Desa Tech Gas Heater CGN20TA User Manual

OWNER’S MANUAL

BLUE FLAME VENT-FREE NATURAL GAS HEATER

OWNER’S OPERATION AND INSTALLATION MANUAL

CGN20TA

Heater Size: 20,000 Btu/Hr Thermostat

WARNING: This is an

unvented gas-fired heater. It

uses air (oxygen) from the

room in which it is installed.

Provisions for adequate

combustion must be pro-

vided. Refer to page 4 of this

manual

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.

—

Donotstoreorusegasolineorotherflammable

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.

• Ifyoucannotreachyourgassupplier,callthe

fire department.

—

Installation and service must be performed by

a qualified installer, service agency, or the gas

supplier.

This appliance may be installed in an aftermarket* manufactured (mobile) home, where not prohibited by

state or local codes.

* Aftermarket: Completion of sale, not for purpose of resale, from the manufacturer.

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.

Save this manual for future reference.

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OWNER’S MANUAL

PRODUCT

IDENTIFICATION

Ignitor Button

Control Knob

Grill Guard

Glass Panel

Heater Cabinet

Front

Panel

Figure 1 - Vent-Free Natural Gas Heater

LOCAL CODES

PRODUCT

UNPACKING

1. Remove heater from carton.

FEATURES

Install and use heater with care. Follow all

local codes. In the absence of local codes,

use the latest edition of the National Fuel

Gas Code ANSI Z223, also known as NFPA

54*.

2. Remove all protective packaging ap-

plied to heater for shipment.

Safety Device

3. Check heater for any shipping damage.

If heater is damaged, promptly inform

dealer where you bought heater.

This heater has a pilot with an Oxygen

Depletion Sensor Shutoff System (ODS).

TheODS/pilotisarequiredfeatureforvent-

free room heaters. The ODS/pilot shuts off

the heater if there is not enough fresh air.

*Available from:

American National Standards Institute, Inc.

1430 Broadway

New York, NY 10018

Piezo Ignition System

National Fire Protection Association, Inc.

Batterymarch Park

This heater has a piezo ignitor. This system

requires no matches, batteries, or other

sources to light heater.

Quincy, MA 02269

Thermostatic Heat Control

Thermostat models have a thermostat sens-

ing bulb and a control valve. This results in

the greatest heater comfort. This can also

result in lower gas bills.

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CGN20TA

Blue Flame Vent-Free Natural Gas Heater

Confined and Unconfined Space

PROVIDING ADEQUATE

VENTILATION

FRESH AIR FOR

COMBUSTION AND

VENTILATION

TheNationalFuelGasCode(ANSIZ2123.1,

1992 Section 5.3) 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 m³per kw) of the aggregate

inputratingofallappliancesinstalledinthat

space. Rooms communicating directly with

the space in which the appliances are in-

stalled*, through openings not furnished

with doors, are considered a part of the

unconfined space.

ThefollowingisexerptsfromNationalFuel

Gas Code. NFPA 54/ANSI Z223.1, Section

5.3, Air for Combustion and Ventilation.

WARNING: This heater shall

not be installed in a confined

space unless provisions are pro-

vided for adequate combustion

and ventilation air. Read the fol-

lowing instructions to insure

proper fresh air for this and other

fuel-burning appliances in your

home.

All spaces in homes fall into one of the three

following ventilation classifications:

1. Unusually Tight Contruction

2. Unconfined Space

3. Confined Space.

The information on pages 4 through 6 will

help you classify your space and provide

adequate ventilation.

Unusually Tight Construction

Today’s homes are built more energy effi-

cient than ever. New materials, increased

insulation, and new construction methods

help reduce heat loss in homes. Home own-

ers 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 pos-

sible.

* Adjoining rooms are communicating only

iftherearedoorlesspassagewaysorventila-

tion grills between them.

The air that leaks around doors and win-

dows may provide enough fresh air for

combustion and ventilation. However, in

buildings of unusually tight construction,

you must provide additional fresh air.

** Cubic feet equals length x width x height

of room.

Unusually tight construction is de-

fined as construction where:

a. walls and ceilings exposed to the

outside atmosphere have a con-

tinuous water vapor retarder with

a rating of one perm (6x10^-11kg

per pa-sec-m²) or less with open-

ings gasketed or sealed and

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 com-

bustion and ventilation.

Exhaustfans, fireplaces, clothesdryers, and

fuel burning appliances draw air from the

house to operate. You must provide ad-

equate fresh air for these appliances. This

will insure proper venting of vented fuel-

burning appliances.

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, be-

tween sole plates and floors, be-

tween wall-ceiling joints, be-

tween wall panels, at penetra-

tions for plumbing, electrical, and

gas lines, and at other openings.

If your home meets all of the three

criteria above, you must provide ad-

ditional fresh air. See Ventilation Air

From Outdoors, page 6.

If your home does not meet all of the

threecriteriaabove,proceedtopage5.

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OWNER’S MANUAL

2. Divide the space volume by 50 cubic 4. Compare the maximum Btu/Hr the

FRESH AIR FOR

feet to determine the maximum Btu/Hr

space can support with the actual

COMBUSTION AND

the space can support.

amount of Btu/Hr used.

