Desa Hrb3624 Users Manual

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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-Certified As
Vented Decorative Appliances

WARNING: If the information in this manual is not followed exactly, a fire or explosion may result causing
property damage, personal injury or loss of life.
— Do not store or use gasoline or other flammable
vapors and liquids in the vicinity of this or any other
appliance.
— WHAT TO DO IF YOU SMELL GAS
• Do not try to light any appliance.
• Do not touch any electrical switch; do not use any
phone in your building.
• Immediately call your gas supplier from a neighbor’s
phone. Follow the gas supplier’s instructions.
• If you cannot reach your gas supplier, call the fire
department.
— Installation and service must be performed by a qualified installer, service agency or the gas supplier.
INSTALLER: Leave this manual with the appliance.
CONSUMER: Retain this manual for future reference.
For more information, visit www.desatech.com

Table of Contents
Safety Information................................................ 2
Product Identification............................................ 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
Specifications..................................................... 33
Illustrated Parts Breakdown and Parts List........ 34
Service Hints...................................................... 42
Technical Service............................................... 42
Replacement Parts............................................. 42
Accessories........................................................ 42
Warranty Information............................Back Cover

Safety Information

WARNING: Improper installation, adjustment, alteration, service or maintenance can cause injury
or property damage. Refer
to this manual for correct
installation and operational procedures. For assistance or additional information consult a qualified
installer, service agency
or the gas supplier.
WARNING: This appliance
is for installation only in a
solid-fuel burning masonry or UL127 factory-built
fireplace or in a listed ventless firebox enclosure. It is
design-certified for these
installations in accordance
with ANSI Z21.11.2. Exception: Do not install this
appliance in a factory-built
fireplace that includes
instructions stating it has
not been tested or should
not be used with unvented
gas logs.

WARNING: This is an
unvented gas-fired heater. It uses air (oxygen)
from the room in which
it is installed. Provisions
for adequate combustion
and ventilation air must
be provided. Refer to Air
for Combustion and Ventilation section on page 6
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

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119426-01A

SAFETY INFORMATION
Continued

WARNING: This product contains 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, operate or service this fireplace.
Improper use of this fireplace
can cause serious injury or
death from burns, fire, explosion, electrical shock and carbon
monoxide poisoning.
DANGER: Carbon monoxide
poisoning may lead to death!
Carbon Monoxide Poisoning: Early signs of carbon

monoxide poisoning resemble the flu, with headaches, dizziness or nausea. If you have these signs,
the fireplace may not be working properly. Get
fresh air at once! Have fireplace serviced. Some
people are more affected by carbon monoxide than
others. These include pregnant women, people with
heart or lung disease or anemia, those under the
influence of alcohol and those at high altitudes.
Natural 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 fireplace.

WARNING: Do not allow fans
to blow directly into the fireplace.
Avoid any drafts that alter burner
flame patterns. Ceiling fans can
create drafts that alter burner
flame patterns. Altered burner
patterns can cause sooting.
Due to high temperatures, the
appliance should be located out
of traffic and away from furniture
and draperies.
Do not place clothing or other
flammable material on or near
the appliance. Never place any
objects on the heater.
Heater 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 children when they are in the room
with heater. When using the handheld remote accessory (RemoteReady Models Only), keep selector switch in the OFF position to
prevent children from turning on
burners with remote.

WARNING: Any change to
this heater or its controls can
be dangerous.

You must operate this heater
with the fireplace screen and
hood in place. Make sure fireplace screen and hood are in
place before running heater.

WARNING: Do not use a
blower insert, heat exchanger
insert or other accessory not approved for use with this heater.

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

119426-01A

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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) inside 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 heater shall not be installed in a bedroom
or bathroom, unless installed as a vented appliance. See Installing Damper Clamp Accessory
for Vented Operation, page 12 (Remote-Ready
Models Only).
5. Before installing in a solid fuel burning
fireplace, the chimney flue and firebox must
be cleaned of soot, creosote, ashes and loose
paint by a qualified chimney cleaner. Creosote
will ignite if highly heated. A dirty chimney
flue may create and distribute soot within
the house. Inspect chimney flue for damage.
If damaged, repair flue and firebox before
operating heater.
6. Do not burn solid-fuel in a masonry or UL127
factory-built fireplace in which a vent-free
room heater is installed.
7. If fireplace has glass doors, never operate this
heater with glass doors closed. If you operate
heater with doors closed, heat buildup inside
fireplace will cause glass to burst. Make sure
there are no obstructions across openings of
fireplace.
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 flammable 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 qualified
service technician to inspect the room heater
and to replace any part of the control system
and any gas control which has been under
water.
14. Do not operate heater if any log is broken. Do
not operate heater if a log is chipped (dimesized 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 qualified 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 assembly 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

Product
Identification
Model CRB and
HRB Series Logs

State of Massachusetts: The installation must be made by a licensed plumber
or gas fitter in the Commonwealth of
Massachusetts.

Sellers of unvented propane or natural
gas-fired supplemental room heaters shall
provide to each purchaser a copy of 527
CMR 30 upon sale of the unit.
Vent-free gas products are prohibited for
bedroom and bathroom installation in the
Commonwealth of Massachusetts.

Optional Remote
Control Accessories

Ignitor
Control Knob

Model VUL
Series Logs

Base
Assembly
Rear Burner

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

Ignitor
Control
Remote Knob
Control
(Optional)

Flame
Base
Adjustment Assembly
Knob

Figure 1 - Product Identification

Local Codes

Install and use heater with care. Follow all local
codes. In the absence of local codes, use the latest edition of The National Fuel Gas Code, ANSI
Z223.1/NFPA 54*.
*Available from:
American National Standards Institute, Inc.
1430 Broadway
New York, NY 10018
National Fire Protection Association, Inc.
Batterymarch Park
Quincy, MA 02269

119426-01A

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 flames
and glowing coals. This heater is designed for ventfree operation with flue damper closed. It has been
tested and approved to ANSI Z21.11.2 standard for
unvented heaters. State and local codes in some
areas prohibit the use of vent-free heaters. This
heater may also be operated as a vented decorative
(ANSI Z21.60) product by opening the flue damper
(Non-Thermostat Models Only).

Safety Device

This heater has a pilot with an Oxygen Depletion 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.

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Air For Combustion
and Ventilation
WARNING: This heater shall
not be installed in a confined
space or unusually tight construction unless provisions are provided for adequate combustion and
ventilation air. Read the following
instructions to insure proper fresh
air for this and other fuel-burning
appliances in your home.
Today’s homes are built more energy efficient
than ever. New materials, increased insulation and
new construction methods help reduce heat loss
in homes. Home owners weather strip and caulk
around windows and doors to keep the cold air out
and the warm air in. During heating months, home
owners want their homes as airtight as possible.
While it is good to make your home energy efficient, your home needs to breathe. Fresh air must
enter your home. All fuel-burning appliances need
fresh air for proper combustion and ventilation.
Exhaust fans, fireplaces, clothes dryers and fuel
burning appliances draw air from the house to
operate. You must provide adequate fresh air for
these appliances. This will insure proper venting
of vented fuel-burning appliances.

PROVIDING ADEQUATE
VENTILATION

The following are excerpts from National Fuel
Gas Code, ANSI Z223.1/NFPA 54, Section 5.3,
Air for Combustion and Ventilation.
All spaces in homes fall into one of the three following ventilation classifications:
1. Unusually Tight Construction
2. Unconfined Space
3. Confined Space
The information on pages 6 through 8 will help
you classify your space and provide adequate
ventilation.
Unusually Tight Construction
The air that leaks around doors and windows
may provide enough fresh air for combustion and
ventilation. However, in buildings of unusually
tight construction, you must provide additional
fresh air.

Unusually tight construction is defined as
construction where:
a. walls and ceilings exposed to the outside atmosphere have a continuous
water vapor retarder with a rating of
one perm (6 x 10-11 kg per pa-sec-m2) or
less with openings gasketed or sealed
and
b. weather stripping has been added on
openable windows and doors and
c. caulking or sealants are applied to
areas such as joints around window
and door frames, between sole plates
and floors, between wall-ceiling joints,
between wall panels, at penetrations
for plumbing, electrical and gas lines
and at other openings.
If your home meets all of the three criteria
above, you must provide additional fresh
air. See Ventilation Air From Outdoors,
page 8.
If your home does not meet all of the
three criteria above, proceed to Determining Fresh-Air Flow For Heater Location,
below.
Confined and Unconfined Space
The National Fuel Gas Code, ANSI Z223.1/NFPA
54 defines a confined space as a space whose
volume is less than 50 cubic feet per 1,000 Btu
per hour (4.8 m3 per kw) of the aggregate input
rating of all appliances installed in that space and
an unconfined space as a space whose volume is
not less than 50 cubic feet per 1,000 Btu per hour
(4.8 m3 per kw) of the aggregate input rating of
all appliances installed in that space. Rooms communicating directly with the space in which the
appliances are installed*, through openings not
furnished with doors, are considered a part of the
unconfined space.
* Adjoining rooms are communicating only if
there are doorless passageways or ventilation grills
between them.

DETERMINING FRESH-AIR FLOW
FOR Heater LOCATION
Determining if You Have a Confined or
Unconfined Space
Use this work sheet to determine if you have a
confined or unconfined space.

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119426-01A

AIR FOR COMBUSTION
AND VENTILATION
Continued
Space: Includes the room in which you will install
fireplace plus any adjoining rooms with doorless passageways or ventilation grills between the rooms.
1. Determine the volume of the space (length x
width x height).

