Desa EFS33NRA Quick start guide

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WARNING: If the information in this manual is not fol-
lowed 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 quali-
fied installer, service agency or the gas supplier.
UNVENTED (VENT-FREE) GAS FIREPLACE
OWNER’S OPERATION AND INSTALLATION MANUAL
Shown with optional cabinet mantel, hearth base and trim accessories.
EFS33NR, EFS33NRA, EFS33PR, EFS33PRA
VSGF33NR, VSGF33NRA, VSGF33PR, VSGF33PRA
REMOTE-READY FIREPLACE SYSTEM

www.desatech.com 107172-01K2
WARNING: Improper installation, adjustment, altera-
tion, service or maintenance can cause injury or prop-
erty damage. Refer to this manual for correct installation
and operational procedures. For assistance or addi-
tional 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. Provi-
sions for adequate combustion and ventilation air must
be provided. Refer to Air for Combustion and Ventilation
section on page 6 of this manual.
This appliance may be installed in an aftermarket,* per-
manently located, manufactured (mobile) home, where
not prohibited by local codes.
This appliance is only for use with the type of gas indi-
cated on the rating plate. This appliance is not convert-
ible for use with other gases.
* Aftermarket: Completion of sale, not for purpose of resale, from the manufacturer
State of Massachusetts: The installation must be made by a licensed plumber or gas fitter in the
Commonwealth of Massachusetts.
Sellers of unvented propane or natural gas-fired 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 Common-
wealth of Massachusetts.
TABLE OF CONTENTS
Safety Information ............................................... 3
Product Identification ........................................... 4
Local Codes ........................................................ 5
Unpacking ........................................................... 5
Product Features ................................................. 5
Air For Combustion and Ventilation ..................... 6
Installation ........................................................... 8
Operating Fireplace ........................................... 19
Inspecting Burners ............................................ 22
Cleaning and Maintenance ................................ 23
Wiring Diagram .................................................. 24
Specifications .................................................... 24
Troubleshooting ................................................. 25
Replacement Parts ............................................ 29
Service Hints ..................................................... 29
Technical Service .............................................. 29
Illustrated Parts Breakdown and Parts List ....... 30
Accessories ....................................................... 34
Warranty Information ......................................... 36

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107172-01K 3
SAFETY INFORMATION
WARNING: This product con-
tains and/or generates chemicals
known to the State of California
to cause cancer or birth defects
or other reproductive harm.
IMPORTANT: Read this owner’s
manual carefully and completely
before trying to assemble, op-
erate or service this fireplace.
Improper use of this fireplace
can cause serious injury or
death from burns, fire, explo-
sion, 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 head-
aches, dizziness or nausea. If you have these signs,
the heater may not be working properly. Get fresh
air at once! Have heater 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 and Propane/LP Gas: Natural and pro-
pane/LP gases are odorless. An odor-making
agent is added to these gases. 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 warn-
ings. Keep this manual for reference. It is your
guide to safe and proper operation of this heater.
WARNING: Any change to
this heater or its controls can
be dangerous.
WARNING: Do not use a
blower insert, heat exchanger
insert or other accessory not ap-
proved for use with this heater.
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.
Fireplace front and screen be-
come very hot when running fire-
place. Keep children and adults
away from hot surfaces to avoid
burns or clothing ignition. Fire-
place will remain hot for a time
after shutdown. Allow surfaces
to cool before touching.
Carefully supervise young chil-
dren when they are in the room
with fireplace. When using the
hand-held remote accessory,
keep selector switch in the OFF
position to prevent children
from turning on burners with
remote.
You must operate this fireplace
with a fireplace screen and hood
in place. Make sure fireplace
screen and hood are in place
before running heater.
Keep the appliance area clear
and free from combustible ma-
terials, gasoline and other flam-
mable vapors and liquids.

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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. Do not place propane/LP supply tank(s) in-
side any 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 neighborʼs phone. Follow the gas
supplierʼs instructions
• if you cannot reach your gas supplier, call
the fire department
4. This fireplace shall not be installed in a bed-
room or bathroom.
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. To prevent the creation of soot, follow the
instructions in Cleaning and Maintenance,
page 23.
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 burner
box or on adjacent walls or furniture.
9. This fireplace needs fresh air ventilation to run
properly. This fireplace has an Oxygen Deple-
tion Sensing (ODS) safety shutoff system. The
ODS shuts down the fireplace if enough fresh
air is not available. See Air for Combustion
and Ventilation, page 6. If fireplace keeps
shutting off, see Troubleshooting, page 25.
10. Do not run fireplace
• where flammable liquids or vapors are
used or stored
• under dusty conditions
11. Do not use this fireplace to cook food or burn
paper or other objects.
12. 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.
SAFETY INFORMATION
Continued
13. Do not operate fireplace if any log is broken.
Do not operate fireplace if a log is chipped
(dime-sized or larger).
14. Turn fireplace off and let cool before servicing.
Only a qualified service person should service
and repair fireplace.
15. Operating fireplace above elevations of 4,500
feet could cause pilot outage.
16. To prevent performance problems in propane/LP
units, do not use propane/LP fuel tanks of less
than 100 lbs. capacity (propane/LP units only).
17. Provide adequate clearances around air openings.
PRODUCT IDENTIFICATION
Optional Blower
Assembly
(Not Included)
Optional
Remote
Control
Top Louver
Assembly
Fireplace
Hood
Bottom Louver Assembly
Screen
Assembly
Top Outer
Casing
Firebox
Support
Figure 2 - Fireplace (VSGF33NRA Shown)
Figure 1 - Log Base Assembly
(VSGF33NRA Shown)
Front
Log
Rear Log
Middle Log
Base Assembly
Front
Burner
Piezo
Ignitor
Rear Burner

