Desa VRL24PR, CSG3924NR, CSG3924PR, CTB3924NR, CSG3930NR Owner's Operating & Installation Manual

Save this manual for future reference.

For more information, visit www.desatech.com

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 quali-

fied installer, service agency or the gas supplier.

Patent Pending

UNVENTED (VENT-FREE) GAS LOG HEATER

OWNER’S OPERATION AND INSTALLATION MANUAL

24" AND 30" REMOTE-READY MODELS:

VRL24NR, VRL24PR, VRL30NR, VRL30PR, CSG3924NR,

CSG3924PR, CTB3924NR, CTB3924PR, CSG3930NR, CSG3930PR

24" AND 30" THERMOSTAT MODELS:

VRL24NT, VRL24PT, VRL30NT, VRL30PT, CSG3924NT, CSG3924PT,

CTB3924NT, CTB3924PT

Remote-Ready Models Also Design-Certified As Vented Decorative Appliances

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110021-01H

2

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

TABLE OF CONTENTS

Safety Information ............................................... 3

Product Identification ...........................................

5

Optional Remote Control Accessories .................

5

Local Codes ........................................................ 5

Unpacking ........................................................... 6

Product Features ................................................. 6

Air For Combustion and Ventilation .....................

6

Installation ........................................................... 8

Operating Heater ............................................... 20

Inspecting Burners ............................................ 25

Cleaning and Maintenance ................................ 26

Troubleshooting .................................................

28

Optional Positioning of Thermostat Sensing Bulb

.. 32

Wiring Diagram .................................................. 33

Specifications ....................................................

34

Illustrated Parts Breakdown .............................. 35

Replacement Parts ............................................ 40

Technical Service ..............................................

40

Service Hints ..................................................... 40

Accessories ....................................................... 41

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110021-01H 3

SAFETY INFORMATION

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

WARNING: Do not use a
blower insert, heat exchanger
insert or other accessory not ap

-

proved for use with this heater.

WARNING: This appliance is
for installation only in a solid-fuel
burning fireplace or approved
ventless firebox enclosure.

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, keep se

­lector switch in the OFF position
to prevent children from turning
on burners with remote.

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

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110021-01H

4

SAFETY INFORMATION

Continued

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 or furniture.

10. This heater needs fresh, outside air ventilation
to run properly. This heater has an Oxygen De

­pletion Sensing (ODS) safety shutoff system.
The ODS shuts down the heater if not enough
fresh air is 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 do not need to be con

-

nected to any external electrical source.

18. Operating heater above elevations of 4,500
feet could cause pilot outage.

19. To prevent performance problems with pro

­pane/LP models, do not use propane/LP fuel
tank of less than 100 lb. capacity.

20. Provide adequate clearances around air
openings.

Keep the appliance area clear
and free from combustible ma­terials, gasoline and other flam

-

mable vapors and liquids.

1. This appliance is only for use with the type of
gas indicated on the rating plate. This appliance
is not convertible for use with other gases.

2. Do not place propane/LP supply tank(s) in

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

3. If you smell gas

• shut off gas supply

• do not try to light any appliance

• do not touch any electrical switch; do not

use any phone in your building

• immediately call your gas supplier from

a neighborʼs phone. Follow the gas
supplierʼs instructions

• if you cannot reach your gas supplier, call

the fire department

4. This heater shall not be installed in a bedroom
or bathroom unless installed as a vented appli

­ance. See Installing Damper Clamp Accessory
for Vented Operation, page 13 (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 and firebox
for damage. If damaged, repair flue 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.

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110021-01H 5

OPTIONAL REMOTE

CONTROL ACCESSORIES

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

• wall switch • hand-held ON/OFF remote

• wall thermostat • hand-held thermostat remote

See Accessories, page 41.

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

LOCAL CODES

Install and use heater with care. Follow all local
codes. In the absence of local codes, use the lat

-

est edition of The National Fuel Gas Code ANSI

Z223/NFPA 54*.

*Available from:

American National Standards Institute, Inc.

1430 Broadway

New York, NY 10018

National Fire Protection Association, Inc.

Batterymarch Park

Quincy, MA 02269

Note: Where listed vented decorative logs are
required, thermostat models are not permitted.

PRODUCT

IDENTIFICATION

Base
Assembly

Piezo
Ignitor

Front and Rear
Burner Control
Knob

Selector Switch
(Optional)

ON/OFF/
PILOT
Knob

Remote Control
(Optional)

Grate

Front
Burner

Remote-Ready Models

Rear
Burner

Figure 1 - Product Identification

Log Set (Varies
According to Model)

Base
Assembly

Front and Rear
Burner Control Knob

Piezo
Ignitor

Burner
Control
Knob

Thermostat Models

Grate

Pilot
Assembly

Middle
Burner

State of Massachusetts: The installa­tion must be made by a licensed plumber
or gas fit ter 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.

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110021-01H

6

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 the sides of
assembly.

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.

PRODUCT FEATURES

OPERATION

This heater is clean burning. It requires no outside
venting. There is no heat loss out a vent or up a
chimney. Heat is generated by both realistic 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
(Remote-Ready 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.

PIEZO IGNITION SYSTEM

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

AIR FOR COMBUSTION

AND VENTILATION

WARNING: This heater shall
not be installed in a confined
space or unusually tight con

­struction unless provisions are
provided for adequate combus

­tion and ventilation air. Read the
following instructions to insure
proper fresh air for this and
other fuel-burning appliances
in your home.

Todayʼs homes are built more energy efficient
than ever. New materials, increased insulation and
new construction methods help reduce heat loss
in homes. Home owners weather strip and caulk
around windows and doors to keep the cold air out
and the warm air in. During heating months, home
owners want their homes as airtight as possible.

While it is good to make your home energy effi

­cient, your home needs to breathe. Fresh air must
enter your home. All fuel-burning appliances need
fresh air for proper combustion and ventilation.

Exhaust fans, fireplaces, clothes dryers and fuel
burning appliances draw air from the house to
operate. You must provide adequate fresh air for
these appliances. This will insure proper venting
of vented fuel-burning appliances.

PROVIDING ADEQUATE
VENTILATION

The following are excerpts from National Fuel
Gas Code. ANSI Z223.1/NFPA 54, Section 5.3,
Air for Combustion and Ventilation.

All spaces in homes fall into one of the three fol

­lowing ventilation classifications:

1. Unusually Tight Construction

2. Unconfined Space

3. Confined Space

The information on pages 6 through 8 will help
you classify your space and provide adequate
ventilation.

Unusually Tight Construction

The air that leaks around doors and windows
may provide enough fresh air for combustion and
ventilation. However, in buildings of unusually
tight construction, you must provide additional
fresh air.

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110021-01H 7

AIR FOR COMBUSTION

AND VENTILATION

Continued

40,000

31,500

71,500

Unusually tight construction is defined as
construction where:

a. walls and ceilings exposed to the out

­side atmosphere have a continuous
water vapor retarder with a rating of
one perm (6x10

-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.

Confined Space and Unconfined Space

The National Fuel Gas Code ANSI Z223.1/NFPA
54 defines a confined space as a space whose

volume is less than 50 cubic feet per 1,000 Btu
per hour (4.8 m

3

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 FIREPLACE LOCATION

Determining if You Have a Confined or
Unconfined Space

Use this work sheet to determine if you have a
confined or unconfined space.

Space: Includes the room in which you will install
fireplace plus any adjoining rooms with doorless 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) = 2,560 cu. ft.
(volume of space)

If additional ventilation to adjoining room is

supplied with grills or openings, add the volume
of these rooms to the total volume of the space.

