Desa FA-3B, FAS-5C, FAS-3C, FA-5B User Manual

OWNER’S MANUAL

INFRARED VENT-FREE NATURAL GAS HEATER

OWNER’S OPERATION AND INSTALLATION MANUAL

FA-3B

FAS-3C

FA-5B

FAS-5C

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.

• 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 performed by

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

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

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

4 of this manual.

section on page

This appliance may be installed in an aftermarket*, permanently located, manufactured (mobile) home, where not prohibited by local codes.

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.

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

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Save this manual for future reference.

INFRARED NATURAL GAS 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, persons 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 natural gas. The odor helps you detect a natural gas leak. However, the odor added to natural gas can fade. Natural 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.

Due to high temperatures, the appliance should be located out of traffic and away from furniture and draperies.

Do not place clothing or other flammable material on or near the appliance. Never place any objects on the heater.

Surface of heater becomes very hot when running heater. Keep children and adults away from hot surface to avoid burns or clothing ignition. Heater will remain hot for a time after shutdown. Allow surface to cool before touching.

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

Make sure grill guard is in place before running heater.

Keep the appliance area clear and free from combustible materials, gasoline, and other flammable vapors and liquids.

1. This appliance is only for use with the type of gas indicated on the rating plate. This appliance is not convertible for use with other gases.

2. If you smell gas

• Shut off gas supply.

• Do not try to light any appliance.

• Do not touch any electrical switch; do

not use any phone in your building.

• Immediately call your gas supplier

from a neighbor’s phone. Follow the gas supplier’s instructions.

• If you cannot reach your gas supplier ,

call the fire department

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

4. Always run non-thermostat heater with plaque control knob in a locked position. Never set control knob between locked positions. Poor combustion and higher levels of carbon monoxide may result.

5. This heater needs fresh, outside air ventilation to run properly. This heater has an Oxygen Depletion Sensor (ODS) safety shutoff system. The ODS shuts down the heater if not enough fresh air is available. See Fresh Air for Combus- tion and Ventilation, pages 4 through 6.

6. Keep all air openings in front and bottom of heater clear and free of debris. This will insure enough air for proper combustion.

7. If heater shuts off, do not relight until you provide fresh, outside air. If heater keeps shutting off, have it serviced.

8. Do not run heater

• where flammable liquids or vapors

are used or stored

• under dusty conditions

9. Before using furniture polish, wax, carpet cleaner, 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.

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

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

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

WARNING: Do not use any accessory not approved for use with this heater.

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OWNER’S MANUAL

PRODUCT IDENTIFICATION

Front Panel

Control Knob

Grill Guard

Burners

Heater Cabinet

PRODUCT FEATURES

SAFETY DEVICE

This heater has a pilot with an Oxygen Depletion Sensing (ODS) safety shutoff system. The ODS/pilot is a required feature for vent-free room heaters. The ODS/pilot shuts off the heater if there is not enough fresh air.

PIEZO IGNITION SYSTEM

This heater has a piezo ignitor. This system requires no matches, batteries, or other sources to light heater.

THERMOSTATIC HEAT CONTROL ON THERMOSTAT MODELS FAS-3C AND FAS-5C

These heaters have a control valve with a thermostat sensing bulb. This results in the greatest heater comfort and may result in lower gas bills.

Figure 1 - Vent-Free Natural Gas Heater (Model FA-5B Shown)

LOCAL CODES

Install and use heater with care. Follow all local codes. In the absence of local codes, use the latest edition of National Fuel Gas Code 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

UNPACKING

1. Remove heater from carton.

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

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

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INFRARED NATURAL GAS HEATER

FRESH 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.

PRODUCING 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, see

Fresh-Air Flow for Heater Location,

page 5

and

, page 6

Ventilation Air

Determining

and

-11

Confined and Unconfined Space

The National Fuel Gas Code ANS Z223.1

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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FRESH AIR FOR COMBUSTION AND VENTILATION

Continued

DETERMINING FRESH-AIR FLOW FOR HEATER LOCATION

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.

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 adjoin-

ing 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 + 18,000 Btu/Hr Total = 58,000 Btu/Hr

51,200 Btu/Hr (maximum the space can support) 58,000 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, Section 5.3

or applicable local codes.

Continued

INFRARED NATURAL GAS HEATER

FRESH 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

Ventilation

Grills

into Adjoining

Room,

Option 1

Figure 2 - Ventilation Air from Inside Building

Remove Door into Adjoining

Room,

Option 3

Into Adjoining Room,

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

Ventilated Attic

Outlet Air

Inlet Air

Figure 3 - Ventilation Air from Outdoors

To Attic

Crawl

Space

Ventilated

Crawl Space

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OWNER’S MANUAL

36"

FLOOR

CEILING

Minimum

Minimum to Top Surface of Carpeting, Tile or Other Combustible Material

8" Minimum From Sides Of Heater

Left Side

Right Side

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.

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)

• equipment shutoff valve *

• ground joint union

• test gauge connection *

• sediment trap

• tee joint

• pipe wrench * A CSA/AGA design-certified equipment

shutoff valve with 1/8" NPT tap is an acceptable alternative to test gauge connection. Purchase the optional CSA/AGA design-certified equipment shutoff valve from your dealer. See Accessories, page 19.

LOCATING HEATER

This heater is designed to be mounted on a wall.