_______________ (volume of space)

÷ 50 cu. ft. = (Maximum Btu/Hr the

space can support)

__________ Btu/Hr (maximum the

space can support)

VENTILATION

Continued

__________ Btu/Hr (actual amount of

Btu/Hr used)

Example: 2560 cu. ft. (volume of

space) ÷ 50 cu. ft. = 51.2 or 51,200

(maximum Btu/Hr the space can sup-

port)

DETERMINING FRESH-AIR

FLOW FOR HEATER

LOCATION

Example: 51,200 Btu/Hr (maximum

the space can support)60,000 Btu/Hr

(actual amount of Btu/Hr used)

3. Add the Btu/Hr of all fuel burning ap-

pliances in the space.

Determining if You Have a

Confined or Unconfined Space

The space in the above example is a con-

fined 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:

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

Use this worksheet 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.

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 ventila-

tion grills between rooms. See Ventila-

tion Air From Inside Building, page 6.

1. Determine the volume of the space

(length x width x height).

Total

= ___ Btu/Hr

Example:

Length x Width x Height =

B. Vent room directly to the outdoors. See

Gas water heater

Vent-free heater

Total

40,000 Btu/Hr

+ 20,000 Btu/Hr

= 60,000 Btu/Hr

Ventilation Air From Outdoors, page 6.

__________ cu. ft. (volume of space)

C. Install a lower Btu/Hr heater, if lower

Btu/Hr size makes room unconfined.

Example: Space size 20 ft. (length) x

16 ft. (width) x 8 ft. (ceiling height) =

2560 cu. ft. (volume of space)

* Do not include direct-vent gas appli-

ances. Direct-vent draws combustion

air from the outdoors and vents to the

outdoors.

If the actual Btu/Hr used is less than the

maximum Btu/Hr the space can support, the

space is an unconfined space. You will need

no additional fresh air ventilation.

If additional ventilation to adjoining

room is supplied with grills or open-

ings, add the volume of these rooms to

the total volume of the space.

Continued

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CGN20TA

Blue Flame Vent-Free Natural Gas Heater

FRESH AIR FOR

COMBUSTION AND

12"

VENTILATION

Continued

WARNING:Iftheareainwhich

Ventilation Grills

the heater may be operated is

smaller than that defined as an

unconfined space, provide ad-

equate combustion and ventila-

tion air by one of the methods

described in the National Fuel

Gas Code, ANSI Z223.1, 1992,

Section 5.3 or applicable local

codes.

Into Adjoining Room,

Option 2

Ventilation

Grills

into Adjoining

Room,

Remove

Door into

Adjoining

Room,

Option 1

Option 3

VENTILATION AIR

Ventilation Air From Inside

Building

12"

Thisfreshairwouldcomefromanadjoining

unconfined space. When ventilating to an

adjoining unconfined space, you must pro-

vide 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 op-

tion 3, Figure 2). Follow the National Fuel

Gas Code NFPA 54/ANSI Z223.1, Section

5.3, Air for Combustion and Ventilation for

required size of ventilation grills or ducts.

Figure 2 - Ventilation Air from Inside Building

Ventilated

Attic

Outlet

Air

WARNING: Rework work-

sheet, adding the space of the

adjoining unconfined space. The

combined spaces must have

enough fresh air to supply all

appliances in both spaces.

Outlet

Air

To Attic

Crawl

Space

Ventilation Air From Outdoors

Provide extra fresh air by using ventilation

grills or ducts. You must provide two per-

manent openings: one within 12" of the

ceiling and one within 12" of the floor.

Connect these items directly to the outdoors

orspacesopentotheoutdoors.Thesespaces

include attics and crawl spaces.

Inlet

Air

Ventilated

Crawl Space

Inlet Air

IMPORTANT: Do not provide openings for

inlet or outlet air into attic if attic has a

thermostat-controlledpowervent.Heatedair

enteringtheatticwillactivatethepowervent.

Figure 3 - Ventilation Air from Outdoors

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OWNER’S MANUAL

IMPORTANT: Vent-free heaters add mois-

INSTALLATION

WARNING: Never install the

heater

ture to the air. Although this is beneficial,

installing heater in rooms without enough

ventilationairmaycausemildewtoformfrom

too much moisture. See Fresh Air for Com-

bustion and Ventilation, pages 4 through 6.

NOTICE: A qualified service per-

son must install heater. Follow

all local codes.

• in a bedroom or a bathroom

• in a recreational vehicle

• where curtains, furniture,

clothing, or other flammable

objectsarelessthan36inches

from the front, top, or sides of

the heater

• as a fireplace insert

• in high traffic areas

• in windy or drafty areas

CHECK GAS TYPE

CAUTION: If you install the

heater in a home garage

• heater pilot and burner must

be at least 18 inches above

floor

Use only natural gas. If your gas supply is

not natural gas, do not install heater. Call

dealer where you bought heater for proper

type heater.

• locateheaterwheremovingve-

hicle will not hit it

INSTALLATION ITEMS

Beforeinstallingheater,makesureyouhave

the items listed below.

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 in the air (such

as tobacco smoke) exist, may

discolor walls.

Forconvenienceandefficiency,installheater

• piping (check local codes)

• sealant (resistant to propane/LP gas)

• manual shutoff valve *

• 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 19. If plan-

ning to use fan, locate heater near an electri-

cal outlet.

• ground joint union

• test gauge connection * (see Figure 13,

page 10)

• sediment trap

• tee joint

• pipe wrench

CEILING

* AnA.G.A.design-certifiedmanualshutoff

valve with 1/8" NPT tap is an acceptable

alternative to test gauge connection. Pur-

chase the optional A.G.A. design-certified

manual shutoff valve from your dealer. See

Accessories, page 19.

36"

Minimum

From

Sides Of

Heater

LOCATING HEATER

This heater is designed to be mounted on a

wall.

