Desa Tech Electric Heater CGN20T User Manual

BLUE FLAME VENT-FREE NATURAL GAS HEATER

OWNER’S OPERATION AND INSTALLATION MANUAL

CGN20T

CGN20TL

CGN30T

CGN30TL

Heater Sizes: 20,000 Btu/Hr Thermostat and

30,000 Btu/Hr Thermostat Model Heaters

WARNING: This is an

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.

unvented gas-fired heater.

It uses air (oxygen) from

the room in which it is

installed. Provisions for

adequate combustion

must be provided. Refer to

page 5 of this manual

— 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

This appliance may be in-

stalled in an aftermarket*

manufactured (mobile) home,

where not prohibited by state

• 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.

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 appli-

ance is not convertible for

use with other gases.

— Installation and service must be performed by

a qualified installer, service agency, or the

gas supplier.

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SAFETY

WARNINGSContinued

INFORMATION

WARNING: Any change to this heater or its controls can be dangerous.

Continued

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. 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

3. This heater shall not be installed in a bedroom or bathroom.

4. Never install the heater

• in a recreational vehicle

• where curtains, furniture, clothing, or other flammable objects are less than

36 inches from the front, top, or sides of the heater

• as a fireplace insert

• in high traffic areas

• in windy or drafty areas

5. This heater needs fresh, outside air ventilation to run properly. This heater has

an oxygen depletion sensor (ODS) pilot light safety system. The ODS shuts

down the heater if not enough fresh air is available. See Fresh Air for Combus-

tion and Ventilation, pages 5 through 8.

6. Keep air openings in front and bottom of heater clear and free of debris. This will

ensure 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. Never place any objects on the heater.

10. 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.

11. Carefully supervise young children when they are in the same room with

heater.

12. Make sure grill guard is in place before running heater.

13. Do not use heater if any part has been under water. Immediately call a qualified

service technician to inspect the room heater and to replace any part of the

control system and any gas control which has been under water.

14. Turn off and unplug heater and let cool before servicing. Only a qualified

service person should service and repair heater.

15. Operating heater above elevations of 4,500 feet could cause pilot outage.

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Ignitor Button

Control Knob

PRODUCT

IDENTIFICATION

Grill

Guard

Glass

Panel

Front

Panel

Heater

Cabinet

Figure 1 - Vent-Free Natural Gas Heater (30,000 Btu/Hr Model Shown)

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*.

LOCAL CODES

UNPACKING

*Available from:

American National Standards Institute, Inc.

1430 Broadway

New York, NY 10018

National Fire Protection Association, Inc.

Batterymarch Park

Quincy, MA 02269

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.

Safety Device

PRODUCT

FEATURES

This heater has a pilot with an Oxygen Depletion Sensor Shutoff System (ODS). 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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FRESH AIR

FOR

COMBUSTION

AND

WARNING

WARNING ICON

001

This heater shall not be installed in a confined space unless provi-

sions are provided for adequate combustion and ventilation air.

Read the following instructions to insure proper fresh air for this

and other fuel-burning appliances in your home.

Today’s homes are built more energy 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.

VENTILATION

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 is exerpts from National Fuel Gas Code. NFPA 54/ANSI Z223.1,

Section 5.3, Air for Combustion and Ventilation.

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 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 continu-

ous water vapor retarder with a rating of one perm (6x10^-11per 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,

betweenwallpanels, atpenetrationsforplumbing, electrical, andgaslines,

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 8.

If your home does not meet all of the three criteria above, proceed to page 6.

Confined and Unconfined Space

The National Fuel Gas Code (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 m³per 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 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.

** Cubic feet equals length x width x height of room.

Continued

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DETERMINING FRESH-AIR FLOW FOR HEATER LOCATION

FRESH AIR

FOR

Determining if You Have a Confined or Unconfined Space

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

COMBUSTION

AND

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).

VENTILATION

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)

Continued

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. Divide the space volume by 50 cubic feet to determine the maximum Btu/Hr the

space can support.

