Desa WMP10, MN10T, WMN10, MP10T User Manual

VENT-FREE GAS HEATER
SAFETY INFORMATION AND INSTALLATION MANUAL
GWN6, GWP6, GWN10, GWP10, GWN10T, GWP10T, GWRN10,
GWRP10, MN10T, MP10T, VN1000BTA, VP1000BTA, VN10A,
VP10A, VN10TA, VP10TA, VN6D, VP5D, WMN10, WMP10
WARNING: If the information in this manual is not
followed 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
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 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
TABLE OF CONTENTS
Safety .................................................................. 2
Local Codes......................................................... 4
Unpacking............................................................ 4
Product Identication ........................................... 4
Product Features ................................................. 5
Air for Ventilation and Combustion ...................... 5
Installation ........................................................... 7
Operation ........................................................... 13
Inspecting Burner .............................................. 15
Cleaning ............................................................ 17

SAFETY

Technical Service............................................... 17
Service Hints ..................................................... 17
Service Publications .......................................... 17
Troubleshooting ................................................. 18
Replacement Parts ............................................ 21
Parts .................................................................. 22
Specications .................................................... 26
Accessory .......................................................... 27
Parts Centrals .................................................... 27
WARNING: Improper
installation, adjustment,
alteration, service or main-
tenance can cause injury or property damage. Refer
to this manual for correct
installation 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.
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This appliance may be in­stalled in an aftermarket,*
permanently located, 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 before 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 carbon 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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SAFETY
Continued
Natural and Propane/LP Gas: Natural and propane/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.
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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. Do not install 10,000 Btu/hr units in a bath­room (6,000 Btu/hr heaters are allowed in a 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. Always run heater with plaque control knob at the locked positions or ON position. Never set control knob between locked positions. Poor combustion and higher levels of carbon monoxide may result.
7. Keep all air openings in the front and bottom of heater clear and free of debris. This will insure enough air for proper combustion.
8. If heater shuts off, do not relight until you provide fresh, outside air. If heater keeps shutting off, have it serviced.
9. Do not run heater
• where ammable liquids or vapors are
used or stored
• under dusty conditions
10. Before using furniture polish, wax, carpet cleaner or similar products, turn heater off. If heated, the vapors from these prod­ucts may create a white powder residue within burner box or on adjacent walls or furniture.
SAFETY
Continued
11. 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.
12. Turn off heater and let cool before servic­ing. Only a qualied service person should service and repair heater.

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

UNPACkING

1. Remove heater from carton.
2. Remove all protective packaging applied to heater for shipment.
13. Operating heater above elevations of 4,500 feet could cause pilot outage.
14. To prevent performance problems, do not use propane/LP fuel tank of less than 100 lbs. capacity.
15. Provide adequate clearances around air openings.
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.
3. Check heater for any shipping damage. If heater is damaged call DESA Heating, LLC
at 1-866-672-6040 for replacement parts
before returning to dealer.
Ignitor Button
Glass Panel

PRODUCT IDENTIFICATION

Blue Flame Heater Infrared Heater
Control Knob
Grill
Guard
Front
Panel
Heater Cabinet
Figure 1 - Vent-Free Gas Heater
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Ignitor Button
Grill
Guard
Front
Panel
Heater Cabinet
Control Knob
Burners
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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 re-
quires no matches, batteries or other sources to light heater.
THERMOSTATIC HEAT CONTROL
(Thermostat Models Only)
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.

