GroundingInstructions:Thisap-
plianceis equipped with a three-
prong (grounding) plug for your
protectionagainstshockhazard
and should be plugged directly
into a properly grounded three-
prong receptacle.
19. Using speed control knob, turn blower on and
check for operation.
20. All remaining parts from blower kit may be
discarded.
Figure 17 - Installing Blower Control
Housing
Power
Cord
Speed
Control
Housing
Control
Knob
Figure 18 - Routing Power Cord
Blower Speed
Control Housing
Wiring Diagram Decal
120 Vac.
60 Hz. .
78Amps
Variable
Fan Switch
WhiteWhite
Black
Green
On
110/115
V.A.C.
Blower
Motor
Black
Black Black
Off
WARNING: Never attempt to ser-
vice heater while it is plugged in, op-
erating, or hot. Burns and electrical
shock could result. Only a qualified
service person should service or re-
pair heater.
If any of the original wire as supplied with
the appliance must be replaced, it must be
replaced with 105°C wire or it’s equivalent.
WARNING:Label all wires prior
to disconnection when servicing
controls. Wiring errors can cause
improper and dangerous opera-
tion. Verify proper operation after
servicing.
DESA Heating Products, Bowling Green, KY

www.desatech.com 110361-01E
14
OPERATING HEATER
FOR YOUR SAFETY
READ BEFORE LIGHTING
WARNING: If you do not fol-
low these instructions exactly,
a fire or explosion may result
causing property damage, per-
sonal injury or loss of life.
A. This appliance has a pilot which must be
lighted by hand. When lighting the pilot,
follow these instructions exactly.
B. BEFORELIGHTING smell all aroundthe
applianceareafor gas.Be suretosmell next
tothefloor becausesomegas isheavierthan
air and will settle on the floor.
WHAT TO DO IFYOU SMELL GAS
• Do not try to light any appliance.
• Do not touch any electric 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.
• If youcannot reach yourgas supplier, call
the fire department.
C. Use only your hand to push in or turn the
gas control knob. Never use tools. If the
knobwillnot pushin orturn byhand, don’t
tryto repairit, call a qualifiedservice tech-
nician or gas supplier. Force or attempted
repair may result in a fire or explosion.
D. Do not use this appliance if any part has
beenunderwater. Immediatelycall a quali-
fied service technician to inspect the appli-
ance and to replace any part of the control
system and any gas control which has been
under water.
LIGHTING
INSTRUCTIONS
NOTICE:Duringinitialoperation
of new heater, burning logs will
give off a paper-burning smell.
Orangeflamewillalsobepresent.
Open a window to vent smell.
This will only last a few hours.
1. STOP!Readthe safety information,above.
2. Make sure equipment shutoff valve is fully
open.
3. Turncontrol knobclockwise tothe
OFF position.
4. Wait five (5) minutes to clear out any gas.
Thensmell forgas,including nearthe floor.
If you smell gas, STOP! Follow “B” in the
safety information, column 1. If you don’t
smell gas, go to the next step.
5. Turncontrolknobcounterclockwise
tothePILOTposition.Pressincontrolknob
for five (5) seconds (see Figure 19).
Note: You may be running this heater for
the first time after hooking up to gas sup-
ply. If so, the control knob may need to be
pressed in for30 seconds ormore.This will
allow air to bleed from the gas system.
6. Withcontrol knobpressedin, pressandre-
lease ignitor button. This will light pilot.
The pilot is attached to the front burner. If
needed, keep pressing ignitor button until
pilot lights.
Note: If pilot does not stay lit, contact a
qualified service person or gas supplier for
repairs. Until repairs are made, light pilot
with match. To light pilot with match, see
Manual Lighting Procedure, page 15.
7. Keep control knob pressed in for 30 sec-
onds after lighting pilot. After 30 seconds,
release control knob.
• If control knob does not pop out when re-
leased, contact a qualified service person
or gas supplier for repairs.
Note: If pilot goes out, repeat steps 3
through 7. This heater has a safety inter-
lock system. Wait one (1) minute for sys-
tem to reset before lighting pilot again.
8. Turn control knob counterclockwise
to desired heating level. The burn-
ers should light. Set control knob to any
heat level between HI and LO.
CAUTION: Do not try to ad-
just heating levels by using the
equipment shutoff valve.
Figure 19 - Control Knob and Ignitor
Button Location
Control Knob
Ignitor Button

