Desa Water Heater CGN10T User Manual

VENT-FREE NATURAL GAS HEATER

OWNER’S OPERATION AND INSTALLATION MANUAL

Model: CGN10T

WARNING: If the information in this manual is not followed exactly, a fire or

explosion may result causing property damage, personal injury, or loss of life.

— Do not store or use gasoline or other flammable vapors and liquids in the

vicinity of this or any other appliance.

— WHAT TO DO IF YOU SMELL GAS

• Do not try to light any appliance.

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

• Immediatelycallyourgassupplierfromaneighbor’sphone. Followthegas

supplier’s instructions.

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

SAFETY

WARNINGS Continued

WARNING ICON

001

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. Heater shall not be installed in a 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 Air for Combustion

and Ventilation, pages 5 through 8.

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

This will insure enough air for proper combustion.

7. If heater shuts off, do not relight until you provide fresh, outside air. If heater

keeps shutting off, have it serviced.

8. Do not run heater

• where flammable liquids or vapors are used or stored

• under dusty conditions

9. 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 shutdown. Allow surface to cool before touching.

11. Carefully supervise young children when they are in 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 quali-

fied 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 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.

102921

Ignitor Button

PRODUCT

Control Knob

IDENTIFICATION

Grill

Guard

Glass

Panel

Heater

Cabinet

Front

Panel

Figure 1 - Vent-Free Natural Gas Heater

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 Z223.1 also

known as NFPA 54*.

LOCAL CODES

*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.

UNPACKING

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

This heater has a thermostat sensing bulb and thermostat control. This resuts in the

greatest heater comfort. This can also result in lower gas bills.

102921

AIR FOR

COMBUSTION

AND

WARNING

WARNING ICON

001

This heater shall not be installed in a confined space unless

provisions are provided for adequate combustion and ventilation

air. Read the following instructions to insure proper fresh air for

this and other fuel-burning appliances in your home.

VENTILATION

Today’s homes are built more energy efficient than ever. New materials, increased

insulation, and new construction methods help reduce heat loss in homes. Home

owners weather strip and caulk around windows and doors to keep the cold air out

and the warm air in. During heating months, home owners want their homes as

airtight as possible.

While it is good to make your home energy efficient, your home needs to breathe.

Fresh air must enter your home. All fuel-burning appliances need fresh air for

proper combustion and ventilation.

Exhaust fans, fireplaces, clothes dryers, and fuel burning appliances draw air from

the house to operate. You must provide adequate fresh air for these appliances.

This will insure proper venting of vented fuel-burning appliances.

PROVIDING ADEQUATE VENTILATION

The following 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 8 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 or less with open-

ings gasketed or sealed and

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

c. caulking or sealants are applied to areas such as joints around window

and door frames, between sole plates and floors, between wall-ceiling

joints, between wall panels, at penetrations for plumbing, electrical, and

gas lines, and at other openings.

If your home meets all of the three criteria above, you must provide addi-

tional 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.

Unconfined Space

The National Fuel Gas Code, ANSIZ223.1, 1992, Section 5.3 defines uncon-

fined space as having a minimum air volume of 50 cubic feet (127 cubic cm) for

each 1000 Btu/Hr input rating of all appliances in the space (cubic feet equals

length x width x height of space). Include adjoining rooms only if there are

doorless passageways or ventilation grills between the rooms.

Confined Space

The National Fuel Gas Code, ANSIZ223.1, 1992, Section 5.3 defines confined

space as having an air volume of less than 50 cubic feet (127 cubic cm) for each

1000 Btu/Hr input rating of all appliances in the space (cubic feet equals length

x width x height of space). Include adjoining rooms only if there are doorless

passageways or ventilation grills between the rooms.

Continued

102921

DETERMINING AIR FLOW FOR HEATER LOCATION

AIR FOR

COMBUSTION

AND

Determining if You Have a Confined or Unconfined Space

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.

VENTILATION

1. Determine the volume of the space (length x width x height).

Continued

Length x Width x Height =

___________________

cu. ft. (volume of space)

Example: Space size 18 ft. (length) x 16 ft. (width) x 8 ft. (ceiling height) =

2304 cu. ft. (volume of space)

If additional ventilation to adjoining room is supplied with grills or openings, add the

volume of these rooms to the total volume of the space.

