Desa VFRMV24NA User Manual

UNVENTED (VENT FREE)

GAS LOG HEATER

OWNER’S OPERATION AND

INSTALLATION MANUAL

ANSI Z21.11.2a-2003

ANSI Z21.60-2003

CSA 2.26-2003

APPROVED

For more information, visit www.desatech.com

VFRMV18NA, VFRMV18PA
VFRMV24NA, VFRMV24PA

Ve n t -f re e Mo de ls A l s o D e s i gn -- Ce rt if ie d A s Ve nt ed D ec or at iv e A p p l i a n c es

WARNING: If the information in this manual
is not followed exactly, a fire or explosion
may result causing property damage, per
sonal injury, or loss of life.

-

WARNING: Improper installation, ad­justment, alteration, service, or main­tenance can cause injury or property
damage. Refer to this manual for
correct installation and operational

— 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

procedures. For assistance or addi­tional information consult a qualified
installer, service agency, or the gas
supplier.

• 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.

WARNING: This appliance is for instal­lation only in a solid-fuel burning masonry
or UL127 factory-built fireplace, or in an
approved vent less firebox. It is design­certified for these installations in accor
dance with ANSI Z21.11.2. Exception: do
not install this appliance in a factory-built
fireplace that includes instructions stating
it has not been tested or should not be
used with unvented logs.

-

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 Air for combustion and Ventilation section on page 4 of this manual.

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

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.

Warning: This product must be installed by a Licensed Plumber or Gas Fitter when installed
within The Commonwealth of Massachusetts.

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

Save this manual for future reference.

WARNING ICON G 001

TABLE OF CONTENTS

2

SAFETY INFORMATION

TABLE OF CONTENTS

SAFETY INFORMATION .............................................................. 2

PRODUCT IDENTIFICATION ......................................................

OPTIONAL REMOTE CONTROL ACCESSORIES ......................

LOCAL CODES ............................................................................

UNPACKING ................................................................................

PRODUCT FEATURES ................................................................

AIR FOR COMBUSTION AND VENTILATION .............................

INSTALLATION ............................................................................

OPERATING HEATER ...............................................................

3

4

4

4

4

4

7

14

INSPECTING BURNERS ...........................................................17

SAFETY INFORMATION

WARNINGS

IMPORTANT: Read this owner’s manual carefully and com­pletely before trying to assemble, operate, or service this log
set. Improper use of this log set can cause serious injury or
death from burns, fire, explosion, electrical shock, and carbon
monoxide poisoning.

DANGER: 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 log set may not be working properly. Get fresh air at once! Have
log set 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 & LP Gas : Natural & LP gas are 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 log set.

WARNING: Any change to this log set or its controls can be

dangerous.

WARNING: Do not use a blower insert, heat exchanger insert,

or other accessory not approved for use with this appliance.

CLEANING AND MAINTENANCE ..............................................

18

TROUBLESHOOTING ...............................................................19

SPECIFICATIONS ......................................................................

22

WIRING DIAGRAM ....................................................................23

SERVICE HINTS ........................................................................

TECHNICAL SERVICE ..............................................................

REPLACEMENT PARTS ............................................................

ILLUSTRATED BREAKDOWN AND PARTS LIST .....................

23

23

23

25

ACCESSORIES .........................................................................27

WARRANTY INFORMATION ......................................

Back Cover

WARNING: 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.

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

Do not place clothing or other flammable material on or near the
appliance. Never place any objects on the heater.

Heater assembly becomes very hot when running heater. Keep
children and adults away from hot surface to avoid burns or cloth
ing ignition. Heater will remain hot for a time after shutdown. Allow
surface to cool before touching.

Carefully supervise young children when they are in the room with
appliance. When using the hand-held remote accessory (Remote­Ready Models Only), keep selector switch in the OFF position to
prevent children from turning on burners with remote.

You must operate this heater with a fireplace screen in place. Make
sure fireplace screen is closed before running heater.

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

WARNING: Do not place log scraps or lava rocks on
burner

Solid fuels shall not be burned in a fireplace in with an unvented
room heater installed

-

WARNING: This appliance is equipped with (natural or propane)

gas. Field conversion is not permitted.

