Comfort Glow S39PT Quick start guide

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WARNING: If the information in this manual is not fol-
lowed exactly, a fire or explosion may result causing
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.
• If you cannot reach your gas supplier, call the fire
department.
— Installation and service must be performed by a quali-
fied installer, service agency or the gas supplier.
S39PT AND S39NT
20,000 TO 39,000 BTU/HR THERMOSTATICALLY- CONTROLLED
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VENT-FREE FREESTANDING PEDESTAL STOVE SYSTEM
OWNER’S OPERATION AND INSTALLATION MANUAL

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WARNING: Improper installation, adjustment, altera-
tion, service or maintenance can cause injury or prop-
erty damage. Refer to this manual for correct installation
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. Provi-
sions 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,* per-
manently located, manufactured (mobile) home, where
not prohibited by local codes.
This appliance is only for use with the type of gas indi-
cated on the rating plate. This appliance is not convert-
ible for use with other gases.
* Aftermarket: Completion of sale, not for purpose of resale, from the manufacturer
State of Massachusetts: The installation must be made by a licensed plumber or gas fitter in the
Commonwealth of Massachusetts.
Sellers of unvented propane or natural gas-fired supplemental room heaters shall provide to each
purchaser a copy of 527 CMR 30 upon sale of the unit.
Vent-free gas products are prohibited for bedroom and bathroom installation in the Common-
wealth of Massachusetts.
TABLE OF CONTENTS
Safety Information ............................................... 3
Product Identification ........................................... 4
Local Codes ........................................................ 5
Unpacking ........................................................... 5
Product Features ................................................. 5
Air For Combustion and Ventilation ..................... 5
Installation ........................................................... 8
Operating Heater ............................................... 16
Inspecting Burners ........................................... 18
Cleaning and Maintenance ................................ 19
Specifications .................................................... 20
Service Hints ..................................................... 20
Technical Service .............................................. 20
Replacement Parts ............................................ 20
Troubleshooting ................................................. 21
Parts Centrals .................................................... 25
Illustrated Parts Breakdown and Parts List ....... 26
Accessories ....................................................... 30
Warranty Information ...........................Back Cover

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111417-01B 3
SAFETY INFORMATION
WARNING: This product con-
tains and/or generates chemicals
known to the State of California
to cause cancer or birth defects
or other reproductive harm.
IMPORTANT: Read this owner’s
manual carefully and completely
before trying to assemble, op-
erate or service this fireplace.
Improper use of this fireplace
can cause serious injury or
death from burns, fire, explo-
sion, electrical shock and carbon
monoxide poisoning.
DANGER: Carbon monoxide
poisoning may lead to death!
Carbon Monoxide Poisoning: Early signs of carbon
monoxide poisoning resemble the flu, with head-
aches, 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, 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 pro-
pane/LP gases are odorless. An odor-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
guide to safe and proper operation of this heater.
WARNING: Any change to
this stove or its controls can be
dangerous.
WARNING: Do not use a
blower insert, heat exchanger
insert or other accessory not ap-
proved for use with this heater.
WARNING: Do not allow fans
to blow directly into the heater.
Avoid any drafts that alter burner
flame patterns. Ceiling fans can
create drafts that alter burner
flame patterns. Altered burner
patterns can cause sooting.
Due to high temperatures, the
appliance should be located out
of traffic and away from furniture
and draperies.
Do not place clothing or other
flammable material on or near
the appliance. Never place any
objects on the stove.
Heater becomes very hot when
running stove. Keep children
and adults away from hot sur-
face to avoid burns or clothing
ignition. Stove will remain hot
for a time after shutdown. Al-
low surfaces to cool before
touching.
Carefully supervise young chil-
dren when they are in the room
with stove.
You must operate this heater
with a 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 and other flam-
mable vapors and liquids.