WARNING:Maintainthemini-

mumclearancesshowninFigure

4.Ifyoucan,providegreaterclear-

ancesfromfloor,ceiling,andjoin-

ing wall.

Right

Side

Left

Side

Minimum To Top Surface

Of Carpeting, Tile Or Other

Combustible Material

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 19.

FLOOR

Figure 4 - Mounting Clearances As Viewed From Front of Heater

Continued

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CGN20TA

Blue Flame Vent-Free Natural Gas Heater

Methods For Attaching

Mounting Bracket To Wall

INSTALLING HEATER TO

WALL

INSTALLATION

Continued

Only use last hole on each end of mounting

bracket to attach bracket to wall. These two

holes are 16 inches apart from their centers.

Attach mounting bracket to wall in one of

two ways.

Mounting Bracket

THERMOSTAT SENSING

BULB

The mounting bracket is located on back

panel of heater. It has been taped there for

shipping. Remove mounting bracket from

back panel.

Thethermostatsensingbulbhasbeenplaced

inside the heater for protection during ship-

ping.

1. Attaching to wall stud

2. Attaching to wall anchor

Locating Thermostat Sensing

Bulb

1. Remove front panel of heater (see Fig-

ure 7, page 8).

Attaching to wall stud

This method provides the strongest hold.

Insert mounting screws through mounting

bracket and into wall studs.

2. Locate thermostat sensing bulb just

under burner assembly.

Mounting

Bracket

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 ma-

sonry).

IMPORTANT: Attach thermostat sensing

bulb to back of heater for proper operation.

Attaching Thermostat Sensing

Bulb

1. Remove thermostat sensing bulb from

holders inside heater. Route through

slot opening in bottom of heater.

Figure 6 - Bracket Location

Decidewhichmethodbettersuitsyourneeds.

Eithermethodwillprovideasecureholdfor

the mounting bracket.

Removing Front Panel Of Heater

1. Remove two screws near bottom cor-

ners of front panel.

Marking Screw Locations

2. Lift straight up on grill guard until it stops.

Grill guard will slide up about 1/4".

2. Place clamp on thermostat sensing bulb

as shown in Figure 5. Clamp is pro-

vided in hardware package.

1. Tape mounting bracket to wall where

heater will be located. Make sure

mounting bracket is level.

3. Pull bottom of front panel forward, then

downward.

3. 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 sens-

ing bulb is pointing up.

WARNING:Maintainminimum

clearances shown in Figure 8. If

you can, provide greater clear-

ancesfromfloorandjoiningwall.

4. Remove cardboard packing from grill

and glass.

Thermostat

Sensing Bulb

2. Mark screw locations on wall (see Fig-

ure 8).

Note: Only mark last hole on each end

of mounting bracket. Insert mounting

screws through these holes only.

Clamp

3. Remove tape and mounting bracket

from wall.

7 1/4"

Min.

16"

Figure 5 - Attaching Thermostat Sensing

Bulb

Only Insert Mounting

Screws Through Last

Hole On Each End

18 3/4"

Min.

Figure7-RemovingFrontPanelOfHeater

AjdoingWal

Floor

Figure 8 - Mounting Bracket Clearances

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OWNER’S MANUAL

3. Insert wall anchor (wings first) into

Installing Bottom Mounting

Screws

1. Locate two bottom mounting holes.

These holes are near bottom on back

panel of heater (see Figure 12).

INSTALLATION

hole. Tap anchor flush to wall.

Continued

4. For thin walls (1/2" or less), insert red

key into wall anchor. Push red key to

“pop” open anchor wings.

Attaching Mounting Bracket To

Wall

IMPORTANT: Do not hammer key!

2. Mark screw locations on wall.

Note: Wall anchors, mounting screws, and

spacers are in hardware package. The hard-

ware package is provided with heater.

For thick walls (over 1/2" thick) or solid

walls, do not pop open wings.

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 un-

der Attaching To Wall Anchor Method,

column 1.

Attaching to wall stud method

Forattachingmountingbrackettowallstuds

1. Drill holes at marked locations using

9/64" drill bit.

If installing bottom mounting screw

into wall stud, drill holes at marked lo-

cations using 9/64" drill bit.

Figure 10 - Popping Open Anchor Wings

For Thin Walls

2. Place mounting bracket onto wall. Line

up last hole on each end of bracket with

holes drilled in wall.

5. Place mounting bracket onto wall. Line

up last hole on each end of bracket with

wall anchors.

5. Replace heater onto mounting bracket.

3. Insert mounting screws through bracket

and into wall studs.

6. Place spacers between bottom mount-

ing holes and wall anchor or drilled

hole.

4. Tighten screws until mounting bracket

is firmly fastened to wall studs.

6. Insert mounting screws through bracket

and into wall anchors.

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.

7. Tighten screws until mounting bracket

is firmly fastened to wall.

Attaching to wall anchor method

For attaching mounting bracket to hollow

walls (wall areas between studs) or solid

walls (concrete or masonry)

Placing Heater On Mounting

Bracket

1. Locate two horizontal slots on back

panel of heater.

8. Tighten both screws until heater is

firmly secured to wall. Do not over

tighten.

1. Drill holes at marked locations using

5/16" drill bit. For solid walls (concrete

or masonry), drill at least 1" deep.

2. Place heater onto mounting bracket.

Slide horizontal slots onto stand-out

tabs on mounting bracket.

Note: Do not replace front panel at this

time. Replace front panel after making

gas connections and checking for leaks

(see pages 10 and 11).