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Children and adults should be alerted to the hazard of high
temperature and should stay away to avoid burns or clothing
ignition.

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SAFETY INFORMATION

Continued

1. This appliance, as supplied, 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. Do not place propane/LP supply tank(s) inside the structure.

Locate propane/LP supply tank(s) outdoors (propane/LP units only).

3. 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

4. This heater shall not be installed in a bedroom or bathroom, unless
installed as a vented appliance. See Installing Damper Clamp Acces

sory for Vented Operation

5. Before installing in a solid fuel burning fireplace, the chimney flue and
firebox must be cleaned of soot, creosote, ashes and loose paint by a
qualified chimney cleaner. Creosote will ignite if highly heated. Inspect
chimney flue for damage. If damaged, repair flue before operating ap
pliance.

6. If fireplace has glass doors, never operate with glass doors closed, If
you operate heater with doors closed, heat buildup inside fireplace will
cause glass to burst. Also if fireplace opening has vents at the bottom,
you must open the vents before operating heater.

7. To prevent the creation of soot, follow the instructions in cleaning and
maintenance, page 18.

8. Before using furniture polish, wax, carpet cleaner, or similar products,
turn heater off. If heated, the vapors from these products may create
a white powder residue within the burner box or on adjacent walls and
furniture.

9. This heater needs fresh, outside air ventilation to run properly this heater
has an Oxygen Depletion Sensing (ODS) safety shutoff system. The
ODS shuts down the heater if enough fresh air is not available. See
Air Combustion and Ventilation pages 4 through 6. If the heater keeps
shutting off, see Trouble shooting, pages 19 through 21.

10. Do not run heater

• where flammable liquids or vapors are used or stored

• under dusty conditions

11. Do not use heater to cook food or burn paper or other objects.

12. Do not use heater if any part has been exposed to or under water. Im

mediately call a qualified service technician to inspect the room heater
and to replace any part of the control system and any gas control which
has been under water.

13. Do not operate heater if any log is broken. Do not operate heater if a
log is chipped (dime-size or larger).

14. Turn heater off and let cool before servicing, installing, or repair-

, page 10.

SAFETY INFORMATION

PRODUCT IDENTIFICATION

ing. Make sure the selector switch is in the OFF position (Remote­Ready Models Only). Only a qualified service person should install,
service, or repair heater.

15. Make sure the selector switch is in the OFF position when you are away
from home for long periods of time (Remot-Ready Models Only).

16. Remote-ready heaters shall not be connected to any external electri­cal source.

17. Operating heater above elevations of 4,500 feet may cause pilot out­age.

18. To prevent performance problems, do not use propane/LP tank(s) of
less than 10 lb. capacity (propane/LP units only).

19. Provide adequate clearances around air openings.

-

WARNING: Failure to position the parts in accordance with these

diagrams or failure to use only parts specifically approved with
this heater may result in property damage, or personal injury.

LOCAL CODES

-

Install and use appliance 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*.

*Available from:

American National Standards Institute, Inc.

1430 Broadway

New York, NY 10018

National Fire Protection Association, Inc.

Battery march Park

Quincy, MA 02269

PRODUCT IDENTIFICATION

Log Set

-

Chassis Assembly

Figure 1 - Product Identification

Lava Rock

3

3

114745-01

114745-01

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OPTIONAL REMOTE CONTROL ACCESSORIES
LOCAL CODES

4

UNPACKING
PRODUCT FEATURES
AIR FOR COMBUSTION AND VENTILATION

PROVIDING ADEQUATE VENTILATION

OPTIONAL REMOTE CONTROL
ACCESSORIES

There are four optional remote controls that can be purchased sepa­rately for Remote-Ready Models Only:

Wall switch Hand-held ON/OFF remote

Wall thermostat Hand-held thermostat remote

See Accessories, page 27

The wall thermostat or hand-held thermostat may not be used where vented
decorative listings is required.

LOCAL CODES

Install and use the heater wit care. Follow all local codes. In the absence
of local codes, use the latest edition of

Z223.1/NFPA 54*

*Available from:

American National Standards Institute, Inc.

1430 Broadway

New York, NY 10018

National Fire Protection Association, Inc.

