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GWN20TA
User Manual
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Desa GWN20TA, GWN30TA, GWP20TA, GWP30TA User Manual

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Page 1
UNVENTED (VENT-FREE) BLUE FLAME GAS HEATER
SAFETY INFORMATION AND INSTALLATION MANUAL
MODELS
GWN20TA, GWP20TA, GWN30TA, GWP30TA, WMN20A, WMP20A
WARNING: If the information in this manual is not fol-
lowed exactly, a re or explosion may result causing property damage, personal injury or loss of life.
— Do not store or use gasoline or other ammable
— 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 re department.
— Installation and service must be performed by a quali-
ed installer, service agency or the gas supplier.
INSTALLER: Leave this manual with the appliance. CONSUMER: Retain this manual for future reference.
For more information, visit www.desatech.com
Page 2
Safety Information ............................................... 2
TABLE OF CONTENTS
Local Codes......................................................... 4
Product Identication ........................................... 4
Unpacking............................................................ 4
Product Features ................................................. 4
Air For Combustion And Ventilation ..................... 5
Installation ........................................................... 7
Operating Heater ............................................... 15
Inspecting Heater .............................................. 17
Cleaning and Maintenance ................................ 18
Troubleshooting ................................................. 19
Specications .................................................... 23
Service Hints ..................................................... 23
Replacement Parts ............................................ 23
Technical Service............................................... 23
Service Publications .......................................... 23
Illustrated Parts Breakdown and Parts List........ 24
Accessories ....................................................... 26
Parts Centrals .................................................... 27
Warranty Information ...........................Back Cover

SAFETY INFORMATION

WARNING: Improper in­stallation, adjustment, al-
teration, service or mainte-
nance can cause injury or property damage. Refer to
this manual for correct in-
stallation and operational procedures. For assis-
tance or additional infor-
mation consult a qualied installer, service agency or the gas supplier.
WARNING: This is an
unvented gas-red 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 is only for use with the type of gas indicated on the rating plate. This appliance is not convertible for use with other gases.
This appliance may be in-
stalled in an aftermarket,*
per man entl y lo cate d, manufactured (mobile) home, where not prohib­ited by local codes.
* Aftermarket: Completion of sale, not for purpose of resale, from the manufacturer
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 be fore trying to assemble, operate or service this heater. Improper use of this heater can cause serious injury or death from burns, fire, explosion, electrical shock and carbon monoxide poisoning.
DANGER: Carbon monoxide
poisoning may lead to death!
Carbon Monoxide Poisoning: Early signs of car-
bon monoxide poisoning resemble the u, with headaches, dizziness or nausea. If you have these signs, the heater may not be working properly. Get fresh air at once! Have heater serviced. Some people are more affected by carbon monoxide than others. These include pregnant women, people with heart or lung disease or anemia, those under the inuence of alcohol and those at high altitudes.
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119344-01B2
Page 3
SAFETY INFORMATION
Continued
Natural and Propane/LP Gas: Natural and pro-
pane/LP gases are fuel gases. Fuel gases are odorless. An odor-making agent is added to fuel gases. The odor helps you detect a fuel gas leak. However, the odor added to fuel gas can fade. Fuel gas may be present even though no odor exists.
Make certain you read and understand all warnings. Keep this manual for reference. It is your guide to safe and proper operation of this heater.
WARNING: Any change to
this heater or its controls can
be dangerous.
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 appliance should be located out of trafc and away from furniture and draperies.
Do not place clothing or other ammable material on or near the appliance. Never place any objects on the heater.
Surface of heater becomes very hot when running heater. Keep
children and adults away from
hot surface to avoid burns or clothing ignition. Heater will
remain hot for a time after shut-
down. Allow surface to cool before touching.
Carefully supervise young chil-
dren when they are in the same
room with heater.
Make sure grill guard is in place before running heater.
Keep the appliance area clear and free from combustible ma­terials, gasoline and other am­mable vapors and liquids.
1. This appliance is only for use with the type of gas indicated on the rating plate. This appliance is not convertible for use with other gases.
2. Do not place propane/LP supply tank(s) inside any structure. Locate propane/LP supply tank(s) outdoors.
3. This heater shall not be installed in a bedroom or bathroom.
4. 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 re department
5.
This heater needs fresh, outside 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.
6. Keep all air openings in front and bottom of heater clear and free of debris. This will insure enough air for proper combustion.
7. If heater shuts off, do not relight until you provide fresh, outside air. If heater keeps shutting off, have it serviced.
8. Do not run heater
• where ammable liquids or vapors are
used or stored
• under dusty conditions
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. Do not use heater if any part has been under water. Immediately call a qualied 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.
11. Turn off and let cool before servicing. Only a qualied service person should service and repair heater.
119344-01B 3
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Page 4
SAFETY INFORMATION
Continued
12. Operating heater above elevations of 4,500 feet could cause pilot outage.
13. To prevent performance problems, do not use propane/LP fuel tank of less than 100 lbs. capacity.
14. Provide adequate clearances around air openings.

LOCAL CODES

Install and use heater with care. Follow all lo­cal codes. In the absence of local codes, use
the latest edition of 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
State of Massachusetts: The installation must be made by a licensed plumber or gas tter in the Commonwealth of Mas­sachusetts.
Sellers of unvented propane or natural gas-red 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
Commonwealth of Massachusetts.

UNPACKING

1. Remove heater from carton.
2. Remove all protective packaging applied to heater for shipment.
3. Check heater for any shipping damage. If heater is damaged, promptly inform dealer where you bought heater.
PRODUCT
IDENTIFICATION
Heater Cabinet
Front Panel
Ignitor Button
Glass Panel
Figure 1 - Vent-Free Gas Heater
Control Knob
Grill Guard