Length x Width x Height =__________cu. ft.
(volume of space)

Example: 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 = (Maximum Btu/Hr the space can support)

Example: 2560 cu. ft. (volume of space) x 20 =
51,200 (maximum Btu/Hr the space can support)
3. Add the Btu/Hr of all fuel burning appliances in
the space.

Vent-free 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. Direct-vent draws combustion air from the outdoors
and vents to the outdoors.

Example:
40,000 Btu/Hr

Gas water heater
____________
33,000 Btu/Hr

Vent-free fireplace
+_ __________
73,000 Btu/Hr

Total
=_ __________
4. Compare the maximum Btu/Hr the space can
support with the actual amount of Btu/Hr used.

___________ Btu/Hr (maximum the space can support)

___________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 confined space
because the actual Btu/Hr used is more than the maximum Btu/Hr the space can support. You must provide
additional fresh air. Your options are as follows:

A. Rework worksheet, adding the space of an adjoining room. If the extra space provides an unconfined
space, remove door to adjoining room or add
ventilation grills between rooms. See Ventilation
Air From Inside Building.
B. Vent room directly to the outdoors. See Ventilation Air From Outdoors, page 8.
C. Install a lower Btu/Hr fireplace, if lower Btu/Hr
size makes room unconfined.
If the actual Btu/Hr used is less than the maximum
Btu/Hr the space can support, the space is an unconfined space. You will need no additional fresh
air ventilation.

WARNING: If the area in
which the heater may be operated is smaller than that defined
as an unconfined space or if the
building is of unusually tight
construction, provide adequate
combustion and ventilation air
by one of the methods described
in the National Fuel Gas Code,
ANSI Z223.1/NFPA 54 Section 5.3
or applicable local codes.
VENTILATION AIR
Ventilation Air From Inside Building
This fresh air would come from an adjoining unconfined space. When ventilating to an adjoining
unconfined space, you must provide two permanent openings: one within 12" of the ceiling and
one within 12" of the floor on the wall connecting
the two spaces (see options 1 and 2, Figure 2). You
can also remove door into adjoining room (see
option 3, Figure 2). Follow the National Fuel Gas
Code, ANSI Z223.1/NFPA 54, Section 5.3, Air for
Combustion and Ventilation for required size of
ventilation grills or ducts.
12"

Ventilation
Grills Into
Adjoining
Room,
Option 1

Ventilation Grills
Into Adjoining Room,
Option 2

Or
Remove
Door into
Adjoining
Room,
Option
3

12"

Figure 2 - Ventilation Air from Inside Building
119426-01A

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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 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 thermostatcontrolled power vent. Heated air entering the attic
will activate the power vent.
Outlet
Air

Ventilated
Attic

Outlet
Air

To Attic

To
Crawl
Space
Inlet
Air
Inlet Air

Ventilated
Crawl Space

Figure 3 - Ventilation Air from Outdoors

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 primary heat source. If you have a
central heating system, you may
run system’s circulating blower
while using heater. This will help
circulate the heat throughout the
house. In the event of a power
outage, you can use this heater
as your primary heat source.
WARNING: A qualified service person must install heater.
Follow all local codes.

NOTICE: State or local codes
may only allow operation of this
appliance in a vented configuration. Check your state or local
codes.
WARNING: Make sure the
selector switch is in the OFF
position before installing heater
(Remote-Ready Models Only).
WARNING: Before installing
in a solid fuel burning fireplace,
the chimney flue and firebox
must be cleaned of soot, creosote, ashes and loose paint by
a qualified chimney cleaner.
Creosote will ignite if highly
heated. A dirty chimney flue may
create and distribute soot within
the house. Inspect chimney and
firebox flue for damage. If damaged, repair flue and firebox
before operating heater.
WARNING: Seal any fresh
air vents or ash clean-out doors
located on floor or wall of fireplace. If not, drafting may cause
pilot outage or sooting. Use a
heat-resistant sealant. Do not
seal chimney flue damper.
WARNING: Never install the
heater
• in a bedroom or bathroom
unless installed as a vented
appliance, see page 12 (Remote-Ready Models Only)
• in a recreational vehicle
• where curtains, furniture, clothing or other flammable objects
are less than 42" from the front,
top or sides of the heater
• in high traffic areas
• in windy or drafty areas

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119426-01A

Installation
Continued

CAUTION: This heater creates warm air currents. These
currents move heat to wall surfaces next to heater. Installing
heater next to vinyl or cloth wall
coverings or operating heater
where impurities (such as, but
not limited to, tobacco smoke,
aromatic candles, cleaning fluids, oil or kerosene lamps, etc.) in
the air exist, may discolor walls
or cause odors.
Important: Vent-free heaters add moisture to
the air. Although this is beneficial, installing heater
in rooms 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 propane/LP gas. Field conversion
is not permitted.

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

Carefully follow the instructions below. This will
ensure safe installation into a masonry, UL127listed manufactured fireplace or listed vent-free
firebox.
Minimum Clearances For Side
Combustible Material, Side Wall and
Ceiling
A. Clearances from the side of the fireplace
cabinet to any combustible material and wall
should follow diagram in Figure 4.
Example: The face of a mantel, bookshelf,
etc. is made of combustible material and
protrudes 3 1/2" from the wall. This combustible material must be 4" from the side of the
fireplace 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".

Example

INSTALLATION AND CLEARANCES
For Vent-Free Operation

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

*
*Minimum 16" from Side Wall

Figure 4 - Minimum Clearance for
Combustible to Wall

MINIMUM FIREPLACE CLEARANCE TO
COMBUSTIBLE MATERIALS

Log Size
18", 24", 30"

Side Wall
16"

Ceiling
42"

Floor
5"

119426-01A

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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 flue damper open.
If running heater with damper
open, noncombustible material
above fireplace 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 fireplace opening. Noncombustible materials
(such as slate, marble, tile, etc.) must be at least
1/2" thick. With sheet metal, you must have noncombustible 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 fireplace hood accessory (24" and
30" Models Only). See Figure 5 for minimum
clearances.
If Using Mantel
You must have noncombustible material(s) above
the fireplace opening. Noncombustible materials
(such as slate, marble, tile, etc.) must be at least
1/2" thick. With sheet metal, you must have noncombustible 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 fireplace hood accessory (24"
and 30" Models Only). Even if noncombustible
material is more than 12", you may need the hood
accessory to deflect heat away from your mantel
shelf. See Figure 5 and Figures 6 and 7, page 9,
for minimum clearances.
IMPORTANT: If you cannot meet these minimum
clearances, you must operate heater with chimney
flue damper open. Go to Installing Damper Clamp
Accessory for Vented Operation, page 12.

Noncombustible
Material
Requirements for
Distance (A)
Safe Installation
12" or more
Noncombustible material OK.
Between 8" and 12" 24" or 30" Models:
Install fireplace hood
accessory (GA6050,
GA6052 or GA6053 see
Accessories, page 42).

18" Model: Noncombustible material OK.
Less than 8"
Noncombustible material must be extended to
at least 8". See Between
8" and 12", above. If you
cannot extend material,
you must operate heater
with flue damper open.

Heat Resistant
Material
(A)

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

Mantel Clearances

In addition to meeting noncombustible material
clearances, you must also meet required clearances
between fireplace opening and mantel shelf. If
you do not meet the clearances listed below, you
will need a hood.
Determining Minimum Mantel Clearance
If you meet minimum clearance between mantel
shelf and top of fireplace opening, a hood is not
required (see Figure 6, 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

Installation

Mantel Shelf

12"

Continued

Underside of
Mantel Shelf

10"
8"

NOTICE: Surface temperatures
of adjacent walls and mantels become hot during operation. Walls
and mantels above the firebox
may become hot to the touch.
If installed properly, these temperatures meet the requirement
of the national product standard.
Follow all minimum clearances
shown in this manual.
Notice: If your installation does
not meet the minimum clearances shown, you must do one
of the following:
• operate the logs only with the
flue damper open
• raise the mantel to an acceptable height
• remove the mantel

6"
2 1/2"

All minimum
distances are
in inches

Minimum
Noncombustible
Material
8"
Min.

Hood
(GA6050,
GA6052,
or GA6053)

12"

15"

Distances to
Underside of
Mantel

18"

20"

Log Sets
18", 24",
& 30"
Models
Top of
Fireplace
Opening

Figure 7 - Minimum Mantel Clearances
When Using Hood

Floor Clearances

A. If installing appliance on the floor level, you
must maintain the minimum distance of 14"
to combustibles (see Figure 8).
B. If combustible materials are less than 14" to
the fireplace, you must install appliance at
least 5" above the combustible flooring (see
Figure 9).

Mantel Shelf
10"

Underside of
Mantel Shelf

8"
6"
2 1/2"

All minimum
distances are
in inches
Minimum NonCombustible
Material

(A)
12"

18" 20" 22"

24"

14" 17" 19"

20"

Minimum NonCombustible
Material Height

Distances to
Underside of
Mantel

Log Set
24"/30"/36"
Models
18" Model
Top of
Fireplace
Opening

Combustible
Material

14"
Min.

Noncombustible Material

Figure 8 - Minimum Fireplace Clearances
If Installed at Floor Level

Hearth

Figure 6 - Minimum Mantel Clearances
Without Using Hood

Combustible
Material

5"
Min.

Figure 9 - Minimum Fireplace Clearances
Above Combustible Flooring

119426-01A

www.desatech.com

Damper
Clamp

Installation
Continued

Damper

INSTALLING DAMPER CLAMP
ACCESSORY FOR VENTED
OPERATION

Note: When used as a vented heater, appliance
must be installed only in a solid-fuel burning
fireplace with a working flue 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 fireplace does not meet the clearance
to combustibles requirements for vent-free
operation.
2. State or local codes do not permit vent-free
operation.
3. You prefer vented operation.
If reasons number 1 or 2 above apply to you, you
must permanently open chimney flue damper. You
must install the damper clamp accessory (to order,
see Accessories, page 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 flue
opening you must provide. Attach damper clamp
so the minimum permanent flue opening will be
maintained at all times.

