Desa Tech GFP28MNG, GFP28TNG Owner's Manual
UNVENTED (VENT-FREE)
NATURAL GAS FIREPLACE
This appliance 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
OWNER’S OPERATION AND INSTALLATION MANUAL
GFP28MNG
AND
GFP28TNG
Shown with optional
®
cabinet mantel and
hearth 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.
— 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.
Save this manual for future reference.
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: This is an unvented
gas-fired heater. It uses air (oxygen) from the room in which it is
installed. Provisions for adequate
combustion and ventilation air
must be provided. Refer to
Combustion and Ventilation
tion in this manual.
Air for
sec-
CONTENTS
SECTION PAGE
Safety Information................................................................................... 2
Product Identification .............................................................................. 4
Local Codes ............................................................................................. 5
Unpacking................................................................................................ 5
Product Features ...................................................................................... 5
Air for Combustion and Ventilation........................................................ 6
Installing .................................................................................................. 9
Check Gas Type ............................................................................... 9
Assembling and Attaching Brass Trim ............................................ 10
Installation Clearances ..................................................................... 11
Conventional Fireplace Installation ................................................. 11
Built-In Fireplace Installation .......................................................... 14
Installing Gas Piping to Fireplace Location ..................................... 16
Connecting Fireplace to Gas Supply ................................................ 17
Checking Gas Connections .............................................................. 18
Installing Logs.................................................................................. 20
Operating Fireplace (Thermostat-Controlled Model) ............................. 21
Operating Fireplace (Manually Controlled Model)................................. 24
Inspecting Burners................................................................................... 28
Cleaning and Maintenance ...................................................................... 28
Troubleshooting....................................................................................... 28
Service Hints ........................................................................................... 38
Specifications .......................................................................................... 38
Wiring Diagram....................................................................................... 38
Technical Service .................................................................................... 38
Illustrated Parts Lists ............................................................................... 32-37
Replacement Parts ................................................................................... 39
Accessories .............................................................................................. 39
Warranty Information .............................................................................. Back Cover
SAFETY
INFORMATION
2
W ARNINGS
WARNING ICON G 001
IMPORTANT: Read this owner’s manual carefully and completely before
trying to assemble, operate, or service this fireplace. Improper use of this
fireplace can cause serious injury or death from burns, fire, explosion,
electrical shock, and carbon monoxide poisoning.
DANGER
WARNING ICON G 001
Carbon monoxide poisoning may lead to death!
Carbon Monoxide Poisoning: Early signs of carbon monoxide poisoning resemble
the flu, with headaches, dizziness, or nausea. If you have these signs, the fireplace may
not be working properly. Get fresh air at once! Have fireplace serviced. Some people
are more affected by carbon monoxide than others. These include pregnant women,
people with heart or lung disease or anemia, those under the influence of alcohol, and
those at high altitudes.
Natural Gas: Natural gas is odorless. An odor-making agent is added to the gas. The
odor helps you detect a gas leak. However, the odor added to the gas can fade. Gas may
be present even though no odor exists.
Make certain you read and understand all Warnings. Keep this manual for reference. It
is your guide to safe and proper operation of this fireplace.
Safety Information continues on next page
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SAFETY
INFORMATION
Continued
W ARNINGS
WARNING: Any change to this fireplace or its controls can be dangerous.
1. This appliance is only for use with the type of gas indicated on the rating plate. This
appliance is not convertible for use with other gases.
2. If you smell gas
• shut off gas supply
• 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
3. This fireplace shall not be installed in a bedroom or bathroom.
4. Never install the fireplace
• 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 fireplace
• in high traffic areas
• in windy or drafty areas
5. Do not use this fireplace as a wood-burning fireplace. Use only the logs provided with
the fireplace.
6. Do not add extra logs or ornaments such as pine cones, vermiculite, or rock wool.
Using these added items can cause sooting. Do not add lava rock around base. Rock
and debris could fall into the control area of fireplace.
7. You must operate this fireplace with the fireplace screen in place. Make sure fireplace
screen is in place before running fireplace.
8. This fireplace is designed to be smokeless. If logs ever appear to smoke, turn off
fireplace and call a qualified service person.
smoking could occur due to log curing and fireplace burning manufacturing residues.
9. Do not allow fans to blow directly into the fireplace. Avoid any drafts that alter burner
flame patterns. Ceiling fans can create drafts that alter burner flame patterns. Altered
burner patterns can cause sooting.
10. Do not use a blower insert, heat exchanger insert or other accessory not approved for
use with this heater.