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107172-01K 5
LOCAL CODES
Install and use heater with care. Follow all local
codes. In the absence of local codes, use the lat-
est 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.
Batterymarch Park
Quincy, MA 02269
Note: Where listed vented decorative logs are
required, thermostat operation is not permitted.
UNPACKING
CAUTION: Do not remove the
data plates attached to the heater
base assembly. The data plates
contain important warranty and
safety information.
1. With utility knife, cut the carton all the way
around above the staples on the bottom tray.
Lift the carton off the heater. Remove packing.
Note: The hood is located in the packing on
the right hand side of the heater front. Lift the
heater off the bottom tray.
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. Remove fireplace hood from carton insert.
5. Check all items for any shipping damage. If
damaged, promptly inform dealer where you
bought fireplace.
PRODUCT FEATURES
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 optional blower, the fireplace requires
no electricity making it ideal for emergency
backup heat.
SAFETY DEVICE
This fireplace has a pilot with an Oxygen Depletion
Sensing (ODS) safety shutoff system. The ODS/
pilot is a required feature for vent-free room heat-
ers. The ODS/pilot system shuts off the fireplace
if there is not enough fresh air.
PIEZO IGNITION SYSTEM
This fireplace has a piezo ignitor. This system
requires no matches, batteries or other sources to
light fireplace.
OPTIONAL REMOTE CONTROL
ACCESSORY
There are four optional remote controls (not
included) that can be purchased separately for
this log heater:
• wall switch
• wall thermostat
• hand-held ON/OFF remote
• hand-held thermostat remote
See Accessories, page 34.
OPTIONAL BLOWER ASSEMBLY
ACCESSORY
This fireplace accepts an optional blower assembly
(not included). The GA3700TA Series blower
operates thermostatically and features a variable
speed control. The GA3700 Series operates manu-
ally and also features a variable speed control. The
blower circulates heated air from the fireplace into
the room. Use of blower is optional. See Acces-
sories, page 34.

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Unusually tight construction is defined as
construction where:
a. walls and ceilings exposed to the out-
side atmosphere have a continuous
water vapor retarder with a rating of
one perm (6 x 10-11 kg per pa-sec-m2) or
less with openings gasketed or sealed
and
b. weather stripping has been added on
openable windows and doors and
c. caulking or sealants are applied to
areas such as joints around window
and door frames, between sole plates
and 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 Ventilation Air From Outdoors, page 7.
If your home does not meet all of the three
criteria above, proceed to Determining
Fresh-Air Flow For Heater Location.
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 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 com-
municating 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 doorless passageways or ventilation grills
between them.
DETERMINING FRESH-AIR FLOW
FOR HEATER 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
heater plus any adjoining rooms with doorless pas-
sageways 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)
AIR FOR COMBUSTION
AND VENTILATION
WARNING: This heater shall
not be installed in a confined
space or unusually tight con-
struction unless provisions are
provided for adequate combus-
tion and ventilation air. Read the
following instructions to insure
proper fresh air for this and
other fuel-burning appliances
in your home.
Todayʼs 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 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 fol-
lowing ventilation classifications:
1. Unusually Tight Construction
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.

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107172-01K 7
Example: Space size 20 ft. (length) x 16 ft.
(width) x 8 ft. (ceiling height) = 2,560 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: 2,560 cu. ft. (volume of space) x 20 =
63,360 (maximum Btu/Hr the space can support)
3. Add the Btu/Hr of all fuel burning appliances in
the space.
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
* Do not include direct-vent gas appliances. Di-
rect-vent draws combustion air from the outdoors
and vents to the outdoors.
Example:
Gas water heater __________ Btu/Hr
Vent-free fireplace +
__________ 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: 63,360 Btu/Hr (maximum the space
can support)
73,000 Btu/Hr (actual amount of
Btu/Hr used)
The space in the 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 ad-
ditional fresh air. Your options are as follows:
A. Rework worksheet, adding the space of an adjoin-
ing 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.
B. Vent room directly to the outdoors. See Ventila-
tion Air From Outdoors.
C. Install a lower Btu/Hr fireplace, if lower Btu/Hr
size makes room unconfined.
AIR FOR COMBUSTION
AND VENTILATION
Continued
40,000
33,000
73,000
If the actual Btu/Hr used is less than the maximum
Btu/Hr the space can support, the space is an uncon-
fined space. You will need no additional fresh air
ventilation.
WARNING: If the area in
which the heater 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.
VENTILATION AIR
Ventilation Air From Inside Building
This fresh air would come from an adjoining un-
confined 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, ANSI Z223.1/NFPA 54, Section 5.3, Air for
Combustion and Ventilation for required size of
ventilation grills or ducts.
Figure 3 - 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"

