Desa GWN20TA, GWN30TA, GWP20TA, GWP30TA User Manual

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Desa GWN20TA, GWN30TA, GWP20TA, GWP30TA User Manual

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 followed exactly, a fire or explosion may result causing property damage, personal injury or loss of life.

Do not store or use gasoline or other flammable vapors and liquids in the vicinity of this or any other appliance.

WHAT TO DO IF YOU SMELL GAS

Do not try to light any appliance.

Do not touch any electrical switch; do not use any phone in your building.

Immediatelycallyourgassupplierfromaneighbor’s phone. Follow the gas supplier’s instructions.

If you cannot reach your gas supplier, call the fire department.

Installationandservicemustbeperformedbyaqualified 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 Information................................................

2

Troubleshooting.................................................

 

19

Local Codes.........................................................

4

Specifications.....................................................

 

23

Product Identification............................................

4

Service Hints......................................................

 

23

Unpacking............................................................

4

Replacement Parts.............................................

 

23

Product Features..................................................

4

Technical Service...............................................

 

23

Air For Combustion And Ventilation.....................

5

Service Publications...........................................

 

23

Installation............................................................

7

Illustrated Parts Breakdown and Parts List........

24

Operating Heater................................................

15

Accessories........................................................

 

26

Inspecting Heater...............................................

17

Parts Centrals....................................................

 

27

Cleaning and Maintenance................................

18

Warranty Information............................

Back Cover

Safety Information

WARNING: Improper installation, adjustment, alteration, service or maintenance can cause injury or property damage. Refer to this manual for correct installation and operational procedures. For assistance or additional information consult a qualified installer,serviceagencyor the gas supplier.

WARNING: This is an unvented gas-fired heater. Itusesair(oxygen)fromthe roominwhichitisinstalled. Provisions for adequate combustion and ventilation air must be provided.

RefertoAirforCombustion 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 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:Thisproductcontainsand/orgenerateschemicals known to the State of California to cause cancer or birth defects or other reproductive harm.

IMPORTANT: Read this owner’s manualcarefullyandcompletely 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:Carbonmonoxide

poisoning may lead to death!

CarbonMonoxidePoisoning: Early signs of carbon monoxide poisoning resemble the flu, with headaches, dizziness or nausea. If you have these signs, the heater may not be working properly. Get fresh air at once! Have heater serviced. Some people are more affected by carbon monoxide than others. These include pregnant women, people with heart or lung disease or anemia, those under the influence of alcohol and those at high altitudes.

 

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119344-01B

Safety Information

Continued

Natural and Propane/LP Gas: Natural and propane/LPgases 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 insertorotheraccessorynotapproved for use with this heater.

Due to high temperatures, the applianceshouldbelocatedout oftrafficandawayfromfurniture and draperies.

Do not place clothing or other flammable 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 shutdown. Allow surface to cool before touching.

Carefully supervise young children 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 flammable 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 fire department

5.This heater needs fresh, outside air ventilationtorunproperly.ThisheaterhasanOxygenDepletionSensing(ODS)safetyshutoff 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 flammable liquids or vapors are used or stored

under dusty conditions

9.Before using furniture polish, wax, carpet cleanerorsimilarproducts,turnheateroff.If heated,thevaporsfromtheseproductsmay createawhitepowderresiduewithinburner box or on adjacent walls or furniture.

10.Do not use heater if any part has been under water. Immediately call a qualified service technician to inspect the room heater and to replace any part of the control system and any gas control which has been under water.

11.Turn off and let cool before servicing. Only a qualified service person should service and repair heater.

119344-01B

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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 fitter in the Commonwealth of Massachusetts.

Sellers of unvented propane or natural gas-fired supplemental room heaters shall provide to each purchaser a copy of 527 CMR 30 upon sale of the unit.