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1. This appliance is only for use with the type
of gas indicated on the rating plate. This ap-
pliance 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 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 neighborʼs phone. Follow the gas
supplierʼs 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 as a wood-burning
heater. 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
operating heater.
7. You must operate this heater with the heater
screen in place. Make sure heater screen is in
place before running heater.
8. To prevent the creation of soot, follow the
instructions in Cleaning and Maintenance,
page 19.
9. 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.
10. This heater needs fresh air ventilation 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, page 5. If heater keeps shutting
off, see Troubleshooting, page 21.
SAFETY INFORMATION
Continued
11. Do not run heater
• where flammable liquids or vapors are
used or stored.
• under dusty conditions.
12. Do not use this heater to cook food or burn
paper or other objects.
13. 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.
14. Turn off and unplug heater and let cool before
servicing. Only a qualified service person
should service and repair heater.
15. Operating heater above elevations of 4,500
feet could cause pilot outage.
16. Do not operate heater if any log is broken. Do
not operate heater if a log is chipped (dime-
sized or larger).
17. To prevent performance problems, do not use
propane/LP fuel tank of less than 100 lbs.
capacity (propane/LP only).
18. Provide adequate clearances around air
openings.
PRODUCT
IDENTIFICATION
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Figure 1 - Vent-Free Gas Pedestal Stove
Heater Controls
(Inside Door)
Screen
Logs
Stove
Cabinet

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111417-01B 5
LOCAL CODES
Install and use heater with care. Follow all local
codes. In the absence of local codes, use the lat-
est 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
This heater is designed for vent-free operation.
State and local codes in some areas prohibit the
use of vent-free heaters.
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
log is damaged, promptly inform dealer where
you bought stove.
PRODUCT FEATURES
SAFETY PILOT
This heater has a pilot with an Oxygen Deple-
tion 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 re-
quires no matches, batteries or other sources to
light heater.
AIR FOR COMBUSTION
AND VENTILATION
WARNING: This heater shall
not be installed in a confined
space or unusually tight con-
struction unless provisions are
provided for adequate combus-
tion and ventilation air. Read the
following instructions to insure
proper fresh air for this and
other fuel-burning appliances
in your home.
Todayʼs 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 efficient,
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
ventilation.
Unusually Tight Construction
The air that leaks around doors and windows
may provide enough fresh air for combustion and
ventilation. However, in buildings of unusually
tight construction, you must provide additional
fresh air.

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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
areas such as joints around window
and door frames, between sole plates
and floors, between wall-ceiling joints,
between wall panels, at penetrations
for plumbing, 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
criteria above, proceed to Determining
Fresh-Air Flow For Heater Location.
Confined and Unconfined Space
The National Fuel Gas Code, ANSI Z223.1/NFPA
54 defines a confined space as a space whose
volume is less than 50 cubic feet per 1,000 Btu
per hour (4.8 m3 per kw) of the aggregate input
rating of all appliances installed in that space and
an unconfined 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 appliances installed in that space. Rooms com-
municating directly with the space in which the
appliances are installed*, through openings not
furnished with doors, are considered a part of the
unconfined space.
* Adjoining rooms are communicating only if
there are doorless passageways or ventilation grills
between 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.
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) = 2,560 cu. ft.
(volume of space)
If additional ventilation to adjoining room is
supplied with grills or openings, add the volume
of these rooms to the total volume of the space.
2. Multiply the space volume by 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: 2,560 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-vent draws combustion 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 (maximum the space can support)
_________ Btu/Hr (actual amount of Btu/Hr used)
Example: 51,200 Btu/Hr (maximum the space
can support)
69,000 Btu/Hr (actual amount of
Btu/Hr used)
The space in the example is a confined space because
the actual Btu/Hr used is more than the maximum
Btu/Hr the space can support. You must provide ad-
ditional fresh air. Your options are as follows:
A. Rework worksheet, adding the space of an adjoin-
ing room. If the extra space provides an unconfined
space, remove door to adjoining room 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 fireplace, if lower Btu/Hr
size makes room unconfined.
30,000
39,000
69,000
AIR FOR COMBUSTION
AND VENTILATION
Continued

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111417-01B 7
AIR FOR COMBUSTION
AND VENTILATION
Continued
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
ventilation.
WARNING: If the area in
which the heater may be oper-
ated is smaller than that defined
as an unconfined space or if the
building is of unusually tight
construction, provide adequate
combustion and ventilation air
by one of the methods described
in the National Fuel Gas Code,
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 permanent
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
can also remove door into adjoining room (see
option 3, Figure 2). Follow the National Fuel Gas
Code, ANSI Z223.1/NFPA 54, Section 5.3, Air for
Combustion and Ventilation for required size of
ventilation grills or ducts.
Figure 2 - Ventilation Air from Inside
Building
Or
Remove
Door into
Adjoining
Room,
Option
3
Ventilation Grills
Into Adjoining Room,
Option 2
Ventilation
Grills
Into Adjoining
Room,
Option 1
12"
12"
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Outlet
Air
Ventilated
Attic
Outlet
A
ir
Inlet
Air
Inlet Air Ventilated
Crawl Space
To
Crawl
Space
To Attic
Figure 3 - Ventilation Air from Outdoors
Ventilation Air From Outdoors
Provide extra fresh air by using ventilation grills or
ducts. You must provide two permanent openings:
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, ANSI 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-
controlled power vent. Heated air entering the attic
will activate the power vent.

