Desa 10542 Original instructions

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 qualified

installer, service agency, or the gas supplier.

MANUAL 10,000 BTU - 10542 AND 10543

THERMOSTAT 10,000 BTU - 10544 AND 10545

THERMOSTAT 20,000 BTU - 10546 AND 10547

THERMOSTAT 30,000 BTU - 10548 AND 10549

UNVENTED (VENT-FREE) BLUE FLAME GAS HEATER

SAFETY INFORMATION AND INSTALLATION MANUAL

www.desatech.com 113680-01A

WARNING: Improper installation, adjustment, altera-

tion, service, or maintenance can cause injury or prop-

erty damage. Refer to this manual for correct installation

and operational procedures. For assistance or addi-

tional information consult a qualified installer, service

agency, or the gas supplier.

WARNING: This is an unvented gas-fired heater. It uses

air (oxygen) from the room in which it is installed.

Provisions for adequate combustion and ventilation air

must be provided. Refer to Air for Combustion and

Ventilation section on page 5 of this manual.

This appliance may be installed in an aftermarket,*

permanently located, manufactured (mobile) home,

where not prohibited by local codes.

This appliance is only for use with the type of gas

indicated on the rating plate. This appliance is not

convertible for use with other gases.

* Aftermarket: Completion of sale, not for purpose of resale, from the

manufacturer

TABLE OF CONTENTS

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

Local Codes ........................................................ 4

Product Identification .......................................... 4

Unpacking ........................................................... 4

Product Features ................................................ 4

Air For Combustion And Ventilation .................... 5

Installation ........................................................... 7

Operating Heater .............................................. 15

Inpecting Heater ................................................ 18

Cleaning and Maintenance ............................... 19

Troubleshooting ................................................ 20

Specifications .................................................... 24

Service Hints ..................................................... 25

Technical Service .............................................. 25

Service Publications .......................................... 25

Replacement Parts ........................................... 25

Illustrated Parts Breakdown and Parts List ....... 26

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

Parts Centrals ................................................... 31

Warranty Information .......................... Back Cover

www.desatech.com

113680-01A 3

SAFETY INFORMATION

IMPORTANT: Read this owner’s

manual carefully and completely

before trying to assemble, oper-

ate, or service this heater. Im-

proper use of this heater can

cause serious injury or death

from burns, fire, explosion, elec-

trical shock, and carbon mon-

oxide poisoning.

DANGER: Carbon monoxide

poisoning may lead to death!

Carbon Monoxide Poisoning: Early signs of car-

bon monoxide poisoning resemble the flu, with

headaches, dizziness, or nausea. If you have these

signs, the heater may not be working properly. Get

fresh air at once! Have heater serviced. Some

people are more affected by carbon monoxide than

others. These 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 pro-

pane/LP gases are fuel gases. Fuel gases are odor-

less.An odor-making agent are added to fuel gases.

The odor helps you detect a fuel gas leak. How-

ever, the odor added to fuel gas can fade. Fuel gas

may be present even though no odor exists.

Make certain you read and understand all warn-

ings. Keep this manual for reference. It is your

guide to safe and proper operation of this heater.

WARNING: Any change to

this heater or its controls can be

dangerous.

WARNING: Do not use a

blower insert, heat exchanger

insert or other accessory not

approved for use with this heater.

Due to high temperatures, the

appliance should be located out

of traffic and away from furni-

ture and draperies.

Do not place clothing or other

flammable material on or near

the appliance. Never place any

objects on the heater.

Surface of heater becomes very

hot when running heater. Keep

children and adults away from

hot surface to avoid burns or

clothing ignition. Heater will re-

main hot for a time after shut-

down. Allow surface to cool be-

fore touching.

Carefully supervise young chil-

dren when they are in the same

room with heater.

Make sure grill guard is in place

before running heater.

Keep the appliance area clear

and free from combustible ma-

terials, 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 appli-

ance 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.

3. This heater shall not be installed in a bath-

room. 20,000 and 30,000 Btu/Hr heater mod-

els shall not be installed in a bedroom.

4. 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

5. This heater needs fresh, outside air ventila-

tion to run properly. This heater has an Oxy-

gen Depletion Sensing (ODS) safety shutoff

system. The ODS shuts down the heater if not

enough fresh air is available. See Air for Com-

bustion and Ventilation, page 5.

www.desatech.com 113680-01A

6. Keep all air openings in front and bottom of

heater clear and free of debris. This will in-

sure enough air for proper combustion.

7. If heater shuts off, do not relight until you pro-

vide fresh, outside air. If heater keeps shut-

ting off, have it serviced.