2. Fold wall anchor as shown in Figure 9.

Horizontal Slots

Figure 9 - Folding Anchor

Stand-Out

Tab

Mounting Bracket

(attached to wall)

Figure 11 - Mounting Heater Onto

Mounting Bracket

Figure 12 - Installing Bottom Mounting

Screws

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CGN20TA

Blue Flame Vent-Free Natural Gas Heater

Apply pipe joint sealant lightly to male

CONNECTING TO

threads. This will prevent excess sealant

from going into pipe. Excess sealant in pipe

could result in clogged heater valves.

CAUTION: Use only new,

black iron or steel pipe. Inter-

nally-tinned copper tubing may

be used in certain areas. Check

yourlocalcodes.Usepipeoflarge

enough diameter to allow proper

gas volume to heater. If pipe is

too small, undue loss of pres-

sure will occur.

GAS SUPPLY

NOTICE: A qualified service per-

son must connect heater to gas

supply. Follow all local codes.

CAUTION:Usepipejointseal-

ant that is resistant to liquid pe-

troleum (LP) gas.

WARNING: Never connect

heater to private (non-utility) gas

wells. This gas is commonly

known as well-head gas.

Installsedimenttrapinsupplylineasshown

in Figure 13. Locate sediment trap where it

is within reach for cleaning. Locate sedi-

ment 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.

Typical Inlet Pipe Diameters

20,000 Btu/Hr

3/8" or greater

IMPORTANT: Check gas line pressure be-

fore connecting heater to gas line. Gas line

pressure must be no greater than 14 inches

of water. If gas line pressure is higher,

heater regulator damage could occur.

Installation must include a manual 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: Hold pressure regulator

with wrench when connecting it to gas pip-

ing and/or fittings.

Pressure

Regulator

3/8" NPT

Pipe Nipple

Heater

Cabinet

Ground Joint Union

Tee Joint

Manual

Shutoff

Valve *

Reducer

Bushing to

1/8" NPT

Test

Gauge

Connection*

Typical Inlet

Pipe from Gas

Meter (4" W.C.

to 10.5" W.C.

Pressure)

1/8" NPT

Plug Tap

Tee Joint

Pipe Nipple

Cap

Sediment

Trap

3" Minimum

Figure 13 - Gas Connection

* An A.G.A. design-certified manual shutoff valve with 1/8" NPT tap is an acceptable

alternative to test gauge connection. Purchase the optional A.G.A. design-certified manual

shutoff valve from your dealer. See Accessories, page 19.

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OWNER’S MANUAL

Test Pressures Equal To or

Less Than 1/2 PSIG

1. Close manual shutoff valve (see Fig-

ure 14).

PRESSURE TESTING

HEATER GAS

CONNECTIONS

1. Open manual shutoff valve (see Fig-

ure 14).

CHECKING GAS

CONNECTIONS

WARNING: Test all gas pip-

ing and connections for leaks

after installation or servicing.

Correct all leaks at once.

2. Pressurize supply piping system by ei-

ther using compressed air or opening

main gas valve located on or near gas

meter.

2. Open main gas valve located on or near

gas meter.

3. Make sure control knob of heater is in

the OFF position.

3. Check all joints from gas meter to

manual shutoff valve (see Figure 15).

Apply mixture of liquid soap and wa-

ter to gas joints. Bubbles forming show

a leak.

WARNING:Neveruseanopen

flame to check for a leak. Apply a

mixture of liquid soap and water

to all joints. Bubbles forming

show a leak. Correct all leaks at

once.

4. Check all joints from manual shutoff

valve to thermostat gas valve (see Fig-

ure 15). Apply mixture of liquid soap

and water to gas joints. Bubbles form-

ing show a leak.

4. Correct all leaks at once.

POSITION

Manual

Shutoff

Valve

5. Correct all leaks at once.

Open

6. Light heater (see Operating Heater,

pages 12 and 13). Check the rest of the

internal joints for leaks.

PRESSURE TESTING GAS

SUPPLY PIPING SYSTEM

7. Turn off heater (see To Turn Off Gas to

Appliance, page 12).

Test Pressures In Excess Of 1/2

PSIG

1. Disconnect heater and its individual

manual shutoff valve from gas supply

piping system. Pressures in excess of

1/2 psig will damage heater regulator.

OFF

Closed

POSITION

8. Replace front panel.

Figure 14 - Manual Shutoff Valve

2. Cap off open end of gas pipe where

manual shutoff valve was connected.

Thermostat Gas Valve

3. Pressurize supply piping system by ei-

ther using compressed air or

opening main gas valve located on or

near gas meter.

4. Check all joints of gas supply piping

system. Apply mixture of liquid soap

and water to gas joints. Bubbles form-

ing show a leak.

Gas Meter

5. Correct all leaks at once.

Manual

Shutoff

Valve

Figure 15 - Checking Gas Joints

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CGN20TA

Blue Flame Vent-Free Natural Gas Heater

Note: If pilot does not stay lit, refer

LIGHTING

INSTRUCTIONS

1. STOP! Read the safety information

above.

OPERATING

HEATER

to Troubleshooting, pages 14 through

16. Also contact a qualified service

person or gas supplier for repairs.

Until repairs are made, light pilot with

match. To light pilot with match, see

Manual Lighting Procedure, page 13.

FOR YOUR SAFETY

2. Make sure manual shutoff valve is

fully open.