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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
for Combustion and Ventilation, page 5.
CHECK GAS TYPE
Use the correct gas type (natural or propane/LP)
for your unit. If your gas supply is not correct, do
not install heater. Call dealer where you bought
heater for proper type heater.
WARNING: This appliance
is equipped for (natural or pro-
pane/LP) gas. Field conversion
is not permitted.
CLEARANCES TO COMBUSTIBLES
(Vent-Free Operation Only)
WARNING: Maintain the
minimum clearances. If you can,
provide greater clearances from
floor, ceiling and adjoining side
and back walls.
Carefully follow the instructions below. This stove
is a freestanding unit designed to set directly on the
floor. IMPORTANT: You must maintain minimum
wall and ceiling clearances during installation. The
minimum clearances are shown in Figure 4, page 9.
Measure from outermost point of stove top.
Minimum Wall and Ceiling Clearances
(see Figure 4, page 9)
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
to any combustible back wall should not be less
than 6 inches (Includes corner installations).
C. Clearances from the stove top to the ceiling
should not be less than 48 inches.
INSTALLATION
NOTICE: This heater is intended
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
central heating system, you may
run system’s circulating blower
while using heater. This will help
circulate the heat throughout the
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.
WARNING: Never install the
heater
• in a bedroom or bathroom
• in a recreational vehicle
• where curtains, furniture, cloth-
ing or other flammable objects
are less than 42 inches from the
front, top or sides of the heater
• in high traffic areas
• in windy or drafty areas
CAUTION: This heater cre-
ates warm air currents. These
currents move heat to wall sur-
faces next to heater. Installing
heater next to vinyl or cloth wall
coverings or operating heater
where impurities (such as, but
not limited to, tobacco smoke,
aromatic candles, cleaning flu-
ids, oil or kerosene lamps, etc.) in
the air exist, may discolor walls
or cause odors.

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111417-01B 9
6"
Minimum
48"
Minimum
Ceiling
Floor
Back Wall
12"
Minimum
12"
Minimum
48"
Minimum
Ceiling
Side
Wall
Side
Wall
INSTALLATION
Continued
Corner
Wall
Wall
6 "
Minimum
6 "
Minimum
Back Wall
Side
Wall
Side
Wall
12 "
Minimum
12 "
Minimum
6 "
Minimum
Figure 4 - Minimum Clearance to Walls
and Ceiling
Front View
Top View
Front of
Stove
Unit
Side View
Top View
Front of
Stove
Unit
CONNECTING TO GAS SUPPLY
WARNING: A qualified ser-
vice person must connect heater
to gas supply. Follow all local
codes.
CAUTION: Never connect
propane/LP heater directly to the
propane/LP supply. This heater
requires an external regulator
(not supplied). Install the exter-
nal regulator between the heater
and propane/LP supply.
WARNING: Never connect
natural gas heater to private
(non-utility) gas wells. This
gas is commonly known as
wellhead gas.
Installation Items Needed
Before installing heater, make sure you have the
items listed below.
• external regulator - propane/LP only (supplied
by installer)
• piping (check local codes)
• sealant (resistant to propane/LP gas)
• equipment shutoff valve *
• test gauge connection *
• sediment trap
• tee joint
• pipe wrench
* A CSA design-certified equipment shutoff valve
with 1/8" NPT tap is an acceptable alternative to
test gauge connection. Purchase the optional CSA
design-certified equipment shutoff valve from your
dealer. See Accessories, page 30.

