Desa CFS24NVC, VS30N User Manual

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DESA INTERNATIONAL

UNVENTED (VENT-FREE)

NATURAL GAS LOG HEATER

Variable Manually-Controlled Models Also Design-Certified As Vented

Decorative Appliances

OWNER’S OPERATION AND INSTALLATION MANUAL

18", 24", and 30"

(“C” Models) Variable

Manually-Controlled,

and (“B” Models)

Thermostatically-

Controlled

PILOT OFF HI

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.

WARNING: Improper installation, adjustment, alteration, service, or maintenance can cause injury or property damage. Refer to this manual for correct installation and operational proce-

— Do not store or use gasoline or other

flammable vapors and liquids in the vicinity of this or any other appliance.

dures. For assistance or additional information consult a qualified installer, service agency, or the gas supplier.

— WHAT TO DO IF YOU SMELL GAS

• Do not try to light any appliance.

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

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

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

— Installation and service must be per-

formed by a qualified installer, service agency, or the gas supplier.

WARNING: This appliance is for installation only in a solid-fuel burning masonry or UL127 factory-built fireplace, or in an approved ventless firebox. It is design-certified for these installations in accordance with ANS Z21.11.2. Exception: Do not install this appliance in a factory-built fireplace that includes instructions stating it has not been tested or should not be used with unvented gas logs.

WARNING: This is an unvented gas-fired heater. It uses air (oxygen) from the room in which it is installed. Provisions for adequate combustion and ventilation air must be provided. Refer to

Air for Combustion and Ventilation

section on page 4 of this manual.

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

Save this manual for future reference.

DESA INTERNATIONAL UNVENTED NATURAL GAS LOG HEATER

SAFETY INFORMATION

WARNINGS

IMPORTANT: Read this owner’s manual carefully and completely before trying to assemble, operate, or service this heater. Improper use of this heater can cause serious injury or death from burns, fire, explosion, electrical shock, and carbon monoxide poisoning.

DANGER: Carbon monoxide

poisoning may lead to death!

Carbon Monoxide Poisoning: Early

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

Natural Gas: Natural gas is odorless. An odor-making agent is added to the gas. The odor helps you detect a gas leak. However, the odor added to the gas can fade. Gas may be present even though no odor exists.

Make certain you read and understand all Warnings. Keep this manual for reference. It is your guide to safe and proper operation of this heater.

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

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, unless installed as a vented appliance. See Installing

Damper Clamp Accessory for Vented Operation, page 10 (V ariable Manually-

Controlled models only).

4. Never install the heater

• in a recreational vehicle

• where curtains, furniture, clothing, or

other flammable objects are less than 42 inches from the front, top, or sides of the heater

• in high traffic areas

• in windy or drafty areas

5. Before installing in a solid fuel burning fireplace, the chimney flue and firebox must be cleaned of soot, creosote, ashes and loose paint by a qualified chimney cleaner. Creosote will ignite if highly heated. Inspect chimney flue for damage. If damaged, operate heater with flue damper closed.

6. If fireplace has glass doors, never operate this heater with glass doors closed. If you operate heater with doors closed, heat buildup inside fireplace will cause glass to burst. Also if fireplace opening has vents at the bottom, you must open the vents before operating heater.

7. Y ou must operate this heater with a fireplace screen in place. Make sure fireplace screen is closed before running heater.

8. This log heater is designed to be smokeless. If logs ever appear to smoke, turn off heater and call a qualified service person. slight smoking may occur due to log curing and heater burning manufacturing residues.

9. T o prevent the creation of soot, follow the instructions in Cleaning and Main- tenance, page 18.

Note:

During initial operation,

10. Do not allow fans to blow directly into the fireplace. Avoid any drafts that alter burner flame patterns. Ceiling fans may create drafts that alter burner flame patterns. Altered burner patterns can cause sooting.

11. Before using furniture polish, wax, carpet cleaners, or similar products, turn heater off. If heated, the vapors from these products may create a white powder residue within burner box or on adjacent walls or furniture.

12. Do not use a blower insert, heat exchanger insert or other accessory not approved for use with this heater.

13. 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 4 through 6. If heater keeps shutting off, see Trouble- shooting, pages 19 through 21.

14. Do not run heater

• where flammable liquids or vapors

are used or stored

• under dusty conditions

15. Do not use this heater to cook food or burn paper or other objects.

16. Never place any objects on the heater.

17. Heater base assembly 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.

18. Carefully supervise young children when they are in the room with heater.

19. Do not use heater if any part has been exposed to or 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.

20. Do not operate heater if any log is broken. Do not operate heater if a log is chipped (dime-sized or larger).

21. T urn heater of f and let cool before servicing. Only a qualified service person should service and repair heater.

22. Operating heater above elevations of 4,500 feet may cause pilot outage.

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OWNER’S MANUAL

PRODUCT IDENTIFICATION

Front Branch

Piezo Ignitor

Front Burner

Control Knob

Figure 1 - Split Oak Design Model

LOCAL CODES

Crossover Log

Base Assembly

UNPACKING

Rear Log

Rear Burner

Middle Log

PRODUCT FEATURES

OPERATION

This heater is clean burning. It requires no outside venting. There is no heat loss out a vent or up a chimney. Heat is generated by both realistic flames and glowing coals. This heater is designed for vent-free operation with flue damper closed. It has been tested and approved to ANS Z21.11.2 standard for unvented heaters. State and local codes in some areas prohibit the use of ventfree heaters. This heater may also be operated as a vented decorative (ANS Z21.60) product by opening the flue damper (nonthermostat models only).

SAFETY DEVICE

This heater has a pilot with an Oxygen Detection Safety Pilot 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.

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 ANS Z223.1, also known as NFPA 54*.

*Available from: American National Standards Institute, Inc.

1430 Broadway

New York, NY 10018

National Fire Protection Association, Inc.

Batterymarch Park

Quincy, MA 02269

Note:

Where listed vented decorative logs are required, thermostat models are not permitted.

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CAUTION: Do not remove the metal data plates from the grate assembly. The data plates contain important product information.

1. Remove logs and heater base assembly from carton. heater base assembly by burners. This could damage heater. Always handle base assembly by grate.

2. Remove all protective packaging applied to logs and heater for shipment.

3. Check all items for any shipping damage. If damaged, promptly inform dealer where you bought heater.

Note:

Do not pick up

DESA INTERNATIONAL UNVENTED NATURAL GAS LOG HEATER

AIR FOR COMBUSTION AND VENTILATION

WARNING: This heater shall not be installed in a confined space or unusually tight construction 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.

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 fuelburning appliances.

PROVIDING ADEQUATE VENTILATION

The following are excerpts from National Fuel Gas Code. NFPA 54/ANS 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 Construction

2. Unconfined Space

3. Confined Space

The information on pages 4 through 6 will help you classify your space and provide adequate ventilation.

Unusually Tight Construction

The air that leaks around doors and windows may provide enough fresh air for combustion and ventilation. However, in buildings of unusually tight construction, you must provide additional fresh air.

Unusually tight construction is defined as construction where:

a. walls and ceilings exposed to the

outside atmosphere have a continuous water vapor retarder with a rating of one perm (6 x 10 per pa-sec-m2) or less with openings gasketed or sealed

b. weather stripping has been

added on openable windows and doors

c. caulking or sealants are applied

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

If your home meets all of the three criteria above, you must provide additional fresh air. See

From Outdoors

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

mining Fresh-Air Flow For Heater Location

and

Ventilation Air

, page 6 .