PRODUCT FEATURES

SAFETY DEVICE
This heater has a pilot with an Oxygen Deple­tion Sensing (ODS) safety shutoff system. The ODS/pilot is a required feature for vent-free room heaters. The ODS/pilot shuts off the heater if there is not enough fresh air.
PIEZO IGNITION SYSTEM
This heater has a piezo ignitor. This system re­quires no matches, batteries or other sources to light heater.
THERMOSTATIC HEAT CONTROL
Thermostat models have a thermostat sens­ing bulb and a control valve. This results in the greatest heater comfort. This can also result in lower gas bills.
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119344-01B4
Page 5
AIR FOR COMBUSTION
AND VENTILATION
WARNING: This heater shall
not be installed in a conned space or unusually tight con­struction unless provisions are provided for adequate combus­tion and ventilation air. Read the following instructions to insure proper fresh air for this and other fuel-burning appliances in your home.
Today’s homes are built more energy efcient 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 ef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, replaces, 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
following ventilation classications:
1. Unusually Tight Construction
2. Unconned Space
3. Conned 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.
Unusually tight construction is dened as construction where:
a. walls and ceilings exposed to the outside
atmosphere have a continuous water vapor retarder with a rating of one perm
-11
(6x10
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 oors, between wall-ceiling joints, between wall panels, at penetrations for plumbing,
electrical and gas lines and at other open-
ings.
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, page 6.
Conned and Unconned Space
The National Fuel Gas Code, ANSI Z223.1/ NFPA 54 denes a conned 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 unconned 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 communicating directly with the space in which the appliances are installed*, through openings not furnished with doors, are considered a part of the un­conned space.
* Adjoining rooms are communicating only if there are doorless passageways or ventilation grills between them.
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Page 6
AIR FOR COMBUSTION
AND VENTILATION
Continued
DETERMINING FRESH-AIR FLOW FOR HEATER LOCATION
Determining if You Have a Conned or Unconned Space
Use this work sheet to determine if you have a conned or unconned space.
Space: Includes the room in which you will install heater plus any adjoining rooms with doorless passageways or ventilation grills between the rooms.
1. Determine the volume of the space (length x width x height).
Length x Width x Height =__________cu. ft.
(volume of space)
Example: Space size 20 ft. (length) x 16 ft.
(width) x 8 ft. (ceiling height) = 2560 cu. ft. (volume of space)
If additional ventilation to adjoining room
is supplied with grills or openings, add the volume of these rooms to the total volume of the space.
2. Multiply the space volume by 20 to determine the maximum Btu/Hr the space can support.
______ (volume of space) x 20 = (Maximum
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 heater ____________ Btu/Hr Gas water heater* ____________ Btu/Hr Gas furnace ____________ Btu/Hr Vented gas heater ____________ Btu/Hr Gas replace logs ____________ Btu/Hr
Other gas appliances*
Total = ___________ Btu/Hr * Do not include direct-vent gas appliances.
Direct-vent draws combustion air from the outdoors and vents to the outdoors.
Example:
Gas water heater ____________ Btu/Hr Vent-free heater + ___________ Btu/Hr Total = ___________ Btu/Hr
+ ___________ Btu/Hr
40,000 20,000 60,000
4. Compare the maximum Btu/Hr the space can support with the actual amount of Btu/Hr used.
_______ Btu/Hr (maximum can support) _______ Btu/Hr (actual amount used) Example:
51,200 Btu/Hr (maximum the space can
support)
60,000 Btu/Hr (actual amount of Btu/Hr
used)
The space in the above example is a conned space because the actual Btu/Hr used is more than the maximum Btu/Hr the space can sup­port. You must provide additional fresh air. Your options are as follows:
A. Rework worksheet, adding the space of an
adjoining room. If the extra space provides an unconned space, remove door to adjoin­ing room or add ventilation grills between rooms. See Ventilati on Air From Inside Building, page 7.
B. Vent room directly to the outdoors. See
Ventilation Air From Outdoors, page 7.
C. Install a lower Btu/Hr heater, if lower Btu/Hr
size makes room unconned.
If the actual Btu/Hr used is less than the maximum Btu/Hr the space can support, the space is an unconned space. You will need no additional fresh air ventilation.
WARNING: If the area in
which the heater may be oper­ated is smaller than that dened as an unconned 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.
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119344-01B6
Page 7
Or
Remove Door into Adjoining
Room,
Option 3
Ventilation Grills
Into Adjoining Room,
Option 2
12"
12"
Ventilation
Grills into Adjoining
Room,
Option 1
Outlet Air
Ventilated Attic
Outlet A
ir
Inlet Air
Inlet Air
Ventilated
Crawl Space
To
Crawl
Space
To Attic
AIR FOR COMBUSTION
AND VENTILATION
Continued
VENTILATION AIR
Ventilation Air From Inside Building
This fresh air would come from an adjoining unconned space. When ventilating to an adjoining unconned space, you must provide two permanent openings: one within 12" of the ceiling and one within 12" of the oor 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 3 - Ventilation Air from Outdoors