AIR FOR VENTILATION AND COMBUSTION

WARNING: This heater shall not
be installed in a room or space un­less the required volume of indoor combustion air is provided by the method described in the National
Fuel Gas Code, ANSI Z223.1/NFPA 54, the International Fuel Gas Code,
or applicable local codes. Read the following instructions to insure proper fresh air for this and other fuel­burning 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, 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.
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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
(6 x 10 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 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, 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/hr (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/hr (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.
kg per pa-sec-m2) or less with
AIR FOR COMBUSTION AND VENTILATION
Continued
DETERMINING FRESH-AIR FLOW FOR FIREPLACE 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 replace 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) = 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 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* + _________Btu/Hr Total = _________Btu/Hr * Do not include direct-vent gas appliances.
Direct-vent draws combustion air from the outdoors and vents to the outdoors.
Example: Gas water heater __________Btu/Hr Vent-free heater + _________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 can support) _______ Btu/Hr (actual amount
50,000 10,000 60,000
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 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 Ventilation Air From Inside
Building.
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 does not meet the required volume for indoor combustion air, combus­tion and ventilation air shall be provided by one of the methods described in the National Fuel
Gas Code, ANSI Z223.1/NFPA 54, the International Fuel Gas Code,
or applicable local codes.
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, page 7). You can also remove door into adjoining room (see option 3, Figure 2, page 7). Follow the National Fuel
Gas Code, ANSI Z223.1/NFPA 54, Air for Combustion and Ventilation for required size
of ventilation grills or ducts.
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123995-01C6
Or
Remove Door into Adjoining
Room,
Option 3
Ve ntilation Grills
Into Adjoining Room,
Option 2
12"
12"
Ve ntilation
Grills into Adjoining
Room,
Option 1
Outlet Air
V e ntilated Attic
Outlet Air
Inlet Air
Inlet Air
V e ntilated
Crawl Space
T o
Crawl
Space
T o Attic
AIR FOR COMBUSTION AND VENTILATION
Continued
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, 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.
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
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.
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.
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WARNING: This appliance is equipped for either natural gas or propane/LP gas but not both. Gas type is indicated on the rat­ing plate. Field conversion is not permitted.
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. Purchase the optional CSA design-certied equipment shutoff valve from your dealer.
LOCATING HEATER
36" (91.5 cm)
3" (7.7 cm)
FLOOR
CEILING
Minimum
8"
(20.3 cm)
Minimum From Sides Of Heater
Right Side
Left Side
36"
(91.5 cm)
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.
WARNING: Never install the
heater
• in a bathroom (10,000 Btu/hr only. 6,000 Btu/hr models are allowed in a bathroom. Check local codes.)
• 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
Figure 4 - Mounting Clearances As
Viewed From Front of Heater
Minimum To Top Surface Of Carpeting, Tile Or Other Combustible Material
INSTALLATION
Continued
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
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.
For conve nience and efficiency, install
heater
• where there is easy access for operation, inspection and service
• in coldest part of room
THERMOSTAT SENSING BULB
(Thermostat Models Only)
The thermostat sensing bulb is located below the heater. Do not move this bulb during instal­lation or operation of the heater.
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123995-01C8
INSTALLATION
Continued
INSTALLING HEATER TO WALL
Marking Screw Locations
1. Determine where you will locate heater.
WARNING: Maintain mini-
mum clearances shown in Figure
5. If you can, provide greater clearances from oor and join­ing wall.
2. Mark two mounting screw locations on wall (see Figure 5).
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 (see Figure 7).
IMPORTANT: Do not hammer key! For
thick walls (over 1/2" thick) or solid walls, do not pop open wings.
5. Tighten two screws until 1/16" space (thickness of penny) is between screw heads and wall (see Figure 8).
10 7/8"
Minimum
JOINING WALL
Figure 5 - Mounting Screw Locations
Installing Two Mounting Screws
Note: Wall anchors and mounting screws are in hardware package. The hardware package is provided with heater.
Attaching to Wall Stud Method
For attaching mounting screw to wall stud
1. Drill hole at marked location using 9/64" drill bit.
2. Insert mounting screw into wall stud.
3. Tighten screw until 1/16" space (thickness of penny) is between screw head and wall.
Attaching to Wall Anchor Method
Follow instructions below to attach mounting screws 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 1/4" deep.
2. Fold wall anchor (see Figure 6).
123995-01C 9
7 3/4"
Mounting
Screw
Locations
FLOOR
20 1/4"
Minimum To
Maintain 3"
Clearance
From Floor
1/16" Space
Placing Heater On Mounting Screws
1. Locate two keyhole slots on back panel
2. Place large openings of slots over screw
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Figure 6 - Folding Anchor
Figure 7 - Popping Open Anchor Wings
For Thin Walls
Thin or Thick Wall (thick wall shown)
Solid
Wall
Figure 8 - Tightening Anchors
of heater (see Figure 9).
heads. Slide heater down until screws are in small portion of slots.
Keyhole Slots
Figure 9 - Location Of Keyhole Slots On
Back Panel Of Heater
INSTALLATION
Continued
Removing Front Panel Of Heater
1. Remove two screws near bottom corners of front panel.
2. Lift straight up on grill guard until it stops. Grill guard will slide up about 1/4".
3. Pull bottom of front panel forward, then down.
Figure 10 - Removing Front Panel Of
Heater
Installing Bottom Mounting Screw
1. Locate bottom mounting hole. This hole is near bottom on back panel of heater (see Figure 11).
2. Mark screw location on wall.
3. Remove heater from wall.
4. If installing bottom mounting screw into hol­low or solid wall, install wall anchor. Follow steps 1 through 5 under Attaching To Wall Anchor Method, page 9. If installing bottom mounting screw into wall stud, drill hole at marked location using 9/64" drill bit.
5. Replace heater on wall.
6. Insert bottom anchor screw through back
panel into bottom anchor or drilled hole
(see Figure 11).
7. Tighten screw 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 10 through 13).
Figure 11 - Installing Bottom Mounting
Screw
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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 natural
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: 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 external regulator with the vent pointing down as shown in Figure 12, page 11. Pointing the vent down protects it from freezing rain or sleet.
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.
123995-01C10
INSTALLATION
Continued
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 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.
Check your building codes for any special requirements for locating equipment shutoff valve to heaters.
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.
WARNING: Use pipe joint sealant that is resistant to liquid petroleum (LP) gas.
Install sediment trap in supply line as shown in Figure 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.
IMPORTANT: Hold 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.
Propane/LP
Supply Tank
External
Regulator with Vent
Pointing
Down
3/8" NPT
Pipe Nipple
Ground
Joint Union
Equipment Shutoff Valve*
3"
Min
Natural Gas
From Gas Meter (4" W.C. to 10.5" W.C. Pressure [See Specications, page 26])
Propane/LP
From External Regulator (11" W.C. to 14" W.C. Pressure)
Figure 13 - 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.
Pressure Regulator
Tee Joint
Reducer
Bushing to
1/8" NPT 1/8" NPT
Plug Tap
Tee
Joint
Pipe
Nipple
Cap
Heater Cabinet
Test Gauge Connection*
Sediment Trap
Figure 12 - External Regulator With Vent
Pointing Down (propane/LP only)
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INSTALLATION
Continued
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 ame to check for a leak. Apply a noncorrosive leak detec­tion uid to all joints. Bubbles forming show a leak. Correct all leaks at once.
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 10.
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.
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Test Pressures Equal To or Less Than 1/2 PSIG (3.5 kPa)
1. Close equipment shutoff valve (see Fig­ure 14).
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 for natu­ral or propane/LP supply to equipment shutoff valve (see Figure 15 or 16). Apply a noncorrosive leak detection uid to all joints. Bubbles forming show a leak.
4. Correct all leaks at once.
Equipment Shutoff Valve
Figure 14 - Equipment Shutoff Valve
Gas Meter
Figure 15 - Checking Gas Joints for
Natural Gas
Control Valve Location
Propane/LP
Supply Tank
Equipment Shutoff Valve
Figure 16 - Checking Gas Joints for
Propane/LP Gas
Open
Closed
Control
Valve
Location
Equipment Shutoff Valve
123995-01C12
INSTALLATION
Continued
PRESSURE TESTING HEATER GAS CONNECTIONS
1. Open equipment shutoff valve (see Figure 14, page 12).
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 control valve (see Figures 15 or
16, page 12). Apply a noncorrosive leak detection uid to all joints. Bubbles form­ing show a leak.
5. Correct all leaks at once.
6. Light heater (see Operation). Check all other internal joints for leaks.
7. Turn off heater (see To Turn Off Gas to Appliance, page 14).
8. Replace front panel.

