Desa EFS33NRB Quick start guide

Save this manual for future reference.
For more information, visit www.desatech.com
WARNING: If the information in this manual is not
followedexactly,afireorexplosionmayresultcausing
property damage, personal injury, or loss of life.
— Do not store or use gasoline or other flammable
vaporsandliquidsinthevicinityofthisoranyother
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.
• Immediatelycallyourgassupplierfromaneighbor’s
phone. Follow the gas supplier’s instructions.
• If you cannot reach your gas supplier, call the fire
department.
— Installationandservicemustbeperformedbyaquali-
fied installer, service agency, or the gas supplier.
UNVENTED (VENT-FREE) GAS FIREPLACE
OWNER’S OPERATION AND INSTALLATION MANUAL
EFS33PRB, EFS33NRB, VSGF33PRB AND VSGF33NRB
REMOTE-READY FIREPLACE SYSTEM
Shown with optional cabinet mantel, hearth base and trim accessories.

www.desatech.com 113132-01A
2
WARNING: Improper installation, adjustment, altera-
tion, service, or maintenance can cause injury or prop-
ertydamage.Refertothismanualforcorrectinstallation
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.
Provisions for adequate combustion and ventilation air
must be provided. Refer to Air for Combustion and
Ventilation section on page 5 of this manual.
This appliance may be installed in an aftermarket,*
permanently located, 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.
* Aftermarket: Completion of sale, not for purpose of resale, from the
manufacturer
TABLE OF CONTENTS
Safety Information ............................................... 3
Product Identification .......................................... 4
Local Codes ........................................................ 5
Unpacking ........................................................... 5
Product Features ................................................ 5
Air For Combustion and Ventilation .................... 5
Installation ........................................................... 8
Operating Fireplace .......................................... 17
Inspecting Burners ............................................ 20
Cleaning and Maintenance ............................... 21
Wiring Diagram ................................................. 22
Specifications .................................................... 22
Troubleshooting ................................................ 23
Replacement Parts ........................................... 27
Service Hints ..................................................... 27
Technical Service .............................................. 27
Illustrated Parts Breakdown and Parts List ....... 28
Accessories....................................................... 32
Warranty Information.......................... Back Cover

www.desatech.com
113132-01A 3
SAFETY INFORMATION
WARNING:Thisproductcon-
tainsand/orgenerateschemicals
known to the State of California
to cause cancer or birth defects,
or other reproductive harm.
IMPORTANT:Readthisowner’s
manualcarefullyandcompletely
beforetryingtoassemble,oper-
ate, or service this heater. Im-
proper use of this heater can
cause serious injury or death
fromburns,fire,explosion,elec-
trical shock, and carbon mon-
oxide poisoning.
DANGER:Carbonmonoxide
poisoning may lead to death!
Carbon Monoxide Poisoning: Early signs of car-
bon monoxide poisoning resemble the flu, with
headaches, 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 includepregnantwomen,people with
heart or lung disease or anemia, those under the
influence of alcohol, and those at high altitudes.
NaturalandPropane/LPGas:Natural andpropane/
LP gases 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 warn-
ings. Keep this manual for reference. It is your
guide to safe and proper operation of this heater.
WARNING: Any change to
thisheateroritscontrolscanbe
dangerous.
WARNING: Do not use a
blower insert, heat exchanger
insert, or other accessory not
approvedforusewiththisheater.
WARNING:Donotallowfans
toblowdirectlyintothefireplace.
Avoidanydraftsthatalterburner
flame patterns. Ceiling fans can
create drafts that alter burner
flame patterns. Altered burner
patterns can cause sooting.
Due to high temperatures, the
applianceshouldbelocatedout
of traffic and away from furni-
ture 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-
comeveryhotwhenrunningfire-
place. Keep children and adults
awayfromhotsurfacestoavoid
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
optional hand-held remote ac-
cessory,keepselectorswitchin
theOFFpositiontopreventchil-
dren from turning on burners
with remote.
You must operate this fireplace
with the fireplace screen and
hood in place. Make sure fire-
place screen and hood are in
place before running heater.
Keep the appliance area clear
and free from combustible ma-
terials,gasoline,andotherflam-
mable vapors and liquids.

