Desa VF-24N-MHD, VF-18P-MHd, VF-24P-MHD, VF-18N-MHD User Manual

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Desa VF-24N-MHD, VF-18P-MHd, VF-24P-MHD, VF-18N-MHD User Manual

UNVENTED (VENT-FREE) GAS LOG HEATER OWNER’S OPERATION AND INSTALLATION MANUAL

Models VF-18N-MHD, VF-18P-MHD, VF-24N-MHD

and VF-24P-MHD

WARNING: If the information in this manual is not followed exactly, a fire or explosion may result causing property damage, personal injury or loss of life.

Do not store or use gasoline or other flammable vapors and liquids in the vicinity of this or any other appliance.

WHAT TO DO IF YOU SMELL GAS

Do not try to light any appliance.

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

Immediatelycallyourgassupplierfromaneighbor’s phone. Follow the gas supplier’s instructions.

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

Installationandservicemustbeperformedbyaqualified installer, service agency or the gas supplier.

INSTALLER: Leave this manual with the appliance. CONSUMER: Retain this manual for future reference.

For more information, visit www.desatech.com

WARNING: Improper installation, adjustment, alteration, service or maintenance can cause injury or propertydamage.Refertothismanualforcorrectinstallation and operational procedures. For assistance or additional information consult 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 a listed ventless firebox enclosure. It is de- sign-certified for these installations in accordance with ANSI 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 beprovided.RefertoAir for Combustion and Ventilation section on page 5 of this manual.

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

TABLE OF CONTENTS

Safety Information................................................

3

Cleaning and Maintenance.

...............................

19

Product Identification............................................

4

Troubleshooting.................................................

 

21

Local Codes.........................................................

5

Wiring Diagram..................................................

 

24

Unpacking............................................................

5

Replacement Parts.............................................

 

25

Product Features..................................................

5

Service Hints......................................................

 

25

Air For Combustion and Ventilation......................

5

Technical Service...............................................

 

25

Installation............................................................

8

Accessories........................................................

 

25

Operating Heater................................................

15

Illustrated Parts Breakdown ........and Parts List

26

Inspecting Burners ............................................

18

Warranty Information............................

Back Cover

 

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Safety Information

WARNING:Thisproductcontainsand/orgenerateschemicals known to the State of California to cause cancer or birth defects or other reproductive harm.

IMPORTANT: Read this owner’s manualcarefullyandcompletely 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:Carbonmonoxide poisoning may lead to death!

CarbonMonoxidePoisoning:Early signs of carbon monoxide poisoning resemble the flu, with head- aches, 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 orlungdiseaseoranemia,thoseundertheinfluence of alcohol and those at high altitudes.

Natural and Propane/LP Gas: Natural and pro- pane/LP gases are odorless. An odor-making agent is added to these gases. 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 warn- ings. 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.

WARNING: Do not use a blower insert, heat exchanger insertorotheraccessorynotapproved for use with this heater.

WARNING: Do not allow fans to blow directly into the heater. Avoidanydraftsthatalterburner flame patterns. Ceiling fans can create drafts that alter burner flame patterns. Altered burner patterns can cause sooting.

WARNING: Do not place log scraps or lava rocks on burner.

Due to high temperatures, the applianceshouldbelocatedout oftrafficandawayfromfurniture and draperies.

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

Heaterbaseassemblybecomes very hot when running heater.

Keep children and adults away fromhotsurfacetoavoidburns or clothing ignition. Heater will remain hot for a time after shutdown.Allowsurfacetocool before touching.

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

You must operate this heater with a fireplace screen in place.

Make sure fireplace screen is closed before running heater.

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

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safety information

Continued

1.This appliance is only for use with the type of gasindicatedontheratingplate.Thisappliance is not convertible for use with other gases.

2.Do not place propane/LP supply tank(s) in- side any structure. Locate propane/LP supply tank(s) outdoors (propane/LP units only).