___________ (volume of space) ÷ 50 cu. ft. = (Maximum Btu/Hr the space can

support)

Example: 2560 cu. ft. (volume of space) ÷ 50 cu. ft. = 51.2 or 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

Gas water heater*

Gas furnace

Vented gas heater

Gas fireplace logs

_________________ Btu/Hr

Other gas appliances* + _________________ Btu/Hr

Total

= _________________ Btu/Hr

Example: Gas water heater

Vent-free heater

Total

40,000

20,000

60,000

Btu/Hr

* Do not include direct-vent gas appliances. Direct-vent draws combustion air

from the outdoors and vents to the outdoors.

4. Compare the maximum Btu/Hr the space can support with the actual amount of

Btu/Hr used.

_______________ Btu/Hr (maximum the space can support)

_______________ Btu/Hr (actual amount of Btu/Hr used)

Example: 51,200 Btu/Hr (maximum the space can support)

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 8.

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

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.

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FRESH AIR

FOR

COMBUSTION

AND

WARNING

If the area in which the heater may be operated is smaller than that

defined as an unconfined space, provide adequate combustion and

ventilation air by one of the methods described in the National Fuel

Gas Code, ANSI Z223.1, 1992, Section 5.3 or applicable local codes.

VENTILATION

VENTILATION AIR

Ventilation Air From Inside Building

Continued

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 NFPA 54/ANSI

Z223.1, Section 5.3, Air for Combustion and Ventilation for required size of ventila-

tion grills or ducts.

WARNING

Rework worksheet, adding the space of the adjoining unconfined

space. The combined spaces must have enough fresh air to supply all

appliances in both spaces.

12"

Ventilation Grills

Into Adjoining Room,

Ventilation

Grills

Option 2

into Adjoining

Room,

Remove

Door into

Adjoining

Room,

Option 1

Option 3

12"

Figure 2 - Ventilation Air from Inside Building

Continued

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Ventilation Air From Outdoors

FRESH AIR

FOR

COMBUSTION

AND

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.

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.

VENTILATION

Continued

Ventilated

Outlet

Attic

Air

Outlet

Air

To Attic

Crawl

Space

Inlet

Air

Ventilated

Inlet Air

Crawl Space

Figure 3 - Ventilation Air from Outdoors

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INSTALLINGTO

WALL

NOTICE

A qualified service person must install heater. Follow all local codes.

CHECK GAS TYPE

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.

INSTALLATION ITEMS

Before installing heater, make sure you have the items listed below.

• piping (check local codes)

• sealant (resistant to propane/LP gas)

• manual shutoff valve *

• ground joint union

• test gauge connection * (see

Figure 12, page 15)

• sediment trap

• tee joint

• pipe wrench

* 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 30.

LOCATING HEATER

This heater is designed to be mounted on a wall.

WARNING

Maintain the minimum clearances shown in Figure 4 (page 10). 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 30.

WARNING

Never install the heater

• in a bedroom or a bathroom

• in a recreational vehicle

• where curtains, furniture, clothing, or other flammable objects are

less than 36 inches 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 in the air (such

as tobacco smoke) exist, may discolor walls.

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 Fresh Air for Combustion and Ventilation, pages 5

through 8.

Continued

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INSTALLINGTO

WALL

CAUTION

If you install the heater in a home garage

• heater pilot and burner must be at least 18 inches above floor

• locate heater where moving vehicle will not hit it

Continued

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 30. If plan-

ning to use fan, locate heater near an electrical outlet.

CEILING

36"

Minimum

From

Sides Of

Heater

Left

Side

Right

Side

Minimum To Top Surface

Of Carpeting, Tile Or Other

Combustible Material

FLOOR

Figure 4 - Mounting Clearances As Viewed From Front of Heater

THERMOSTAT SENSING BULB

The thermostat sensing bulb has been placed inside the heater for protection during

shipping.

Locating Thermostat Sensing Bulb

1. Remove front panel of heater (see Figure 7, page 11).

2. Locate thermostat sensing bulb just under burner assembly.

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.

2. Place clamp on thermostat sensing bulb as shown in Figure 5. Clamp is provided in

hardware package.

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 sensing

bulb is pointing up.

