Desa HRB3624 Quick start guide

For more information, visit www.desatech.com
WARNING: If the information in this manual is not fol-
lowed exactly, a re or explosion may result causing
property damage, personal injury or loss of life.
— Do not store or use gasoline or other ammable
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 re
department.
— Installation and service must be performed by a quali-
ed installer, service agency or the gas supplier.
INSTALLER: Leave this manual with the appliance.
CONSUMER: Retain this manual for future reference.
UNVENTED (VENT-FREE) GAS LOG HEATER
OWNER’S OPERATION AND INSTALLATION MANUAL
Remote-Ready Models VUL18/24/30(N,P)R, HRB3930/3924(N,P)R
and CRB2618/3624/3630(N,P)R
Thermostatically-Controlled Models VUL18/24/30(N,P)T and
HRB3624(N,P)T
Remote-Ready Models Also Design-Certied As
Vented Decorative Appliances

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SAFETy INFORMATION
TAbLE OF CONTENTS
Safety Information ............................................... 2
Product Identication........................................... 5
Local Codes......................................................... 5
Optional Remote Control Accessories................. 5
Unpacking............................................................ 5
Product Features................................................. 5
Air For Combustion and Ventilation ..................... 6
Installation ........................................................... 8
Operating Heater............................................... 20
Inspecting Burners............................................. 25
Cleaning and Maintenance................................ 26
Wiring Diagram.................................................. 27
Troubleshooting................................................. 28
Optional Positioning of Thermostat
Sensing Bulb ................................................. 32
Specications .................................................... 33
Illustrated Parts Breakdown and Parts List........ 34
Service Hints ..................................................... 42
Technical Service............................................... 42
Replacement Parts............................................ 42
Accessories ....................................................... 42
Warranty Information ...........................Back Cover
WARNING: Improper in-
stallation, adjustment, al-
teration, service or main-
tenance can cause injury
or property damage. Refer
to this manual for correct
installation and operation-
al procedures. For assis-
tance or additional infor-
mation consult a qualied
installer, service agency
or the gas supplier.
WARNING: This appliance
is for installation only in a
solid-fuel burning mason-
ry or UL127 factory-built
replace or in a listed vent-
less rebox enclosure. It is
design-certied for these
installationsinaccordance
with ANSI Z21.11.2. Excep-
tion: Do not install this
appliance in a factory-built
fireplace that includes
instructions stating it has
not been tested or should
not be used with unvented
gas logs.
WARNING: This is an
unvented gas-red heat-
er. 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 Ven-
tilation section on page 6
of this manual.
This appliance may be in-
stalled in an aftermarket,*
permanently located,
manufactured (mobile)
home, where not prohib-
ited 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

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119426-01A 3
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 replace.
Improper use of this replace
can cause serious injury or
death from burns, re, 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 u, with head-
aches, dizziness or nausea. If you have these signs,
the replace may not be working properly. Get
fresh air at once! Have replace 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
inuence of alcohol and those at high altitudes.
Natural and Propane/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 warnings.
Keep this manual for reference. It is your guide to
safe and proper operation of this replace.
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.
SAFETy INFORMATION
Continued WARNING: Do not allow fans
to blow directly into the replace.
Avoid any drafts that alter burner
ame patterns. Ceiling fans can
create drafts that alter burner
ame patterns. Altered burner
patterns can cause sooting.
Due to high temperatures, the
appliance should be located out
of trafc and away from furniture
and draperies.
Do not place clothing or other
ammable material on or near
the appliance. Never place any
objects on the heater.
Heater base assembly becomes
very hot when running heater.
Keep children and adults away
from hot surface to avoid burns
or clothing ignition. Heater
will remain hot for a time after
shutdown. Allow surface to cool
before touching.
Carefully supervise young chil-
dren when they are in the room
with heater. When using the hand-
held remote accessory (Remote-
Ready Models Only), keep selec-
tor switch in the OFF position to
prevent children from turning on
burners with remote.
You must operate this heater
with the replace screen and
hood in place. Make sure re-
place screen and hood are in
place before running heater.
Keep the appliance area clear
and free from combustible ma-
terials, gasoline and other am-
mable vapors and liquids.