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For propane/LP units, the installer must supply
an external regulator. The external regulator will
reduce incoming gas pressure. You must reduce
incoming 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 protects
it from freezing rain or sleet.
CAUTION: Use only new,
black iron or steel pipe. Inter-
nally-tinned copper tubing may
be used in certain areas. Check
your local codes. Use pipe of
1/2" diameter or greater to allow
proper gas volume to heater. If
pipe is too small, undue loss of
volume will 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).
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.
Apply pipe joint sealant lightly to male NPT
threads. This will prevent excess sealant from
going into pipe. Excess sealant in pipe could result
in clogged heater valves.
INSTALLATION
Continued
Figure 6 - External Regulator With Vent
Pointing Down
Propane/LP
Supply Tank External
Regulator
Vent
Pointing
Down
Figure 5 - Gas Regulator Location and
Gas Line Access Into Stove Cabinet
6"
Minimum
48"
Minimum
Ceiling
Floor
Back Wall
Front of
Stove
Unit
Gas Regulator
Inlet Connection
Back View
Side View
WARNING: Use pipe joint
sealant that is resistant to liquid
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 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.
CAUTION: Avoid damage to
regulator. Hold gas regulator
with wrench when connecting it
to gas piping and/or fittings.
Tee Pipe Cap
Joint Nipple
3"
Min.
Sediment Trap
Gas
Regulator
of Heater
Natural Gas
From Gas Meter (5" W.C.**
to 10.5" W.C. Pressure)
Propane/LP
From External Regulator
(11" W.C.**
to 14" W.C.
Pressure)
CSA Design-
Certified
Equipment
Shutoff Valve
With 1/8"
NPT Tap*
Approved
Flexible
Gas Hose (if
allowed by
local codes)
Figure 7 - Gas Connection
* Purchase the optional CSA design-certified
equipment shutoff valve from your dealer. See
Accessories, page 30.
** Minimum inlet pressure for purpose of input
adjustment.

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111417-01B 11
CHECKING GAS CONNECTIONS
WARNING: Test all gas piping
and connections, internal and
external to unit, for leaks after
installing or servicing. Correct
all leaks at once.
WARNING: Never use an
open flame to check for a leak.
Apply a noncorrosive leak detec-
tion fluid to all joints. Bubbles
forming show a leak. Correct all
leaks at once.
CAUTION: Make sure exter-
nal regulator has been installed
between propane/LP supply and
heater. See guidelines under Con-
necting to Gas Supply, page 9.
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. Pressures in
excess of 1/2 psig will damage heater regulator.
2. Cap off open end of gas pipe where equipment
shutoff valve was connected.
3. Pressurize supply piping system by either
opening propane/LP supply tank valve for
propane/LP gas or opening main gas valve
located on or near gas meter for natural gas
or using compressed air.
4. Check all joints of gas supply piping system.
Apply a noncorrosive leak detection fluid to
all joints. Bubbles forming show a leak.
5. Correct all leaks at once.
6. Reconnect heater and equipment shutoff valve to
gas supply. Check reconnected fittings for leaks.
Test Pressures Equal To or Less Than
1/2 PSIG (3.5 kPa)
1. Close equipment shutoff valve (see Figure 8).
2. Pressurize supply piping system by either
opening propane/LP supply tank valve for
propane/LP gas or opening main gas valve
located 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 or 10). Apply a
noncorrosive leak detection fluid to all 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
supply tank valve.
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 or 10). Apply a
noncorrosive leak detection fluid to all joints.
Bubbles forming show a leak.
5. Correct all leaks at once.
6. Light heater (see Operating Heater, page 16).
Check all other internal joints for leaks.
7. Turn off heater (see To Turn Off Gas to Appli-
ance, page 17).
Open
Closed
Equipment
Shutoff
Valve
Figure 8- Equipment Shutoff Valve
Control Valve
Location
Propane/LP
Supply
Tank
Equipment Shutoff Valve
Gas Meter
Equipment
Shutoff Valve
Figure 9 - Checking Gas Joints for
Propane/LP Gas
Figure 10 - Checking Gas Joints for
Natural Gas
Control Valve Location
INSTALLATION
Continued

www.desatech.com 111417-01B
12
INSTALLING LOGS
WARNING: Failure to posi-
tion the parts in accordance
with these diagrams or failure
to use only parts specifically
approved with this heater may
result in property damage or
personal injury.
CAUTION: After installa-
tion and periodically thereafter,
check to ensure that no flame
comes in contact with any log.
With the heater set to HI, check
to see if flames contact any log. If
so, reposition logs according to
the log installation instructions
in this manual. Flames contact-
ing logs will create soot.
It is very important to install the logs exactly as
instructed. Do not modify logs. Only use logs
supplied 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).
IMPORTANT: Make sure log does not cover any
burner ports (see Figure 12).
INSTALLATION
Continued
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
Figure 12 - Installing One-Piece Log set
(Top View)
One Piece
Log Set
Burner Ports
INSTALLING OPTIONAL BLOWER
ACCESSORY GA3750
Tools required: Phillips screwdriver
NOTICE: Shut off gas heater
during the following blower
installation.
1. Remove 2 screws from rear tabs on top trim.
Pull trim forward to remove (see Figure 13).
2. Remove top panel of stove by removing three
screws from under top lip on each side of stove
(see Figure 13).
3. Facing front of stove, carefully slide top panel
forward until it is completely removed from
stove (see Figure 14).
Figure 13 - Removing Stove Top Panel
O
F
F
P
I
L
O
T
O
N
H
I
L
O
Top Trim
Top Panel
Screws
Figure 14 - Installing Bushing
Bushing