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INSTALLATION
NOTICE: This heater is intended
for use as supplemental heat.
Use this heater along with your
primary heating system. Do not
install this heater as your pri-
mary heat source. If you have a
central heating system, you may
run system’s circulating blower
while using heater. This will help
circulate the heat throughout the
house. In the event of a power
outage, you can use this heater
as your primary heat source.
WARNING: A qualified ser-
vice person must install heater.
Follow all local codes.
WARNING: Never install the
fireplace
• in a bedroom or bathroom
• in a recreational vehicle
• where curtains, furniture, cloth-
ing or other flammable objects
are less than 42 inches from the
front, top or sides of the heater
• in high traffic areas
• in windy or drafty areas
CAUTION: This heater cre-
ates warm air currents. These
currents move heat to wall sur-
faces 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 flu-
ids, oil or kerosene lamps, etc.) in
the air exist, may discolor walls
or cause odors.
Note: Your fireplace is designed to be used in zero
clearance installations. Wall or framing material
can be placed directly against any exterior surface
on the rear, sides or top of your fireplace, except
where standoff spacers are integrally attached. If
standoff spacers are attached to your fireplace,
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 Fire-
place Installation, page 11.
IMPORTANT: Vent-free heaters add moisture to
the air. Although this is beneficial, installing fire-
place in rooms without enough ventilation air may
cause mildew to form from too much moisture.
See Air for Combustion and Ventilation, pages 6.
IMPORTANT: Make sure the fireplace is level.
If fireplace is not level, log set will not work
properly.
CHECK GAS TYPE
Use the correct gas type (natural or propane/LP)
for your fireplace. If your gas supply is not cor-
rect, do not install fireplace. Call dealer where you
bought fireplace for proper type fireplace.
Figure 4 - Ventilation Air from Outdoors
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.
AIR FOR COMBUSTION
AND VENTILATION
Continued
Outlet
Air
Ventilated
Attic
Outlet
A
ir
Inlet
Air
Inlet Air Ventilated
Crawl Space
To
Crawl
Space
To Attic

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107172-01K 9
WARNING: This appliance
is equipped for (natural or pro-
pane/LP) gas. Field conversion
is not permitted.
ELECTRICAL HOOKUP
(Models GA3700 Series and GA3700T
Series Blower Accessories and GA3555
Internal Duplex Kit)
This fireplace accepts 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. The GA3555 outlet acces-
sory may be used for built-in applications with
blower accessory installed.
INSTALLING HOOD
Install hood to rail already installed in fireplace
as shown in Figure 5. Use 3 Phillips screws
provided.
INSTALLATION
Continued
Figure 5 - Installing Hood
Screw
Hood
Rail
Figure 7 - Attaching Brass Trim to
Fireplace (VSGF33NRA Shown)
Figure 6 - Assembling Brass Trim
Side Brass
Trim
Top
Brass
Trim
Slot
Mitered Edge
Slot
Shim
Set Screws
Adjusting
Plate
Trim
Hanging
Screws
Assembled
Brass Trim
Hanging
Notches
on Trim
ASSEMBLING AND ATTACHING
OPTIONAL BRASS TRIM
(Included with Mantel Accessory)
IMPORTANT: If you are recessing the firebox in
a wall, do not attach brass trim at this time. See
Built-In Fireplace Installation, page 11.
Note: The instructions below show assembling
and attaching brass trim to fireplace.
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 6.
4. Slide one end of adjusting plate/shim in slot on
mitered edge of top brass trim (see Figure 6).
5. Slide other end of adjusting plate/shim in slot on
mitered edge of side brass trim (see Figure 6).
6. While firmly holding edges of brass trim to-
gether, tighten both set screws on the adjusting
plate with slotted screwdriver.
7. Repeat steps 1 through 6 for other side.
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 7). Push trim
firmly into place, sliding hanging notches over
hanging screws.