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SAFETy INFORMATION
Continued
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
neighbor’s phone. Follow the gas supplier’s
instructions
• if you cannot reach your gas supplier, call
the re department
4. This heater shall not be installed in a bedroom
or bathroom, unless installed as a vented appli-
ance. See Installing Damper Clamp Accessory
for Vented Operation, page 12 (Remote-Ready
Models Only).
5. Before installing in a solid fuel burning
replace, the chimney ue and rebox must
be cleaned of soot, creosote, ashes and loose
paint by a qualied chimney cleaner. Creosote
will ignite if highly heated. A dirty chimney
ue may create and distribute soot within
the house. Inspect chimney ue for damage.
If damaged, repair ue and rebox before
operating heater.
6. Do not burn solid-fuel in a masonry or UL127
factory-built replace in which a vent-free
room heater is installed.
7. If replace has glass doors, never operate this
heater with glass doors closed. If you operate
heater with doors closed, heat buildup inside
replace will cause glass to burst. Make sure
there are no obstructions across openings of
replace.
8. To prevent the creation of soot, follow the
instructions in Cleaning and Maintenance,
page 26.
9. 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 and furniture.
10. This heater needs fresh, outside air ventilation
to run properly. This heater has an Oxygen
Depletion Sensing (ODS) safety shutoff system.
The ODS shuts down the heater if enough fresh
air is not available. See Air for Combustion and
Ventilation, page 6. If heater keeps shutting off,
see Troubleshooting, page 28.
11. Do not run heater
• where ammable liquids or vapors are used
or stored
• under dusty conditions
12. Do not use this heater to cook food or burn
paper or other objects.
13. Do not use heater if any part has been exposed
to or under water. Immediately call a qualied
service technician to inspect the room heater
and to replace any part of the control system
and any gas control which has been under
water.
14. Do not operate heater if any log is broken. Do
not operate heater if a log is chipped (dime-
sized or larger).
15. Turn heater off and let cool before servicing,
installing or repairing. Make sure the selector
switch is in the OFF position (Remote-Ready
Models Only). Only a qualied service person
should install, service or repair heater.
16. Make sure the selector switch is in the OFF
position when you are away from home for
long periods of time (Remote-Ready Models
Only).
17. Remote-ready heaters must not be connected
to any external electrical source.
18. Operating heater above elevations of 4,500
feet may cause pilot outage.
19. To prevent performance problems, do not
use propane/LP fuel tank of less than 100 lb.
capacity (propane/LP units only).
20. Provide adequate clearances around air
openings.
UNPACkING
CAUTION: Do not remove the
data plates from the grate assembly.
The data plates contain important
warranty and safety information.
1. Remove logs and heater base assembly from
carton. Note: Do not pick up heater base as-
sembly by burners. This could damage heater.
Always handle base assembly by grate.
2. Remove all protective packaging applied to
logs and heater for shipment.
3. Check all items for any shipping damage. If
damaged, promptly inform dealer where you
bought heater.

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119426-01A 5
PRODUCT
IDENTIFICATION
Figure 1 - Product Identication
Base
Assembly
Control Knob
Ignitor
Model VUL
Series Logs
Control
Knob Base
Assembly
Ignitor
Rear Burner
Flame
Adjustment
Knob
Remote
Control
(Optional)
OPTIONAL REMOTE
CONTROL ACCESSORIES
There are four optional remote controls that
can be purchased separately for Remote-Ready
Models Only:
• wall switch • hand-held ON/OFF remote
• wall thermostat • hand-held thermostat remote
See Accessories, page 42.
The wall thermostat or hand-held thermostat may not
be used where vented decorative listing is required.
PRODUCT FEATURES
OPERATION
This heater 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 ames
and glowing coals. This heater is designed for vent-
free operation with ue damper closed. It has been
tested and approved to ANSI Z21.11.2 standard for
unvented heaters. State and local codes in some
areas prohibit the use of vent-free heaters. This
heater may also be operated as a vented decorative
(ANSI Z21.60) product by opening the ue damper
(Non-Thermostat Models Only).
SAFETY DEVICE
This heater 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 shuts off the heater if there
is not enough fresh air.
ELECTRONIC IGNITION SYSTEM
This heater has an electronic ignitor to light heater
fuel supply.
Model CRB and
HRB Series Logs
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
State of Massachusetts: The installa-
tion must be made by a licensed plumber
or gas fitter in the Commonwealth of
Massachusetts.
Sellers of unvented propane or natural
gas-red 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
Commonwealth of Massachusetts.

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AIR FOR COMbUSTION
AND VENTILATION
WARNING: This heater shall
not be installed in a conned
space or unusually tight construc-
tion unless provisions are provid-
ed for adequate combustion and
ventilation air. Read the following
instructions to insure proper fresh
air for this and other fuel-burning
appliances in your home.
Today’s homes are built more energy efcient
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 ef-
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, replaces, 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 classications:
1. Unusually Tight Construction
2. Unconned Space
3. Conned Space
The information on pages 6 through 8 will help
you classify your space and provide adequate
ventilation.
Unusually Tight Construction
The air that leaks around doors and windows
may provide enough fresh air for combustion and
ventilation. However, in buildings of unusually
tight construction, you must provide additional
fresh air.
Unusually tight construction is dened 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 oors, 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 8.
If your home does not meet all of the
three criteria above, proceed to Determin-
ing Fresh-Air Flow For Heater Location,
below.
Conned and Unconned Space
The National Fuel Gas Code, ANSI Z223.1/NFPA
54 denes a conned 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 unconned 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
unconned 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 Conned or
Unconned Space
Use this work sheet to determine if you have a
conned or unconned space.