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

__________ (volume of space) x 20 = (Maxi-

mum Btu/Hr the space can support)

Example: 2,560 cu. ft. (volume of space) x 20 =

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

3. Add the Btu/Hr of all fuel burning appliances in
the space.

Vent-free fireplace

__________ Btu/Hr

Gas water heater*

__________ Btu/Hr

Gas furnace

__________ Btu/Hr

Vented gas heater

__________ Btu/Hr

Gas fireplace logs

__________ Btu/Hr

Other gas appliances* +

__________ Btu/Hr

Total =

__________ Btu/Hr

* Do not include direct-vent gas appliances. Di

­rect-vent draws combustion air from the outdoors
and vents to the outdoors.

Example:

Gas water heater

__________ Btu/Hr

Vent-free fireplace +

__________ Btu/Hr

Total =

__________ Btu/Hr

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

_________

Btu/Hr (maximum the space can support)

_________

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

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

can support)

79,000 Btu/Hr (actual amount of

Btu/Hr used)

The space in the example is a confined space because
the actual Btu/Hr used is more than the maximum
Btu/Hr the space can support. You must provide ad

-

ditional fresh air. Your options are as follows:

A. Rework worksheet, adding the space of an adjoin

­ing room. If the extra space provides an unconfined
space, remove door to adjoining room or add
ventilation grills between rooms. See Ventilation
Air From Inside Building, page 8.

B. Vent room directly to the outdoors. See Ventila

­tion Air From Outdoors, page 8.

C. Install a lower Btu/Hr fireplace, if lower Btu/Hr

size makes room unconfined.

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110021-01H

8

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.

AIR FOR COMBUSTION

AND VENTILATION

Continued

Figure 2 - Ventilation Air from Inside

Building

Figure 3 - Ventilation Air from Outdoors

Outlet
Air

Ventilated
Attic

Outlet

A

ir

Inlet
Air

Inlet Air

Ve

ntilated

Crawl Space

To

Crawl

Space

To Attic

Or

Remove
Door into
Adjoining

Room,
Option

3

Ventilation Grills

Into Adjoining Room,

Option

2

Ve

ntilation

Grills

Into Adjoining

Room,

Option 1

12"

12"

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 oper

­ated is smaller than that defined
as an unconfined space or if the
building is of unusually tight
construction, provide adequate
combustion and ventilation air
by one of the methods described
in the National Fuel Gas Code,

ANSI Z223.1/NFPA 54 Section 5.3

or applicable local codes.

VENTILATION AIR

Ventilation Air From Inside Building

This fresh air would come from an adjoining un­confined space. When ventilating to an adjoining
unconfined space, you must provide two perma­nent openings: one within 12" of the ceiling and
one within 12" of the floor on the wall connecting
the two spaces (see options 1 and 2, Figure 2). You
can also remove door into adjoining room (see
option 3, Figure 2). Follow the National Fuel Gas

Code ANSI Z223.1/NFPA 54, Section 5.3, Air for
Combustion and Ventilation for required size of

ventilation grills or ducts.

Ventilation Air From Outdoors

Provide extra fresh air by using ventilation grills or
ducts. You must provide two permanent openings:
one within 12" of the ceiling and one within 12"
of the floor. Connect these items directly to the
outdoors or spaces open to the outdoors. These
spaces include attics and crawl spaces. Follow the

National Fuel Gas Code ANSI Z223.1/NFPA 54,
Section 5.3, Air for Combustion and Ventilation for

required size of ventilation grills or ducts.
IMPORTANT: Do not provide openings for inlet

or outlet air into attic if attic has a thermostat­controlled power vent. Heated air entering the attic
will activate the power vent.

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110021-01H 9

WARNING: Installation and

repair should be done by a quali

­fied service person. The appliance
should be inspected before use and
at least annually by a professional
service person. More frequent
cleaning may be required due to
excessive lint from carpeting, bed­ding material, etc. It is imperative
that control compartments, burners
and circulating air passageways of
the appliance be kept clean.

NOTICE: State or local codes may
only allow operation of this appli

­ance in a vented configuration.
Check your state or local codes
(Remote-Ready Models Only).

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, creo

­sote, ashes and loose paint by a
qualified chimney cleaner. Creo

­sote will ignite if highly heated. A
dirty chimney flue may create and
distribute soot within the house.
Inspect chimney flue and firebox
for damage. If damaged, repair
flue 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.

INSTALLATION

Continued

WARNING: Never install the

heater

• in a bedroom or bathroom
unless installed as a vented
appliance, see page 13 (Re­mote-Ready Models Only)

• in a recreational vehicle

• where curtains, furniture,
clothing or other flammable
objects are less than 42 inches
from the front, top or sides of
the firebox opening

• in high traffic areas

• in windy or drafty areas

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 flu

­ids, oil or kerosene lamps, etc.) in
the air exist, may discolor walls
or cause odors.

IMPORTANT: Vent-free heaters add moisture to
the air. Although this is 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 only the correct gas type (natural or pro­pane/LP) for your unit. If your gas supply is not
correct, 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.

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110021-01H

10

LOG SIZING REQUIREMENTS

Minimum Firebox Size
Log Front Rear

Size Height Depth Width Width*

24" 17" 14" 28" 20

1

/4"

30" 17" 14" 34" 22

3

/8"

*Measured at 14" Depth

Figure 4 - Minimum Clearance for

Combustible to Wall

*Minimum 16 inches from Side Wall

*

Example

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 13.

Minimum Noncombustible Material
Clearances

If Not Using Mantel

Note: If using a mantel, proceed to If Using
Mantel below. If not using a mantel, follow the

information below.

You must have noncombustible material(s) above
the fireplace opening. Noncombustible materials
(such as slate, marble, tile, etc.) must be at least
1/2 inch thick. With sheet metal, you must have
noncombustible material behind it. Noncom

­bustible material must extend at least 8" up. If
noncombustible material is less than 12", you must
install the fireplace hood accessory. See Figure 5,
page 11, 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 13.

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 inch thick. With sheet metal, you must have
noncombustible material behind it. Noncombustible
material must extend at least 8 inches up (for all
models). If noncombustible material is less than
12", you must install the fireplace hood accessory
(24" model only). Even if noncombustible material
is more than 12", you may need the hood accessory
to deflect heat away from your mantel shelf. See
Figures 5 and 6, page 11 and Figure 7 page 12,
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 13.

INSTALLATION AND CLEARANCES
(Vent-Free Operation Only)

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

INSTALLATION

Continued

Carefully follow the instructions below. This will
ensure safe installation into a masonry, UL127­listed manufactured fireplace or certified 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
manufacturerʼs 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 inches.

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110021-01H 11

Noncombustible Requirements for
Material Distance (A) Safe Installation

12" or more Noncombustible material okay.
Between 8" Install fireplace hood and 12"

accessory (GA6050, GA6052 or
GA6053, see Accessories, page 41).

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.

INSTALLATION

Continued

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).

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

Figure 6 - Minimum Mantel Clearances Without Using Hood

Minimum Non­Combustible
Material

Minimum Non­Combustible
Material Height

Distances to
Underside of
Mantel

Top of Fireplace
Opening

Underside of
Mantel Shelf

Mantel Shelf

12"

(A)

18"

20"

22"

24"

All minimum
distances are
in inches

Log Set

All Models

2

1

/2

"

6"

8"

10"

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110021-01H

12

Minimum
Noncombustible
Material

8"
Min.

12"

15"

18"

All minimum
distances are
in inches

20"

2

1

/2"

6"

8"

10"

12"

Distances to
Underside of
Mantel

Hood
(GA6050,
GA6052 or
GA6053)

Top of
Fireplace
Opening

Underside
of Mantel
Shelf

Mantel Shelf

INSTALLATION

Continued

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 when using a hood.

