FMI VBV42 User Manual
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UNVENTED (VENT-FREE)

UNIVERSAL FIREBOX

OWNER’S OPERATION AND

INSTALLATION MANUAL

PFS ®

US

Non-CirculatingModels

BV36(B), VBV36, BV42(B) AND VBV42

Circulating Models

BV36L(B), VBV36L, BV42L(B) AND VBV42L

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.

For use only with a listed gas-firedunvented decorative room heater Not to exceed 40,000

Btu/Hr. Do not build a wood fire.

Carefully review the instructions supplied with the decorative type unvented room heater for the minimum fireplace size requirement.

Do not install an appliance in this firebox unless this firebox meets the minimum dimensions required for the installation.

This firebox has been tested and approved under ANSI Z21.91 for use with any ANSI Z21.11.2 approved gas logs.

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

For more information, visit www.fmiproducts.com

Table of Contents

Safety...................................................................

2

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

7

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

3

Parts...................................................................

12

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

3

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

14

Locating Firebox...................................................

4

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

14

Product Specifications..........................................

4

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

14

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

5

Warranty...............................................

Back Cover

Safety

WARNING: Improper installation, adjustment, alteration, service or maintenance can causeinjuryorpropertydamage.

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.

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

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

State of Massachusetts: The installation must be made by a licensed plumber or gas fitter in the Commonwealth of

Massachusetts.

Sellers of unvented propane or natural gas-firedsupplemental room heaters shall provide to each purchaser a copy of 527

CMR 30 upon sale of the unit.

Vent-freegas products are prohibited for bedroom and bathroom installation in the Commonwealth of Massachusetts.

WARNING: This product contains and/or generates chemicals 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 fireplace can cause serious injury or death from burns, fire, explosion,electricalshockandcarbon monoxide poisoning.

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

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

WARNING:Donotuseablower insert, heat exchanger insert orotheraccessorynotapproved for use with this firebox.

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Safety

Continued

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

Fireboxfrontandscreenbecome very hot when running heater. Keep children and adults away from hot surface to avoid burns or clothing ignition. Firebox will remain hot for a time after shutdown.Allowsurfacetocool before touching.

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

You must operate this fireplace with the provided fireplace screen, hood if provided, in place. Make sure these parts are in place and screens are closed before running firebox.

The supplied hood may not be replacedwithahoodwhichmay be provided with a log heater.

Local Codes

Install and use heater with care. Follow all local codes. In the absence of local codes, use the latest edition of The National Fuel Gas Code, ANSI Z223.1/NFPA 54*. Firebox must be electrically grounded in accordance with theNational Electrical Code, ANSI/NFPA70

(latest edition). *Available from:

American National Standards Institute, Inc.

1430 Broadway

New York, NY 10018

National Fire Protection Association, Inc.

Batterymarch Park

Quincy, MA 02269

Keepthefireplaceareaclearand freefromcombustiblematerials, gasoline and other flammable vapors and liquids.

1.Do not use this firebox as a wood-burningfireplace. Use only decorative unvented room heaters (log sets).

2.Do not add extra logs or ornaments such as pinecones,vermiculiteorrockwool.Using these added items can cause sooting.

3.Use only provided hood.

4.Vent-freegas log heaters installed in these fireboxes require fresh air ventilation to run properly. SeeAir for Combustion and Ventilation, page 5.

5.Do not run firebox

where flammable liquids or vapors are used or stored

under dusty conditions

6.Do not use this firebox to cook food or burn paper or other objects.

7.Turn firebox off and let cool before servicing. Only a qualified service person should service and repair firebox.

8.Operating firebox above elevations of

4,500 feet could cause pilot outage.

9.Donotusefireboxifithasbeenunderwater due to shock hazard that could result with the blower accessary (if installed) in place.

Product Features

Operation

This firebox is designed for use with approved

ANSI Z21.11.2 decorative type unvented room heaters. (Physical size limitations apply. Refer to minimum firebox requirements supplied with log heater.) It requires no outside venting or chimney making installation easy and inexpensive. This firebox requires no electricity making it ideal for emergency backup heat.