Battery march park

Quincy, MA 02269

Note:

Where listed vented decorative logs are required, thermostat operations
is not permitted.The installation of appliances designed for manufactured
home (U.S. only) or mobile home installation must conform with the Standard
CAN/CSA z240 MH, Standard, Title 24 CFR, Part 3280, in the United States,
or when such a Standard is not applicable, ANSI/NCSBCS A225.1/NFPA
501A Manufactured Home Installations Standard.

The National Fuel Gas Code ANSI

UNPACKING

CAUTION: Do not remove the data plates from the grate as-

sembly. The data plates contain important warranty and safety
information.

1. Remove log set assembly from carton. Note: Do not pick up assembly by

logs. This could damage the unit. Always handle assembly by grate.

2. Remove all protective packaging applied to log set for shipment.

3. Check all items for any shipping damage. If damaged, promptly inform

dealer where you bought appliance.

PRODUCT FEATURES

OPERATION
This heater is clean burning. It requires no outside venting. There is no heat
loss out a vent or up a chimeney. Heat is generated by both realistic flames
and glowing coals. This heater is designed for vent-free operation with flue
damper closed. It has been tested and approved to ANSI Z21.11.2 standard
for unvented heaters. State and local codes in some areas prohibit the use
of vent-free heaters. This heater may also be operated as a vented decora
tive (ANSI Z21.60) product by opening the flue damper (Non-Thermosta
models only).

SAFETY DEVICE

This heater has a pilot with an Oxygen Depletion Sensing (ODS) safety shut
off system. The ODS/pilot is a required feature for vent-free room heaters.
The ODS/pilot shuts off the heater if there is not enough fresh air.

PIEZO IGNITION SYSTEM

This heater has a piezo ignitor. This system requires no matches, batteries,
or other sources to light heater.

AIR FOR COMBUSTION AND
VENTILATION

WARNING: This heater shall not be installed in confined
space or unusually tight construction unless provisions are provided
for adequate combustion and ventilation air. Read the following in
structions 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 ap
pliances. 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 classifica­tions:

1. Unusually Tight Construction

2. Unconfined Space

3. Confined 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 combustion and ventilation. However, in buildings of unusually tight

construction, you must provide additional fresh air.

-

-

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114745-01

AIR FOR COMBUSTION AND
VENTILATION

Continued

Unusually tight construction is defined as construction where:

A.Walls and ceilings exposed to the outside atmosphere have a con
tinuous water vapor retarder with a rating of one perm (6 x 10
pa-sec-m

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 ad
ditional fresh air. See Ventilation Air From Outdoors, page 5.

If your home does not meet all of the three criteria above, proceed to
Determining Fresh-Air Flow For Appliance Location, below.

Confined and Unconfined Space

The National Fuel Gas Code, ANSI Z223.1/NFPA 54 defines a confined space
as a space whose volume is less than 50 cubic feet per 1,000 Btu per hour
(4.8 m
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 m

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.

* Adjoining rooms are communicating only if there are odorless passageways
or ventilation grills between them.

2

) or less with openings gasketed or sealed and

3

per kw) of the aggregate input rating of all appliances installed in that

3

per kw) of the aggregate input

-11

kg per

and

DETERMINING FRESH-AIR FLOW FOR
APPLIANCE 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 appliance plus
any adjoining rooms with odorless 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.

AIR FOR COMBUSTION AND VENTILATION

Providing Adequate Ventilation (Cont.)

Determining Fresh-Air Flow for Appliance Location

5

5

2.Multiply the space volume by 20 to determine the maximum Btu/Hr the
space can support.

____________(volume of space) x 20 = (Maximum 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 appliance _____________

Gas water appliance* _____________ Btu/Hr

Gas furnace _____________ Btu/Hr

Vented gas appliance _____________ Btu/Hr

Gas fireplace logs _____________

Other gas appliances* + _____________

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 appliance _____________ Btu/Hr

Vent-free appliance + _____________

Total = _____________

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)

_________

Example: 51,200 Btu/Hr (maximum the space can support)

73,000 Btu/Hr (actual amount of Btu/Hr used)

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 worksheet, adding the space of an adjoining room. If the extra
space provides an unconfined space, remove door to adjoining room or
add ventilation grills between rooms. See Ventilation Air From Inside
Building, page 6.