, page 5.

-11

and

Deter-

Confined and Unconfined Space

The National Fuel Gas Code (ANS Z223.1, 1992 Section 5.3) defines a confined space

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

This heater shall not be installed in a confined space or unusually tight construction unless provisions are provided for adequate combustion and ventilation air.

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

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OWNER’S MANUAL

AIR FOR COMBUSTION AND VENTILATION

Continued

DETERMINING FRESH-AIR FLOW FOR HEATER LOCATION

Determining if You Have a Confined or Unconfined Space

Use this work sheet to determine if you have a confined or unconfined space. Space: Includes the room in which you will install heater plus any adjoining rooms with doorless passageways or ventilation grills between

the rooms.

1. Determine the volume of the space (length x width x height). Length x Width x Height = __________________ cu. ft. (volume of space)

Example:

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:

3. Add the Btu/Hr of all fuel burning appliances in the space.

Vent-free heater _______________ Btu/Hr Gas water heater* _______________ Btu/Hr Gas furnace _______________ Btu/Hr Vented gas heater _______________ Btu/Hr Gas fireplace logs _______________ Btu/Hr Other gas appliances* + _______________ Btu/Hr Total = _______________ Btu/Hr

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

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:

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 adjo ining

room or add ventilation grills between rooms. See Ventilation Air From Inside Building , page 6.

B. Vent room directly to the outdoors. See Ventilation Air From Outdoors, page 6. 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.

Space size 20 ft. (length) x 16 ft. (width) x 8 ft. (ceiling height) = 2560 cu. ft. (volume of space)

2560 cu. ft. (volume of space) ÷ 50 cu. ft. = 51.2 or 51,200 (maximum Btu/Hr the space can support)

Example:

Gas water heater 40,000 Btu/Hr Vent-free heater + 33,000 Btu/Hr Total = 73,000 Btu/Hr

51,200 Btu/Hr (maximum the space can support) 73,000 Btu/Hr (actual amount of Btu/Hr used)

WARNING: If the area in which the heater may be operated is smaller than that defined as an unconfined space or if the building is of unusually tight construction, provide adequate combustion and ventilation air by one of the methods described in the

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

or applicable local codes.

Continued

DESA INTERNATIONAL UNVENTED NATURAL GAS LOG HEATER

AIR FOR COMBUSTION AND VENTILATION

Continued

VENTILATION AIR

Ventilation Air From Inside Building

This fresh air would come from an adjoining unconfined space. When ventilating to an adjoining unconfined space, you must provide two permanent openings: one within 12" of the ceiling and one within 12" of the floor on the wall connecting the two spaces (see options 1 and 2, Figure 2). You can also remove door into adjoining room (see option 3, Figure 2). Follow the National Fuel

Gas Code NFPA 54/ANS 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.

Ventilation

Grills

Into Adjoining

Room,

Option 1

Figure 2 - Ventilation Air from Inside Building

Remove Door into Adjoining

Room, Option

12"

Outlet Air

Ventilation Grills

Into Adjoining Room,

Ventilated Attic

12"

Option 2

Ventilation Air From Outdoors

Provide extra fresh air by using ventilation grills or ducts. You must provide two permanent openings: one within 12" of the ceiling and one within 12" of the floor. Connect these items directly to the outdoors or spaces open to the outdoors. These spaces include attics and crawl spaces. Follow the

National Fuel Gas Code NFPA 54/ANS Z223.1, Section 5.3, Air for Combustion and Ventilation for required size of ventilation

grills or ducts.

IMPORTANT:

inlet or outlet air into attic if attic has a thermostat-controlled power vent. Heated air entering the attic will activate the power vent.

Do not provide openings for

Outlet Air

Inlet Air

Figure 3 - Ventilation Air from Outdoors

To Attic

Crawl

Space

Ventilated

Crawl Space

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OWNER’S MANUAL

42"

16"

INSTALLATION

NOTICE: This heater is intended for use as supplemental heat. Use this heater along with your primary heating system. Do not install this heater as your primary heat source. If you have a central heating system, you may run system’s circulating blower while using heater. This will help circulate the heat throughout the house. In the event of a power outage, you can use this heater as your primary heat source.

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

NOTICE: State or local codes may only allow operation of this appliance in a vented configuration. Check your state or local codes.

WARNING: Before installing in a solid fuel burning fireplace, the chimney flue and firebox must be cleaned of soot, creosote, ashes and loose paint by a qualified chimney cleaner. Creosote will ignite if highly heated. A dirty chimney flue may create and distribute soot within the house. Inspect chimney flue for damage. If damaged, operate heater with flue damper closed.

WARNING: Seal any fresh air vents or ash clean-out doors located on floor or wall of fireplace. If not, drafting may cause pilot outage or sooting. Use a heatresistant sealant. Do not seal chimney flue damper.

WARNING: Never install the

heater

• in a bedroom or bathroom unless installed as a vented appliance, see page 10 (Variable Manually-Controlled models only)

• in a recreational vehicle

• where curtains, furniture, clothing, or other flammable objects are less than 42 inches from the front, top, or sides of the heater

• in high traffic areas

• in windy or drafty areas

CAUTION: This heater creates warm air currents. These currents move heat to wall surfaces next to heater. Installing heater next to vinyl or cloth wall coverings or operating heater where impurities (such as tobacco smoke, aromatic candles, cleaning fluids, oil or kerosene lamps, etc.) in the air exist, may discolor walls.

IMPORTANT:

ture to the air. Although this is beneficial, installing heater in rooms without enough ventilation air may cause mildew to form from too much moisture. See Air for Com- bustion and Ventilation, pages 4 through 6.

Vent-free heaters add mois-

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 AND CLEARANCES

(Vent-Free Operation Only)

WARNING: Maintain the minimum clearances. If you can, provide greater clearances from floor, ceiling, and adjoining wall.

MINIMUM FIREPLACE

CLEARANCE TO

COMBUSTIBLE MATERIALS

Log Size 18", 24", 30" Side Wall 16" Ceiling 42" Floor 5"

LOG SIZING REQUIREMENTS

Minimum Firebox Size Log Front Rear* Size Height Depth Width Width

18" 17" 14" 20" 14" 24" 17" 14" 26" 18" 30" 17" 14" 32" 22"

*Measured at 14" depth

Carefully follow the instructions below. This will ensure safe installation into a masonry, UL127-listed manufactured fireplace, or listed vent-free firebox.

Minimum Wall and Ceiling Clearances (see Figure 4)

A. Clearances from the side of the fire-

place opening to any combustible wall should not be less than 16 inches.

B. Clearances from the top of the fireplace

opening to the ceiling should not be less than 42 inches.