www.desatech.com 113132-01A
4
SAFETY INFORMATION
Continued
1. This appliance is only for use with the type of
gas indicated on the rating plate. This appli-
anceis not convertiblefor use withothergases.
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
neighbor’s phone. Follow the gas supplier’s
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,
pages 21 and 22.
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
airisnot available. SeeAirforCombustion and
Ventilation,pages5through7.Iffireplacekeeps
shutting off, see Troubleshooting, pages 23
through 26.
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. Donotusefireplaceifany parthasbeenexposed
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.
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 servic-
ing. 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 pro-
pane/LP units, do not use propane/LP fuel
tanks of less than 100 lbs. capacity (pro-
pane/LP units only).
17. Provide adequate clearances around air
openings.
Optional
Remote Control
PRODUCT
IDENTIFICATION
Figure 1 - Log Base Assembly
(VSGF33NRB Shown)
Front
Log
Rear Log
Middle Log
Base Assembly
Front
Burner
Piezo
Ignitor
Rear
Burner
Optional
Blower
Assembly
(Not
Included)
Top Louver
Assembly
Fireplace
Hood
Bottom
Louver
Assembly
Screen
Assembly
Top Outer Casing
Firebox
Support
Figure 2 - Fireplace (VSGF33NRB Shown)

www.desatech.com
113132-01A 5
LOCAL CODES
Install and use fireplace with care. Follow all lo-
cal codes. In the absence of local codes, use the
latest edition of TheNational Fuel Gas CodeANSI
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 re-
quired, thermostat operation is not permitted.
UNPACKING
CAUTION: Do not remove
the data plates attached to the
heater base assembly. The data
plates contain important war-
ranty 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 pack-
ing. 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 abovetopcornersofthefire-
placescreen.Removeanddiscardthese screws.
Liftfireplace 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
Thisvent-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 elec-
tricity making it ideal for emergency backup heat.
SAFETY DEVICE
This fireplace has a pilot with an Oxygen Deple-
tion Sensing (ODS) safety shutoff system. The
ODS/pilot is a required feature for vent-free room
heaters. The ODS/pilot system shuts off the fire-
place if there is not enough fresh air.
PIEZO IGNITION SYSTEM
This fireplace has a piezo ignitor. This system re-
quires no matches, batteries, or other sources to
light fireplace.
OPTIONAL REMOTE CONTROL
ACCESSORY
Therearefouroptionalremotecontrols(notincluded)
that can be purchased separately for this log heater:
• wall switch
• wall thermostat
• hand-held ON/OFF remote
• hand-held thermostat remote
See Accessories, pages 32 through 34.
OPTIONAL BLOWER ASSEMBLY
ACCESSORY
This fireplace accepts an optional blower assem-
bly (not included). The GA3650T Series blower
operates thermostatically and features a variable
speed control. The GA3750 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 Accesso-
ries, pages 32 through 34.
AIR FOR COMBUSTION
AND VENTILATION
WARNING:Thisheatershall
not be installed in a confined
space or unusually tight con-
structionunlessprovisionsare
providedforadequatecombus-
tion and ventilation air. Read
thefollowinginstructionstoin-
sure proper fresh air for this
and other fuel-burning appli-
ances 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.

www.desatech.com 113132-01A
6
AIR FOR COMBUSTION
AND VENTILATION
Continued
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 5 through 7 will help you
classifyyour space andprovideadequateventilation.
Unusually Tight Construction
The air that leaks around doors and windows may
provide enough fresh air for combustion and ven-
tilation. 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 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 ar-
eas such as joints around window and
door frames, between sole plates and
floors, between wall-ceiling joints, be-
tween wall panels, at penetrations for
plumbing, electrical, and gas lines, and
at other openings.
If your home meets all of the three criteria
above,youmustprovideadditionalfreshair.
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 m3per kw) of the aggregate in-
put rating of all appliances installed in that space
and an unconfined space as a space whose vol-
ume is not less than 50 cubic feet per 1,000 Btu
per hour (4.8 m3per kw) of the aggregate input
rating of all appliances installed in that space.
Rooms communicating directly with the space in
which the appliances are installed*, through open-
ings not furnished with doors, are considered a
part of the unconfined space.
*Adjoiningroomsare communicatingonly if there
are doorless passageways or ventilation grills be-
tween them.
DETERMINING FRESH-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.
Space: Includes the room in which you will install
fireplace 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)
Example: Space size 20 ft. (length) x 16 ft.
(width)x 8 ft. (ceiling height) = 2,560 cu. ft. (vol-
ume of space)
If additional ventilation to adjoining room is sup-
plied 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 =
51,200 (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-ventdraws combustion air from the outdoors
and vents to the outdoors.
While it is good to make your home energy effi-
cient, 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.

