Desa HDFB32C Original instructions

WARNING: If the information in this manual is not fol-
lowed exactly, a re 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
replace size requirement.
Do not install an appliance in this rebox unless this
rebox meets the minimum dimensions required for
the installation.
This rebox 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
INSTALLER: Leave this manual with the appliance.
CONSUMER: Retain this manual for future reference.
For more information, visit www.desatech.com
UNVENTED (VENT-FREE) UNIVERSAL FIREBOX
SAFETY INFORMATION AND INSTALLATION MANUAL
Shown with optional
cabinet mantel, hearth
base.
HDFB32C
CIRCULATING LOUVERED MODEL

www.desatech.com 113900-01D2
WARNING: Improper
installation, adjustment,
alteration, service or
maintenance can cause
injury or property dam-
age. Refer to this manual
for correct installation
and operational proce-
dures. For assistance or
additional information
consult a qualified in-
staller, service agency or
the gas supplier.
WARNING: For use
only with a listed gas-
fired unvented decora-
tive room heater. Not to
exceed 40,000 Btu/Hr. Do
not build a wood re.
IMPORTANT: Read this owner’s
manual carefully and completely
before trying to assemble, op-
erate or service this rebox.
Improper use of this rebox can
cause serious injury or death
from burns, re, explosion, elec-
trical shock or carbon monoxide
poisoning.
WARNING: Any change to
this rebox or its controls can
be dangerous.
WARNING: Do not use a blow-
er insert, hood, heat exchanger
insert or other accessory not ap-
proved for use with this heater.
WARNING: Do not allow fans
to blow directly into the rebox.
Avoid any drafts that alter burner
ame patterns. Ceiling fans can
create drafts that alter burner
ame patterns. Altered burner
patterns can cause sooting.
Due to high temperatures, the
rebox should be located out of
trafc and away from furniture
and draperies.
Do not place clothing or other
ammable material on or near
rebox. Never place any objects
on the rebox or logs.
Firebox front and screen be-
come very hot when running
firebox. Keep children and
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.
Carefully supervise young chil-
dren when they are in the room
with rebox.
SAFETY INFORMATION
TABLE OF CONTENTS
Safety Information ............................................... 2
Local Codes......................................................... 3
Unpacking............................................................ 3
Product Features ................................................. 4
Locating Firebox ................................................. 4
Air For Combustion and Ventilation..................... 4
Installation ........................................................... 7
Technical Service............................................... 13
Replacement Parts ............................................ 13
Accessories ....................................................... 14
Parts Centrals.................................................... 15
Illustrated Parts Breakdown and Parts List........ 16
Warranty Information ...........................Back Cover

www.desatech.com
113900-01D 3
You must operate this replace
with the provided replace screen
(closed), hood and brick liner in
place. Make sure these parts are
in place before running rebox.
Keep the rebox area clear and
free from combustible materials,
gasoline and other ammable
vapors and liquids.
1. This rebox shall not be installed in a
bedroom or bathroom.
2. Neverinstalltherebox
• in a recreational vehicle
• where curtains, furniture, clothing or
other ammable objects are less than
36" from the front and 42" from the top.
For side clearances see Figure 6 on
page 8
•inhightrafcareas
• in windy or drafty areas
3. Donotusethisreboxasawood-burning
replace.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
reboxes require fresh air ventilation to
run properly. See Air for Combustion and
Ventilation, page 4.
6. Donotrunrebox
•whereammableliquidsorvaporsare
used or stored
• under dusty conditions
7. Do not use this rebox to cook food or
burnpaperorotherobjects.
8. Turnreboxoffandletcoolbeforeservic-
ing.Onlyaqualiedservicepersonshould
serviceandrepairrebox.
9. Operatingvent-freelogsetsinarebox
above elevations of 4,500 feet could
cause pilot outage.
10.Donotusethereboxifithasbeenun-
der water due to the shock hazard that
could result with the blower accessary (if
installed) in place.
11.Provideadequateclearancesaroundair
openings.
SAFETY INFORMATION
Continued
LOCAL CODES
Installandusereplace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
the National 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
State of Massachusetts: The installa-
tion must be made by a licensed plumber
or gas tter in the Commonwealth of
Massachusetts.
Sellers of unvented propane or natural
gas-red 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.
UNPACKING
1. With utility knife, cut the carton all the way
around above the staples on the bottom
tray.Liftthecartonofftherebox.Remove
packing.
2. Check carton contents for the following:
• Screen assembly
• Screen support rod
• Hardware and parts bag containing the
following:
Owner’s Operation and Installation
Manual
Black #10 x 3/8" Phillips screws
3. If any items are missing, inform dealer
whereyouboughttherebox.
4. Check all items for any shipping damage.
If damaged, promptly inform dealer where
youboughtrebox.