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119426-01A 7
AIR FOR COMbUSTION
AND VENTILATION
Continued
Space: Includes the room in which you will install
replace 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) = 2560 cu. ft.
(volume of space)
If additional ventilation to adjoining room is
supplied with grills or openings, add the volume
of these rooms to the total volume of the space.
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: 2560 cu. ft. (volume of space) x 20 =
51,200 (maximum Btu/Hr the space can support)
3. Add the Btu/Hr of all fuel burning appliances in
the space.
Vent-free replace ___________ Btu/Hr
Gas water heater* ___________ Btu/Hr
Gas furnace ___________ Btu/Hr
Vented gas heater ___________ Btu/Hr
Gas replace 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 replace + __________ 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: 51,200 Btu/Hr (maximum the space
can support)
73,000 Btu/Hr (actual amount of
Btu/Hr used)
The space in the above example is a conned space
because the actual Btu/Hr used is more than the maxi-
mum Btu/Hr the space can support. You must provide
additional fresh air. Your options are as follows:
A. Rework worksheet, adding the space of an adjoin-
ing room. If the extra space provides an unconned
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, page 8.
C. Install a lower Btu/Hr replace, if lower Btu/Hr
size makes room unconned.
If the actual Btu/Hr used is less than the maximum
Btu/Hr the space can support, the space is an un-
conned 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 dened
as an unconned 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/NFPA54 Section 5.3
or applicable local codes.
VENTILATION AIR
Ventilation Air From Inside Building
This fresh air would come from an adjoining un-
conned space. When ventilating to an adjoining
unconned space, you must provide two perma-
nent openings: one within 12" of the ceiling and
one within 12" of the oor on the wall connecting
the two spaces (see options 1 and 2, Figure 2). You
can also remove door into adjoining room (see
option 3, Figure 2). Follow the National Fuel Gas
Code, ANSI Z223.1/NFPA 54, Section 5.3, Air for
Combustion and Ventilation for required size of
ventilation grills or ducts.
40,000
33,000
73,000
Figure 2 - 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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AIR FOR COMbUSTION
AND VENTILATION
Continued
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 oor. Connect these items directly to the
outdoors or spaces open to the outdoors. These
spaces include attics and crawl spaces. Follow the
National Fuel Gas Code, ANSI Z223.1/NFPA 54,
Section 5.3, Air for Combustion and Ventilation for
required size of ventilation grills or ducts.
IMPORTANT: Do not provide openings for inlet
or outlet air into attic if attic has a thermostat-
controlled power vent. Heated air entering the attic
will activate the power vent.
Figure 3 - Ventilation Air from Outdoors
Outlet
Air
Ventilated
Attic
Outlet
A
ir
Inlet
Air
Inlet Air Ventilated
Crawl Space
To
Crawl
Space
To Attic
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 qualied ser-
vice person must install heater.
Follow all local codes.
NOTICE: State or local codes
may only allow operation of this
appliance in a vented congura-
tion. Check your state or local
codes.
WARNING: Make sure the
selector switch is in the OFF
position before installing heater
(Remote-Ready Models Only).
WARNING: Before installing
in a solid fuel burning replace,
the chimney ue and rebox
must be cleaned of soot, creo-
sote, ashes and loose paint by
a qualified chimney cleaner.
Creosote will ignite if highly
heated. A dirty chimney ue may
create and distribute soot within
the house. Inspect chimney and
rebox ue for damage. If dam-
aged, repair ue and rebox
before operating heater.
WARNING: Seal any fresh
air vents or ash clean-out doors
located on oor or wall of re-
place. If not, drafting may cause
pilot outage or sooting. Use a
heat-resistant sealant. Do not
seal chimney ue damper.
WARNING: Never install the
heater
• in a bedroom or bathroom
unless installed as a vented
appliance, see page 12 (Re-
mote-Ready Models Only)
• in a recreational vehicle
• where curtains, furniture, cloth-
ing or other ammable objects
are less than 42" from the front,
top or sides of the heater
• in high trafc areas
• in windy or drafty areas