11. This fireplace needs fresh air ventilation to run properly. This fireplace has an oxygen
depletion sensor (ODS) pilot light safety system. The ODS shuts down the fireplace if
not enough fresh air is available. See Air for Combustion and Ventilation, pages 6
through 8. If fireplace keeps shutting off, see Troubleshooting, pages 28 through 31.
12. Do not run fireplace
• where flammable liquids or vapors are used or stored
• under dusty conditions
13. Do not use this fireplace to cook food or burn paper or other objects.
14. Never place any objects in the fireplace or on logs.
15. Fireplace front and screen becomes very hot when running fireplace. Keep children
and adults away from hot surfaces to avoid burns or clothing ignition. Fireplace will
remain hot for a time after shut-down. Allow surfaces to cool before touching.
16. Carefully supervise young children when they are in the room with fireplace.
17. Do not use fireplace if any part has been exposed to or under water. Immediately call a
qualified service technician to inspect the fireplace and to replace any part of the
control system and any gas control which has been under water.
18. Do not operate fireplace if any log is broken. Do not operate fireplace if a log is
chipped (dime-sized or larger).
19. Turn fireplace off and let cool before servicing. Only a qualified service person should
service and repair fireplace.
20. Operating fireplace above elevations of 4,500 feet could cause pilot outage.
Continued
Note:
During initial operation, slight
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3
PRODUCT
IDENTIFICATION
Front
Burner
Front Log (#1)
Rear Log (#2)
Left Front
Branch
(#4)
Base
Right Front
Branch
(#5)
Top Louvered
Hood
Rear Burner
Gas
Regulator
Figure 1 - Log Base Assembly
Top Outer
Casing
Firebox
Support
Rear
Access
Door
Screen
Assembly
Bottom Louver
Assembly
4
Figure 2 - Fireplace
Side
Access
Door
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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 ANSI Z223, also
known as NFPA 54*.
*Available from:
American National Standards Institute, Inc.
1430 Broadway
New York, NY 10018
National Fire Protection Association, Inc.
Batterymarch Park
Quincy, MA 02269
UNPACKING
PRODUCT
FEATURES
1. Place the carton containing the fireplace unit on its back. Hold fireplace and
pull the carton and pallet away. Remove trim kit from front of fireplace.
2. Locate two screws above top corners of the fireplace screen. Remove and
discard these screws. Lift fireplace screen up and pull out to remove.
3. Remove protective packaging applied to logs, log base assembly, and fireplace.
4. Check all items for any shipping damage. If damaged, promptly inform dealer
where you bought fireplace.
Operation
This vent-free fireplace is clean burning. It requires no outside venting. There is no
heat loss out a vent or up a chimney. Heat is generated by both realistic flames and
glowing embers. When used without the blower, the fireplace requires no electricity
making it ideal for emergency back-up heat.
Safety Features
This fireplace has a pilot with an Oxygen Depletion Sensor Shutoff System
(ODS). The ODS/pilot is a required feature for vent-free room heaters. The ODS
system protects against oxygen depletion and any interruption in the fuel supply. If
either occurs, the ODS shuts off gas flow to the burner, turning the fireplace off.
An internal regulator controls fluctuations in your gas pressure.
Piezo Ignition System
This fireplace has a piezo ignitor. This system requires no matches, batteries, or
other sources to light fireplace.
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Thermostat Control (GFP28TNG)
These fireplaces have a thermostat sensing bulb and a control valve. The thermostat controls the heat output and flame height. This maintains a consistent room
temperature. Even the lowest setting provides realistic flames and glowing embers
from two burners. Selecting higher comfort settings allows the fireplace to run
longer, producing greater heat output. At lower comfort settings, the fireplace will
run less. This results in increased heating comfort. This can also result in lower
gas bills.
Blower Assembly (GFP28TNG)
This fireplace has a blower assembly. The blower operates thermostatically. The
blower circulates heated air from the fireplace into the room. Use of blower is
optional.
Variable Manual Control (GFP28MNG)
These fireplaces have a variable manual control valve which allows the user to
choose the heat setting that best suits his needs. Any setting between low and high
may be selected by simply turning the control knob.
5
AIR FOR
W ARNING
COMBUSTION
AND
VENTILATION
This heater 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, fireplaces, 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 is exerpts from National Fuel Gas Code. NFPA 54/ANSI 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 6 through 8 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 continu-
ous water vapor retarder with a rating of one perm or less with open-
ings 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
If your home does not meet all of the three criteria above, proceed to page 6.
Ventilation Air From Outdoors
and
, page 7
and
.