www.desatech.com 113900-01D4
22
1
/
2
"
16
11
/
16
"
13
1
/
4
"
*
14
1
/
4
"
31
5
/
8
"
34
3
/
8
"
35
5
/
8
"
19
1
/
4
"
Figure 3 - Firebox Top View
*Note: 141/4"istotalreboxcavitydepthincluding
brick liner. 131/4" is depth of at oor including
brick liner.
LOCATING FIREBOX
Planwhereyouwillinstalltherebox.Thiswill
save time and money later when you install
therebox.Beforeinstallation,considerthe
following:
1. Wherethereboxwillbelocated.Allowfor
wall and ceiling clearances (see Installa-
tion Clearances, page 8).
2. Everything needed to complete installa-
tion.
3. These models CANNOT be installed in a
bedroom or bathroom.
4. Proper air for combustion and ventilation
(see Air For Combustion and Ventila-
tion).
AIR FOR COMBUSTION
AND VENTILATION
WARNING: This rebox shall
not be installed in a conned
space or unusually tight construc-
tion unless provisions are provid-
ed 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efcient
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.
12 1/2"
9 3/4"
4 5/8"
2 1/2"
6"
32 3/16"
2 1/4"
Electrical Access Hole Gas Line Access
Figure 2 - Firebox Side View
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
/
8
"
1
1
/
4
"
Built-in Nailing Flanges
Figure 1 - Firebox Front View
PRODUCT FEATURES
OPERATION
Thisreboxisdesignedtoacceptunvented
decorativegaslogs.Itrequiresnooutsidevent-
ing or chimney making installation easy and
inexpensive. When used without the blower
the rebox requires no electricity making it
ideal for emergency backup heat.
BLOWER ACCESSORY
Thisreboxhasanelectricblower.Thevari-
able blower allows you to select the fan speed
you desire. The blower circulates heated air
fromthereboxintotheroom.Useofblower
is optional.

www.desatech.com
113900-01D 5
While it is good to make your home energy
efcient,yourhomeneedstobreathe.Fresh
air must enter your home. All fuel-burning ap-
pliances need fresh air for proper combustion
and ventilation.
Exhaustfans,reboxes,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
followingventilationclassications:
1. Unusually Tight Construction
2.UnconnedSpace
3.Conned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 combus-
tion and ventilation. However, in buildings of
unusually tight construction, you must provide
additional fresh air.
Unusually tight construction is dened 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 (6x10-11 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 oors, between wall-ceiling joints,
between wall panels, at penetrations
for plumbing, electrical and gas lines
and at other openings.
AIR FOR COMBUSTION
AND VENTILATION
Continued
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 three
criteria above, proceed to Determining
Fresh-Air Flow For Firebox Location.
Conned Space and Unconned Space
The National Fuel Gas Code ANSI Z223.1/
NFPA 54denesaconned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 ag-
gregate input rating of all appliances installed
inthatspaceandanunconned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 un-
connedspace.
*Adjoiningroomsarecommunicatingonlyif
there are doorless passageways or ventilation
grills between them.
DETERMINING FRESH-AIR FLOW
FOR HEATER LOCATION
Determining if You Have a Conned or
Unconned Space
Use this work sheet to determine if you have
aconnedorunconned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 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)

www.desatech.com 113900-01D6
AIR FOR COMBUSTION
AND VENTILATION
Continued
WARNING: If the area in
which the rebox and gas log
heater may be operated is
smaller than that dened as
an unconned space or if the
building is of unusually tight
construction, provide adequate
combustion and ventilation air
by one of the methods described
in the National Fuel Gas Code,
ANSI Z223.1/NFPA54 Section 5.3
or applicable local codes.
VENTILATION AIR
Ventilation Air From Inside Building
This fresh air would come from an adjoin-
ing unconned space. When ventilating to
an adjoining unconned space, you must
provide two permanent openings: one within
12" of the ceiling and one within 12" of the
ooronthewallconnectingthetwospaces
(see options 1 and 2, Figure 4). You can also
removedoorintoadjoiningroom(seeoption
3, Figure 4). 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.
Figure 4 - Ventilation Air from Inside
Building
Or
Remove
Door into
Adjoining
Room,
Option
3
Ventilation Grills
Into Adjoining Room,
Option 2
Ventilation
Grills
Into Adjoining
Room,
Option 1
12"
12"
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replace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.
Example:
Gas water heater _________ Btu/Hr
 Vent-freereplace + ________ Btu/Hr
Total = ________ 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: 51,200 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conned
space because the actual Btu/Hr used is more
than the maximum Btu/Hr the space can sup-
port. 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unconnedspace,removedoortoadjoin-
ing room or add ventilation grills between
rooms. See Ventilation Air From Inside
Building below.
B. Vent room directly to the outdoors. See
Ventilation Air From Outdoors.
C. Install a lower Btu/Hr heater, if lower
Btu/Hrsizemakesroomunconned.
If the actual Btu/Hr used is less than the
maximum Btu/Hr the space can support, the
spaceisanunconnedspace.Youwillneed
no additional fresh air ventilation.
40,000
39,000
79,000