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111417-01B 13
INSTALLATION
Continued
9. Working from the rear of the stove, place entire
power cord, including speed control housing,
in lower control compartment.
10. Route ends of 3-wire power cord up from the
lower control compartment through the plastic
bushing, then up to the upper cavity of stove
(see Figure 17).
11. Attach the terminal ends of the white and
black power cord wires to the terminals on
the blower motor (see Figure 14, page 12).
Push firmly.
12. Attach the terminal end of the green power cord
wire to the front tab of the blower housing using
screw provided (see Figure 14, page 12).
13. Using the four screws previously removed,
mount blower assembly to stove by reattach-
ing blower brackets to rear panel (see Figure
16). Tighten screws securely.
14. Install plastic control knob onto output shaft of
speed control housing (see Figure 17). Place
speed control housing just inside control com-
partment door in front of stove (see Figure 18,
page 14).
4. Install one plastic bushing provided in blower
kit into the 1 1/2" hole in the left rear of firebox
floor. Access hole through the rectangular
opening in the rear panel (see Figure 15).
5. Disconnect power cord wires from blower
motor (if connected) (see Figure 15).
6. Disconnect green ground wire from blower
housing (if connected) by removing screw
holding wire terminal (see Figure 15).
7. Remove the two blower mounting brackets
from the rear panel by removing two screws
each (see Figure 16).
8. Attach the two mounting brackets to blower
housing using four screws provided in
blower kit (2 for each bracket) (see Figure
16). Tighten screws securely. Place blower
assembly temporarily on top of firebox.
Figure 16 - Removing Blower Brackets
from Stove and Attaching to Blower
Blower Blower
Bracket
Firebox
Top
Screws
Screws
Black
Powercord
Wire
Figure 15 - Removing Wires from Blower
Screw
Green Ground Wire
White
Powercord
Wire Power
Cord
Speed Control
Housing
Control
Knob
Figure 17 - Routing Power Cord
Wiring Diagram Decal
101584-05
120 Vac.
60 Hz. .
78 Amps
WARNING: Never attempt to service heater while it is plugged
in, operating or hot. Burns and electrical shock could result. Only a
qualified service person should service or repair heater.
If any of the original wire as supplied with the appliance must be replaced, it must
be replaced with 105°C wire or itʼs equivalent.
WARNING: Label all wires prior to disconnection when servicing
controls. Wiring errors can cause improper and dangerous operation.
Verify proper operation after servicing.
Variable
Fan Switch
White
White
Black
Green
On
110/115
V.A.C.
Blower
Motor
Black
Black
Black
Off
DESA Heating Products, Bowling Green, KY

www.desatech.com 111417-01B
14
INSTALLATION
Continued
15. Using two screws provided in blower kit,
mount blower speed control housing to mount-
ing tab in left side of lower control compart-
ment (see Figure 18).
16. Check to make sure that the power cord is
completely clear of blower wheel and there
are no foreign objects in blower wheel.
17. Carefully replace stove top panel. Align holes
and replace six screws removed in step 2, page
12. Slide top trim onto top panel. Attach with
2 screws removed in step 1, page 12.
18. Peel off the backing paper and stick the sup-
plied wiring diagram decal on the stove floor
as shown in Figure 17, page 13.
19. Plug power cord into a convenient 3-prong
grounded wall receptacle near the stove.
20. Using speed control knob, turn blower on and
check for operation.
21. All remaining parts from blower kit may be
discarded.
WARNING: ELECTRICAL
GROUNDING INSTRUCTIONS
This appliance is equipped with a
three-prong (grounding) plug for
your protection against shock
hazard and should be plugged
directly into a properly grounded
three-prong receptacle.
Figure 18 - Installing Blower Control
Housing
Blower Speed
Control Housing
INSTALLING OPTIONAL BLOWER
ACCESSORY GA3650TA
Tools required: Phillips screwdriver
NOTICE: Shut off gas heater
during the following blower
installation.
1. Remove 2 screws from rear tabs on top trim.
Pull trim forward to remove (see Figure 13,
page 12).
2. Remove three screws from under top lip on
each side of stove to remove top panel (see
Figure 13, page 12).
3. Facing front of stove, carefully slide top panel
forward until it is completely removed from
stove (see Figure 13, page 12).
6. Install one plastic bushing provided in blower
kit into the 1 1/2" hole in the left rear of firebox
floor. Access hole through the rectangular open-
ing in the rear panel (see Figure 14, page 12).
4. Disconnect power cord wires from blower mo-
tor (if connected) (see Figure 15, page 13).
5. Disconnect green ground wire from blower
housing (if connected) by removing screw hold-
ing wire terminal (see Figure 15, page 13).
7. Remove the two blower mounting brackets
from the rear panel by removing two screws
each (see Figure 16, page 13).
8. Attach the two mounting brackets to blower
housing using four screws provided in blower
kit (2 for each bracket) (see Figure 16, page
13). Tighten screws securely. Place blower
assembly temporarily on top of firebox.
9. If screen is installed, carefully lift slightly and
pull forward to remove.
10. If logs are installed, carefully remove and set
aside.
11. Remove three screws and cover plate from
center of firebox back panel. Keep screws but
discard cover plate (see Figure 19).
Figure 19 - Removing Cover Plate
Cover
Plate
Firebox Back Panel
Screws