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119426-01A 9
MINIMUM FIREPLACE CLEARANCE TO
COMBUSTIBLE MATERIALS
Log Size 18", 24", 30"
Side Wall 16"
Ceiling 42"
Floor 5"
LOG SIZING REQUIREMENTS
Minimum Firebox Size
Log Front Rear*
Size Height Depth Width Width
18" 17" 14" 20" 14"
24" 17" 14" 26" 18"
30" 17" 14" 32" 22"
*Measured at 14" depth
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 u-
ids, oil or kerosene lamps, etc.) in
the air exist, may discolor walls
or cause odors.
IMPORTANT: Vent-free heaters add moisture to
the air. Although this is benecial, installing heater
in rooms without enough ventilation air may cause
mildew to form from too much moisture. See Air
for Combustion and Ventilation, page 6.
CHECK GAS TYPE
Use the correct type of gas (natural or propane/LP).
If your gas supply is not the correct gas type, do
not install heater. Call dealer where you bought
heater for proper type heater.
WARNING: This appliance
is equipped for natural or pro-
pane/LP gas. Field conversion
is not permitted.
INSTALLATION AND CLEARANCES
FOR VENT-FREE OPERATION
WARNING: Maintain the
minimum clearances. If you
can, provide greater clearances
from oor, ceiling and adjoining
wall.
INSTALLATION
Continued
Carefully follow the instructions below. This will
ensure safe installation into a masonry, UL127-
listed manufactured replace or listed vent-free
rebox.
Minimum Clearances For Side
Combustible Material, Side Wall and
Ceiling
A. Clearances from the side of the fireplace
cabinet to any combustible material and wall
should follow diagram in Figure 4.
Example: The face of a mantel, bookshelf,
etc. is made of combustible material and
protrudes 3 1/2" from the wall. This combus-
tible material must be 4" from the side of the
replace cabinet (see Figure 4).
Note: When installing your gas logs into
a manufactured firebox, follow firebox
manufacturer’s instructions for minimum
clearances to combustible materials.
B. Clearances from the top of the fireplace
opening to the ceiling should not be less than
42".
Figure 4 - Minimum Clearance for
Combustible to Wall
*Minimum 16" from Side Wall
*
Example

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INSTALLATION
Continued
NOTICE: Manual control heaters
may be used as a vented product.
If so, you must always run heater
with chimney ue damper open.
If running heater with damper
open, noncombustible material
above replace opening is not
needed. Go to Installing Damper
Clamp Accessory for Vented
Operation, page 12.
Minimum Noncombustible Material
Clearances
If Not Using Mantel
Note: If using a mantel proceed to If Using Mantel.
If not using a mantel, follow the information on
this page.
You must have noncombustible material(s) above
the replace opening. Noncombustible materials
(such as slate, marble, tile, etc.) must be at least
1/2" thick. With sheet metal, you must have non-
combustible material behind it. Noncombustible
material must extend at least 8" up (for all models).
If noncombustible material is less than 12", you
must install the replace hood accessory (24" and
30" Models Only). See Figure 5 for minimum
clearances.
If Using Mantel
You must have noncombustible material(s) above
the replace opening. Noncombustible materials
(such as slate, marble, tile, etc.) must be at least
1/2" thick. With sheet metal, you must have non-
combustible material behind it. Noncombustible
material must extend at least 8" up (for all models).
If noncombustible material is less than 12", you
must install the replace hood accessory (24"
and 30" Models Only). Even if noncombustible
material is more than 12", you may need the hood
accessory to deect heat away from your mantel
shelf. See Figure 5 and Figures 6 and 7, page 9,
for minimum clearances.
IMPORTANT: If you cannot meet these minimum
clearances, you must operate heater with chimney
ue damper open. Go to Installing Damper Clamp
Accessory for Vented Operation, page 12.
Heat Resistant
Material
(A)
Figure 5 - Heat Resistant Material (Slate,
Marble, Tile, etc.) Above Fireplace
Noncombustible
Material Requirements for
Distance (A) Safe Installation
1 2" or more Noncombustible mate-
rial OK.
Between 8" and 12" 24" or 30" Models:
Install fireplace hood
accessory (GA6050,
GA6052 or GA6053 see
Accessories, page 42).
18" Model: Noncombus-
tible material OK.
Less than 8" Noncombustible mate-
rial must be extended to
at least 8". See Between
8" and 12", above. If you
cannot extend material,
you must operate heater
with ue damper open.
MANTEL CLEARANCES
In addition to meeting noncombustible material
clearances, you must also meet required clearances
between replace opening and mantel shelf. If
you do not meet the clearances listed below, you
will need a hood.
Determining Minimum Mantel Clearance
If you meet minimum clearance between mantel
shelf and top of replace opening, a hood is not
required (see Figure 6, page 11).
Determining Minimum Mantel Clearance
When Using a Hood
If minimum clearances in Figure 6, page 11, are
not met, you must have a hood. When using a hood
there are still certain minimum mantel clearances
required. Follow minimum clearances shown in
Figure 7, page 11, when using hood.