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 pri­mary 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 qualied ser­vice person must install heater. Follow all local codes.
Figure 2 - Ventilation Air from Inside
Building
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 oor. 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.
119344-01B 7
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CHECK GAS TYPE
Use only the correct type of gas (natural or propane/LP). If your gas supply is not the correct gas type, do not install heater. Call dealer where you bought heater for proper type heater.
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.
WARNING: This appliance is equipped for natural or pro­pane/LP gas. Field conversion is not permitted.
Page 8
INSTALLATION
Minimum From Sides Of Heater
36"
2"
FLOOR
CEILING
Minimum
Minimum To Top Surface Of Carpeting, Tile Or Other Combustible Material
Left Side
Right Side
6"
Continued
INSTALLATION ITEMS
Before installing heater, make sure you have the items listed below.
• for propane/LP gas, external regulator (supplied by installer)
• piping (check local codes)
• sealant (resistant to propane/LP gas)
• equipment shutoff valve *
• ground joint union
• sediment trap
• tee joint
• pipe wrench
• for natural gas, test gauge connection*
* A CSA design-certied equipment shutoff valve with 1/8" NPT tap is an acceptable alter­native to test gauge connection. The optional CSA design-certied equipment shutoff valve can be purchased from your dealer. See Ac- cessories, page 26.
LOCATING HEATER
This heater is designed to be mounted on a wall.
WARNING: Maintain the
minimum clearances shown
in Figure 4. If you can, provide greater clearances from oor, ceiling and joining wall.
You can locate heater on oor, away from a wall. An optional oor mounting stand is need­ed. Purchase the oor mounting stand from your dealer. See Accessories, page 26.
WARNING: Never install the
heater
• in a bedroom or bathroom
• in a recreational vehicle
• where curtains, furniture,
clothing or other ammable objects are less than 36" from the front, top or sides of the
heater
• as a replace insert
• in high trafc 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 u­ids, 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 benecial, installing heater in rooms without enough ventilation air may cause mildew to form from too much moisture. See Air for Combustion and Ventila- tion, page 5. If high humidity is experienced, a dehumidier may be used to help lower the water vapor content in the air.
CAUTION: If you install the
heater in a home garage
• heater pilot and burner must be at least 18" above oor
• locate heater where moving
vehicle will not hit it
For convenience and efciency, install heater
• where there is easy access for operation, inspection and service
• in coldest part of room
An optional fan kit is available from your dealer. See Accessories, page 26. If planning to use fan, locate heater near an electrical outlet.
Figure 4 - Mounting Clearances As
Viewed From Front of Heater
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119344-01B8
Page 9
INSTALLATION
Continued
THERMOSTAT SENSING BULB
(Thermostat Models Only)
The thermostat sensing bulb has been placed below the heater.
1. Place clamp on thermostat sensing bulb as shown in Figure 5. Clamp is provided in hardware package.
2. Snap clamp into upper mounting hole as shown in Figure 5. Mounting hole is located on lower left edge on back of heater. Make sure the thermostat sensing bulb is point­ing up.
Clamp
Thermostat Sensing Bulb
Figure 5 - Attaching Thermostat Sensing
Bulb
INSTALLING HEATER TO WALL
Mounting Bracket
Locate mounting bracket in heater carton. Re­move mounting bracket from heater carton.
Figure 6 - Mounting Bracket
Removing Front Panel Of Heater
1. Remove the four painted screws, two on each side of front panel.
2. Pull bottom of front panel forward, then out.
3. Remove any remaining packaging ma­terials.
Front Panel
Figure 7 - Removing Front Panel Of
Heater
Methods For Attaching Mounting Bracket
To Wall
Only use last hole on each end of mounting bracket to attach bracket to wall. These two holes are 14" apart from their centers. Attach mounting bracket to wall in one of two ways:
1. Attaching to wall stud
2. Attaching to wall anchor
Attaching to Wall Stud: This method provides
the strongest hold. Insert mounting screws through mounting bracket and into wall studs.
Attaching to Wall Anchor: This method allows
you to attach mounting bracket to hollow walls (wall areas between studs) or to solid walls (concrete or masonry).
Decide which method better suits your needs. Either method will provide a secure hold for the mounting bracket.
Marking Screw Locations
1. Tape mounting bracket to wall where heater will be located. Make sure mount­ing bracket is level.
Screw
WARNING: Maintain mini-
mum clearances shown in Figure 8, page 10. If you can, provide greater clearances from oor and joining wall.
119344-01B 9
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Page 10
INSTALLATION
8"
(20.3
cm)
Min.
Ad j o ini n g Wa ll
Ad j o ini n g Wa ll
Only Insert Mounting Screws Through Last
Hole On Each End
Only Insert Mounting Screws Through Last
Hole On Each End
Floor
Floor
14" (35.6 cm)
14" (35.6 cm)
18 3/4"
(47.6 cm)
Min.
18 3/4"
(47.6 cm)
Min.
12"
(30.4
cm)
Min.
8"
(20.3
cm)
Min.
Ad j o i ning Wal l
Only Insert Mounting
Screws Through Last
Hole On Each End
Floor
14" (35.6 cm)
18 3/4"
(47.6 cm)
Min.
Continued
2.
Mark screw locations on wall (see Figure 8).
Note: Only mark last hole on each end of
mounting bracket. Insert mounting screws through these holes only.
3. Remove tape and mounting bracket from wall.
30,000 Btu/Hr Models
Attaching To Wall Anchor Method
For attaching mounting bracket to hollow walls (wall areas between studs) or solid walls (concrete or masonry)
1. Drill holes at marked locations using 5/16" drill bit. For solid walls (concrete or masonry), drill at least 1" deep.
2. Fold wall anchor as shown in Figure 9.
3. Insert wall anchor (wings rst) into hole. Tap anchor ush to wall.
4. For thin walls (1/2" or less), insert red key into wall anchor. Push red key to “pop” open anchor wings. IMPORTANT: Do not ham- mer key! For thick walls (over 1/2" thick) or solid walls, do not pop open wings.
5. Place mounting bracket onto wall. Line up last hole on each end of bracket with wall anchors.
6. Insert mounting screws through bracket and into wall anchors.
7. Tighten screws until mounting bracket is rmly fastened to wall.
20,000 Btu/Hr Models
Figure 8 - Mounting Bracket Clearances
Attaching Mounting Bracket To Wall
Note: Wall anchors, mounting screws and spacers are in hardware package. The hard­ware package is provided with heater.
Attaching To Wall Stud Method
For attaching mounting bracket to wall studs
1. Drill holes at marked locations using 9/64" drill bit.
2. Place mounting bracket onto wall. Line up last hole on each end of bracket with holes drilled in wall.
3. Insert mounting screws through bracket and into wall studs.
4. Tighten screws until mounting bracket is rmly fastened to wall studs.
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Figure 9 - Folding
Anchor
Figure 10 - Popping
Open Anchor Wings
For Thin Walls
Placing Heater On Mounting Bracket
1. Locate two horizontal slots on back panel of heater.
2. Place heater onto mounting bracket. Slide horizontal slots onto stand-out tabs on mounting bracket.