8. Do not run heater

• where flammable liquids or vapors are used

or stored

• under dusty conditions

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. Do not use heater if any part has been 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.

11. Turn off and let cool before servicing. Only a

qualified service person should service and

repair heater.

12. Operating heater above elevations of 4,500

feet could cause pilot outage.

13. To prevent performance problems, do not use

propane/LP fuel tank of less than 100 lbs.

capacity.

14. Provide adequate clearances around air

openings.

LOCAL CODES

Install and use heater with care. Follow all local

codes. In the absence of local codes, use the latest

edition of National Fuel Gas Code, ANSI Z223.1/

NFPA 54*.

*Available from:

American National Standards Institute, Inc.

1430 Broadway

New York, NY 10018

National Fire Protection Association, Inc.

Batterymarch Park

Quincy, MA 02269

SAFETY INFORMATION

Continued

UNPACKING

1. Remove heater from carton.

2. Remove all protective packaging applied to

heater for shipment.

3. Check heater for any shipping damage. If

heater is damaged, promptly inform dealer

where you bought heater.

PRODUCT FEATURES

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 heat-

ers. 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.

THERMOSTATIC HEAT CONTROL

Thermostat models have a thermostat sensing bulb

and a control valve. This results in the greatest

heater comfort. This can also result in lower gas

bills.

PRODUCT

IDENTIFICATION

Figure 1 - Vent-Free Gas Heater

Ignitor Button

Control Knob

Heater

Cabinet

Front

Panel

Glass

Panel

Grill Guard

www.desatech.com

113680-01A 5

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 in-

sure proper fresh air for this

and other fuel-burning appli-

ances in your home.

Today’s homes are built more energy efficient than

ever. New materials, increased insulation, and new

construction methods help reduce heat loss in

homes. Home owners weather strip and caulk

around windows and doors to keep the cold air out

and the warm air in. During heating months, home

owners want their homes as airtight as possible.

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 5 through 7 will help you

classify your space and provide adequate ventilation.

Unusually Tight Construction

The air that leaks around doors and win-

dows may provide enough fresh air for

combustion and ventilation. However, in

buildings of unusually tight construction,

you must provide additional fresh air.

Unusually tight construction is defined as

construction where:

a. walls and ceilings exposed to the 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 ar-

eas such as joints around window and

door frames, between sole plates and

floors, between wall-ceiling joints, be-

tween wall panels, at penetrations for

plumbing, electrical, and gas lines, and

at other openings.

If your home meets all of the three criteria

above, you must provide additional fresh

air. See

Ventilation Air From Outdoors

page 7.

If your home does not meet all of the three

criteria above, proceed to

Determining

Fresh-Air Flow For Heater Location

, page 6.

Confined and Unconfined Space

The National Fuel Gas Code, ANSI Z223.1/NFPA

54 defines a confined space as a space whose vol-

ume is less than 50 cubic feet per 1,000 Btu per

hour (4.8 m3per kw) of the aggregate input rating

of all appliances installed in that space and an un-

confined space as a space whose volume is not

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

m3per kw) of the aggregate input rating of all ap-

pliances installed in that space. Rooms communi-

cating directly with the space in which the appli-

ances are installed*, through openings not fur-

nished with doors, are considered a part of the

unconfined space.

*Adjoining rooms are communicating only if there

are doorless passageways or ventilation grills be-

tween them.

www.desatech.com 113680-01A

AIR FOR COMBUSTION

AND VENTILATION

Continued

DETERMINING FRESH-AIR FLOW

FOR HEATER LOCATION

Determining if You Have a Confined or

Unconfined Space

Use this work sheet to determine if you have a con-

fined or unconfined space.

Space: Includes the room in which you will install

heater plus any adjoining rooms with doorless pas-

sageways or ventilation grills between the rooms.

1. Determine the volume of the space (length x

width x height).

Length x Width x Height =__________cu. ft.

(volume of space)

Example: Space size 20 ft. (length) x 16 ft.

(width) x 8 ft. (ceiling height) = 2560 cu. ft. (vol-

ume of space)

If additional ventilation to adjoining room is sup-

plied with grills or openings, add the volume of

these rooms to the total volume of the space.

2. Multiply the space volume by 20 to determine

the maximum Btu/Hr the space can support.

_______ (volume of space) x 20 = (Maximum

Btu/Hr the space can support)

Example:

2560 cu. ft. (volume of space) x 20 =

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

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

the space.

Vent-free heater ______________ 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 heater + _____________ Btu/Hr

Total = _____________ Btu/Hr

40,000

20,000

60,000

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)

60,000 Btu/Hr (actual amount of Btu/Hr used)

The space in the above example is a confined space

because the actual Btu/Hr used is more than the maxi-

mum Btu/Hr the space can support. You must pro-

vide additional fresh air. Your options are as follows:

A. Rework worksheet, adding the space of an ad-

joining room. If the extra space provides an un-

confined space, remove door to adjoining room

or add ventilation grills between rooms. See Ven-

tilation Air From Inside Building, page 7.

B. Vent room directly to the outdoors. See Ventila-

tion Air From Outdoors, page 7.

C. Install a lower Btu/Hr heater, if lower Btu/Hr size

makes room unconfined.

If the actual Btu/Hr used is less than the maximum Btu/

Hr the space can support, the space is an unconfined

space. You will need no additional fresh air ventilation.

WARNING: If the area in

which the heater may be 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

www.desatech.com

113680-01A 7

Figure 3 - Ventilation Air from Outdoors

VENTILATION AIR

Ventilation Air From Inside Building

This fresh air would come from an adjoining un-

confined space. When ventilating to an adjoining

unconfined space, you must provide two perma-

nent openings: one within 12" of the ceiling and

one within 12" of the floor on the wall connecting

the two spaces (see options 1 and 2, Figure 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 open-

ings: one within 12" of the ceiling and one within

12" of the floor. Connect these items directly to

the outdoors or spaces open to the outdoors. These

spaces include attics and crawl spaces. Follow the

National Fuel Gas Code, ANSI Z223.1/NFPA 54,

Section 5.3, Air for Combustion and Ventilation

for required size of ventilation grills or ducts.

IMPORTANT:

Do not provide openings for inlet

or outlet air into attic if attic has a thermostat-con-

trolled power vent. Heated air entering the attic

will activate the power vent.

Figure 2 - Ventilation Air from Inside

Building

Remove

Door into

Adjoining

Room,

Option 3

Ventilation Grills

Into Adjoining Room,

Option 2

12"

Ventilation

Grills

into Adjoining

Room,

Option 1

Outlet

Air

Ventilated

Attic

Outlet

Inlet

Air

Inlet Air Ventilated

Crawl Space

Crawl

Space

To Attic

AIR FOR COMBUSTION

AND VENTILATION

Continued

INSTALLATION

NOTICE: This heater is intended

for use as supplemental heat.

Use this heater along with your

primary heating system. Do not

install this heater as your pri-

mary heat source. If you have a

central heating system, you may

run system’s circulating blower

while using heater. This will help

circulate the heat throughout the

house. In the event of a power

outage, you can use this heater

as your primary heat source.

WARNING: A qualified ser-

vice person must install heater.

Follow all local codes.

CHECK GAS TYPE

Use only the correct type of gas (natural or pro-

pane/LP). If your gas supply is not the correct gas

type, do not install heater. Call dealer where you

bought heater for proper type heater.

WARNING: This appliance

is equipped for (natural or pro-

pane/LP) gas. Field conversion

is not permitted.

www.desatech.com 113680-01A

INSTALLATION ITEMS

Before installing heater, make sure you have the

items listed below.

• for propane/LP gas, external regulator (supplied

by installer)

• piping (check local codes)

• sealant (resistant to propane/LP gas)

• equipment shutoff valve *

• ground joint union

• sediment trap

• tee joint

• pipe wrench

• for natural gas, test gauge connection*

* A CSAdesign-certified equipment shutoff valve

with 1/8" NPT tap is an acceptable alternative to

test gauge connection. The optional CSA design-

certified equipment shutoff valve can be purchased

from your dealer. See Accessories, page 30.

LOCATING HEATER

This heater is designed to be mounted on a wall.

WARNING: Maintain the

minimum clearances shown in

Figure 4. If you can, provide

greater clearances from floor,

ceiling, and joining wall.

You can locate heater on floor, away from a wall.

An optional floor mounting stand is needed. Pur-

chase the floor mounting stand from your dealer.

See Accessories, page 30.

WARNING: Never install the

heater

• in a bathroom

• 20,000 or 30,000 Btu in a bed-

room

• in a recreational vehicle

• where curtains, furniture,

clothing, or other flammable

objects are less than 36 inches

from the front, top, or sides of

the heater

• as a fireplace insert

• in high traffic areas

• in windy or drafty areas

Figure 4 - Mounting Clearances As

Viewed From Front of Heater

INSTALLATION

Continued

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 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 5. If high humid-

ity is experienced, a dehumidifier may be used to

help lower the water vapor content in the air.

CAUTION: If you install the

heater in a home garage

• heater pilot and burner must

be at least 18 inches above

floor

• locate heater where moving

vehicle will not hit it

For convenience and efficiency, install heater

• where there is easy access for operation, inspec-

tion, and service

• in coldest part of room

An optional fan kit is available from your dealer.

See Accessories, page 30. If planning to use fan,

locate heater near an electrical outlet.

Minimum

From

Sides Of

Heater

36"

FLOOR

CEILING

Minimum

Minimum To

Top Surface

Of Carpeting

Tile Or Other

Combustible

Material

Left

Side

Right

Side

www.desatech.com

113680-01A 9

INSTALLATION

Continued

THERMOSTAT SENSING BULB

(Thermostat Models Only)

The thermostat sensing bulb has been placed be-

low the heater.

1. Place clamp on thermostat sensing bulb as

shown in Figure 5. Clamp is provided in hard-

ware package.

2. Snap clamp into upper mounting hole as shown

in Figure 5. Mounting hole is located on lower

left edge on back of heater. Make sure the ther-

mostat sensing bulb is pointing up.

Figure 5 - Attaching Thermostat Sensing

Bulb

INSTALLING HEATER TO WALL

Mounting Bracket

Locate mounting bracket in heater carton. Remove

mounting bracket from heater carton.

Figure 7 - Removing Front Panel Of

Heater

Clamp

Thermostat

Sensing Bulb

Figure 6 - Mounting Bracket

Removing Front Panel Of Heater

1. Remove the two screws, one on each side of

front panel.

2. Pull bottom of front panel up and forward, then

out.

3. Remove any remaining packaging materials.

Methods For Attaching Mounting

Bracket To Wall

Only use last hole on each end of mounting bracket

to attach bracket to wall. These two holes centers are

13 inches apart for the 20,000 and 30,000 Btu/Hr

units and 9 inches apart for the 10,000 Bru/Hr units.

Attach mounting bracket to wall in one of two ways:

1. Attaching to wall stud

2. Attaching to wall anchor

Attaching to Wall Stud: This method provides the

strongest hold. Insert mounting screws through

mounting bracket and into wall studs.

Attaching toWall Anchor: This method allows you

to attach mounting bracket to hollow walls (wall

areas between studs) or to solid walls (concrete or

masonry).

Decide which method better suits your needs. Ei-

ther method will provide a secure hold for the

mounting bracket.

Marking Screw Locations

1. Tape mounting bracket to wall where heater

will be located. Make sure mounting bracket

is level.

WARNING: Maintain mini-

mum clearances shown in Fig-

ure 8, page 10. If you can, provide

greater clearances from floor

and joining wall.

www.desatech.com 113680-01A

Min.

13"

Min.

Adjoining Wall

13"

Adjoining Wall

Only Insert Mounting

Screws Through Last

Hole On Each End

Only Insert Mounting

Screws Through Last

Hole On Each End

Floor

Min.

Adjoining Wall

Only Insert Mounting

Screws Through Last

Hole On Each End

Floor

INSTALLATION

Continued

30,000 Btu/Hr Model

20,000 Btu/Hr Model

Figure 8 - Mounting Bracket Clearances

Attaching Mounting Bracket To Wall

Note:

Wall anchors, mounting screws, and spac-

ers are in hardware package. The hardware pack-

age is provided with heater.

Attaching To Wall Stud Method

For attaching mounting bracket to wall studs

1. Drill holes at marked locations using 9/64"

drill bit.

2. Place mounting bracket onto wall. Line up last

hole on each end of bracket with holes drilled

in wall.

3. Insert mounting screws through bracket and

into wall studs.

4. Tighten screws until mounting bracket is

firmly fastened to wall studs.

Attaching To Wall Anchor Method

For attaching mounting bracket to hollow walls

(wall areas between studs) or solid walls (concrete

or masonry)

1. Drill holes at marked locations using 5/16"

drill bit. For solid walls (concrete or masonry),

drill at least 1" deep.

2. Fold wall anchor as shown in Figure 9.

3. Insert wall anchor (wings first) into hole. Tap

anchor flush to wall.

4. For thin walls (1/2" or less), insert red key

into wall anchor. Push red key to “pop” open

anchor wings.

IMPORTANT:

Do not hammer key!

For thick walls (over 1/2" thick) or solid walls,

do not pop open wings.

5. Place mounting bracket onto wall. Line up last

hole on each end of bracket with wall anchors.

6. Insert mounting screws through bracket and

into wall anchors.

7. Tighten screws until mounting bracket is

firmly fastened to wall.

Figure 9 - Folding

Anchor

Figure 10 - Popping

Open Anchor Wings

For Thin Walls

2. Mark screw locations on wall (see Figure 8).

Note:

Only mark last hole on each end of

mounting bracket. Insert mounting screws

through these holes only.

3. Remove tape and mounting bracket from wall.

10,000 Btu/Hr Model

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