www.desatech.com
111417-01B 15
INSTALLATION
Continued
12. Locate thermostatic switch/cover plate as-
sembly and wire harness supplied with blower.
Attach wire harness terminals to terminals on
thermostatic switch. Push firmly. Make sure
the bottom hole of cover is on the opposite
side from the wire harness (see Figure 20).
13. Feed terminal ends of wire harness into the
hole in firebox back panel from front of fire-
box. Pull the ends of the harness to the top of
firebox near blower (see Figure 21).
14. Align holes in the switch/cover assembly with
holes in firebox back panel. Using 3 screws
from step 11, attach assembly to firebox back
panel. Tighten screws firmly (see Figure 21).
15. Working from the rear of the stove, place
entire power cord, including speed control
housing, in lower control compartment (see
Figure 22).
16. Route ends of 3-wire power cord up from the
lower control compartment through the plastic
bushing, then up to the upper cavity of stove
(see Figure 22).
17. Connect white wire from speed control to
either terminal on blower motor (see Figure
22). Push firmly.
18. Connect the black wire from speed control
to blue wire on switch/cover assembly (see
Figure 22).
19. Connect red wire from switch/cover assembly
to remaining terminal on blower motor (see
Figure 22). Push firmly.
20. Attach green wire from speed control to front
tab of blower housing using screw provided
(see Figure 22). Tighten securely.
21. Using the four screws previously removed,
mount blower assembly to stove by reattach-
ing blower brackets to rear panel (see Figure
16, page 13). Tighten screws securely.
Figure 20 - Attaching Wire Harness to
Thermostatic Switch and Cover Assembly
Thermostatic
Switch Mounted
to Cover
Wire Harness
Bottom Hole
Figure 21 - Assembling Thermostatic
Switch and Cover to Firebox Back Panel
Thermostatic
Switch
Mounted to
Cover
Wire
Harness
Hole in
Firebox
Back
Panel
Screws
Wire Harness
Power
Cord
Speed Control
Housing
Control
Knob
Figure 22 - Connecting Switch, Blower
and Speed Control Wires
Wiring
Diagram
Decal
Blower
Red
Switch
Wire
Green
Ground Wire
Ground
Wire
Screw
White Speed
Control Wire
Black Speed Control Wire
Red
Variable
Fan Switch Fan Switch
(N.O.)
Green
White
On
110/115
V.A.C.
Blower
Motor
Black
Off 1
2
Black
Blue
120 Vac.
60 Hz.
90 Amps
WARNING: Never attempt to service heater while it is plugged
in, operating or hot. Burns and electrical shock could result. Only
a qualified service person should service or repair heater.
WARNING: Label all wires prior to disconnection when ser-
vicing controls. Wiring errors can cause improper and danger-
ous operation. Verify proper operation after servicing.
If any of the original wire as supplied with the appliance must be replaced,
it must be replaced with 105°C wire or itʼs equivalent.
Blue
Switch
Wire
DESA Heating Products,
Bowling Green, KY

