Design Dynamics PFS VF-18N-MHD User manual

For more information, visit www.desatech.com
WARNING: If the information in this manual is not
followedexactly,afireorexplosionmayresultcausing
property damage, personal injury or loss of life.
— Do not store or use gasoline or other flammable
vaporsandliquidsinthevicinityofthisoranyother
appliance.
— WHAT TO DO IF YOU SMELL GAS
• Do not try to light any appliance.
• Donottouchanyelectricalswitch;donotuseany
phone in your building.
• Immediatelycallyourgassupplierfromaneighbor’s
phone. Follow the gas supplier’s instructions.
• If you cannot reach your gas supplier, call the fire
department.
— Installationandservicemustbeperformedbyaquali-
fied installer, service agency or the gas supplier.
MODELS VF-18N-MHD, VF-18P-MHD, VF-24N-MHD
AND VF-24P-MHD
UNVENTED (VENT-FREE) GAS LOG HEATER
OWNER’S OPERATION AND INSTALLATION MANUAL
INSTALLER: Leave this manual with the appliance.
CONSUMER: Retain this manual for future reference.

www.desatech.com 116986-01F2
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 may be in-
stalledin anaftermarket,*
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
SAFETY
WARNING: Improper
installation, adjustment,
alteration,serviceormain-
tenance can cause injury
or property damage. Refer
to this manual for correct
installation and operation-
al procedures. For assis-
tance or additional infor-
mation consult a qualified
installer,serviceagencyor
the gas supplier.
WARNING: This ap-
pliance is for installation
only in a solid-fuel burning
masonry or UL127 fac-
tory-built fireplace or in a
listed ventless firebox en-
closure. It is design-certi-
fied for these installations
in accordance with ANSI
Z21.11.2. Exception: Do
not install this appliance
in a factory-built fireplace
that includes instructions
statingithasnotbeentest-
ed or should not be used
with unvented gas logs.
TABLE OF CONTENTS
Safety .................................................................. 2
Unpacking............................................................ 4
Product Identification........................................... 5
Local Codes......................................................... 5
Product Features................................................. 5
Air For Combustion and Ventilation..................... 5
Installation ........................................................... 8
Operation........................................................... 15
Inspecting Burners ............................................ 19
Cleaning and Maintenance................................ 20
Troubleshooting................................................. 21
Wiring Diagram.................................................. 24
Replacement Parts............................................ 25
Service Hints ..................................................... 25
Technical Service............................................... 25
Accessories....................................................... 25
Parts.................................................................. 26
Warranty..............................................Back Cover

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116986-01F 3
WARNING:Thisproductcon-
tainsand/orgenerateschemicals
known to the State of California
to cause cancer or birth defects
or other reproductive 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.
DANGER:Carbonmonoxide
poisoning may lead to death!
Carbon Monoxide Poisoning: Early signs of
carbon monoxide poisoning resemble the flu,
with headaches, dizziness or nausea. If you
havethesesigns,theheater may not be work-
ingproperly. Get freshairatonce!Haveheater
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/LPgasesare odorless.Anodor-mak-
ing 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 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.
SAFETY
Continued
WARNING:Donotallowfans
to blow directly into the heater.
Avoidanydraftsthatalterburner
flame patterns. Ceiling fans can
create drafts that alter burner
flame patterns. Altered burner
patterns can cause sooting.
WARNING: Do not place
log scraps or lava rocks on
burner.
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.
Heaterbaseassemblybecomes
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.Allowsurfacetocool
before touching.
Carefully supervise young chil-
dren when they are in the room
with heater.
You must operate this heater
with a fireplace screen in place.
Make sure fireplace screen is
closed before running heater.
Keep the appliance area clear
and free from combustible ma-
terials, gasoline and other flam-
mable vapors and liquids.