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

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).

Hearth

5"
Min.

Combustible
Material

14"
Min.

Combustible
Material

Noncombustible Material

Figure 8 - Minimum Fireplace Clearances

If Installed at Floor Level

Figure 9 - Minimum Fireplace Clearances

Above Combustible Flooring

Figure 7 - Minimum Mantel Clearances When Using Hood

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110021-01H 13

Area of Various Standard Round Flues

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

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

Chimney Minimum Permanent
Height (ft.) Flue Opening (sq. ins.)

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

Figure 10 - Attaching Damper Clamp

Manufactured

Fireplace

Masonry Fireplace

Damper

Damper
Clamp

Damper

Damper

INSTALLING DAMPER CLAMP
ACCESSORY FOR VENTED
OPERATION

(Remote-Ready Models Only)

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 41). 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.

INSTALLATION

Continued

INSTALLING HEATER BASE
ASSEMBLY

CAUTION: Do not remove the
data plates attached to the heater
base assembly. The data plates
contain important warranty and
safety information.

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 the
burner. This could damage
heater. Only handle base as

-

sembly by grates.

www.desatech.com

110021-01H

14

INSTALLATION

Continued

IMPORTANT: Make sure the heater burners are
level. If heater is not level, heater will not work
properly. For thermostat models, avoid damage
to thermostat bulb. Avoid nicks or sharp bends
in thermostat bulb wire. Keep thermostat bulb
in mounting bracket until ready to mount base
to floor. See Optional Positioning Of Thermostat
Sensing Bulb, page 32.

Installation Items Needed

• hardware package (provided with heater)

• approved flexible gas hose (not provided) (if
allowed by local codes)

•

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

• electric drill with 3/16" drill bit

• flathead screwdriver

1. Connect fitting to base as shown in Figure 11.

Connect approved flexible gas hose to fitting
in base (see Figure 11).

IMPORTANT: Hold gas fitting with wrench

when connecting flexible gas hose.

2.

Locate two masonry screws in hardware package.

3. Place heater base in fireplace.

4. Place logs in their proper position on heater

base (see Installing Logs, page 18).

5. Center heater base and logs front-to-back and

side-to-side in fireplace.

6. Carefully remove logs without moving heater

base.

7. Mark screw locations through one hole on each

side of the mounting bracket (see Figure 12).
If installing in a brick-bottom fireplace, mark
screw locations in mortar joint of bricks.

8. Remove heater base from fireplace. If installing

optional control accessories, do so at this time.
Follow all directions provided with accessory.

9. Drill holes at marked locations using 3/16"

drill bit.

10. Attach base assembly to fireplace floor using

two masonry screws (in hardware package).

CONNECTING TO GAS SUPPLY

WARNING: This appliance
requires a 1/2" NPT (National
Pipe Thread) inlet connection to
the pressure regulator.

WARNI NG: A qualif i ed
service person must connect
heater to gas supply. Follow
all local codes.

CAUTION: Never connect
propane/LP heater directly to the
propane/LP supply. Propane/LP
heaters require an external regu

­lator (not supplied). Install the
external regulator between the
heater and propane/LP supply.

WARNING: For natural gas
units, never connect heater to
private (non-utility) gas wells.
This gas is commonly known
as wellhead gas.

Figure 11 - Attaching Flexible Gas Hose

to Heater

Fitting

Flexible Gas Hose
(if allowed by local
codes)

Figure 12 - Attaching Base Assembly to

Fireplace Floor (30" Model Shown)

Masonry Screw

Mounting
Flange

www.desatech.com

110021-01H 15

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

* 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 41.

For propane/LP gas, the installer must supply an
external regulator. The external regulator will
reduce incoming gas pressure. You must reduce
incoming gas pressure to between 11 and 14 inches
of water. If you do not reduce incoming gas pres

­sure, heater regulator damage could occur. Install
external regulator with the vent pointing down
as shown in Figure 13. 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.

INSTALLATION

Continued

Figure 13 - External Regulator With Vent

Pointing Down

Installation must include a 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 Figure 14 or 15, page
16, depending on your model).

IMPORTANT: Install equipment shutoff valve in an
accessible location. The main gas valve is for turn

-

ing on or shutting off the gas to the appliance.

Check your building codes for any special re

­quirements for locating equipment shutoff valve
to fireplaces.

Apply pipe joint sealant lightly to male NPT
threads. This will prevent excess sealant from
going into pipe. Excess sealant in pipe could result
in clogged heater valves.

WARNING: Use pipe joint
sealant that is resistant to liquid
petroleum (LP) gas.

We recommend that you install sediment trap
in supply line as shown in Figure 14 or 15, page
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 (Thermo­stat-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).

Propane/LP
Supply Tank

External
Regulator

Vent
Pointing
Down

www.desatech.com

110021-01H

16

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 commercial leak de

­tection solution to all joints.
Bubbles forming show a leak.
Correct all leaks at once.

CAUTION: For propane/LP

units, make sure external regula

­tor has been installed between
propane/LP supply and heater.
See guidelines under Connecting
to Gas Supply, page 13.

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. 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 a commercial leak detection solution
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.

* Purchase the optional CSA design-certified
equipment shutoff valve from your dealer. See
Accessories, page 41.

** Minimum inlet pressure for purpose of input
adjustment.

Figure 15 - Gas Connection (Remote-

Ready Models Only)

Gas Control Valve

Tee Pipe Cap
Joint Nipple

3" Minimum

Sediment Trap

PROPANE/LP From

External Regulator
(11" W.C.** to
14" W.C. Pressure)

NATURAL From Gas

Meter (5" W.C.**
to 10.5" W.C.
Pressure)

CSA Design-Certified
Equipment Shutoff Valve
With 1/8" NPT Tap*

Approved
Flexible Gas
Hose (if allowed
by local codes)

Figure 14 - Gas Connection

Cap Pipe Tee
Nipple Joint

3" Min.

Sediment Trap

Gas
Regulator

CSA Design-Certified
Equipment Shutoff Valve
With 1/8" NPT Tap*

Approved Flexible Gas
Hose (if allowed by
local codes)

Natural From Gas
Meter (5" W.C.**
to 10.5" W.C.
Pressure)

Propane/LP

From External
Regulator
(11" W.C.**
to 14" W.C.
Pressure

www.desatech.com

110021-01H 17

Test Pressures Equal To or Less Than
1/2 PSIG (3.5 kPa)

1. Close equipment shutoff valve (see Figure 16).

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 for natural gas
or propane/LP supply to equipment shutoff
valve (see Figure 17 or 18). Apply a com

­mercial leak detection solution 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 16).

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 (Thermostat­Controlled Models) or control valve (Remote­Ready Models) (see Figure 17 or 18). Apply a
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).
Check all other internal joints for leaks.

7. Turn off heater (see To Turn Off Gas to Ap

-

pliance, page 21 [thermostatically-controlled

models] or page 24 [remote-ready models]).

Figure 16 - Equipment Shutoff Valve

Equipment
Shutoff Valve

Propane/LP
Supply
Tank

Thermostat Gas
Valve or Control
Valve Location

Figure 18 - Checking Gas Joints

(Natural Gas Only)

Gas Meter

Equipment
Shutoff Valve

Figure 17 - Checking Gas Joints

(Propane/LP Gas Only)

Open

Closed

Equipment
Shutoff Valve

INSTALLATION

Continued

Thermostat Gas
Valve or Control
Valve Location

www.desatech.com

110021-01H

18

INSTALLATION

Continued

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.