www.desatech.com
113132-01A 7
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(maximumthespacecansupport)
________ Btu/Hr(actual amount of Btu/Hr used)
Example: 51,200 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 uncon-
finedspace, remove door toadjoiningroom 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.
If the actual Btu/Hr used is less than the maximum
Btu/Hr the space can support, the space is an un-
confined space. You will need no additional fresh
air ventilation.
WARNING: If the area in
which the heater may be oper-
atedissmallerthanthatdefined
asan unconfinedspaceorifthe
building is of unusually tight
construction, provide adequate
combustion and ventilation air
byoneofthemethodsdescribed
in the National Fuel Gas Code,
ANSI Z223.1/NFPA 54 Section
5.3 or applicable local codes .
AIR FOR COMBUSTION
AND VENTILATION
Continued
40,000
33,000
73,000
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 perma-
nent 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 op-
tion 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 4 - Ventilation Air from Outdoors
Figure 3 - Ventilation Air from Inside
Building
Outlet
Air Ventilated
Attic
Outlet
Air
Inlet
Air
Inlet Air Ventilated
Crawl Space
To
Crawl
Space
To Attic
;;;;;;
;;;;;;
;;;;;;
;;;;;;
;;;;;;
;;;;;;
;;;;;;
QQQQQQ
QQQQQQ
QQQQQQ
QQQQQQ
QQQQQQ
QQQQQQ
QQQQQQ







;;;;
;;;;
;;;;
;;;;
QQQQ
QQQQ
QQQQ
QQQQ




;;
;;
QQ
QQ


;;;;;
;;;;;
QQQQQ
QQQQQ


Or
Remove
Door into
Adjoining
Room,
Option
3
Ventilation Grills
Into Adjoining Room,
Option 2
Ventilation
Grills
Into Adjoining
Room,
Option 1
12"
12"
Ventilation Air From Outdoors
Provide extra fresh air by using ventilation grills
or ducts. You must provide two permanent open-
ings: 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-con-
trolled power vent. Heated air entering the attic
will activate the power vent.

www.desatech.com 113132-01A
8
INSTALLATION
NOTICE:Thisheaterisintended
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
centralheatingsystem,youmay
run system’s circulating blower
whileusingheater.Thiswillhelp
circulatetheheatthroughoutthe
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 fire-
place. 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
objectsarelessthan42inches
from the front, top, or sides of
the heater
• in high traffic areas
• in windy or drafty areas
CAUTION:Thisfireplacecre-
ates warm air currents. These
currents move heat to wall sur-
faces next to fireplace. Install-
ingfireplacenexttovinylorcloth
wall coverings or operating
heater where impurities (such
as, but not limited, to tobacco
smoke,aromaticcandles,clean-
ingfluids,oilorkerosenelamps,
etc.) in the air exist, may dis-
color 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, pages 11 and 12.
IMPORTANT: Vent-freeheaters add moisture to the
air. Although this is beneficial, installing fireplace
in rooms without enough ventilation air may cause
mildew to form from too much moisture. See Air
for Combustion and Ventilation, pages 5 through 7.
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.
WARNING: This appliance
is equipped for (natural or pro-
pane/LP) gas. Field conversion
is not permitted.
ELECTRICAL HOOKUP
(Models GA3750 Series and GA3650T
Series Blower Accessories, and GA3555
Internal Duplex Kit)
Thisfireplaceacceptsablowerassemblywithanelec-
trical 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
electricaloutlet within reach of fireplacepowercord.
The GA3555 outlet accessory may be used for built-
in applications with blower accessory installed.
INSTALLING HOOD
Install hood to rail already installed in fireplace as
shownin Figure 5. Use 3Phillips screws provided.
Figure 5 - Installing Hood
Screw
Hood
Rail