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119426-01A 11
INSTALLATION
Continued
NOTICE: Surface temperatures
of adjacent walls and mantels be-
come hot during operation. Walls
and mantels above the rebox
may become hot to the touch.
If installed properly, these tem-
peratures meet the requirement
of the national product standard.
Follow all minimum clearances
shown in this manual.
NOTICE: If your installation does
not meet the minimum clear-
ances shown, you must do one
of the following:
• operate the logs only with the
ue damper open
• raise the mantel to an accept-
able height
• remove the mantel
Figure 6 - Minimum Mantel Clearances
Without Using Hood
14"
Min.
Combustible
Material
Noncombustible Material
Figure 8 - Minimum Fireplace Clearances
If Installed at Floor Level
Figure 7 - Minimum Mantel Clearances
When Using Hood
Minimum Non-
Combustible
Material
Minimum Non-
Combustible
Material Height
Distances to
Underside of
Mantel
Top of
Fireplace
Opening
Underside of
Mantel Shelf
12"
8"
(A)
18"
14"
20"
17"
22"
19"
24"
20"
All minimum
distances are
in inches
Log Set
24"/30"/36"
Models
18" Model
2
1/2
"
6"
8"
10"
Mantel Shelf
Minimum
Noncombustible
Material
8"
Min.
12" 15" 18"
All minimum
distances are
in inches
Log Sets
18", 24",
& 30"
Models
20"
2
1/2
"
6"
8"
10"
12"
Distances to
Underside of
Mantel
Hood
(GA6050,
GA6052,
or GA6053)
Top of
Fireplace
Opening
Underside of
Mantel Shelf
Mantel Shelf
FLOOR CLEARANCES
A. If installing appliance on the oor level, you
must maintain the minimum distance of 14"
to combustibles (see Figure 8).
B. If combustible materials are less than 14" to
the replace, you must install appliance at
least 5" above the combustible ooring (see
Figure 9).
Hearth
5"
Min.
Combustible
Material
Figure 9 - Minimum Fireplace Clearances
Above Combustible Flooring

www.desatech.com 119426-01A12
INSTALLATION
Continued
INSTALLING DAMPER CLAMP
ACCESSORY FOR VENTED
OPERATION
Note: When used as a vented heater, appliance
must be installed only in a solid-fuel burning
replace with a working ue and constructed of
noncombustible material.
If your heater is a manually-controlled model, you
may use this heater as a vented product. There
are three reasons for operating your heater in the
vented mode.
1. The replace does not meet the clearance
to combustibles requirements for vent-free
operation.
2. State or local codes do not permit vent-free
operation.
3. You prefer vented operation.
If reasons number 1 or 2 above apply to you, you
must permanently open chimney ue damper. You
must install the damper clamp accessory (to order,
see Accessories, page 42). This will insure vented
operation (see Figure 10). The damper clamp will
keep damper open. Installation instructions are
included with clamp accessory.
See chart below for minimum permanent ue
opening you must provide. Attach damper clamp
so the minimum permanent ue opening will be
maintained at all times.
Area of Various Standard Round Flues
Diameter Are
5" 20 sq. inches
6" 29 sq. inches
7" 39 sq. inches
8" 51 sq. inches
Chimney Minimum Permanent
Height Flue Opening
6' to 15' 39 sq. inches
15' to 30' 29 sq. inches
Damper
Damper
Clamp
Damper
Damper
Clamp
Damper
Figure 10 - Attaching Damper Clamp
Manufactured Fireplace
Masonry Fireplace
INSTALLING HEATER BASE
ASSEMBLY
WARNING: You must secure
this heater to replace oor. If
not, heater will move when you
adjust controls. Moving heater
may cause a gas leak.
WARNING: If installing in a
sunken replace, special care
is needed. You must raise the
replace oor to allow access to
heater control panel. This will in-
sure adequate air ow and guard
against sooting and controls be-
ing damaged. Raise replace oor
with noncombustible material.
Make sure material is secure.
CAUTION: Do not pick up
heater base assembly by burn-
ers. This could damage heater.
Only handle base assembly by
grates.