CAUTION: After installa­tion and periodically thereafter,
check to ensure that no flame
comes in contact with any log.
With the heater set to High, check
to see if flames contact any log. If
so, reposition logs according to
the log installation instructions
in this manual. Flames contact

-

ing logs will create soot.

It is very important to install the logs exactly as
instructed. Do not modify logs. Only use logs sup

­plied with heater. Before installing logs, make sure
log alignment screws are in place and straight.

Models CSG3924NT, CSG3924PT,
CSG3924NR, CSG3924PR, CTB3924NT,
CTB3924PT, CTB3924NR CTB3924PR,
CSG3930NR and CSG3930PR,

1. Place log #1 (ember bed) onto base over align

-

ment screws to left of front burner and behind
middle burner. Log #1 will sit on top of front
and middle burners (see Figure 19).

2. Place log #2 to the right of log #1. Log #2 will

wrap around right end of rear burner and sit
on log alignment screw (see Figure 20).

3. Place log #3 on left side of base and onto

alignment screw to right of rear burner (see
Figure 20). Log #3 will wrap around left end
of rear burner.

4. Place log #4 onto two alignment screws to the

rear of base (see Figure 21).

Figure 19 - Installing Log #1 (Ember Bed)

(Model CSG3924NR Shown)

Log #1

Log #5 will
seat in this
location.

Figure 20 - Installing Log #2 (Right) and

Log #3 (Left) (Model CSG3924NR Shown)

Figure 21 - Installing Log #4 (Model

CSG3924NR Shown)

Log #4

Log #3

Log #1

Log #2

Log #3

Log #1

Log #2

www.desatech.com

110021-01H 19

INSTALLATION

Continued

Figure 22 - Installing Log #5 (Right) and

Log #6 (Left) (Model CSG3924NR Shown)

Log #5

Log #6

Log #4

Log #3

Log #1

Log #2

5. Place back of log #5 on notch in log #4 (as

shown in Figure 22), across back part of log
#1 and onto pin on log #2 (see Figure 20, page
18 and Figure 22).

6. Place log #6 onto two pins on log #1 (ember

bed) and rest back of log #6 on back log #4
(see Figure 22).

Figure 23 - Installing Log #2 (Right) and

Log #3 (Left) (Model VRL30NR Shown)

Figure 24 - Installing Log #4 (Model

VRL30NR Shown)

Figure 25 - Installing Log #5 and Log #6

(Model VRL30NR Shown)

Log #6

Log #5

Log #2

Log #4

Log #3

Log #1

Log #2

Log #3

Log #1

Log #4

Log #2

Log #3

Log #1

Models VRL24NR, VRL24PR, VRL30NR,
VRL30PR, VRL24NT, VRL24PT, VRL30NT
and VRL30PT

1. Place log #1 (ember bed) onto base over log

alignment screws to the left of front burner
and behind middle burner. Log #1 will sit on
top of front and middle burners (see Figure
19, page 18).

2. Place log #2 to right of log #1 and onto log

alignment screw as shown in Figure 23. Log
#2 will wrap around right end of rear burner
(see Figure 23).

3. Place log #3 on left side of base and onto

alignment screw to right of rear burner (see
Figure 23). Log #3 will wrap around left end
of rear burner.

4. Place log #4 onto two alignment screws to rear

of base (see Figure 24).

5. Locate hole on bottom of log #5 and place over

pin on log #2. Log #5 will rest on back of log
#1 (ember bed). See Figure 19, page 18 and
Figure 25.

6. Place log #6 onto two pins on log #1 (ember

bed) and rest back of log #6 on back log #4
(see Figure 25).

www.desatech.com

110021-01H

20

WHAT TO DO IF YOU SMELL GAS

• Do not try to light any appliance.

• Do not touch any electric switch; do not
use any phone in your building.

• Immediately call your gas supplier
from a neighborʼs phone. Follow the
gas supplierʼs instructions.

• If you cannot reach your gas supplier,
call the fire department.

C. Use only your hand to push in or turn the

gas control knob. Never use tools. If the
knob will not push in or turn by hand, donʼt
try to repair it, call a qualified service tech

­nician or gas supplier. Force or attempted
repair may result in a fire or explosion.

D.

Do not use this appliance if any part has been
under water. Immediately call a qualified
service technician to inspect the appliance and
to replace any part of the control system and
any gas control which has been under water.

LIGHTING

INSTRUCTIONS

WARNING:

• If fireplace has glass doors,
never operate this heater with
glass doors closed. If you op

­erate 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 run

-

ning 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.

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.

Figure 26 - Attaching Grate to Base

Assembly (Logs and Base Will Vary

According to Model)

Grate

Slots in Base

ATTACHING GRATE TO BASE
ASSEMBLY

Locate the two slots in the front of the base as­sembly. Carefully slide the decorative grate into
these slots (see Figure 26).

ADDING LAVA ROCK

Place lava rock around base of heater if desired.
Be sure not to cover the control knobs or air inlet
openings on the front of heater.

INSTALLATION

Continued

www.desatech.com

110021-01H 21

OPERATING HEATER

Continued

Note: Home owners generally prefer to op-

erate their heater with the chimney damper
closed. This will put all the heat into the room.
However, there may be times you will desire
the full 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 page 20.

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 on page 20. If you donʼt
smell gas, go to the next step.

5. Turn control knob counterclockwise
to the PILOT position. Press in control
knob for five (5) seconds (see Figure 27).

Note: You may be running this heater for

the first time after hooking up to gas sup

­ply. If so, the control knob may need to be
pressed in for 30 seconds or more. This will
allow air to bleed from the gas system.

6. With thermostat 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 minute for system to reset
before lighting pilot again.

8. Turn control knob counterclockwise
to desired heating level. The front burner
should light. Set control knob to any heat
level between HI and LO.

9. To light the rear yellow flame burner, push
in and turn rear burner control knob coun

-

terclockwise

to the ON position.

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

O

F

F

P

I

L

O

T

L

O

H

I

AUTO

OF

F

ON

O

N

Figure 27 - Control Knob(s) and Ignitor

Button Locations

Models: CSG3924NT, CSG3924PT,

VRL24NT, VRL24PT, VRL30NT and

VRL30PT

Ignitor Button

Control Knob

Rear Burner
Control Knob

Figure 28 - Pilot

(Propane/LP)

Ignitor Electrode

Figure 29 - Pilot

(Natural)

Ignitor
Electrode

Pilot
Burner

Thermocouple

Thermocouple

TO TURN OFF GAS

TO APPLIANCE

Shutting Off Heater

1. Turn control knob clockwise

to the

OFF position.

2. Turn rear burner control knob clockwise
to the OFF position.

Shutting Off Burners Only (pilot stays lit)

1. Turn control knob clockwise to the

PILOT position.

2. Turn rear burner control knob clockwise
to the OFF position.

www.desatech.com

110021-01H

22

OPERATING HEATER

Continued

FOR YOUR SAFETY

READ BEFORE LIGHTING

WARNING: If you do not fol­low these instructions exactly,
a fire or explosion may result
causing property damage, per

-

sonal injury or loss of life.

A. This appliance has a pilot which must be

lighted by hand. When lighting the pilot,
follow these instructions exactly.

B. BEFORE LIGHTING smell all around the

appliance area for gas. Be sure to smell next
to the floor because some gas is heavier than
air and will settle on the floor.

WHAT TO DO IF YOU SMELL GAS

• Do not try to light any appliance.

• Do not touch any electric switch; do not
use any phone in your building.

• Immediately call your gas supplier
from a neighborʼs phone. Follow the
gas supplierʼs instructions.

• If you cannot reach your gas supplier,
call the fire department.

REMOTE-READY MODELS

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.

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 21.

2. Depress control kno b 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 8 and 9
under

Lighting Instructions, page 21.