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Left and

Right Sides

Figure 4 - Minimum Clearance to Wall and Ceiling

Continued

DESA INTERNATIONAL UNVENTED NATURAL GAS LOG HEATER

INSTALLATION

Continued

NOTICE: Manual control heaters may be used as a vented product. If so, you must always run heater with chimney flue damper open. If running heater with damper open, noncombustible material above fireplace opening is not needed. Go to

Clamp Accessory for Vented Operation

Minimum Noncombustible Material Clearances

If Not Using Mantel

Note:

If using a mantel proceed to If Using

Mantel. If not using a mantel, follow the

information on this page. You must have noncombustible material(s)

above the fireplace opening. Noncombustible materials (such as slate, marble, tile, etc.) must be at least 1/2 inch thick. With sheet metal, you must have noncombustible material behind it. Noncombustible material must extend at least 8" up (for all models). If noncombustible material is less than 12", you must install the fireplace hood accessory (24" and 30" models only). See Figure 5 for minimum clearances.

IMPORTANT:

minimum clearances, you must operate heater with chimney flue damper open. Go to Installing Damper Clamp Accessory for Vented Operation, page 10.

Installing Damper

, page 10.

If you cannot meet these

If Using Mantel

You must have noncombustible material(s) above the fireplace opening. Noncombustible materials (such as slate, marble, tile, etc.) must be at least 1/2 inch thick. With sheet metal, you must have noncombustible material behind it. Noncombustible material must extend at least 8 inches up (for all models). If noncombustible material is less than 12", you must install the fireplace hood accessory (24" and 30" models only). Even if noncombustible material is more than 12", you may need the hood accessory to deflect heat away from your mantel shelf. See Figure 5 and Figures 6 and 7, page 9, for minimum clearances.

Noncombustible Requirements for Material Distance (A) Safe Installation

12" or more Noncombustible material OK. Between 8" and 12" 24" or 30" Models: Install fireplace hood accessory

(GA6050, GA6052, or GA6053, see page 28).

18" Model: Noncombustible material OK.

Less than 8" Noncombustible material must be extended to at

least 8". See cannot extend material, you must operate heater with flue damper open.

Heat Resistant Material

(A)

IMPORTANT: If you cannot meet these minimum clearances, you must operate heater with chimney flue damper open. Go to Installing Damper Clamp Accessory for Vented Operation, page 10.

Accessories

Between 8" and 12"

, above. If you

Figure 5 - Heat Resistant Material (Slate, Marble, Tile, etc.) Above Fireplace

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OWNER’S MANUAL

INSTALLATION

Continued

MANTEL CLEARANCES

In addition to meeting noncombustible material clearances, you must also meet required clearances between fireplace opening and mantel shelf. If you do not meet the clearances losted below, you will need a hood.

Determining Minimum Mantel Clearance

If you meet minimum clearance between mantel shelf and top of fireplace opening, a hood is not required (see Figure 6).

Determining Minimum Mantel Clearance When Using a Hood

If minimum clearances in Figure 6 are not met, you must have a hood. When using a hood there are still certain minimum mantel clearances required. Follow minimum clearances shown in Figure 7 when using hood.

NOTICE: If your installation does not meet the minimum clearances shown, you must do one of the following:

• operate the logs only with the flue damper open

• raise the mantel to an acceptable height

• remove the mantel

FLOOR CLEARANCES

A. If installing appliance on the floor level,

you must maintain the minimum distance of 14" to combustibles (see Figure 8).

B. If combustible materials are less than

14" to the fireplace, you must install appliance at least 5" above the combustible flooring (see Figure 9).

Mantel Shelf

Minimum NonCombustible Material

10" 8" 6"

(A)

12" 8"

Minimum NonCombustible Material Height

18" 14"

20"

22"

Distances to Underside of Mantel

24" 20"

Underside of Mantel Shelf

All minimum distances are in inches

Log Set

24"/30" Models 18" Model

Top of Fireplace Opening

Figure 6 - Minimum Mantel Clearances Without Using Hood

Mantel Shelf

8" Min.

12" 15" 18"

Distances to Underside of Mantel

Underside of Mantel Shelf

20"

Top of Fireplace Opening

Minimum NonCombustible Material

12" 10" 8" 6"

Hood

(GA6050, GA6052)

(GA6050, GA6052, or GA6053)

Figure 7 - Minimum Mantel Clearances When Using Hood

All minimum distances are in inches

Log Sets

18", 24", & 30" Models

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Combustible

14" Min.

Material

Noncombustible

Non-Combustible Material

Material

Figure 8 - Minimum Fireplace Clearances If Installed at Floor Level

Hearth

5" Min.

Combustible Material

Figure 9 - Minimum Fireplace Clearances Above Combustible Flooring

Continued

DESA INTERNATIONAL UNVENTED NATURAL GAS LOG HEATER

INSTALLATION

Continued

INSTALLING DAMPER CLAMP ACCESSORY FOR VENTED OPERATION

Note:

When used as a vented heater, appliance must be installed only in a solid-fuel burning fireplace with a working flue and constructed of noncombustible material.

If your heater is a manually controlled model, you may use this heater as a vented product. There are three reasons for operating your heater in the vented mode.

1. The fireplace does not meet the clear-

ance to combustibles requirements for vent-free operation.

2. State or local codes do not permit vent-

free operation.

3. You prefer vented operation. If reasons number 1 or 2 above apply to you,

you must permanently open chimney flue damper. You must install the damper clamp accessory (to order, see Accessories, page

28). This will insure vented operation (see Figure 10). The damper clamp will keep damper open. Installation instructions are included with clamp accessory.

See chart below for minimum permanent flue opening you must provide. Attach damper clamp so the minimum permanent flue opening will be maintained at all times.

Area of Various Standard

Round Flues

Diameter (ins.) Area (sq. ins.)

5" 20 sq. inches 6" 29 sq. inches 7" 39 sq. inches 8" 51 sq. inches

Chimney Minimum Permanent

Height (ft.) Flue Opening (sq. ins.)

6' to 15' 39 sq. inches

15' to 30' 29 sq. inches

Damper Clamp

Damper

Masonry Fireplace

Figure 10 - Attaching Damper Clamp

Manufactured Fireplace

INSTALLING HEATER BASE ASSEMBLY

CAUTION: Do not remove the metal data plates attached to the heater base assembly. The data plates contain important warranty information.

WARNING: You must secure this heater to fireplace floor. If not, heater will move when you adjust controls. Moving heater may cause a gas leak.

WARNING: If installing in a sunken fireplace, special care is needed. You must raise the fireplace floor to allow access to heater control panel. This will insure adequate air flow and guard against sooting. Raise fireplace floor with noncombustible material. Make sure material is secure.

CAUTION: Do not pick up heater base assembly by burners. This could damage heater. Only handle base assembly by grates.

IMPORTANT:

ers are level. If heater is not level, heater will not work properly. For thermostat models, avoid damage to thermostat bulb. Avoid nicks or sharp bends in thermostat bulb wire. Keep thermostat bulb in mounting bracket.

Make sure the heater burn-

Damper

Damper Clamp

Damper

Installation Items Needed

• hardware package (provided with heater)

• approved flexible gas hose (not provided) (if allowed by local codes)

• sealant (resistant to LP gas, not provided)

• electric drill with 3/16" masonry drill bit

1. Apply pipe joint sealant lightly to male

threads of gas fitting (not provided). Connect approved flexible gas hose to gas regulator of heater (see Figure 11, page 11).

IMPORTANT:

wrench when connecting flexible gas hose.

2. Locate mounting brackets, bolts, and

nuts in hardware package. Attach mounting brackets to heater base (see Figure 12, page 11). Attach nuts finger tight.

3. Position heater base assembly in fire-

place.

