Desa CSG3924NTA Quick start guide

For more information, visit www.desatech.com

WARNING: If the information in this manual is not

followed exactly, a re or explosion may result causing

property damage, personal injury or loss of life.

— Do not store or use gasoline or other ammable

vapors and liquids in the vicinity of this or any other

appliance.

— WHAT TO DO IF YOU SMELL GAS

• Do not try to light any appliance.

• Do not touch any electrical switch; do not use any

phone in your building.

• Immediately call your gas supplier from a neighbor’s

phone. Follow the gas supplier’s instructions.

• If you cannot reach your gas supplier, call the re

department.

— Installation and service must be performed by a quali-

ed installer, service agency or the gas supplier.

INSTALLER: Leave this manual with the appliance.

CONSUMER: Retain this manual for future reference.

UNVENTED (VENT-FREE) GAS LOG HEATER

OWNER’S OPERATION AND INSTALLATION MANUAL

24" THERMOSTAT MODELS

CSG3924NTA AND CSG3924PTA

www.desatech.com 123551-01D2

SAFETy

WARNING: Improper

installation, adjustment,

alteration, service or

maintenance can cause

injury or property dam-

age. Refer to this manual

for correct installation

and operational proce-

dures. For assistance or

additional information

consult a qualified in-

staller, service agency or

the gas supplier.

WARNING: This is an

unvented gas-red heat-

er. It uses air (oxygen)

from the room in which

it is installed. Provisions

for adequate combustion

and ventilation air must

be provided. Refer to Air

for Combustion and Ven-

tilation section on page 6

of this manual.

WARNING: This ap-

pliance is for installation

only in a solid-fuel burning

masonry or UL127 factory-

built replace or in a listed

ventless firebox enclo-

sure. It is design-certied

for these installations in

accordance with ANSI

Z21.11.2. Exception: Do

not install this appliance

in a factory-built replace

that includes instructions

stating it has not been test-

ed or should not be used

with unvented gas logs.

This appliance may be in-

stalled in an aftermarket,*

permanently located,

manufactured (mobile)

home, where not prohib-

ited by local codes.

This appliance is only for

use with the type of gas

indicated on the rating

plate. This appliance is

not convertible for use

with other gases.

* Aftermarket: Completion of sale, not for

purpose of resale, from the manufacturer

TABLE OF CONTENTS

Safety .................................................................. 2

Product Identication........................................... 5

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

Unpacking............................................................ 5

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

Air For Combustion and Ventilation ..................... 6

Installation ........................................................... 9

Operation........................................................... 18

Inspecting Burners............................................. 20

Cleaning and Maintenance................................ 20

Troubleshooting................................................. 22

Optional Positioning of Thermostat Sensing Bulb... 26

Specications .................................................... 27

Parts .................................................................. 27

Replacement Parts............................................ 30

Service Hints ..................................................... 30

Technical Service............................................... 30

Accessories ....................................................... 30

www.desatech.com

123551-01D 3

WARNING: This product con-

tains and/or generates chemicals

known to the State of California

to cause cancer or birth defects

or other reproductive harm.

IMPORTANT: Read this owner’s

manual carefully and completely

before trying to assemble, op-

erate or service this replace.

Improper use of this replace

can cause serious injury or

death from burns, re, explo-

sion, electrical shock and carbon

monoxide poisoning.

DANGER: Carbon monoxide

poisoning may lead to death!

Carbon Monoxide Poisoning: Early signs of

carbon monoxide poisoning resemble the u,

with headaches, dizziness or nausea. If you

have these signs, the replace may not be

working properly. Get fresh air at once! Have

replace serviced. Some people are more af-

fected by carbon monoxide than others. These

include pregnant women, people with heart or

lung disease or anemia, those under the inu-

ence 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 replace.

WARNING: Any change to

this heater or its controls can

be dangerous.

SAFETy

Continued

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-fu-

el burning replace or approved

ventless rebox enclosure.