www.desatech.com
113132-01A 9
INSTALLATION
Continued
Figure 6 - Assembling Perimeter Trim
ASSEMBLING AND ATTACHING
OPTIONAL PERIMETER TRIM
(Included with Mantel Accessory)
IMPORTANT: If you are recessing the firebox in
a wall, do not attach trim at this time. See Built-In
Fireplace Installation, pages 11 and 12.
Note: Theinstructions below showassembling and
attaching trim to fireplace.
1. Remove packaging from three pieces of trim.
2. Locate four screws, two adjusting plates
with set screws, and two shims in the hard-
ware 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 trim (see Figure 6).
5. Slide other end of adjusting plate/shim in slot
on mitered edge of side trim (see Figure 6).
6. While firmly holding edges of trim together,
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 as-
sembled trim onto fireplace cabinet. Align
hanging notches on trim with hanging screws
on side of fireplace (see Figure 7). Push trim
firmlyinto place,sliding hanging notches over
hanging screws.
Side Trim
Slot
Mitered Edge
Slot
Shim
Set Screws
Adjusting
Plate
Assembled
Trim
Top
Trim
Figure 7 - Attaching Perimeter Trim to
Fireplace (VSGF33NRB Shown)
Trim
Hanging
Screws
Hanging
Notches
on Trim
INSTALLATION CLEARANCES
WARNING: Maintain the
minimumclearances.Ifyoucan,
providegreaterclearancesfrom
floor,ceiling,andadjoiningwall.
Carefully follow the instructions below. This will
ensure safe installation.
MinimumClearancesForSideCombustible
Material, Side Wall, and Ceiling
A. Clearances from the side of the fireplace cabi-
net 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 pro-
trudes 3 1/2" from the wall. This combustible
material must be 4" from the side of the fire-
place opening (see Figure 8).
B. Clearances from the top of the fireplace opening
to the ceiling should not be less than 42 inches.
MINIMUM CLEARANCE TO
COMBUSTIBLE MATERIALS
Top Left and Bottom
Right Sides and Rear
0" 16" 0"
*
*Minimum 16 inches from Side Wall
Example
Figure 8 - Minimum Clearance for
Combustible to Wall

www.desatech.com 113132-01A
10
INSTALLATION
Continued
4. Place hearth base accessory against wall at
installation location. Cut an access hole in
hearth top to run flexible gas line to fireplace
(seeFigure 9). Make sure tolocate access hole
so cabinet mantel will cover it when installed.
Note: You can secure base to floor using wood
screws.Countersink screwheadsandputtyover.
5. Route flexible gas line through access hole in
hearth base.
6. Center cabinet mantel on hearth base (see Fig-
ure10). Make suremantel is flushagainst 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 Fire-
place to Gas Supply, page 14.
10. If blower is installed, route blower electrical
cord through access holes in either side of fire-
place. Note: Bushing may be moved if neces-
sary. Plug electrical cord into electrical outlet.
CONVENTIONAL FIREPLACE
INSTALLATION
Conventionalinstallation of this fireplace involves
installing fireplace along with the corner, face, or
cabinetmantel with hearth base accessoriesagainst
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
G3333F/G3334U/G3004W/G3335F/G3007U se-
ries hearth base accessories. The hearth base ac-
cessory shown is optional for this installation.You
can install fireplace and cabinet/corner mantel di-
rectly on the floor. The corner mantel accessory
cannot be installed with the G3333F/G3334U/
G3004W/G3335F/G3007U hearth base. The cor-
ner 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
trimaccessories.Assembly instructionsare in-
cluded 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.
Ifpossible, locate outlet so cabinet mantel will
cover it when installed (see Figure 9).
3. Install gas piping to fireplace location. This
installation includes an approved flexible gas
line(if allowedby 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 Loca-
tion, pages 12 and 13.
Figure 10 - Installing Cabinet Mantel
Cabinet
Mantel
Figure 9 - Placing Hearth Base
Accessory Against Wall
Electrical Outlet
Hearth Base
Rigid Pipe and Gas
Shutoff Valve
Gas Line
Access Hole
Figure 11 - Location of Nailing Flanges
Nailing
Flanges

www.desatech.com
113132-01A 11
11. Carefully insert fireplace into cabinet mantel.
Becarefulnottoscratch or damage hearth base,
cabinet mantel, or any laminate trim on hearth
base. Remove protective material from top of
hearthbase and from front offireplace (if any).
Note: You can secure fireplace to hearth or
floor. Open lower louver. Locate screw holes
inbottom of base.Tightenwoodscrews through
these holes and into hearth or floor.
12. Check all gas connections for leaks. See
Checking Gas Connections, pages 15 and 16.
INSTALLATION
Continued
Figure 12 - Inserting Fireplace Into
Cabinet Mantel
;;;;;
;;;;;
QQQQQ
QQQQQ