4. Mark screw locations through holes in

mounting brackets. If installing in a brick-bottom fireplace, mark screw locations in mortar joint of bricks.

5. Remove heater base from fireplace.

Remove mounting brackets from heater base.

6. Drill holes at marked locations using

3/16" drill bit.

7. Attach mounting brackets to fireplace

floor using masonry screws (in hardware package).

Hold gas regulator with

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OWNER’S MANUAL

INSTALLATION

Continued

8. Reattach heater base to mounting brackets. Tighten nuts firmly.

9. Connect to gas supply. See Connect- ing To Gas Supply.

Heater Gas Regulator

Flexible Gas Hose (if allowed by local codes)

Figure 11 - Attaching Flexible Gas Hose to Heater Gas Regulator

Masonry Screw

Mounting Bracket Screw

Figure 12 - Attaching Heater to Fireplace Floor

Mounting Bracket Nut

Mounting Bracket

CONNECTING TO GAS SUPPLY

WARNING: A qualified service person must connect heater to gas supply. Follow all local codes.

Installation Items Needed

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

• piping (check local codes)

• sealant (resistant to propane/LP gas)

• manual shutoff valve *

• test gauge connection *

• 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 28.

WARNING: Never connect heater to private (non-utility) gas wells. This gas is commonly known as wellhead gas.

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 1/2" 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, 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).

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.

We recommend that you install a sediment trap in supply line as shown in Figure 13. Locate sediment trap where it is within reach for cleaning. Install in piping system between fuel supply and heater. 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.

CAUTION: Avoid damage to regulator. Hold gas regulator with wrench when connecting it to gas piping and/or fittings.

104414

From Gas Meter (5" W.C.** to 10.5" W.C. Pressure)

Tee

Sediment

Trap

Figure 13 - Gas Connection

Joint Pipe

Nipple Cap

3" Minimum

A.G.A. Design-Certified Manual Shutoff Valve With 1/8" NPT Tap*

Approved Flexible Gas Hose (if allowed by local codes)

Gas Regulator

* Purchase the optional A.G.A. design-certified manual shutoff valve from your dealer. See Accessories, page 28.

** Minimum inlet pressure for purpose of input adjustment.

Continued

DESA INTERNATIONAL UNVENTED NATURAL GAS LOG HEATER

INSTALLATION

Continued

CHECKING GAS CONNECTIONS

WARNING: Test all gas piping and connections for leaks after installing 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.

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.

6. Reconnect heater and manual shutoff valve to gas supply. Check reconnected fittings for leaks.

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.

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.

Manual Shutoff Valve

Figure 14 - Manual Shutoff Valve

Gas Meter

Open

POSITION

OFF

POSITION

Closed

Manual Shutoff Valve

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 (thermostat-controlled models) or control valve (manually-controlled models) (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 14 through 16). Check all other internal joints for leaks.

7. Turn off heater (see To Turn Off Gas to Appliance, page 15 [thermostatcontrolled models] or page 16 [manually-controlled models]).

Thermostat Gas Valve or Control Valve Location

Figure 15 - Checking Gas Joints

104414

OWNER’S MANUAL

INSTALLATION

Continued

INSTALLING LOGS

WARNING: Failure to position the parts in accordance with these diagrams or failure to use only parts specifically approved with this heater may result in property damage or personal injury.

Each log is marked with a number. These numbers will help you identify the log when installing. It is very important to install these logs exactly as instructed. Do not modify logs. Only use logs supplied with heater.

1. Place front log (#1) on top of the grate. Make sure the notches in the bottom of the log fits over the grate prongs (see Figure 16). Push back of logs flush with metal grate bar.

2. Rest middle log (#2) behind metal posts on front burner. Make sure the grooves in the bottom of the log fit over the grate. Bring the log forward next to the metal posts. The cut-out on the middle log must be on top (see Figure 17).

3. Slide the grooves in the back of the rear log (#3) against the rear grate prongs. Make sure the peg on the log is on top (see Figure 18).

4. Place the crossover log (#4) on the back log and the middle log. Make sure the peg on the rear log is in the hole in the bottom of the crossover log. The crossover log should fit in the cutout of the middle log (see Figure 19).

Notch

Front Log (#1)

Grate Prongs

Metal Grate Bar

Figure 16 - Installing Front Log (#1)

Middle Log (#2)

Groove Metal Post

Groove

Metal Post

Figure 17 - Installing Middle Log (#2)

Grate

Groove in Back of Log

Grate Prong

Rear Burner

Figure 18 - Installing Rear Log (#3)

Cutout

Peg

Rear Log (#3)

Groove in Back of Log

Grate Prong

Crossover Log (#4)

Hole

Peg

104414

Figure 19 - Installing Crossover Log (#4)

DESA INTERNATIONAL UNVENTED NATURAL GAS LOG HEATER

OPERATING HEATER

Thermostat-Controlled Models

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 y our 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. Ne ver 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

WARNING:

• If fireplace has glass doors, never operate this heater with glass doors closed. If you operate heater with doors closed, heat buildup inside fireplace will cause glass to burst. Also if fireplace opening has vents at the bottom, you must open the vents before operating heater.

• You must operate this heater with a fireplace screen in place. Make sure fireplace screen is closed before running heater.

NOTICE: During initial operation of new heater, burning logs will give off a paper-burning smell. Orange flame will also be present. Open damper or window to vent smell. This will only last a few hours.

Note:

Home owners generally prefer to operate their heater with the chimney damper closed. This will put all the heat into the room. However, there may be times you will desire the full flames of the Hi heat setting but will find the heat output excessive. You can open the chimney damper (if you have one) fully or partially to release some of the heat.

WARNING: Damper handle will be hot if heater has been running.

1. STOP! Read the safety information above.

2. Make sure manual shutoff valve is fully open.

3. Tur n control knob clockwise to the OFF position.

Clockwise

4. Wait f ive (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 above. If you don’t smell gas, go to the next step.

5. T urn contr ol knob counterclockwise

to the PILOT position.

C-clockwise

Press in control knob for f ive (5) seconds (see Figure 20).

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 or less. This will allo w air to bleed from the gas system.

6. With control knob pressed in, press and release ignitor button. This will light pilot. The pilot is attached to the front burner. If needed, keep pressing ignitor button until pilot lights.

Note:

If pilot does not stay lit, con-

tact a qualified service person or gas supplier for repairs. Until repair s are made, light pilot with match. T o light pilot with match, see Manual Light- ing Procedure on page 15.

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

• If control knob does not pop out

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. W ait one (1) minute for system to reset before lighting pilot again.

8. T urn contr ol knob counterclockwise

C-clockwise

to desired heating level. The burners should light. Set control knob to any heat level between HI and LO.

Thermocouple

Ignitor Electrode

Pilot Burner

Control KnobIgnitor Button

Figure 20 - Control Knob and Ignitor Button Location

Figure 21 - Pilot

104414

OWNER’S MANUAL

OPERATING HEATER

Continued

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

TO TURN OFF GAS

TO APPLIANCE

Shutting Off Heater

Turn control knob clockwise the OFF position.

Shutting Off Burners Only (pilot stays lit)

Turn control knob clockwise the PILOT position.