Thermostat

Sensing Bulb

Clamp

Figure 5 - Attaching Thermostat Sensing Bulb

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INSTALLING HEATER TO WALL

Mounting Bracket

The mounting bracket is located on back panel of heater. It has been taped there for

shipping. Remove mounting bracket from back panel.

INSTALLINGTO

WALL

Continued

Mounting

Bracket

Figure 6 - Bracket Location

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 downward.

4. Remove cardboard packing from grill and glass.

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 16 inches 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.

Continued

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Marking Screw Locations

1. Tape mounting bracket to wall where heater will be located. Make sure mounting

bracket is level.

INSTALLINGTO

WALL

Continued

WARNING

Maintain minimum clearances shown in Figure 8. If you can, provide

greater clearances from floor and joining wall.

2. Mark screw locations on wall (see Figure 8).

Note: Only mark last hole on each end of mounting bracket. Insert mounting

screws through these holes only.

3. Remove tape and mounting bracket from wall.

11"

Min.

7 1/4"

Min.

16"

Only Insert Mounting

Screws Through Last

Hole On Each End

Only Insert Mounting

Screws Through Last

Hole On Each End

18 3/4"

Min.

18 3/4"

Min.

AjdoingWal

Floor

30,000 Btu/Hr Model

20,000 Btu/Hr Models

Figure 8 - Mounting Bracket Clearances

Attaching Mounting Bracket To Wall

Note: Wall anchors, mounting screws, and spacers are in hardware package. The

hardware package is provided with heater.

Attaching to wall stud method

For attaching mounting bracket to wall studs

1. Drill holes at marked locations using 9/64" drill bit.

2. Place mounting bracket onto wall. Line up last hole on each end of bracket with

holes drilled in wall.

3. Insert mounting screws through bracket and into wall studs.

4. Tighten screws until mounting bracket is firmly fastened to wall studs.

Attaching to wall anchor method

For attaching mounting bracket to hollow walls (wall areas between studs) or solid

walls (concrete or masonry)

1. Drill holes at marked locations using 5/16" drill bit. For solid walls (concrete or

masonry), drill at least 1" deep.

2. Fold wall anchor as shown in Figure 9.

Figure 9 - Folding Anchor

3. Insert wall anchor (wings first) into hole. Tap anchor flush to wall.

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4. For thin walls (1/2" or less), insert red key into wall anchor. Push red key to “pop”

open anchor wings. IMPORTANT: Do not hammer key!

INSTALLINGTO

WALL

For thick walls (over 1/2" thick) or solid walls, do not pop open wings.

Continued

Figure 10 - Popping Open Anchor Wings For Thin Walls

5. Place mounting bracket onto wall. Line up last hole on each end of bracket with

wall anchors.

6. Insert mounting screws through bracket and into wall anchors.

7. Tighten screws until mounting bracket is firmly fastened to wall.

Placing Heater On Mounting Bracket

1. Locate two horizontal slots on back panel of heater.

2. Place heater onto mounting bracket. Slide horizontal slots onto stand-out tabs on

mounting bracket.

Horizontal Slots

Stand-Out Tab

Mounting Bracket

(attached to wall)

Figure 11 - Mounting Heater Onto Mounting Bracket

Installing Bottom Mounting Screws

1. Locate two bottom mounting holes. These holes are near bottom on back panel of

heater (see Figure 12).

2. Mark screw locations on wall.

3. Remove heater from mounting bracket.

4. If installing bottom mounting screws into hollow or solid wall, install wall anchors.

Follow steps 1 through 4 under Attaching To Wall Anchor Method, page 12.

If installing bottom mounting screw into wall stud, drill holes at marked locations

using 9/64" drill bit.

5. Replace heater onto mounting bracket.

6. Place spacers between bottom mounting holes and wall anchor or drilled hole.

7. Hold spacer in place with one hand. With other hand, insert mounting screw

through bottom mounting hole and spacer. Place tip of screw in opening of wall

anchor or drilled hole.

8. Tighten both screws until heater is firmly 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 14-16). Make gas connections and

check for leaks before replacing front panel (see pages 14-16).

Figure 12 - Installing Bottom Mounting Screws

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CONNECTING

TO GAS

NOTICE

A qualified service person must connect heater to gas supply. Fol-

low all local codes.