B.Vent room directly to the outdoors. See Ventilation Air From Outdoors,
page 6.

C.Install a lower Btu/Hr appliance, if lower Btu/Hr size makes room unconfined.

If the actual Btu/Hr used is less than the maximum Btu/Hr the space can sup
port, the space is an unconfined space. You will need no additional fresh
air ventilation.

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

40,000

33,000

73,000

Btu/Hr

Btu/Hr

Btu/Hr

Btu/Hr

Btu/Hr

WARNING: If the area in which the appliance may be oper-

ated is smaller than that defined as an unconfined 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/NFPA 54 Section 5.3
or applicable local codes.

114745-01

114745-01

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Outlet
Air

Ventilated
Attic

Outlet
Air

Inlet
Air

Inlet Air

Ventilated

Crawl Space

To

Crawl

Space

To Attic

Or

Remove
Door into
Adjoining

Room,
Option

3

Ventilation Grills

Into Adjoining Room,

Option

2

Ventilation

Grills

Into Adjoining

Room,

Option 1

12"

12"

AIR FOR COMBUSTION AND VENTILATION

6

Ventilation Air

AIR FOR COMBUSTION AND
VENTILATION

Continued

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 2). You can also
remove door into adjoining room (see option 3, Figure 2). 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 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. 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 thermostat-controlled power vent. Heated air entering the attic will
activate the power vent.

Figure 2 - Ventilation Air from Inside Building

Figure 3 - Ventilation Air from Outdoors

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114745-01

114745-01

INSTALLATION

INSTALLATION

Check Gas Type

Installation and Clearences for Vent-free

Operation

7

7

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 primary heating 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 event of a
power outage, you can use this heater as your primary heat source.

WARNING: A qualified service person must install heater. Fol­low all local codes.

NOTICE: State or local codes may only allow operation of this appli­ance in a vented configuration. Check your state or local codes.

WARNING: Make sure the selector switch is in the OFF position
before installing heater.

WARNING: Before installing in a solid fuel burning fireplace,
the chimney flue and firebox must be cleaned of soot, creosote,
ashes and loose paint by a qualified chimney cleaner. Creosote
will ignite if highly heated. A dirty chimney flue may create and
distribute soot within the house. Inspect chimney flue for damage.
If damaged, repair flue damper before operating appliance.

CAUTION: This heater creates warm air currents. These cur­rents move heat to wall surfaces next to heater. Installing heater
next to vinyl or cloth wall coverings or operating heater where
impurities (such as, but not limited to, tobacco smoke, aromatic
candles, cleaning fluids, oil or kerosene lamps, etc..) in the air
exist, may discolor walls or cause odors.

IMPORTANT: Vent-free heaters add moisture to the air. Although
this is beneficial, installing heater in rooms withought enough
ventilation air may cause mildew to form from too much moisture.
See Air for Combustion and Ventilation, pages 4 through 6.

CHECK GAS TYPE

Use the correct gas type (natural or propane/LP) for your unit. If your gas
supply is not correct, do not instal in fireplace. Call dealer where you bought
the appliance for proper type of appliance.

INSTALLATION AND CLEARANCES
FOR VENT-FREE OPERATION

WARNING: Maintain the minimum clearances. If you can,
provide greater clearences from floor, ceiling, and adjoining

WARNING: Seal any fresh air vents or ash clean-out doors
located on floor or wall of fireplace. If not, drafting may cause pilot
outage or sooting. Use a heat-ressistant sealant. Do not seal chim
ney flue damper.

WARNING: Never install the heater

• in a bedroom or bathroom unless installed as a vented appli-
annce, see page 10

• in a recreational vehicle

• where curtains, furniture, clothing, or other flammable objects
are

Less than 42 inches from the front, top, or sides of heater

• in high traffic areas

• in windy or drafty areas

MINIMUM FIREPLACE CLEARANCE

TO COMBUSTIBLE MATERIALS

-

LOG SIZE 18", 24"

SIDE WALL 16"

CEILING 42"

FLOOR 5"

LOG SIZING REQUIREMENTS

LOG MINIMUM FIREBOX SIZE

SIZE HEIGHT DEPTH FRONT WIDTH REAR WIDTH

18" 18" 14" 30" 20.5"

24" 18" 14" 30" 24.5"

*Measured at 14" depth

Allow adequate clearences for accessibility for purposes of servic­ing and proper operation

114745-01

114745-01

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Heat Resistant
Material

(A)

INSTALLATION

8

Installation and Clearences for Vent-free
Operation (cont.)