THERMOSTAT

CONTROL

OPERATION

The thermostat control knob can be set to any comfort level between Hi and Lo. The thermostat will gradually modulate the heat output and flame height from higher to lower settings, or pilot, in order to maintain the comfort level you select. The ideal comfort setting will vary by household depending upon the amount of space to be heated, the output of the central heating system, etc.

Note:

Selecting the Hi setting with the control knob will cause the burners to remain fully on, without modulating down in most cases.

MANUAL LIGHTING

PROCEDURE

1. Follow steps 1 through 5 under Light-

ing Instructions, page 14.

2. Depress control knob and light pilot

with match.

3. Keep control knob pressed in for 30

seconds after lighting pilot. After 30 seconds, release control knob. Now follow step 8, page 14.

Clockwise

Manually-Controlled Models

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 y our 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

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

WARNING:

• You must operate this heater with a fireplace screen in place. Make sure fireplace screen is closed before running heater.

Note:

Home owners generally prefer to operate their heater with the chimney damper closed. This will put all the heat into the room. However, there may be times you will desire the full flames of the High heat setting but will find the heat output excessive. You can open the chimney damper (if you have one) fully or partially to release some of the heat.

WARNING: Damper handle will be hot if heater has been running.

1. STOP! Read the safety information above.

2. Make sure manual shutoff valve is fully open.

3. Press in and turn control knob clockwise

Ignitor Button

Figure 22 - Control Knob and Ignitor Button Location

to the OFF position.

Clockwise

Control Knob

Continued

104414

DESA INTERNATIONAL UNVENTED NATURAL GAS LOG HEATER

OPERATING HEATER

Continued

4. Wait f ive (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 page 15, column 2. If you don’t smell gas, go to the next step.

5. Press in control knob and turn counterclockwise sition. Keep control knob pressed in f or five (5) seconds (see Figur e 22, page 15).

Note:

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, press and release ignitor button. This will light pilot. The pilot is attached to the front burner. If needed, keep pressing ignitor button until pilot lights.

Note:

If pilot does not light, contact a qualified service person or gas supplier for repairs. Until repairs are made, light pilot with match. T o light pilot with match, see Manual Light- ing Procedure.

Clockwise

to the PILOT po-

You may be running this

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

• If control knob does not pop out

when released, contact a qualified service person or gas supplier for repairs.

Note:

If pilot goes out, repeat steps

3 through 7.

8. Push in and turn control knob counterclockwise to the HIGH position. Both burners should light. Set control knob to desired setting.

Ignitor Electrode

Thermocouple

Figure 23 - Pilot

Pilot Burner

VARIABLE CONTROL

OPERATION

The variable control valve can be set to any heat setting and flame height desired, by simply turning the control knob until that setting is attained. Even the lowest setting provides realistic flames and glowing embers from two burners. Selecting higher settings produces greater heat output. This results in increased heating comfort.

TO TURN OFF GAS

TO APPLIANCE

Shutting Off Heater

1. Press in and turn control knob clockwise

2. Turn the control knob clockwise

3. Press in control knob and turn clockwise

Clockwise

to the HIGH position.

Clockwise

to the PILOT position.

Clockwise

to the OFF Position.

Shutting Off Burners Only (pilot stays lit)

1. Turn the control knob clockwise

Clockwise

to the HIGH position.

2. Press in and turn control knob clockwise

Clockwise

to the pilot position.

MANUAL LIGHTING

PROCEDURE

1. Follow steps 1 through 5 under Lighting Instructions, pages 15 and 16.

2. Depress control knob and light pilot with match.

3. Keep control knob pressed in for 30 seconds after lighting pilot. After 30 seconds, release control knob. Now follow step 8, column 2.

WARNING: Do not operate heater between locked positions.

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

104414

OWNER’S MANUAL

INSPECTING BURNERS

Check pilot flame pattern and burner flame patterns often.

PILOT FLAME PATTERN

Figure 24 shows a correct pilot flame pattern. Figure 25 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.

If pilot flame pattern is incorrect, as shown in Figure 25

• turn heater off (see To Turn Off Gas to Appliance, page 15 [thermostat-controlled models] or page 16 [manuallycontrolled models])

• see Troubleshooting, pages 19 through 21

Thermocouple

Pilot Burner

FRONT BURNER FLAME PATTERN

Figure 26 shows correct front burner flame pattern. Figure 27 shows incorrect front burner flame pattern. The incorrect burner flame pattern shows yellow tipping at top of blue flame.

WARNING: If yellow tipping occurs, your heater could produce increased levels of carbon monoxide. If front burner flame pattern shows yellow tipping, follow instructions at bottom of this page. Yellow flame on rear burner is normal.

NOTICE: Do not mistake orange flames with yellow tipping. Dirt or other fine particles are burned by heater, causing brief patches of orange flame.

If front burner flame pattern is incorrect, as shown in Figure 27

• turn heater off (see To Turn Off Gas to Appliance, page 15 [thermostat-controlled models] or page 16 [manuallycontrolled models])

• see Troubleshooting, pages 19 through 21

Figure 26 - Correct Front Burner Flame Pattern

Yellow Tipping At Top of Blue Flame

Figure 24 - Correct Pilot Flame Pattern

Thermocouple

Figure 25 - Incorrect Pilot Flame Pattern

Pilot Burner

Figure 27 - Incorrect Front Burner Flame Pattern

104414

DESA INTERNATIONAL UNVENTED NATURAL GAS LOG HEATER

CLEANING AND MAINTENANCE

WARNING: Turn off heater

and let cool before cleaning.

CAUTION: You must keep control areas, burners, 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, pet hair, bedding material, etc.

CLEANING BURNER INJECTOR HOLDER AND PILOT AIR INLET HOLE

The primary air inlet holes allow the proper amount of air to mix with the gas. This provides a clean burning flame. Keep these holes clear of dust, dirt, and lint. Clean these air inlet holes prior to each heating season. Blocked air holes will create soot. We recommend that you clean the unit every 2,500 hours of operation or every three months.

We also recommend that you keep the burner tube and pilot assembly clean and free of dust and dirt. To clean these parts we recommend using compressed air no greater than 30 PSI. Your local computer store, hardware store, or home center may carry compressed air in a can. You can use a vacuum cleaner in the blow position. If using compressed air in a can, please follow the directions on the can. If you don't follow directions on the can, you could damage the pilot assembly.

1. Shut off the unit, including the pilot. Allow the unit to cool for at least thirty minutes.

2. Inspect burner, pilot, and primary air inlet holes on injector holder for dust and dirt (see Figure 28).

3. Blow air through the ports/slots and holes in the burner.

4. Check the injector holder located at the end of the burner tube again. Remove any large particles of dust, dirt, lint, or pet hairs with a soft cloth or vacuum cleaner nozzle.

5. Blow air into the primary air holes on the injector holder.

6. In case any large clumps of dust have now been pushed into the burner repeat steps 3 and 4.

Clean the pilot assembly also. A yellow tip on the pilot flame indicates dust and dirt in the pilot assembly. There is a small pilot air inlet hole about two inches from where the pilot flame comes out of the pilot assembly (see Figure 29). With the unit off, lightly blow air through the air inlet hole. You may blow through a drinking straw if compressed air is not available.