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110361-01E 15
Figure 20 - Pilot
Thermocouple Pilot Burner
Ignitor Electrode
OPERATING HEATER
Continued
INSPECTING BURNERS
Check pilot flame pattern and burner flame pat-
terns often.
PILOT FLAME PATTERN
Figure21shows a correct pilotflamepattern. Figure
22shows an incorrectpilot flamepattern.The incor-
TO TURN OFF GAS
TO APPLIANCE
Shutting Off Heater
Turn control knob clockwise to the
OFF position.
Shutting Off Burners Only (pilot stays lit)
Turn control knob clockwise to the PI-
LOT position.
THERMOSTAT CONTROL
OPERATION
The thermostat control knob can be set to any
comfort level between HI and LO. The ther-
mostat will gradually modulate the heat out-
put and flame height from higher to lower set-
tings,or pilot, in order to maintain the comfort
level you select. The ideal comfort setting will
varyby household dependingupon the amount
of space to be heated, the output of the central
heating system, etc.
Note: Selecting the HI setting with the control
knob will cause the burners to remain fully on,
without modulating down in most cases.
MANUAL LIGHTING
PROCEDURE
1. Followsteps 1 through5underLighting In-
structions, page 14.
2. Depress control knob and light pilot with
match.
3. Keep control knob pressed in for 30 sec-
onds after lighting pilot. After 30 seconds,
release control knob. Now follow step 8
Lighting Instructions, page 14
rect pilot flame is not touching the thermocouple.
This will cause the thermocouple to cool. When the
thermocouple cools, the heater will shut down.
If pilot flame pattern is incorrect, as shown in Fig-
ure 22
• turnheateroff(seeTo Turn Off GastoAppliance)
• see Troubleshooting, pages 18 through 21
Note: The correct pilot flame on natural gas units
will have a slight curve, but flame should be blue
an have no yellow or orange color.
Figure 21 - Correct Pilot Flame Pattern
(Natural Gas Shown)
Figure 22 - Incorrect Pilot Flame Pattern
(Natural Gas Shown)
Thermocouple Pilot Burner
Thermocouple Pilot Burner
Figure 23 - Correct Flame Pattern with
Control Knob Set to High Flame
Figure 24 - Incorrect Flame Pattern with
Control Knob Set to High Flame
Approx.
3-6"
Above
Top of
Logs
More
Than 8"
Above
Top of
Logs
BURNER FLAME PATTERN
Figure 23 shows a correct burner flame pattern.
Figure 24 shows an incorrect burner flame pat-
tern. If burner flame pattern is incorrect,
• turnheateroff(seeTo Turn Off GastoAppliance)
• see Troubleshooting, pages 18 through 21

www.desatech.com 110361-01E
16
CLEANING AND
MAINTENANCE
WARNING: Turn off heater
and let cool before cleaning.
CAUTION: You must keep
control areas, burner, and cir-
culating air passageways of
heater clean. Inspect these ar-
eas of heater before each use.
Haveheaterinspectedyearlyby
a qualified service person.
Heater may need more frequent
cleaning due to excessive lint
from carpeting, bedding mate-
rial, pet hair, etc.
WARNING: Failure to keep
theprimaryairopening(s)ofthe
burner(s) clean may result in
sooting and property damage.
BURNER INJECTOR HOLDER AND
PILOT AIR INLET HOLE
Theprimary air inlet holesallow the properamount
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 create
soot. We recommend that you clean the unit every
three months during operation and have heater in-
spected yearly by a qualified service person.
We also recommend that you keep the burner tube
and pilot assembly clean and free of dust and dirt.
To clean these parts we recommend using com-
pressedair no greater than 30 PSI.Yourlocal com-
puter store, hardware store, or home center may
carry compressed air in a can. You can use a
vacuumcleaner inthe blow position. If using com-
pressed air in a can, please follow the directions
on the can. If you don't follow directions on the
can, you could damage the pilot 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 25).
3. Blow air through the ports/slots and holes in
the burner.
4. Check the injector holder located at the end
of the burner tube again. Remove any large
particles of dust, dirt, lint, or pet hair with a
soft cloth or vacuum cleaner nozzle.
5. Blow air into the primary air holes on the in-
jector holder.
6. In case anylargeclumps of dusthavenow been
pushed into the burner repeat steps 3 and 4.
Clean the pilot assembly also.Ayellow tip on the
pilot flame indicates dust and dirt in the pilot as-
sembly. There is a small pilot air inlet hole about
two inches from where the pilot flame comes out
of the pilot assembly (see Figure 26). With the
unit off, lightly blow air through the air inlet hole.
You may blow through a drinking straw if com-
pressed air is not available.
Figure 25 - Injector Holder On Outlet
Burner Tube
Figure 26 - Pilot Inlet Air Hole
Burner
Tube
Pilot
Assembly
Pilot Air
Inlet Hole
Ports/Slots
Burner
Tube
Injector Holder (May
Be Brass or Aluminum
Depending on Model)
Primary Air Inlet Holes (Shape
of Holes May Vary by Model)