Area of Various Standard Round Flues
Diameter
Are
5"
20 sq. inches
6"
29 sq. inches
7"
39 sq. inches
8"
51 sq. inches

Chimney
Height
6' to 15'
15' to 30'

Minimum Permanent
Flue Opening
39 sq. inches
29 sq. inches

Damper
Clamp
Damper

Masonry Fireplace

Damper

Manufactured Fireplace

Figure 10 - Attaching Damper Clamp

INSTALLING HEATER BASE
ASSEMBLY

WARNING: You must secure
this heater to fireplace floor. If
not, heater will move when you
adjust controls. Moving heater
may cause a gas leak.
WARNING: If installing in a
sunken fireplace, special care
is needed. You must raise the
fireplace floor to allow access to
heater control panel. This will insure adequate air flow and guard
against sooting and controls being damaged. Raise fireplace floor
with noncombustible material.
Make sure material is secure.
CAUTION: Do not pick up
heater base assembly by burners. This could damage heater.
Only handle base assembly by
grates.

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119426-01A

Installation

Heater Gas
Regulator

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 floor. See Optional Positioning Of Thermostat
Sensing Bulb, page 32.
Installation Items Needed
• hardware package (provided with heater)
• approved flexible gas hose and fittings (not
provided) (if allowed by local codes)
• sealant (resistant to propane/LP gas, not provided)
• 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 (RemoteReady Models Only). See installation instructions
included with the kit.
1. Apply pipe joint sealant lightly to male threads
of gas fitting (not provided). For Thermostatically-Controlled Models connect approved
flexible gas hose to gas regulator of heater
(see Figure 11). For Remote-Ready models
connect approved flexible gas hose to inlet
side of gas control (see Figure 12). IMPORTANT: Hold gas regulator with wrench when
connecting flexible gas hose (Thermostatically-Controlled Models Only).
2. Position heater base assembly in fireplace.
3. Mark screw locations through holes in front
panel of base (see Figure 13). If installing in a
brick-bottom fireplace, mark screw locations
in mortar joint of bricks.
4. Remove heater base from fireplace.
5. Drill holes at marked locations using 3/16"
drill bit.
6. Attach base, through holes in front panel of base,
to fireplace floor using masonry screws provided
in hardware package (see Figure 13).
7. Connect to gas supply. See Connecting To Gas
Supply, page 14.

119426-01A

Flexible Gas Hose (if
allowed by local codes)
Figure 11 - Attaching Flexible Gas Hose to
Heater Gas Regulator (ThermostaticallyControlled Models Only)
Gas Control

Flexible Gas Hose
(if allowed by local
codes)

Figure 12 - Attaching Flexible Gas Hose
to Heater Gas Regulator
(Remote-Ready Models Only)
Masonry Screw

Figure 13 - Attaching Base to Fireplace
Floor (Remote-Ready Models Only)

www.desatech.com

Installation
Continued
CONNECTING TO GAS SUPPLY

WARNING: This appliance
requires a 1/2" NPT (National
Pipe Thread) inlet connection to
the pressure regulator.
WARNING: A qualified service person must connect heater
to gas supply. Follow all local
codes.
CAUTION: Never connect
propane/LP fireplace directly
to the propane/LP supply. This
heater requires an external regulator (not supplied). Install the
external regulator between the
heater and propane/LP supply.

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 pressure, 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. Internally-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

WARNING: Never connect
natural gas fireplace to private
(non-utility) gas wells. This
gas is commonly known as
wellhead gas.
Installation Items Needed
Before installing 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 flexible gas line with gas connector
(if allowed by local codes) (not provided)
* A CSA design-certified equipment shutoff valve
with 1/8" NPT tap is an acceptable alternative to
test gauge connection. Purchase the optional CSA
design-certified equipment shutoff valve from your
dealer. See Accessories, page 42.

External
Regulator

Vent
Pointing
Down

Figure 14 - External Regulator With Vent
Pointing Down

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119426-01A

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 requirements for locating equipment shutoff valve
to fireplaces.
Apply pipe joint sealant lightly to male NPT
threads. This will prevent excess sealant from
going into pipe. Excess sealant in pipe could result
in clogged 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, depending 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 fittings
(Thermostatically-Controlled
Models Only).
CAUTION: Avoid damage to
gas control. Hold gas control
with wrench when connecting
it to gas piping and/or fittings
(Remote-Ready Models Only).

119426-01A

Propane/LP
From External
Regulator
(11" W.C.**
to 14" W.C.
Pressure)

CSA Design-Certified
Equipment Shutoff Valve
With 1/8" NPT Tap*
Approved Flexible
Gas Hose (if
allowed by local
codes)

Natural
From Gas
3" Minimum
Meter
(5" W.C.**
to 10.5" Tee Cap Pipe
Joint Nipple
W.C.
Pressure)
Sediment Trap

Gas
Regulator

Figure 15 - Gas Connection
(Thermostatically-Controlled Models Only)
CSA Design-Certified
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
Pipe Cap Tee (5" W.C.**
to 10.5"
Nipple Joint
W.C.
Sediment Trap
Pressure)

3" Minimum

Gas
Control

Figure 16 - Gas Connection (RemoteReady Models Only)
* Purchase the optional CSA design-certified
equipment shutoff valve from your dealer. See
Accessories, page 42.
**Minimum inlet pressure for purpose of input
adjustment.

www.desatech.com

Installation
Continued
CHECKING GAS CONNECTIONS

WARNING: Test all gas piping
and connections, internal and
external to unit, for leaks after
installing or servicing. Correct
all leaks at once.
WARNING: Never use an
open flame to check for a leak.
Apply a noncorrosive leak detection fluid to all joints. Bubbles
forming show a leak. Correct all
leaks at once.
CAUTION: Make sure external regulator has been installed
between propane/LP supply
and heater. See guidelines under 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 fluid 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 fittings 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 propane/LP (see Figure 18 or 19, page 17). Apply
noncorrosive leak detection fluid 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-Controlled Models) or to gas control (RemoteReady Models) (see Figure 18 or 19, page
17). Apply noncorrosive leak detection fluid
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 Appliance, page 21 for Thermostat-Controlled models or page 23 for Remote-Ready Models).
Equipment
Shutoff
Valve

Open

Closed
Figure 17 - Equipment Shutoff Valve

www.desatech.com

119426-01A

4. Disconnect gas line from heater base as shown
in Figure 11 or 12, page 13.

Installation
Continued
Propane/LP
Supply Tank

Equipment
Shutoff Valve

Thermostat Gas
Valve or Control
Valve Location
Figure 18 - Checking Gas Joints
(Propane/LP Only)

WARNING: A qualified service person must connect and
disconnect gas to heater. Follow
all local codes.
5. Remove heater base from fireplace.
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).

Equipment
Shutoff Valve
Phillips
Screws

Gas Meter

Remote Receiver Bracket
Figure 20 - Installing Remote Receiver
Bracket
Thermostat Gas
Valve or Control
Valve Location

Figure 19 - Checking Gas Joints (Natural
Gas Only)

Installing optional remote
accessories
Installing Remote Receiver
Remote control accessories are available separately (see Accessories, page 42).
1. If unit is already installed in fireplace, continue
with these instructions. If unit has not been
installed in fireplace, go to step 6 and continue
installation of remote accessory.

Jumper
Wire

Control Valve

Figure 21 - Disconnecting Jumper Wire
From Control Valve
9-Volt Battery

Battery
Clip

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.
119426-01A

Push
Button
Clips

Pad
Bracket

Terminal
Wires

Figure 22 - Installing Remote Receiver

www.desatech.com

Installation

Battery
Cover

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 interfere with burner or pilot.
10. If heater was removed from fireplace before
installation of remote accessory, see Installing Heater Base Assembly on page 12 to reinstall heater into fireplace. 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).
White Wire
From Receiver

Control Valve

Red Wire From
Receiver

Figure 23 - Connecting Wires
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 HandHeld 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.

Remote Control Unit

Terminal
Wires
Battery
Housing
9-Volt Battery
Figure 24 - Installing Battery in Hand-Held
Remote Control Unit

INSTALLING LOGS

WARNING: Failure to position the parts in accordance
with these diagrams or failure
to use only parts specifically
approved with this heater may
result in property damage or
personal injury.
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 assembly 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 flame 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.

www.desatech.com

119426-01A

Installation
Continued
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.
Front Left Log
Rear Log

CRB and HRB Model Logs Only
1. Place bottom log in center of the base assembly as shown in Figure 27.
2. Rest rear log in back corner sections of base assembly as shown in Figure 27. Make sure log is
completely vertical and not leaning in toward
burner where the flame will touch the log.
3. Position front log as shown in Figure 27,
making sure the grooves in the bottom of the
log fit over the grate prongs.
Front Log

Bottom
Log
Grate
Prongs

Bottom
Log
Base Assembly

Front Right
Log

Figure 25 - Installing VUL Model Log Sets
Note: Your appliance may vary from model shown
but log placement will be the same.
Middle Left Log

Pin on Front
Left Log

Middle
Right
Log

Base
Assembly
Figure 27 - Installing CRB and HRB Model
Log Sets
Note: Your appliance may vary from model shown
but log placement will be the same.