C. Use only your hand to push in or turn the

gas control knob. Never use tools. If the
knob will not push in or turn by hand, donʼt
try to repair it, call a qualified service tech

­nician or gas supplier. Force or attempted
repair may result in a fire or explosion.

D. Do not use this appliance if any part has

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

www.desatech.com

110021-01H 23

OPERATING HEATER

Continued

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 burner.
Note: AUTO is only functional when using
GWMT1 or GWMS2 optional accessories.

11. To light the front/rear burners, push in
and turn rear burner control knob coun

-

terclockwise

to the ON position.

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 automati

­cally with selector switch in the
ON position.

1. ST OP! Read the safety info rmation,
page 22.

2. Make sure equipment shutoff valve is fully
open.

3. Set switch in OFF position.

WARNING: Burner will come
on automatically within one
minute when the remote selec

­tor switch is in the ON position
after the pilot is lit.

4. Press in and turn control knobs clockwise
to the OFF position.

5. Wait five (5) minutes to clear out any gas.

Then smell for gas, including near the floor.
If you smell gas, STOP! Follow “B” in the
safety information on page 22. If you donʼt
smell gas, go to the next step.

6. Press in and turn control knob counter

-

clockwise

to the PILOT position.
Press in control knob for five (5) seconds
(see Figure 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 more. 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 20.

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.

O

F

F

P

I

L

O

T

AUTO

OF

F

ON

O

N

Figure 30 - Control Knobs and Ignitor

Button Locations (Shown as Supplied,

No Remote Control Operation)

Rear Burner
Control Knob

Selector
Switch

Ignitor Button

Control Knob

Figure 31 - Pilot

(Propane/LP)

Ignitor Electrode

Figure 32 - Pilot

(Natural)

Pilot Burner

Thermocouple

Thermocouple

www.desatech.com

110021-01H

24

OPERATING HEATER

Continued

TO TURN OFF GAS

TO APPLIANCE

Shutting Off Heater

1. Turn control knob clockwise

to the

OFF position.

2. Turn rear burner control knob clockwise

to the OFF position.
3a. Set selector switch in the OFF position.
3b. 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. Turn rear burner control knob clockwise

to the OFF position.

3. Use remote control manual OFF button.

4. Set selector switch in the OFF position.

MANUAL LIGHTING

PROCEDURE

1. Follow steps 1 through 6 under Lighting

Instructions, page 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 under

Lighting Instructions, page 23.

OPTIONAL HAND-HELD

REMOTE OPERATION

Note: All remote control accessories must be
purchased separately (see Accessories, page

41). 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 23.

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.

Figure 33 - Control Knobs, Selector

Switch and Ignitor Button Locations for

Hand-Held Remote Operation

O

F

F

P

I

L

O

T

AUTO

OF

F

ON

O

N

Rear Burner
Control Knob

Selector
Switch

Ignitor Button

Control Knob

ON/OFF SERIES (MODEL GHRCB)

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).

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 UNL OCK press both buttons together

on hand-held remote control until the light
stops flashing. The hand-held remote is now
unlocked.

Figure 34 - On/Off Hand-Held Remote

Control Unit (GHRCB)

Control Button
Turns Burners
On and Off

THERMOSTAT SERIES (MODEL
GHRCTB)

The hand-held remote can be operated using ei­ther the manual mode (MANU) or thermostatic
mode (AUTO) (see Figure 35, page 25). To select
Fahrenheit/Centigrade mode display, carefully
press the ˚C/˚F mode button with the end of a
paper clip or similar blunt object.

www.desatech.com

110021-01H 25

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 press

-

ing 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.

Figure 35 - Thermostat Hand-Held

Remote Control Unit (GHRCTB)

Turns Hand­Held Remote
On or Off and
Allows You to
Choose the
Manual Setting

Selects Auto
Setting

Increases
Room
Temperature in
AUTO Mode

Digital
Display
Shows
Temperature
and Settings

Turns
Burners On
or Off

Decreases
Room
Temperature
in AUTO
Mode

Locks System
to Prevent
Accidental
Ignition

OPERATING HEATER

Continued

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.

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.

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 pat

­tern. 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 Ap

-

pliance, page 21 [thermostatically-controlled

model] or page 24 [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.

Pilot
Burner

Thermocouple

Figure 36 - Correct

Pilot Flame Pattern

(Natural Gas Pilot

Shown)

Figure 37 - Incorrect

Pilot Flame Pattern

(Natural Gas Pilot

Shown)

Pilot
Burner

Thermocouple

www.desatech.com

110021-01H

26

CLEANING AND

MAINTENANCE

WARNING: Turn off heater

and let cool before cleaning.

CAUTION: You must keep
control areas, burner 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,
bedding material, pet hair, etc.

WARNING: Failure to keep
the primary air opening(s) of
the burner(s) clean may result in
sooting and property damage.

BURNER INJECTOR HOLDERS AND
PILOT AIR INLET HOLES

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
tubes 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 com

­pressed 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.

BURNER FLAME PATTERNS

Figure 38 shows correct front and/or middle burner
flame patterns. Figure 39 shows incorrect front
and/or middle burner flame patterns. The incorrect
burner flame patterns show yellow tipping at top
of blue flame.

WARNING: If yellow tipping
occurs, your heater could pro­duce increased levels of carbon
monoxide. If burner flame pat

­terns show yellow tipping, follow
instructions below. 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 and/or middle burner flame patterns are
incorrect, as shown in Figure 39

• turn heater off (see To Turn Off Gas to Appli

-

ance, page 21 [Thermostat-Controlled Models]

or page 24 [Remote-Ready Models])

• see Troubleshooting

, page 28

INSPECTING BURNERS

Continued

Figure 38 - Correct Burner Flame

Patterns

Figure 39 - Incorrect Burner Flame

Patterns

Yellow
Tipping At
Top of Blue
Flame

(CSG3924NT/PT, CSG3924NR/PR and

CSG3930NR/PR Models shown)

(CSG3924NT/PT, CSG3924NR/PR and

CSG3930NR/PR Models shown)

www.desatech.com

110021-01H 27

1. Shut off the unit, including the pilot. Allow
the unit to cool for at least thirty minutes.

2. Inspect burners, pilot and primary air inlet
holes on injector holder for dust and dirt (see
Figures 40 or 41).

3. Blow air through the ports/slots and holes in
the burners.

4. Check the injector holders located at the end
of the burner tubes 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 holders.

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 as

­sembly. There is a small pilot air inlet hole about
two inches from where the pilot flame comes out
of the pilot assembly (see Figure 42). With the unit
off, lightly blow air through the air inlet hole. The
access hole for propane/LP pilot is on the front of
the burner carriage as shown in Figure 42. The
access hole for natural pilot is behind the pilot
bracket on the top of burner carriage (see Figure

41). You may blow through a drinking straw if
compressed air is not available.

Figure 40 - Injector Holder On Outlet

Burner Tube - Rear Burner

Figure 41 - Injector Holder On Outlet

Burner Tubes - Front and Middle Burners

Injector
Holder

Primary Air
Inlet Holes

Ports/Slots

Injector
Holder

YELLOW FLAME

(CTB Models)

BLUE FLAME

(VRL and CSG Models)

Access
Hole in
Base

Primary
Air Inlet
Holes

Control Knob

Burner
Tube

Injector Holder

Primary Air
Inlet Holes

CLEANING AND

MAINTENANCE

Continued

Access Hole
for Cleaning
Propane/LP
Pilot

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).