OPERATION

FOR YOUR SAFETY
READ BEFORE LIGHTING
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 the control system and any gas control which has been under water.
123995-01C 13
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1. STOP! Read the safety information start­ing in column 1.
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 (5) 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 starting in column 1. If you don’t smell gas, go to the next step.
6. Thermostat Models: Turn control knob counterclockwise to the PILOT position. Press in control knob for ve (5) seconds.
Manual Models: Press in and turn control
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, the control knob may need to be pressed in 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 18 or contact a qualied service person or gas supplier for repairs. Until repairs are made, light pilot with match. See Manual Lighting Procedure, page 14.
LIGHTING
INSTRUCTIONS
OPERATION
OFF
O
O
T
Continued
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. 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.
10. To leave pilot lit and shut off burners only, turn control knob clockwise to the PILOT position.
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.
Ignitor Button Control Knob
Figure 17 - Control Knob In The OFF
Position (Manual Control Models)
Ignitor Button Control Knob
Figure 18 - Control Knob In The OFF
Position (Thermostat Models)
Thermocouple
Figure 19 - Pilot (pilot may vary from
illustration)
Ignitor Electrode
Pilot Burner
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CAUTION: Do not try to ad-
just heating levels by using the equipment shutoff valve.
TO TURN OFF GAS
TO APPLIANCE
1. Turn control knob clockwise to the OFF position.
2. Turn off any electric power to the appli­ance if service is to be performed.
3. Close equipment shutoff valve (see Figure 14, page 12.
MANUAL LIGHTING
PROCEDURE
1. Remove front panel (see page 10).
2. Follow steps 1 through 7 under Lighting Instructions, page 13.
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, column 2.
5. Replace front panel.
THERMOSTAT
CONTROL OPERATION
Thermostat models only
The thermostatic control used on these models differs from standard thermostats. Standard thermostats simply turn on and off the burner. The thermostat used on this heater senses the room temperature. 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. This adjusts the amount of gas ow to the burner. This increases or decreases the burner ame height.
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.
123995-01C14
OPERATION
ON
OFF
PILOT
IGN
OFF
Continued
MANUAL CONTROL INFRARED
MODELS ONLY
TO SELECT
HEATING LEVEL
WARNING: When running heater, set control knob at LOW or HIGH locked positions for double burner heater or ON po­sition for single burner heater. Never set control knob between locked positions. Poor combus­tion and higher levels of carbon monoxide may result.
CAUTION: Do not try to ad-
just heating levels by using the equipment shutoff valve.