Unconfined Space
The National Fuel Gas Code, ANSIZ223.1, 1992, Section 5.3 defines uncon-
fined space as having a minimum air volume of 50 cubic feet (127 cubic cm) for
each 1000 Btu/Hr input rating of all appliances in the space (cubic feet equals
length x width x height of space). Include adjoining rooms only if there are
doorless passageways or ventilation grills between the rooms.
Confined Space
The National Fuel Gas Code, ANSIZ223.1, 1992, Section 5.3 defines confined
space as having an air volume of less than 50 cubic feet (127 cubic cm) for each
1000 Btu/Hr input rating of all appliances in the space (cubic feet equals length
x width x height of space). Include adjoining rooms only if there are doorless
6
passageways or ventilation grills between the rooms.
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AIR FOR
COMBUSTION
DETERMINING AIR FLOW FOR FIREPLACE LOCATION
Determining if You Have a Confined or Unconfined Space
Use this work sheet to determine if you have a confined or unconfined space.
AND
VENTILATION
Continued
Space: Includes the room in which you will install fireplace 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.
Example:
* 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 pro-
vides an unconfined space, remove door to adjoining room or add ventilation grills
between rooms. See Ventilation Air from Inside Building, page 8.
B. Vent room directly to the outdoors. See Ventilation Air from Outdoors, page 8.
C. Install a lower Btu/Hr fireplace, 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)
Vent-free fireplace ___________________ 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
Gas water heater 40,000 Btu/Hr
Vent-free fireplace + 28,000 Btu/Hr
Total = 68,000 Btu/Hr
63,300 Btu/Hr (maximum the space can support)
68,000 Btu/Hr (actual amount of Btu/Hr used)
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Continued
7
AIR FOR
Or
Remove
Door into
Adjoining
Room,
Option
3
Ventilation Grills
Into Adjoining Room,
Option 2
Ventilation
Grills
Into Adjoining
Room,
Option 1
12"
12"
COMBUSTION
AND
VENTILATION
Continued
WARNING
If the area in which the heater may be operated is smaller than
that defined as an unconfined space, provide adequate combustion and ventilation air by one of the methods described in the
National Fuel Gas Code, ANSI Z223.1, 1992, Section 5.3.
VENTILATION AIR
Ventilation Air From Inside Building
This fresh air would come from an adjoining unconfined space. When ventilating to an
adjoining unconfined space, you must provide two permanent openings: one within 12" of the
ceiling and one within 12" of the floor on the wall connecting the two spaces (see options 1
and 2, Figure 3). You can also remove door into adjoining room (see option 3, Figure 3).
Follow the National Fuel Gas Code NFPA 54/ANSI Z223.1, Section 5.3, Air for Combustion
and Ventilation for required size of ventilation grills or ducts.
W ARNING
Rework worksheet, adding the space of the adjoining unconfined
space.
appliances in both spaces.
The combined spaces must have enough fresh air to supply all
8
Figure 3 - Ventilation Air from Inside Building
Ventilation Air From Outdoors
Provide extra fresh air by using ventilation grills or ducts. You must provide two permanent openings: one within 12" of the ceiling and one within 12" of the floor. Connect
these items directly to the outdoors or spaces open to the outdoors. These spaces include
attics and crawl spaces.
IMPORTANT:
thermostat-controlled power vent. Heated air entering the attic will activate the power
vent.
Do not provide openings for inlet or outlet air into attic if attic has a
Ventilated
Attic
Crawl Space
Ventilated
To Attic
To
Crawl
Space
Outlet
Air
Inlet
Air
Outlet
Air
Inlet Air
Figure 4 - Ventilation Air from Outdoors
103090
INSTALLING
NOTICE
A qualified service person must install fireplace. Follow all local
codes.
WARNING
Never install the fireplace
• in a bedroom or bathroom
• 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 fireplace
• in high traffic areas
• in windy or drafty areas
WARNING
The GFP28TNG has a three-prong, grounded electrical plug.
This plug helps protect you against electrical shock. Only connect plug to a properly grounded, three-prong receptacle. Do
not cut or remove the grounding prong from this plug.
CAUTION
This fireplace creates warm air currents. These currents move heat
to wall surfaces next to fireplace. Installing fireplace next to vinyl or
cloth wall coverings or operating fireplace where impurities in the
air (such as tobacco smoke) exist, may discolor walls.
IMPORTANT:
installing fireplace in rooms without enough ventilation air may cause mildew to
form from too much moisture. See Air for Combustion and Ventilation, pages 6
through 8.
IMPORTANT:
not work properly.
CHECK GAS TYPE
Use only natural gas. If your gas supply is not natural gas, do not install fireplace.
Call dealer where you bought fireplace for proper type fireplace.