www.desatech.com 116986-01F4
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) in-
sideanystructure.Locatepropane/LPsupply
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 touchany electrical switch; do not
use any phone in your building
• immediately call your gas supplier from
a neighbor’s phone. Follow the gas
supplier’s instructions
• if you cannot reach your gas supplier,
call the fire department
4. This heater shall not be installed in a
bedroom or bathroom.
5. Beforeinstallinginasolidfuelburningfire-
place, the chimney flue and firebox must
be cleaned of soot, creosote, ashes and
loosepaintbyaqualified chimneycleaner.
Creosotewillignite ifhighlyheated.Inspect
chimney flue 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. Iffireplacehasglassdoors,neveroperate
this heater with glass doors closed. If you
operate heater with doors closed, heat
buildupinsidefireplacewillcauseglassto
burst.Makesurethereare no obstructions
across openings of fireplace.
8. To prevent the creation of soot, follow the
instructionsinCleaningandMaintenance,
page 20.
9. Before using furniture polish, wax, carpet
cleanerorsimilarproducts,turnheateroff.If
SAFETY
Continued
heated,thevaporsfromtheseproductsmay
createawhitepowderresiduewithinburner
box or on adjacent walls or furniture.
10. This heater needs fresh, outside air ven-
tilationto run properly. This heater has an
oxygendepletionsensing(ODS)pilotlight
safety system. The ODS shuts down the
heater if not enough fresh air is available.
See Air for Combustion and Ventilation,
page 5. If heater keeps shutting off, see
Troubleshooting, page 21.
11. Do not run heater
• where flammable liquids or vapors are
used or stored
• under dusty conditions
12. Do not usethisheatertocookfoodor burn
paper or other objects.
13. Donotuseheaterifanyparthasbeenex-
posed 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. Donotoperateheaterifanylogisbroken.
Do not operate heater if a log is chipped
(dime-sized or larger).
15. Turnheateroffandlet coolbeforeservicing
orrepairing.Onlyaqualifiedserviceperson
should install, service or repair heater.
16. This heater does not need to be con-
nected to any external electrical source.
17. Topreventperformance problems, do not
usepropane/LPfueltankoflessthan100
lb. capacity (propane/LP units only).
18. Operating heater above elevations of
4,500 feet could cause pilot outage.
19. Provide adequate clearances around air
openings.
UNPACKING
CAUTION:Donotremovethe
data plates from the grate as-
sembly. The data plates contain
important warranty and safety
information.
1. Remove log set assembly from carton.
Note: Do not pick up assembly by logs.
Thiscoulddamageheater.Always handle
assembly by grate.
2. Remove all protective packaging applied
to log set for shipment.
3. Check heater for any shipping damage. If
heaterisdamagedcallDESAHeating, LLC
at 1-866-672-6040 for replacement parts
before returning to dealer.

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116986-01F 5
Figure 1 - Product Identification
PRODUCT IDENTIFICATION
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-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.
Hand-Held
Remote Control
Chassis Assembly
Control Valve with
Remote Receiver
Module
Log Set
Assembly
LOCAL CODES
Install and use heater with care. Follow all
local codes. In the absence of local codes,
use the latest edition of The National Fuel
Gas Code ANSI Z223.1/NFPA 54*.
*Available from:
American National Standards Institute, Inc.
1430 Broadway
New York, NY 10018
National Fire Protection Association, Inc.
Batterymarch Park
Quincy, MA 02269
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
realistic flames and glowing ceramic logs/
coals. This heater is designed for vent-free
operation with flue damper closed. It has
been tested and approved to ANSI Z21.11.2
standard for unvented heaters. State and lo-
cal codes in some areas prohibit the use of
vent-free heaters.
SAFETY PILOT
Thisheaterhasapilot with an Oxygen Deple-
tionSensing(ODS)safetyshutoffsystem.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.
REMOTE IGNITION AND CONTROL
This gas log set has a battery powered
electronic remote ignition and control. This
system requires no matches or other source
to light log set.
AIR FOR COMBUSTION AND VENTILATION
WARNING:Thisfireplaceshallnotbeinstalledinaroomorspace
unlesstherequired volume of indoor combustible air is provided by
the method described in the National Fuel Gas Code, ANSI Z223.1/
NFPA54, 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 efficient
than ever. New materials, increased insulation
andnewconstruction methodshelpreduceheat
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.