WARNING: Do not allow fans

to blow directly into the replace.

Avoid any drafts that alter burner

ame patterns. Ceiling fans can

create drafts that alter burner

ame patterns. Altered burner

patterns can cause sooting.

Due to high temperatures, the

appliance should be located out

of trafc and away from furniture

and draperies.

Do not place clothing or other

ammable material on or near

the appliance. Never place any

objects on the heater.

Heater base assembly becomes

very hot when running heater.

Keep children and adults away

from hot surface to avoid burns

or clothing ignition. Heater

will remain hot for a time after

shutdown. Allow surface to cool

before touching.

Carefully supervise young chil-

dren when they are in the room

with heater.

www.desatech.com 123551-01D4

SAFETy

Continued

8. To prevent the creation of soot, follow the

instructions in Cleaning and Maintenance,

page 20.

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 ven-

tilation to run properly. This heater has an

Oxygen Depletion 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 22.

11. Do not run heater

• where ammable liquids or vapors are

used or stored

• under dusty conditions

12. Do not use this heater to cook food or burn

paper or other objects.

13. Do not use heater if any part has been ex-

posed to or under water. Immediately call

a qualied service technician to inspect

the room heater and to replace any part

of the control system and any gas control

which has been under water.

14. Do not operate heater if any log is broken.

Do not operate heater if a log is chipped

(dime-sized or larger).

15. Turn heater off and let cool before servic-

ing, installing or repairing. Only a qualied

service person should install, service or

repair heater.

16. Operating heater above elevations of

4,500 feet could cause pilot outage.

17. To prevent performance problems with

propane/LP models, do not use propane/

LP fuel tank of less than 100 lb. capacity.

18. Provide adequate clearances around air

openings.

You must operate this heater

with a replace screen in place.

Make sure replace screen is

closed before running heater.

Keep the appliance area clear

and free from combustible ma-

terials, gasoline and other am-

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)

inside any structure. Locate propane/LP

supply tank(s) outdoors (propane/LP units

only).

3. If you smell gas

• shut off gas supply

• do not try to light any appliance

• do not touch any electrical switch; do not

use any phone in your building

• immediately call your gas supplier from

a neighbor’s phone. Follow the gas sup-

plier’s instructions

• if you cannot reach your gas supplier,

call the re department

4. This heater shall not be installed in a

bedroom or bathroom.

5. Before installing in a solid fuel burning re-

place, the chimney ue and rebox must

be cleaned of soot, creosote, ashes and

loose paint by a qualied chimney cleaner.

Creosote will ignite if highly heated. A dirty

chimney ue may create and distribute

soot within the house. Inspect chimney

ue and rebox for damage. If damaged,

repair ue before operating heater.

6. Do not burn solid-fuel in a masonry or

UL127 factory-built replace in which a

vent-free room heater is installed.

7. If replace has glass doors, never operate

this heater with glass doors closed. If you

operate heater with doors closed, heat

buildup inside replace will cause glass to

burst. Make sure there are no obstructions

across openings of replace.

www.desatech.com

123551-01D 5

LOCAL CODES

PRODUCT IDENTIFICATION

Figure 1 - Product Identication

Log Set (Varies

According to Model)

Base

Assembly

Front and Rear

Burner Control Knob

Piezo

Ignitor

Burner

Control

Knob

Grate

Install and use heater with care. Follow all

local codes. In the absence of local codes,

use the latest edition of The National Fuel

Gas Code ANSI Z223/NFPA 54*.

*Available from:

American National Standards Institute, Inc.

1430 Broadway

New York, NY 10018

National Fire Protection Association, Inc.

Batterymarch Park

Quincy, MA 02269

State of Massachusetts: The installa-

tion must be made by a licensed plumber

or gas fitter in the Commonwealth of

Massachusetts.

Sellers of unvented propane or natural

gas-red supplemental room heaters shall

provide to each purchaser a copy of 527

CMR 30 upon sale of the unit.