READ BEFORE

LIGHTING

3. Turn control knob clockwise

7. Keep control knob pressed in for 30

seconds after lighting pilot. After 30

seconds, release control knob.

to the OFF position.

Clockwise

WARNING: If you do not fol-

low these instructions exactly, a

fireorexplosionmayresultcaus-

ing property damage, personal

injury or loss of life.

4. Wait five (5) minutes to clear out any

gas. Then smell for gas, including

near the floor. If you smell gas,

STOP! Follow “B” in the safety in-

formation in column 1. If you don’t

smell gas, go to the next step.

Note: If pilot goes out, repeat steps

3 through 7. This heater has a safety

interlock system. Wait one (1) minute

before lighting pilot again.

A. This appliance has a pilot which must

be lighted by hand. When lighting the

pilot, follow these instructions ex-

actly.

8. Turn control knob counterclockwise

C-clockwise

5. Turn control knob counterclockwise

to desired heating level. The

C-clockwise

to the PILOT position.

Press in control knob for five (5) sec-

onds (see Figure 16).

main burner should light. Set control

knob to any heat level between HI

and LO.

B. BEFORE LIGHTING smell all

around the appliance area for gas. Be

sure to smell next to the floor because

some gas is heavier than air and will

settle on the floor.

Note: You may be running this

heater for the first time after hook-

ing up to gas supply. If so, the con-

trol knob may need to be pressed in

for 30 seconds. This will allow air to

bleed from the gas system.

Ignitor Electrode

Thermocouple

Pilot Burner

WHAT TO DO IF YOU SMELL

GAS

• If control knob does not pop up

when released, contact a qualified

service person or gas supplier for

repairs.

• Do not try to light any appliance.

• Do not touch any electric switch;

do not use any phone in your build-

ing.

• Immediately call your gas supplier

from a neighbor’s phone. Follow

the gas supplier’s instructions.

• If you cannot reach your gas sup-

plier, call the fire department.

6. With control knob pressed in, push

down and release ignitor button. This

will light pilot. The pilot is attached

to the front of burner. The pilot can

be seen through the glass panel. If

needed, keep pressing ignitor button

until pilot lights.

Figure 17 - Pilot

CAUTION:Donottrytoadjust

heating levels by using the

manual shutoff valve.

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

qualified service technician or gas

supplier. Force or attempted repair

may result in a fire or explosion.

Ignitor Button

Control Knob

TO TURN OFF GAS

TO APPLIANCE

Shutting Off Heater

O F F

I L

D. Do not use this appliance if any part

has been under water. Immediately

call a qualified service technician to

inspect the appliance and to replace

any part of the control system and

any gas control which has been un-

der water.

H I

1. Turn control knob clockwise

IGNITOR

to the OFF position.

Clockwise

2. Turn off all electric power to the ap-

pliance if service is to be performed.

Figure 16 - Control Knob In The OFF

Position

Shutting Off Burner Only (pilot

stays lit)

1. Turn control knob clockwise

to the PILOT position.

Clockwise

104190

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OWNER’S MANUAL

BURNER FLAME PATTERN

OPERATING

INSPECTING

BURNER

Figure 20 shows a correct burner flame

pattern.Figure21showsanincorrectburner

flame pattern. The incorrect burner flame

patternshowsyellowtippingoftheflame. It

also shows the flame higher than 1/2 the

glass panel height.

HEATER

Continued

Check pilot flame pattern and burner flame

pattern often.

THERMOSTAT CONTROL

OPERATION

PILOT FLAME PATTERN

Figure 18 shows a correct pilot flame pat-

tern. Figure 19 shows an incorrect pilot

flame pattern. The incorrect pilot flame is

not touching the thermocouple. This will

cause the thermocouple to cool. When the

thermocouple cools, the heater will shut

down.

The thermostatic control used on these

models differs from standard thermo-

stats. Standard thermostats simply turn

on and off the burner. The thermostat

used on this heater senses the room tem-

perature. The thermostat adjusts the

amount of gas flow to the burner. This

increases or decreases the burner flame

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 HI and LO.

WARNING: If yellow tipping

occurs, your heater could pro-

duce increased levels of carbon

monoxide. If burner flame pat-

tern shows yellow tipping, follow

instructions at bottom of this

page.

Pilot Burner

Thermocouple

NOTICE: Do not mistake orange

flames with yellow tipping. Dirt

or other fine particles enter the

heater and burn causing brief

patches of orange flame.

Note: The thermostat sensing bulb mea-

sures the temperature of air near the

heatercabinet.Thismaynotalwaysagree

with room temperature (depending on

housing construction, installation loca-

tion, room size, open air temperatures,

etc.). Frequent use of your heater will let

you determine your own comfort levels.

Figure 18 - Correct Pilot Flame Pattern

1/2 G

Glass

Height

CORRECT FLAME PATTERN

Correct Flame Pattern

At^AH^{T H}ig^IGh^{H P}P^Oo^SIs^Ti^IOti^Non

MANUAL LIGHTING

PROCEDURE

Pilot Burner

Figure 20 - Correct Burner Flame Pattern

Thermocouple

Yellow Tipping

1. Remove front panel (see Figure 7,

page 8).

2. Follow steps 1 through 5 under Light-

ing Instructions, page 12.

1/2

Glass

Height

3. With control knob pressed in, strike

match. Hold match to pilot until pi-

lot lights.

INCORRECT FLAME PATTERN

Incorrect Flame Pattern

AT HIGH POSITION

At High Position

Figure 19 - Incorrect Pilot Flame Pattern

4. Keep control knob pressed in for 30

seconds after lighting pilot. After 30

seconds, release control knob.