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While it is good to make your home energy effi-
cient,yourhomeneedstobreathe.Freshairmust
enteryourhome.Allfuel-burningappliancesneed
fresh air for proper combustion and ventilation.
Exhaust fans, fireplaces, clothes dryers and
fuelburningappliancesdrawairfrom thehouse
to operate. You must provide adequate fresh
airfortheseappliances.Thiswillinsureproper
venting of vented fuel-burning appliances.
PROVIDING ADEQUATE
VENTILATION
The following are excerptsfrom NationalFuel
Gas Code, ANSI Z223.1/NFPA 54, 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 out-
side atmosphere have a continuous
water vaporretarder with a ratingof one
perm (6 x 10-11 kg per pa-sec-m2) or less
with openings gasketed or sealed and
b. weather stripping has been added on
openable windows and doors and
c. caulking or sealants are applied to
areas such as joints around window
and door frames, between sole plates
and floors, between wall-ceiling joints,
between wall panels, at penetrations
for plumbing, electrical and gas lines
and at other openings.
If your home meets all of the three criteria
above, youmust provideadditional freshair.
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.
Confined and Unconfined Space
The National Fuel Gas Code, ANSI Z223.1/
NFPA54 defines a confined 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 unconfined space as a space
whosevolumeisnotlessthan50cubic feetper
1,000 Btu/hr (4.8 m3per kw) of the aggregate
input rating of all appliances installed in that
space.Roomscommunicatingdirectly withthe
space in which the appliances are installed*,
throughopeningsnotfurnished with doors,are
considered a part of the unconfined space.
* Adjoining rooms are communicating only if
therearedoorlesspassagewaysorventilation
grills between them.
DETERMINING FRESH-AIR FLOW
FOR HEATER LOCATION
Determining if You Have a Confined or
Unconfined Space
Use this work sheet to determine if you have
a confined or unconfined space.
Space: Includes the room in which you will
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).
LengthxWidthxHeight=__________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/Hrthespace can
support)
3. Add the Btu/Hr of all fuel burning appliances
in the space.
Vent-free fireplace __________Btu/Hr
Gas water heater* __________Btu/Hr
Gas furnace __________Btu/Hr
Vented gas heater __________Btu/Hr
Gas fireplace logs __________Btu/Hr
Other gas appliances + _________Btu/Hr
Total= __________Btu/Hr
* Do not include direct-vent gas appliances.
Direct-vent draws combustion air from the
outdoors and vents to the outdoors.
AIR FOR COMBUSTION AND VENTILATION
Continued

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116986-01F 7
AIR FOR COMBUSTION AND VENTILATION
Continued
Example:
Gas water heater __________Btu/Hr
Vent-free fireplace+ __________Btu/Hr
Total= __________Btu/Hr
4. Compare the maximum Btu/Hr the space
cansupportwiththe actual amountofBtu/Hr
used.
______Btu/Hr (max the space can support)
______Btu/Hr (actual amount Btu/Hr used)
Example: 51,200 Btu/Hr (maximum the
space can support)
73,000 Btu/Hr (actual amount of
Btu/Hr used)
The space in the example is a confined space
because the actual Btu/Hr used is more than the
maximum Btu/Hr the space can support. You
must provide additional fresh air. Your options
are as follows:
A. Rework worksheet, adding the space of an
adjoining room. If the extra space provides
anunconfinedspace, removedoortoadjoin-
ing room or add ventilation grills between
rooms. See Ventilation Air From Inside
Building.
B. Vent room directly to the outdoors. See
Ventilation Air From Outdoors.
C. Installalower Btu/Hrfireplace,if lowerBtu/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
anunconfinedspace. You will neednoadditional
fresh air ventilation.
WARNING:Iftheareainwhich
theheatermaybeoperateddoes
notmeettherequiredvolumefor
indoorcombustionair,combus-
tion and ventilation air shall be
providedby one of the methods
described in the National Fuel
GasCode,ANSIZ223.1/NFPA54,
theInternationalFuelGasCode,
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
adjoiningunconfinedspace,youmustprovide
twopermanentopenings:onewithin12" 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
Figure 2 - Ventilation Air from Inside
Building
Or
Remove
Door into
Adjoining
Room,
Option
3
Ventilation Grills
Into Adjoining Room,
Option 2
Ventilation
Grills
Into Adjoining
Room,
Option 1
12"
12"
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.
Figure 3 - Ventilation Air from Outdoors
Outlet
Air
Ventilated
Attic
Outlet
A
ir
Inlet
Air
Inlet Air Ventilated
Crawl Space
To
Crawl
Space
To Attic
40,000
33,000
73,000
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 the floor.Connectthese
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
inletoroutletairintoatticifattichas a thermo-
stat-controlledpowervent.Heatedair entering
the attic will activate the power vent.