SUPPLY

WARNING

Never connect heater to private (non-utility) gas wells. This gas is

commonly known as well-head gas.

IMPORTANT: Check gas line pressure before 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.

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 pressure will occur.

Typical Inlet Pipe Diameters

20,000 Btu/Hr Models

30,000 Btu/Hr Model

3/8" or greater

1/2" or greater

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, page 15).

Apply pipe joint sealant lightly to male threads. This will prevent excess sealant from

going into pipe. Excess sealant in pipe could result in clogged heater valves.

CAUTION

Use pipe joint sealant that is resistant to liquid petroleum (LP) gas.

Install sediment trap in supply line as shown in Figure 13, page 15. 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.

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IMPORTANT: Holdpressureregulatorwithwrenchwhenconnectingittogaspipingand/

or fittings.

CONNECTING

TO GAS

Pressure

Regulator

SUPPLY

Continued

3/8" NPT

Pipe Nipple

Heater

Cabinet

Ground Joint Union

Tee Joint

Manual

Shutoff

Valve *

Test

Gauge

Connection *

Reducer

Bushing to

1/8" NPT

Typical Inlet Pipe from

Gas Meter

(4" W.C. to

10.5" W.C. Pressure)

1/8" NPT

Plug Tap

Tee Joint

Sediment

Trap

Pipe

Nipple

3" Minimum

Cap

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 30.

CHECKING

GAS

CONNECTIONS

WARNING

Test all gas piping and connections for leaks after installation or

servicing. Correct all leaks at once.

WARNING

Never use an open 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.

PRESSURE TESTING GAS SUPPLY PIPING SYSTEM

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.

2. Cap off open end of gas pipe where manual shutoff valve was connected.

3. Pressurize supply piping system by either using compressed air or

opening main gas valve located on or near gas meter.

Continued

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4. Check all joints of gas supply piping system. Apply mixture of liquid soap and

water to gas joints. Bubbles forming show a leak.

5. Correct all leaks at once.

CHECKING

GAS

Test Pressures Equal To or Less Than 1/2 PSIG

1. Close manual shutoff valve (see Figure 14).

2. Pressurize supply piping system by either using compressed air or opening main

gas valve located on or near gas meter.

CONNECTIONS

Continued

3. Check all joints from gas meter to manual shutoff valve (see Figure 15). Apply

mixture of liquid soap and water to gas joints. Bubbles forming show a leak.

4. Correct all leaks at once.

PRESSURE TESTING HEATER GAS CONNECTIONS

1. Open manual shutoff valve (see Figure 14).

2. Open main gas valve located on or near gas meter.

3. Make sure control knob of heater is in the OFF position.

4. Check all joints from manual shutoff valve to thermostat gas valve (see Figure 15).

Apply mixture of liquid soap and water to gas joints. Bubbles forming show a

leak.

5. Correct all leaks at once.

6. Light heater (see Operating Heater, pages 17 through 19). Check the rest of the

internal joints for leaks.

7. Turn off heater (see To Turn Off Gas to Appliance, page 19).

8. Replace front panel.

O^ON

^ITe^ION

Manual

Shutoff

Valve

OFF

POSITION

Closed

Figure 14 - Manual Shutoff Valve

Thermostat Gas Valve

Gas Meter

Manual

Shutoff

Valve

Figure 15 - Checking Gas Joints

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OPERATING

HEATER

FOR YOUR SAFETY READ BEFORE LIGHTING

WARNING

If you do not follow these instructions exactly, a fire 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 floor because some gas is heavier than air and will settle on

the floor.

WHAT TO DO IF YOU SMELL GAS

• Do not try to light any appliance.

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

• Immediately call your gas supplier from a neighbor’s phone. Follow the

gas supplier’s instructions.

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

C. Use only your hand to push in or turn the gas control knob. Never use tools.

If the knob will not push in or turn by hand, 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.

D. Do not use this appliance if any part has been under water. Immediately call

a qualified service technician to inspect the appliance and to replace any part

of the control system and any gas control which has been under water.

LIGHTING INSTRUCTIONS

1. STOP! Read the safety information above.

2. Make sure manual shutoff valve is fully open.

3. Turn control knob clockwise

to the OFF position.