3.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

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

5.Before installing in a solid fuel burning fire- place, the chimney flue and firebox must be cleanedofsoot,creosote,ashesandloosepaint by a qualified chimney cleaner. Creosote will ignite if highly heated. Inspect chimney flue for damage. If damaged, repair flue before operating heater.

6.Do not burn solid-fuel in a masonry or UL127 factory-built fireplace in which a vent-free room heater is installed.

7.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. Make sure there are no obstructions across openings of fireplace.

8.To prevent the creation of soot, follow the instructions in Cleaning and Maintenance, page 19.

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.Thisheaterneedsfresh,outsideairventilationto runproperly.Thisheaterhasanoxygendepletion sensing (ODS) pilot light safety system. The ODS shuts down the heater if not enough fresh air is available. See Air for Combustion and Ventilation, page 5. If heater keeps shutting off, see Troubleshooting, page 21.

11.Do not run heater

where flammable liquids or vapors are used or stored

under dusty conditions

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

13.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.

14.Do not operate heater if any log is broken. Do not operate heater if a log is chipped (dimesized or larger).

15.Turn heater off and let cool before servicing or repairing. Only a qualified service person should install, service or repair heater.

16.This heater does not need to be connected to any external electrical source.

17.To prevent performance problems, do not use propane/LP fuel tank of less than 100 lb. capacity (propane/LP units only).

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

19.Provide adequate clearances around air openings.

State of Massachusetts: The installa- tion must be made by a licensed plumber or gas fitter in the Commonwealth of Massachusetts.

Sellers of unvented propane or natural gas-fired supplemental room heaters shall provide to each purchaser a copy of 527 CMR 30 upon sale of the unit.

Vent-free gas products are prohibited for bedroom and bathroom installation in the

Commonwealth of Massachusetts.

Product

Identification

Log Set

Assembly

 

 

Control Valve

Hand-Held

Chassis

with Remote

Remote Control

Receiver

 

Assembly

Module

 

 

Figure 1 - Product Identification

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Local Codes

Install and use heater with care. Follow all local codes. In the absence of local codes, use the lat- est edition of The National Fuel Gas Code ANSI Z223.1/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

CAUTION:Donotremovethe data plates from the grate assembly. The data plates contain important warranty and safety information.

1.Remove log set assembly from carton. Note: Do not pick up assembly by logs. This coulddamageheater.Alwayshandleassembly by grate.

2.Remove all protective packaging applied to log set for shipment.

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

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 realistic flames and glowing ceramic logs/coals. This heater is designed forvent-freeoperationwithfluedamperclosed.Ithas beentestedandapprovedtoANSIZ21.11.2standard for unvented heaters. State and local codes in some areas prohibit the use of vent-free heaters.

Safety Pilot

This heater has a pilot with an Oxygen Deple- tion 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.

Remote ignition and control

This gas log set has a battery powered electronic remote ignition and control. This system requires no matches or other source to light log set.

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 combustionandventilationair.Readthe 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.

Whileitisgoodtomakeyourhomeenergyefficient, your home needs to breathe. Fresh air must enter your home. All fuel-burning appliances need fresh air for proper combustion and ventilation.

Exhaust fans, fireplaces, clothes dryers and fuel burning appliances draw air from the house to operate. You must provide adequate fresh air for these appliances. This will insure proper venting of vented fuel-burning appliances.

PROVIDING ADEQUATE

VENTILATION

The following are excerpts from National Fuel Gas Code, ANSI Z223.1/NFPA 54, Section 5.3, Air for Combustion and Ventilation.

All spaces in homes fall into one of the three fol- lowing ventilation classifications:

1.Unusually Tight Construction

2.Unconfined Space

3.Confined Space

The information on pages 5 through 7 will help you classifyyourspaceandprovideadequateventilation.