www.desatech.com 116986-01F8
INSTALLATION
WARNING: Never install the
heater
• in a bedroom or bathroom
• in a recreational vehicle
• where curtains, furniture,
clothing or other flammable
objects are less than 36" from
the front, and 42" from top of
heater.Forsideclearancessee
Figure 4, page 9
• in high traffic 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 flu-
ids,oilorkerosenelamps,etc.)in
the air exist, may discolor walls
or cause odors.
WARNING: Antenna and
ignition cable must maintain a
spacing of 3/4". Failure to keep
them separated will result in
damagetothereceiver.SeeWir-
ing Diagram on page 24.
IMPORTANT: Vent-freeheatersaddmoisture
totheair.Althoughthisisbeneficial,installing
heater in rooms without enough ventilation
air may cause mildew to form from too much
moisture.SeeAirforCombustionandVentila-
tion, page 5.
CHECK GAS TYPE
Use the correct gas type (natural or propane/
LP) for your unit. If your gas supply is not cor-
rect, do not install heater. Call dealer where
you bought heater for proper type heater.
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.
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.
Creosote will ignite if highly
heated.Adirtychimneyfluemay
createanddistributesootwithin
thehouse.Inspectchimneyand
firebox flue for damage. If dam-
aged, repair flue and firebox
before operating heater.
WARNING: Seal any fresh
airvents or ash clean-out doors
located on floor or wall of fire-
place.If not, draftingmaycause
pilot outage or sooting. Use a
heat-resistant sealant. Do not
seal chimney flue damper.

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116986-01F 9
WARNING:Thisapplianceis
equipped for either natural gas
or propane/LP gas but not both.
Gas type is indicated on the rat-
ingplate.Fieldconversionisnot
permitted.
INSTALLATION AND CLEARANCES
FOR VENT-FREE OPERATION
WARNING: Maintain the
minimum clearances. If you
can,provide greater clearances
fromfloor, ceilingand adjoining
wall.
MINIMUM FIREPLACE CLEARANCE
TO COMBUSTIBLE MATERIALS
Side Wall 16", Ceiling 42",
Floor 5", Front 36"
INSTALLATION
Continued
Carefully follow the instructions below. This
will ensure safe installation into a masonry,
UL127-listed manufactured fireplace or listed
vent-free firebox enclosure.
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:Thefaceof a mantel, bookshelf,
etc. is made of combustible material and
protrudes 3 1/2" from the wall. This com-
bustiblematerial must be 4" from theside
of the fireplace cabinet (see Figure 4).
Note: When installing your gas logs into
a manufactured firebox, follow firebox
manufacturer’s instructions for minimum
clearances to combustible materials.
Figure 4 - Minimum Clearance for
Combustible to Wall
*Minimum 16" from Side Wall
*
Example
LOG SIZING REQUIREMENTS
Minimum Firebox Size
Log
Size Height Depth Front Width Rear* Width
18" 20" 14" 35" 22 1/2"
24" 20" 14" 35" 22 1/2"
*Measured at 14" depth
Minimum Noncombustible Material
Clearances
If Not Using Mantel
Note: If using a mantel, proceed to If Using
Mantel. If not using a mantel, follow the infor-
mation below.
You must have noncombustible material(s)
abovefireplaceopening. Noncombustible ma-
terials (such as slate, marble, tile, etc.) must
be at least 1/2" thick. With sheet metal, you
must have noncombustible material behind
it. Noncombustible material must extend at
least 8" up (for all models). If noncombustible
material is less than 12", you must install
the fireplace hood accessory (24" models
only). See Figure 5, page 10, for minimum
clearances.
If Using Mantel
You must have noncombustible material(s)
abovethefireplaceopening.Noncombustible
materials (such as slate, marble, tile, etc.)
must be at least 1/2" thick. With sheet metal,
you must have noncombustible material be-
hindit. Noncombustible material must extend
at least 8" up (for all models). If noncom-
bustible material is less than 12", you must
install the fireplace hood accessory. Even if
noncombustiblematerialismorethan 12", you
may need the hood accessory to deflect heat
awayfromyourmantelshelf.SeeFigures5,6
and 7, page 10, for minimum clearances.
B. Clearances from the top of the fireplace
opening to the ceiling should not be less
than 42".

www.desatech.com 116986-01F10
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
2 1/2"
6"
8"
10"
INSTALLATION
Continued
Figure 5 - Heat Resistant Material (Slate, Marble, Tile, etc.) Above Fireplace
Figure 7 - Minimum Mantel Clearances When Using Hood
Minimum
Noncombustible
Material
8"
Min.
12" 15" 18" 20"
2½"
6"
8"
10"
12"
Distances to
Underside of
Mantel
Hood
(GA6050,
GA6052 or
GA6053)
Top of
Fireplace
Opening
Underside
of Mantel
Shelf
Mantel Shelf
Noncombustible
Material Distance
(A)
Requirements for Safe Installation
12" or more Noncombustible material OK
Between 8" and
12" Install fire place hood accessory ( see
Accessories, page 25).
Less than 8 Noncombustible material must be ex-
tended to at least 8". See Between 8"
and 12", above. If you cannot extend
material, you must operate heater
with flue damper open.