Vent-free gas products are prohibited for

bedroom and bathroom installation in the

Commonwealth of Massachusetts.

UNPACkING

CAUTION: Do not remove the

data plates from the grate as-

sembly. The data plates contain

important warranty and safety

information.

1. Remove logs and heater base assembly

from carton.

Note: Do not pick up heater base as-

sembly by burners. This could damage

heater. Always handle base assembly by

the sides of assembly.

2. Remove all protective packaging applied

to logs and heater for shipment.

3. Check heater for any shipping damage. If

heater is damaged call DESA Heating, LLC

at 1-866-672-6040 for replacement parts

before returning to dealer.

www.desatech.com 123551-01D6

PRODUCT FEATURES

SAFETY DEVICE

This heater has a pilot with an Oxygen Deple-

tion Sensing (ODS) safety shutoff system. The

ODS/pilot is a required feature for vent-free

room heaters. The ODS/pilot shuts off the

heater if there is not enough fresh air.

PIEZO IGNITION SYSTEM

This heater has a piezo ignitor. This system re-

quires no matches, batteries or other sources

to light heater.

OPERATION

This heater is clean burning. It requires no

outside venting. There is no heat loss out a

vent or up a chimney. Heat is generated by

both realistic ames and glowing coals. This

heater is designed for vent-free operation

with ue damper closed. It has been tested

and approved to ANSI Z21.11.2 standard

for unvented heaters. State and local codes

in some areas prohibit the use of vent-free

heaters.

AIR FOR COMBUSTION AND VENTILATION

WARNING: This heater shall

not be installed in a room or

space unless the required vol-

ume of indoor combustion air

is provided by the method de-

scribed in the National Fuel Gas

Code, ANSI Z223.1/NFPA 54, the

International Fuel Gas Code, or

applicable local codes. Read the

following instructions to insure

proper fresh air for this and

other fuel-burning appliances

in your home.

Today’s homes are built more energy efcient

than ever. New materials, increased insulation

and new construction methods help reduce

heat loss in homes. Home owners weather

strip and caulk around windows and doors

to keep the cold air out and the warm air in.

During heating months, home owners want

their homes as airtight as possible.

While it is good to make your home energy

efcient, your home needs to breathe. Fresh

air must enter your home. All fuel-burning ap-

pliances need fresh air for proper combustion

and ventilation.

Exhaust fans, replaces, clothes dryers and

fuel burning appliances draw air from the

house to operate. You must provide adequate

fresh air for these appliances. This will in-

sure proper venting of vented fuel-burning

appliances.

PROVIDING ADEQUATE VENTILATION

The following are excerpts from National Fuel

Gas Code. ANSI Z223.1/NFPA 54, Air for

Combustion and Ventilation.

All spaces in homes fall into one of the three

following ventilation classications:

1. Unusually Tight Construction

2. Unconned Space

3. Conned Space

The information on pages 6 through 8 will help

you classify your space and provide adequate

ventilation.

Unusually Tight Construction

The air that leaks around doors and windows

may provide enough fresh air for combustion

and ventilation. However, in buildings of un-

usually tight construction, you must provide

additional fresh air.

Unusually tight construction is dened as

construction where:

a. walls and ceilings exposed to the out-

side atmosphere have a continuous

water vapor retarder with a rating of

one perm (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 oors, between wall-ceiling joints,

between wall panels, at penetrations

for plumbing, electrical and gas lines

and at other openings.

If your home meets all of the three criteria

above, you must provide additional fresh

air. See Ventilation Air From Outdoors,

page 8.

If your home does not meet all of the

three criteria above, proceed to Determin-

ing Fresh-Air Flow For Heater Location,

page 7.

www.desatech.com

123551-01D 7

AIR FOR COMBUSTION AND VENTILATION

Continued

40,000

31,500

71,500

Conned Space and Unconned Space

The National Fuel Gas Code ANSI Z223.1/

NFPA 54 denes a conned space as a space

whose volume is less than 50 cubic feet per

1,000 Btu/hr (4.8 m3per kw) of the aggregate

input rating of all appliances installed in that

space and an unconned space as a space

whose volume is not less than 50 cubic feet

per 1,000 Btu/hr (4.8 m3per kw) of the ag-

gregate 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 un-

conned 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 Conned or

Unconned Space

Use this work sheet to determine if you have

a conned or unconned space.