Vent-free gas products are prohibited for bedroom and bathroom installation in the

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

Control Knob

 

Cabinet Ignitor Button

 

Grill Guard

Glass Panel

Front Panel

Figure 1 - Vent-Free Gas Heater

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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119344-01B

Air For Combustion

And Ventilation

WARNING: This heater shall not be installed in a confined space or unusually tight constructionunlessprovisionsare providedforadequatecombustionandventilationair.Readthe followinginstructionstoinsure proper fresh air for this and other fuel-burning appliances in your home.

Today’s homes are built more energy efficient than ever. New materials, increased insulation and new construction methods help reduce heat loss in homes. Home owners weather strip and caulk around windows and doors to keep the cold air out and the warm air in. During heating months, home owners want their homes as airtight as possible.

While it is good to make your home energy efficient, your home needs to breathe. Fresh air must enter your home.All fuel-burning appliances need fresh air for proper combustion and ventilation.

Exhaust fans, fireplaces, clothes dryers and fuel burning appliances draw air from the house to operate. You must provide adequate fresh air for these appliances. This will insure proper venting of vented fuel-burning appliances.

PROVIDING ADEQUATE VENTILATION

The following are excerpts from National Fuel Gas Code, ANSI Z223.1/NFPA 54, Section 5.3, Air for Combustion and Ventilation.

All spaces in homes fall into one of the three following ventilation classifications:

1.Unusually Tight Construction

2.Unconfined Space

3.Confined Space

The information on pages 5 through 7 will help you classify your space and provide adequate ventilation.

Unusually Tight Construction

The air that leaks around doors and 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 defined as construction where:

a.walls and ceilings exposed to the outside atmosphere have a continuous water vapor retarder with a rating of one perm (6x10-11 kg per pa-sec-m2) or less with openings gasketed or sealed and

b.weather stripping has been added on openable windows and doors and

c.caulking or sealants are applied to areas such as joints around window and door frames, between sole plates and floors, between wall-ceiling joints, between wall panels, at penetrations for plumbing, electrical and gas lines and at other openings.

If your home meets all of the three criteria above, you must provide additional fresh air. See Ventilation Air From Outdoors, page 7.

Ifyourhomedoesnotmeetallofthethreecriteria above, proceed to Determining Fresh-Air Flow For Heater Location, page 6.

Confined and Unconfined Space

The National Fuel Gas Code, ANSI Z223.1/ NFPA 54 defines a confined space as a space whose volume is less than 50 cubic feet per 1,000 Btu per hour (4.8 m3 per kw) of the aggregate input rating of all appliances installed in that space and an unconfined space as a space whose volume is not less than 50 cubic feet per 1,000 Btu per hour (4.8 m3 per kw) of the aggregate input rating of all appliances installed in that space. Rooms communicating directly with the space in which the appliances are installed*, through openings not furnished with doors, are considered a part of the unconfined space.

* Adjoining rooms are communicating only if there are doorless passageways or ventilation grills between them.

119344-01B

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AIR FOR COMBUSTION

AND VENTILATION

Continued

DETERMINING FRESH-AIR FLOW FOR HEATER LOCATION

Determining if You Have a Confined or Unconfined Space

Use this work sheet to determine if you have a confined or unconfined space.

Space: Includes the room in which you will install heater plus any adjoining rooms with doorless 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 fireplace logs _____________ Btu/Hr

Other gas appliances*+____________ Btu/Hr Total =____________ Btu/Hr

* Do not include direct-vent gas appliances. Direct-vent draws combustion air from the outdoors and vents to the outdoors.

Example:

 

 

 

Gas water heater

_

40,000

Btu/Hr

Vent-free heater

+_

20,000

Btu/Hr

Total

=_

60,000

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 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 confined 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 unconfined space, remove door to adjoining room or add ventilation grills between rooms. See Ventilation Air From Inside Building, page 7.

B.Vent room directly to the outdoors. See

Ventilation Air From Outdoors, page 7.

C.Install a lower Btu/Hr heater, if lower Btu/Hr size makes room unconfined.