Injector Holder

Ports/Slots

Burner Tube

Primary Air Inlet Holes

Figure 28 - Injector Holder On Outlet Burner Tube

Pilot Air Inlet Hole

Pilot Assembly

Figure 29 - Pilot Inlet Air Hole

LOGS

• If you remove logs for cleaning, refer to Installing Logs, page 13, to properly replace logs.

• Replace log(s) if broken or chipped (dime-sized or larger).

104414

OWNER’S MANUAL

TROUBLESHOOTING

Note:

For additional help, visit DESA

International’s Technical Service web site at www.desatech.com.

Note:

All troubleshooting items are listed

in order of operation.

OBSERVED PROBLEM

When ignitor button is pressed, there is no spark at ODS/pilot

When ignitor button is pressed, there is spark at ODS/pilot but no ignition

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

POSSIBLE CAUSE

1. Ignitor electrode not connected to ignitor cable

2. Ignitor cable pinched or wet

3. Piezo ignitor nut is loose

4. Broken ignitor cable

5. Bad piezo ignitor

6. Ignitor electrode positioned wrong

7. Ignitor electrode broken

1. Gas supply turned off or manual shutoff valve closed

2. Control knob not in PILOT position

3. Control knob not pressed in while in PILOT position

4. Air in gas lines when installed

5. ODS/pilot is clogged

6. Gas regulator setting is not correct

CAUTION: Never use a wire, needle, or similar object to clean ODS/pilot. This can damage ODS/ pilot unit.

REMEDY

1. Reconnect ignitor cable

2. Free ignitor cable if pinched by any metal or tubing. Keep ignitor cable dry

3. Tighten nut holding piezo ignitor to base panel of log set. Nut is located behind base panel

4. Replace ignitor cable

5. Replace piezo ignitor

6. Replace ignitor

7. Replace ignitor

1. Turn on gas supply or open manual shutoff valve

2. Turn control knob to PILOT position

3. Press in control knob while in PILOT position

4. Continue holding down control knob. Repeat igniting operation until air is removed

5. Clean ODS/pilot (see Cleaning and Maintenance, page 18) or replace ODS/ pilot assembly

6. Replace gas regulator

ODS/pilot lights but flame goes out when control knob is released

104414

1. Control knob not fully pressed in

2. Control knob not pressed in long enough

3. Safety interlock system has been triggered

4. Manual shutoff valve not fully open

5. Pilot flame not touching thermocouple, which allows thermocouple to cool, causing pilot flame to go out. This problem could be caused by one or both of the following: A) Low gas pressure B) Dirty or partially clogged ODS/pilot

6. Thermocouple connection loose at control valve

7. Thermocouple damaged

8. Control valve damaged

www.desatech.com

1. Press in control knob fully

2. After ODS/pilot lights, keep control knob pressed in 30 seconds

3. W ait one minute for safety interlock system to reset. Repeat ignition operation

4. Fully open manual shut-off valve

5. A) Contact local natural gas company

B) Clean ODS/pilot (see Cleaning and Maintenance, page 18) or replace ODS/ pilot assembly

6. Hand tighten until snug, then tighten 1/4 turn more

7. Replace thermocouple

8. Replace control valve

Continued

DESA INTERNATIONAL UNVENTED NATURAL GAS LOG HEATER

TROUBLESHOOTING

Continued

OBSERVED PROBLEM

One or both burners do not light after ODS/ pilot is lit

Delayed ignition of one or both burners

Burner backfiring during combustion

Yellow flame in front burner during burner combustion

Slight smoke or odor during initial operation

POSSIBLE CAUSE

1. Inlet gas pressure is too low

2. Burner orifice(s) clogged

3. Mislocated crossover tube

4. Burner orifice(s) diameter is too small

1. Manifold pressure is too low

2. Burner orifice(s) clogged

3. Mislocated crossover tube

1. Burner orifice is clogged or damaged

2. Damaged burner

3. Gas regulator defective

1. Not enough air

2. Gas regulator defective

1. Residues from manufacturing processes and logs curing

REMEDY

1. Contact local natural gas company

2. Clean burner(s) (see Cleaning and Main- tenance, page 18) or replace burner orifice(s)

3. Contact qualified service person

4. Replace burner orifice(s)

1. Contact local natural gas company

2. Clean burner(s) (see Cleaning and Main- tenance, page 18) or replace burner orifice(s)

3. Contact qualified service person

1. Clean burner (see Cleaning and Main- tenance, page 18) or replace burner orifice

2. Replace damaged burner

3. Replace gas regulator

1. Check burner(s) for dirt and debris. If found, clean burner(s) (see Cleaning and Maintenance, page 18)

2. Replace gas regulator

1. Problem will stop after a few hours of operation

Heater produces a whistling noise when burners are lit

Moisture/condensation noticed on windows

White powder residue forming within burner box or on adjacent walls or furniture

1. Turning control knob to HI position when burners are cold

2. Air in gas line

3. Air passageways on heater blocked

4. Dirty or partially clogged burner orifice(s)

1. Not enough combustion/ventilation air

1. When heated, vapors from furniture polish, wax, carpet cleaners, etc. turn into white powder residue

www.desatech.com

1. Turn control knob to LO position and let warm up for a minute

2. Operate burners until air is removed from line. Have gas line checked by local natural gas company

3. Observe minimum installation clearances (see pages 7 through 9)

4. Clean burners (see Cleaning and Main- tenance, page 18) or replace burner orifice(s)

1. Refer to Air for Combustion and Venti- lation requirements (page 4)

1. Turn heater off when using furniture polish, wax, carpet cleaners, or similar products

104414

TROUBLESHOOTING

Continued

WARNING: If you smell gas

• Shut off gas supply.

• Do not try to light any appliance.

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

• 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.

OWNER’S MANUAL

IMPORTANT:

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. These odors will disappear over time.

Operating heater where impurities in air exist may create odors. Cleaning

OBSERVED PROBLEM

Heater produces a clicking/ticking noise just after burners are lit or shut off

Heater produces unwanted odors

Heater shuts off in use (ODS operates)

Gas odor even when control knob is in OFF position

POSSIBLE CAUSE

1. Metal expanding while heating or contracting while cooling

1. Heater burning vapors from paint, hair spray, glues, cleaners, chemicals, new carpet, etc. (See ment above)

2. Gas leak. See Warning statement at

top of page

1. Not enough fresh air is available

2. Low line pressure

3. ODS/pilot is partially clogged

1. Gas leak. See Warning statement at

top of page

2. Control valve defective

IMPORTANT

state-

REMEDY

1. This is common with most heaters. If noise is excessive, contact qualified service person

1. Open window and ventilate room. Stop using odor causing products while heater is running

2. Locate and correct all leaks (see Check- ing Gas Connections, page 12)

1. Open window and/or door for ventilation

2. Contact local natural gas company

3. Clean ODS/pilot (see Cleaning and Maintenance, page 18)

1. Locate and correct all leaks (see Check- ing Gas Connections, page 12)

2. Replace control valve

Gas odor during combustion

Log set cycles to pilot, but room temperature drops to a lower than ideal level before log set comes back on

104414

1. Foreign matter between control valve and burner

2. Gas leak. See Warning statement at

top of page

1. Thermostat sensing bulb needs to be repositioned

www.desatech.com

1. Take apart gas tubing and remove foreign matter

2. Locate and correct all leaks (see Check- ing Gas Connections, page 12)

1. Reposition thermostat sensing bulb (see

Optional Positioning of Thermostat Sensing Bulb, page 22)

DESA INTERNATIONAL UNVENTED NATURAL GAS LOG HEATER

OPTIONAL POSITIONING OF THERMOSTAT SENSING BULB

FOR MASONRY AND FACTORY-BUILT METAL FIREPLACE

If your log set cycles to pilot, but the room temperature drops to a lower than ideal comfort level before the log set comes back on, you may want to reposition the thermostat sensing bulb.