Bottom
Log

Figure 26 - Installing VUL Model Log Sets

119426-01A

www.desatech.com

Operating Heater
Thermostat-Controlled
Models
FOR YOUR SAFETY
READ BEFORE LIGHTING

WARNING: If you do not follow these instructions exactly,
a fire or explosion may result
causing property damage, personal injury or loss of life.
A. This appliance has a pilot which must be
lighted by hand. When lighting the pilot,
follow these instructions exactly.
B. BEFORE LIGHTING smell all around the
appliance area for gas. Be sure to smell next
to the floor because some gas is heavier than
air and will settle on the floor.
WHAT TO DO IF YOU SMELL GAS
• Do not try to light any appliance.
• Do not touch any electric switch; do not
use any phone in your building.
• Immediately call your gas supplier from
a neighbor’s phone. Follow the gas
supplier’s instructions.
• If you cannot reach your gas supplier, call
the fire department.
C. Use only your hand to push in or turn the
gas control knob. Never use tools. If the
knob will not push in or turn by hand, don’t
try to repair it, call a qualified service technician or gas supplier. Force or attempted
repair may result in a fire or explosion.
D. Do not use this appliance if any part has
been under water. Immediately call a
qualified service technician to inspect the
appliance and to replace any part of the
control system and any gas control which
has been under water.

LIGHTING
INSTRUCTIONS

WARNING:
• If fireplace has glass doors,
never operate this heater with
glass doors closed. If you operate heater with doors closed,
heat buildup inside fireplace
will cause glass to burst. Make
sure there are no obstructions
across openings of fireplace.
• You must operate this heater
with a fireplace screen in place.
Make sure fireplace screen is
closed before running heater.
NOTICE: During initial operation
of new heater, burning logs will
give off a paper-burning smell.
Orange flame will also be present. Open damper or window to
vent smell. This will only last a
few hours.
Note: Home owners generally prefer to operate 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 flames of the HI heat setting but will
find 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 column 1.
2. Make sure equipment shutoff valve is fully
open.
3. Turn control knob clockwise
to the
OFF position.
4. Wait five (5) minutes to clear out any gas.
Then smell for gas, including near the floor.
If you smell gas, STOP! Follow “B” in the
safety information, column 1. If you don’t
smell gas, go to the next step.

www.desatech.com

119426-01A

Operating Heater
Continued
5. Turn control knob counterclockwise
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 supply. If so, the control knob may need to be
pressed in for 30 seconds or more. This will
allow air to bleed from the gas system.
6. With control knob pressed in, press and
release ignitor button. This will light pilot.
The pilot is attached to the front burner. If
needed, keep pressing ignitor button until
pilot lights.
Note: If pilot does not stay lit, contact a
qualified service person or gas supplier for
repairs. Until repairs are made, light pilot
with match. To light pilot with match, see
Manual Lighting Procedure.
7. Keep control knob pressed in for 30 seconds
after lighting pilot. After 30 seconds, release
control knob.
• If control knob does not pop out when
released, contact a qualified service person
or gas supplier for repairs.
Note: If pilot goes out, repeat steps 3
through 7. This heater has a safety interlock
system. Wait one (1) minute for system to
reset before lighting pilot again.
8. Turn control knob counterclockwise
to desired heating level. The burners should
light. Set control knob to any heat level
between HI and LO.

CAUTION: Do not try to adjust heating levels by using the
equipment shutoff valve.

Ignitor Button

Thermocouple

Ignitor Electrode
Pilot
Burner

Figure 29 - Pilot

TO TURN OFF GAS
TO APPLIANCE
Shutting Off Heater
Turn control knob clockwise
OFF position.

to the

Shutting Off Burners Only (pilot stays lit)
Turn control knob clockwise
to the
PILOT position.

THERMOSTAT CONTROL
OPERATION

The thermostat control knob can be set to any
comfort level between HI and LO. The thermostat will gradually modulate the heat output
and flame height from higher to lower settings
or pilot, in order to maintain the comfort level
you select. The ideal comfort setting will vary
by household depending upon the amount of
space to be heated, the output of the central
heating system, etc.
Note: Selecting the HI setting with the control
knob will cause the burner to remain fully on,
without modulating down in most cases.

MANUAL LIGHTING
PROCEDURE

1. Follow steps 1 through 5 under Lighting
Instructions, page 20 .
2. Depress control knob and light pilot with
match.
3. Keep control knob pressed in for 30 seconds
after lighting pilot. After 30 seconds, release
control knob. Now follow step 8 under
Lighting Instructions, column 1.

Control Knob

Figure 28 - Control Knob and Ignitor
Button Location

119426-01A

www.desatech.com

Operating Heater

LIGHTING
INSTRUCTIONS

Continued
Remote-Ready Models
FOR YOUR SAFETY READ
BEFORE LIGHTING

WARNING: Damper handle
will be hot if heater has been
running.
1. STOP! Read the safety information column 1.
2. Make sure equipment shutoff valve is fully
open.
3. Set selector switch in the OFF position.
4. Press in and turn control knob clockwise
to the OFF position (see Figure 30,
page 23).

WARNING: Burners will come
on automatically within one minute
when the selector switch is in the
ON position after the pilot is lit.
22

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119426-01A

Operating Heater
Continued
5. Wait five (5) minutes to clear out any gas.
Then smell for gas, including near the floor.
If you smell gas, STOP! Follow “B” in the
safety information, column 1, page 22. If
you don’t smell gas, go to the next step.
6. Press in and turn control knob counterclockwise
to the PILOT position.
Press in control knob for five (5) seconds
(see Figure 30).
Note: You may be running this heater for
the first time after hooking up to gas supply. If so, the control knob may need to be
pressed in for 30 seconds or less. This will
allow air to bleed from the gas system.
7. With control knob pressed in, press and
release ignitor button. This will light pilot.
The pilot is attached to the front burner. If
needed, keep pressing ignitor button until
pilot lights.
Note: If pilot does not stay lit, contact a
qualified service person or gas supplier for
repairs. Until repairs are made, light pilot
with match. To light pilot with match, see
Manual Lighting Procedure, page 24.
8. Keep control knob pressed in for 30 seconds
after lighting pilot. After 30 seconds, release
control knob.
• If control knob does not pop out when
released, contact a qualified service person
or gas supplier for repairs.
Note: If pilot goes out, repeat steps 4
through 8, page 22 and above.
9. Slightly push in and turn control knob counterclockwise
to the ON position.
10. Wait one minute and switch selector switch to
the ON position to light burners. Note: AUTO
is only functional when using GWMT1 or
GWMS2 optional accessories.
11. Set flame adjustment knob to any level
between HI and LO.
Control Knob

LO
OF F

ON
OFF
REMOTE

P IL O

Flame
Adjustment Selector Switch
Knob
in OFF Position
Figure 30 - Control Knob and Ignitor
Button Location

Ignitor
Button

119426-01A

CAUTION: Do not try to adjust heating levels by using the
equipment shutoff valve.
WARNING: Make sure the selector switch is in the OFF position
when you are away from home for
long periods of time. Heater will
come on automatically with selector switch in the ON position.
Pilot
Burner

Ignitor
Electrode

Figure 31 - Pilot (Propane/LP)
Pilot Burner

Ignitor
Electrode

Figure 32 - Pilot (Natural)

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
prevent draining battery.
Shutting Off Burners Only (pilot stays lit)
You may shut off the burners and keep the pilot
lit by doing one of the following:
1. Turn control knob clockwise
to the
PILOT position.
2. Use remote control manual OFF button.
3. Set selector switch in the OFF position.

www.desatech.com

Operating Heater
Continued
MANUAL LIGHTING
PROCEDURE

1. Follow steps 1 through 6 under Lighting
Instructions, pages 22 and 23.
2. Depress control knob and light pilot with
match.
3. Keep control knob pressed in for 30 seconds
after lighting pilot. After 30 seconds, release
control knob. Now follow steps 9 through
11, Lighting Instructions, page 23.

To Lock press both buttons on hand-held
remote control until light stops flashing. Handheld 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. The hand-held remote is now
unlocked.
Indicator
Light
Control
Button

optional Hand-Held
REMOTE OPERATION

Note: All remote control accessories must be
purchased separately (see Accessories, page
42). Follow instructions included with the
remote control.

NOTICE: You must light the pilot
before using the hand-held remote control unit. See Lighting
Instructions on page 22.
After lighting, let pilot flame burn for about
one minute. Turn control knob to ON position. Adjust flame adjustment knob anywhere
between HI and LO. Slide the selector switch to
the REMOTE position (see Figure 33). Note:
The burner may light if hand-held remote was
on when selector switch was last turned off.
You can now turn the burner on and off with
the hand-held remote control unit.
IMPORTANT: Do not leave the selector switch
in the REMOTE or ON position when the pilot
is not lit. This will drain the battery.
Control Knob in
On Position
ON

Thermostat Series (Model
HRC200)

The hand-held remote can be operated using
either the manual mode (MANU) or thermostatic mode (AUTO) (see Figure 35). To select
Fahrenheit/Centigrade mode display, carefully
press the ˚C/˚F mode button with the end of a
paper clip or similar blunt object.

