Desa Tech FB36CB, FB36NCA, FB42CA, FB42NC Owner's Manual
®
UNVENTED (VENT-FREE)
LogMate™ UNIVERSAL FIREBOX
OWNER’S OPERATION AND INSTALLATION MANUAL
®
FB36NCA and FB42NC
Non-circulating Models
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.
• 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.
— Installation and service must be performed by a
qualified installer, service agency, or the gas supplier.
FB36CB and FB42CA
Circulating Models
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
decorative type unvented room
heaters. Do not build a wood fire.
This firebox has been tested and
approved by I.A.S. under their
REQ. 2-97 for use with any ANS
Z21.11.2 approved gas logs.
This firebox may be installed in an aftermarket* manufactured (mobile) home, where not prohibited by
state or local codes.
* Aftermarket: Completion of sale, not for purpose of resale, from the manufacturer (i.e. Installation of this product is permitted after the manufactured (mobile) home is sited).
Save this manual for future reference.
VANGUARD
UNVENTED (VENT-FREE) LOGMATE™ FIREBOX
SAFETY
INFORMATION
WARNINGS
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.
CAUTION: Carefully review
the instructions supplied with the
decorative type unvented room
heater for the minimum fireplace
size requirement. Do not install
the appliance in this firebox unless this firebox meets the minimum dimensions required for the
installation.
WARNING: Any change to
this firebox or its controls can be
dangerous.
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 36 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. Y ou must operate this fireplace with the
provided fireplace screen, hood, and
brick liner in place. Make sure these
parts are in place and screens are closed
before running firebox. The supplied
hood may not be replaced with a hood
which may be provided with a log
heater.
6. 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.
7. Do not use a blower insert, heat exchanger insert or other accessory not
approved for use with this heater. Do
not use blower accessory with Models
FB36NCA or FB42NC. Use only the
provided hood, or appropriate polished
brass hood accessory. See Accessories
on page 18.
8. Vent-free gas log heaters installed in
these fireboxes require fresh air ventilation to run properly. See Air for Com-
bustion and Ventilation, pages 5
through 7.
9. Do not run firebox
• where flammable liquids or vapors
are used or stored
• under dusty conditions
10. Do not use this firebox to cook food or
burn paper or other objects.
11. Never place any objects in the firebox
or on logs.
12. Firebox front and screen becomes 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
shut-down. Allow surfaces to cool before touching.
13. Carefully supervise young children
when they are in the room with firebox.
14. Turn firebox off and let cool before
servicing. Only a qualified service person should service and repair firebox.
15. Operating firebox above elevations of
4,500 feet could cause pilot outage.
16. 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.
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104654
OWNER’S MANUAL
LOCAL CODES
Install and use fireplace with care. Follow all
local codes. In the absence of local codes, use
the latest edition of The National Fuel Gas
Code ANS Z223.1, also known as NFPA 54*.
Firebox must be electrically grounded in
accordance with the National Electrical Code,
ANS/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
UNPACKING
1. Use utility knife to cut carton all the
way around above the staples on the
bottom tray. Lift carton off the firebox
and discard.
2. Remove all protective packaging from
inside firebox. Carefully lift the firebox off the bottom corrugated tray.
3. Check carton contents for the
following:
• Screen assembly
• Screen support rod
• Hardware and parts bag containing
the following:
- Owners Operation and Installation
Manual
- 2 - Black #10 x 3/8" Phillips
screws for mounting screen
support rods
If any items are missing, inform dealer
where you bought firebox.
4. Check all items for any shipping damage. If damaged, promptly inform
dealer where you bought firebox.
PRODUCT
FEATURES
Operation
This firebox is designed for use with approved ANS 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. When
used without the blower (models FB36CB or
FB42CA only), the firebox requires no electricity making it ideal for emergency backup heat.
Blower Accessory
The FB36CB or FB42CA fireboxes will
accept the GA3700 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.
Brick Liner
This firebox features concrete brick liner.
As with all concrete liners, this liner may
develop slight cracks when exposed to heat.
These cracks will not affect the performance of the fireplace or vent-free gas logs.
LOCA TING
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 or bathroom.
4. Proper air for combustion and ventilation (page 5).
Notice: The firebox identification
label (including model number,
serial number, clearances, etc.)
is located either on the left front
edge of the firebox or behind the
left side firebrick panel. See Figure 15, page 11.