The thermostat sensing bulb is located on the gas valve assembly. This location allows the thermostat to keep the room temperature at an ideal comfort level for most fireplace applications. For positioning the thermostat sensing bulb elsewhere, an adhesive-backed mounting clip is available.

Tools needed: 5/16" hex driver or socket

1. Locate the gas valve assembly and thermostat sensing bulb (see Figure 30).

2. With 5/16" hex driver or socket, loosen the thermostat screw. Carefully slide the thermostat sensing bulb out of the retaining clamp (see Figure 32).

Note:

Do not remove the screw. Make

sure you tighten the screw after removing the thermostat sensing bulb.

IMPORTANT:

the thermostat sensing bulb or capillary .

Do not force or bend

3. The thermostat sensing bulb may be located to the lower right front side of fireplace. Determine location of sensing bulb, but do not mount sensing bulb until step 5. If you have a masonry fireplace, see Figure 33 for location. If you have a factory-built metal fireplace, see Figure 34 for location. If your fireplace has glass doors, position sensing bulb directly behind door gap on right bottom side (see Figure 35).

Figure 31 - Adhesive-backed Mounting Clip

Capillary

Screw

Retaining Clamp

Figure 32 - Removing Thermostat Sensing Bulb

Thermostat Sensing Bulb

4. The mounting clip must be a minimum of 3" from bottom of fireplace to prevent crimping of capillary. Once you have decided on a location, clean the area thoroughly. Remove the paper backing from the adhesive on back of mounting clip. Press the clip into the new location so that the thermostat sensing bulb will be positioned vertically with the capillary at the bottom (see Figure 36). Slide the thermostat sensing bulb into the clip.

IMPORTANT:

Thermostat Sensing Bulb

Adhesivebacked Mounting Clip

Figure 34 - Locating Thermostat Sensing Bulb on Factory-built Metal Fireplace

Thermostat Sensing Bulb

Adhesivebacked Mounting Clip

Do not crimp capillary .

Gas Valve Assembly

Thermostat Sensing Bulb

Figure 30 - Location of Gas Valve Assembly and Thermostat Sensing Bulb

Adhesivebacked Mounting Clip

Figure 33 - Locating Thermostat Sensing Bulb on Masonry Fireplace

Glass Doors

Figure 35 - Installing Thermostat Sensing Bulb behind Glass Doors

Thermostat Sensing Bulb

Adhesivebacked

Capillary

Figure 36 - Positioning the Thermostat Sensing Bulb in the Vertical Position with the Capillary at the Bottom

Mounting Clip

Do Not Crimp Capillary

104414

OWNER’S MANUAL

SPECIFICATIONS

18" Thermostat- 24" Thermostat- 30" ThermostatControlled Controlled Controlled

Btu (Variable) 16,000/26,000 20,000/33,000 21,500/36,000 Type Gas Natural Gas Only Natural Gas Only Natural Gas Only Ignition Piezo Piezo Piezo Manifold Pressure 3.4" W.C. 3.4" W.C. 3.4" W.C. Inlet Gas

Pressure (in. of water)

Maximum 10.5" 10.5" 10.5"

Minimum* 5" 5" 5" Shipping Weight 26 lbs. 30 lbs. 34 lbs. * For purpose of input adjustment

18" Variable 24" Variable 30" Variable Manually- Manually- ManuallyControlled Controlled Controlled

Pressure (in. of water)

Maximum 10.5" 10.5" 10.5"

Minimum* 5" 5" 5" Shipping Weight 26 lbs. 30 lbs. 34 lbs. * For purpose of input adjustment

SERVICE HINTS

When Gas Pressure Is Too Low

• pilot will not stay lit

• burners will have delayed ignition

• heater will not produce specified heat

When Gas Quality Is Bad

• pilot will not stay lit

• burners 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.

TECHNICAL SERVICE

You may have further questions about installation, operation, or troubleshooting. If so, contact DESA International’s Technical Service Department at 1-800-DESA LOG (1-800-337-2564).

You can also visit DESA International’s Technical Services web site at www.desatech.com.

REPLACEMENT PARTS

Note:

Use only original replacement parts. This will protect your warranty coverage for parts replaced under warranty.

PARTS UNDER WARRANTY

Contact authorized dealers of this product. If they can’t supply original replacement part(s), call DESA International’s Technical Service Department at 1-800-323-5190.

When calling DESA International, have ready

• your name

• your address

• model and serial numbers 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 defec-

tive part to the factory.

PARTS NOT UNDER WARRANTY

Contact authorized dealers of this product. If they can’t supply original replacement part(s), 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

104414

DESA INTERNATIONAL UNVENTED NATURAL GAS LOG HEATER

ILLUSTRATED PARTS BREAKDOWN

VARIABLE MANUALLYCONTROLLED SPLIT OAK MODELS

VS18NVC CFS18NVC VS24NVC CFS24NVC VS30NVC CFS30NVC

26-1

26-2

6-2

6-1

104414

OWNER’S MANUAL

PARTS LIST

This list contains replaceable parts used in your heater. When ordering parts, follow the instructions listed under Replacement Parts on page 23 of this manual.

VARIABLE MANUALLYCONTROLLED SPLIT OAK MODELS

VS18NVC, CFS18NVC VS24NVC, CFS24NVC VS30NVC, CFS30NVC

KEY PART NUMBER FOR NO. VS18NVC/CFS18NVC VS24NVC/CFS24NVC VS30NVC/CFS30NVC DESCRIPTION QTY.

1 104388-01 104388-02 104388-03 Front Log (#1) 1 2 104390-01 104390-02 104390-03 Middle Log (#2) 1 3 104392-01 104392-02 104392-03 Rear Log (#3) 1 4 104394-01 104394-02 104394-03 Crossover Log (#4) 1 5 101006-01 101006-01 101006-01 Pilot Bracket 1 6 101330-01 101330-05 101330-06 Front Burner Assembly 1 6-1 101008-01 101008-01 101008-01 Crossover Burner Gasket 1 6-2 101007-01 101007-01 101007-01 Crossover Burner 1 7 100999-04 100999-05 100999-06 Rear Burner Assembly 1 8 101331-10 101331-08 101331-09 Base Assembly (Includes Decals) 1 9 098271-07 098271-06 098271-06 Ignitor Cable 1 10 102445-01 102445-01 102445-01 Piezo Ignitor 1 11 098867-09 098867-09 098867-09 Gas Regulator 1 12 M11084-38 M11084-38 M11084-38 Screw 2 13 101011-01 101011-02 101011-03 Inlet Tube 1 14 098354-01 098354-01 098394-01 Control Knob 1 15 098462-03 098462-03 098462-03 Control Rod 1 16 098325-01 098325-01 098325-01 Roll Pin 1 17 098508-01 098508-01 098508-01 Valve Retainer Nut 1 18 102568-01 102568-01 102568-01 Gas Valve 1 19 101005-01 101005-01 101005-01 Valve Bracket 1 20 M11084-26 M11084-26 M11084-26 Screw 4 21 101004-11 101004-11 101004-04 Rear Burner Injector 1 22 101004-11 101004-08 101004-08 Front Burner Injector 1 23 102258-01 102258-01 102258-01 Burner Tube 1 24 099387-08 099387-08 099387-08 Pilot Tube 1 25 098276-01 098276-01 098276-01 1/8” Plug 1 26 103042-01 103042-01 103042-01 O.D.S. Pilot 1 26-1 098594-01 098594-01 098594-01 Ignitor Electrode 1 26-2 098593-01 098593-01 098593-01 Thermocouple 1 27 098249-01 098249-01 098249-01 Nut 4