INSTALLATION

Continued

Care fully follow the instructions below. This will ensure safe installation
into masonary, UL127-listaed manufactured fireplace, or listed vent-free
firebox.

Minimum Clearances For Side Combustible material, side
wall, and ceiling

A. Clearances from the side of the fireplace cabinet to any combustible
material and wall should follow diagram in figure 4.

Example: The face of a mantel, bookshelf, etc.. is made of combus­ tible material must be 4" from the side of the fireplace to the cabinet
(see figure 4).

B. Clearances from the top of the fireplace opening to the ceiling should
not be less than 42 inches.

Example

*

*Minimum 16 inches from Side Wall

Figure 4 - Minimum Clearance for Combustible to Wall

If Using Mantel

You must have non-combustible material(s) above the fireplace opening.
Non-combustible materials (such as slate, marble, tile, etc.) must be at least
1/2 inch thick. With sheet metal, you must have non-combustible material
behind it. Non-combustible material must extend at least 8 inches up (for
all models). If non-combustible material is less than 12", you must install
the fireplace hood accessory (24" Models Only). Even if non-combustible
material is more than 12", you may need the hood accessory to deflect heat
away from your mantel shelf. See Figure 5 and Figures 6 and 7, page 9, for
minimum clearances.

IMPORTANT: If you cannot meet these minimum clearances, you must
operate heater with chimney flue damper open. Go to Installing Damper
Clamp Accessory for Vented Operation, page 10.

Noncombustible Requirements for
Material Distance (A) Safe Installation

12" or more Non-combustible material OK.

Between 8" and 12" 24" Models: Install fireplace hood acces-

18" Model: Non-combustible material

Less than 8" Non-combustible material must be extend-

sory (GA60

27).

OK.

ed to at least 8". See Between 8" and 12",
above. If you cannot extend material, you
must operate heater with flue damper
open.

60, see Accessories, page

NOTICE: Non thermostat controlled heaters maybe used as a
vented product. If so, you must always run heater with chimney
flue damper open, noncombustible material above the fireplace
opening is not needed. Go to Installing Damper Clamp Accessory

for vented operation.

Minimum Noncombustible material
Clearences

If Not Using Mantel

Note: If using a mantel proceed to If Using Mantel. If not using mantel, follow
the information on this page.

You must have non-combustible material(s) above the fireplace opening.
Non-combustible materials (such as slate, marble, tile, etc..) Must be at
least 1/2 inch thick. With sheet metal, you must have non-combustible
material behind it. Non-combustible material must extend at least 8" up (for
all models). If non-combustible material is less than 12", you must install
the fireplace hood accessory (24" and 30" Models Only). See Figure 5 for
minimum clearances.

For more information, visit www.desatech.com

Figure 5 - Heat Resistant Material (Slate, Marble, Tile, etc.) Above
Fireplace

114745-01

114745-01

INSTALLATION

14"
Min.

Combustible
Material

Non-Combustible
Material

Hearth

5"
Min.

Combustible
Material

F IR E P L A C E C L E A R A N C E S 5

M in im u m N o n ­C o m b u s tib le
M a te ria l

M in im u m N o n ­C o m b u s tib le
M a te ria l H e ig h t

D is ta n c e s to
U n d e rs id e o f
M a n te l

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U n d e rs id e o f
M a n te l S h e lf

1 2 "

8 "

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F IR E P L A C E C L E A R A N C E S 5

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Continued

MANTEL CLEARANCES

In addition to meeting non-combustible material clearances, you must also meet

required clearances between fireplace opening and mantel shelf. If you do not
meet the clearances listed below, you will need a hood.

Determining Minimum Mantel Clearance

If you meet minimum clearance between mantel shelf and top of fireplace
opening, a hood is not required (see Figure 6).

Determining Minimum Mantel Clearance
When Using a Hood

If minimum clearances in Figure 6 are not met, you must have a hood. When
using a hood there are still certain minimum mantel clearances required.
Follow minimum clearances shown in Figure 7 when using hood.