Horizontal Slots
Stand­Out Tab
Mounting Bracket (attached to wall)
Figure 11 - Mounting Heater Onto
Mounting Bracket
119344-01B10
Page 11
Side View
Front View
INSTALLATION
Continued
Installing Bottom Mounting Screws
1. Locate two bottom mounting holes. These holes are near bottom on back panel of heater (see Figure 12).
2. Mark screw locations on wall.
3. Remove heater from mounting bracket.
4. If installing bottom mounting screws into hollow or solid wall, install wall anchors. Follow steps 1 through 4 under Attaching To Wall Anchor Method, page 10.
If installing bottom mounting screw into
wall stud, drill holes at marked locations using 9/64" drill bit.
5. Replace heater onto mounting bracket.
6. Place spacers between bottom mounting holes and wall anchor or drilled hole.
7. Hold spacer in place with one hand. With other hand, insert mounting screw through bottom mounting hole and spacer. Place tip of screw in opening of wall anchor or drilled hole.
8. Tighten both screws until heater is rmly secured to wall. Do not over tighten.
Note: Do not replace front panel at this
time. Replace front panel after making gas connections and checking for leaks (see pages 12 through 14).
Heater
Wall
Spacer
MOUNTING HEATER TO FLOOR
WITH OPTIONAL FLOOR KIT
Mounting Base Feet to Heater
1. Lay heater cabinet on its back on a table with the heater bottom overhanging the table edge.
2. Align holes in base foot with mounting holes on bottom of cabinet (see Figure 13).
3. Secure base foot to heater using sheet metal screws.
4. Repeat for other side.
Wood
Screw
Base Foot
Sheet Metal Screw
Figure 13 - Installing Base Feet
Mounting Base Feet to Floor
1. Remove front panel (see Removing Front Panel of Heater, page 9).
2. Position heater with base feet in desired location. Mark holes for drilling. Remove heater with base.
3. For carpeted oors, make a small cut with a sharp knife at marked locations prior to drilling. If mounting base to a wood oor, drill 1/8" diameter hole, 3/4" deep. (Do not use anchors in wood oors).
If mounting base to a concrete oor, drill
with 1/4" diameter concrete drill bit, 13/8" into oor. Insert anchors completely into holes.
4. Reposition heater with base feet over holes. Secure base to oor with wood screws. See Figure 13.
Figure 12 - Installing Bottom Mounting
119344-01B 11
Screws
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Page 12
INSTALLATION
Continued
CONNECTING TO GAS SUPPLY
WARNING: This appliance requires a 3/8" NPT (National Pipe Thread) inlet connection to the pressure regulator.
WARNING: A qualied ser­vice person must connect heater to gas supply. Follow all local codes.
WARNING: For n a t u r a l
gas, never connect heater to private (non-utility) gas wells. This gas is commonly known as wellhead gas.
IMPORTANT: For natural gas, check gas line pressure before connecting heater to gas line. Gas line pressure must be no greater than
10.5" of water. If gas line pressure is higher, heater regulator damage could occur.
CAUTION: Use only new,
black iron or steel pipe. Inter­nally-tinned copper tubing may be used in certain areas. Check your local codes. Use pipe of large enough diameter to allow proper gas volume to heater. If pipe is too small, undue loss of volume will occur.
Typical Inlet Pipe Diameters
20,000 Btu/Hr Models - 3/8" or greater 30,000 Btu/Hr Models - 1/2" or greater
Installation must include 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 15, page 13).
IMPORTANT: Install an 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.
CAUTION: For propane/LP gas, never connect heater directly to the propane/LP supply. This heater requires an external regu­lator (not supplied). Install the external regulator between the heater and propane/LP supply.
For propane/LP gas, 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" of water. If you do not reduce incom­ing gas pressure, heater regulator damage could occur. Install the external regulator with the vent pointing down as shown in Figure
14. Pointing the vent down protects it from freezing rain or sleet.
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WARNING: Use pipe joint sealant that is resistant to liquid petroleum (LP) gas.
Install sediment trap in supply line as shown in Figure 15, page 13. Locate sediment trap where it is within reach for cleaning. 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.
Propane/LP
Supply Tank
External
Regulator
Vent
Pointing
Down
Figure 14 - External Regulator With Vent
Pointing Down
119344-01B12
Page 13
INSTALLATION
Continued
IMPORTANT: Hold the pressure regulator with wrench when connecting it to gas pip­ing and/or ttings. Do not over tighten pipe connection to regulator. The regulator body could be damaged.
Pressure Regulator
3/8" NPT
Pipe Nipple
Tee Joint
Reducer Bushing to 1/8" NPT
1/8" NPT Plug Tap
Test Gauge Connection*
Tee Joint
Pipe Nipple
Cap
Sediment Trap
Figure 15 - Gas Connection
* A CSA design-certied equipment shutoff valve with 1/8" NPT tap is an acceptable al­ternative to test gauge connection. Purchase the optional CSA design-certied equipment shutoff valve from your dealer. See Acces- sories, page 26.
10.5" W.C. Pressure)
From External Regulator
(11" W.C. to 14" W.C.
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.
Heater Cabinet
Ground Joint
Union
Equipment Shutoff Valve*
Natural Gas
3"
From Gas
Min.
(4" W.C. to
Propane/LP
Pressure)
Meter
CAUTION: For propane/LP gas, make sure external regula­tor has been installed between propane/LP supply and heater. See guidelines under Connect- ing to Gas Supply, page 12.
PRESSURE TESTING GAS SUPPLY PIPING SYSTEM
Test Pressures In Excess Of 1/2 PSIG (3.5 kPa)
1. Disconnect appliance 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 uid 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 ttings for leaks.
Test Pressures Equal To or Less Than 1/2 PSIG (3.5 kPa)
1. Close equipment shutoff valve (see Fig­ure 16).
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.
Equipment Shutoff Valve
Open
WARNING: Never use an
open ame to check for a leak. Apply a noncorrosive leak detec-
Figure 16 - Equipment Shutoff Valve
Closed
tion uid to all joints. Bubbles forming show a leak. Correct all leaks at once.
119344-01B 13
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Page 14
INSTALLATION
Continued
3. Check all joints from gas meter for natural gas (see Figure 17) or propane/LP supply tank for propane/LP gas, to equipment shutoff valve (see Figure 18). Apply a noncorrosive leak detection uid 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 16, page 13).
2. For natural gas open main gas valve located on or near gas meter. For pro­pane/LP gas 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 thermostat gas valve (see Figure 17 or 18). Apply a noncorrosive leak de­tection uid to all joints. Bubbles forming show a leak.
5. Correct all leaks at once.
6. Light heater (see Operating Heater, start- ing on page 15). Check all other internal joints for leaks.
7. Turn off heater (see To Turn Off Gas to Appliance, page 16).
8. Replace front panel.
Thermostat Gas Valve
Gas Meter
Equipment Shutoff Valve
Figure 17 - Checking Gas Joints for
Natural Gas
Thermostat Gas Valve
Propane/LP
Supply Tank
Equipment Shutoff Valve
Figure 18 - Checking Gas Joints for
Propane/LP Gas
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119344-01B14
Page 15

