Desa Tech 40533 Owner's Manual

UNVENTED (VENT-FREE) UNIVERSAL FIREBOX

SAFETY INFORMATION AND INSTALLATION MANUAL

Shown with optional

cabinet mantel, hearth

CGFB32CA

CIRCULATING LOUVERED MODEL

base.

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.

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 by CSA
under ANSI Z21.91 for use with any ANSI Z21.11.2 ap
proved gas logs.

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

This appliance is only for use with the type of gas indi
cated on the rating plate. This appliance is not convert
ible for use with other gases.

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

Save this manual for future reference.

For more information, visit www.desatech.com

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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: For use only with a listed gas-fired unvented
decorative room heater. Not to exceed 40,000 Btu/Hr. Do not
build a wood fire.

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-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 Common
wealth of Massachusetts.

TABLE OF CONTENTS

Safety Information ............................................... 2

Local Codes ........................................................ 3

Unpacking ........................................................... 3

Product Features ................................................. 3

Product Specifications ......................................... 4

Locating Firebox ................................................. 4

Air For Combustion and Ventilation ..................... 4

SAFETY INFORMATION

Installation ........................................................... 7

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

Replacement Parts ............................................ 12

Accessories ....................................................... 12

Parts Centrals .................................................... 13

Illustrated Parts Breakdown and Parts List ....... 14

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

Back Cover

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12

IMPORTANT: Read this owner’s
manual carefully and completely
before trying to assemble, operate
or service this firebox. Improper
use of this firebox can cause se­rious injury or death from burns,
fire, explosion, electrical shock or
carbon 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.
Avoid any drafts that alter burner
flame patterns. Ceiling fans can
create drafts that alter burner
flame patterns. Altered burner
patterns can cause sooting.

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

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

Firebox front and screen be­come very hot when running
firebox. Keep children a nd
adults away from hot surfaces to
avoid burns or clothing ignition.
Firebox will remain hot for a time
after shutdown. Allow surfaces
to cool before touching.

107331-01H2

10.

SAFETY INFORMATION

Continued

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

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

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

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

1. This firebox shall not be installed in a bedroom
or bathroom.

2. Never install the firebox

• 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 firebox

• in high traffic areas

• in windy or drafty areas

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

4. Do not add extra logs or ornaments such as pine
cones, vermiculite or rock wool. Using these
added items can cause sooting.

5. Vent-free gas log heaters installed in these fire
boxes require fresh air ventilation to run properly.
See Air for Combustion and Ventilation, page 4.

6. Do not run firebox

• where flammable liquids or vapors are used

or stored

• under dusty conditions

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

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

9. Operating vent-free log sets in a firebox above
elevations of 4,500 feet could cause pilot outage.

107331-01H 3

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Do not use the firebox if it has been under water
due to the shock hazard that could result with
the blower accessary (if installed) in place.

11. Prov ide adequat e clea rances around air
openings.

LOCAL CODES

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

ANSI/NFPA70

*Available from:

American National Standards Institute, Inc.

National Fire Protection Association, Inc.

(latest edition).

1430 Broadway

New York, NY 10018

Batterymarch Park

Quincy, MA 02269

UNPACKING

1.

With utility knife, cut the carton all the way
around above the staples on the bottom tray. Lift
the carton off the firebox. Remove packing.

2. Check carton contents for the following:

• Screen assembly

• Screen support rod

• Hardware and parts bag containing the fol

lowing:

- Ownerʼs Operation and Installation Manual

- 2 - Black #10 x 3/8" Phillips screws

3. If any items are missing, inform dealer where
you bought the firebox.

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

PRODUCT FEATURES

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OPERATION

This firebox is designed to accept unvented
decorative gas logs. It requires no outside vent­ing or chimney making installation easy and
inexpensive. When used without the blower the
firebox requires no electricity making it ideal for
emergency backup heat.

BLOWER ACCESSORY

The CGFB32CA firebox will accept the GA3750A
accessory. The variable blower allows you to select
the fan speed you desire. The blower circulates
heated air from the firebox into the room. Use of
blower is optional.

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22 1/2"

16 11/16"

13

1/4"

*

14 1/4"

31 5/8"

34 3/8"

35 5/8"

19 1/4"

12 1/2"

9 3/4"

4 5/8"

2 1/2"

6"

32 3/16"

33 11/16"

2 1/4"

35

1

/

16

"

31

3

/

4

"

1

1

/

4

"

16

1

/

4

"

2

3

/

4

"

3

7

/

8

"

6

3

/

4

"

2

3

/

4

"

6

3

/

8

"

19

3

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8

"

1

1

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4

"

PRODUCT

SPECIFICATIONS

Built-in Nailing Flanges

Figure 1 - Firebox Front View

Electrical Access Hole

Figure 2 - Firebox Side View

*Note: 141/4" is total firebox cavity depth including
brick liner. 13
brick liner.

1

/4" is depth of flat floor including

Figure 3 - Firebox Top View

Gas Line Access

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

2. Everything needed to complete installation.

3. These models CANNOT be installed in a

4. Proper air for combustion and ventilation (see

Todayʼs 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 effi
cient, 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, 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-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:

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1. Unusually Tight Construction

2. Unconfined Space

3. Confined Space

LOCATING FIREBOX

wall and ceiling clearances (see
Clearances, page 7).

bedroom or bathroom.

Air For Combustion and Ventilation

Installation

).

AIR FOR COMBUSTION

AND VENTILATION

WARNING: This firebox shall
not be installed in a confined
space or unusually tight construc
tion 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.

107331-01H4

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AIR FOR COMBUSTION

AND VENTILATION

Continued

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 ventila
tion. However, in buildings of unusually tight con
struction, you must provide additional fresh air.

Unusually tight construction is defined as
construction where:

a. walls and ceilings exposed to the out

side atmosphere have a continuous
water vapor retarder with a rating of
one perm (6x10
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, you must provide additional fresh
air. See Ventilation Air From Outdoors
page 6.

If your home does not meet all of the
criteria above, proceed to Dete rmining
Fresh-Air Flow For Firebox Location.

Confined Space 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

3

per kw) of the aggregate input rating of

(4.8 m
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
there are doorless passageways or ventilation grills
between them.

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kg per pa-sec-m2) or

three

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.

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1. Determine the volume of the space (length x

width x height).

Length x Width x Height =__________cu. ft.

(volume of space)

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Example: Space size 20 ft. (length) x 16 ft.

(width) x 8 ft. (ceiling height) = 2560 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: 2560 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 heater ___________

Gas water heater* ___________

Gas furnace ___________

,

Vented gas heater ___________

Gas fireplace logs ___________

Other gas appliances* + __________

Total = __________

* Do not include direct-vent gas appliances. Di

rect-vent draws combustion air from the outdoors
and vents to the outdoors.

Example:

Gas water heater

Vent-free fireplace + ________

Total = ________

4. Compare the maximum Btu/Hr the space can

support with the actual amount of Btu/Hr used.

_________

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_________
Example: 51,200 Btu/Hr (maximum the space

79,000 Btu/Hr (actual amount of

Btu/Hr (maximum the space can support)

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

can support)

Btu/Hr used)

40,000
__________ Btu/Hr

39,000

79,000

Btu/Hr

Btu/Hr

Btu/Hr

Btu/Hr

Btu/Hr

Btu/Hr

Btu/Hr

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Btu/Hr

Btu/Hr

107331-01H 5

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