;;;
;;;
;;;
;;;
;;;
QQQ
QQQ
QQQ
QQQ
QQQ





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 in-
stalling fireplace into a framed-in enclosure. This
makes the front of fireplace flush with wall. If in-
stallinga mantel above the fireplace, you must fol-
low the clearances shown in Figure 16, page 12.
Follow the instructions below to install the fire-
place in this manner.
1. Frameinroughopening.Usedimensions 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 outlet,
in fireplace. Follow instructions included in kit.
3. Install gas piping into fireplace location. This
installation includes an approved flexible gas
line(if allowedby 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 Loca-
tion, pages 12 and 13.
4. Carefully set fireplace in front of rough open-
ing with back of fireplace inside wall opening.
5. Carefully insert fireplace into rough opening.
6. Attach flexible gas line to gas supply. See
Connecting 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, pages 15 and 16.
9. Plug electrical cord into electrical outlet in-
stalled in step 2.
10. Install trim after final finishing and/or paint-
ing 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

www.desatech.com 113132-01A
12
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.
Mantel Clearances for Built-In
Installation
Ifplacing mantel abovebuilt-in fireplace, you must
meet minimum clearance between mantel shelf
and top of fireplace opening.
NOTICE:Ifyourinstallationdoes
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.Ifinstalledproperly,these
temperatures meet the require-
ment of the national product
standard. Follow all minimum
clearances shown in this
manual.
INSTALLING GAS PIPING TO
FIREPLACE LOCATION
WARNING: This appliance
requires a 1/2" NPT (National
PipeThread)inletconnectionto
the pressure regulator.
WARNING: A qualified ser-
vice person must connect fire-
place to gas supply. Follow all
local codes.
CAUTION:Neverconnectpro-
pane/LP fireplace directly to the
propane/LPsupply.Thisfireplace
requiresanexternalregulator(not
supplied).Installtheexternalregu-
lator 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 well-
head 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)
* ACSAdesign-certified equipment shutoff valve
with 1/8" NPT tap is an acceptable alternative to
test gauge connection. Purchase the optional CSA
design-certifiedequipment shutoffvalve from your
dealer. See Accessories, pages 32 through 34.

www.desatech.com
113132-01A 13
For propane/LP units, the installer must supply an
external regulator. The external regulator will re-
duce incoming gas pressure. You must reduce in-
coming 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 pro-
tects it from freezing rain or sleet.
CAUTION:Useonlynew,black
ironorsteelpipe.Internally-tinned
coppertubingmaybeusedincer-
tainareas.Checkyourlocalcodes.
Usepipeof1/2"diameterorgreater
toallowpropergasvolumetofire-
place. If pipe is too small, undue
loss of volume will occur.
Installationmust includeanequipmentshutoffvalve,
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
forturning on or shutting off the gas tothe appliance.
Check your building codes for any special re-
quirements for locating equipment shutoff valve
to fireplaces.
ApplypipejointsealantlightlytomaleNPTthreads.
This will prevent excess sealant from going into
pipe. Excess sealant in pipe could result in clogged
fireplacevalves. Never use sealant onflare threads.
INSTALLATION
Continued
Figure 17 - External Regulator on
Propane/LP Supply Tank with Vent
Pointing Down
External
Regulator Propane/LP
Supply Tank
Vent Pointing Down
* Purchase the optional CSA design-certified
equipment shutoff valve from your dealer. See
Accessories, pages 32 through 34.
** Minimum inlet pressure for purpose of input
adjustment.
WARNING: Use pipe joint
sealantthatisresistanttoliquid
petroleum (LP) gas.
We recommend that you install a sediment trap in
supply line as shown in Figure 18. Locate sedi-
ment trap where it is within reach for cleaning.
Install in piping system between fuel supply and
fireplace.Locate sedimenttrap where trapped mat-
ter is not likely to freeze. A sediment trap traps
moisture and contaminants. This keeps them from
going into fireplace gas controls. If sediment trap
is not installed or is installed wrong, fireplace may
not run properly.
Figure 18 - Gas Connection
3" Minimum
CSA Design-Certified
Equipment Shutoff Valve
With 1/8" NPT Tap*
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)
Sediment Trap
Cap Pipe Tee
Nipple Joint