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*
INSTALLATION
Continued
INSTALLATION CLEARANCES
WARNING: 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 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 8.
Example: The face of a mantel, bookshelf,
etc. is made of combustible material and
protrudes 3 1/2" from the wall. This combus-
tible material must be 4" from the side of the
fireplace opening (see Figure 8).
B. Clearances from the top of the fireplace open-
ing to the ceiling should not be less than 42
inches.
*Minimum 16 inches from Side Wall
Example
Figure 8 - Minimum Clearance for
Combustible to Wall
CONVENTIONAL FIREPLACE
INSTALLATION
Conventional installation of this fireplace involves
installing fireplace along with the corner, face or
cabinet mantel with hearth base accessories against
a wall in your home. Follow the instructions in
this section to install the fireplace in this manner.
Note: The instructions in this section show instal-
lation using the cabinet mantel and the GC3333F/
GC3334U/G3004W/GC3335F/G3007U series
hearth base accessories. The hearth base accessory
shown is optional for this installation. You can
install fireplace and cabinet/corner mantel directly
on the floor. The corner mantel accessory cannot be
installed with the GC3333F/GC3334U/G3004W/
GC3335F/G3007U hearth base. The corner mantel
can be paired with the G3008F/G3009U/G3010F
corner hearth base. If mounting fireplace and cabinet
or corner mantel to the floor, an optional G3005J/
3005S/3005B Slim Base kit may be installed.
1. Assemble cabinet mantel, hearth base and
trim accessories. Assembly instructions are
included with each accessory.
2. When installing blower, install a properly
grounded, 120 volt three-prong electrical out-
let at fireplace location if an outlet is not there.
If possible, locate outlet so cabinet mantel will
cover it when installed (see Figure 9).
3. Install gas piping to fireplace location. This in-
stallation includes an approved flexible gas line
(if allowed by local codes) after the equipment
shutoff valve. The flexible gas line must be the
last item installed on the gas piping. See Install-
ing Gas Piping to Fireplace Location, page 13.
4. Place hearth base accessory against wall at instal-
lation location. Cut an access hole in hearth 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.
MINIMUM CLEARANCE TO
COMBUSTIBLE MATERIALS
Top Left and Bottom
Right Sides and Rear
0" 16" 0"
*
Figure 9 - Placing Hearth Base
Accessory Against Wall
Electrical Outlet
Hearth Base
Rigid Pipe and Gas
Shutoff Valve
Gas Line Access Hole

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107172-01K 11
INSTALLATION
Continued
5. Route flexible gas line through access hole in
hearth base.
6. Center cabinet mantel on hearth base (see
Figure 10). Make sure mantel is flush against
wall.
7. Break off nailing flanges (see Figure 11) with
hammer or pliers.
8. Place cardboard or other protective material
on top of hearth base. Carefully set fireplace
on protective material, with back of fireplace
inside mantel opening.
9. Attach flexible gas line from fireplace gas
regulator to gas supply. See Connecting
Fireplace to Gas Supply, page 14.
10. If blower is installed, route blower electrical
cord through access holes in either side of
fireplace. Note: Bushing may be moved if
necessary. Plug electrical cord into electrical
outlet.
11. Carefully insert fireplace into cabinet mantel.
Be careful not to scratch or damage hearth base,
cabinet mantel or any laminate trim on hearth
base. Remove protective material from top of
hearth base and from front of fireplace (if any).
Note: You can secure fireplace to hearth or
floor. Open lower louver. Locate screw holes in
bottom of base. Tighten wood screws through
these holes and into hearth or floor.
12. Check all gas connections for leaks. See
Checking Gas Connections, page 15.
Figure 10 - Installing Cabinet Mantel
Figure 12 - Inserting Fireplace Into
Cabinet Mantel
Figure 11 - Location of Nailing Flanges
Cabinet
Mantel
Nailing
Flanges
Actual Framing
Height 32 3/8" 33"
Front Width 34 5/16" 35 1/2"
Depth 16 11/16" 17 3/4"
BUILT-IN FIREPLACE
INSTALLATION
Built-in installation of this fireplace involves
installing fireplace into a framed-in enclosure.
This makes the front of fireplace flush with wall.
If installing a mantel above the fireplace, you must
follow the clearances shown in Figure 16, page
13. Follow the instructions below to install the
fireplace in this manner.