www.desatech.com 111417-01B
16
INSTALLATION
Continued
22. Install plastic control knob onto output shaft
of speed control housing (see Figure 22, page
15). Place speed control housing just inside
control compartment door in front of stove
(see Figure 18, page 14).
23. Using two screws provided in blower kit,
mount blower speed control housing to mount-
ing tab in left side of lower control compart-
ment (see Figure 18, page 14 ).
24. Check to make sure that the power cord is
completely clear of blower wheel and there
are no foreign objects in blower wheel.
25. Carefully replace stove top panel. Align holes
and replace six screws removed in step 2, page
14. Slide top trim over tip panel. Attach with
2 screws removed in step 1, page 14.
26. Peel off the backing paper and stick the sup-
plied wiring diagram decal on the stove floor
as shown in Figure 22, page 15.
27. Plug power cord into a convenient 3-prong
grounded wall receptacle near the stove.
28. Using speed control knob, turn blower on and
check for operation.
29. Install logs (see Installing Logs, page 12).
30. Install screen assembly by aligning keyhole
slots in screen assembly and shoulder screws
on stove. Push back and down to secure.
31. All remaining parts from blower kit may be
discarded.
Note: If any of the original wire, as supplied with
the appliance, must be replaced, it must be replaced
with 105°C wire or itʼs equivalent.
WARNING: ELECTRICAL
GROUNDING INSTRUCTIONS
This appliance is equipped with a
three-prong (grounding) plug for
your protection against shock
hazard and should be plugged
directly into a properly grounded
three-prong receptacle.
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. BEFORE LIGHTING smell all around the
appliance area for gas. Be sure to smell next
to the floor because 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.
• Do not touch any electric switch; do not
use any phone in your building.
• Immediately call your gas supplier
from a neighborʼs phone. Follow the
gas supplierʼs instructions.
• If you cannot reach your gas supplier,
call the fire department.
C. Use only your hand to push in or turn the
gas control knob. Never use tools. If the
knob will not push in or turn by hand, donʼt
try to repair it, call a qualified service 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
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 under water.
LIGHTING
INSTRUCTIONS
NOTICE: During initial operation
of new heater, burning logs will
give off a paper-burning smell.
Orange flame will also be pres-
ent. Open a window to vent smell.
This will only last a few hours.
1. STOP! Read the safety information above.
2. Make sure equipment shutoff valve is fully open.
3. Turn control knob clockwise to the
OFF position.

www.desatech.com
111417-01B 17
Figure 23 - Control Knob and Ignitor
Button Location
Control Knob
Ignitor Button
OPERATING HEATER
Continued
Figure 24 - Pilot
Thermocouple
Pilot Burner
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
PILOT 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 output
and flame height from higher to lower settings
or pilot, in order to maintain the comfort level
you select. The ideal comfort setting will vary
by household depending upon 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. Follow steps 1 through 5 under Lighting
Instructions, starting on page 16.
2. Depress control knob and light pilot with
match.
3. Keep control knob pressed in for 30 seconds
after lighting pilot. After 30 seconds, release
control knob. Now follow step 8 under
Lighting Instructions, column 1.
4. Wait five (5) minutes to clear out any gas.
Then smell for gas, including near the floor.
If you smell gas, STOP! Follow “B” in the
safety information, column 2, page 16. If
you donʼt smell gas, go to the next step.
5. Turn control knob counterclockwise
to the PILOT position. Press in control
knob for five (5) seconds (see Figure 23).
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 for 30 seconds or more. This will
allow air to bleed from the gas system.
6. With control knob pressed in, press and
release 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.
7. Keep control knob pressed in for 30 seconds
after lighting pilot. After 30 seconds, release
control knob.
• If control knob does not pop out when
released, 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 interlock
system. Wait one (1) minute for system to
reset before lighting pilot again.
8. Turn control knob counterclockwise
to desired heating level. The burners 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.