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116986-01F 11
MANTEL CLEARANCES
In addition to meeting noncombustible mate-
rial clearances, you must also meet required
clearances between fireplace openings and
mantel shelf on each side of the fireplace. If
you do not meet the clearances listed below,
you will need a hood.
Determining Minimum Mantel Clearance
Ifyoumeetminimumclearance between man-
tel shelf and top of fireplace opening, a hood
is not required (see Figure 6, page 10).
Determining Minimum Mantel Clearance
When using a Hood
If minimum clearances in Figure 6, page 10
are not met, you must have a hood. When
using a hood there are still certain minimum
mantel clearances required. Follow minimum
clearances shown in Figure 7, page 10 when
using hood.
NOTICE: Surface temperatures
ofadjacentwallsandmantelsbe-
comehotduringoperation.Walls
and mantels above the firebox
may become hot to the touch.
If installed properly, these tem-
peratures meet the requirement
ofthenationalproductstandard.
Follow all minimum clearances
shown in this manual.
NOTICE:Ifyourinstallationdoes
not meet the minimum clear-
ances shown, you must do one
of the following:
• operate the logs only with the
flue damper open
• raise the mantel to an accept-
able 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"
tothefireplace,youmustinstallappliance
at least 5" above the combustible flooring
(see Figure 9).
INSTALLATION
Continued
Figure 8 - Minimum Fireplace Clearances
If Installed at Floor Level
Figure 9 - Minimum Fireplace Clearances
Above Combustible Flooring
14"
Min.
Combustible
Material
Noncombustible Material
Hearth
5"
Min.
Combustible
Material
INSTALLING HEATER ASSEMBLY
CAUTION:Donotremovethe
dataplatesattachedtotheheater
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 in-
sureadequate air flowand guard
against sooting and controls be-
ingdamaged.Raisefireplacefloor
with noncombustible material.
Make sure material is secure.
CAUTION: Do not pick up
heaterassemblybythelogs.This
could damage heater. Only han-
dle base assembly by grates.
IMPORTANT: Make sure the heater burner is
level. If heater is not level, heater will not work
properly.
IMPORTANT: Remote receiver module is at-
tachedtothevalvebyavelcrostrap.Thismodule
needs toremain where installed.Ifremoved and
wires cross, this can cause the remote to fail.

www.desatech.com 116986-01F12
CONNECTING TO GAS SUPPLY
WARNING: This appliance
requires a 1/2" NPT (National
Pipe Thread) inlet connection
to the shutoff valve.
WARNING:Aqualifiedservice
personmustconnectheatertogas
supply. Follow all local codes.
CAUTION: Never connect
propane/LP fireplace directly
to the propane/LP supply. This
heaterrequiresanexternalregu-
lator (not supplied). Install the
external regulator between the
heater and propane/LP supply.
WARNING: Never connect
natural gas fireplace to private
(non-utility) gas wells. This
gas is commonly known as
wellhead gas.
INSTALLATION
Continued
Fitting
Flexible Gas Hose
(if allowed by local
codes)
Figure 10 - Attaching Flexible Gas Hose
to Regulator
Installation Items Needed
Before installing heater, make sure you have
the items listed below.
• external regulator (for propane/LP units
only, 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
• approvedflexiblegaslinewithgasconnec-
tor (if allowed by local codes)
* A CSA design-certified equipment shutoff
valve with 1/8" NPT tap is an acceptable al-
ternative to test gauge connection. Purchase
the optional CSA design-certified equipment
shutoff valve from your dealer. See Acces-
sories, page 25.
For propane/LP units, the installer must
supply an external regulator. The external
regulator will reduce incoming gas pressure.
You must reduce incoming gas pressure to
between11"and14"ofwater. If you do not re-
duceincominggaspressure,heaterregulator
damagecouldoccur. Install external regulator
withtheventpointingdown asshowninFigure
11. Pointing the vent down protects it from
freezing rain or sleet.
CAUTION: Use only new,
black iron or steel pipe. Inter-
nally-tinned copper tubing may
be used in certain areas. Check
your local codes. Use pipe of
1/2"diameterorgreater toallow
proper gas volume to heater. If
pipe is too small, undue loss of
volume will occur.
Figure 11 - External Regulator With Vent
Pointing Down
Propane/LP
Supply Tank External
Regulator
with Vent
Pointing
Down
Installation Items Needed
• control cover kit (provided with heater)
• approved flexible gas hose (if allowed by
local codes)
• sealant (resistant to propane/LP gas, not
provided)
1. Apply pipe joint sealant lightly to male
threads of gas fitting (not provided).
Connect approved flexible gas hose to
inlet side of gas control (see Figure 10).
IMPORTANT: Hold gas fitting with wrench
when connecting flexible gas hose.
2. Position heater assembly in fireplace.
3. Connect to gas supply. See Connecting
to Gas Supply.