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INSTALLATION
Continued
1. Frame in rough opening. Use dimensions
shown in Figure 13 for the rough opening. If
installing in a corner, use dimensions shown
in Figure 14 for the rough opening. The height
is 33" which is the same as the wall opening
above.
2. If using blower, install and properly ground
GA3555, three-prong 120 volt electrical out-
let, in fireplace. Follow instructions included
in kit.
3. Install gas piping into fireplace location. This
installation includes an approved flexible gas
line (if allowed by local codes) after the equip-
ment shutoff valve. The flexible gas line must
be the last item installed on the gas piping. See
Installing Gas Piping to Fireplace Location,
page 13.
4. Carefully set fireplace in front of rough opening
with back of fireplace inside wall opening.
5. Carefully insert fireplace into rough opening.
6. Attach flexible gas line to gas supply. See Con-
necting Fireplace to Gas Supply, page 14.
7. Attach fireplace to wall studs using nails or
wood screws through holes in nailing flange
(see Figure 15).
8. Check all gas connections for leaks. See
Checking Gas Connections, page 15.
9. Plug electrical cord into electrical outlet
installed in step 2.
10. Install brass trim after final finishing and/or
painting of wall (see Figure 7, page 9).
Figure 13 - Rough Opening for Installing
in Wall
Figure 14 - Rough Opening for Installing
in Corner
Figure 15 - Attaching Fireplace to Wall
Studs
35 1/2"
17 3/4"
33"
39 3/8"
27 7/8"
55 5/8"
35 1/2"
Nailing Flanges
Nails or
Wood
Screws
Mantel Clearances for Built-In
Installation
If placing mantel above built-in fireplace, you must
meet minimum clearance between mantel shelf and
top of fireplace opening.
NOTICE: If your installation does
not meet the minimum clear-
ances shown, you must do one
of the following:
• raise the mantel to an accept-
able height
• remove the mantel
NOTICE: Surface temperatures
of adjacent walls and mantels
become 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.

www.desatech.com
107172-01K 13
INSTALLATION
Continued
13"
16"
19"
21"
2 1/2"
6"
8"
10"
Minimum Non-
Combustible
Material
Figure 16 - Minimum Mantel Clearances
for Built-In Installation
Mantel Shelf
Note: All vertical
measurements
are from top
of fireplace
opening to
bottom of
mantel shelf.
INSTALLING GAS PIPING TO
FIREPLACE LOCATION
WARNING: This appliance
requires a 1/2" NPT (National
Pipe Thread) inlet connection to
the pressure regulator.
WARNING: A qualified
service person must connect
fireplace to gas supply. Follow
all local codes.
CAUTION: Never connect pro-
pane/LP fireplace directly to the
propane/LP supply. This fireplace
requires an external regulator
(not supplied). Install the external
regulator between the fireplace
and propane/LP supply.
WARNING: Never connect
natural gas fireplace to private
(non-utility) gas wells. This
gas is commonly known as
wellhead gas.
Installation Items Needed
Before installing fireplace, make sure you have
the items listed below.
• external regulator for propane/LP unit only
(supplied by installer)
• piping (check local codes)
• sealant (resistant to propane/LP gas)
• equipment shutoff valve *
• test gauge connection *
• sediment trap (optional)
• tee joint
• pipe wrench
• approved flexible gas line with gas connector
(if allowed by local codes) (not provided)
* A CSA design-certified equipment shutoff valve
with 1/8" NPT tap is an acceptable alternative to
test gauge connection. Purchase the optional CSA
design-certified equipment shutoff valve from your
dealer. See Accessories, page 34.
For propane/LP units, the installer must supply
an external regulator. The external regulator will
reduce incoming gas pressure. You must reduce
incoming gas pressure to between 11 and 14 inches
of water. If you do not reduce incoming gas pres-
sure, heater regulator damage could occur. Install
external regulator with the vent pointing down
as shown in Figure 17. Pointing the vent down
protects it from freezing rain or sleet.
CAUTION: Use only new,
black iron or steel pipe. Inter-
nally-tinned copper tubing may
be used in certain areas. Check
your local codes. Use pipe of
1/2" diameter or greater to allow
proper gas volume to fireplace.
If pipe is too small, undue loss
of volume will occur.
Figure 17 - External Regulator with Vent
Pointing Down
External
Regulator
Vent
Pointing
Down
Propane/LP
Supply Tank

www.desatech.com 107172-01K14
INSTALLATION
Continued
Installation must include an equipment shutoff valve,
union and plugged 1/8" NPT tap. Locate NPT tap
within reach for test gauge hook up. NPT tap must
be upstream from fireplace (see Figure 18).
IMPORTANT: Install equipment shutoff valve
in an accessible location. The equipment shutoff
valve is for turning on or shutting off the gas to
the appliance.
Check your building codes for any special re-
quirements for locating equipment shutoff valve
to fireplaces.
Apply pipe joint sealant lightly to male NPT threads.
This will prevent excess sealant from going into pipe.
Excess sealant in pipe could result in clogged fire-
place valves. Never use sealant on flare threads.
WARNING: Use pipe joint
sealant that is resistant to liquid
petroleum (LP) gas.
We recommend that you install a sediment trap in
supply line as shown in Figure 18. Locate sediment
trap where it is within reach for cleaning. Install in
piping system between fuel supply and fireplace.
Locate sediment trap where trapped matter is not
likely to freeze. A sediment trap traps moisture and
contaminants. This keeps them from going into fire-
place gas controls. If sediment trap is not installed or
is installed wrong, fireplace may not run properly.
* Purchase the optional CSA design-certified
equipment shutoff valve from your dealer. See
Accessories, page 34.
** Minimum inlet pressure for purpose of input
adjustment.
Figure 18 - Gas Connection
Sediment Trap
CSA Design-Certified
Equipment Shutoff Valve
With 1/8" NPT Tap*
3" Minimum
Cap Pipe Tee
Nipple Joint
Natural Gas
From Gas Meter
(5" W.C.** to
10.5" W.C.
Pressure)
Propane/LP
From External
Regulator
(11" W.C.** to 14"
W.C. Pressure)
CONNECTING FIREPLACE TO GAS
SUPPLY
Installation Items Needed
• 5/16" hex socket wrench or nut-driver
• Phillips screwdriver
• sealant (resistant to propane/LP gas, not pro-
vided)
1. Remove fireplace screen. Remove two screws
that hold fireplace screen in place for shipping.
These screws are located near top of screen.
Discard screws. Lift fireplace screen up and
pull out to remove.
2. Remove screws that attach log base assembly
to fireplace (see Figure 19). Carefully lift up
log base assembly and remove from fireplace
(see Figure 19).
Note: If adding the G8000A series brick liner
accessory, install it now. Follow instructions in
G8000A accessory kit.
CAUTION: Do not pick up
log base assembly by burner.
This could damage burner. Only
handle base by grates.
3. Route gas line (provided by installer) from
equipment shutoff valve to fireplace. Route
flexible gas supply line through one of the
access holes.
Figure 19 - Removing Log Base
Assembly From Fireplace