OPERATING HEATER

O
F
F
P
I
L
O
T
FOR YOUR SAFETY READ
BEFORE LIGHTING
6. Therm ostat Model s: Turn control knob counterclockwise to the PILOT position. Press in control knob for ve (5) seconds.
Manual Models: Press in and turn control
WARNING: If you do not fol-
low these instructions exactly,
a re or explosion may result causing property damage, per­sonal 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 oor because some gas is heavier than air and will settle on the oor.
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 neighbor’s phone. Follow the gas supplier’s instructions.
• If you cannot reach your gas supplier, call the re 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, don’t try to repair it, call a qualied service technician. Force or attempted repair may result in a re or explosion.
D. Do not use this appliance if any part
has been under water. Immediately call a qualied service technician to inspect the appliance and to replace any part of
knob counterclockwise to the PI­LOT position. Keep control knob pressed in for ve (5) seconds.
7. With control knob pressed in, push down and release ignitor button. This will light pilot. The pilot is attached to the front of burner. Note: You may be running this heater for the rst time after hooking up to gas supply. If so, you may need to press in control knob for 30 seconds or more. This will allow air to bleed from the gas system. If needed, keep pressing ignitor button until pilot lights. If ignitor does not light pilot, re­fer to Troubleshooting, page 19 or contact a qualied 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 16.
8. Keep control knob pressed in for 30 sec­onds after lighting pilot. After 30 seconds, release control knob.
• If control knob does not pop up when
released, contact a qualified service person or gas supplier for repairs.
Note: If pilot goes out, repeat steps 4 thru
7. Thermostat models have a safety inter­lock system. Wait one (1) minute before lighting pilot again.
9. Turn control knob counterclockwise to desired heating level. The main burner should light. Manual control heaters should be used in locked positions.
Ignitor Button
Control Knob
the control system and any gas control which has been under water.
LIGHTING
INSTRUCTIONS
1.
STOP! Read the safety information above.
2. Make sure equipment shutoff valve is fully open.
3. Turn off any electric power to the appli­ance if service is to be performed.
4. Turn control knob clockwise to the OFF position.
5. Wait ve minutes to clear out any gas. Then smell for gas, including near the oor. If you smell gas, STOP! Follow “B” in the safety information above. If you don’t smell gas, go to the next step.
119344-01B 15
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Figure 19 - Control Knob In The OFF
Position Manual Control Models
Ignitor Button Control Knob
Figure 20 - Control Knob In The OFF
Position Thermostat Models
Page 16
OPERATING HEATER
Continued
WARNING: Always operate
manual control heaters at the
locked positions. Operation between these positions may create a possible health hazard if used in a poorly ventilated room. Read owner’s manual for complete instructions.
CAUTION: Do not try to ad-
just heating levels by using the equipment shutoff valve.
Thermocouple
Ignitor Electrode
Pilot Burner
Figure 21 - Pilot (actual pilot may vary)
TO TURN OFF GAS
TO APPLIANCE
Shutting Off Heater
1. Turn control knob clockwise to the OFF position.
2. Turn off all electric power to the appliance if service is to be performed.
Shutting Off Burner Only (pilot stays lit)
Turn control knob clockwise to the PILOT position.
THERMOSTAT CONTROL
OPERATION
The thermostatic control used on thes e models differs from standard thermostats. Standard thermostats simply turn on and off the burner. The thermostat used on this heater senses the room temperature. The thermostat adjusts the amount of gas ow to the burner. This increases or decreases the burner ame height. At times the room may exceed the set temperature. If so, the burner will shut off. The burner will cycle back on when room temperature drops below the set temperature. The control knob can be set to any heat level between 1 and 5. Selecting the 5 setting will cause the burner to remain fully on without modulating down in most cases.
Note: The thermostat sensing bulb mea­sures the temperature of air near the heater cabinet. This may not always agree with room temperature (depending on housing construction, installation location, room size, open air temperatures, etc.). Frequent use of your heater will let you determine your own comfort levels.
MANUAL LIGHTING
PROCEDURE
1.
Remove front panel (see Figure 7, page 9).
2. Follow steps 1 through 7 under Lighting Instructions, page 15.
3. With control knob pressed in, strike match. Hold match to pilot until pilot lights.
4. Keep control knob pressed in for 30 sec­onds after lighting pilot. After 30 seconds, release control knob. Now follow step 9, under Lighting Instructions, page 15.
5. Replace front panel.
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119344-01B16
Page 17

INSPECTING HEATER

Check pilot ame pattern and burner ame pattern often.
PILOT FLAME PATTERN
Figure 22 shows a correct pilot ame pattern. Figure 23 shows an incorrect pilot ame pat­tern. The incorrect pilot ame is not touching the thermocouple. This will cause the thermo­couple to cool. When the thermocouple cools, the heater will shut down.
If pilot ame pattern is incorrect, as shown in Figure 23
• turn heater off (see To Turn Off Gas to Ap- pliance, page 16)
• see Troubleshooting, page 19
Note: The pilot ame on natural gas units will
have a slight curve, but ame should be blue and have no yellow or orange color.
Thermocouple
Blue Flame
Pilot Burner
Figure 22 - Correct Pilot Flame Pattern
Thermocouple
Yellow Flame
Pilot
Burner
BURNER FLAME PATTERN
WARNING: If yellow tipping occurs, your heater could pro­duce increased levels of carbon monoxide.
NOTICE: Do not mistake orange ames with yellow tipping. Dirt or other ne particles enter the heater and burn causing brief patches of orange ame.
Figure 24 shows a correct burner ame pat­tern. Figure 25 shows an incorrect burner ame pattern. The incorrect burner ame pattern shows yellow tipping of the ame. It also shows the ame higher than 1/2 the glass panel height.
If burner ame pattern is incorrect, as shown in Figure 25
• turn heater off (see To Turn Off Gas To Appliance, page 16)
• see Troubleshooting, page 19
Blue Flame
1
/2 Glass
Height
Figure 24 - Correct Burner Flame Pattern
Yellow Tipping
1
/2 Glass
Height
Figure 25 - Incorrect Burner Flame
Pattern
Figure 23 - Incorrect Pilot Flame Pattern
119344-01B 17
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Page 18
CLEANING AND
MAINTENANCE
WARNING: Turn off heater
and let cool before cleaning.
CAUTION: You must keep control areas, burner and circu­lating air passageways of heater clean. Inspect these areas of heater before each use. Have heater inspected yearly by a qualied service person. Heater may need more frequent clean­ing 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.
ODS/PILOT AND BURNER
Use a vacuum cleaner, pressurized air or small, soft bristled brush to clean.
BURNER PILOT AIR INLET
The primary air inlet holes allow the proper amount of air to mix with the gas. This pro­vides a clean burning ame. Keep these holes clear of dust, dirt and lint. 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 qualied 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. If using compressed 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 for dust and dirt.
3. Blow air through the ports/slots and holes in the burner.
4. Never insert objects into the pilot tube.
Clean the pilot assembly also. A yellow tip on the pilot ame indicates dust and dirt in the pilot assembly. There is a small pilot air inlet about two inches from where the pilot ame comes out of the pilot assembly (see Figure
26). With the unit off, lightly blow air through
the air inlet. You may blow through a drinking straw if compressed air is not available.
Pilot Assembly
Pilot Air Inlet
Figure 26 - Pilot Inlet Air
(Propane/LP Pilot Shown)
CABINET
Air Passageways
Use pressurized air to clean.
Exterior
Use a soft cloth dampened with a mild soap and water mixture. Wipe the cabinet to re­move dust.
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119344-01B18
Page 19