www.desatech.com 113132-01A
14
➞
➞
INSTALLATION
Continued
CONNECTING FIREPLACE TO GAS
SUPPLY
Installation Items Needed
• 5/16" hex socket wrench or nut-driver
• Phillips screwdriver
• sealant(resistanttopropane/LPgas,notprovided)
1. Remove fireplace screen. Remove two screws
that hold fireplace screen in place for ship-
ping. 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 G8005 series brick liner ac-
cessory, install it now. Follow instructions in
G8005 accessory kit.
3. Route gas line (provided by installer) from
equipment shutoff valve to fireplace. Route
flexible gas supply line through one of the
access holes.
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, pages 15 and 16.
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.
CAUTION: Do not pick up
log base assembly by burner.
Thiscoulddamageburner.Only
handle base by grates.
NOTICE: Most building codes do
not permit concealed gas con-
nections. A flexible gas line is
provided to allow accessibility
fromthefireplace(seeFigure20).
The flexible gas supply line con-
nection to the equipment shutoff
valve should be accessible.
Figure 19 - Removing Log Base
Assembly From Fireplace
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
113132-01A 15
ON
POSITION
OFF
POSITION
2. Pressurize supply piping system by either
opening propane/LP supply tank valve for
propane/LP gas or opening main gas valve lo-
cated on or near gas meter for natural gas, or
using compressed air.
3. Check all joints from gas meter to equipment
shutoffvalvefornatural gas or propane/LPsup-
ply to equipment shutoff valve for propane/LP
(see Figures 22 and 23). Apply noncorrosive
leakdetection fluid to all joints. Bubbles form-
ing show a leak.
4. Correct all leaks at once.
CHECKING GAS CONNECTIONS
WARNING: Test all gas pip-
ing and connections, internal
and external to unit, for leaks
afterinstallingorservicing.Cor-
rect all leaks at once.
WARNING: Never use an
open flame to check for a leak.
Apply a noncorrosive leak de-
tectionfluidtoalljoints.Bubbles
forming show a leak. Correct all
leaks at once.
CAUTION: Make sure exter-
nal regulator has been installed
betweenpropane/LPsupplyand
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 equip-
ment 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 lo-
cated 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 fit-
tings for leaks.
Test Pressures Equal To or Less Than 1/2 PSIG
(3.5 kPa)
1. Close equipment shutoffvalve(see Figure 21).
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
Figure 22 - Checking Gas Joints for
Natural Gas
Gas Control Valve
Equipment Shutoff Valve
Equipment Shutoff Valve
Gas Meter
Gas Control Valve
Pressure Testing Fireplace Gas
Connections
1. Open equipment shutoffvalve (seeFigure 21).
2. Open main gas valve located on or near gas
meter for natural gas or open propane/LP sup-
ply tank valve.

www.desatech.com 113132-01A
16
INSTALLATION
Continued
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, page 15). Apply noncorrosive leak de-
tection fluid to all joints. Bubbles forming
show a leak.
5. Correct all leaks at once.
6. Light fireplace (see Operating Fireplace,
pages 17 through 20. Check all other internal
joints for leaks.
7. Turn off fireplace (see To Turn Off Gas to
Appliance, page 18).
INSTALLING LOGS (MODELS
EFS33NRB, EFS33PRB,
VSGF33NRB, AND VSGF33PRB)
WARNING:Failuretoposition
thepartsinaccordancewiththese
diagrams or failure to use only
parts specifically approved with
thisheatermayresultinproperty
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 sup-
plied 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 24). Push back
of logs flush with metal grate bars.
2. Rest middle log behind metal posts on grate
assembly. Make sure the grooves in the bot-
tom of the log fit over the grate. Bring the log
forwardnext to themetal posts (seeFigure 25).
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 26).
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 fire-
place (see Figure 27).
WARNING: You must oper-
ate this fireplace with the fire-
placescreeninplace.Makesure
fireplace screen is in place be-
fore running fireplace.
Figure 24 - Installing Front Log
Figure 26 - Installing Rear Log
Figure 25 - 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
Figure 27 - Installing Fireplace Screen
Notches
Screws for
Mounting Screen

www.desatech.com
113132-01A 17
NOTICE:Duringinitialoperation
of new fireplace, burning logs
will give off a paper-burning
smell. Open damper or window
to vent smell. This will only last
a few hours.
1. STOP! Read the safety information in
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
switchisintheONpositionafter
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.
Thensmell forgas,including nearthe floor.
If you smell gas, STOP! Follow “B” in the
safety information, column 1. If you don’t
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 28).
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
pressedin for30 seconds ormore.Thiswill
allow air to bleed from the gas system.
CAUTION: Do not try to ad-
just heating levels by using the
equipment shutoff valve.
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. BEFORELIGHTING smell all around the
applianceareaforgas. Besureto smell next
tothefloor becausesomegasisheavier than
air and will settle on the floor.
WHAT TO DO IFYOU 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 neighbor’s phone. Follow the gas
supplier’s instructions.
• Ifyou cannotreachyourgassupplier,call
the fire department.
C. Use only your hand to push in or turn the
gas control knob. Never use tools. If the
knobwillnotpushin orturn byhand, don’t
tryto repairit, call a qualifiedservicetech-
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
beenunderwater.Immediately calla quali-
fied service technician to inspect the appli-
ance and to replace any part of the control
system and any gas control which has been
under water.
LIGHTING
INSTRUCTIONS
WARNING: You must oper-
ate this fireplace with the fire-
placescreeninplace.Makesure
fireplace screen is installed be-
fore running fireplace.
O
F
F
P
I
L
O
T
O
N
L
O
I
H
AUTO
OFF
ON
Figure 28 - Control Knob and Ignitor
Button Location (Shown as Supplied, No
Control Options)
Control Knob
Ignitor Button
Selector Switch
Flame Adjustment
Knob