Locks
System to
Prevent
Accidental
Flame Adjustment Ignition
Knob
LO

Figure 34 - On/Off Hand-Held Remote
Control Unit

ON
OFF
REMOTE

Turns
Burners
On or
Off

PI L O

On/Off Series (Model HRC100)

Hold the control button on the hand-held remote
until burner turns on. Hold the control button
again until burner turns off (see Figure 34).
24

ROOM
TEMP

LOCK

MANU

AUTO
SET
TEMP

TEMP

ºC/ºF

POWER

AUTO

Turns
Hand-Held
Remote On
or Off and
Allows You
to Choose
the Manual
Setting
Selects
AUTO
Mode

Selector Toggle Switch (Optional
Hand-Held Remote Control)
Figure 33 - Setting the Selector switch,
Control Knob and Flame Adjustment
Knob for Remote Operation

Digital Display Shows
Temperature and Settings

Increases
or Decreases Room
°C/°F Mode
Temperature in
Button
AUTO Mode
Figure 35 - Thermostat Hand-Held
Remote Control Unit

www.desatech.com

119426-01A

Operating Heater
Continued
Manual Mode
1. Press the POWER and LOCK buttons together
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
together to turn off the fireplace.
Auto (Thermostatic) Mode
1. Press the POWER and LOCK buttons together
to turn on the hand-held remote control.
2. Press AUTO button to select this mode.
3. Set the desired room temperature by pressing the TEMP + or - buttons.
4. Press the POWER and LOCK buttons
together to turn off the fireplace
Note: Do not leave the hand-held remote in the
AUTO mode close to the fireplace. The radiant
heat from the fireplace will turn off the fireplace.
Ideally, place the hand-held remote in the center
of the room facing towards the fireplace.
Note: Do not hold the hand-held remote for
a long time. Body temperature will affect its
operation in the AUTO mode.
Safety Features
When away from home for an extended period
of time or as a child safety feature to prevent
accidental ignition 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 Centigrade), the hand-held remote control will
perform a safety override and shut the
fireplace off. This feature is not available
in the MANU mode.
2. The receiver continuously receives signals
from the hand-held remote to control the
room temperature. If the hand-held remote
is misplaced, obstructed or for any reason
cannot transmit to the receiver, the receiver
will shut off the fireplace after 8 minutes.

Inspecting Burners

Check pilot flame pattern and burner flame patterns often.

PILOT FLAME PATTERN

Figure 36 shows a correct pilot flame pattern.
Figure 37 shows an incorrect pilot flame pattern.
The incorrect pilot flame is not touching the
thermocouple. This will cause the thermocouple
to cool. When the thermocouple cools, the heater
will shut down.
If pilot flame pattern is incorrect, as shown in
Figure 37
• turn heater off (see To Turn Off Gas to Appliance, page 21 [Thermostatically-Controlled
Models] or page 23 [Remote-Ready Models])
• see Troubleshooting, page 28
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.
Thermocouple

Pilot Burner

Thermocouple
Figure 36 - Correct Pilot Flame Pattern
(Your pilot may vary from pilots shown)
Thermocouple

Pilot Burner

Thermocouple
Figure 37 - Incorrect Pilot Flame Pattern
(Your pilot may vary from pilots shown)

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
operation (i.e. children operating the hand-held
remote control, etc.). The keypad is locked in
either on or off. Press the POWER and LOCK
buttons together to turn the unit on or off.
119426-01A

www.desatech.com

Inspecting Burners
Continued
FRONT BURNER FLAME PATTERN

Figure 38 shows correct front burner flame pattern. Figure 39 shows incorrect front burner flame
pattern. The incorrect burner flame pattern shows
yellow tipping at top of blue flame.

WARNING: If yellow tipping
occurs, your heater could produce increased levels of carbon
monoxide. If front burner flame
pattern shows yellow tipping,
follow instructions at bottom of
this page. Yellow flame on rear
burner is normal.
NOTICE: Do not mistake orange
flames with yellow tipping. Dirt
or other fine particles are burned
by heater, causing brief patches
of orange flame.
If front burner flame pattern is incorrect, as shown
in Figure 39
• turn heater off (see To Turn Off Gas to Appliance, page 21 [Thermostat-Controlled Models]
or page 23 [Remote-Ready Models])
• see Troubleshooting, page 28

Figure 38 - Correct Front Burner Flame
Pattern
Yellow Tipping At
Top of Blue Flame

Figure 39 - Incorrect Front Burner Flame
Pattern

Cleaning and
Maintenance
WARNING: Turn off heater
and let cool before cleaning.
CAUTION: You must keep
control areas, burners and
circulating air passageways
of heater clean. Inspect these
areas of heater before each use.
Have heater inspected yearly
by a qualified service person.
Heater may need more frequent
cleaning due to excessive lint
from carpeting, pet hair, bedding
material, etc.
WARNING: Failure to keep
the primary air opening(s) of
the burner(s) clean may result in
sooting and property damage.
Burner Injector Holder and
Pilot Air Inlet Hole

The primary air inlet holes allow the proper amount
of air to mix with the gas. This provides a clean
burning flame. Keep these holes clear of dust, dirt,
lint and pet hair. Clean these air inlet holes prior to
each heating season. Blocked air holes will create
soot. We recommend that you clean the unit every
three months during operation and have heater
inspected yearly by a qualified service person.
We also recommend that you keep the burner
tube and pilot assembly clean and free of dust and
dirt. To clean these parts we recommend using
compressed air no greater than 30 PSI. Your local
computer store, hardware store or home center
may carry compressed air in a can. You can use a
vacuum cleaner in the blow position. If using compressed air in a can, please follow the directions on
the can. If you don’t follow directions on the can,
you could damage the pilot assembly.
1. Shut off the unit, including the pilot. Allow
the unit to cool for at least thirty minutes.
2. Inspect burner, pilot and primary air inlet holes
on injector holder for dust and dirt (see Figure
40, page 27).
3. Blow air through the ports/slots and holes in
the burner.

www.desatech.com

119426-01A

Cleaning and
Maintenance
Continued
4. Check the injector holder located at the end
of the burner tube again. Remove any large
particles of dust, dirt, lint or pet hair with a
soft cloth or vacuum cleaner nozzle.
5. Blow air into the primary air holes on the
injector holder.
6. In case any large clumps of dust have now been
pushed into the burner repeat steps 3 and 4.
Clean the pilot assembly also. A yellow tip on the
pilot flame indicates dust and dirt in the pilot assembly. There is a small pilot air inlet hole about
2" from where the pilot flame comes out of the
pilot assembly (see Figure 41). With the unit off,
lightly blow air through the air inlet hole. You may
blow through a drinking straw if compressed air
is not available.

LOGS

• If you remove logs for cleaning, refer to Installing Logs, page 18, to properly replace logs.
• Replace log(s) if broken or chipped (dime-sized
or larger).

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
small blue 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
will create soot.

Wiring Diagram
(Remote-Ready Models Only)

Injector Holder
Ports/Slots

Burner
Tube
Primary Air
Inlet Holes

Thermopile

Figure 40 - Injector Holder On Outlet
Burner Tube

Pilot Air
Inlet Hole
Pilot Assembly
Figure 41 - Pilot Inlet Air Hole (Your pilot
may vary from pilot shown)

119426-01A

www.desatech.com

Troubleshooting
WARNING: Turn off heater and let cool before servicing. Only a
qualified service person should service and repair heater.
CAUTION: Never use a wire, needle or similar object to clean
ODS/pilot. This can damage ODS/pilot unit.
Note: All troubleshooting items are listed in order of operation.

OBSERVED PROBLEM

POSSIBLE CAUSE

REMEDY

When ignitor button is pressed,
there is no spark at ODS/pilot

1. Ignitor electrode not connected to ignitor cable
2. Ignitor cable pinched or wet

1. Reconnect ignitor cable

3. Broken ignitor cable
4. Bad ignitor
5. Ignitor electrode positioned
wrong
6. Ignitor electrode broken
7. Battery not installed, battery
power low or battery not
installed correctly (electronic
ignition models only)
When ignitor button is pressed,
there is spark at ODS/pilot but
no ignition

1. Gas supply turned off or equipment shutoff valve closed
2. Control knob not in PILOT
position
3. Control knob not pressed in
while in PILOT position
4. Air in gas lines when installed
5. Depleted gas supply (propane/LP only)
6. ODS/pilot is clogged
7. Gas regulator setting is not
correct

www.desatech.com

2. Free ignitor cable if pinched
by any metal or tubing. Keep
ignitor cable dry
3. Replace ignitor cable
4. Replace ignitor
5. Replace pilot assembly
6. Replace pilot assembly
7. Install new alkaline battery
in electronic ignitor. Verify
battery is installed correctly
1. Turn on gas supply or open
equipment shutoff valve
2. Turn control knob to PILOT
position
3. Press in control knob while in
PILOT position
4. Continue holding down control knob. Repeat igniting operation until air is removed
5. Contact local propane/LP gas
company
6. Clean ODS/pilot (see Cleaning
and Maintenance, page 26) or
replace ODS/pilot assembly
7. Replace gas regulator

119426-01A

Troubleshooting
OBSERVED PROBLEM
ODS/pilot lights but flame
goes out when control knob is
released

Continued
POSSIBLE CAUSE
1. Control knob not fully pressed
in
2. Control knob not pressed in
long enough
3. Safety interlock system has
been triggered
4. Equipment shutoff valve not
fully open
5. Pilot flame not touching thermocouple, which allows thermocouple to cool, causing
pilot flame to go out. This
problem could be caused by
one or both of the following:
A) Low gas pressure
B) Dirty or partially clogged
ODS/pilot
6. Thermocouple connection
loose at control valve
7. Thermocouple damaged
8. Control valve damaged

One or both burners do not light
after ODS/pilot is lit

1. Inlet gas pressure is too low
2. Burner orifice(s) clogged
3. Mislocated crossover tube
4. Remote selector in OFF position
(Remote-Ready models only)
5. Wire disconnected from gas control
(Remote-Ready models only)