TROUBLESHOOTING

WARNING: Turn off and unplug heater and let cool before servicing.
Only a qualied 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.
Note: All troubleshooting items are listed in order of operation.
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
POSSIBLE CAUSE
1. Ignitor electrode positioned wrong
2. Ignitor electrode broken
3. Ignitor electrode not con-
nected to ignitor cable
4. Ignitor cable pinche d or wet
5. Broken ignitor cable
6. Bad piezo ignitor
1. Gas supply turned off or equip ment 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 in-
stalled
5. Depleted gas supply (pro­pane/LP gas only)
6. ODS/pilot is clogged
7. Gas regulator setting is not
correct
REMEDY
1. Replace pilot assembly
2. Replace pilot assembly
3. Reconnect ignitor cable
4. Free ignitor cable if pinched by any met al or tubing. Keep ignitor cable dry
5. Replace ignitor cable
6. Replace piezo ignitor
1. Turn on gas supply or open equipment shutoff valve
2. Turn control knob to PILOT
position
3. Press in control knob while in PILOT position
4. Co ntin ue hol din g down control knob. Repeat ignit­ing operation until air is removed
5. Contact local propane/LP
gas company
6. Clean ODS/pilot (see Clean­ing and Maintenance, page
18) or replace ODS/pilot
assembly
7. Replace gas regulator
119344-01B 19
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Page 20
OBSERVED PROBLEM
ODS/pilot lights but flame goes out when control knob
is released
TROUBLESHOOTING
Continued
POSSIBLE CAUSE
1. Control kn o b n o t fully
pressed in
2. Control knob not pressed in long enough
3. Safety interlock system has
been triggered
4. Equipment shutoff valve not fully open
5. Thermocouple connection loose at control valve
6. Pilot flame not touching thermocouple, which al­lows thermocouple to cool, causing pilot ame to go out. This problem could be caused by one or both of the following:
A) Low gas pressure B) Dirty or partially clogged
ODS/pilot
7. Thermocouple damaged
8. Control valve damaged
REMEDY
1. Press in control knob fully
2. After ODS/pilot lights, keep control knob pressed in 30
seconds
3. Wait one minute for safety interlock system to reset.
Repeat ignition operation
4. Fully open equipment shut­off valve
5. Hand tighten until snug, then tighten 1/4 turn more
6. A) Contact local natural or
propane/LP gas company
B) Clean ODS/pilot (see
Cleaning and Maintenance, page 18) or replace ODS/
pilot assembly
7. Replace pilot assembly
8. Replace control valve
Burner does not light after ODS/pilot is lit
Delayed ignition of burner
Burner backring during com­bustion
1. Burner orice is clogged
2. Inlet gas pressure is too low
1. Manifold pressure is too low
2. Burner orice is clogged
1. Burner orice is clogged or
damaged
2. Burner damaged
3. Gas regulator defective
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1. Clean burner (see Cleaning and Maintenance, page 18)
or replace burner orice
2. Contact local natu ral or
propane/LP gas company
1. Contact local natu ral or
propane/LP gas company
2. Clean burner (see Cleaning and Maintenance, page 18)
or replace burner orice
1. Clean burner (see Cleaning and Maintenance, page 18) or replace burner orice
2. Replace burner
3. Replace gas regulator
119344-01B20
Page 21
OBSERVED PROBLEM
Yellow ame during burner combustion
TROUBLESHOOTING
Continued
POSSIBLE CAUSE
1. Not enough air
2. Gas regulator defective
3. Clogged or dirty burner
REMEDY
1. Check burner for dirt and de b r i s. If fo u n d, cl e an burner (see Cleaning and Maintenance, page 18)
2. Replace gas regulator
3. Clean burner (see Cleaning and Maintenance, page 18)
Slight smoke or odor during
initial operation
Heater produces a whistling noise when burner is lit
White powder residue forming within burner box or on adja­cent walls or furniture
Heater produces a clicking/ ticking noise just after burner is lit or shut off
1. Residues from manufactur-
ing processes
1. Turning control knob to 5 position when burner is
cold
2. Air in gas line
3. Air passageways on heater blocked
4. Dirty or partially clogged burner orice
1. When heated, vapors from furniture polish, wax, carpet cleaners, etc. may turn into white powder residue
1. Metal expanding while heat­ing or contr acting while
cooling
1. Problem will stop after a few hours of operation
1. Turn control knob to 1 posi­tion and let warm up for a minute
2. Operate burner until air is removed from line. Have gas line checked by local natural or propane/LP gas
company
3. Observe minimum installa­tion clearances (see Figure 4, page 8)
4. Clean burner (see Cleaning and Maintenance, page 18) or replace burner orice
1. Turn heater off when us­ing furniture polish, wax,
carpet cleaners or similar
products
1. This is normal with most heaters. If noise is exces­sive, contact qualied ser­vice person
119344-01B 21
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Page 22
TROUBLESHOOTING
Continued
WARNING: If you smell gas
• Shut off gas supply.
• Do not try to light any appliance.
• Do not touch any electrical switch; do not use any phone in your building.
• 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 re department.
IMPORTANT: Operating heater where impurities in air exist may create odors. Cleaning sup­plies, paint, paint remover, cigarette smoke, cements and glues, new carpet or textiles, etc., create fumes. These fumes may mix with combustion air and create odors.
OBSERVED PROBLEM
Heater produces unwanted
odors
Heater shuts off in use (ODS operates)
Gas odor even when control knob is in OFF position
Gas odor during combustion
Moisture/condensation no­ticed on windows
POSSIBLE CAUSE
1. Heater burning vapors from paint, hair spray, glues, etc. (see IMPORTANT state- ment above)
2. Low fuel supply (propane/ LP gas only)
3. Gas leak. See Warning
statement above
1. Not enough fresh air is available
2. Low line pressure
3. OD S / pil o t i s p a rt ial l y
clogged
1. Gas leak. See Warning statement above
2. Control valve defective
1. Foreign matter between control valve and burner
2. Gas leak. See Warning
statement above
1. Not enough combustion/ ventilation air
REMEDY
1. Ventilate room. Stop us­ing odor causing products while heater is running
2. Rell supply tank
3. Locate and correct all leaks (see Checking Gas Con- nections, page 13)
1. Open window and/or door for ventilation
2. Contact local natu ral or
propane/LP gas company
3.
Clean ODS/pilot (see Cleaning and Maintenance, page 18)
1. Locate and correct all leaks (see Checking Gas Con- nections, page 13)
2. Replace control valve
1. Take apart gas tubing and remove foreign matter
2. Locate and correct all leaks (see Checking Gas Con- nections, page 13)
1. Refer to Air for Combustion and Ventila tion req uire­ments (page 5)
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119344-01B22
Page 23