If pilot flame pattern is incorrect, as shown

in Figure 19.

Figure21-IncorrectBurnerFlamePattern

Ifburnerflamepatternisincorrect,asshown

in Figure 21

• turn heater off (see To Turn Off Gas to

Appliance, page 12).

5. Replace front panel.

• turn heater off (see To Turn Off Gas to

Appliance, page 12)

• see Troubleshooting, pages 14 through 16.

• see Troubleshooting, pages 14 through 16

104190

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CGN20TA

Blue Flame Vent-Free Natural Gas Heater

TROUBLESHOOTING

WARNING: Turn off and un-

plug heater and let cool before

servicing. Only a qualified ser-

vice person should service and

repair heater.

CAUTION: Never use a wire,

needle, or similar object to clean

ODS/pilot.ThiscandamageODS/

pilot unit.

Note:Alltroubleshootingitemsarelistedin

order of operation.

OBSERVED PROBLEM

POSSIBLE CAUSE

REMEDY

When ignitor button is pressed, there is no 1. Ignitor electrode positioned wrong

spark at ODS/pilot 2. Ignitor electrode broken

1. Replace ignitor

2. Replace ignitor

3. Ignitor electrode not connected to igni- 3. Reconnect ignitor cable

tor cable

4. Ignitor cable pinched or wet

5. Piezo ignitor nut is loose

4. Free ignitor cable if pinched by any

metal or tubing. Keep ignitor cable dry

5. Tighten nut holding piezo ignitor to

heater cabinet. Nut is located inside

heater cabinet at top

6. Broken ignitor cable

7. Bad piezo ignitor

6. Replace ignitor cable

7. Replace piezo ignitor

When ignitor button is pressed, there is 1. Gas supply turned off or manual shutoff 1. Turn on gas supply or open manual

spark at ODS/pilot but no ignition

valve closed

shutoff valve

2. Control knob not in PILOT position

2. Turn control knob to PILOT position

3. Control knob not pressed in while in PI- 3. Press in control knob while in PILOT

LOT position

position

4. Air in gas lines when installed

4. Continue holding down control knob.

Repeat igniting operation until air is re-

moved

5. ODS/pilot is clogged

5. Clean ODS/pilot (see Cleaning and

Maintenance, page17) or replace ODS/

pilot assembly

6. Gas regulator setting is not correct

6. Replace gas regulator

ODS/pilot lights but flame goes out when 1. Control knob not fully pressed in

1. Press in control knob fully

control knob is released

2. Control knob not pressed in long enough 2. After ODS/pilot lights, keep control

knob pressed in 30 seconds

3. Safety interlock system has been trig- 3. Wait one (1) minute for safety interlock

gered (Thermostat models only)

system to reset. Repeat ignition operation

4. Manual shutoff valve not fully open

4. Fully open manual shut-off valve

5. Thermocouple connection loose at con- 5. Hand tighten until snug, then tighten 1/4

trol valve turn more

6. Pilot flame not touching thermocouple, 6. A) Contact local natural gas company

which allows thermocouple to cool,

causing pilot flame to go out. This prob-

lem could be caused by one or both of

the following:

B) Clean ODS/pilot (see Cleaning and

Maintenance, page 17) or replace ODS/

pilot assembly

A) Low gas pressure

B) Dirty or partially clogged ODS/

pilot

7. Thermocouple damaged

8. Control valve damaged

7. Replace thermocouple

8. Replace control valve

104190

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OWNER’S MANUAL

TROUBLESHOOTING

Continued

OBSERVED PROBLEM

POSSIBLE CAUSE

REMEDY

Burner does not light after ODS/pilot is lit

1. Burner orifice is clogged

1. Clean burner (see Cleaning and Mainte-

nance, page 17) or replace burner orifice

2. Burner orifice diameter is too small

3. Inlet gas pressure is too low

2. Replace burner orifice

3. Contact local natural gas company

Delayed ignition of burner

1. Manifold pressure is too low

2. Burner orifice is clogged

1. Contact local natural gas company

2. Clean burner (see Cleaning and Mainte-

nance, page 17) or replace burner orifice

Burner backfiring during combustion

1. Burner orifice is clogged or damaged

1. Clean burner (see Cleaning and Mainte-

nance, page 17) or replace burner orifice

2. Replace burner

2. Burner damaged

3. Gas regulator defective

3. Replace gas regulator

Yellow flame during burner combustion

1. Not enough air

1. Check burner for dirt and debris. If

found, clean burner (see Cleaning and

Maintenance, page 17)

2. Gas regulator defective

2. Replace gas regulator

Slight smoke or odor during initial opera- 1. Residues from manufacturing processes 1. Problem will stop after a few hours of

tion operation

Heater produces a whistling noise when 1. Turning control knob to HI position 1. Turn control knob to LO position and

burner is lit

when burner is cold

2. Air in gas line

let warm up for a minute

2. Operate burner until air is removed from

line. Have gas line checked by local

natural gas company

3. Air passageways on heater blocked

3. Observe minimum installation clear-

ances (see Figure 4, page 7)

4. Dirty or partially clogged burner orifice 4. Clean burner (see Cleaning and Mainte-

nance, page 17) or replace burner orifice

Continued

104190

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CGN20TA

Blue Flame Vent-Free Natural Gas Heater

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.

• Immediatelycallyourgassupplierfromaneighbor’sphone. Followthe

gas supplier’s instructions.