ELECTRICAL HOOKUP
The GFP28TNG has a blower assembly with an electrical cord. The electrical cord is
five feet in length. You must locate fireplace within reach of a 120 volt grounded
electrical outlet. If not, you must install an electrical outlet within reach of fireplace power cord.
Vent-free heaters add moisture to the air. Although this is beneficial,
Make sure the fireplace is level. If fireplace is not level, log set will
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Continued
9
INSTALLING
Continued
ASSEMBLING AND ATTACHING BRASS TRIM
Note:
1. Remove packaging from three pieces of brass trim.
2. Locate four brass screws, two adjusting plates with set screws, and two shims
3. Align shim under adjusting plate as shown in Figure 5.
4. Slide one end of adjusting plate/shim in slot on mitered edge of top brass trim
5. Slide other end of adjusting plate/shim in slot on mitered edge of side brass
6. While firmly holding edges of brass trim together, tighten both set screws on
7. Repeat steps 1 through 6 for other side.
The instructions below show assembling and attaching brass trim to fireplace.
Do not yet install trim if performing a built-in installation (see page 14, Built-
In Fireplace Installation).
in the hardware packet.
(see Figure 5).
trim (see Figure 5).
the adjusting plate with slotted screwdriver.
Side Brass Trim
Figure 5 - Assembling Brass Trim
Set Screws
Adjusting
Plate
Shim
Slot
Mitered Edge
Slot
Top Brass Trim
8. Tighten trim hanging screws (#10 x 6.25 shoulder) into holes in cabinets.
Place the assembled trim onto fireplace cabinet. Align hanging notches on
trim with hanging screws on side of fireplace (see Figure 6). Push trim firmly
into place, sliding hanging notches over hanging screws.
Trim Hanging
Screws
Assembled
Brass Trim
10
Hanging
Notches on
Trim
Figure 6 - Attaching Brass Trim to Fireplace
103090
INSTALLING
INSTALLATION CLEARANCES
Continued
W ARNING
Maintain the minimum clearances. If you can, provide greater
clearances from floor, ceiling, and adjoining wall.
Carefully follow the instructions below. This will ensure safe installation.
Minimum Wall and Ceiling Clearances (see Figure 7)
A. Clearances from the side of the fireplace opening to any combustible wall should
not be less than 16 inches for a cabinet mantel or 12 inches for a corner installation.
B. Clearances from the top of the fireplace opening to the ceiling should not be
less than 42 inches.
MINIMUM CLEARANCE
Note: Clearances
are the same if
using optional
cabinet mantel or
built-in installation.
16"
Side Wall - 16 "
42"
Ceiling - 42"
Floor - 0"
Figure 7 - Minimum Clearance to Wall and Ceiling
CONVENTIONAL FIREPLACE INSTALLATION
Conventional installation of this fireplace involves installing fireplace along with
the cabinet mantel and hearth base accessory against a wall in your home. Follow
the instructions below to install the fireplace in this manner.
WARNING
For conventional installation, it is recommended you use the
cabinet mantel or hearth bases specified in this manual. Surface
clearances may not be sufficient with other cabinet mantels and
hearth bases. This may create a fire hazard. See
page 39 for correct mantels and hearth bases.
Note:
The instructions below show installation using the GM28MU cabinet mantel
and the GFP28HBU hearth base accessory. The hearth base accessory shown is
optional for this installation. You can install fireplace and cabinet mantel directly
on the floor.
1. Assemble cabinet mantel and hearth base. Assembly instructions are included
with each accessory.
Accessories,
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Continued
11
INSTALLING
Continued
2. Break off nailing flanges (see Figure 8) with hammer or pliers.
3. Place mantel and base in desired location. Place heater in front opening of
mantel. Make sure all pieces fit properly. Remove mantel.
4. Mark floor and base or wall for gas line entrance. Make sure there is enough
clearance between heater and mantel for gas line. IMPORTANT: Make sure
there are no electrical lines where gas piping will go through floor or wall.
5. Cut an access hole in hearth base top to run flexible gas line to fireplace (see
Figure 9). Make sure to locate access hole so cabinet mantel will cover it when
installed.
Note:
You can secure base to floor using wood screws. Countersink
screw heads and putty over.
Nailing Flanges
Figure 8 - Location of Nailing Flanges
6. Install gas piping to fireplace location. This installation includes an approved
flexible gas line (if allowed by local codes) after the manual shutoff valve. The
flexible gas line must be the last item installed on the gas piping. See Installing
Gas Piping to Fireplace Location, page 16.
Hearth Base
Figure 9 - Placing Hearth Base Accessory Against Wall
Flexible Gas Line
Electrical Outlet
Gas Line Access
Hole
12
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