www.desatech.com
116986-01F 13
where trapped matter is not likely to freeze.
A sediment trap traps moisture and contami-
nants. 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
gas control. Hold gas control
withwrenchwhenconnectingit
to gas piping and/or fittings.
CHECKING GAS CONNECTIONS
WARNING:Testallgaspiping
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.
Applyanoncorrosiveleakdetec-
tion fluid to all joints. Bubbles
forming show a leak. Correct all
leaks at once.
CAUTION: Make sure exter-
nal regulator has been installed
between propane/LP supply
and heater. See guidelines un-
der Connecting to Gas Supply,
page 12.
PRESSURE TESTING GAS SUPPLY
PIPING SYSTEM
Test Pressures In Excess Of 1/2 PSIG
(14" W.C.)
1. Disconnect appliance with its appliance
main gas valve (control valve) and equip-
mentshutoffvalvefromgassupplypiping
system. Pressures in excess of 1/2 psig
will damage heater regulator.
2. Capoffopenend of gas pipewhereequip-
ment shutoff valve was connected.
3. Pressurizesupplypipingsystembyeither
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.
INSTALLATION
Continued
Installationmustincludeanequipmentshutoff
valve,unionandplugged1/8" NPTtap.Locate
NPT tap within reach for test gauge hook up.
NPT tap must be upstream from heater (see
Figure 12).
IMPORTANT: Install equipment shutoff valve
in an accessible location. The equipment
shutoff valve is for turning on or shutting off
the gas to the appliance.
Check your building codes for any special
requirements for locating equipment shutoff
valve to fireplaces.
Apply pipe joint sealant lightly to male NPT
threads.Thiswillpreventexcesssealantfrom
going into pipe. Excess sealant in pipe could
result in clogged heater valves.
WARNING: Use pipe joint
sealantthatisresistanttoliquid
petroleum (LP) gas.
We recommend that you install a sediment
trap in supply line as shown in Figure 12.
Locate sediment trap where it is within reach
for cleaning. Install in piping system between
fuel supply and heater. Locate sediment trap
* Purchase the optional CSAdesign-certified
equipmentshutoffvalve from your dealer.See
Accessories, page 25.
**Minimuminletpressureforpurposeofinput
adjustment.
Figure 12 - Gas Connection
3" Minimum
CSA Design-Certified
Equipment Shutoff Valve
With 1/8" NPT Tap*
Approved
Flexible Gas
Hose (if allowed
by local codes)
Cap Pipe Tee
Nipple Joint
Sediment Trap
Natural Gas
From Gas Meter
(5" W.C.** to 10.5"
W.C. Pressure)
Propane/LP Gas
From External
Regulator
(11" W.C.** to
14" W.C.
Pressure)
To Gas
Control