• If you cannot reach your gas supplier, call the fire 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

POSSIBLE CAUSE

REMEDY

Heater produces a clicking/ticking noise 1. Metal expanding while heating or con- 1. This is common with most heaters. If

just after burner is lit or shut off

tracting while cooling

noise is excessive, contact qualified ser-

vice person

Heater produces unwanted odors

1. Heater burning vapors from paint, hair 1. Ventilate room. Stop using odor caus-

spray, glues, etc. See IMPORTANT

ing products while heater is running

statement above).

2. Gas leak. SeeWarning statement at 2. Locate and correct all leaks (see Check-

top of page

ing Gas Csonnections, page 11)

Heater shuts off in use (ODS operates)

1. Not enough fresh air is available

2. Low line pressure

3. ODS/pilot is partially clogged

1. Open window and/or door for ventilation

2. Contact local propane/LP gas company

3. Clean ODS/pilot (see Cleaning and

Maintenance, page 17)

Gas odor even when control knob is in OFF 1. Gas leak. SeeWarning statement at 1. Locate and correct all leaks (see Check-

position

top of page

ing Gas Connections, page 11)

2. Control valve defective

2. Replace control valve

Gas odor during combustion

1. Foreign matter between control valve 1. Take apart gas tubing and remove for-

and burner eign matter

2. Gas leak. SeeWarning statement at 2. Locate and correct all leaks (see Check-

top of page ing Gas Connections, page 11)

Moisture/condensationnoticedonwindows 1. Not enough combustion/ventilation air. 1. Refer to Air for Combustion and Venti-

lation requirements (page 4)

104190

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OWNER’S MANUAL

CLEANING

AND

SPECIFICATIONS

CGN20TA

10,000/20,000

Natural Only

Piezo

Btu (Variable)

Type Gas

Ignition

MAINTENANCE

Pressure Regulator Setting

Inlet Gas Pressure (in. of water)

Maximum

3" W.C.

WARNING: Turn off heater

and let cool before cleaning.

10.5"

Minimum

Dimensions, Inches (H x W x D)

Heater

Carton

Weight (pounds)

Heater

23.5 x 18.5 x 8.0

25.8 x 21.3 x 10.1

CAUTION: You must keep

controlareas,burner,andcircu-

latingairpassagewaysofheater

clean. Inspect these areas of

heater before each use. Have

heater inspected yearly by a

qualified service person. Heater

may need more frequent clean-

ing due to excessive lint from

carpeting,beddingmaterial,etc.

Shipping

REPLACEMENT

PARTS

TECHNICAL

SERVICE

Note: Use only original replacement parts.

Thiswillprotectyourwarrantycoveragefor

parts replaced under warranty.

You may have further questions about in-

stallation, operation, or troubleshooting.

If so, contact DESA International’s

ODS/PILOT AND BURNER

• Use a vacuum cleaner, pressurized air,

or small, soft bristled brush to clean.

Parts Under Warranty

Technical Service Department at

1-800-323-5190.

Contact authorized dealers of this product.

If they can’t supply original replacement

CABINET

part(s), either contact your nearest Parts SERVICE HINTS

Central (see below) or call DESA

Air Passageways

• Use a vacuum cleaner or pressurized air

to clean.

When gas pressure is too low

• pilot will not stay lit

International’s Technical Service Depart-

ment at 1-800-323-5190 for referral infor-

mation.

• burner will have delayed ignition

• heater will not produce specified heat

When calling DESA International, have

ready

Exterior

• Use a soft cloth dampened with a mild

soap and water mixture. Wipe the cabi-

net to remove dust.

When gas quality is bad

• pilot will not stay lit

• your name

• your address

• model number of your heater

• how heater was malfunctioning

• type of gas used (propane/LP or natural

gas)

• burner will produce flames and soot

• heater will backfire when lit

SERVICE

Youmayfeelyourgaspressureistoolowor

gas quality is bad. If so, contact your local

natural gas supplier.

PUBLICATIONS

• purchase date

Youcanpurchaseaservicemanualfromthe

address listed on the back page of this

manual. Send a check for $5.00 payable to

DESA International.

Usually, we will ask you to return the defec-

tive 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 below) or call DESA

International’s Parts Department at 1-800-

972-7879 for referral information.

When calling DESA International, have

ready

• model number of your heater

• the replacement part number

104190

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CGN20TA

Blue Flame Vent-Free Natural Gas Heater

These Parts Centrals are privately owned businesses. They have agreed to support our

customer’s needs by providing original replacement parts and accessories.

PARTS CENTRALS

Baltimore Electric

1348 Dixwell Avenue

Hamden, CT 06514

1-800-397-7553

Washer Equipment Co.

1715 Main Street

Kansas City, MO 64108

KS, MO, AR

816-842-3911

Dayton Hardware

P.O. Box 275

North Dayton Station

Dayton, OH 45404

All States

203-248-7553

Parts Department

513-258-3721

OH 1-800-762-3426

East Coast Energy

Products

833 Broadway

W. Long Branch, NJ 07764

908-870-8809

Portable Heater Parts

342 N. County Rd. 400 East

Valparaiso, IN 46383

All States

Halco Enterprises

208 Carter Drive, Unit 21

West Chester, PA 19382

215-696-2670

219-462-7441

1-800-755-8809

1-800-362-6951

1-800-368-0803

Tarantin Tank Co.

