Desa HDFB32CA Original instructions

For more information, visit www.desatech.com
UNVENTED (VENT-FREE) UNIVERSAL FIREBOX
SAFETY INFORMATION AND INSTALLATION MANUAL
HDFB32CA
CIRCULATING LOUVERED MODEL
WARNING: If the information in this manual is not fol-
       

FOR USE ONLY WITH A LISTED GAS-FIRED UNVENTED
DECORATIVE ROOM HEATER NOT TO EXCEED 40,000

      


DO NOT INSTALL AN APPLIANCE IN THIS FIREBOX
UNLESS THIS FIREBOX MEETS THE MINIMUM DIMEN-

        
-

      




www.desatech.com 116533-01D2
SAFETY INFORMATION
TABLE OF CONTENTS
Safety Information ............................................... 2
Local Codes......................................................... 3
Unpacking............................................................ 3
Product Features................................................. 3
Product Specications......................................... 4
Locating Firebox ................................................. 4
Air For Combustion and Ventilation ..................... 4
Installation ........................................................... 7
Technical Service............................................... 12
Replacement Parts............................................ 12
Accessories ....................................................... 13
Illustrated Parts Breakdown and Parts List........ 14
Parts Centrals.................................................... 15
Warranty Information ...........................Back Cover
-
  
service or maintenance can

Refer to this manual for correct
  
   
additional information consult
   








IMPORTANT: Read this owner’s



-



   


-
    
-

WARNING: Do not allow fans



    
   

    



 
    




children and adults away


remain hot for a time after shut-
    

-
dren when they are in the room







www.desatech.com
116533-01D 3


   

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 top of
rebox - for side clearances see Figure
6, page 7
• 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 ventila-
tion to run properly. See Air for Combus-
tion 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 unit off and let cool before servicing.
Only a qualied service person should ser-
vice and repair rebox or installed unit.
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.
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).
SAFETY INFORMATION
Continued
*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
2 - 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.
PRODUCT FEATURES
OPERATION
This rebox 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 rebox requires no electricity mak-
ing 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 116533-01D4
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 7).
2. Everything needed to complete installation.
3. This model CANNOT be installed in a
bedroom or bathroom.
4. Proper air for combustion and ventilation
(see Air For Combustion and Ventilation).
AIR FOR COMBUSTION
AND VENTILATION

     
-
-





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.
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:
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
SPECIFICATIONS

www.desatech.com
116533-01D 5
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.

The air that leaks around doors and windows
may provide enough fresh air for combustion
and ventilation. However, in buildings of un-
usually tight construction, you must provide
additional fresh air.

construction where:
 -
    

-112
and
 
and
      
     


    


If your home meets all of the three criteria

See Ventilation Air From Outdoors
If your home does not meet all of the three
Determining Fresh-
Air Flow For Firebox Location, 

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 m3per 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 m3per kw) of the ag-
gregate 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 unconned space.
* Adjoining rooms are communicating only if
there are doorless passageways or ventilation
grills between them.
AIR FOR COMBUSTION
AND VENTILATION
Continued
DETERMINING FRESH-AIR FLOW
FOR HEATER LOCATION


Use this work sheet to determine if you have
a conned or unconned 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)
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)
40,000
39,000
79,000

www.desatech.com 116533-01D6
AIR FOR COMBUSTION
AND VENTILATION
Continued
The space in the previous 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 below .
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.
WARNING: If the area in
     
    
    
     
    



in the National Fuel Gas Code,
ANSI Z223.1/NFPA54 Section 5.3

VENTILATION AIR

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.
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 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"
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

www.desatech.com
116533-01D 7
INSTALLATION
NOTICE: This heater is intended
    


     -








 -


WARNING: Never install the

 
• in a recreational vehicle
• where curtains, furniture,
   

     


 
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 mate-
rial can be placed directly against any exterior
surface on the rear, sides or top of your rebox,
except where standoff spacers are integrally at-
tached. If standoff spacers are attached to your
rebox, these spacers can be placed directly
against wall or framing materials.
Use the dimensions shown for rough openings
to create the easiest installation (see Built-In
Firebox Installation, page 11).
INSTALLATION CLEARANCES
WARNING: Maintain the



Carefully follow the instructions below. This
will ensure safe installation.
Minimum Clearances For Side


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".
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 rebox,
you must meet the minimum allowable clear-
ance between mantel shelf and top of rebox
opening shown in Figure 7, page 8. These are
the minimum allowable mantel clearances
for a safe installation. Use larger clearances
wherever possible to minimize heating of
objects and materials placed on mantel.
CAUTION: Close screens
   




www.desatech.com 116533-01D8
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.
 

-


the National Electrical Code,
ANSI/NFPA 70 (Latest Edition)
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:      


    

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.
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
INSTALLATION
Continued
Figure 9 - Removing Screws from
Firebox Bottom
Screws
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.

www.desatech.com
116533-01D 9
INSTALLATION
Continued
WARNING: If there is a du-




-

Failure to do this may result in

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).
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.       
, determine whether
the power cord will exit the left side or
the right side of the rebox. Install 1
plastic bushing provided into the 1
1
/
2
"
hole in the oor support on the exit
side. Install the second plastic bushing
provided into the 1
1
/
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.      -
  , plug the
power cord into the duplex outlet
provided.
Figure 10 - Attaching Speed Control
Control Shaft
Speed
Control
Lock Nut
Control
Knob
CAUTION: Never touch the

5. Turn on power to duplex outlet if previ-
ously turned off per the warning in step
1, page 8.
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 8.
9. Install the log set heater according to the
installation instructions supplied with the
heater.
Figure 11 - Installing Plastic Bushing for
Power Cord
Plastic Bushing
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 allows 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 remove the





www.desatech.com 116533-01D10
INSTALLATION
Continued
1. Remove 2 screws holding rebox bottom
in place.
2. Lift and remove rebox bottom (see Figure
9, page 8).
3. Route exible gas line from equipment
shutoff valve into rebox through side.



-
     
-

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.
ASSEMBLING AND ATTACHING
OPTIONAL BRASS TRIM
Note: The instructions below show assem-
bling and attaching brass trim to replace.
1. Remove packaging from three pieces of
brass trim.
2. Locate four brass screws, two adjusting
plates with set screws and two shims in
the hardware packet.
3. Align shim under adjusting plate as shown
in Figure 12.
4. Slide one end of adjusting plate/shim in
slot on mitered edge of top brass trim (see
Figure 12).
5. Slide other end of adjusting plate/shim in
slot on mitered edge of side brass trim
(see Figure 12).
6. While rmly holding edges of brass trim
together, tighten both set screws on the
adjusting plate with slotted screwdriver.
7. Repeat steps 1 through 6 for the other
side.
8. Tighten trim hanging screws (#10 x 6.25
shoulder) into holes in cabinets. Place
the assembled trim onto replace cabinet.
Align hanging notches on trim with hang-
ing screws on side of replace (see Figure
13). Push trim rmly into place, sliding
hanging notches over hanging screws.
Figure 12 - Assembling Brass Trim
Slot
Mitered Edge
Slot
Shim
Set
Screws
Adjusting
Plate
Side Brass
Trim
Top Brass Trim
Figure 13 - Attaching Brass Trim to
Fireplace
Trim
Hanging
Screws
Assembled
Brass Trim
Hanging
Notches
on Trim
INSTALLING FIREPLACE HOOD

     

-

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.