www.desatech.com 113132-01A
18
7. Withcontrol knobpressedin, pressand re-
lease 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 sec-
onds after lighting pilot. After 30 seconds,
release control knob.
• If control knob does not pop out when re-
leased, contact a qualified service person
or gas supplier for repairs.
Note: If pilot goes out, repeat steps 4
through 8 beginning on page 17.
9. Slightlypush inandturncontrolknobcoun-
terclockwise to the ON position.
10. Waitone minute and switchselector switch
to the ON position to light burners.
11. Set flame adjustment knob to any level be-
tween HI and LO.
WARNING: Make sure the
selector switch is in the OFF
positionwhenyouareawayfrom
home for long periods of time.
Heater will come on automati-
cally with selector switch in the
ON position.
Figure 30 - Pilot (Propane/LP)
Ignitor
Electrode
Pilot Burner
Figure 29 - Pilot (Natural)
Pilot Burner Ignitor
Electrode
OPERATING FIREPLACE
Continued
TO TURN OFF GAS
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 pi-
lot 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. Followsteps 1 through6 underLightingIn-
structions, page 17.
2. Depress control knob and light pilot with
match.
3. Keep control knob pressed in for 30 sec-
onds after lighting pilot. After 30 seconds,
release control knob. Now follow steps 9
through 11, column 1.
OPTIONAL HAND-HELD
REMOTE OPERATION
Note: All remote control accessories must be
purchasedseparately(see Accessories, pages32
through34 ). Followinstructions included with
the remote control.
NOTICE: You must light the pi-
lot before using the hand-held
remote control unit. See Light-
ing Instructions, page 17.
After lighting, let pilot flame burn for about
one minute. Turn control knob to ON position.
Adjust flame adjustment knob anywhere be-
tween HI and LO. Slide the selector switch to
theREMOTE position (seeFigure31, page 19).
Note: The burner may light if hand-held re-
mote was on when selector switch was last
turnedoff.Youcannowturn theburneron 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.

www.desatech.com
113132-01A 19
Figure 31 - Setting the Selector Switch,
Control Knob, and Flame Adjustment
Knob for Hand-Held Remote Operation
Selector Switch in Remote
Position (Optional Hand-
Held Remote Control)
Flame Adjustment Knob
Control Knob
in On Position
O
F
F
P
I
L
O
T
O
N
L
O
I
H
ON
OFF
REMOTE
OPERATING FIREPLACE
Continued
ON/OFF MODEL GHRCB
Holdthecontrolbutton onthehand-heldremote
until burner turns on. Hold the control button
again until burner turns off (see Figure 32).
TO LOCK press both buttons on hand-held re-
mote control until light stops flashing. Hand-
held remote control is now locked. If the fire is
on it will be turned off automatically. In the
locked state, the light will not light up when
any button is pressed.
TO UNLOCK press both buttons together on
hand-held remote control until the light stops
flashing.Thehand-heldremoteisnowunlocked.
Figure 32 - On/Off Hand-Held Remote
Control Unit
Control Button
Turns Burners
On and Off
THERMOSTAT MODEL GHRCTB
The hand-held remote can be operated using
either the manual mode (MANU) or thermo-
static mode (AUTO) (see Figure 33). To select
Fahrenheit/Centigrademodedisplay,carefully
press the ˚C/˚F mode button with the end of a
paper clip or similar blunt object.
Manual Mode
1. Press the POWER and LOCK buttons to-
gether to turn on the hand-held remote
control.
2. Press the MANU button to turn on the
fireplace.
3. Press the POWER and LOCK buttons to-
gether to turn off the fireplace.
Auto (Thermostatic) Mode
1. Press the POWER and LOCK buttons to-
gethertoturn onthehand-heldremotecon-
trol.
2. Press AUTO button to select this mode.
3. Setthe desiredroomtemperatureby press-
ing the TEMP+ or - buttons.
4. Press the POWER and LOCK buttons to-
gether to turn off the fireplace
Note: Do not leave thehand-held remotein the
AUTO mode close to the fireplace. The radiant
heat from the fireplace will turn off the fire-
place.Ideally, placethehand-held remoteinthe
centerof the roomfacing towards thefireplace.
Note: Do not hold the hand-held remote for a
long time. Body temperature will affect its op-
eration in theAUTO mode.
Turns Hand-
Held Remote
On or Off and
Allows You to
Choose the
Manual
Setting
Selects Auto
Setting
Increases
Room
Temperature
in AUTO
Mode
Digital
Display
Shows
Temperature
and
Settings
Turns
Burners On
or Off
Decreases
Room
Temperature
in AUTO
Mode
Safety Features
When away from home foran extended period
of time or as a child safety feature to prevent
accidentalignition of the fireplace,the receiver
ON/OFF/REMOTE switch should be in the
OFF position.
Auto Shutoff Feature
1. If the average room temperature exceeds
82 degrees Fahrenheit (28 degrees Centi-
grade), the hand-held remote control will
performa safety overrideand shut thefire-
place off. This feature is not available in
the MANU mode.
Figure 33 - Thermostat Hand-Held
Remote Control Unit Selections GHRCTB
Locks System
to Prevent
Accidental Ignition