www.desatech.com
113900-01D 7
WARNING: Never install the
rebox
• in a bedroom or bathroom
• in a recreational vehicle
• where curtains, furniture,
clothing or other ammable
objects are less than 36" from
the front and 42" from the top
of rebox - for side clearances
see Figure 6, page 8
• in high trafc areas
IMPORTANT: Vent-free gas log heaters add
moisturetotheair.Althoughthisisbenecial,
installing rebox in rooms without enough
ventilation air may cause mildew to form from
too much moisture. See Air for Combustion
and Ventilation, page 4.
IMPORTANT:Makesurethereboxislevel.
If rebox is not level, log set will not work
properly.
Note:Yourreboxisdesignedtobeusedin
zero clearance installations. Wall or framing
material can be placed directly against any
exterior surface on the rear, sides or top of
yourrebox,exceptwherestandoffspacers
are integrally attached. If standoff spacers
areattachedtoyourrebox,thesespacers
can be placed directly against wall or fram-
ing materials.
Use the dimensions shown for rough openings
to create the easiest installation (see Built-In
Firebox Installation, page 12).
Ventilation Air From Outdoors
Provide extra fresh air by using ventilation
grills or ducts. You must provide two perma-
nent openings: one within 12" of the ceiling
andonewithin12"oftheoor.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 thermo-
stat-controlled power vent. Heated air entering
the attic will activate the power vent.
Figure 5 - Ventilation Air from Outdoors
Outlet
Air
Ventilated
Attic
Outlet
A
ir
Inlet
Air
Inlet Air Ventilated
Crawl Space
To
Crawl
Space
To Attic
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 pri-
mary 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 qualied ser-
vice person must install rebox.
Follow all local codes.
AIR FOR COMBUSTION
AND VENTILATION
Continued

www.desatech.com 113900-01D8
INSTALLATION
Continued
ELECTRICAL HOOKUP
Thisreboxhasablowerassemblywithan
electrical cord. This electrical cord is ve
feet in length. You must locate the rebox
within reach of a 120-volt grounded electri-
cal outlet. If not, you must install an electrical
outletwithinreachofreboxpowercord.The
GA3555 outlet accessory may be used for
built-in installation.
NOTICE: A certied electrician
must connect electrical wiring to
duplex outlet for built-in instal-
lation. Follow all local codes. In
absence of local codes, follow
the National Electrical Code,
ANSI/NFPA 70 (Latest Edition).
Supplied
Firebox Hood
Must Be Used
at All Times
Wire-mesh
Screen
Firebox
Mantel Shelf
13" 16" 19" 21"
2
1/2
"
6"
8"
10"
For
CGFB32C
Series
circulating
louvered
models
only
Note:
A
ll vertical measurements
are from top of fireplace
opening to bottom of mantel
shelf. All measurements
are in inches.
Facing material (above
firebox) may be of
combustible material,
including decorative
mantel ornaments.
Figure 7 - Minimum Mantel Clearances
for Built-In Installation
CAUTION: Close screens
before operation of vent-free
gas log heater. Do not allow the
heater to touch or extend beyond
the replace screen.
If your installation does not meet the mini-
mum clearances in Figure 7, you must:
• raise the mantel to an acceptable height,
OR
• remove the mantel.
*
Example
Figure 6 - Minimum Clearance for
Combustible to Wall
*Minimum 16" from Side Wall
Mantel Clearances for Built-In
Installation
Ifplacingcustommantelabovebuilt-inre-
box, you must meet the minimum allowable
clearance between mantel shelf and top of
reboxopeningshowninFigure7.Theseare
the minimum allowable mantel clearances
for a safe installation. Use larger clearances
wherever possible to minimize the heating of
objectsandmaterialsplacedonthemantel.
INSTALLATION CLEARANCES
WARNING: Maintain the
minimum clearances. If you can,
provide greater clearances from
oor, ceiling and adjoining wall.
Carefully follow the instructions below. This
will ensure safe installation.
Minimum Clearances For Side
Combustible Material, Side Wall and
Ceiling
A. Clearancesfromthesideofthereplace
cabinet to any combustible material and
wall should follow diagram in Figure 6.
Example: The face of a mantel, bookshelf,
etc. is made of combustible material and
protrudes 3 1/2" from the wall. This com-
bustible material must be 4" from the side
ofthereplaceopening(seeFigure6).
B. Clearancesfromthetopofthereplace
opening to the ceiling should not be less
than 42".