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119426-01A 13
INSTALLATION
Continued
IMPORTANT: Make sure the heater burners are
level. If heater is not level, heater will not work
properly. For thermostat models, avoid damage
to thermostat bulb. Avoid nicks or sharp bends
in thermostat bulb wire. Keep thermostat bulb
in mounting bracket until ready to mount base
to oor. See Optional Positioning Of Thermostat
Sensing Bulb, page 32.
Installation Items Needed
• hardware package (provided with heater)
• approved exible gas hose and ttings (not
provided) (if allowed by local codes)
• sealant (resistant to propane/LP gas, not pro-
vided)
• electric drill with 3/16” masonry drill bit
Note: Install optional GHRCTB Receiver and
Hand-Held Remote Control Kit (see Accessories,
page 42) before installing gas log heater (Remote-
Ready Models Only). See installation instructions
included with the kit.
1. Apply pipe joint sealant lightly to male threads
of gas tting (not provided). For Thermostati-
cally-Controlled Models connect approved
exible gas hose to gas regulator of heater
(see Figure 11). For Remote-Ready models
connect approved exible gas hose to inlet
side of gas control (see Figure 12). IMPOR-
TANT: Hold gas regulator with wrench when
connecting exible gas hose (Thermostati-
cally-Controlled Models Only).
2. Position heater base assembly in replace.
3. Mark screw locations through holes in front
panel of base (see Figure 13). If installing in a
brick-bottom replace, mark screw locations
in mortar joint of bricks.
4. Remove heater base from replace.
5. Drill holes at marked locations using 3/16"
drill bit.
6. Attach base, through holes in front panel of base,
to replace oor using masonry screws provided
in hardware package (see Figure 13).
7. Connect to gas supply. See Connecting To Gas
Supply, page 14.
Heater Gas
Regulator
Flexible Gas Hose (if
allowed by local codes)
Figure 11 - Attaching Flexible Gas Hose to
Heater Gas Regulator (Thermostatically-
Controlled Models Only)
Figure 12 - Attaching Flexible Gas Hose
to Heater Gas Regulator
(Remote-Ready Models Only)
Gas Control
Flexible Gas Hose
(if allowed by local
codes)
Figure 13 - Attaching Base to Fireplace
Floor (Remote-Ready Models Only)
Masonry Screw

www.desatech.com 119426-01A14
CONNECTING TO GAS SUPPLY
WARNING: This appliance
requires a 1/2" NPT (National
Pipe Thread) inlet connection to
the pressure regulator.
WARNING: A qualied ser-
vice person must connect heater
to gas supply. Follow all local
codes.
CAUTION: Never connect
propane/LP replace directly
to the propane/LP supply. This
heater requires an external regu-
lator (not supplied). Install the
external regulator between the
heater and propane/LP supply.
WARNING: Never connect
natural gas replace to private
(non-utility) gas wells. This
gas is commonly known as
wellhead gas.
Installation Items Needed
Before installing heater, make sure you have the
items listed below.
• external regulator (supplied by installer)
• piping (check local codes)
• sealant (resistant to propane/LP gas)
• equipment shutoff valve *
• test gauge connection *
• sediment trap
• tee joint
• pipe wrench
• approved exible gas line with gas connector
(if allowed by local codes) (not provided)
* A CSA design-certied equipment shutoff valve
with 1/8" NPT tap is an acceptable alternative to
test gauge connection. Purchase the optional CSA
design-certied equipment shutoff valve from your
dealer. See Accessories, page 42.
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" 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 14. Pointing the vent down
protects it from freezing rain or sleet.
CAUTION: Use only new,
black iron or steel pipe. In-
ternally-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
heater. If pipe is too small, undue
loss of volume will occur.
Propane/LP
Supply Tank External
Regulator
Figure 14 - External Regulator With Vent
Pointing Down
Vent
Pointing
Down
INSTALLATION
Continued

www.desatech.com
119426-01A 15
Pipe Cap Tee
Nipple Joint
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 heater (see Figures 15
or 16, depending on your model).
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 replaces.
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 heater valves.
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 Figures 15 or 16, depend-
ing on your model. Locate sediment trap where it is
within reach for cleaning. Install in piping system
between fuel supply and heater. Locate sediment
trap where trapped matter is not likely to freeze.
A sediment trap traps moisture and contaminants.
This keeps them from going into heater controls. If
sediment trap is not installed or is installed wrong,
heater may not run properly.
CAUTION: Avoid damage to
regulator. Hold gas regulator
with wrench when connecting
it to gas piping and/or ttings
(Thermostatically-Controlled
Models Only).
CAUTION: Avoid damage to
gas control. Hold gas control
with wrench when connecting
it to gas piping and/or ttings
(Remote-Ready Models Only).
Figure 15 - Gas Connection
(Thermostatically-Controlled Models Only)
* Purchase the optional CSA design-certied
equipment shutoff valve from your dealer. See
Accessories, page 42.
**Minimum inlet pressure for purpose of input
adjustment.
Figure 16 - Gas Connection (Remote-
Ready Models Only)
Gas
Control
Tee Cap Pipe
Joint Nipple
3" Minimum
Gas
Regulator
PROPANE/LP
From External
Regulator
(11" W.C.**
to 14" W.C.
Pressure)
CSA Design-Certied
Equipment Shutoff Valve
With 1/8" NPT Tap*
Approved Flexible
Gas Hose (if
allowed by local
codes)
Sediment Trap
NATURAL
From Gas
Meter
(5" W.C.**
to 10.5"
W.C.
Pressure)
3" Minimum
Sediment Trap
CSA Design-Certied
Equipment Shutoff Valve
With 1/8" NPT Tap*
Approved Flexible
Gas Hose (if
allowed by local
codes)
PROPANE/LP
From External
Regulator
(11" W.C.**
to 14" W.C.
Pressure)
NATURAL
From Gas
Meter
(5" W.C.**
to 10.5"
W.C.
Pressure)