104414

PARTS AVAILABLE — NOT SHOWN

100563-01 100563-01 100563-01 Warning Plate 1 101055-02 101055-02 101055-02 Lighting Instructions Plate 1 100565-01 100565-01 100565-01 Warning Plate Fastener 1 100639-01 100639-01 100639-01 Caution Decal 1 101137-03 101137-03 101137-03 Hardware Kit 1 101416-38 101416-38 101416-38 Information Video 1 GA6060 GA6060 GA6060 Lava Rock 1

DESA INTERNATIONAL UNVENTED NATURAL GAS LOG HEATER

ILLUSTRATED PARTS BREAKDOWN

THERMOSTATCONTROLLED SPLIT OAK MODELS

VS18NTB VS24NTB VS30NTB

6-1

6-2

9-2

9-1

22 21

104414

OWNER’S MANUAL

PARTS LIST

THERMOSTATCONTROLLED SPLIT OAK MODELS

VS18NTB VS24NTB VS30NTB

KEY PART NUMBER FOR NO. VS18NTB VS24NTB VS30NTB DESCRIPTION QTY.

1 104388-01 104388-02 104388-03 Front Log (#1) 1 2 104390-01 104390-02 104390-03 Middle Log (#2) 1 3 104392-01 104392-02 104392-03 Rear Log (#3) 1 4 104394-01 104394-02 104394-02 Crossover Log (#4) 1 5 M11084-26 M11084-26 M11084-26 Screw 5 6 103042-01 103042-01 103042-01 O.D.S. Pilot 1 6-1 098594-01 098594-01 098594-01 Ignitor 1 6-2 098593-01 098593-01 098593-01 Thermocouple 1 7 098249-01 098249-01 098249-01 Nut 4 8 101006-01 101006-01 101006-01 Pilot Bracket 1 9 101330-01 101330-05 101330-06 Front Burner Assembly 1 9-1 101008-01 101008-01 101008-01 Gasket, Crossover Burner 1 9-2 101007-01 101007-01 101007-01 Crossover Burner 1 10 100999-04 100999-05 100999-06 Rear Burner Assembly 1 11 101331-05 101331-06 101331-07 Base Assembly (with decals) 1 12 098271-07 098271-06 098271-06 Ignitor Cable 1 13 102445-01 102445-01 102445-01 Piezo Ignitor 1 14 098867-09 098867-09 098867-09 Gas Regulator 1 15 M11084-38 M11084-38 M11084-38 Screw 2 16 102810-01 102810-02 102810-03 Inlet Tube 1 17 098354-01 098354-01 098354-01 Control Knob 1 18 098462-03 098462-03 098462-03 Control Rod 1 19 100000-01 100000-01 100000-01 Cotter Pin 1 20 101053-01 101053-01 101053-01 Adapter 1 21 099211-01 099211-01 099211-01 Screw 1 22 098544-01 098544-01 098544-01 Thermostat Clamp 1 23 101329-14 101329-16 101329-16 Thermostat Gas Valve Assy. 1 24 100994-01 100994-01 100994-01 Thermovalve Bracket 1 25 101004-11 101004-11 101004-04 Rear Burner Injector 1 26 101004-11 101004-08 101004-08 Front Burner Injector 1 27 102811-01 102811-01 102811-01 Thermostat Burner Tube 1 28 099387-09 099387-09 099387-09 Pilot Tube 1 29 102255-01 102255-01 102255-01 Strap 1 30 102764-01 102764-01 102764-01 Heat Shield 1

This list contains replaceable parts used in your heater. When ordering parts, follow the instructions listed under Replacement Parts on page 23 of this manual.

104414

PARTS AVAILABLE — NOT SHOWN

100563-01 100563-01 100563-01 Warning Plate 1 101054-01 101054-01 101054-01 Lighting Instructions Plate 1 100565-01 100565-01 100565-01 Warning Plate Fastener 1 100639-01 100639-01 100639-01 Caution Decal 1 101137-01 101137-01 101137-01 Hardware Kit 1 101416-38 101416-38 101416-38 Information Video 1 GA6060 GA6060 GA6060 Lava Rock 1 102030-01 102030-01 102030-01 Auxiliary Thermostat Mtg. Clip 1

DESA INTERNATIONAL

,,,,,,,,,,,,,,,,,

UNVENTED NATURAL GAS LOG HEATER

ACCESSORIES

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

MANUAL SHUTOFF VALVE - GA5010

For all models. Manual shutoff valve with 1/8" NPT tap. Fits 1/2" NPT pipe.

FIREPLACE HOOD

Black - GA6050 Brass - GA6052 Antique Brass - GA6053

For all models. Helps deflect heat away from mantel or wall above fireplace. Fits openings 28" to 48" wide.

VENT-FREE LOGMATE

STOVE - SVFBC

For models VL18N/P, VL18NT(A), VL18PT(A), VL18NV, VL18PV, VS18NV(B), VS18PV(B), VS18NT(A), VS18PT(A), CF18N/P, CF18NT(A), CF18PT(A), CFS18NV(B), CFS18PV(B).

VENT-FREE LOGMATE

FIREBOXES

(Not Shown)

Available in 32", 36", and 42" models. May be paired with the logs listed below. Circulating fireboxes feature louvers and an optional blower. Non-circulating, smooth face models are ideal for custom trim applications such as stone or marble.

FB32C (CIRCULATING), FB32NC (NON-CIRCULATING) SERIES

(Not Shown)

For 18" and 24" models.

FB36CA, FB42C SERIES (CIRCULATING), FB36NCA, FB42NC SERIES (NON-CIRCULATING)

(Not Shown)

For all 18", 24", and 30" models.

DAMPER CLAMP - GA6080

(Not Shown)

For manually-controlled models only. Permanently opens chimney flue damper for vented operation.

LAVA ROCK - GA6060

(Not Shown)

For all models. Order when additional rock is desired. (3 lb. bag)

104414

OWNER’S MANUAL

NOTES

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104414

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

VENT-FREE NATURAL GAS LOG HEATERS

DESA International warrants this product to be free from defects in materials and components for four (4) years and five (5) years on stainless steel burners 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 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 FOUR (4) YEARS ON ALL COMPONENTS AND FIVE (5) YEARS ON STAINLESS STEEL BURNERS 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:

INTERNATIONAL

2701 Industrial Drive P.O. Box 90004

Bowling Green, KY 42102-9004 www.desatech.com

104414 01

NOT A UPC

104414-01 Rev. E 11/99

Desa CFS24NVC, VS30N User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual