Desa NY108 Original instructions

MODELS
NY108 AND NY109
UNVENTED (VENT-FREE) BLUE FLAME GAS HEATER
SAFETY INFORMATION AND INSTALLATION MANUAL
Actual heater may
vary from illustration
For more information, visit www.desatech.com
WARNING: If the information in this manual is not fol-
lowed 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.
• Immediatelycallyourgassupplierfromaneighbor’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.
INSTALLER: Leave this manual with the appliance.
CONSUMER: Retain this manual for future reference.

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SAFETY INFORMATION
WARNING: Improper in-
stallation, adjustment, al-
teration,serviceormainte-
nance can cause injury or
property damage. Refer to
this manual for correct in-
stallation and operational
procedures. For assis-
tance or additional infor-
mation consult a qualified
installer,serviceagencyor
the gas supplier.
WARNING: This is an
unvented gas-fired 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 5
of this manual.
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.
This appliance may be in-
stalledinanaftermarket,*
permanently located,
manufactured (mobile)
home, where not prohib-
ited by local codes.
* Aftermarket: Completion of sale, not for
purpose of resale, from the manufacturer
WARNING: This product
contains and/or generates
chemicals known to the State
of California to cause cancer or
birth defects or other reproduc-
tive harm.
IMPORTANT: Read this owner’s
manualcarefullyandcompletely
before trying to assemble,
operate or service this heater.
Improper use of this heater can
cause serious injury or death
from burns, fire, explosion,
electrical shock and carbon
monoxide poisoning.
TABLE OF CONTENTS
Safety Information ............................................... 2
Local Codes......................................................... 4
Product Identification........................................... 4
Unpacking............................................................ 4
Product Features................................................. 4
Air For Combustion and Ventilation..................... 5
Installation ........................................................... 7
Operating Heater............................................... 15
Inspecting Heater .............................................. 17
Cleaning and Maintenance................................18
Troubleshooting................................................. 19
Specifications .................................................... 23
Service Hints ..................................................... 23
Replacement Parts............................................ 23
Technical Service............................................... 23
Service Publications.......................................... 23
Illustrated Parts Breakdown and Parts List........ 24
Wiring Diagrams................................................ 26
Accessories....................................................... 26
Parts Centrals.................................................... 27
Warranty Information...........................Back Cover

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119169-01E 3
DANGER:Carbonmonoxide
poisoning may lead to death!
Carbon MonoxidePoisoning: Earlysigns of car-
bonmonoxidepoisoning 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/LPgases are fuel gases. Fuel gases are
odorless. An odor-making agent is added to
fuel gases. The odor helps you detect a fuel
gas leak. However, 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
warnings. 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
insertorotheraccessorynotap-
proved for use with this heater.
Due to high temperatures, the
applianceshouldbelocatedout
oftrafficandawayfromfurniture
and draperies.
Do not place clothing or other
flammable material on or near
the appliance. Never place any
objects on the heater.
Surfaceofheater becomesvery
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 shut-
down. Allow surface to cool
before 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. Thisapplianceisonlyforusewiththetype
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.
3. This heater shall not be installed in a
bedroom or bathroom.
4. If you smell gas
• shut off gas supply
• do not try to light any appliance
• do not touchany electrical switch; donot
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-
tionto run properly.This heaterhasanOxy-
genDepletionSensing(ODS) safetyshutoff
system. The ODS shuts down the heater if
notenoughfreshair is available. See Air for
Combustion and Ventilation, page 5.
6. Keep all air openings in front and bottom
of heater clear and free of debris. This will
insure enough air for proper combustion.
7. If heater shuts off, do not relight until you
provide fresh, outside air. If heater keeps
shutting off, have it serviced.
SAFETY INFORMATION
Continued