www.desatech.com 119426-01A16
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 ame to check for a leak.
Apply a noncorrosive leak detec-
tion uid 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 heater. See guidelines un-
der Connecting to Gas Supply,
page 14.
PRESSURE TESTING GAS SUPPLY
PIPING SYSTEM
Test Pressures In Excess Of 1/2 PSIG
(3.5 kPa)
1. Disconnect appliance with its appliance main
gas valve (control valve) and equipment
shutoff valve from gas supply piping system.
Pressures in excess of 1/2 psig will damage
heater 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 uid to all
joints. Bubbles forming show a leak.
5. Correct all leaks at once.
6. Reconnect heater and equipment shutoff valve
to gas supply. Check reconnected ttings for
leaks.
Test Pressures Equal To or Less Than 1/2
PSIG (3.5 kPa)
1. Close equipment shutoff valve (see Figure 17).
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
supply to equipment shutoff valve for pro-
pane/LP (see Figure 18 or 19, page 17). Apply
noncorrosive leak detection uid to all joints.
Bubbles forming show a leak.
4. Correct all leaks at once.
PRESSURE TESTING HEATER GAS
CONNECTIONS
1. Open equipment shutoff valve (see Figure 17).
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 heater is in the OFF
position.
4. Check all joints from equipment shutoff valve
to thermostat gas valve (Thermostat-Con-
trolled Models) or to gas control (Remote-
Ready Models) (see Figure 18 or 19, page
17). Apply noncorrosive leak detection uid
to all joints. Bubbles forming show a leak.
5. Correct all leaks at once.
6. Light heater (see Operating Heater, page 20
or 22, depending on your model). Check all
other internal joints for leaks.
7. Turn off heater (see To Turn Off Gas to Appli-
ance, page 21 for Thermostat-Controlled mod-
els or page 23 for Remote-Ready Models).
Figure 17 - Equipment Shutoff Valve
Open
Closed
Equipment
Shutoff
Valve
INSTALLATION
Continued

www.desatech.com
119426-01A 17
INSTALLATION
Continued
Figure 18 - Checking Gas Joints
(Propane/LP Only)
Thermostat Gas
Valve or Control
Valve Location
Propane/LP
Supply Tank
Equipment
Shutoff Valve
Gas Meter
Figure 19 - Checking Gas Joints (Natural
Gas Only)
Thermostat Gas
Valve or Control
Valve Location
Equipment
Shutoff Valve
INSTALLING OPTIONAL REMOTE
ACCESSORIES
Installing Remote Receiver
Remote control accessories are available sepa-
rately (see Accessories, page 42).
1. If unit is already installed in replace, continue
with these instructions. If unit has not been
installed in replace, go to step 6 and continue
installation of remote accessory.
WARNING: Turn off heater
and let cool before handling any
part of heater. Make sure gas is
turned of to unit.
2. Carefully remove logs and set aside.
3. Locate mounting screws on sides of heater
base assembly and remove screws. Set screws
aside for reinstallation.
4. Disconnect gas line from heater base as shown
in Figure 11 or 12, page 13.
WARNING: A qualied ser-
vice person must connect and
disconnect gas to heater. Follow
all local codes.
5. Remove heater base from replace.
6. Install receiver bracket to base with phillips
screws provided in hardware kit as shown in
Figure 20.
7. Disconnect jumper wire from control valve at
TPTH and TH locations (see Figure 21).
8. Install remote receiver into receiver bracket
using pads and push button clips provided
with receiver (see Figure 22).
Figure 22 - Installing Remote Receiver
Push
Button
Clips Bracket
Battery
Clip
9-Volt Battery
Terminal
Wires
Pad
Figure 21 - Disconnecting Jumper Wire
From Control Valve
Jumper
Wire
Control Valve
Figure 20 - Installing Remote Receiver
Bracket
Remote Receiver Bracket
Phillips
Screws