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107172-01K 15
INSTALLATION
Continued
CHECKING GAS CONNECTIONS
WARNING: Test all gas piping
and connections, internal and
external to unit, for leaks after
installing or servicing. Correct
all leaks at once.
WARNING: Never use an
open flame to check for a leak.
Apply a noncorrosive leak detec-
tion fluid to all joints. Bubbles
forming show a leak. Correct all
leaks at once.
CAUTION: Make sure exter-
nal regulator has been installed
between propane/LP supply and
fireplace. See guidelines under
Connecting Fireplace to Gas
Supply, page 14.
PRESSURE TESTING GAS SUPPLY
PIPING SYSTEM
Test Pressures In Excess Of 1/2 PSIG
(3.5 kPa)
1. Disconnect fireplace with its main gas valve
(control valve) and equipment shutoff valve
from gas supply piping system. Pressures
in excess of 1/2 psig will damage fireplace
regulator.
2. Cap off open end of gas pipe where equipment
shutoff valve was connected.
3. Pressurize supply piping system by either
opening propane/LP supply tank valve for
propane/LP gas or opening main gas valve
located on or near gas meter for natural gas
or using compressed air.
4. Check all joints of gas supply piping system.
Apply noncorrosive leak detection fluid to all
joints. Bubbles forming show a leak.
5. Correct all leaks at once.
6. Reconnect fireplace and equipment shutoff
valve to gas supply. Check reconnected fittings
for leaks.
NOTICE: Most building codes
do not permit concealed gas
connections. A flexible gas line
is provided to allow accessibility
from the fireplace (see Figure 20).
The flexible gas supply line con-
nection to the equipment shutoff
valve should be accessible.
4. Attach the flexible gas line to gas supply (see
Figure 20). Check tightness of flexible gas
line attached to gas regulator of fireplace (see
Figure 20).
5. Check all gas connections for leaks. See
Checking Gas Connections.
6. Replace log base assembly back into fireplace.
Feed flexible gas line into fireplace base area
while replacing log base assembly. Make sure
the entire flexible gas line is in fireplace base
area. Reattach log base assembly to fireplace
with screws removed in step 2, page 14.
Figure 20 - Attaching Flexible Gas Lines
Together
Flexible Gas Line from
Fireplace Gas Regulator
To Fireplace
Gas Regulator Equipment Shutoff Valve
Provided by Installer
Propane/LP
To External Regulator
Natural Gas
To Gas Meter

www.desatech.com 107172-01K16
Test Pressures Equal To or Less Than
1/2 PSIG (3.5 kPa)
1. Close equipment shutoff valve (see Figure 21).
2. Pressurize supply piping system by either
opening propane/LP supply tank valve for
propane/LP gas or opening main gas valve
located on or near gas meter for natural gas
or using compressed air.
3. Check all joints from gas meter to equipment
shutoff valve for natural gas or propane/LP sup-
ply to equipment shutoff valve for propane/LP
(see Figures 22 and 23). Apply noncorrosive
leak detection fluid to all joints. Bubbles form-
ing show a leak.
4. Correct all leaks at once.
PRESSURE TESTING HEATER GAS
CONNECTIONS
1. Open equipment shutoff valve (see Figure 21).
2. Open main gas valve located on or near gas
meter for natural gas or open propane/LP
supply tank valve.
3. Make sure control knob of fireplace is in the
OFF position.
4. Check all joints from equipment shutoff valve
to gas control valve (see Figures 22 or 23).
Apply noncorrosive leak detection fluid to all
joints. Bubbles forming show a leak.
5. Correct all leaks at once.
6. Light fireplace (see Operating Fireplace, page
19. Check all other internal joints for leaks.
7. Turn off fireplace (see To Turn Off Gas to
Appliance, page 20).
INSTALLATION
Continued
Figure 21 - Equipment Shutoff Valve
Open
Closed
Equipment
Shutoff Valve
Figure 23 - Checking Gas Joints for
Propane/LP Gas
Propane/LP
Supply Tank
Equipment
Shutoff
Valve
Gas Control Valve
Gas Meter
Figure 22 - Checking Gas Joints for
Natural Gas
Gas Control Valve
Equipment Shutoff Valve
INSTALLING LOGS (MODELS
EFS33NR, EFS33PR, VSGF33NR
AND VSGF33PR)
WARNING: Failure to posi-
tion 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.
CAUTION: Do not remove the
metal data plates attached to the
heater base assembly. The data
plates contain important safety
and warranty information.
It is very important to install these logs exactly
as instructed. Do not modify logs. Only use logs
supplied with heater.