INSPECTING BURNER

Check pilot ame pattern and burner ame pattern often.
PILOT FLAME PATTERN
Figure 21 shows a correct pilot ame pattern. Figure 22 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 22
• turn heater off (see To Turn Off Gas to Ap- pliance, page 14)
• see Cleaning, page 17
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.
Slightly press in control knob and turn counter­clockwise to the LOW or HIGH positions for double burner heater or ON position for single burner heater.
IMPORTANT: Release downward pressure while turning control knob. Control knob will lock at the desired position.
Control Double Knobs Burners
Figure 20 - Burner Patterns
Thermocouple
Figure 21 - Correct Pilot Flame Pattern
Thermocouple
Figure 22 - Incorrect Pilot Flame Pattern
Control Single Knob Burner
Pilot Burner
Pilot Burner
123995-01C 15
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1/2 GLASS HEIGHT
1/2 GLASS HEIGHT
CORRECT FLAME PATTERN
AT HIGH POSITION
1/2 GLASS HEIGHT
INSPECTING BURNER
Continued
WARNING: If yellow tipping occurs, your heater could pro­duce increased levels of carbon monoxide. If burner ame pattern shows yellow tipping, proceed with the following instructions.
NOTICE: Do not mistake orange ames with yellow tipping. Dust or other ne particles enter the heater and burn causing brief patches of orange ame.
BURNER FLAME PATTERN BLUE FLAME MODELS
Figure 23 shows a correct burner ame pat­tern. Figure 24 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 24
• turn heater off (see To Turn Off Gas to Ap- pliance, page 14)
• see Cleaning, page 17
BURNER FLAME PATTERN INFRARED MODELS
Figure 25 shows a correct burner ame pat­tern. Figure 26 shows an incorrect burner ame pattern.
If burner ame pattern is incorrect, as shown in Figure 26
• turn heater off (see To Turn Off Gas to Ap- pliance, page 14)
• see Cleaning, page 17
Figure 25 - Correct Burner Flame Pattern
(Dual Burner Shown)
Figure 26 - Incorrect Burner Flame
Pattern (Dual Burner Shown)
(Models GWN6 and GWP6 will be lower due to
Figure 23 - Correct Burner Flame Pattern
Figure 24 - Incorrect Burner Flame
lower input rating)
Pattern
Yellow Tipping
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123995-01C16

CLEANING

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 ORIFICE
Use a vacuum cleaner, pressurized air or small, soft bristled brush to clean.
BURNER 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 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,
dirt, lint and pet hair. 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 hole about 2" from where the pilot ame comes out of the pilot assembly (see Figure 27). 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.
Pilot Assembly
Pilot Air Inlet
Figure 27 - 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.

TECHNICAL SERVICE

You may have further questions about installa­tion, operation, or troubleshooting. If so, con­tact DESA Heating, LLC at 1-866-672-6040. When calling please have your model and serial numbers of your heater ready.
You can also visit DESA Heating, LLC’s web site at www.desatech.com.

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
• for propane/LP unit, propane/LP gas supply
may be low
You may feel your gas pressure is too low. If so, contact your local gas supplier.

SERVICE PUBLICATIONS

A service manual is available at www.desat­ech.com. At any time while viewing heaters,
click on “tech tips”.
123995-01C 17
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TROUBLESHOOTING

WARNING: Turn off 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
Whe n ig nito r but ton 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 pinched or wet
5. Piezo ignitor nut is loose
6. Broken ignitor cable
7. Bad piezo ignitor
1. Gas supply turned off or equipment shutoff valve
closed
2. Control knob not in PILOT
position
3. Control knob not pressed in while in PILOT position
4. Air in gas lines when in-
stalled
5. Depleted gas supply (pro­pane/LP 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 metal or tubin g. Keep ignitor cable dry
5. Tighten nut holding piezo ignitor to heater cabinet. Nut is located inside heater
cabinet at top
6. Replace ignitor cable
7. Replace piezo ignitor
1. Turn on gas supply or open equipment shutoff valve
2. Turn control knob to PILOT
position
3. Press in control knob while in PILOT position
4. Continue hol ding down control knob. Repeat ignit­ing operation until air is removed
5. Contact local propane/LP
gas company
6. Clean ODS/pilot (see Clean­ing, page 17) or replace
ODS/pilot assembly
7. Replace gas regulator
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123995-01C18
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