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8. Do not run heater
• where flammable liquids or vapors are
used or stored
• under dusty conditions
9. Before using furniture polish, wax, carpet
cleanerorsimilarproducts,turnheateroff.If
heated,thevaporsfromtheseproductsmay
createawhitepowderresiduewithin 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. Turnoffandletcoolbeforeservicing.Only
a qualified service person should service
and repair heater.
12. Operating heater above elevations of
4,500 feet could cause pilot outage.
13. Toprevent performance problems, do not
usepropane/LPfueltankof less than 100
lbs. capacity.
14. Provide adequate clearances around air
openings.
LOCAL CODES
Install and use heater with care. Follow all lo-
cal 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
State of Massachusetts: The installation
must be made by a licensed plumber or
gas fitter in the Commonwealth of Mas-
sachusetts.
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.
SAFETY INFORMATION
Continued
Figure 1 - Vent-Free Gas Heater
Ignitor ButtonControl Knob
Heater
Cabinet
Front Panel Glass Panel Grill Guard
PRODUCT
IDENTIFICATION
UNPACKING
1. Remove heater from carton.
2. Remove all protective packaging applied
to heater for shipment.
3. Checkheater for any shippingdamage.If
heaterisdamaged, promptly informdealer
where you bought heater.
PRODUCT FEATURES
SAFETY DEVICE
Thisheaterhas a pilot with an OxygenDeple-
tionSensing(ODS) safety shutoffsystem.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
Thisheaterhas a piezo ignitor.Thissystemre-
quiresno matches, batteries or other sources
to light heater.
THERMOSTATIC HEAT CONTROL
Thermostat models have a thermostat sens-
ingbulbandacontrolvalve.This results in the
greatest heater comfort. This can also result
in lower gas bills.

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119169-01E 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-
tionandventilationair.Readthe
following instructions to insure
proper fresh air for this and
other fuel-burning appliances
in your home.
Today’shomes are builtmore energy efficient
thanever. New materials, increasedinsulation
and new construction methods help reduce
heat loss in homes. Home owners weather
strip and caulk around windows and doors
to keep the cold air out and the warm air in.
During heating months, home owners want
their homes as airtight as possible.
While it is good to make your home energy
efficient, your home needs to breathe. Fresh
air must enter your home.All fuel-burning ap-
pliancesneed fresh air for proper combustion
and ventilation.
Exhaust fans, fireplaces, clothes dryers and
fuelburningappliancesdrawairfromthehouse
to operate. You must provide adequate fresh
airforthese appliances.Thiswillinsureproper
venting of vented fuel-burning appliances.
PROVIDING ADEQUATE
VENTILATION
The following are excerptsfrom National Fuel
Gas Code, ANSI Z223.1/NFPA 54, Section
5.3, Air for Combustion and Ventilation.
All spaces in homes fall into one of the three
following ventilation classifications:
1. Unusually Tight Construction
2. Unconfined Space
3. Confined Space
Theinformationonpages5through7will help
youclassifyyourspaceandprovideadequate
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 defined as
construction where:
a. walls and ceilings exposed to the outside
atmosphere have a continuous water
vapor retarder with a rating of one perm
(6 x 10-11 kg per pa-sec-m2) or less with
openings gasketed or sealed and
b. weather stripping has been added on
openable windows and doors and
c. caulking or sealants are applied to areas
such as joints around window and door
frames, between sole plates and floors,
between wall-ceiling joints, between wall
panels,atpenetrationsforplumbing,electri-
cal and gas lines and at other openings.
If your home meets all of these three criteria,
you must provide additional fresh air. See
Ventilation Air From Outdoors, page 7.
If your home does not meet all of the three
criteriaabove,proceedto Determining Fresh-
Air Flow For Heater Location, page 6.
Confined and Unconfined Space
The National Fuel Gas Code, ANSI Z223.1/
NFPA54definesaconfinedspaceasaspace
whose volume is less than 50 cubic feet per
1,000 Btu per hour (4.8 m3per kw) of the ag-
gregateinput rating of all appliancesinstalled
in that space and an unconfined space as a
spacewhosevolume is not less than 50 cubic
feet per 1,000 Btu per hour (4.8 m3per kw)
of the aggregate input rating of all appliances
installedinthatspace. Rooms communicating
directlywiththespaceinwhichtheappliances
areinstalled*,throughopenings not furnished
with doors, are considered a part of the un-
confined space.
* Adjoining rooms are communicating only if
therearedoorlesspassagewaysor ventilation
grills between them.