www.desatech.com 116986-01F14
INSTALLATION
Continued
Figure 13 - Equipment Shutoff Valve
Open
Closed
Equipment
Shutoff Valve
Figure 15 - Checking Gas Joints for
Propane/LP Gas
Control Valve Location
Propane/LP
Supply Tank Equipment Shutoff Valve
Figure 14 - Checking Gas Joints for
Natural Gas
Gas Meter
Equipment Shutoff Valve
Control Valve
Location
4. Checkalljointsofgassupplypipingsystem.
Applynoncorrosiveleakdetectionfluidtoall
joints. Bubbles forming show a leak.
5. Correct all leaks at once.
6. Reconnect heater and equipment shutoff
valve to gas supply. Check reconnected
fittings for leaks.
Test Pressures Equal To or Less Than
1/2 PSIG (14" W.C.)
1. Close equipment shutoff valve (see Fig-
ure 13).
2. Pressurizesupplypipingsystembyeither
opening propane/LP supply tank valve
for propane/LP gas or opening main gas
valve located on or near gas meter for
natural gas or using compressed air.
3. Check all joints from gas meter to equip-
ment shutoff valve for natural gas or
propane/LP supply to equipment shutoff
valveforpropane/LP(seeFigure14or15).
Apply noncorrosive leak detection fluid to
all joints. Bubbles forming show a leak.
4. Correct all leaks at once.
PRESSURE TESTING HEATER GAS
CONNECTIONS
1. Open equipment shutoff valve (see Fig-
ure 13).
2. Open main gas valve located on or near
gas meter for natural gas or open pro-
pane/LP supply tank valve.
3. Make sure control knob of heater is in the
OFF position.
4. Check all joints from equipment shutoff
valvetocontrol valve(seeFigure14or15).
Apply noncorrosive leak detection fluid to
all joints. Bubbles forming show a leak.
5. Correct all leaks at once.
6. Light heater (see Operation, page 15).
Check all other internal joints for leaks.
7. Turn off heater (see To Turn Off Gas to
Appliance, page 18).
ADDING EMBERS, LAVA ROCK AND
DECORATIVE LOGS
The effect of glowing embers is created by
placing ember material on the front burner.
1. Make sure the heater is OFF and has
cooled if it has been running.
2. Gently remove embers from the bag us-
ing gloves or tweezers. (This material is
a skin irritant. Gloves or tweezers are
recommended to prevent skin irrita-
tion). Separate the pieces.
3. Add embers to front flat burner as shown
in Figure 16. (12 pieces are supplied with
24"modelsand8pieces with 18" models.)
Additionalglowingeffectcanbeachieved
by fraying edges of ember material.
Figure 16 - Placement of Embers
Place Glowing Embers
on Burner Ports

www.desatech.com
116986-01F 15
OPERATION
Place Lava Rock and
Small Decorative
Logs in Front of
Burner
Figure 17 - Placement of Lava Rock
INSTALLATION
Continued
4. Add lava rock and small decorative logs
around base of heater if desired (see
Figure 17). You may place lava rock and
log pieces up to flat burner. DO NOT
place rock or logson front burner or on
logs. Placing any material on unit other
than ember material on front burner may
result in production of carbon monoxide
or soot.
WARNING: Do not operate
unitwithoutembermaterialcor-
rectlyinplaceasshowninFigure
16,page14.DoNOTplaceember
material anywhere else on the
unit. Use only ember material
supplied with unit. Excessive
or incorrectly placed ember
material may produce carbon
monoxide or soot.
WARNING: Do not use rock
wooloranyotherembermaterial
not supplied with this unit.
FOR YOUR SAFETY
READ BEFORE LIGHTING
WARNING: If you do not fol-
low 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 neighbor’s phone. Follow the
gas supplier’s instructions.
• If you cannot reach your gas supplier,
call the fire department.
C. Use only your hand to push in or turn
the gas control knob. Never use tools.
If the knob will not push in or turn by
hand, don’t try to repair it, call a quali-
fied service technician or gas supplier.
Force or attempted repair may result in
a fire or explosion.
D. Do not use this appliance if any part
has been under water. Immediately
call a qualified service technician to
inspect the appliance and to replace
any part of the control system and
any gas control which has been under
water.