www.desatech.com
107172-01K 17
1. Place front log on top of the grate. Make sure
the notches in the bottom of the log fit over
the grate prongs (see Figure 24). Push back
of log flush with metal grate bar.
2. Rest middle log behind metal posts on front
burner. Make sure the grooves in the bottom of
the log fit over the grate. Bring the log forward
next to the metal posts (see Figure 25).
3. Slide the grooves in the back of the rear log
against the rear grate prongs. Make sure the
peg on the log is on top (see Figure 26).
4. Place the crossover log on the rear log and the
middle log. Make sure the peg on the rear log
is in the hole in the bottom of the crossover
log. The crossover log should fit in the cutout
of the middle log (see Figure 27).
5. Install fireplace screen by slipping notches
of fireplace screen over screws on front of
fireplace (see Figure 28).
WARNING: You must operate
this fireplace with the fireplace
screen in place. Make sure fire-
place screen is in place before
running fireplace.
INSTALLATION
Continued
Figure 24 - Installing Front Log
Figure 26 - Installing Rear Log
Figure 25 - Installing Middle Log
Middle Log
Rear Log
Peg
Grate Prong
Rear
Burner
Groove in
Back of Log
Groove in
Back of Log
Grate
Prongs
Metal Grate Bar
Front Log
Notch
Metal Post
Metal Post
Groove
Groove
Grate
Grate
Prong
Figure 27 - Installing Crossover Log
Crossover Log
Hole
Peg
Cutout
Figure 28 - Installing Fireplace Screen
Notches
Screws for
Mounting Screen

www.desatech.com 107172-01K18
INSTALLATION
Continued
INSTALLING LOGS (MODELS
EFS33NRA, EFS33PRA,
VSGF33NRA AND VSGF33PRA)
WARNING: Failure to posi-
tion 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.
CAUTION: Do not remove
the data plates attached to the
heater base assembly. The data
plates contain important safety
and warranty information.
It is very important to install these logs exactly
as instructed. Do not modify logs. Only use logs
supplied with heater.
1. Place front log on top of the grate. Make sure
the notches in the bottom of the log fit over
the grate prongs (see Figure 29). Push back
of logs flush with metal grate bars.
2. Rest middle log behind metal posts on grate as-
sembly. Make sure the grooves in the bottom of
the log fit over the grate. Bring the log forward
next to the metal posts (see Figure 30).
3. Slide the grooves in the back of the rear log
against the rear grate prongs. Make sure the
log fits securely over the prongs (see Figure
31). Make sure log is completely vertical and
not leaning in toward burner where the flame
will touch the log.
4. Install fireplace screen by slipping notches
of fireplace screen over screws on front of
fireplace (see Figure 28, page 17).
WARNING: You must operate
this fireplace with the fireplace
screen in place. Make sure fire-
place screen is in place before
running fireplace.
Figure 29 - Installing Front Log
Figure 31 - Installing Rear Log
Figure 30 - Installing Middle Log
Front Log
Grate
Prongs
Metal Grate Bars
Notch
Middle Log
Metal Post
Grate
Groove Groove
Rear Log
Grate
Prong
Grate Prong
Groove in
Back of Log
Groove in
Back of Log