Figure 42 - Cleaning Pilot Air Inlet Hole

(Your pilot may vary from pilots shown)

Pilot Air
Inlet Hole

Pilot
Assembly

Access Hole
for Cleaning
Natural Pilot

Pilot Bracket

www.desatech.com

110021-01H

28

TROUBLESHOOTING

WARNING: Turn off and unplug 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.

POSSIBLE CAUSE

1. Ignitor electrode not con­nected to ignitor cable

2. Ignitor cable pinched or wet

3. Piezo ignitor nut is loose

4. Broken ignitor cable

5. Bad piezo ignitor

6. Ignitor electrode broken

7. Ignitor electrode positioned
wrong

1. Gas supply turned off or equip

-

ment 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

OBSERVED PROBLEM

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

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

REMEDY

1. Reconnect ignitor cable

2. Free ignitor cable if pinched
by any metal or tubing. Keep
ignitor cable dry

3.

Tighten nut holding piezo ig­nitor to base panel of log set. Nut
is located behind base panel

4. Replace ignitor cable

5. Replace piezo ignitor

6. Replace pilot assembly

7. Replace pilot assembly

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 op

-

eration 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

www.desatech.com

110021-01H 29

TROUBLESHOOTING

Continued

OBSERVED PROBLEM

ODS/pilot lights but flame goes
out when control knob is re

-

leased

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

Delayed ignition of one or more
burners

Burner backfiring during com

-

bustion

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) Cl ean ODS/p i lot (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 pro

-

pane/LP gas company

2. Clean burner(s) (see Cleaning
and Maintenance, page 26) or
replace burner orifice(s)

3.

Contact qualified service person

4. Reconnect leads (see Wiring
Diagram, page 33)

5. Replace battery in transmitter
and receiver

1. Contact local natural or pro

-

pane/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

POSSIBLE CAUSE

1.

Control knob not fully pressed in

2. Control knob not pressed in
long enough

3. Safety interlock system has
been triggered (Termostat­Controlled Models only)

4. Equipment shutoff valve not
fully open

5. Pilot flame not touching ther

-

mocouple, which allows ther

­mocouple 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 con nection
loose at control valve

7. Thermocouple damaged

8. Control valve damaged

1. Inlet gas pressure is too low

2. Burner orifice(s) clogged

3. Mislocated crossover tube

4. Thermopile leads disconnected
or improperly connected (Re

-

mote-Ready Models Only)

5. Burners will not come on in
remote position (Re mote­Ready Models Only)

1. Manifold pressure is too low

2. Burner orifice(s) clogged

3. Mislocated crossover tube

1. Burner orifice is clogged or
damaged

2. Damaged burner

3. Gas regulator defective

www.desatech.com

110021-01H

30

TROUBLESHOOTING

Continued

OBSERVED PROBLEM

Yellow flame in front/middle
burner during burner combustion
(VRL and CSG models)
Yellow flame in front burner
during burner combustion (CTB
models)

Slight smoke or odor during initial
operation

Heater produces a whistling noise
when burners are lit

White powder residue forming
within burner box or on adjacent
walls or furniture

Moisture/condensation noticed
on windows

Remote does not function

Heater produces a clicking/tick

­ing noise just after burners are lit
or shut off

REMEDY

1. C heck bu r n e r(s) for d irt
and debris. If found, clean
burner(s) (see Cleaning and
Maintenance, page 26)

2. Replace gas regulator

1. Problem will stop after a few
hours of operation

1. Turn cont rol 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 page 8)

4. Clean burners (see Cleaning
and Maintenance, page 26)

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

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

1. Replace 9-volt batteries in re

-

ceiver and hand-held remote

1.

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

POSSIBLE CAUSE

1. Not enough air

2. Gas regulator defective

1. Residues from manufacturing
processes and logs curing

1. Turning control knob to HI
position when burners are
cold

2. Air in gas line

3. Air passageways on heater
blocked

4. Dirty or partially clogged
burner orifice(s)

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

1. Not enough combustion/ven

-

tilation air

1. Battery is not installed. Bat

-

tery power is low

1. Metal expanding while heating
or contracting while cooling

www.desatech.com

110021-01H 31

OBSERVED PROBLEM

Hea t er produc e s u nwante d
odors

Heater shuts off in use (ODS
operates)

Gas odor even when control knob
is in OFF position

Gas odor during combustion

Log set cycles to pilot, but room
temperature drops to a lower than
ideal level before log set comes
back on (Thermostat-Controlled
Models Only)

POSSIBLE CAUSE

1. Heater burning vapors from
paint, hair spray, glues, clean

-

ers, chemicals, new carpet,
etc. (See IMPORTANT state-
ment above)

2. Low fuel supply (propane/LP
only)

3. Gas le ak. Se e War ning

statement above

1. Not enough fresh air is avail

-

able

2. Low line pressure

3. O DS / pil ot is p a rt i al l y
clogged

1. Gas le ak. Se e War ning

statement above

2. Control valve defective

1. Foreign matter between con

-

trol valve and burner

2. Gas le ak. Se e War ning

statement above

1. Thermostat sensing bulb needs
to be repositioned

REMEDY

1.

Open window and ventilate
room. Stop using odor caus

­ing products while heater is
running

2. Refill supply tank (propane/LP
only)

3. Locate and correct all leaks
(see Checking Gas Connec-
tions, page 16)

1. Open window and/or door for
ventilation

2. Contact local natural or pro

-

pane/LP gas company

3. Clean ODS/pilot (see Cleaning
and Maintenance, page 26)

1. Locate and correct all leaks
(see Checking Gas Connec

-

tions, page 16)

2. Replace control valve

1. Take apart gas tubing and
remove foreign matter

2. Locate and correct all leaks (see
Checking Gas Connections,
page 16)

1. Reposition thermostat sensing
bulb (see Optional Positioning

of Thermostat Sensing Bulb

,

page 32)

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.

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.

www.desatech.com

110021-01H

32

OPTIONAL POSITIONING

OF THERMOSTAT

SENSING BULB

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 near the
gas valve assembly on the mounting bracket.
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 adhesive­backed mounting clip is available.

1. Locate the gas valve assembly and thermostat
sensing bulb (see Figure 43).

2. Gently pull thermostat sensing bulb free from
the retaining clamp.

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. De

­termine 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).

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, page 33). Slide
the thermostat sensing bulb into the clip.

IMPORTANT: Do not crimp capillary.

Figure 44 - Adhesive-backed Mounting Clip

Adhesive-backed
Mounting Clip

Figure 45 - Locating Thermostat Sensing

Bulb on Masonry Fireplace

Thermostat
Sensing Bulb

Thermostat
Sensing Bulb

Figure 46 - Locating Thermostat Sensing

Bulb on Factory-built Metal Fireplace

Adhesive-backed
Mounting Clip

Glass Doors

Figure 47 - Installing Thermostat Sensing

Bulb Behind Glass Doors

Thermostat
Sensing Bulb

Adhesive­backed
Mounting Clip

Figure 43 - Location of Gas Valve

Assembly and Thermostat Sensing Bulb

Gas Valve
Assembly

Thermostat
Sensing Bulb

Retaining
Clamp

www.desatech.com

110021-01H 33

Capillary

Thermostat
Sensing Bulb

Do Not Crimp
Capillary

Adhesive-backed
Mounting Clip

Figure 48 - Positioning the Thermostat

Sensing Bulb in the Vertical Position

with the Capillary at the Bottom

OPTIONAL POSITIONING

OF THERMOSTAT

SENSING BULB

Continued

O.D.S. PILOT

THERMOPILE

PILOT

THERMOCOUPLE

IGNITOR

VALVE

THERMOCOUPLE

CONNECTION

PILOT
OUT

TPTH TP TH

PIEZO

SWITCH

AUTO

OFF

ON

Ignitor Cable

Thermopile Wire

Thermocouple

Wire

Wire Harness

WIRING DIAGRAM

(REMOTE-READY MODELS ONLY)

Note: For proper operation of optional accessories, the wires from the switch to the control valve must
be connected exactly as shown:

A

U

T

O

O

F

F

ON

Thermopile

www.desatech.com

110021-01H

34

SPECIFICATIONS

24" Thermostat-Controlled 30" Thermostat-Controlled

Btu (Variable) 10,000/40,000 10,000/40,000 10,000/40,000 10,000/40,000

Type Gas Propane/LP Natural Propane/LP Natural

Ignition Piezo Piezo Piezo Piezo

Manifold Pressure 7.4" W.C. 3.0" W.C. 7.4" W.C. 3.0" W.C.