P.O. Box 6129

Freehold, NJ 07728

908-780-9340

FBD

LA Porte's Parts & Service

2444 N. 5th Street

Hartsville, SC 29550

803-332-0191

Parts Department

P.O. Box 1096

1720 Kummer Road

Franklin, KY 42134

502-586-1922

1-800-654-8534

1-800-922-0724

Albany Ladder

1586-90 Central Avenue

Albany, NY 12205

NY, MA, VT

Cans Unlimited, Inc.

P.O. Box 645

Taylor, SC 29687

All States

Four Flags Power Products

1115 Stateline Road

Niles, MI 49120

518-869-5335

616-684-2697

1-800-354-7368

803-879-3009

1-800-268-4983

1-800-845-5301

Master Service Center

1184 Wilson NW

Walker, MI 49504

616-791-4760

1-800-446-1446

104190

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OWNER’S MANUAL

FAN KITS - GA3100A AND

GA3200TA

ACCESSORIES

Purchasetheseheateraccessoriesfromyour

local dealer. If they can not supply these

accessories,eithercontactyournearestParts

Central (see page 18) or call DESA

International’s Parts Department at 1-800-

972-7879 for referral information. You can

also write to the address listed on the back

page of this manual.

For all models. Provides better heat distri-

bution. Makes heater more efficient. Com-

plete installation and operating instructions

included.

Manually controlled - GA3100A. Includes

ON/OFF switch.

Thermostatically controlled - GA3200TA.

Includes three settings: ON/OFF/AUTO.

FLOOR MOUNTING STAND

- GA4500 - Champagne

For locating heater on the floor, away from

a wall. Complete installation instructions

included.

MANUAL SHUTOFF

VALVE - GA5010

Forallmodels.Manualshutoffvalvewith1/8"

NPT tap.

104190

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CGN20TA

Blue Flame Vent-Free Natural Gas Heater

ILLUSTRATED

PARTS

BREAKDOWN

CGN20TA

12-1

12-2

12 ODS/Pilot Assembly

104190

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OWNER’S MANUAL

This list contains replaceable parts used in your heater. When ordering parts, follow the

instructions listed under Replacement Parts on page 17 of this manual.

PARTS LIST

CGN20TA

KEY

PART

NO.

NUMBER

DESCRIPTION

QTY.

098304-01

098742-03

103476-01

101108-01

098533-04AA

098260-09

098532-04AA

M11084-26

098352-04BR

098271-02

098249-01

099440-05

098514-01

098515-01

099120-02

098517-01

098250-01

098251-09

099415-07

099553-01

103255-01

103256-01

098522-10

098530-05

097159-04

M11084-26

M11084-38

099066-01

Screw, #10 x 3/8"

Front Panel for CGN20TA (Champagne)

Grill Guard

Removable Speed Clip

Bottom Glass Retainer

Glass Panel

Top Glass Retainer

Screw, #10 x 3/8"

Deflector Unit

Ignitor Cable

Nut, M5

ODS/Pilot Assembly

Thermocouple

Ignitor Electrode

Burner

3/16" Pilot Tubing

Injector Holder

Injector

Pressure Regulator

Pilot Shield

3/8" Outlet (Burner) Tubing

3/8" Inlet Tubing

Thermostat Gas Valve

Cabinet for CGN20TA (Woodgrain)

Piezo Ignitor

Screw, #10 x 3/8"

Screw, #8 x 3/8"

Mounting Bracket

12-1

12-2

PARTS AVAILABLE — NOT SHOWN

098305-01

100642-01

Control Position Label

Hardware Assembly

104190

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CGN20TA

Blue Flame Vent-Free Natural Gas Heater

NOTES

_______________________________________________________________________________________________

104190

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OWNER’S MANUAL

NOTES

_______________________________________________________________________________________________

104190

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WARRANTY INFORMATION

KEEP THIS WARRANTY

Model

Serial No.

Date Purchased

Always specify model and serial numbers when communicating with the factory.

We reserve the right to amend these specifications at any time without notice. The only warranty applicable is our

standard written warranty. We make no other warranty, expressed or implied.

LIMITED WARRANTY

COMFORT GLOW VENT-FREE NATURAL GAS HEATERS

DESAInternationalwarrantsthisproducttobefreefromdefectsinmaterialsandcomponentsfortwo(2)yearsfrom

the date of first purchase, provided that the product has been properly installed, operated and maintained in

accordance with all applicable instructions. To make a claim under this warranty the Bill of Sale or cancelled check

must be presented.

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 Authorized

Service Center. Warranty part(s) MUST be obtained through authorized dealers of this product and/or DESA

International who will provide original factory replacement parts. Failure to use original factory replacement parts

voids this warranty. The heater MUST be installed by a qualified 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 FROM THE DATE OF FIRST PURCHASE; AND DESA INTERNATIONAL’S LIABILITY IS

HEREBY LIMITED TO THE PURCHASE PRICE OF THE PRODUCT AND DESA INTERNATIONAL

SHALL NOT BE LIABLE FOR ANY OTHER DAMAGES WHATSOEVER INCLUDING INDIRECT, INCI-

DENTAL OR CONSEQUENTIAL DAMAGES.

Somestatesdonotallowalimitationonhowlonganimpliedwarrantylastsoranexclusionorlimitationofincidental

orconsequentialdamages, sotheabovelimitationonimpliedwarranties, orexclusionorlimitationondamagesmay

not apply to you.

This warranty gives you specific legal rights, and you may also have other rights that vary from state to state.

For information about this warranty write:

104190 01

2701 Industrial Drive

P.O. Box 90004

Bowling Green, KY 42102-9004

104190-01

REV. A

09/97

NOT A UPC

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