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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 confined or unconfined space.
Space: Includesthe room in which youwill install
heater 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).
LengthxWidthx Height =__________cu. ft.
(volume of space)
Example: Space size 20 ft. (6.1 m) (length)
x 16 ft. (4.88 m) (width) x 8 ft. (2.44 m)
(ceiling height) = 2560 cu. ft. (72.49 m3)
(volume of space)
If additional ventilation to adjoining room
is supplied with grills or openings, add the
volume of these rooms to the total volume
of the space.
2. Multiply the space volume by 20 to determine
the maximum Btu/Hr the space can support.
________ (volume of space) x 20 = (Maxi-
mum Btu/Hr the space can support)
Example: 2560 cu. ft. (72.49 m3) (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.
Direct-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 can support)
_______ Btu/Hr (actual amount)
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 maximum Btu/Hr the space can sup-
port. 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
anunconfined space,removedoor toadjoin-
ing room or add ventilation grills between
rooms. See Ventilation Air From Inside
Building, page 7.
B. Vent room directly to the outdoors. See
Ventilation 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 maxi-
mum Btu/Hr the space can support, the space is
anunconfined space.You will needno additional
fresh air ventilation.
WARNING:Iftheareainwhich
the heater may be operated is
smaller than that defined as
an unconfined space or if the
building is of unusually tight
construction, provide adequate
combustion and ventilation air
byoneofthemethodsdescribed
in the National Fuel Gas Code,
ANSIZ223.1/NFPA54Section5.3
or applicable local codes.

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119169-01E 7
Figure 3 - Ventilation Air from Outdoors
VENTILATION AIR
Ventilation Air From Inside Building
This fresh air would come from an adjoining
unconfined space. When ventilating to an
adjoiningunconfinedspace, you must provide
twopermanentopenings:onewithin12"(30.5
cm)oftheceilingandonewithin12"(30.5cm)
of the floor on the wall connecting the two
spaces (see options 1 and 2, Figure 2). You
canalsoremove 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.
Figure 2 - Ventilation Air from Inside
Building
Or
Remove
Door into
Adjoining
Room,
Option 3
Ventilation Grills
Into Adjoining Room,
Option 2
12"
12"
Ventilation
Grills into
Adjoining
Room,
Option 1
Outlet
Air
Ventilated
Attic
Outlet
A
ir
Inlet
Air
Inlet Air Ventilated
Crawl Space
To
Crawl
Space
To Attic
AIR FOR COMBUSTION
AND VENTILATION
Continued
INSTALLATION
NOTICE:Thisheaterisintended
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
centralheatingsystem,youmay
run system’s circulating blower
whileusingheater.Thiswillhelp
circulatetheheatthroughoutthe
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
propane/LP). If your gas supply is not the
correct gas type, do not install heater. Call
dealer where you bought heater for proper
type heater.
WARNING:Thisapplianceis
equipped for either natural gas
or propane/LP gas but not both.
Gas type is indicated on the rat-
ingplate.Fieldconversionisnot
permitted.
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
andone within 12" of thefloor.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
inletoroutlet air into attic if attic has athermo-
stat-controlledpowervent. Heated air entering
the attic will activate the power vent.