Clockwise

Control Knob

Ignitor Button

P I L O T

O F F

H I

IGNITOR

Figure 16 - Control Knob In The OFF Position

Continued

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4. Wait five (5) minutes to clear out any gas. Then smell for gas, including near

the floor. If you smell gas, STOP! Follow “B” in the safety information at the

top of page 17. If you don’t smell gas, go to the next step.

OPERATING

HEATER

C-clockwise

5. Turn control knob counterclockwise

to the PILOT position. Press in

control knob for five (5) seconds (see Figure 16).

Note: You may be running this heater for the first time after hooking up to

gas supply. If so, the control knob may need to be pressed in for 30 seconds.

This will allow air to bleed from the gas system.

• If control knob does not pop up when released, contact a qualified

service person or gas supplier for repairs.

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.

Note: If pilot does not stay lit, refer to Troubleshooting, pages 22 through

25. 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 19.

7. Keep control knob pressed in for 30 seconds after lighting pilot. After 30

seconds, release control knob.

Ignitor Electrode

Thermocouple

Pilot Burner

Figure 17 - Pilot

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.

C-clockwise

8. Turn control knob counterclockwise

to desired heating level. The

main burner should light. Set control knob to any heat level between HI and

LO.

CAUTION

Do not try to adjust heating levels by using the manual shutoff valve.

103873

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OPERATING

HEATER

TO TURN OFF GAS TO APPLIANCE

Shutting Off Heater

1. Turn control knob clockwise

to the OFF position.

Clockwise

2. Turn off all electric power to the appliance if service is to be performed.

Shutting Off Burner Only (pilot stays lit)

1. Turn control knob clockwise

to the PILOT position.

Clockwise

THERMOSTAT CONTROL OPERATION

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 temperature. 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.

Note: The thermostat sensing bulb measures the temperature of air near the

heater cabinet. This may not always agree with room temperature (depending on

housing construction, installation location, room size, open air temperatures,

etc.). Frequent use of your heater will let you determine your own comfort levels.

MANUAL LIGHTING PROCEDURE

1. Remove front panel (see Figure 7, page 11).

2. Follow steps 1 through 5 under Lighting Instructions, pages 17 and 18.

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.

5. Replace front panel.

103873

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Check pilot flame pattern and burner flame pattern often.

INSPECTING

BURNER

PILOT FLAME PATTERN

Figure 18 shows a correct pilot flame pattern. 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.

Pilot Burner

Thermocouple

Figure 18 - Correct Pilot Flame Pattern

Thermocouple

Pilot Burner

Figure 19 - Incorrect Pilot Flame Pattern

If pilot flame pattern is incorrect, as shown in Figure 19.

• turn heater off (see To Turn Off Gas to Appliance, page 19).

• see Troubleshooting, pages 22 through 25.

103873

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BURNER FLAME PATTERN

INSPECTING

BURNER

Continued

Figure 20 shows a correct burner flame pattern. Figure 21 shows an incorrect burner

flame pattern. The incorrect burner flame pattern shows yellow tipping of the flame. It

also shows the flame higher than 1/2 the glass panel height.

WARNING

If yellow tipping occurs, your heater could produce increased levels

of carbon monoxide. If burner flame pattern shows yellow tipping,

follow instructions at bottom of this page.

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.

1/2 GLASS HEIGHT

CORRECT FLAME PATTERN

AT HIGH POSITION

Figure 20 - Correct Burner Flame Pattern

Yellow

Tipping

1/2 GLASS HEIGHT

INCORRECT FLAME PATTERN

AT HIGH POSITION

Figure 21 - Incorrect Burner Flame Pattern

If burner flame pattern is incorrect, as shown in Figure 21

• turn heater off (see To Turn Off Gas to Appliance, page 19)

• see Troubleshooting, pages 22 through 25

103873

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CLEANING

AND

WARNING

Turn off heater and let cool before cleaning.

MAINTENANCE

CAUTION

You must keep control areas, burner, and circulating air passage-

ways of heater clean. Inspect these areas of heater before each use.