www.desatech.com 119426-01A18
INSTALLING LOGS
WARNING: Failure to posi-
tion the parts in accordance
with these diagrams or failure
to use only parts specically
approved with this heater may
result in property damage or
personal injury.
Each log is marked with a number. These numbers
will help you identify the log when installing. It
is very important to install these logs exactly as
instructed. Do not modify logs. Only use logs
supplied with heater.
VUL Model Logs Only
1. Place bottom log in center of the base assem-
bly as shown in Figure 25, page 19.
2. Rest rear log in back corner sections of base
assembly as shown in Figure 25, page 19.
Make sure log is completely vertical and not
leaning in toward burner where the ame will
touch the log.
3. Position front right log against right side of
grate prongs (see Figure 25, page 19).
4. Position front left log against left side of grate
prongs (see Figure 25, page 19).
5. Place middle right log over front right and
bottom logs as shown in Figure 26, page 19.
Be sure hole in middle right log seats over pin
in bottom log.
Figure 24 - Installing Battery in Hand-Held
Remote Control Unit
INSTALLATION
Continued
9. Connect wires to control valve at the TPTH
and TH locations as shown in Figure 23.
Note: Make sure excess wire does not inter-
fere with burner or pilot.
10. If heater was removed from replace before
installation of remote accessory, see Install-
ing Heater Base Assembly on page 12 to rein-
stall heater into replace. Test gas connection
for leaks (see Checking Gas Connections,
page 16).
11. If logs were removed from heater for install
remote accessory, replace logs (see Installing
Logs, column 2).
Figure 23 - Connecting Wires
Control Valve
White Wire
From Receiver
Red Wire From
Receiver
Installing Batteries for Remote Receiver
and Hand Held Remote Control
Two 9-volt alkaline batteries (not included) are
required to operate this heater with the wireless
hand-held remote control set. One battery must be
installed in the receiver and one in the hand-held
remote control unit. Note: Only use alkaline
batteries.
Installing 9-Volt Battery in Receiver
1. Locate back of receiver behind receiver
bracket mounted on base assembly.
2. Locate the battery clip mounted on the back
of the receiver (see Figure 22, page 17).
3. Slide a 9-volt battery through the clip.
4. Attach the terminal wires to the battery.
Installing 9-Volt Battery (Not Included) in Hand-
Held Remote Control Unit
1. Remove battery cover on back of remote
control unit.
2. Attach terminal wires to the battery. Place
battery into the battery housing.
3. Replace battery cover onto remote control unit.
9-Volt Battery
Battery
Housing
Battery
Cover
Terminal
Wires
Remote Control Unit

www.desatech.com
119426-01A 19
INSTALLATION
Continued
Rear Log
Grate
Prongs
Figure 25 - Installing VUL Model Log Sets
Note: Your appliance may vary from model shown
but log placement will be the same.
Bottom
Log
Base Assembly Front Right
Log
Front Left Log
6. Place middle left log over front left and
bottom logs as show in Figure 26. Be sure
hole in middle left log seats over pin in
front left log.
CRB and HRB Model Logs Only
1. Place bottom log in center of the base assem-
bly as shown in Figure 27.
2. Rest rear log in back corner sections of base as-
sembly as shown in Figure 27. Make sure log is
completely vertical and not leaning in toward
burner where the ame will touch the log.
3. Position front log as shown in Figure 27,
making sure the grooves in the bottom of the
log t over the grate prongs.
Base
Assembly
Figure 27 - Installing CRB and HRB Model
Log Sets
Bottom
Log
Note: Your appliance may vary from model shown
but log placement will be the same.
Front Log
Figure 26 - Installing VUL Model Log Sets
Middle
Right
Log
Middle Left Log
Bottom
Log
Pin on Front
Left Log

www.desatech.com 119426-01A20
OPERATING HEATER
THERMOSTAT-CONTROLLED
MODELS
FOR YOUR SAFETY
READ BEFORE LIGHTING
WARNING: If you do not fol-
low these instructions exactly,
a re 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 oor because some gas is heavier than
air and will settle on the oor.
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 neighbor’s phone. Follow the gas
supplier’s instructions.
• If you cannot reach your gas supplier, call
the re 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, don’t
try to repair it, call a qualied service tech-
nician or gas supplier. Force or attempted
repair may result in a re or explosion.
D. Do not use this appliance if any part has
been under water. Immediately call a
qualied 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:
• If replace has glass doors,
never operate this heater with
glass doors closed. If you op-
erate heater with doors closed,
heat buildup inside replace
will cause glass to burst. Make
sure there are no obstructions
across openings of replace.
• You must operate this heater
with a replace screen in place.
Make sure replace screen is
closed before running heater.
NOTICE: During initial operation
of new heater, burning logs will
give off a paper-burning smell.
Orange ame will also be pres-
ent. Open damper or window to
vent smell. This will only last a
few hours.
Note: Home owners generally prefer to op-
erate their heater with the chimney damper
closed. This will put all the heat into the room.
However, there may be times you will desire
the full ames of the HI heat setting but will
nd the heat output excessive. You can open
the chimney damper (if you have one) fully or
partially to release some of the heat.
WARNING: Damper handle
will be hot if heater has been
running.
1. STOP! Read the safety information col-
umn 1.
2. Make sure equipment shutoff valve is fully
open.
3. Turn control knob clockwise to the
OFF position.
4. Wait ve (5) minutes to clear out any gas.
Then smell for gas, including near the oor.
If you smell gas, STOP! Follow “B” in the
safety information, column 1. If you don’t
smell gas, go to the next step.