Inlet Gas Pressure (in. of water)
Maximum 14" 10.5" 14" 10.5"
Minimum* 11" 5" 11" 5"

Shipping Weight 30 lbs. 30 lbs. 34 lbs. 34 lbs.

Certified Standards Z21.11.2-2000 Z21.11.2-2000 Z21.11.2-2000 Z21.11.2-2000

* For purpose of input adjustment

24" Remote-Ready 30" Remote-Ready

Btu (Variable) 10,000/40,000 10,000/40,000 10,000/40,000 10,000/40,000

Type Gas Propane/LP Natural Propane/LP Natural

Ignition Piezo Piezo Piezo Piezo

Manifold Pressure 8.0" W.C. 3.0" W.C. 8.0" W.C. 3.0" W.C.

Inlet Gas Pressure (in. of water)
Maximum 14" 10.5" 14" 10.5"
Minimum* 11" 5" 11" 5"

Shipping Weight 30 lbs. 30 lbs. 34 lbs. 34 lbs.

Certified Standards Z21.11.2-2000 Z21.11.2-2000 Z21.11.2-2000 Z21.11.2-2000
Z21.60-1996 Z21.60-1996 Z21.60-1996 Z21.60-1996
CGA2.26-M96 CGA2.26-M96 CGA2.26-M96 CGA2.26-M96

* For purpose of input adjustment

www.desatech.com

110021-01H 35

ILLUSTRATED PARTS BREAKDOWN

LOGS

PART NUMBER
CSG3924NT

CSG3924PT
CSG3924NR
CSG3924PR
VRL24NT VRL30NT CTB3924NT
VRL24PT VRL30PT CTB3924PT
KEY VRL24NR VRL30NR CTB3924NR CSG3930NR
NO. VRL24PR VRL30PR CTB3924PR CSG3930PR DESCRIPTION QTY.

1 110020-01 110020-02 110020-03 110020-04 Log Set 1
2 110103-01 110103-01 110103-01 110103-01 Log Ember Bed 1
3 110105-01 110106-01 110107-01 111528-01 Log, Right Front 1
4 110105-02 110106-02 110107-02 111528-02 Log, Left Front 1
5 110105-03 110106-03 110107-03 111528-03 Log, Back 1
6 110105-04 110105-04 110107-04 111528-04 Log, Right Crossover 1
7 110104-01 110104-01 110104-01 110104-01 Log, Left Crossover 1

Log Set for Models:
VRL24NT, VRL24PT, VRL24NR,
VRL24PR, VRL30NT, VRL30PT,
VRL30NR, VRL30PR

Log Set for Models:
CSG3924NT, CSG3924PT, CSG3924NR,
CSG3924PR, CSG3930NR, CSG3930PR,
CTB3924NT, CTB3924PT,
CTB3924NR, and CTB3924PR

2

3

5

4

2

3

6

7

7

5

4

6

www.desatech.com

110021-01H

36

ILLUSTRATED PARTS BREAKDOWN

THERMOSTAT-CONTROLLED MODELS
VRL24NT, VRL24PT, VRL30NT, VRL30PT
CSG3924NT, CSG3924PT, CTB3924NT, CTB3924PT

1

16

17

2

18

12

28

24

27

27

27

27

27

27

8

8

7

9

13

5

6

19

20

4

14

10

25

3

26

22

15

21

11

23

www.desatech.com

110021-01H 37

PARTS LIST

THERMOSTAT-CONTROLLED MODELS

This list contains replaceable parts used in your heater. When ordering parts, follow the instructions
listed under Replacement Parts on page 40 of this manual.

PART NUMBER
KEY VRL24NT VRL24PT

NO. CSG3924NT CSG3924PT VRL30NT VRL30PT CTB3924NT CTB3924PT

DESCRIPTION

QTY

1

**

**

**

**

**

**

Burner Carriage 1

2 110328-01 110061-03 110328-01 110061-03 110328-01 110061-03

Tube, Front and Rear Burner

1

3 110061-02 110061-02 110061-02 110061-02 110061-02 110061-02 Tube, Middle Burner T-Stat 1

4 111124-01 111124-01 111124-01 111124-01 111124-01 111124-01 Retainer Spring 1

5 110063-02 110063-02 110063-02 110063-02

____ ____

Burner, Front Blue Flame 1

____ ____ ____ ____

110063-03 110063-03 Burner, Front Yellow Flame 1

6 110063-01 110063-01 110063-01 110063-01 110063-01 110063-01 Burner, Middle Blue Flame 1

7 108105-01 108105-01 108105-01 108105-01 108105-01 108105-01 Burner, Rear 1

8 107110-01 107110-01 107110-01 107110-01 107110-01 107110-01 Spacer 2

9 107485-01 104286-01 107485-01 104286-01 107485-01 104286-01 ODS Pilot 1

10 102394-02 102394-02 102394-02 102394-02 102394-02 102394-02 Control Bracket (T-Stat) 1

11 099387-09 099387-09 099387-09 099387-09 099387-09 099387-09 Pilot Tube 1

12 108628-01 108628-01 108628-01 108628-01 108628-01 108628-01 Inlet Tube 1

13 110093-04 110093-04 110093-04 110093-04 110093-04 110093-04 Pilot Mounting Bracket 1

14 097159-04 097159-04 097159-04 097159-04 097159-04 097159-04 Piezo Ignitor 1

15 098271-10 098271-10 098271-10 098271-10 098271-10 098271-10 Ignitor Cable 1

16 099056-18 099056-21 099056-18 099056-21 099056-18 099056-21

Burner Orifice Injector, Back

1

17 101004-02 101004-18 101004-02 101004-18 101004-02 101004-18

Burner Orifice Injector, Front

1

18 101004-11 101004-13 101004-11 101004-13 101004-11 101004-13

Burner Orifice Injector, Middle

1

19 108692-02 108692-02 108692-02 108692-02 108692-02 108692-02 T-Stat Cover Plate 1

20 108692-03 108692-03 108692-03 108692-03 108692-03 108692-03 Remote Cover Plate 1

21 102030-01 102030-01 102030-01 102030-01 102030-01 102030-01 Thermobulb Clip 2

22 098867-16 098867-16

___

098867-16

___

098867-16

Gas Regulator (Propane/LP)

1

___ ___

098867-15

___

098867-15

___

Gas Regulator (Natural) 1

23 098522-25 098522-10 098522-25 098522-10 098522-25 098522-10 Thermostatic Gas Valve Kit 1

24 108106-01 108106-01 108106-01 108106-01 108106-01 108106-01 Manual Control Valve 1

25 099393-03 099393-03 099393-03 099393-03 099393-03 099393-03 Control Knob 1

26 098508-01 098508-01 098508-01 098508-01 098508-01 098508-01 Valve Retainer Nut 1

27 108631-01 108631-01 108631-01 108631-01 108631-01 108631-01 Log Alignment Screw 8