Have heater inspected yearly by a qualified service person. Heater

may need more frequent cleaning due to excessive lint from carpet-

ing, bedding material, etc.

ODS/PILOT AND BURNER

• Use a vacuum cleaner, pressurized air, or small, soft bristled brush to clean.

CABINET

Air Passageways

• Use a vacuum cleaner or pressurized air to clean.

Exterior

• Use a soft cloth dampened with a mild soap and water mixture. Wipe the cabinet

to remove dust.

TROUBLE-

SHOOTING

Note: All troubleshoot-

ing items are listed in

order of operation.

WARNING

Turn off and unplug heater and let cool before servicing. Only a

qualified 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.

OBSERVED

PROBLEM

POSSIBLE

CAUSE

REMEDY

When ignitor button

is pressed, there is no

spark at ODS/pilot

1. Ignitor electrode posi-

tioned wrong

2. Ignitor electrode broken

1. Replace ignitor

2. Replace ignitor

3. Ignitor electrode not con- 3. Reconnect ignitor cable

nected to ignitor cable

4. Ignitor cable pinched or

wet

4. Free ignitor cable if

pinched by any metal or

tubing. Keep ignitor cable

dry

5. Piezo ignitor nut is loose 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

103873

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OBSERVED

PROBLEM

POSSIBLE

CAUSE

TROUBLE-

REMEDY

SHOOTING

When ignitor button

is pressed, there is

spark at ODS/pilot

but no ignition

1. Gas supply turned off

or manual shutoff

valve closed

2. Control knob not in

PILOT position

1. Turn on gas supply or

open manual shutoff

valve

2. Turn control knob to

PILOT position

Continued

3. Control knob not

pressed in while in

PILOT position

3. Press in control knob

while in PILOT position

4. Air in gas lines when

installed

4. Continue holding down

control knob. Repeat

igniting operation until

air is removed

5. ODS/pilot is clogged

5. Clean ODS/pilot (see

Cleaning and Mainte-

nance, page 22) or

replace ODS/pilot

assembly

6. Gas regulator setting is

not correct

6. Replace gas regulator

ODS/pilot lights but

flame goes out when

control knob is

released

1. Control knob not fully

pressed in

2. Control knob not

pressed in long enough

1. Press in control knob

fully

2. After ODS/pilot lights,

keep control knob

pressed in 30 seconds

3. Wait one (1) minute for

safety interlock system to

reset. Repeat ignition

operation

3. Safety interlock

system has been

triggered (Thermostat

models only)

4. Manual shutoff valve

not fully open

4. Fully open manual shut-

off valve

5. Thermocouple connec-

tion loose at control

valve

5. Hand tighten until snug,

then tighten 1/4 turn more

6. Pilot flame not touch-

ing thermocouple,

which allows thermo-

couple to cool, causing

pilot flame to go out.

This problem could be

caused by one or both

of the following:

6. A) Contact local natural

gas company

B) Clean ODS/pilot (see

Cleaning and Mainte-

nance, page 22) or

replace ODS/pilot

assembly

A) Low gas pressure

B) Dirty or partially

clogged ODS/pilot

7. Thermocouple dam-

aged

7. Replace thermocouple

8. Replace control valve

8. Control valve damaged

Continued

103873

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OBSERVED

PROBLEM

POSSIBLE

CAUSE

TROUBLE-

REMEDY

SHOOTING

Burner does not light

after ODS/pilot is lit

1. Burner orifice is

clogged

1. Clean burner (see Clean-

ing and Maintenance,

page 22) or replace burner

orifice

Continued

2. Burner orifice diameter 2. Replace burner orifice

is too small

3. Inlet gas pressure is

too low

3. Contact local natural gas

company

Delayed ignition of

burner

1. Manifold pressure is

too low

1. Contact local natural gas

company

2. Burner orifice is

clogged

2. Clean burner (see Clean-

ing and Maintenance,

page 22) or replace burner

orifice

Burner backfiring

during combustion

1. Burner orifice is

clogged or damaged

1. Clean burner (see Clean-

ing and Maintenance,

page 22) or replace burner

orifice

2. Burner damaged

2. Replace burner

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 22)