Unusually Tight Construction

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

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air for combustion and ventilation

Continued

Unusually tight construction is defined as construction where:

a.walls and ceilings exposed to the outside atmosphere have a continuous watervaporretarderwitharatingofone perm (6 x 10-11 kg per pa-sec-m2) or less with openings gasketed or sealed and

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

c.caulking or sealants are applied to areas such as joints around window and door frames, between sole plates and floors, between wall-ceiling joints, 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,youmustprovideadditionalfreshair.

See Ventilation Air From Outdoors, page 7.

If your home does not meet all of the three criteria above, proceed to Determining Fresh-Air Flow For Heater Location.

Confined and Unconfined Space

The National Fuel Gas Code, ANSI Z223.1/NFPA 54 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 com- municating directly with the space in which the appliances are installed*, through openings not furnished with doors, are considered a part of the unconfined space.

* Adjoining rooms are communicating only if therearedoorlesspassagewaysorventilationgrills between them.

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 pas- sageways 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: Space size 20 ft. (length) x 16 ft. (width) x 8 ft. (ceiling height) = 2,560 cu. ft. (volume of space)

If additional ventilation to adjoining room is supplied with grills or openings, add the volume of these rooms to the total volume of the space.

2.Multiply the space volume by 20 to determine the maximum Btu/Hr the space can support.

___________ (volume of space) x 20 = (Maxi- mum Btu/Hr the space can support)

Example: 2,560 cu. ft. (volume of space) x 20 = 51,200 (maximum Btu/Hr the space can support)

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

Vent-free fireplace

____________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. Di-

rect-ventdrawscombustionairfromtheoutdoors

and vents to the outdoors.

 

 

Example:

 

40,000

 

Gas water heater

 

Btu/Hr

Vent-free fireplace

+

33,000

Btu/Hr

Total

=

73,000

Btu/Hr

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

__________Btu/Hr(maximumthespacecansupport)

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

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

73,000 Btu/Hr (actual amount of Btu/Hr used)

The space in the 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 ad- ditional fresh air. Your options are as follows:

A.Reworkworksheet,addingthespaceofanadjoin- ingroom.Iftheextraspaceprovidesanunconfined space, remove door to adjoining room or add ventilation grills between rooms. See Ventilation Air From Inside Building, page 7.

B.Vent room directly to the outdoors. See Ventilation Air From Outdoors, page 7.

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

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air for combustion and ventilation

Continued

If the actual Btu/Hr used is less than the maximum Btu/Hr the space can support, the space is an uncon- fined space. You will need no additional fresh air ventilation.

WARNING: If the area in which the heater may be operatedissmallerthanthatdefined as an unconfined space or if the building is of unusually tight construction, provide adequate combustion and ventilation air byoneofthemethodsdescribed in the National Fuel Gas Code, ANSIZ223.1/NFPA54Section5.3 or applicable local codes.

VENTILATION AIR

Ventilation Air From Inside Building

This fresh air would come from an adjoining un- confined 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, ANSI Z223.1/NFPA 54, Section 5.3, Air for Combustion and Ventilation for required size of ventilation grills or ducts.

Ventilation Air From Outdoors

Provideextrafreshairbyusingventilationgrillsor 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, ANSI Z223.1/NFPA 54, Section 5.3, Air for Combustion and Ventilation for required size of ventilation grills or ducts.

IMPORTANT: Do not provide openings for inlet or outlet air into attic if attic has a thermostatcontrolledpowervent.Heatedairenteringtheattic will activate the power vent.

 

Outlet

Ventilated

 

Attic

 

Air

 

 

Outlet

 

 

Air

 

To Attic

 

 

 

 

To

 

 

Crawl

Inlet

 

Space

 

 

Air

 

 

 

Inlet Air

Ventilated

 

Crawl Space

 

 

Figure 3 - Ventilation Air from Outdoors

 

 

12"

Ventilation

 

Ventilation Grills

Grills

 

Into Adjoining

Or

Into Adjoining Room,

Room,

Option 2

Remove

Option 1

 

Door into

 

 

 

 

Adjoining

 

 

Room,

 

 

Option

 

 

3

 

 

 

12"

Figure 2 - Ventilation Air from Inside Building

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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 centralheatingsystem,youmay run system’s circulating blower whileusingheater.Thiswillhelp circulatetheheatthroughoutthe 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.