2. 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: 2304 cu. ft. (volume of space) ÷ 50 cu. ft. = 46.1 or 46,100 (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

Other gas appliances*

Total

___________________ Btu/Hr

+ ___________________ Btu/Hr

= ___________________ Btu/Hr

Example: Gas water heater

Vent-free heater

Total

40,000

10,000

50,000

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: 46,100 Btu/Hr (maximum the space can support)

50,000 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.

102921

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 combus-

tion and ventilation air by one of the methods described in the

National Fuel Gas Code, ANSI Z223.1, 1992, Section 5.3.

VENTILATION

Continued

VENTILATION AIR

Ventilation Air From Inside Building

This fresh air would come from an adjoining unconfined space. When ventilating to

an adjoining unconfined space, you must provide two permanent openings: one within

12" of the ceiling and one within 12" of the floor on the wall connecting the two spaces

(see options 1 and 2, Figure 2). You can also remove door into adjoining room (see

option 3, Figure 2). Follow the National Fuel Gas Code NFPA 54/ANSI Z223.1,

Section 5.3, Air for Combustion and Ventilation for required size of ventilation 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

102921

Ventilation Air From Outdoors

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. 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.

VENTILATION

Continued

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.

Ventilated

Outlet

Attic

Air

Outlet

Air

To Attic

Crawl

Space

Inlet

Air

Ventilated

Inlet Air

Crawl Space

Figure 3 - Ventilation Air from Outdoors

102921

INSTALLINGTO

WALL

NOTICE

Aqualifiedservicepersonmustinstallheater. Followalllocalcodes.

CHECK GAS TYPE

Use only natural gas. If your gas supply is not natural, 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 14)

• 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 Accessory, page 28.

LOCATING HEATER

This heater is designed to be mounted on a wall.

WARNING

WARNING ICON

001

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

can, provide greater clearances from floor, ceiling, and joining wall.

WARNING

WARNING ICON

001

Never install the heater

• in 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, in-

stalling heater in rooms without enough ventilation air may cause mildew to form from

too much moisture. See Air for Combustion and Ventilation, pages 5 through 8.

CAUTION

WARNING ICON

001

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

102921

For convenience and efficiency, install heater

INSTALLINGTO

• where there is easy access for operation, inspection, and service

WALL

Continued

• in coldest part of room

CEILING

36"

Minimum

From

Sides Of

Heater

Right

Side

Left

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 is located inside the heater. Do not move this bulb

during installation or operation of the heater.

INSTALLING HEATER TO WALL

Marking Screw Locations

1. Determine where you will locate heater.

WARNING

WARNING ICON

001

Maintain minimum clearances shown in Figure 5. If you can,

provide greater clearances from floor and joining wall.

2. Mark two mounting screw locations on wall (see Figure 5).

8 7/8"

7 3/4"

Minimum To

Maintain 6"

Clearance

From Wall

Mounting

Screw

Locations

20 1/4"

Minimum To

Maintain 3"

Clearance

From Floor

FLOOR

Figure 5 - Mounting Screw Locations

102921

Installing Two Mounting Screws

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

package is provided with heater.

INSTALLINGTO

WALL

Continued

Attaching to wall stud method

For attaching mounting screw to wall stud

1. Drill hole at marked location using 9/64" drill bit.

2. Insert mounting screw into wall stud.

3. Tighten screw until 1/16" space (thickness of penny) is between screwhead and

wall.

Attaching to wall anchor method

Follow instructions below to attach mounting screws to hollow walls (wall areas

between studs) or solid walls (concrete or masonry).

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

masonry), drill at least 1 1/4" deep.

2. Fold wall anchor (see Figure 6).

Figure 6 - Folding Anchor

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

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

“pop” open anchor wings (see Figure 7). IMPORTANT: Do not hammer key!

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

Thin Walls

(1/4" to 1/2" thick)

Figure 7 - Popping Open Anchor Wings For Thin Walls

5. Tighten two screws until 1/16" space (thickness of penny) is between

screwheads and wall (see Figure 8).

Thin or Thick Wall

(thick wall shown)

1/16" Space

Solid Wall

ANCHOR

Figure 8 - Tightening Anchors

Continued

102921

Placing Heater On Mounting Screws

INSTALLINGTO

1. Locate two keyhole slots on back panel of heater (see Figure 9).

2. Place large openings of slots over screwheads. Slide heater down until screws

are in small portion of slots.