2. Replace gas regulator

2. Gas regulator defective

Slight smoke or odor

during initial opera-

tion

1. Residues from manu-

facturing processes

1. Problem will stop after a

few hours of operation

Heater produces a

whistling noise when

burner is lit

1. Turning control knob

to HI position when

burner is cold

1. Turn control knob to LO

position and let warm up

for a minute

2. Air in gas line

2. Operate burner until air is

removed from line. Have

gas line checked by local

natural gas company

3. Observe minimum installa-

tion clearances (see Figure

4, page 10)

3. Air passageways on

heater blocked

4. Clean burner (see Clean-

ing and Maintenance,

page 22) or replace burner

orifice

4. Dirty or partially

clogged burner orifice

103873

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TROUBLE-

WARNING

If you smell gas

• Shut off gas supply.

SHOOTING

Continued

• 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.

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

1. This is common with

most heaters. If noise is

excessive, contact quali-

fied service person

Heater produces a

clicking/ticking noise

just after burner is lit

or shut off

1. Metal expanding while

heating or contracting

while cooling

1. Ventilate room. Stop

using odor causing

products while heater is

running

Heater produces

unwanted odors

1. Heater burning vapors

from paint, hair spray,

glues, etc. See IMPOR-

TANT statement

above).

2. Locate and correct all

leaks (see Checking Gas

Csonnections, page 15)

2. Gas leak. See Warn-

ing statement at top

of page

1. Open window and/or door

for ventilation

1. Not enough fresh air is

available

Heater shuts off in

use (ODS operates)

2. Contact local propane/LP

gas company

2. Low line pressure

3. Clean ODS/pilot (see

Cleaning and Mainte-

nance, page 22)

3. ODS/pilot is partially

clogged

1. Locate and correct all

leaks (see Checking Gas

Connections, page 15)

2. Replace control valve

1. Gas leak. See Warn-

ing statement at top

of page

Gas odor even when

control knob is in

OFF position

2. Control valve defective

1. Take apart gas tubing and

remove foreign matter

1. Foreign matter be-

tween control valve

and burner

Gas odor during

combustion

2. Locate and correct all

leaks (see Checking Gas

Connections, page 15)

2. Gas leak. See Warn-

ing statement at top

of page

1. Refer to Air for Combus-

tion and Ventilation

Moisture/condensa-

tion noticed on

windows

1. Not enough combus-

tion/ventilation air.

requirements (page 5)

103873

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You may have further questions about installation, operation, or troubleshooting.

If so, contact DESA International’s Technical Service Department at 1-800-323-5190.

TECHNICAL

SERVICE

CGN20T/CGN20TL

20,000 Btu/Hr Models 30,000 Btu/Hr Models

CGN30T/CGN30TL

SPECIFICATIONS

Btu (Variable)

Type Gas

10,000/20,000

Natural Only

Piezo

15,000/30,000

Natural Only

Piezo

Ignition

Pressure Regulator Setting

3" W.C.

Inlet Gas Pressure (in. of water)

Maximum

10.5"

Minimum

Dimensions, Inches (H x W x D)

Heater

Carton

23.5 x 18.5 x 8.0

25.8 x 21.3 x 10.1

23.5 x 25.9 x 8.0

25.8 x 28.7 x 10.1

Weight (pounds)

Heater

Shipping

When gas pressure is too low

SERVICE

HINTS

• pilot will not stay lit

• burner will have delayed ignition

• heater will not produce specified heat

When gas quality is bad

• pilot will not stay lit

• burner will produce flames and soot

• heater will backfire when lit

You may feel your gas pressure is too low or gas quality is bad. If so, contact your

local natural gas supplier.

You can purchase a service manual from the address listed on the back page of this

manual. Send a check for $5.00 payable to DESA International.

SERVICE

PUBLICATIONS

103873

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Note: Use only original replacement parts. This will protect your warranty coverage

for parts replaced under warranty.

REPLACEMENT

PARTS

Parts 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

Technical Service Department at 1-800-323-5190 for referral information.