www.desatech.com 113132-01A
20
2. The receiver continuously receives signals
from the hand-held remote to control the
roomtemperature.If thehand-held remote
is misplaced, obstructed, or for any reason
cannottransmit tothe receiver,the receiver
will shut off the fireplace after 8 minutes.
Key Pad Lock Feature
This feature allows the user to lock/unlock the
keypad on the hand-held remote in the MANU
or AUTO mode to prevent inadvertent opera-
tion (i.e. children operating the hand-held re-
mote control, etc.). The keypad is locked in ei-
ther on or off. Press the POWER and LOCK
buttons together to turn the unit on or off.
OPTIONAL BLOWER
OPERATION
WARNING:Thisfireplacehas
athree-prong,groundedelectri-
calplug.Thisplughelpsprotect
you against electrical shock.
Only connect plug to a properly
grounded, three-prong recep-
tacle. Do not cut or remove the
groundingprongfromthisplug.
Locatethe blower switchbyopening lower lou-
ver on fireplace. Blower switch is located at
lower left inside louver door.
The GA3650TB thermostat-controlled blower
has a variable speed control with an ON/OFF
switch.The blower will start when the thermo-
stat senses a sufficient increase in firebox tem-
perature.The GA3750Avariable speed blower
also has an ON/OFF switch built into the vari-
able speed control.
Note for GA3650TB Only: If you are using
GA3650TB blower, your fireplace and blower
will not turn on and off at the same time. The
fireplace may run for several minutes before
theblowerturns on.Afterthe heatermodulates
tothe pilot position, the blower willcontinue to
run. The blower will shut off after the firebox
temperature decreases.
Note: It is safetooperate fireplacewithblower
turned off. However, the blower helps distrib-
ute heated air from the fireplace.
Follow installation instructions included with
the blower accessory.
OPERATING FIREPLACE
Continued
INSPECTING BURNERS
Check pilot flame pattern and burner flame pat-
terns often.
PILOT FLAME PATTERN
Figure 34 shows a correct pilot flame pattern. Fig-
ure 35 shows an incorrect pilot flame pattern. The
incorrect pilot flame is not properly heating the
thermocouple. When the thermocouple cools, the
heater will shut down.
If pilot flame pattern is incorrect, as shown in
Figure 35
• turn heater off (see To Turn Off Gas to Appli-
ance, page 18)
• see Troubleshooting, pages 23 through 26
Note: The pilot flame on natural gas units will
have a slight curve, but flame should be blue and
have no yellow or orange color.
Figure 34 - Correct Pilot Flame Pattern
Figure 35 - Incorrect Pilot Flame Pattern
Pilot Burner Thermocouple
Thermocouple
Pilot Burner
MAIN BURNER
Periodically inspect all burner flame holes with
the heater running.All slotted burner flame holes
should be open with yellow flame present. All
round burner flame holes should be open with a
smallblue flame present. Some burner flame holes
may become blocked by debris or rust, with no
flame present. If so, turn off heater and let cool.
Remove blockage. Blocked burner flame holes
may create soot.
FRONT BURNER FLAME PATTERN
WARNING: If front burner
flame pattern shows yellow tip-
ping, your fireplace could pro-
duceincreasedlevelsofcarbon
monoxide. Follow instructions
below. Yellow flame on rear
burner is normal.