Space: Includes the room in which you will install

replace plus any adjoining rooms with door-

less 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 replace __________ Btu/Hr

Gas water heater* __________ Btu/Hr

Gas furnace __________ Btu/Hr

Vented gas heater __________ Btu/Hr

Gas replace logs __________ Btu/Hr

Other gas appliances*+ __________ Btu/Hr

Total = __________ Btu/Hr

* Do not include direct-vent gas appliances.

Direct-vent draws combustion air from the

outdoors and vents to the outdoors.

Example:

Gas water heater __________ Btu/Hr

Vent-free replace + __________ Btu/Hr

Total = __________ Btu/Hr

4. Compare the maximum Btu/Hr the space

can support with the actual amount of Btu/

Hr used.

______ Btu/Hr (maximum 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 conned space

because the actual Btu/Hr used is more than the

maximum Btu/Hr the space can support. You

must provide additional fresh air. Your options

are as follows:

A. Rework worksheet, adding the space of an

adjoining room. If the extra space provides

an unconned space, remove door to adjoin-

ing room or add ventilation grills between

rooms. See Ventilation Air From Inside

Building, page 8.

B. Vent room directly to the outdoors. See

Ventilation Air From Outdoors, page 8.

C. Install a lower Btu/Hr replace, if lower Btu/

Hr size makes room unconned.

If the actual Btu/Hr used is less than the maxi-

mum Btu/Hr the space can support, the space is

an unconned space. You will need no additional

fresh air ventilation.

www.desatech.com 123551-01D8

AIR FOR COMBUSTION AND VENTILATION

Continued

Figure 2 - Ventilation Air from Inside

Building

Figure 3 - Ventilation Air from Outdoors

Outlet

Air

V e ntilated

Attic

Outlet

Inlet

Air

Inlet Air V e ntilated

Crawl Space

T o

Crawl

Space

T o Attic

Remove

Door into

Adjoining

Room,

Option

Ve ntilation Grills

Into Adjoining Room,

Option 2

Ve ntilation

Grills Into

Adjoining

Room,

Option 1

12"

WARNING:Iftheareainwhich

the heater may be operated does

not meet the required volume for

indoor combustion air, combus-

tion and ventilation air shall be

provided by one of the methods

described in the National Fuel

Gas Code,ANSI Z223.1/NFPA54,

the International Fuel Gas Code,

or applicable local codes.

VENTILATION AIR

Ventilation Air From Inside Building

This fresh air would come from an adjoining

unconned space. When ventilating to an

adjoining unconned space, you must provide

two permanent openings: one within 12" of the

ceiling and one within 12" of the oor on the

wall connecting the two spaces (see options

1 and 2, Figure 2). You can also remove door

into adjoining room (see option 3, Figure 2).

Follow the National Fuel Gas Code ANSI

Z223.1/NFPA 54, 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 perma-

nent openings: one within 12" of the ceiling

and one within 12" of the oor. Connect these

items directly to the outdoors or spaces open

to the outdoors. These spaces include attics

and crawl spaces. Follow the National Fuel

Gas Code ANSI Z223.1/NFPA 54, 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 thermo-

stat-controlled power vent. Heated air entering

the attic will activate the power vent.

www.desatech.com

123551-01D 9

INSTALLATION

NOTICE: This heater is intended

for use as supplemental heat.

Use this heater along with your

primary heating system. Do not

install this heater as your pri-

mary heat source. If you have a

central heating system, you may

run system’s circulating blower

while using heater. This will help

circulate the heat throughout the

house. In the event of a power

outage, you can use this heater

as your primary heat source.