Mantel Clearances

INSTALLATION

Floor Clearances

9

9

NOTICE: Surface temperatures of adjacent walls and mantels be
come hot during operation. Walls and mantels above the firebox may
become hot to the touch. If installed properly, these temperatures
meet the requirement of the national product standard. Follow all
minimum clearances shown in this manual.

NOTICE: If your installation does not meet the minimum clearances
shown, you must do one of the following:

• operate the logs only with the flue damper open

• raise the mantel to an acceptable height

• remove the mantel

FLOOR CLEARANCES

A. If installing appliance on the floor level, you must maintain the minimum

distance of 14" to combustibles (see Figure 8).

B. If combustible materials are less than 14" to the fireplace, you must

install appliance at least 5" above the combustible flooring

(See Figure 9).

For more information, visit www.desatech.com

114745-01

114745-01

Figure 6 - Minimum Mantel Clearances Without Using Hood

-

Figure 7 - Minimum Mantel Clearances When Using Hood

Figure 8 - Minimum Fireplace
Clearances If Installed at Floor
Level

Figure 9 - Minimum Fireplace
Clearances Above
Combustible Flooring

10

INSTALLATION

Installing Damper Clamp Accessory for Vented Operation
Installing Heater Assembly

INSTALLATION

Continued

INSTALLING DAMPER CLAMP ACCESSORY
FOR VENTED OPERATION

Note: When used as a vented decorative, appliance must be installed only
in a solid-fuel burning fireplace with a working flue and constructed of non
combustible material.

If your heater is a non-thermostatically-controlled model, you may use this
heater as a vented product. There are three reasons for operating your
heater in the vented mode.

1. The fireplace does not meet the clearance to combustibles requirements
for vent-free operation.

2. State or local codes do not permit vent-free operation.

3. You prefer vented operation.

If reasons number 1 or 2 above apply to you, you must permanently open
chimney flue damper. You must install the damper clamp accessory (to order,
see Accessories, page 27). This will insure vented operation (see Figure

10). The damper clamp will keep damper open. Installation instructions are

included with clamp accessory.

See chart below for minimum permanent flue opening you must provide.
Attach damper clamp so the minimum permanent flue opening will be
maintained at all times.

Area of Various Standard

Round Flues

Diameter (ins.) Area (sq. ins.)

5" 20 sq. inches
6" 29 sq. inches
7" 39 sq. inches
8" 51 sq. inches

INSTALLING HEATER ASSEMBLY

WARNING: If installing in a sunken fireplace, special care is needed.

You must raise the fireplace floor to allow access to heater control panel.
This will insure adequate air flow and guard against sooting. Raise fireplace

­floor with non

CAUTION: Do not pick up heater assembly by logs. This could dam-

age

unit. Only handle assembly by grates.

IMPORTANT: Make sure the heater burners are level. If heater is not level,
heater will not work properly.

Installation Items Needed

• control cover kit (provided with heater)

• approved flexible gas hose and fittings (provided with heater) (if allowed
by local codes)

• sealant (resistant to propane/LP gas, not provided)

Note: Install optional GHRCTA Receiver and Hand-Held Remote Control Kit
(see Accessories, page 27) before installing gas log heater (Remote-Ready
Models Only). See installation instructions included with the kit.

1. Apply pipe joint sealant lightly to male threads of gas fitting (not pro

vided). Connect approved flexible gas hose to inlet side of gas control
(see Figure 11).

2. Position heater assembly in fireplace.

3. Connect to gas supply. See Connecting To Gas Supply, (see Figure

12, page 11).

-combustible material. Make sure material is secure.

-

Chimney Minimum Permanent

Height (ft.) Flue Opening (sq. ins.)

6' to 15' 39 sq. inches
15' to 30' 29 sq. inches

Damper Clamp

Damper

Masonry Fireplace

Figure 10 - Attaching Damper Clamp

Manufactured Fireplace

Damper Clamp

Damper

Damper

Figure 11 - Attaching Flexible Gas Hose to Heater Gas Regulator

Flexible Gas Hose

(if allowed by local
codes)

For more information, visit www.desatech.com

Gas Control

114745-01

114745-01