28 108111-01 108111-01 108111-01 108111-01 108111-01 108111-01 Cast Iron Grate 1

PARTS AVAILABLE — NOT SHOWN

100563-01 100563-01 100563-01 100563-01 100563-01 100563-01 Warning Plate 1

101054-05 101054-05 101054-05 101054-05 101054-05 101054-05 Lighting Instructions Plate 1

100639-03 100639-03 100639-03 100639-03 100639-03 100639-03 Caution Decal 1

GA6060 GA6060 GA6060 GA6060 GA6060 GA6060 Lava Rock 1

** Not a field replaceable part

www.desatech.com

110021-01H

38

ILLUSTRATED PARTS BREAKDOWN

REMOTE-READY MODELS
VRL24NR, VRL24PR, VRL30NR, VRL30PR

CSG3924NR, CSG3924PR, CTB3924NR, CTB3924PR
CSG3930NR, CSG3930PR

O

F

F

P

I

L

O

T

O

N

1

16

2

18

11

22

Items 12 & 22
Natural Gas
Models Only

12

20

28

24

32

32

32

32

32

32

7

27

21

30

19

31

29

5

6

4

14

23

25

3

10

26

21

15

17

9

13

8

8

www.desatech.com

110021-01H 39

PARTS LIST

REMOTE-READY MODELS

This list contains replaceable parts used in your heater. When ordering parts, follow the instructions
listed under Replacement Parts on page 40 of this manual.

PART NUMBER
KEY VRL24NR VRL24PR CSG3930NR CSG3930PR

NO. CSG3924NR VRL30NR CSG3924PR VRL30PR CTB3924NR CTB3924PR

DESCRIPTION

QTY

1

**

**

**

** **

**

Burner Carriage 1
2 110328-01 110328-01 110061-03 110061-03 110328-01 110061-03 Tube, Front and Rear Burner 1
3 110061-01 110061-01 110061-01 110061-01 110061-01 110061-01 Tube, Middle Burner Remote 1
4 111124-01 111124-01 111124-01 111124-01 111124-01 111124-01 Retainer Spring 1
5 110063-02 110063-02 110063-02 110063-02 ____ ____ Burner, Front Blue Flame 1
____ ____ ____ ____ 110063-03 110063-03 Burner, Front Yellow Flame 1
6 110063-01 110063-01 110063-01 110063-01 110063-01 110063-01 Burner, Middle Blue Flame 1
7 108105-01 108105-01 108105-01 108105-01 108105-01 108105-01 Burner, Rear 1
8 107110-01 107110-01 107110-01 107110-01 107110-01 107110-01 Spacer 2
9 103779-01 103779-01 103778-01 103778-01 103779-01 103778-01 ODS Pilot 1
10 108135-01 108135-01 108135-01 108135-01 108135-01 108135-01 Valve Bracket 1
11 099387-14 099387-14 099387-09 099387-09 099387-14 099387-09 Pilot Tube 1
12 099387-15 099387-15 ____ ____ 099387-15 ____ Pilot Regulator Tube, NG 1
13 110093-04 110093-04 110093-04 110093-04 110093-04 110093-04 Pilot Mounting Bracket 1
14 097159-04 097159-04 097159-04 097159-04 097159-04 097159-04 Piezo Ignitor 1
15 098271-10 098271-10 098271-10 098271-10 098271-10 098271-10 Ignitor Cable 1
16 099056-18 099056-18 099056-21 099056-21 099056-18 099056-21 Burner Orifice Injector Back 1
17 101004-02 101004-02 101004-18 101004-18 101004-02 101004-18 Burner Orifice Injector Front 1
18 101004-11 101004-11 101004-13 101004-13 101004-11 101004-13 Burner Orifice Injector Middle 1
19 108692-04 108692-04 108692-04 108692-04 108692-04 108692-04 Remote Cover Plate 1
20 098265-02 098265-02 098265-02 098265-02 098265-02 098265-02 Male Elbow 1
21 M12461-26 M12461-26 M12461-26 M12461-26 M12461-26 M12461-26

Screw, Hex Slt Wsr 10-32 x .38

4
22 099918-02 099918-02 ____ ____ 099918-02 ____ Pilot Regulator, NG 1
23 103781-03 103781-03 103781-04 103781-04 103781-03 103781-04 Gas Control Valve 1
24 108106-01 108106-01 108106-01 108106-01 108106-01 108106-01 Manual Control Valve 1
25 099393-03 099393-03 099393-03 099393-03 099393-03 099393-03 Control Knob 1
26 098508-01 098508-01 098508-01 098508-01 098508-01 098508-01 Valve Retainer Nut 1
27 103284-03 103284-03 103284-03 103284-03 103284-03 103284-03 Wire Harness 1
28 108111-01 108111-01 108111-01 108111-01 108111-01 108111-01 Cast Iron Grate 1
29 103587-02 103587-02 103587-02 103587-02 103587-02 103587-02 Plate, Switch 1
30 099998-01 099998-01 099998-01 099998-01 099998-01 099998-01 Fan Switch 1
31 103784-01 103784-01 103784-01 103784-01 103784-01 103784-01 On-Off-Pilot Knob Extension 1
32 108631-01 108631-01 108631-01 108631-01 108631-01 108631-01 Log Alignment Screw 8

PARTS AVAILABLE — NOT SHOWN

100563-01 100563-01 100563-01 100563-01 100563-01 100563-01 Warning Plate 1
103877-04 103877-04 103877-04 103877-04 103877-04 103877-04 Lighting Instructions Plate 1
100639-03 100639-03 100639-03 100639-03 100639-03 100639-03 Caution Decal 1
GA6060 GA6060 GA6060 GA6060 GA6060 GA6060 Lava Rock 1

** Not a field replaceable part

www.desatech.com

110021-01H

40

REPLACEMENT PARTS

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 canʼt supply original replacement part(s),
call DESA Heating Productsʼ 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.

PARTS NOT UNDER WARRANTY

Contact authorized dealers of this product. If they
canʼt 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

TECHNICAL SERVICE

You may have further questions about installation,
operation or troubleshooting. If so, contact DESA
Heating Productsʼ 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 Productsʼ techni

-

cal service web site at www.desatech.com.

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, con

-

tact your local natural or propane/LP gas supplier.

www.desatech.com

110021-01H 41

ACCESSORIES

NOTICE: All accessories may
not be available for all fireplace
models.

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.

EQUIPMENT SHUTOFF VALVE
GA5010

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

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.

CLEANING KIT - CCK/GCK

(Not Shown)

For all models. Your vent-free gas appliance re

­quires 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

(Not Shown)

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

[e-mail].

RECEIVER AND HAND-HELD
THERMOSTAT REMOTE CONTROL
KIT - GHRCTB AND CGHRCTB

For all Remote-Ready Models. Allows the gas
log heater to be operated in a manually or thermo

­statically controlled mode. You can turn the gas log
heater on and off without ever leaving the comfort
of your easy chair.

RECEIVER AND HAND-HELD
REMOTE CONTROL KIT - GHRCB
AND CGHRCB

For all Remote-Ready Models. Allows the gas
log heater to be turned on and off by using a hand­held remote control.

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.

DAMPER CLAMP - GA6080

(Not Shown)

For Remote-Ready Models. Permanently opens
chimney flue damper for vented operation.

LAVA ROCK - GA6060 (Not Shown)

For all models. Order when additional rock is
desired. (3 lb. bag)

FIRE CRACKLE - CF6-A

(Not Shown)

Creates the sound of a real burning fire.

www.desatech.com

110021-01H

42

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NOTES

www.desatech.com

110021-01H 43

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NOTES

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

www.desatech.com

110021-01
Rev. H
09/04

NOT A UPC

110021 01