SPECIFICATIONS

WMN20A, GWN20TA
• Btu (Variable): 10,000/20,000 Btu/Hr
• Type Gas: Natural Only
• Ignition: Piezo
• Pressure Regulator Setting: 3" W.C.
• Inlet Gas Pressure (in. of water): Maximum - 10.5", Minimum - 4"
GWN30TA
• Btu (Variable): 15,000/30,000 Btu/Hr
• Type Gas: Natural Only
• Ignition: Piezo
• Pressure Regulator Setting: 3" W.C.
• Inlet Gas Pressure (in. of water): Maximum - 10.5", Minimum - 4"
WMP20A, GWP20TA
• Btu (Variable): 10,000/20,000 Btu/Hr
• Type Gas: Propane/LP Only
• Ignition: Piezo
• Pressure Regulator Setting: 8" W.C.
• Inlet Gas Pressure (in. of water): Maximum - 14", Minimum - 11"
GWP30TA
• Btu (Variable): 15,000/30,000 Btu/Hr
• Type Gas: Propane/LP Only
• Ignition: Piezo
• Pressure Regulator Setting: 8" W.C.
• Inlet Gas Pressure (in. of water): Maximum - 14", Minimum - 11"

SERVICE HINTS

When Gas Pressure Is Too Low
• pilot will not stay lit
• burner will have delayed ignition
• heater will not produce specied heat
• propane/LP gas supply may be low You may feel your gas pressure is too low. If
so, contact your local natural or propane/LP gas supplier.

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 can’t supply original replacement part(s), call DESA Heating Products’ Technical Ser­vice Department at 1-866-672-6040.
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. If they can’t supply original replacement part(s), either contact your nearest Parts Central (see page 27) or call DESA Heating Products at 1­866-672-6040 for referral information.
When calling DESA Heating Products, have
ready
• model number of your heater
• the replacement part number

TECHNICAL SERVICE

You may have further questions about instal­lation, operation or troubleshooting. If so, contact DESA Heating Products’ Technical Servi ce 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 Products’ tech­nical service web site at www.desatech.com.

SERVICE PUBLICATIONS

You can purchase a service manual from the address listed on the back page of this manual. Send a check for $5.00 payable to DESA Heat­ing Products.
119344-01B 23
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Page 24
4*
20
4**
17
18**
19**
2
3
5
6
8
16
9
10
11
12
13
14
18*
*Manual Control Models Only **Thermostat Models Only
19*
7
1
21*
22*
15
9
ILLUSTRATED PARTS BREAKDOWN
MODELS
WMN20A, WMP20A, GWN20TA, GWP20TA, GWN30TA AND GWP30TA
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119344-01B24
Page 25
PARTS LIST
This list contains replaceable parts used in your heater. When ordering parts, follow the instructions listed under Replacement Parts on page 23 of this manual.
KEY NO. PART NO. DESCRIPTION QTY.
1 097159-04 Piezo Ignitor • • • • • • 1 2 107673-01 Front Panel • • • • 1
107676-01 Front Panel • • 1
3 103476-01 Grill Guard • • • • 1
103476-02 Grill Guard • • 1
4 100047-07 Gas Control Valve NG • 1
100047-08 Gas Control Valve LP • 1 098522-11 Thermostat Gas Valve LP • 1 098522-12 Thermostat Gas Valve NG • 1 098522-13 Thermostat Gas Valve LP • 1 098522-28 Thermostat Gas Valve NG • 1
5 104189-01 Bottom Glass Retainer • • • • 1
104189-02 Bottom Glass Retainer • • 1
6 098260-09 Glass • • • • 1
098260-10 Glass • • 1
7 ** Cabinet • • • • • • 1 8 107894-14 Deector Assembly • • • • 1
107894-15 Deector Assembly • • 1 9 098271-09 Ignitor Cable • • • • • • 1 10 098249-01 Nut • • • • • • 2 11 110803-01 ODS/Pilot Assembly • • • 1
110803-02 ODS/Pilot Assembly • • • 1 12 103446-02 Burner • • • • 1
103447-06 Burner • • 1 13 099387-03 Pilot Tubing • • • • 1
099387-05 Pilot Tubing • • 1 14 103845-05 Injector • • 1
103845-06 Injector • • 1
103845-07 Injector • 1
103845-08 Injector • 1 15 099066-02 Mounting Bracket • • • • • • 1 16 099415-17 Gas Regulator • • • 1
099415-18 Gas Regulator • • • 1 17 NJF 8C Hex Nut • • • • • • 1 18 103570-04 Outlet Tubing • • 1
103255-02 Outlet Tubing • • • • 1 19 103572-03 Inlet Tubing • • 1
103256-02 Inlet Tubing • • • • 1 20 118721-04 Bafe • • 1
118721-03 Bafe • • • • 1 21 098354-02 Control Knob • • 1 22 098508-01 Valve Retainer Nut • • 1
PARTS AVAILABLE — NOT SHOWN
110186-01 Thermocouple Kit • • • • • • 1
100642-03 Hardware Assembly • • • • • • 1
107888-01 Control Position Label • • • • • • 1
117103-03 Lighting Instruction Booklet • • • • • • 1
** Not a eld replaceable part.
WMN20A
WMP20A
GWN20TA
GWP20TA
GWN30TA
GWP30TA
119344-01B 25
www.desatech.com
Page 26