WARNING: Installation and

repair should be done by a

qualied service person. The

appliance should be inspected

before use and at least annu-

ally by a professional service

person. More frequent cleaning

may be required due to exces-

sive lint from carpeting, bedding

material, etc. It is imperative that

control compartments, burners

and circulating air passageways

of the appliance be kept clean.

WARNING: Before installing

in a solid fuel burning replace,

the chimney ue and rebox

must be cleaned of soot, creo-

sote, ashes and loose paint by

a qualified chimney cleaner.

Creosote will ignite if highly

heated. A dirty chimney ue may

create and distribute soot within

the house. Inspect chimney ue

and rebox for damage. If dam-

aged, repair ue before operat-

ing heater.

WARNING: Seal any fresh

air vents or ash clean-out doors

located on oor or wall of re-

place. If not, drafting may cause

pilot outage or sooting. Use a

heat-resistant sealant. Do not

seal chimney ue damper.

WARNING: Never install the

heater

• in a recreational vehicle

• where curtains, furniture, cloth-

ing or other ammable objects

are less than 36" from the front

and 42" from the top of rebox

opening. For side clearances

see Figure 4, page 10

• in high trafc areas

• in windy or drafty areas

CAUTION: This heater cre-

ates warm air currents. These

currents move heat to wall sur-

faces next to heater. Installing

heater next to vinyl or cloth wall

coverings or operating heater

where impurities (such as, but

not limited to, tobacco smoke,

aromatic candles, cleaning u-

ids, oil or kerosene lamps, etc.) in

the air exist, may discolor walls

or cause odors.

IMPORTANT:Vent-free heaters add moisture

to the air. Although this is benecial, installing

heater in rooms without enough ventilation

air may cause mildew to form from too much

moisture. See Air for Combustion and Ventila-

tion, page 6.

www.desatech.com 123551-01D10

Figure 4 - Minimum Clearance for

Combustible to Wall

*Minimum 16" from Side Wall

Example

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 replace opening. Noncombustible

materials (such as slate, marble, tile, etc.)

must be at least 1/2" thick. With sheet metal,

you must have noncombustible material be-

hind it. Noncombustible material must extend

at least 8" up. If noncombustible material is

less than 12", you must install the replace

hood accessory. See Figure 5, page 11, for

minimum clearances.

If Using Mantel

You must have noncombustible material(s)

above the replace opening. Noncombustible

materials (such as slate, marble, tile, etc.)

must be at least 1/2" thick. With sheet metal,

you must have noncombustible material be-

hind it. Noncombustible material must extend

at least 8" up. If noncombustible material is

less than 12", you must install the replace

hood accessory. 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.

INSTALLATION

Continued

Note: When installing your gas logs into

a manufactured rebox, follow rebox

manufacturer’s instructions for minimum

clearances to combustible materials.

B. Clearances from top of replace opening

to ceiling should not be less than 42".

CHECK GAS TYPE

Use only the correct gas type (natural or pro-

pane/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 either natural gas

or propane/LP gas but not both.

Gas type is indicated on the rat-

ing plate. Field conversion is not

permitted.

INSTALLATION AND CLEARANCES

(Vent-Free Operation Only)

WARNING: Maintain the

minimum clearances. If you

can, provide greater clearances

from oor, ceiling and adjoining

wall.

LOG SIZING REQUIREMENTS

Minimum Firebox Size

Log

Size Height Depth

Front

Width

Rear

Width*

24" 17" 14" 28" 20 1/4"

30" 17" 14" 34" 22 3/8"

*Measured at 14" Depth

Carefully follow the instructions below. This

will ensure safe installation into a masonry,

UL127-listed manufactured replace or certi-

ed vent-free rebox.

Minimum Clearances For Side

Combustible Material, Side Wall and

Ceiling

A. Clearances from the side of the replace

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 com-

bustible material must be 4" from the side

of the replace cabinet (see Figure 4).

This manual suits for next models

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