OUTSIDE AIR KIT ACCESSORY

The optional AK4 air kit provides additional outdoor air to improve burner efficiency and reduce build-upof condensation in living space.

Follow instructions included with air kit.

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Locating Firebox

Planning

Plan where you will install the firebox.This will save time and money later when you install the firebox. Before installation, consider the following:

1.Where the firebox will be located.Allow for wall and ceiling clearances (see Installation Clearances, page 8).

2.Everything needed to complete installation.

3.These models CANNOT be installed in a bedroom unless the maximum Btu rating of the installed vent-freelog set is less than 10,000 Btu/hr.

4.Proper air for combustion and ventilation (page 6).

Product Specifications

 

21"

 

Left Side

 

View with

 

Air Kit

22.5" (36" Models)

Outside Air

28.5" (42" Models)

 

Kit Location

 

(Optional)

 

25°

Firebox Top View

25"

 

 

13"

 

3.875"

9.25"

21"

13"

12.5"

19"

 

36.125" (36" Models)

42" (42" Models)

38.125" (36" Models)

44.125" (42" Models)

40" (36" Models)

46" (42" Models)

3.875"

36.875"

21.375"

33.125"

26.5" 19.75" 24.5"

6.664

8"

 

9.75"

Right Side View

Front View

Figure 1 - Firebox Dimensions

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Air For Combustion and Ventilation

WARNING: This heater shall notbeinstalledinaroomorspace unlesstherequiredvolumeofindoor combustion air is provided by the method described in the

National Fuel Gas Code, ANSI Z223.1/NFPA54, the International Fuel Gas Code,or applicable local codes. Read the following instructionstoinsureproperfresh airforthisandotherfuel-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-burningappliances need fresh air for proper combustion and ventilation.

Exhaust fans, fireboxes, 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-burningappliances.

PROVIDING ADEQUATE VENTILATION

The following are excerpts from National Fuel Gas Code, ANSI Z223.1/NFPA 54, 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 page 5 through 7 will help you classify your space and provide adequate ventilation.

Unusually Tight Construction

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

Unusually tight construction is defined as construction where:

a.walls and ceilings exposed to the outside atmosphere have a continuous water vapor retarder with a rating of one perm (6 x 10-11 kg perpa-sec-m2)or less with openings gasketed or sealedand

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-ceilingjoints, 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 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 Firebox Location, page 6.

Confined and Unconfined Space

The National Fuel Gas Code, ANSI Z223.1/ NFPA 54defines 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.

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

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Air For Combustion and Ventilation

Continued

DETERMINING FRESH-AIRFLOW 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: Space size 22 ft. (length) x 18 ft. (width) x 8 ft. (ceiling height) = 3168 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 = (Maximum Btu/Hr the space can support)

Example: 3168 cu. ft. (volume of space) x 20 = 63,360 (maximum Btu/Hr the space can support)

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

Vent-freeheater

________

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-ventgas appliances.Direct-ventdraws combustion air from the outdoors and vents to the outdoors.

Example:

 

 

 

Gas water heater

 

40,000

Btu/Hr

Vent-freeheater

+

39,000

Btu/Hr

Total

=

79,000

Btu/Hr

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: 63,360 Btu/Hr (maximum the space can support)

79,000 Btu/Hr (actual amount of Btu/Hr used)

The space in the above example is a confined space because the actual Btu/Hr used is more than the maximum Btu/Hr the space can support. You must provide additional fresh air. Your options are as follows:

A.Rework worksheet, adding the space of an adjoining room. If the extra space provides an unconfined space, remove door to adjoining room or add ventilation grills between rooms. See Ventilation Air From Inside Building, page 7.

B.Vent room directly to the outdoors. See

Ventilation Air From Outdoors, page 7.

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.

WARNING:Iftheareainwhich theheatermaybeoperateddoes notmeettherequiredvolumefor indoorcombustionair,combustion and ventilation air shall be provided by one of the methods described in theNational Fuel GasCode,ANSIZ223.1/NFPA54, theInternational Fuel Gas Code, or applicable local codes.

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