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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*
• hardware packet
- wall anchor (4) 095112-02
- red key (1) 095116-01
- pan head screw, black (4) 097403-02
- nylon spacer (2) 099064-02
- clamp (1) 099123-01
- Phillips head screw, silver (4) 100159-02
* A CSA design-certified equipment shutoff
valvewith1/8"NPTtap is an acceptable alter-
native to test gauge connection. The optional
CSAdesign-certified equipment shutoff valve
can be purchased from your dealer. See Ac-
cessories, page 26.
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
included.
WARNING: Never install the
heater
• in a bedroom or bathroom
• in a recreational vehicle
• wherecurtains,furniture,cloth-
ingorotherflammableobjects
arelessthan36"fromthefront,
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,oilorkerosenelamps,etc.)in
the air exist, may discolor walls
or cause odors.
IMPORTANT: Vent-freeheaters add moisture
tothe air.Although this isbeneficial, installing
heater in rooms without enough ventilation
air may cause mildew to form from too much
moisture.SeeAirforCombustionandVentila-
tion, page 5. If high humidity 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" above floor
• locate heater where moving
vehicle will not hit it
For convenience and efficiency, install heater
• where there is easy access for operation,
inspection and service
• in coldest part of room
Anoptional fankitisavailable fromyourdealer.
See Accessories, page 26. If planning to use
fan, locate heater near an electrical outlet.
Minimum
From
Sides Of
Heater
36"
2"
FLOOR
CEILING
Minimum
Minimum To
Top Surface
Of Carpeting,
Tile Or Other
Combustible
Material
Left
Side
Right
Side
6"

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119169-01E 9
INSTALLATION
Continued
THERMOSTAT SENSING BULB
Locate thermostat sensing bulb.
1. Place clamp on thermostat sensing bulb
as shown in Figure 5. Clamp is provided
in hardware 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 thethermostat sensing
bulb is pointing up.
Figure 5 - Attaching Thermostat Sensing
Bulb
INSTALLING HEATER TO WALL
Mounting Bracket
Locatemountingbracketinheatercarton.Re-
move 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 four painted screws, two on
each side of front panel.
2. Pull bottom of front panel forward, then
out.
3. Remove any remaining packaging ma-
terials.
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 are 14" apart from their centers.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 pro-
vides the strongest hold. Insert mounting
screws through mounting bracket and into
wall studs.
Attaching to Wall Anchor: This method al-
lowsyouto attach mounting bracket to hollow
walls (wall areas between studs) or to solid
walls (concrete or masonry).
Decidewhichmethodbettersuitsyour needs.
Either 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 mount-
ing bracket is level.
WARNING: Maintain mini-
mumclearancesshowninFigure
8, page 10. If you can, provide
greater clearances from floor
and joining wall.
Screw
Front Panel

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INSTALLATION
Continued
30,000 Btu/Hr Models
20,000 Btu/Hr Models
Figure 8 - Mounting Bracket Clearances
Attaching Mounting Bracket To Wall
Note: Wall anchors, mounting screws and
spacers are in hardware package. The hard-
ware package is provided with heater.
Attaching To Wall Stud Method
For attaching mounting bracket to wall studs
1. Drillholesatmarkedlocations 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.
Figure 9 - Folding
Anchor
Figure 11 - Mounting Heater Onto
Mounting Bracket
Stand-
Out Tab
Adjoining Wall
Only Insert Mounting
Screws Through Last
Hole On Each End
Floor
14" (35.6 cm)
18
3
/ 4 "
(47.6 cm)
Min.
12"
(30.4
cm)
Min.
8"
(20.3
cm)
Min.
Adjoining Wall
Only Insert Mounting
Screws Through Last
Hole On Each End
Floor
14" (35.6 cm)
18
3
/ 4 "
(47.6 cm)
Min.
Figure 10 - Popping
Open Anchor Wings
For Thin Walls
Mounting Bracket
(attached to wall)
Horizontal Slots
Attaching To Wall Anchor Method
For attaching mounting bracket to hollow
walls(wallareasbetweenstuds)orsolidwalls
(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
intowallanchor.Pushred keyto“pop”open
anchor wings. IMPORTANT: Do not ham-
mer key! For thick walls (over 1/2" thick) or
solid walls, do not pop open wings.
5. Placemountingbracketontowall.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.
Placing Heater On Mounting Bracket
1. Locatetwo horizontal slots onbackpanel
of heater.
2. Placeheaterontomountingbracket.Slide
horizontal slots onto stand-out tabs on
mounting bracket.
2. Mark screw locations on wall (see Figure 8).
Note: Only mark last hole on each end of
mountingbracket.Insertmountingscrews
through these holes only.
3. Remove tape and mounting bracket from
wall.