WALL

Continued

Keyhole Slots

Figure 9 - Location Of Keyhole Slots On Back Panel Of Heater

Removing Front Panel Of Heater

1. Remove two screws near bottom corners of front panel.

2. Lift straight up on grill guard until it stops. Grill guard will slide up about 1/4".

3. Pull bottom of front panel forward, then down.

Figure 10 - Removing Front Panel Of Heater

Installing Bottom Mounting Screw

1. Locate bottom mounting hole. This hole is near bottom on back panel of heater

(see Figure 11).

2. Mark screw location on wall.

3. Remove heater from wall.

4. If installing bottom mounting screw into hollow or solid wall, install wall anchor.

Follow steps 1 through 5 under Attaching To Wall Anchor Method, page 11.

If installing bottom mounting screw into wall stud, drill hole at marked location

using 9/64" drill bit.

5. Replace heater on wall.

6. Insert bottom anchor screw through back panel into bottom anchor or drilled

hole (see Figure 11).

7. Tighten screw until heater is 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 13-15).

Figure 11 - Installing Bottom Mounting Screw

102921

CONNECTING

TO GAS

NOTICE

A qualified service person must connect heater to gas supply.

Follow all local codes.

SUPPLY

WARNING

WARNING ICON

001

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

commonly known as wellhead 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

WARNING ICON

001

Use only new, black iron or steel pipe. Internally-tinned copper

tubing may be used in certain areas. Check your local codes. Use

pipe 3/8" diameter or greater to allow proper gas volume to heater.

If pipe is too small, undue loss of pressure will occur.

Installation must include a manual shutoff valve, ground joint 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 12, page 14).

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

WARNING ICON

001

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

Install sediment trap (trap) in supply line as shown in Figure 12, page 14. 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 contami-

nants. This keeps them from going into heater controls. If sediment trap is not

installed or is installed wrong, heater may not run properly.

Continued

102921

IMPORTANT: Hold pressure regulator with wrench when connecting it to gas piping

and/or fittings.

CONNECTING

TO GAS

SUPPLY

Continued

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 *

From

External

Regulator

(4" W.C. to

10.5" W.C.

Pressure)

1/8" NPT

Plug Tap

Tee

Joint

3" Minimum

Sediment Trap

Pipe

Nipple

Cap

Figure 12 - 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 Accessory, page 28.

CHECKING

GAS

CONNECTIONS

WARNING

WARNING ICON

001

Test all gas piping and connections for leaks after installing or

servicing. Correct all leaks at once.

WARNING

WARNING ICON

001

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.

102921

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.

CONNECTING

TO GAS

SUPPLY

Test Pressures Equal To or Less Than 1/2 PSIG

1. Close manual shutoff valve (see Figure 13).

Continued

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

gas valve located on or near gas meter.

3. Check all joints from gas meter to manual shutoff valve (see Figure 14). 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 13).

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 control valve (see Figure 14).

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 16 through 18). Check the rest of the

internal joints for leaks.

7. Turn off heater (see To Turn Off Gas To Appliance, page 18).

8. Replace front panel.

Open

POSITION

Manual

Shutoff

Valve

OFF

POSITION

Closed

Figure 13 - Manual Shutoff Valve

Control Valve Location

Gas Meter

Manual

Shutoff

Valve

Figure 14 - Checking Gas Joints

102921

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 15 - Control Knob In The OFF Position

102921

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 16. If you don’t smell gas, go to the next step.

OPERATING

HEATER

Continued

C-clockwise

5. Turn control knob counterclockwise

to the PILOT position. Press

in control knob for five (5) seconds (see Figure 15, page 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.

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 21 through

24. 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 18.

Ignitor Electrode

Pilot Burner

Thermocouple

Figure 16 - Pilot

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

seconds, release control knob.

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

service person or gas supplier for repairs.

Note: If pilot goes out, repeat steps 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.

Continued

102921

OPERATING

TO TURN OFF GAS TO APPLIANCE

HEATER

Continued

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 tempera-

tures, etc.). Frequent use of your heater will let you determine your own

comfort levels.

MANUAL LIGHTING PROCEDURE

1. Remove front panel (see Figure 10, page 12).

2. Follow steps 1 through 5 under Lighting Instructions, pages 16 and 17.

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.

102921

Check pilot flame pattern and burner flame pattern often.