Delayed ignition of one or both
burners

1. Manifold pressure is too low
2. Burner orifice(s) clogged
3. Mislocated crossover tube

Burner backfiring during combustion

1. Burner orifice is clogged or
damaged
2. Damaged burner
3. Gas regulator defective

Yellow flame in front burner
during burner combustion

1. Not enough air

2. Gas regulator defective
119426-01A

www.desatech.com

REMEDY
1. Press in control knob fully
2. After ODS/pilot lights, keep control knob pressed in 30 seconds
3. Wait one minute for safety interlock system to reset. Repeat
ignition operation
4. Fully open equipment shutoff
valve
5. A) Contact local natural or
propane/LP gas company

B) Clean ODS/pilot (see
Cleaning and Maintenance,
page 26) or replace ODS/pilot
assembly
6. Hand tighten until snug, then
tighten 1/4 turn more
7. Replace pilot assembly
8. Replace control valve
1. Contact local natural or propane/LP gas company
2. Clean burner(s) (see Cleaning
and Maintenance, page 26) or
replace burner orifice(s)
3. Contact qualified service person
4. Put remote selector in ON
position
5. See Wiring Diagram, page 27
1. Contact local natural or propane/LP gas company
2. Clean burner(s) (see Cleaning
and Maintenance, page 26) or
replace burner orifice(s)
3. Contact qualified service person
1. Clean burner (see Cleaning
and Maintenance, page 26)
or replace burner orifice
2. Replace damaged burner
3. Replace gas regulator
1. Check burner(s) for dirt
and debris. If found, clean
burner(s) (see Cleaning and
Maintenance, page 26)
2. Replace gas regulator
29

Troubleshooting
OBSERVED PROBLEM

Continued
POSSIBLE CAUSE

REMEDY

Slight smoke or odor during
initial operation

1. Residues from manufacturing
processes and logs curing

1. Problem will stop after a few
hours of operation

Heater produces a whistling
noise when burners are lit

1. Turning control knob to HI
position when burners are
cold
2. Air in gas line

1. Turn control knob to LO
position and let warm up for
a minute
2. Operate burners until air is
removed from line. Have gas
line checked by local natural
or propane/LP gas company
3. Observe minimum installation clearances (see pages 9
through 11)
4. Clean burners (see Cleaning
and Maintenance, page 26)
or replace burner orifice(s)

3. Air passageways on heater
blocked
4. Dirty or partially clogged
burner orifice(s)
White powder residue forming
within burner box or on adjacent
walls or furniture

1. When heated, vapors from
furniture polish, wax, carpet
cleaners, etc. may turn into
white powder residue

1. Turn heater off when using
furniture polish, wax, carpet
cleaners or similar products

Moisture/condensation noticed
on windows

1. Not enough combustion/ventilation air

1. Refer to Air for Combustion
and Ventilation requirements
(page 6)

Remote does not function (Remote-Ready Models Only)

1. Battery is not installed. Battery power is low

1. Replace 9-volt batteries in receiver and hand-held remote

Heater produces a clicking/ticking noise just after burners are
lit or shut off

1. Metal expanding while heating
or contracting while cooling

1. This is normal with most heaters. If noise is excessive, contact
qualified service person

www.desatech.com

119426-01A

Troubleshooting
Continued

WARNING: 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.
IMPORTANT: Operating heater where impurities in air exist may create odors. Cleaning supplies, paint,
paint remover, cigarette smoke, cements and glues, new carpet or textiles, etc., create fumes. These
fumes may mix with combustion air and create odors. These odors will disappear over time.

OBSERVED PROBLEM

POSSIBLE CAUSE

REMEDY

Heater produces unwanted
odors

1. Heater burning vapors from paint,
hair spray, glues, cleaners, chemicals, new carpet, etc. (See IMPORTANT statement above)
2. Low fuel supply (propane/LP
only)
3. Gas leak. See Warning
statement at top of page

1. Open window to ventilate
room. Stop using odor causing products while heater is
running
2. Refill supply tank (propane/LP
only)
3. Locate and correct all leaks
(see Checking Gas Connections, page 16)

Heater shuts off in use (ODS
operates)

1. Not enough fresh air is available
2. Low line pressure

1. Open window and/or door for
ventilation
2. Contact local natural or propane/LP gas company
3. Clean ODS/pilot (see Cleaning
and Maintenance, page 26)

3. ODS/pilot is partially clogged
Gas odor even when control
knob is in OFF position

1. Gas leak. See Warning
statement at top of page
2. Control valve or gas control
defective

1. Locate and correct all leaks
(see Checking Gas Connections, page 16)
2. Replace control valve or gas
control

Gas odor during combustion

1. Foreign matter between control valve and burner
2. Gas leak. See Warning
statement at top of page

1. Take apart gas tubing and
remove foreign matter
2. Locate and correct all leaks
(see Checking Gas Connections, page 16)

Log set cycles to pilot, but room
temperature drops to a lower
than ideal level before log set
comes back on

1. Thermostat sensing bulb needs
to be repositioned (Thermostat-Controlled Models Only)

1. Reposition thermostat sensing
bulb (see Optional Positioning
of Thermostat Sensing Bulb,
page 32)
2. Move hand-held remote control unit farther away from the
heater

119426-01A

2. Hand-held remote control is
too close to heater (RemoteReady Models Only)
www.desatech.com

Optional Positioning
of Thermostat
Sensing Bulb
(Thermostat-Controlled Models Only)

For Masonry and Factorybuilt Metal Fireplace

If your log set cycles to pilot, but the room temperature drops to a lower than ideal comfort level
before the log set comes back on, you may want
to reposition the thermostat sensing bulb.
The thermostat sensing bulb is located on the gas
valve assembly. This location allows the thermostat to keep the room temperature at an ideal
comfort level for most fireplace applications. For
positioning the thermostat sensing bulb elsewhere,
an adhesive-backed mounting clip is available
(see Figure 42).
Tools needed: 5/16" hex driver or socket
1. Locate the gas valve assembly and thermostat
sensing bulb (see Figure 43).
2. With 5/16” hex driver or socket, loosen the
thermostat screw. Carefully slide the thermostat sensing bulb out of the retaining clamp
(see Figure 44).
Note: Do not remove the screw. Make sure
you tighten the screw after removing the
thermostat sensing bulb.
IMPORTANT: Do not force or bend the
thermostat sensing bulb or capillary.

3. The thermostat sensing bulb may be located
to the lower right front side of fireplace. Determine location of sensing bulb, but do not
mount sensing bulb until step 4. If you have a
masonry fireplace, see Figure 45 for location.
If you have a factory-built metal fireplace, see
Figure 46 for location.
If your fireplace has glass doors, position
sensing bulb directly behind door gap on right
bottom side (see Figure 47).
Capillary
(Unit Will
Differ From
Illustration)
Thermostat
Sensing Bulb
Screw

Retaining Clamp

Figure 44 - Removing Thermostat
Sensing Bulb
Thermostat
Sensing Bulb
Adhesive-backed
Mounting Clip
Figure 45 - Locating Thermostat Sensing
Bulb on Masonry Fireplace
Thermostat
Sensing Bulb

Figure 42 - Adhesive-backed Mounting
Clip
(Unit Will
Differ From
Illustration)
Gas Valve
Assembly
Thermostat
Sensing Bulb
Figure 43 - Location of Gas Valve
Assembly and Thermostat Sensing Bulb

Adhesive-backed
Mounting Clip
Figure 46 - Locating Thermostat Sensing
Bulb on Factory-built Metal Fireplace
Thermostat
Sensing Bulb
Adhesivebacked
Mounting Clip
Glass Doors

Figure 47 - Installing Thermostat Sensing
Bulb Behind Glass Doors
32

www.desatech.com

119426-01A

Optional Positioning of Thermostat Sensing Bulb
Continued
4. The mounting clip must be a minimum of 3"
from bottom of fireplace to prevent crimping
of capillary. Once you have decided on a
location, clean the area thoroughly. Remove
the paper backing from the adhesive on back
of mounting clip. Press the clip into the new
location so that the thermostat sensing bulb
will be positioned vertically with the capillary at the bottom (see Figure 48). Slide the
thermostat sensing bulb into the clip.
IMPORTANT: Do not crimp capillary.

Thermostat
Sensing Bulb

Capillary

Adhesivebacked
Mounting
Clip
Do Not
Crimp
Capillary

Figure 48 - Positioning the Thermostat
Sensing Bulb in the Vertical Position
with the Capillary at the Bottom

Specifications
THERMOSTAT MODELS

Remote-Ready MODELS

VUL18PT

VUL18PR/crb2618nr

VUL18NT

VUL18NR/crb2618nr

VUL24PT/VUL30Pt/HRB3624PT

VUL24PR/VUL30PR/crb3624pr/
crb3630pr/hrb3924pr/
hrb3930pr

•
•
•
•
•

Rating (Variable): 19,000/30,000 Btu/Hr
Type Gas: Propane/LP
Ignition: Electronic
Manifold Pressure: 7.9" W.C.
Inlet Gas Pressure (in. of water):
Max - 14" W.C., Min* - 11" W.C.
Rating (Variable): 19,000/28,000 Btu/Hr
Type Gas: Natural
Ignition: Electronic
Manifold Pressure: 3.4" W.C.
Inlet Gas Pressure (in. of water):
Max - 10.5" W.C., Min* - 5" W.C.
Rating (Variable): 25,000/36,000 Btu/Hr
Type Gas: Propane/LP
Ignition: Electronic
Manifold Pressure: 7.9" W.C.
Inlet Gas Pressure (in. of water):
Max - 14" W.C., Min* - 11" W.C.