www.desatech.com
113900-01D 9
Side
Opening
Support Bracket
Opening
Blower Power
Cord
Figure 8 - Routing Blower Power Cord
for Conventional Installation
Electrical
Outlet
Blower
INSTALLING BLOWER SPEED
CONTROL
Notice: If a log set is currently in-
stalled in the rebox, disconnect
log set from gas supply and remove
from rebox. Contact a qualied
service person to do this.
Note:Appearanceofreboxmayvaryslightly
depending on model.
1. Removethereboxbottom:
a. Remove the 2 screws that secure the
bottomoftherebox(seeFigure9,).
b. Carefullyraiseandremovetherebox
bottomfromtherebox.
WARNING: If there is a du-
plex electrical outlet installed in
the right side of the bottom of
the replace base area, be sure
that the electrical power to the
outlet is turned off before pro-
ceeding with blower installation.
Failure to do this may result in
serious injury.
2. Remove shipping screw from speed
control in right support leg. Place speed
control against inner wall of front panel,
pushing the plastic control shaft forward
through the opening (see Figure 10).
INSTALLATION
Continued
3. While supporting speed control, secure
control shaft with lock nut by pushing and
turning lock nut with pliers clockwise until
it is tight against front panel. Place control
knob provided on shaft (see Figure 10).
4. Plug in blower power cord.
a. If your rebox is installed as a free-
standing unit, determine whether the
power cord will exit the left side or the
rightsideoftherebox.Install1plastic
bushing provided into the 11/2" hole in
theoorsupportontheexitside.Install
the second plastic bushing provided
into the 11/2" hole in the outer casing
through which the power cord will exit
(see Figure 11). Route power cord
through both plastic bushings and plug
the power cord into a 3-prong grounded
wallreceptacleneartherebox.
b. If your firebox installation is re-
cessed and/or pre-wired, plug the
power cord into the duplex outlet
provided.
Figure 10 - Attaching Speed Control
Figure 9 - Removing Screws from
Firebox Bottom
Screws
Control Shaft
Speed
Control
Lock Nut
Control
Knob
Figure 11 - Installing Plastic Bushing for
Power Cord
Plastic Bushing

www.desatech.com 113900-01D10
INSTALLATION
Continued
CAUTION: Never touch the
blower wheel while in operation.
5. Turn on power to duplex outlet if previ-
ously turned off per the warning in step
1, page 9.
6. Check to make sure that the power cord is
completely clear of the blower wheel and
thattherearenootherforeignobjectsin
blower wheel. Turn blower on and check
for operation.
7. Replace bottom of rebox. Note: Make
surethebackofthereboxbottomslides
under the rear of the rebrick (lift the
rebrickupifnecessary.)
8. Reattachreboxbottomusing2screws
removed in step 1, page 9.
9. Install the log set heater according to the
installation instructions supplied with the
heater.
OPERATING THE BLOWER
Light your gas appliance with the blower off.
After about 15 minutes, turn the blower on
to deliver heated air at the top louvers. The
blower features a variable control which al-
lows you to select the speed you desire.
Note: Periodically check the louvers of the
rebox and remove any dust, dirt or other
obstructions.
INSTALLING LOG HEATER IN
FIREBOX
CAUTION: Do not pick up log
base assembly by burners. This
could damage burners. Only
handle base by grates.
CAUTION: Do not remove the
data plates attached to the heater
base assembly. The data plates
contain important warranty and
safety information.
1. Remove2screwsholdingreboxbottom
in place.
2. Liftandremovereboxbottom(seeFigure
9, page 9).
3. Route exible gas line from equipment
shutoffvalveintoreboxthroughside.
NOTICE: Most building codes do not
permit concealed gas connections.
A exible gas line is recommended
to allow accessibility from the re-
box. The exible gas supply line
connection to the equipment shut-
off valve should be accessible.
4. Attachgaslogheaterbasetoreboxbot-
tom with four screws included with base
(see Installing Heater Base Assembly in
log set owner’s manual).
5. Replacereboxbottomandsecurewith
screws.
INSTALLING FIREPLACE HOOD
NOTICE: The rebox canopy (hood)
must not be modied or replaced
with a canopy (hood) that may be
provided with the unvented decora-
tive room heater.
1. Attach three zinc-colored shoulder screws
to back of hood.
2. Insert hood into hood-mounting slots on
rebox.
3. Hold hood in place. Insert two black Phil-
lips screws through bottom of hood and
tighten.
Figure 12 - Installing Fireplace Hood
Hood Hood
Mounting
Slot
Screw
Shoulder
Screw