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110361-01E 17
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 cabinet to remove
dust.
LOGS
• If you remove logs for cleaning, refer to In-
stalling Logs, pages 11 and 12, to properly re-
place logs.
• Replacelog(s) ifbroken orchipped (dime-sized
or larger).
MAIN BURNER
Periodically inspect all burner flame holes with
the heater running.All slotted burner flame holes
should be open with yellow flame present. All
round burner flame holes should be open with a
smallblue flame present. Some burner flame holes
may become blocked by debris or rust, with no
flame present. If so, turn off heater and let cool.
Remove blockage. Blocked burner flame holes
will create soot.
CLEANING AND
MAINTENANCE
Continued
SPECIFICATIONS
S26PTA S26NTA
Btu (Variable) 20,000/26,000 20,000/26,000
Type Gas Propane/LP Only Natural Only
Ignition Piezo Piezo
Manifold Pressure 8" W.C. 3.0" W.C.
Inlet Gas Pressure (in. of water) *
Maximum 14" 10.5"
Minimum 11" 5"
Dimensions, Inches (H x W x D)
Stove 24 x 27 1/4x 17 1/424 x 27 1/4x 17 1/4
Carton 22 x 31 x 31 1/222 x 31 x 31 1/2
Weight, pounds
Stove 66 lbs. 66 lbs.
Shipping 80 lbs. 80 lbs.
* For purposes of input adjustment
SERVICE HINTS
When Gas Pressure Is Too Low
• pilot will not stay lit
• burners will have delayed ignition
• heater will not produce specified heat
• propane/LP gas supply may be low
You may feel your gas pressure is too low. If so,
contact your local gas supplier.
TECHNICAL SERVICE
You may have further questions about installation,
operation, or troubleshooting. If so, contact DESA
Heating Products’Technical Service Department
at1-866-672-6040.When calling, pleasehaveyour
model and serial numbers of your heater ready.
You can also visit DESA Heating Products’ tech-
nical services web site at www.desatech.com.

www.desatech.com 110361-01E
18
TROUBLESHOOTING
Note: All troubleshooting items are listed in order of operation.
WARNING: Turn off heater and let cool before servicing. Only a
qualified service person should service and repair heater.
CAUTION: Never use a wire, needle, or similar object to clean
ODS/pilot. This can damage ODS/pilot unit.
POSSIBLE CAUSE
1. Ignitor electrode not con-
nected to ignitor cable
2. Ignitor cable pinched or wet
3. Piezo ignitor nut is loose
4. Broken ignitor cable
5. Bad piezo ignitor
6. Ignitor electrode broken
7. 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. Depleted gas supply, propane/
LP only
6. ODS/pilot is clogged
7. Gas regulator setting is not
correct
REMEDY
1. Reconnect ignitor cable
2. Free ignitor cable if pinched
by any metal or tubing. Keep
ignitor cable dry
3. Tighten nut holding piezo ig-
nitor to base panel of log set.
Nut is located behind base
panel
4. Replace ignitor cable
5. Replace piezo ignitor
6. Replace pilot assembly
7. Replace pilot assembly
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 con-
trol knob. Repeat igniting op-
eration until air is removed
5. Contact local propane/LP gas
company
6. Clean ODS/pilot (see Clean-
ing and Maintenance, pages
16 and 17) or replace ODS/pi-
lot assembly
7. Replace gas control
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