VUL24NT/VUL30nt/HRB3624nt

• Rating (Variable): 25,000/36,000 Btu/Hr
• Type Gas: Natural
• Ignition: Electronic
• Manifold Pressure: 3.4" W.C.
• Inlet Gas Pressure (in. of water):
Max - 10.5" W.C., Min* - 5" W.C.
*For purpose of input adjustment

119426-01A

•
•
•
•
•

Rating (Variable): 25,000/36,000 Btu/Hr
Type Gas: Propane/LP
Ignition: Electronic
Manifold Pressure: 7.9" W.C.
Inlet Gas Pressure (in. of water):
Max - 14" W.C., Min* - 11" W.C.

VUL24NR/VUL30nR/crb3624nr/
crb3630nr/hrb3924nr/
hrb3930nr
• Rating (Variable): 25,000/36,000 Btu/Hr
• Type Gas: Natural
• Ignition: Electronic
• Manifold Pressure: 3.4" W.C.
• Inlet Gas Pressure (in. of water):
Max - 10.5" W.C., Min* - 5" W.C.
*For purpose of input adjustment

www.desatech.com

Illustrated Parts Breakdown and Parts List
Log Models
VUL18NT, VUL18PT, VUL24NT, VUL24PT, VUL30NT, VUL30PT, VUL18NR,
VUL18PR, VUL24NR, VUL24PR, VUL30NR and VUL30PR

This list contains replaceable parts used in your heater. When ordering parts, follow the instructions
listed under Replacement Parts on page 42 of this manual.

5
2
6

PART NUMBER
VUL18NT
VUL18PT
KEY VUL18NR
NO. VUL18PR

VUL24NT
VUL24PT
VUL24NR
VUL24PR

VUL30NT
VUL30PT
VUL30NR
VUL30PR

DESCRIPTION

1
2
3
4
5

113621-07
113621-08
113621-09
113621-10
113621-11
113621-19
113621-12

113621-13
113621-14
113621-15
113621-16
113621-11
113621-19
113621-18

Front Right Log (#1)
Front Left Log (#1)
Middle Right Log (#2)
Middle Left Log (#2)
Bottom Log (#3 - Remote)
Bottom Log (#3 - T-stat)
Rear Log (#3)

113621-01
113621-02
113621-03
113621-04
113621-05
113621-05
113621-06

www.desatech.com

QTY

1
1
1
1
1
1

119426-01A

Illustrated Parts Breakdown and Parts List
Log Models
CRB2618NR, CRB2618PR, CRB3624NR, CRB3624PR, CRB3630NR,
CRB3630PR, hrb3624nT, hrb3624pt, HRB3624NR AND HRB3624PR

This list contains replaceable parts used in your heater. When ordering parts, follow the instructions
listed under Replacement Parts on page 42 of this manual.

PART NUMBER
HRB3624NT
HRB3624PT
HRB3924NR
HRB3924PR
KEY CRB2618NR CRB3624NR CRB3630NR
NO. CRB2618PR CRB3624PR CRB3630PR

DESCRIPTION

1
2
3

Top Log (#1)
Bottom Log (#2)
Back Log (#3)

113620-01
113620-02
113620-03

119426-01A

113620-04
113620-05
113620-06

113620-07
113620-05
113620-09

www.desatech.com

QTY

1
1
1

Illustrated Parts Breakdown
Thermostat-controlled Models
VUL18NT, VUL18PT, VUL24NT, VUL24PT, VUL30NT, VUL30PT, HRB3624NT
AND HRB3624PT
8

3
8

6
11

LPG

5
7

2
23

1
8

24
13
18
22

21
17
20

www.desatech.com

15
14

119426-01A

PARTS LIST
Thermostat-controlled Models

Key
No. Part No.

1
2
3
4
5
6
7
8
9
10
11

13
14
15
16
17
18

19
20
21
22
23
24
25

**
111435-01
112465-01
112465-02
113242-01
113242-02
107485-01
107486-01
112713-01
112713-02
098249-01
M11084-26
112782-01
112782-02
M11084-38
101004-11
101004-10
101004-04
101004-02
101004-15
101004-11
101004-10
101004-22
101004-06
112708-02
099211-01
098544-01
099387-09
099387-14
101053-01
101329-21
101329-30
101329-31
101329-26
100000-01
102013-01
098354-01
112714-01
098271-12
098867-09
098867-10
112712-01

Description

VUL
18N
T
VUL
18P
T
VUL
24/3
0NT
VUL
24/3
0PT
HRB
3624
NT
HRB
3624
PT

This list contains replaceable parts used in your heater. When ordering parts, follow the instructions
listed under Replacement Parts on page 42 of this manual.

Qty.

•
•
•

•

Front Burner Injector, Natural
Front Burner Injector, Propane/LP
Front Burner Injector, Natural
Front Burner Injector, Propane/LP
Thermostat Burner Tube
Screw
Thermobulb Clip
Pilot Tube
Pilot Tube
Adapter
Thermostat Gas Valve (NG)
Thermostat Gas Valve (LP)
Thermostat Gas Valve (NG)
Thermostat Gas Valve (LP)
Cotter Pin
Control Rod
Control Knob
Thermostat Valve Bracket
Ignitor Cable
Gas Regulator, Natural Gas
Gas Regulator, Propane/LP
Inlet Tube

•

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1
1
1
1
1
1
1
1
1
1
2
10
1
1
2
1
1
1
1
1
1
1
1
1
1
2
1
1
1
1
1
1
1
1
1
1
1
1
1
1

•
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•
•
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1
1
1
1
1

PARTS AVAILABLE NOT SHOWN

100563-01 Warning Plate
101054-01 Lighting Instruction Plate
101137-02 Hardware Kit
GA6060
Lava Rock
102030-01 Auxiliary Thermostat Mtg. Clip
** Not a field replaceable part.
119426-01A

www.desatech.com

•
•
•
•
•

ILLUSTRATED PARTS BREAKDOWN
Remote-Ready Variable Control Models
VUL18NR, VUL18PR, VUL24NR, VUL24PR, VUL30NR, VUL30PR

3
4

8
6

LPG

5
8

14
14
14

12
15
10

16
20

www.desatech.com

119426-01A

PARTS LIST
Remote-Ready Variable Control Models

Key
No. Part No.

1
2
3
4
5
6
7
8
9
10
11

13
14
15
16
17
18
19
20
21
22
23
24

**
111435-01
112465-01
112465-02
113242-01
113242-02
103779-01
103778-01
112713-01
112713-03
098249-01
M11084-26
112782-03
112782-02
101480-12
101004-11
101004-10
101004-04
101004-02
101004-11
101004-10
101004-08
101004-06
112708-01
M12461-26
099918-02
099387-12
099387-09
098264-02
101329-21
101329-30
103784-01
103784-02
111173-01
112715-01
098271-12
100609-01
099387-14

Description

Ramp Burner Base
Electronic Ignitor
Ramp Front Burner
Ramp Front Burner
Ramp Back Burner Kit
Ramp Back Burner Kit
O.D.S. Pilot, Natural Gas
O.D.S. Pilot, Propane/LP Gas
Pilot Bracket, Natural Gas
Pilot Bracket, Propane/LP Gas
Nut, ODS
Screw
Air Deflactor Bracket
Air Deflactor Bracket
Jumper Wire
Rear Burner Injector, Natural
Rear Burner Injector, Propane/LP
Rear Burner Injector, Natural
Rear Burner Injector, Propane/LP
Front Burner Injector, Natural
Front Burner Injector, Propane/LP
Front Burner Injector, Natural
Front Burner Injector, Propane/LP
Remote Burner Tube
Screw
Pilot Regulator, Natural Gas
Pilot Tube, Natural Gas
Pilot Tube, Propane/LP
Male Fitting
Gas Control Valve (NG)
Gas Control Valve (LP)
Control Knob Extension
Flame Adjustment Knob Extension
Remote Valve Bracket
Remote Knob Heat Shield
Ignitor Cable
Pilot Tube, Natural Gas
Pilot Tube, Natural Gas

VUL
18N
R
VUL
18P
R
VUL
24/3
0NR
VUL
24P
/30P
R

This list contains replaceable parts used in your heater. When ordering parts, follow the instructions
listed under Replacement Parts on page 42 of this manual.

Qty.

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•
•
•
•
•
•
•
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•

•

1
1
1
1
1
1
1
1
1
1
2
8
1
1
1
1
1
1
1
1
1
1
1
1
5
1
1
1
1
1
1
1
1
1
1
1
1
1

PARTS AVAILABLE NOT SHOWN

112717-01 Remote Sensor Bracket
100563-01 Warning Plate
103877-01 Lighting Instruction Plate
100639-02 Caution Decal
101137-02 Hardware Kit
GA6060
Lava Rock
** Not a field replaceable part.