IftheactualBtu/Hrusedislessthanthemaximum Btu/Hr the space can support, the space is an unconfined space. You will need no additional fresh air ventilation.

WARNING: If the area in which the heater may be operatedissmallerthanthatdefined as an unconfined space or if the building is of unusually tight construction, provide adequate combustion and ventilation air byoneofthemethodsdescribed in the National Fuel Gas Code, ANSIZ223.1/NFPA54Section5.3 or applicable local codes.

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119344-01B

AIR FOR COMBUSTION

AND VENTILATION

Continued

VENTILATION AIR

Ventilation Air From Inside Building

This fresh air would come from an adjoining unconfined space. When ventilating to an adjoining unconfined space, you must provide two permanent openings: one within 12" of the ceiling and one within 12" of the floor on the wall connecting the two spaces (see options 1 and 2, Figure 2). You can also remove door into adjoining room (see option 3, Figure 2). Follow the National Fuel Gas Code, ANSI Z223.1/NFPA 54, Section 5.3, Air for Combustion and Ventilation for required size of ventilation grills or ducts.

 

12"

 

Ventilation Grills

Ventilation

Into Adjoining Room,

Option 2

Grills into

Or

Adjoining

Remove

Room,

Door into

Option 1

Adjoining

 

Room,

 

Option 3

 

12"

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 floor. Connect these items directly to the outdoors or spaces open to the outdoors. These spaces include attics and crawl spaces. Follow the National Fuel Gas Code, ANSI Z223.1/NFPA 54, Section 5.3, Air for Combustion and Ventilation for required size of ventilation grills or ducts.

IMPORTANT: Do not provide openings for inlet or outlet air into attic if attic has a thermo- stat-controlled power vent. Heated air entering the attic will activate the power vent.

 

Outlet

Ventilated

 

Attic

 

Air

 

 

Outlet

 

 

Air

 

To Attic

 

 

 

 

To

 

 

Crawl

Inlet

 

Space

 

 

Air

 

 

 

Inlet Air

Ventilated

 

Crawl Space

 

 

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 centralheatingsystem,youmay run system’s circulating blower whileusingheater.Thiswillhelp circulatetheheatthroughoutthe house. In the event of a power outage, you can use this heater as your primary heat source.

WARNING: A qualified 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.

This appliance is only for use withthetypeofgasindicatedon 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.

119344-01B

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INSTALLATION

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-certified equipment shutoff valve with 1/8" NPT tap is an acceptable alternative to test gauge connection. The optional CSAdesign-certified equipment shutoff valve can be purchased from your dealer. See Accessories, 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 floor, ceiling and joining wall.

You can locate heater on floor, away from a wall.An optional floor mounting stand is needed. Purchase the floor 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 flammable objects are less than 36" from the front, top or sides of the heater

as a fireplace insert

in high traffic areas

in windy or drafty areas

CAUTION: This heater creates warm air currents. These currents move heat to wall surfaces 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 fluids,oilorkerosenelamps,etc.)in the air exist, may discolor walls or cause odors.

IMPORTANT: Vent-free heaters add moisture to the air.Although this is beneficial, installing heater in rooms without enough ventilation air may cause mildew to form from too much moisture. See Air for Combustion and Ventilation, page 5. If high humidity is experienced, a dehumidifier 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 floor

locate heater where moving vehicle will not hit it

For convenience and efficiency, 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.

 

CEILING

6"

36"

Minimum

Minimum

From

 

Sides Of

 

Heater

 

Right

Side

Left

 

Side

 

 

Minimum To

 

Top Surface

2"

Of Carpeting,

Tile Or Other

FLOOR

Combustible

Material

Figure 4 - Mounting Clearances As

Viewed From Front of Heater

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119344-01B

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 showninFigure5.Mountingholeislocated 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

Screw

 

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.

WARNING: Maintain minimumclearancesshowninFigure

8, page 10. If you can, provide greater clearances from floor and joining wall.

119344-01B

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