www.desatech.com 111417-01B
18
OPERATING HEATER
Continued
OPERATING OPTIONAL
BLOWER ACCESSORY
Light your gas appliance with the blower off.
Turn the blower on to deliver heated air at the
top louvers. The blower features a variable
control which allows you to select the speed
you desire.
If Using the GA3650TA Blower Accessory:
In the ON position, the blower will start when the
thermostat senses a sufficient increase in firebox
temperature (approximately 10 to 20 minutes
depending on heat setting). Note: Your gas stove
and thermostat blower will not turn on and off
at the same time. The stove may run for several
minutes before the blower turns on. After the
heater modulates to the pilot position, the blower
will continue to run. The blower will shut off
after the firebox temperature decreases.
Note: It is safe to operate stove with blower
turned off. However, the blower helps distribute
heated air from the stove.
Note: Periodically check the louvers of the
firebox and remove any dust, dirt or other
obstructions.
INSPECTING BURNERS
Check pilot flame pattern and burner flame pat-
terns often.
PILOT FLAME PATTERN
Figure 25 shows a correct pilot flame pattern.
Figure 26 shows an incorrect pilot flame pattern.
The incorrect 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
Figure 26
• turn heater off (see To Turn Off Gas to Appli-
ance, page 17)
• see Troubleshooting, page 21
Note: The pilot flame on natural gas units will
have a slight curve, but flame should be blue and
have no yellow or orange color.
Figure 25 - Correct Pilot Flame Pattern
(Propane/LP Shown)
Figure 26 - Incorrect Pilot Flame Pattern
(Propane/LP Shown)
Thermocouple
Pilot Burner
Pilot Burner
Thermocouple
Figure 27 - Correct Flame Pattern with
Control Knob Set to High Flame.
Figure 28 - 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 27 shows a correct burner flame pattern.
Figure 27 shows an incorrect burner flame pattern.
If burner flame pattern is incorrect,
• turn heater off (see To Turn Off Gas to Appli-
ance, page 17)
• see Troubleshooting, page 21

www.desatech.com
111417-01B 19
CLEANING AND
MAINTENANCE
WARNING: Turn off heater
and let cool before cleaning.
CAUTION: You must keep
control areas, burner and circu-
lating air passageways of heater
clean. Inspect these areas of
heater before each use. Have
heater inspected yearly by a
qualified service person. Heater
may need more frequent clean-
ing due to excessive lint from
carpeting, bedding material, pet
hair, etc.
WARNING: Failure to keep
the primary air opening(s) of
the burner(s) clean may result in
sooting and property damage.
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 create soot. We recommend that you
clean the unit every three months during operation
and have heater inspected 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
compressed air no greater than 30 PSI. Your local
computer store, hardware store or home center
may carry compressed 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 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 29).
Figure 29 - Injector Holder On Outlet
Burner Tube
Burner
Tube
Injector
Holder
Primary Air
Inlet Holes
Figure 30 - Pilot Inlet Air Hole
Burner
Tube
Pilot Assembly
Pilot Air
Inlet Hole
Ports/
Slots
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
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 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 30). With the unit
off, lightly blow air through the air inlet hole. You
may blow through a drinking straw if compressed
air is not available.

www.desatech.com 111417-01B
20
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 Install-
ing Logs, page 12, to properly replace logs.
• Replace log(s) if broken or chipped (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
small blue 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.
SPECIFICATIONS
S39PT S39NT
Btu (Variable)
20,000/39,000 20,000/39,000
Type Gas Propane/LP Only Natural Only
Ignition Piezo Piezo
Manifold Pressure 8" W.C. 3.5" W.C.
Inlet Gas Pressure (in. of water) *
Maximum 14" 10.5"
Minimum 11" 5"
Dimensions, Inches (H x W x D)
Stove
31 x 32 x 19 1/4 31 x 32 x 19 1/4
Carton 24 x 31 1/2 x 35 1/4 24 x 31 1/2 x 35 1/4
Weight, pounds
Stove 78 lbs. 78 lbs.
Shipping 95 lbs. 95 lbs.
* For purposes of input adjustment
CLEANING AND
MAINTENANCE
Continued
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, con-
tact your local propane/LP or natural gas supplier.
TECHNICAL SERVICE
You may have further questions about installation,
operation or troubleshooting. If so, contact DESA
Heating Productsʼ Technical Service Department
at 1-866-672-6040. When calling please have your
model and serial numbers of your heater ready.
You can also visit DESA Heating Productsʼ techni-
cal services web site at www.desatech.com.
REPLACEMENT PARTS
Note: Use only original replacement parts. This
will protect your warranty coverage for parts
replaced under warranty.
PARTS UNDER WARRANTY
Contact authorized dealers of this product. If
they canʼt supply original replacement part(s),
call DESA Heating Productsʼ Technical Service
Department at 1-866-672-6040 for referral in-
formation.
When calling DESA Heating Products, 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, we will ask you to return the part to the
factory.
PARTS NOT UNDER WARRANTY
Contact authorized dealers of this product or Parts
Central (see page 24). If they canʼt supply original
replacement part(s), call DESA Heating Products
at 1-866-672-6040 for referral information.
When calling DESA Heating Products, have
ready
• model number of your heater
• the replacement part number