When calling DESA International, have ready

• your name

• your address

• model number of your heater

• how heater was malfunctioning

• type of gas used (propane/LP or natural gas)

• purchase date

Usually, we will ask you to return the defective 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

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

Dayton Hardware

P.O. Box 275

North Dayton Station

Dayton, OH 45404

All States

203-248-7553

816-842-3911

Parts Department

513-258-3721

East Coast Energy

Products

833 Broadway

W. Long Branch, NJ 07764

908-870-8809

1-800-755-8809

OH 1-800-762-3426

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

1-800-362-6951

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

P.O. Box 1096

1720 Kummer Road

Franklin, KY 42134

502-586-1922

1-800-654-8534

1-800-922-0724

Parts Department

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

1-800-268-4983

1-800-354-7368

803-879-3009

1-800-845-5301

Master Service Center

1184 Wilson NW

Walker, MI 49504

616-791-4760

1-800-446-1446

103873

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103873

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

the instructions listed under Replacement Parts on page 27 of this manual.

PARTS LIST

PART NUMBER FOR

CGN20T/CGN20TL CGN30T/CGN30TL

KEY

NO.

20,000 Btu/Hr

098304-01

098742-03

098742-19

103476-01

101108-01

098533-04AA

098260-09

098532-04AA

M11084-26

098352-01CJ

098271-02

098249-01

099440-05

098514-01

098515-01

103446-01

098517-01

103845-02

099066-01

099415-07

099553-01

103255-01

103256-01

098522-10

098530-03

098530-04

097159-04

M11084-26

M11084-38

NJF-8C

30,000 Btu/Hr

098304-01

098742-04

098742-20

103476-02

101108-01

098533-05AA

098260-10

098532-05AA

M11084-26

098352-02CJ

098271-02

098249-01

099440-05

098514-01

098515-01

103447-01

098517-01

103845-04

099066-01

099415-07

099553-01

103255-01

103256-01

098522-12

098531-04

098531-05

097159-04

M11084-26

M11084-38

NJF-8C

DESCRIPTION

QTY.

Screw, #10 x 3/8"

Front Panel for CGN20T/CGN30T (Champagne)

Front Panel for CGN20TL/CGN30TL (Ivory)

Grill Guard

Removable Speed Clip

Bottom Glass Retainer

Glass Panel

Top Glass Retainer

Screw, #10 x 3/8"

Deflector Unit

12-1

12-2

Ignitor Cable

Nut, M5

ODS/Pilot Assembly

Thermocouple

Ignitor Electrode

Burner

3/16" Pilot Tubing

Injector

Mounting Bracket

Pressure Regulator

Pilot Shield

3/8" Outlet (Burner) Tubing

3/8" Inlet Tubing

Thermostat Gas Valve

Cabinet for CGN20T/CGN30T (Woodgrain)

Cabinet for CGN20TL/CGN30TL (Ivory)

Piezo Ignitor

Screw, #10 x 3/8"

Screw, #8 x 3/8"

Hex Nut

PARTS AVAILABLE — NOT SHOWN

098305-01

100642-01

098305-01

100642-01

Control Position Label

Hardware Assembly

103873

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Purchase these heater accessories from your local dealer. If they can not supply these

accessories, either contact your nearest Parts Central (see page 27) or call DESA

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.

ACCESSORIES

FAN KITS - GA3100A and GA3200TA

For all models. Provides better heat distri-

bution. Makes heater more efficient.

Complete installation and operating instruc-

tions included.

Manually controlled - GA3100A. Includes

ON/OFF switch.

Thermostatically controlled - GA3200TA.

Includes three settings: ON/OFF/AUTO.

FLOOR MOUNTING STAND

20,000 Btu/Hr Models

CGN20TL - GA4500L - Ivory

CGN20T - GA4500 - Champagne

30,000 Btu/Hr Models

CGN30TL - GA4510L - Ivory

CGN30T - GA4510 - Champagne

For locating heater on the floor, away

from a wall. Complete installation

instructions included.

MANUAL SHUTOFF

VALVE - GA5010

For all models. Manual shutoff valve

with 1/8" NPT tap.

103873

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___________________________________________________________________

NOTES

103873

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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:

2701 Industrial Drive

P.O. Box 90004

Bowling Green, KY 42102-9004

103873-01

REV. A

02/97

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