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110361-01E 19
TROUBLESHOOTING
Continued
POSSIBLE CAUSE
1. Controlknob not fullypressedin
2. Control knob not pressed in
long enough
3. Equipment shutoff valve not
fully open
4. Pilot flame not touching ther-
mocouple, which allows ther-
mocouple to cool, causing pi-
lot 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
5. Thermocouple connection
loose at control valve
6. Thermocouple damaged
7. Control valve damaged
1. Burner orifice clogged
2. Inlet gas pressure is too low
3. Thermopile leads discon-
nected or improperly con-
nected
4. Burners will not come on in
remote position
1. Manifold pressure is too low
2. Burner orifice clogged
1. Burner orifice is clogged or
damaged
2. Damaged burner
3. Gas regulator defective
1. Not enough air
2. Gas regulator defective
3. Residues from manufacturing
processes and logs curing
1. Not enough combustion/ven-
tilation air
REMEDY
1. Press in control knob fully
2. AfterODS/pilotlights,keepcon-
trol knob pressed in 30 seconds
3. Fully open equipment shutoff
valve
4. A) Contact local gas company
B) Clean ODS/pilot (see
Cleaning and Maintenance,
pages 16 and 17) or replace
ODS/pilot assembly
5. Hand tighten until snug, then
tighten 1/4 turn more
6. Replace pilot assembly
7. Replace control valve
1. Clean burner (seeCleaningand
Maintenance, pages 16 and 17)
or replace burner orifice
2. Contact local gas company
3. Reconnect leads (see wiring
diagram)
4. Replace battery in transmitter
and receiver
1. Contact local gas company
2. Cleanburner(seeCleaningand
Maintenance, pages 16 and 17)
or replace burner orifice
1. Cleanburner(seeCleaningand
Maintenance, pages 16 and 17)
or replace burner orifice
2. Replace damaged burner
3. Replace gas control
1. Check burner for dirt and de-
bris. If found, clean burner
(see Cleaning and Mainte-
nance, pages 16 and 17)
2. Replace gas control
3. Problem will stop after a few
hours of operation
1. Refer to Air for Combustion
and Ventilation requirements
(page 5)
OBSERVED PROBLEM
ODS/pilotlights butflamegoes
out when control knob is re-
leased
BurnerdoesnotlightafterODS/
pilot is lit
Delayed ignition burner
Burner backfiring during com-
bustion
Slightsmokeorodorduringini-
tial operation
Moisture/condensation noticed
on windows

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20
TROUBLESHOOTING
Continued
POSSIBLE CAUSE
1. Turningcontrol knobto HI po-
sition when burner is cold
2. Air in gas line
3. Air passageways on heater
blocked
4. Dirty or partially clogged
burner orifice
1. Improper log placement
2. Drafts or other air currents af-
fecting flame pattern
3. Air holes at burner inlet
blocked
4. Burner flame holes blocked
1. When heated, vapors from fur-
niture polish, wax, carpet
cleaners, etc. may turn into
white powder residue
1. Metal expanding whileheating
or contracting while cooling
REMEDY
1. Turn control knob to LO po-
sition and let warm up for a
minute
2. Operate burner until air is re-
movedfromline.Havegasline
checked by local gas company
3. Observe minimum installation
clearances (see page 8)
4. Clean burner (seeCleaningand
Maintenance, pages 16 and 17)
or replace burner orifice
1. Properly locate logs (see In-
stallingLogs,pages 11and 12)
2. Eliminate source of drafts
around heater
3. Clean out air holes at burner
inlet. Periodically repeat as
needed
4. Remove blockage or replace
burner
1. Turn heater off when using
furniture polish, wax, carpet
cleaners, or similar products
1. Thisiscommonwithmost heat-
ers. If noise is excessive, con-
tact qualified service person
OBSERVED PROBLEM
Heater produces a whistling
noise when burner is lit
Darkresidueonlogsorinsideof
fireplace
White powder residue forming
within burner box or on adja-
cent walls or furniture
Heaterproducesaclicking/tick-
ing noise just after burner is lit
or shut off