104654
3
VANGUARD
UNVENTED (VENT-FREE) LOGMATE™ FIREBOX
PRODUCT
SPECIFICATIONS
Standoffs
Built-in Nailing
Flanges
Louvers
(Models FB36CB
and FB42CA only)
Figure 1 - Firebox Front View
Standoffs
2 3/4"
1 1/2"
41 11/16" (36" models) • 47 11/16" (42" models)
19 3/8"
36" (36" models) • 42" (42" models)
29 1/8" (36" Models) • 35 1/8" (42" Models)
22 3/4" (36" Models) •
28 3/4" (42" Models)*
2 5/8"
35"
15 7/8"
2 5/8"
6 5/8"
8 7/16"
Electrical Access
Hole (for use
when using
blower power
cord with external
electrical outlet.
See Blower Kit
Instructions)
Diameter Holes
Figure 2 - Firebox Side View
14 1/4"
19 1/2"
22 1/4"
Gas Line Access
Hole (either side)
6 7/8"
1 1/2"
9 5/8"
3 1/2"
10 3/4"
13 9/16"
Figure 3 - Firebox Top View
Electrical Access Hole
Strain relief fitting for electrical cable when hard
wiring firebox for built-in installations (strain relief
fitting included on circulating models only)
5/8"
30 3/8" (36" Models) • 36 7/8" (42" Models)
34" (36" Models) • 40" (42" Models)*
36" (36" Models) • 42" (42" Models)
41" (36" Models) • 47" (42" Models)
42 3/8" (36" Models) • 48 3/8" (42" Models)
*Interior Dimensions Within Brick Liner
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104654
OWNER’S MANUAL
AIR FOR
COMBUSTION AND
VENTILATION
WARNING: This firebox shall
not be installed in a confined
space 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.
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-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 fuelburning appliances.
PROVIDING ADEQUATE
VENTILATION
The following is exerpts from National Fuel
Gas Code. NFPA 54/ANS Z223.1, Section
5.3, Air for Combustion and Ventilation.
All spaces in homes fall into one of the three
following ventilation classifications:
1. Unusually Tight Contruction
2. Unconfined Space
3. Confined Space
The information on pages 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
per pa-sec-m2) or less with openings gasketed or sealed
b. weather stripping has been
added on openable windows and
doors
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
From Outdoors
If your home does not meet all of the
three criteria above, proceed to
and
Ventilation Air
, page 7.
mining Fresh-Air Flow for Firebox
Location,
page 6.
-11
and
Deter-
kg
Confined and Unconfined Space
The National Fuel Gas Code (ANS Z223.1,
1992 Section 5.3) 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 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.
This heater shall not be installed in a confined space or unusually tight construction
unless provisions are provided for adequate
combustion and ventilation air.
* Adjoining rooms are communicating only
if there are doorless passageways or ventilation grills between them.
104654
Continued
5
VANGUARD
UNVENTED (VENT-FREE) LOGMATE™ FIREBOX
AIR FOR
COMBUSTION AND
VENTILATION
Continued
DETERMINING FRESH-AIR FLOW FOR FIREBOX 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 firebox 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:
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. Divide the space volume by 50 cubic feet to determine the maximum Btu/Hr the space can support.
_____________ (volume of space) ÷ 50 cu. ft. = (Maximum Btu/Hr the space can support)
Example:
3. Add the Btu/Hr of all fuel burning appliances in the space.
Vent-free firebox _______________ Btu/Hr
Gas water heater* _______________ Btu/Hr
Gas furnace _______________ Btu/Hr
Vented gas heater _______________ Btu/Hr
Gas firebox 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.
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:
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 work sheet, adding the space of an adjoining room. If the extra space provides an unconfined space, remove door to adjoin-
ing 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 firebox, 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.
Space size 22 ft. (length) x 18 ft. (width) x 8 ft. (ceiling height) = 3168 cu. ft. (volume of space)
3168 cu. ft. (volume of space) ÷ 50 cu. ft. = 63.3 or 63,300 (maximum Btu/Hr the space can support)
Example:
Gas water heater 40,000 Btu/Hr
Vent-free firebox
with log heater + 39,000 Btu/Hr
Total = 79,000 Btu/Hr
63,300 Btu/Hr (maximum the space can support)
79,000 Btu/Hr (actual amount of Btu/Hr used)
WARNING: If the area in which the firebox and gas log heater may be operated is smaller than that defined as
an unconfined space or if the building is of unusually tight construction, provide adequate combustion and
ventillation air by one of the methods described in the
applicable local codes.
National Fuel Gas Code, ANS Z223.1, 1992, Section 5.3
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104654
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