INSPECTING

BURNER

PILOT FLAME PATTERN

Figure 17 shows a correct pilot flame pattern. Figure 18 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

GOOD PILOT

GRH/OV 009

Figure 17 - Correct Pilot Flame Pattern

Pilot Burner

Thermocouple

BAD PILOT/LP

GRH/OV 008

Figure 18 - Incorrect Pilot Flame Pattern

If pilot flame pattern is incorrect, as shown in Figure 18

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

• see Troubleshooting, pages 21 through 24

102921

BURNER FLAME PATTERN

INSPECTING

Figure 19 shows a correct burner flame pattern. Figure 20 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.

BURNER

Continued

WARNING

WARNING ICON

001

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. Dust 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 19 - Correct Burner Flame Pattern

Yellow

Tipping

1/2 GLASS HEIGHT

INCORRECT FLAME PATTERN

AT HIGH POSITION

Figure 20 - Incorrect Burner Flame Pattern

If burner flame pattern is incorrect, as shown in Figure 20

• turn heater off (see To Turn Off Gas to Appliance, page 18)

• see Troubleshooting, pages 21 through 24

102921

CLEANING

AND

WARNING

WARNING ICON

001

Turn off heater and let cool before cleaning.

MAINTENANCE

CAUTION

WARNING ICON

001

You must keep control areas, burner, and circulating air

passageways of heater clean. Inspect these areas of heater before

each use. Have heater inspected yearly by a qualified service

person. Heater may need more frequent cleaning due to excessive

lint from carpeting, bedding material, etc.

ODS/PILOT AND BURNER ORIFICE

• 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

WARNING

WARNING ICON

001

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

service person should service and repair heater.

Note: All troubleshooting

items are listed in order of

operation.

CAUTION

WARNING ICON

001

Never use a wire, needle, or similar object to clean ODS/pilot. This

can damage ODS/pilot unit.

POSSIBLE

CAUSE

OBSERVED

PROBLEM

REMEDY

1. Ignitor cable pinched or

wet

1. Free ignitor cable if

pinched by any metal or

tubing. Keep ignitor

cable dry

When ignitor button

is pressed, there is no

spark at ODS/pilot

2. Ignitor electrode not

connected to ignitor

cable

2. Reconnect ignitor cable

3. Piezo ignitor nut is loose 3. Tighten nut holding

piezo ignitor to heater

cabinet. Nut is located

inside heater cabinet at

top

4. Broken ignitor cable

5. Ignitor electrode broken

6. Bad piezo ignitor

7. Ignitor electrode posi-

tioned wrong

4. Replace ignitor cable

5. Replace ignitor

6. Replace piezo ignitor

7. Replace ignitor

102921

POSSIBLE

CAUSE

OBSERVED

PROBLEM

TROUBLE-

REMEDY

SHOOTING

1. Turn on gas supply or

open manual shutoff

valve

2. Turn control knob to

PILOT position

1. Gas supply turned off

or manual shutoff

valve closed

2. Control knob not in

PILOT position

When ignitor button

is pressed, there is

spark at ODS/pilot

but no ignition

Continued

3. Press in control knob

while in PILOT

3. Control knob not

pressed in while in

PILOT position

position

4. Continue holding down

control knob. Repeat

igniting operation until

air is removed

4. Air in gas lines when

installed

5. Clean ODS/pilot (see

Cleaning and Mainte-

nance, page 21) or

replace ODS/pilot

assembly

5. ODS/pilot is clogged

6. Replace gas regulator

6. Gas regulator setting is

not correct

1. Press in control knob

fully

1. Control knob not fully

pressed in

2. Control knob not

pressed in long enough

ODS/pilot lights but

flame goes out when

control knob is

released

2. After ODS/pilot lights,

keep control knob

pressed in 30 seconds

3. Wait one minute for

safety interlock system

to reset. Repeat

3. Safety interlock system

has been triggered

ignition operation.