ACCESSORIES

Purchase these heater accessories from your local dealer. If they can not supply these acces­sories, either contact your nearest Parts Central (see page 27) or call DESA Heating Products at 1-866-672-6040 for referral information. You can also write to the address listed on the back page of this manual.
EQUIPMENT SHUTOFF VALVE
GA5010
For all models. Equipment shutoff valve with
1/8" NPT tap.
FAN KITS - PP100
For all models. Provides better heat distri-
bution. Makes heater more efcient. Com­plete installation and operating instructions included.
Thermostatically-controlled, blower turns itself on and off as required.
BASE KIT - GA4550
Accessory for “G” models, standard for
“W” models. For locating heater on the oor, away from a wall. Complete installation and operating instructions included.
ELECTRONIC IGNITOR KIT - GA435 Not Shown
For all piezo ignitor models. Provides easier lighting of the pilot.
www.desatech.com
119344-01B26
Page 27

PARTS CENTRALS

These Parts Centrals are privately owned businesses. They have agreed to support our customer’s needs by providing original replacement parts and accessories.
Tool & Equipment Co.
5 Manila Ave Hamden, CT 06514-0322
1-800-397-7553 203-248-7553
Portable Heater Parts
342 N. County Rd. 400 East Valparaiso, IN 46383-9704
219-462-7441 1-888-619-7060
www.portableheaterparts.com sales@portableheaterparts.com techservice@portableheaterparts.com
FBD
1349 Adams Street Bowling Green, KY 42103-3414
270-846-1199 1-800-654-8534
Fax: 1-800-846-0090 franktalk@aol.com
Master Parts Dist.
1251 Mound Ave. NW Grand Rapids, MI 49504-2672
616-791-0505 1-800-446-1446
www.nbmc.com
Washer Equipment Co.
1715 Main Street Kansas City, MO 64108-2195 KS, MO, AR
816-842-3911
www.washerparts.com
East Coast Energy
707 Broadway W. Long Branch, NJ 07764-1501
732-870-8809 1-800-755-8809
www.njplaza.com/ecep
21st Century
2950 Fretz Valley Perkasie, PA 18944-4034
215-795-0400 800-325-4828
Laporte’s Parts & Service
2444 N. 5th Street Hartsville, SC 29550-7704
843-332-0191
Parts Department
Cans Unlimited
P.O. Box 645 Taylor, SC 29687-0013
803-879-3009 1-800-845-5301
cuisales@aol.com
119344-01B 27
www.desatech.com
Page 28

WARRANTY INFORMATION

119344 01
KEEP THIS WARRANTY
Model
Serial No.
Date of Purchase
Always specify model and serial numbers when communicating with the factory. We reserve the right to amend these specications at any time without notice. The only warranty applicable
is our standard written warranty. We make no other warranty, expressed or implied.
LIMITED WARRANTIES FOR NEW AND FACTORY
RECONDITIONED PRODUCTS
New Products: DESA Heating Products warrants this heater and any parts thereof, to be free of defects
in materials and workmanship for two (2) years from the date of rst purchase, when operated and maintained in accordance with the manufacturer's instructions. These warranties are extended only to the original retail purchaser, when proof of purchase is provided.
Factory Reconditioned Heaters: DESA Heating Products warrants this factory reconditioned heater and
any parts thereof, to be free of defects in materials and workmanship for thirty (30) days from the date of rst purchase, when operated and maintained in accordance with the manufacturer's instructions. These warranties are extended only to the original retail purchaser, when proof of purchase is provided.
This warranty is extended only to the original retail purchaser. This warranty covers the cost of part(s) required to restore this heater to proper operating condition and an allowance for labor when provided by a DESA Heating Products Authorized Service Center. Warranty part(s) MUST be obtained through authorized dealers of this product and/or DESA Heating Products who will provide original factory replacement parts. Failure to use original factory replacement parts voids this warranty. The heater MUST be installed by a qualied installer in accordance with all local codes and instructions furnished with the unit.
This warranty does not apply to parts that are not in original condition because of normal wear and tear or parts that fail or become damaged as a result of misuse, accidents, lack of proper maintenance or defects caused by improper installation. Travel, diagnostic cost, labor, transportation and any and all such other costs related to repairing a defective heater will be the responsibility of the owner.
TO THE FULL EXTENT ALLOWED BY THE LAW OF THE JURISDICTION THAT GOVERNS THE SALE OF THE PRODUCT; THIS EXPRESS WARRANTY EXCLUDES ANY AND ALL OTHER EXPRESSED WARRANTIES AND LIMITS THE DURATION OF ANY AND ALL IMPLIED WARRANTIES, INCLUDING WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE TO TWO (2) YEARS ON ALL COMPONENTS FROM THE DATE OF FIRST PURCHASE; AND DESA HEATING PRODUCTS’ LIABILITY IS HEREBY LIMITED TO THE PURCHASE PRICE OF THE PRODUCT AND DESA HEATING PRODUCTS SHALL NOT BE LIABLE FOR ANY OTHER DAMAGES WHATSOEVER INCLUDING INDIRECT, INCIDENTAL OR CONSEQUENTIAL DAMAGES.
Some states do not allow a limitation on how long an implied warranty lasts or an exclusion or limitation of incidental or consequential damages, so the above limitation on implied warranties or exclusion or limitation on damages may not apply to you.
This warranty gives you specic legal rights and you may also have other rights that vary from state to state. For information about this warranty write:
2701 Industrial Drive P.O. Box 90004 Bowling Green, KY 42102-9004 www.desatech.com
119344-01
Rev. B
05/06
NOT A UPC
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