119426-01A

www.desatech.com

•
•
•
•
•
•

1
1
1
1
1
1

ILLUSTRATED PARTS BREAKDOWN
Remote-Ready Variable Control Models
CRB2618NR, CRB2618PR, CRB3624NR, CRB3624PR, CRB3630NR,
CRB3630PR, HRB3624NR AND HRB3624PR
8

3
4

8
6

LPG

5
8

14
14
14

12
15
10

16
20

www.desatech.com

119426-01A

PARTS LIST
Remote-Ready Variable Control Models

4
5
6
7
8
9
10
11

13
14
15
16
17
18
19
20
21
22
23
24

**
111435-01
112465-01
112465-02
113242-01
113242-02
103779-01
103778-01
112713-01
112713-03
098249-01
M11084-26
112782-01
112782-02
101480-12
101004-11
101004-10
101004-04
101004-02
101004-11
101004-10
101004-08
101004-06
112708-01
M12461-26
099918-02
099387-12
099387-09
098264-02
103781-01
103781-02
103784-01
103784-02
111173-01
112715-01
098271-12
100609-01
099387-14

Description

Ramp Burner Assembly
Electronic Ignitor
Ramp Front Burner
Ramp Front Burner
Ramp Back Burner Kit
Ramp Back Burner Kit
O.D.S. Pilot, Natural Gas
O.D.S. Pilot, Propane/LP Gas
Pilot Bracket, Natural Gas
Pilot Bracket, Propane/LP Gas
Nut, ODS
Screw
Air Deflactor Bracket
Air Deflactor Bracket
Jumper Wire
Rear Burner Injector, Natural
Rear Burner Injector, Propane/LP
Rear Burner Injector, Natural
Rear Burner Injector, Propane/LP
Front Burner Injector, Natural
Front Burner Injector, Propane/LP
Front Burner Injector, Natural
Front Burner Injector, Propane/LP
Remote Burner Tube
Screw
Pilot Regulator, Natural Gas
Pilot Tube, Natural Gas
Pilot Tube, Propane/LP
Male Fitting
Gas Control Valve (NG)
Gas Control Valve (LP)
Control Knob Extension
Flame Adjustment Knob Extension
Remote Valve Bracket
Remote Knob Heat Shield
Ignitor Cable
Pilot Tube, Natural Gas
Pilot Tube, Natural Gas

CRB

1
2
3

CRB

Key
No. Part No.

2618
NR
2618
PR
HRB
3
CRB 924NR
/
3624
/30N
HRB
R
3
CRB 924PR
/
3924
/30P
R

This list contains replaceable parts used in your heater. When ordering parts, follow the instructions
listed under Replacement Parts on page 42 of this manual.

•
•
•

•

•
•

•
•
•

•
•

•

Qty.

•
•

•

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•

1
1
1
1
1
1
1
1
1
1
2
8
1
1
1
1
1
1
1
1
1
1
1
1
5
1
1
1
1
1
1
1
1
1
1
1
1
1

PARTS AVAILABLE NOT SHOWN

112717-01 Remote Sensor Bracket
100563-01 Warning Plate
103877-01 Lighting Instruction Plate
100639-02 Caution Decal
101137-02 Hardware Kit
GA6060
Lava Rock
111910-01 Thermostat Remote Kit
** Not a field replaceable part.
119426-01A

www.desatech.com

•
•
•
•
•
•
•

1
1
1
1
1
1
1

Service Hints
When Gas Pressure Is Too Low
• pilot will not stay lit
• burners will have delayed ignition
• heater will not produce specified heat
• propane/LP gas supply may be low
You may feel your gas pressure is too low. If so, contact your local propane/LP or natural gas supplier.

Accessories

Purchase these heater accessories from your local
dealer. If they can not supply these accessories,
call DESA Heating Products at 1-866-672-6040
for referral information. You can also write to the
address listed on the back page of this manual.

Technical Service

You may have further questions about installation,
operation or troubleshooting. If so, contact DESA
Heating Products’ Technical Service Department
at 1-866-672-6040. When calling please have your
model and serial numbers of your heater ready.
You can also visit DESA Heating Products’ technical services web site at www.desatech.com.

Replacement Parts

EQUIPMENT SHUTOFF VALVE
GA5010

For all models. Equipment shutoff valve with 1/8"
NPT tap. Fits 1/2" NPT pipe.

Note: Use only original replacement parts. This
will protect your warranty coverage for parts
replaced under warranty.

Parts Under Warranty

Contact authorized dealers of this product. If
they can’t supply original replacement part(s),
call DESA Heating Products’ Technical Service
Department at 1-866-672-6040.
When calling DESA Heating Products, have
ready
• your name
• your address
• model and serial numbers of your heater
• how heater was malfunctioning
• type of gas used (propane/LP or natural gas)
• purchase date
Usually, we will ask you to return the part to the
factory.

FIREPLACE HOOD
Black - GA6050
Brass - GA6052
Antique Brass - GA6053
For all models. Helps deflect heat away from
mantel or wall above fireplace. Fits openings 28"
to 48" wide.

Parts Not Under Warranty

Contact authorized dealers of this product. If they
can’t supply original replacement part(s), call
DESA Heating Products at 1-866-672-6040 for
referral information.
When calling DESA Heating Products, have
ready
• model number of your heater
• the replacement part number

www.desatech.com

119426-01A

VENT-FREE LOGMATE® FIREBOXES

Accessories

(Not Shown)
Available in 32", 36" and 42" models. Circulating fireboxes feature louvers and an optional
blower. Non-circulating, smooth face models are
ideal for custom trim applications such as stone
or marble.

Continued

RECEIVER AND HAND-HELD
THERMOSTAT REMOTE CONTROL
KIT - hrc200

For all Remote-Ready Models. Allows the fireplace to be operated in a manually or thermostatically controlled mode. You can turn the fireplace
on and off without ever leaving the comfort of
your easy chair. A wall-mount docking station
is included.

FB32C (CIRCULATING), FB32NC
(NON-CIRCULATING) SERIES
Fireboxes
(Not Shown)
For 18" and 24" log models.

FB36CA, FB42C SERIES CIRCULATING),
FB36NCA, FB42NC SERIES fireboxes
(NON-CIRCULATING)
(Not Shown)
For all log models.

DAMPER CLAMP - GA6080
(Not Shown)
For Remote-Ready Models. Permanently opens
chimney flue damper for vented operation.

LAVA ROCK - GA6060
RECEIVER AND HAND-HELD
REMOTE CONTROL KIT - HRC100

For all Remote-Ready Models. Allows the fireplace to be turned on and off by using a hand-held
remote control. A wall-mount docking station is
included.

WALL-MOUNT THERMOSTAT
SWITCH - GWMT1
(Not Shown)
For all Remote-Ready Models. The desired comfort setting can be selected on the wall thermostat
and the log heater will automatically cycle from
pilot to the heat setting selected.

WALL-MOUNT ON/OFF SWITCH
GWMS2
(Not Shown)
For all Remote-Ready Models. Allows the gas
log heater to be turned on and off with a wall
switch.

119426-01A

(Not Shown)
For all models. Order when additional rock is
desired. (1.8 lb. bag)

CLEANING KIT - GCK
(Not Shown)
For all models. Your vent-free gas appliance requires regular cleaning and maintenance to prevent
performance problems. This kit gives you the tools
and instructions to make it easy to clean all critical
areas of your appliance.

Information video - 108917-01

For all models. A care and maintenance video is
available by calling 1-866-672-6040. You may also
email your request to
productsupport@desaint.com.

Fire Crackle - CF6-A
(Not Shown)
For all models. Creates the sound of a real burning fire.

www.desatech.com

Warranty Information
KEEP THIS WARRANTY
Model
Serial No.
Date Purchased
Always specify model and serial numbers when communicating with the factory.

We reserve the right to amend these specifications at any time without notice. The only warranty applicable is our
standard written warranty. We make no other warranty, expressed or implied.

LIMITED WARRANTY
VENT-FREE GAS LOG HEATERS

DESA Heating Products warrants this product to be free from defects in materials and components for four (4) years
from the date of first purchase, provided that the product has been properly installed, operated and maintained in
accordance with all applicable instructions. To make a claim under this warranty the Bill of Sale or cancelled check
must be presented.
This warranty is extended only to the original retail purchaser. This warranty covers the cost of part(s) required
to restore this heater to proper operating condition and an allowance for labor when provided by a DESA Heating
Products Authorized Service Center. Warranty part(s) MUST be obtained through authorized dealers of this product
and/or DESA Heating Products who will provide original factory replacement parts. Failure to use original factory
replacement parts voids this warranty. The heater MUST be installed by a qualified installer in accordance with
all local codes and instructions furnished with the unit.
This warranty does not apply to parts that are not in original condition because of normal wear and tear or parts
that fail or become damaged as a result of misuse, accidents, lack of proper maintenance or defects caused by
improper installation. Travel, diagnostic cost, labor, transportation and any and all such other costs related to
repairing a defective heater will be the responsibility of the owner.

TO THE FULL EXTENT ALLOWED BY THE LAW OF THE JURISDICTION THAT GOVERNS THE SALE
OF THE PRODUCT; THIS EXPRESS WARRANTY EXCLUDES ANY AND ALL OTHER EXPRESSED
WARRANTIES AND LIMITS THE DURATION OF ANY AND ALL IMPLIED WARRANTIES, INCLUDING WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE TO FOUR
(4) YEARS ON ALL COMPONENTS FROM THE DATE OF FIRST PURCHASE; AND DESA HEATING
PRODUCTS’ LIABILITY IS HEREBY LIMITED TO THE PURCHASE PRICE OF THE PRODUCT AND
DESA HEATING PRODUCTS SHALL NOT BE LIABLE FOR ANY OTHER DAMAGES WHATSOEVER
INCLUDING INDIRECT, INCIDENTAL OR CONSEQUENTIAL DAMAGES.
Some states do not allow a limitation on how long an implied warranty lasts or an exclusion or limitation of
incidental or consequential damages, so the above limitation on implied warranties or exclusion or limitation on
damages may not apply to you.
This warranty gives you specific legal rights and you may also have other rights that vary from state to state.
For information about this warranty write:

2701 Industrial Drive
P.O. Box 90004
Bowling Green, KY 42102-9004
www.desatech.com

119426 01

NOT A UPC

119426-01
Rev. A
05/06

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Desa Hrb3624 Users Manual

HRB3624 1af57e6a-cb74-9ec4-c5ed-f8c5f94ce2e9

VUL18, VUL24, VUL30 to the manual 1af57e6a-cb74-9ec4-c5ed-f8c5f94ce2e9

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