4. Fully open manual

shut-off valve

4. Manual shutoff valve

not fully open

5. Hand tighten until

snug, then tighten 1/4

turn more

5. Thermocouple connec-

tion loose at control

valve

6. A) Contact local

natural gas company

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:

B) Clean ODS/pilot

(see Cleaning and

Maintenance, page 21)

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

102921

OBSERVED

PROBLEM

POSSIBLE

CAUSE

TROUBLE-

REMEDY

SHOOTING

Burner does not light

after ODS/pilot is lit

1. Burner orifice is

clogged

1. Clean burner orifice (see

Cleaning and Mainte-

nance, page 21) or

Continued

replace burner orifice

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 orifice (see

Cleaning and Mainte-

nance, page 21) or

replace burner orifice

Burner backfiring

during combustion

1. Burner orifice is

clogged or damaged

1. Clean burner orifice (see

Cleaning and Mainte-

nance, page 21) or

replace burner orifice

2. Contact local natural gas

company

2. Inlet gas pressure is

too low

3. Burner damaged

4. Gas regulator defective

3. Replace burner

4. 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 Mainte-

nance, page 21)

2. Inlet gas pressure is

too low

2. Contact local natural gas

company

3. Gas regulator defective

3. Replace gas regulator

Slight smoke or odor

during initial operation

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 checked by

local natural gas company

3. Observe minimum

installation clearances

(see Figure 4, page 10)

4. Clean burner (see

Cleaning and Mainte-

nance, page 21) or

3. Air passageways on

heater blocked

4. Dirty or partially

clogged burner orifice

replace burner orifice

Continued

102921

TROUBLE-

WARNING

WARNING ICON

001

If you smell gas

SHOOTING

• Shut off gas supply.

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

Heater produces a

clicking/ticking noise

just after burner is lit

or shut off

1. Metal expanding while

heating or contracting

while cooling

qualified service person

1. Ventilate room. Stop

using odor-causing

Heater produces

unwanted odors

1. Heater burning vapors

from paint, hair spray,

glues, etc. See IMPOR-

TANT statement above.

2. Gas leak. See Warn-

ing statement at

products while heater is

running

2. Locate and correct all

leaks (see Checking Gas

Connections, page 14)

top of page

1. Open window and/or

door for ventilation

2. Contact local natural

gas company

Heater shuts off in

use (ODS operates)

1. Not enough fresh air is

available

2. Low line pressure

3. Clean ODS/pilot (see

Cleaning and Mainte-

nance, page 21)

3. ODS/pilot is partially

clogged

1. Locate and correct all

leaks (see Checking Gas

Connections, page 14)

2. Replace control valve

Gas odor even when

control knob is in

OFF position

1. Gas leak. See Warn-

ing statement at

top of page

2. Control valve defective

1. Take apart gas tubing

and remove foreign

matter

Gas odor during

combustion

1. Foreign matter be-

tween control valve

and burner

2. Locate and correct all

leaks (see Checking Gas

Connections, page 14)

2. Gas leak. See Warn-

ing statement at

top of page

1. Refer to Air for Com-

bustion and Venti-

lation requirements

(page 5)

Moisture/condensation

noticed on windows

1. Not enough combus-

tion/ventilation air

102921

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

CGN10T

SPECIFICATIONS

Btu (Variable)

Type Gas

Ignition

5,000/10,000

Natural Only

Piezo

Pressure Regulator Setting

Inlet Gas Pressure (inches of water)

Maximum

3" W.C.

10.5"

Minimum

Dimensions, Inches (H x W x D)

Heater (Including knobs and grill) 21 1/2 x 13 1/2 x 7

Carton

Weight (pounds)

Shipping

25 1/4 x 16 3/4 x 7 1/2

When gas pressure is too low

• pilot will not stay lit

• burner will have delayed ignition

• heater will not produce specified heat

When gas quality is bad

SERVICE

HINTS

• 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.

102921

ILLUSTRATED PARTS BREAKDOWN

CGN10T

102921

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

the instructions listed under Replacement Parts on page 25 of this manual.

PARTS LIST

CGN10T

KEY PART

NO.

NUMBER

DESCRIPTION

QTY.

098304-01

099467-02

099318-04

101108-01

102018-01AA Bottom Glass Retainer

098260-03 Glass Panel

098532-03AA Top Glass Retainer

M11084-38 Screw, #8 x 3/8"

098352-03BR Deflector Unit

Screw, #10 x 3/8"

Front Panel Assembly

Grill Guard

Grill Guard Clip

098271-03

098249-01

100701-03

Ignitor Cable

Nut, M5

ODS/Pilot Assembly

Thermocouple

Ignitor Electrode

Burner

12-1 098514-01

12-2 098594-01

099386-02

099387-11

098251-03

099463-01

099415-01

102863-01

102864-01

102492-01

102493-01

098522-07

102571-01

102445-01

098275-01

099553-01

098303-02

Pilot Tubing

Injector

Injector Holder

Pressure Regulator

Burner Tubing

Regulator Tubing

5/16" Male Connector

1/4" Male Connector

Thermostat Gas Valve

Cabinet Assembly

Piezo Ignitor

3/8" NPT Male Plug

Pilot Shield

Screw, #6 x 5/16"

PARTS AVAILABLE - NOT SHOWN

102471-01

100642-02

Control Position Label

Assembly, Hardware

12-1

12-2

ODS/PILOT

102921

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

for parts replaced under warranty.