WARNING:Beforeinstallingin a solid fuel burning fireplace, the chimneyflueandfireboxmustbe cleaned of soot, creosote, ashes andloosepaintbyaqualifiedchimney cleaner. Creosote will ignite if highly heated. A dirty chimney fluemaycreateanddistributesoot withinthehouse.Inspectchimney and firebox flue for damage. If damaged, repair flue and firebox before operating heater.

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 heat-resistant sealant. Do not seal chimney flue damper.

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 42" 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, but not limited to, tobacco smoke, aromatic candles, cleaning fluids,oilorkerosenelamps,etc.)in the air exist, may discolor walls or cause odors.

WARNING: Antenna and ignition cable must maintain a spacing of 3/4". Failure to keep them separated will result in damagetothereceiver.SeeWiring Diagram on page 24.

Important: Vent-free heaters add moisture to theair.Althoughthisisbeneficial,installingheater inroomswithoutenoughventilationairmaycause mildew to form from too much moisture. See Air for Combustion and Ventilation, page 5.

CHECK GAS TYPE

Use the correct gas type (natural or propane/LP) for your unit. If your gas supply is not correct, do not install heater. Call dealer where you bought heater for proper type heater.

WARNING: This appliance is equipped for (natural or propane/LP) gas. Field conversion is not permitted.

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Installation

Continued

installation and clearances for vent-free operation

WARNING: Maintain the minimumclearances.Ifyoucan, provide greater clearances from floor, ceiling and adjoining wall.

MINIMUM FIREPLACE

CLEARANCE TO

COMBUSTIBLE MATERIALS

Log Size

18" or 24"

 

 

Side Wall

16"

 

 

Ceiling

42"

 

 

Floor

5"

 

 

LOG SIZING REQUIREMENTS

Minimum Firebox Size

Log Height Depth Front Rear*

Size

 

 

Width

Width

18"

20"

14"

35"

22 1/2"

24"

20"

14"

35"

22 1/2"

*Measured at 14" depth

Carefully follow the instructions below. This will ensure safe installation into a masonry, UL127listed manufactured fireplace or listed vent-free firebox enclosure.

Minimum Clearances For Side

Combustible Material, Side Wall and

Ceiling

A. Clearances from the side of the fireplace cabinet to any combustible material and wall should follow diagram in Figure 4.

Example: The face of a mantel, bookshelf, etc. is made of combustible material and protrudes 3 1/2" from the wall. This combus- tible material must be 4" from the side of the fireplace cabinet (see Figure 4).

Note: When installing your gas logs into a manufactured firebox, follow firebox manufacturer’s instructions for minimum clearances to combustible materials.

B. Clearancesfromthetopofthefireplaceopening to the ceiling should not be less than 42".

Example

*

*Minimum 16" from Side Wall

Figure 4 - Minimum Clearance for Combustible to Wall

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 informa- tion below.

You must have noncombustible material(s) above fireplace opening. Noncombustible materials (such as slate, marble, tile, etc.) must be at least 1/2" thick. With sheet metal, you must have non- combustible material behind it. Noncombustible materialmustextendatleast8"up(forallmodels). If noncombustible material is less than 12", you must install the fireplace hood accessory (24" models only). See Figure 5, page 10, for minimum clearances.

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" thick. With sheet metal, you must have non- combustible material behind it. Noncombustible materialmustextendatleast8"up(forallmodels). If noncombustible material is less than 12", you must install the fireplace hood accessory. Even if noncombustible material is more than 12", you may need the hood accessory to deflect heat away from your mantel shelf. See Figures 5, 6 and 7, page 10, for minimum clearances.

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