www.desatech.com
107172-01K 19
OPERATING FIREPLACE
FOR YOUR SAFETY
READ BEFORE LIGHTING
WARNING: If you do not fol-
low these instructions exactly,
a fire or explosion may result
causing property damage, per-
sonal injury or loss of life.
A. This appliance has a pilot which must be
lighted by hand. When lighting the pilot,
follow these instructions exactly.
B. BEFORE LIGHTING smell all around the
appliance area for gas. Be sure to smell next
to the floor because some gas is heavier than
air and will settle on the floor.
WHAT TO DO IF YOU SMELL GAS
• Do not try to light any appliance.
• Do not touch any electric switch; do not
use any phone in your building.
• Immediately call your gas supplier
from a neighborʼs phone. Follow the
gas supplierʼs instructions.
• If you cannot reach your gas supplier,
call the fire department.
C. Use only your hand to push in or turn the
gas control knob. Never use tools. If the
knob will not push in or turn by hand, donʼt
try to repair it, call a qualified service tech-
nician or gas supplier. Force or attempted
repair may result in a fire or explosion.
D. Do not use this appliance if any part has
been under water. Immediately call a
qualified service technician to inspect the
appliance and to replace any part of the
control system and any gas control which
has been under water.
LIGHTING
INSTRUCTIONS
WARNING: You must operate
this fireplace with the fireplace
screen in place. Make sure fire-
place screen is installed before
running fireplace.
NOTICE: During initial operation
of new heater, burning logs will
give off a paper-burning smell.
Orange flame will also be pres-
ent. Open damper or window to
vent smell. This will only last a
few hours.
1. STOP! Read the safety information,
column 1.
2. Make sure equipment shutoff valve is fully
open.
3. Set selector switch in OFF position.
WARNING: Burners will
come on automatically within
one minute when the selector
switch is in the ON position after
the pilot is lit.
4. Press in and turn control knob clockwise
to the OFF position.
5. Wait five (5) minutes to clear out any gas.
Then smell for gas, including near the floor.
If you smell gas, STOP! Follow “B” in the
safety information, column 1. If you donʼt
smell gas, go to the next step.
6. Press in and turn control knob counter-
clockwise to the PILOT position.
Press in control knob for five (5) seconds
(see Figure 32).
Note: You may be running this heater for
the first time after hooking up to gas sup-
ply. If so, the control knob may need to be
pressed in for 30 seconds or more. This will
allow air to bleed from the gas system.
CAUTION: Do not try to ad-
just heating levels by using the
equipment shutoff valve.
O
F
F
P
I
L
O
T
L
O
I
H
AUTO
OFF
ON
O
N
Figure 32 - Control Knob and Ignitor
Button Location (Shown as Supplied, No
Control Options)
Control Knob
Ignitor Button
Selector Switch
Flame Adjustment
Knob

www.desatech.com 107172-01K20
OPERATING FIREPLACE
Continued
7. With control knob pressed in, press and
release ignitor button. This will light pilot.
The pilot is attached to the front burner. If
needed, keep pressing ignitor button until
pilot lights.
Note: If pilot does not stay lit, contact a
qualified service person or gas supplier for
repairs. Until repairs are made, light pilot
with match. To light pilot with match, see
Manual Lighting Procedure.
8. Keep control knob pressed in for 30 seconds
after lighting pilot. After 30 seconds, release
control knob.
• If control knob does not pop out when
released, contact a qualified service
person or gas supplier for repairs.
Note: If pilot goes out, repeat steps 4
through 8.
9. Slightly push in and turn control knob coun-
terclockwise to the ON position.
10. Wait one minute and switch selector switch
to the ON position to light burners.
11. Set flame adjustment knob to any level
between HI and LO.
WARNING: Make sure the
selector switch is in the OFF
position when you are away from
home for long periods of time.
Heater will come on automati-
cally with selector switch in the
ON position.
TO TURN GAS OFF
TO APPLIANCE
Shutting Off Heater
1. Turn control knob clockwise to the
OFF position.
2a. Set selector switch in the OFF position.
2b. If Using Optional Hand-Held Remote: Set
selector switch in the OFF position to keep
from draining battery.
Shutting Off Burners Only (pilot stays lit)
You may shut off the burners and keep the pilot
lit by doing one of the following:
• Turn control knob clockwise to the
PILOT position.
• Use remote control manual OFF button.
• Set selector switch in the OFF position.
MANUAL LIGHTING
PROCEDURE
1. Follow steps 1 through 6 under Lighting
Instructions, page 19.
2. Depress control knob and light pilot with
match.
3. Keep control knob pressed in for 30 seconds
after lighting pilot. After 30 seconds, release
control knob. Now follow steps 9 through
11 under Lighting Instructions.
OPTIONAL HAND-HELD
REMOTE OPERATION
Note: All remote control accessories must be
purchased separately (see Accessories, page
34). Follow instructions included with the
remote control.
NOTICE: You must light the pilot
before using the hand-held re-
mote control unit. See Lighting
Instructions on page 19.
After lighting, let pilot flame burn for about
one minute. Turn control knob to ON posi-
tion. Adjust flame adjustment knob anywhere
between HI and LO. Slide the selector switch
to the REMOTE position (see Figure 35, page
21). Note: The burner may light if hand-held
remote was on when selector switch was last
turned off. You can now turn the burner on and
off with the hand-held remote control unit.
IMPORTANT: Do not leave the selector switch
in the REMOTE or ON position when the pilot
is not lit. This will drain the battery.
Figure 34 - Pilot (Propane/LP)
Ignitor
Electrode
Pilot Burner
Figure 33 - Pilot (Natural)
Pilot Burner Ignitor
Electrode