REPLACEMENT

PARTS

Parts Under Warranty

Contact authorized dealer from whom you purchased this product. If they cannot

supply original replacement part(s), call DESA International’s Technical Service

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

When contacting your dealer or DESA International, have ready:

• your name

• your address

• model number of your heater

• how heater was malfunctioning

• type of gas used (propane 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 cannot supply original replace-

ment part(s), call DESA International’s Parts Department at 1-800-972-7879 for

information.

When calling DESA International, have ready:

• model number of your heater

• the replacement part number

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

Purchase this heater accessory from your local dealer. If they cannot supply this

accessory, call DESA International’s Parts Department at 1-800-972-7879 for

information. You can also write to the address listed on the back page of this

manual.

ACCESSORY

MANUAL SHUTOFF

VALVE - GA5010

Manual shutoff valve with 1/8"

NPT tap.

102921

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

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

PARTS

CENTRAL

Baltimore Electric

1348 Dixwell Avenue

Hamden, CT 06514

1-800-397-7553

Dayton Hardware

P.O. Box 275

North Dayton Station

Dayton, OH 45404

All States

Washer Equipment Co.

1715 Main Street

Kansas City, MO 64108

KS, MO, AR

203-248-7553

816-842-3911

Parts Department

513-258-3721

Parts Department

OH 1-800-762-3426

Parts Department

Portable Heater Parts

342 N. County Rd. 400 E.

Valparaiso, IN 46383

All States

219-462-7441

1-800-362-6951

East Coast Energy

Products

707 Broadway

W. Long Branch, NJ

07764

908-870-8809

1-800-755-8809

Parts Department

Halco Enterprises

208 Carter Drive, Unit 21

West Chester, PA 19382

610-430-7717

1-800-368-0803

Parts Department

FBD

P.O. Box 1096

1720 Kummer Road

Franklin, KY 42134

502-586-1922

1-800-654-8534

LaPorte’s Parts and Service

2444 North 5th Street

Hartsville, SC 29550

803-332-0191

Tarantin Tank Co.

P.O. Box 6129

Freehold, NJ 07728

908-780-9340

1-800-922-0724

Parts Department

Four Flags Power

Products

1115 Stateline Road

Niles, MI 49120

616-684-2697

Parts Only

Cans Unlimited, Inc.

P.O. Box 645

Taylor, SC 29687

All States

803-879-3009

1-800-845-5301

Parts Department

Albany Ladder

1586-90 Central Avenue

Albany, NY 07728

NY, MA, VT

518-869-5335

1-800-354-7368

(NY, MA, VT)

Master Parts Distributor

1184 Wilson Ave. NW

Grand Rapids , MI 49504

616-791-0505

Parts Department

1-800-446-1446

Fax: 1-616-791-8270

Parts Department

102921

_________________________________________________________________

NOTES

102921

_________________________________________________________________

NOTES

102921

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 RESIDENTIAL GAS HEATERS

DESA International warrants this product to be free from defects in materials and components for one (1) year from 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

thisheatertoproperoperatingconditionandanallowanceforlaborwhenprovidedbyaDESAAuthorizedServiceCenter.

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

orbecomedamagedasaresultofmisuse,accidents,lackofpropermaintenanceordefectscausedbyimproperinstallation.

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 WARRAN-

TIES ANDLIMITSTHEDURATIONOFANYANDALLIMPLIEDWARRANTIES,INCLUDINGWARRANTIES

OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE TO ONE (1) YEAR ON ALL

COMPONENTS 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, INCIDENTAL OR

CONSEQUENTIAL DAMAGES.

Some states do not allow a limitation on how long an implied warranty lasts or an exclusion or limitation of incidental

or consequential damages, so the above limitation on implied warranties, or exclusion or limitation on damages may not

apply to you.

This warranty gives you 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

102921-01

Bowling Green, KY 42102-9004

REV. A

4/96

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