WARNING: Maintain the mini-

mum clearances shown in Figure

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

You can locate heater on floor, away from a wall. An optional floor mounting stand is needed. Purchase the floor mounting stand from your dealer. See Accessories, page 19.

WARNING: Never install the

heater

• in a bedroom or bathroom

• in a recreational vehicle

• where curtains, furniture, clothing, or other flammable objects are less than 36 inches from the front, top, or sides of the heater

• as a fireplace insert

• in high traffic areas

• in windy or drafty areas

CAUTION: If you install the

heater in a home garage

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

• locate heater where moving vehicle will not hit it

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:

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

For convenience and efficiency, install heater

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

• in coldest part of room

An optional fan kit is available from your dealer. See Accessories, page 19. If planning to use fan, locate heater near an electrical outlet.

Figure 4 - Mounting Clearances As Viewed From Front of Heater

INSTALLING THERMOSTAT SENSING BULB -

For T-Stat Models Only

Remove clip and bulb from shipping location. Place clip and bulb into operation location (see Figure 7)

Figure 5 - Moving Thermostat Sensing Bulb

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Continued

INFRARED NATURAL GAS HEATER

17 3/8"

17 1/2"

Min.

/2"

Min.

Adjoining Wall

Only Insert Mounting Screws Through Last

Hole On Each End

Floor

INSTALLATION

Continued

INSTALLING HEATER TO WALL

Mounting Bracket

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

Mounting Bracket

Figure 6 - Mounting Bracket Location

Removing Front Panel Of Heater Models FAS-3C and FAS-5C

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 (see Figure 7).

Figure 7 - Removing Front Panel of Heater (Model FAS-3B Shown)

Removing Front Panel Of Heater Models FA-3B and FA-5B

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

2. Pull bottom of lower front panel forward, then down (see Figure 8).

Figure 8 - Removing Front Panel of Heater (Model FA-5B Shown)

Methods For Attaching Mounting Bracket To Wall

Only use last hole on each end of mounting bracket to attach bracket to wall. These two holes are 16 inches apart from their centers. Attach mounting bracket to wall in one of two ways.

1. Attaching to wall stud

2. Attaching to wall anchor

Attaching to Wall Stud: This method pro-

vides the strongest hold. Insert mounting screws through mounting bracket and into wall studs.

Attaching to Wall Anchor: This method

allows you to attach mounting bracket to hollow walls (wall areas between studs) or to solid walls (concrete or masonry).

Decide which method better suits your needs. Either method will provide a secure hold for the mounting bracket.

Marking Screw Locations

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

WARNING: Maintain minimum clearances shown in Figure 8. If you can, provide greater clearances from floor and joining wall.

2. Mark screw locations on wall (see Figure 9).

Note:

Only mark last hole on each end of mounting bracket. Insert mounting screws through these holes only.

3. Remove tape and mounting bracket from wall.

/4"

Min.

Only Insert Mounting

Screws Through Last

Adjoining Wall

Figure 9 - Mounting Bracket Clearances

Hole On Each End

Model FA-5B, FAS-5B

Model FA-3B, FAS-3B

17 3/8"

Floor

17 1/2"

Min.

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OWNER’S MANUAL

INSTALLATION

Continued

Attaching Mounting Bracket To Wall

Note:

Wall anchors, mounting screws, and spacers are in hardware package. The hardware package is provided with heater.

Attaching to Wall Stud Method

For attaching mounting bracket to wall studs

1. Drill holes at marked locations using

9/64" drill bit.

2. Place mounting bracket onto wall. Line

up last hole on each end of bracket with holes drilled in wall.

3. Insert mounting screws through bracket

and into wall studs.

4. Tighten screws until mounting bracket

is firmly fastened to wall studs.

Attaching to Wall Anchor Method

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

1. Drill holes at marked locations using

5/16" drill bit. For solid walls (concrete or masonry), drill at least 1" deep.

2. Fold wall anchor as shown in Figure 10.

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

11).

IMPORTANT:

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

5. Place mounting bracket onto wall. Line

up last hole on each end of bracket with wall anchors.

6. Insert mounting screws through bracket

and into wall anchors.

7. Tighten screws until mounting bracket

is firmly fastened to wall.

Do not hammer

Figure 10 - Folding Anchor

Figure 11 - Popping Open Anchor Wings For Thin Walls

Placing Heater On Mounting Bracket

1. Locate two horizontal slots on back panel of heater (see Figure 12).

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

Horizontal Slots

Stand-Out Tab

Figure 12 - Mounting Heater Onto Mounting Bracket

Mounting Bracket (attached to wall)

Installing Bottom Mounting Screws

1. Locate two bottom mounting holes. These holes are near bottom on back panel of heater (see Figure 13).

2. Mark screw locations on wall.

3. Remove heater from mounting bracket.

4. If installing bottom mounting screws into hollow or solid wall, install wall anchors. Follow steps 1 through 4 under Attaching To Wall Anchor Method. If installing bottom mounting screw into wall stud, drill holes at marked locations using 9/64" drill bit.

5. Replace heater onto mounting bracket.

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

7. Hold spacer in place with one hand. With other hand, insert mounting screw through bottom mounting hole and spacer. Place tip of screw in opening of wall anchor or drilled hole.

8. Tighten both screws until heater is firmly secured to wall. Do not over tighten.

Note:

Do not replace front panel at this time. Replace front panel after making gas connections and checking for leaks (see pages 10 and 11).

Figure 13 - Installing Bottom Mounting Screws

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