www.desatech.com 116986-01F16
WARNING:Burnerwillcome
onautomaticallywithinonemin-
ute after pilot burner is lighted.
6. Pressthebuttons and at the same
time.Ashortacousticsignalconfirmsstart
sequence has begun.
Further short acoustic signals (0.2 sec.,
1 Hz) indicate the ignition process until it
iscompletedandmaingasflows.Ifpilotis
already lit, motor will turn on (max. flame
height)whilebuttonsarepresseddown.If
pilot does not light, see Troubleshooting,
page 21.
7. Press to turn on main burner and
increase flame height. Press to de-
crease flame height and shut off main
burner.
8. Short tapping of either button allows
incremental change in flame height.
9. Press OFF button to switch off main gas
and pilot gas.
10. To leave pilot lit and shut off burners only,
press to decrease flame height and
shut off main burner.
FUNCTIONS OF
REMOTE CONTROL
Battery
• Afterthechargedbatteryhas beencorrectly
installed, the remote hand set is ready for
operations.
• Remove the battery if the remote handset
will not be used more than one year.
Changing Code
The control is radio frequency operated. A
code (chosen from among 4,000 available
codes) is preset for all valves, but can be
changedifrequired(15additionalcodes avail-
able). Change DIP switch position. (The DIP
switch is located inside the hand held control
at the top of the battery compartment.) Then
pressthereceiver'sresetbutton on the bottom
ofthereceivermoduleuntilyouheara second
(longer) signal. When pressing the button
ontheremotehandsetin the following20sec.,
the receiver learns the new code.
OPERATION
Continued
REMOTE LIGHTING
INSTRUCTIONS
WARNING:
• If fireplace has glass doors,
never operate this heater with
glass doors closed. If you op-
erateheaterwithdoorsclosed,
heat buildup inside fireplace
willcauseglasstoburst.Make
suretherearenoobstructions
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:Duringinitialoperation
of new heater, burning logs will
give off a paper-burning smell.
Orange flame will also be pres-
ent. Open damper or window to
vent smell. This will only last a
few hours.
CAUTION: A mild gas flash
within 10 seconds is normal
during shutdown of this heater.
Remain clear of the hearth area
fortheentireshutdownprocess
to avoid possible injury.
1. STOP! Read the safety information,
page 15.
2. Makesureequipmentshutoffvalveisfully
open.
3. Turn motor knob clockwise to the
OFF position.
4. Wait five (5) minutes to clear out any gas.
Then smell for gas, including near the
floor. If you smell gas, STOP! Follow “B”
in the safety information, column 1. If you
don’t smell gas, go to the next step.
5. Make sure ON/OFF switch is in "–" (ON)
position.

www.desatech.com
116986-01F 17
OPERATION
Continued
Shut Off Procedure
To save battery power, press to turn main
gas to pilot gas. Press the OFF button to
shut off the device including pilot flame. The
device can be shut off with ON/OFF switch,
thus disabling remote hand set.
Setting Display (°C/24h and °F /12h)
Press and hold OFF and until display
changes from °F (and 12 hour clock) to °C
(and 24 hour clock) or vice versa.
Setting The Time
• After connecting battery or by simultane-
ously pressing and the display will
start to flash. You are in the set mode.
• From SET mode press to set the hour
and to set the minute.
• Wait or press OFF to return to manual
mode.
Battery Replacement
Remotehandsetbatteryneedstobechanged
when LED is dim. Battery life expectancy is
2 to 3 years. Replacement is recommended
at the beginning of heating season. Battery
needs to be changed when acoustic error
messageappearsduringignition(see Identify-
ing Error Signals from Receiver, page 24).
Changing Mode of Operation
• PresstheSETbuttonquicklytochangethe
mode of operation in the following order:
MAN, TEMP, TEMP, TIMER.
• Manual flame height adjustment (MAN ap-
pears on display): Press to turn on the
fire(mainburner)ortoincreaseflameheight.
Press to decrease flame or to go down
to pilot only. The receiver acknowledges the
transmission with an acoustic signal.
• Thedaytimetemperaturemode( TEMP
appears on display): The sensor in the
transmitter measures room temperature.
The controller compares the room tem-
perature with set temperature and sends
a signal to the receiver to turn gas valve
motor up or down, to adjust flame height
accordingly.
• The nighttime setback temperature (
TEMP appears on display): The sensor in
the transmitter measures the temperature
and adjusts it according to the nighttime
setback temperature. There is a bigger
temperature differential during this cycle.
• Timer: The timer mode (TIMER) operates
much like the temperature mode above.
The timer setting allows you to set specific
times for on and off. (There are 2 burner
onand 2 burner off cycles every 24 hours.)
If the reading for the nighttime temp. is
"– – –", the motor will turn off the valve to
standby pilot position and wait for the next
burner on cycle. This display shows the
setting temperature every 30 seconds.
Setting Temperature
• Select the desired mode of operation
(day or night) by pressing the SET button
briefly.
• Hold SET button until display flashes.
• Set temperature with the or (40°F is
the minimum temperature).
• Wait or press OFF to go to temperature
control mode.
• If temperature control in moon times
should be off (lower battery consumption),
decrease night temperature until "– – –"
appears on display.
Set Timer
• Switch to timer mode by pressing the SET
button briefly.
• Press the SET button until P1 flashes.
• Set hours with and minutes with .
• Press SET briefly for the next burner cycle
time.
• If all 4 times are set, pressing the OFF but-
ton or waiting will complete programming.
Shutting Off Heater
PressOFFbutton on remote control to switch
off main gas and pilot gas.
Shutting Off Burner Only (pilot stays lit)
Press to decrease the flame height and
shut off main burner.
SET
OFF
STAND
BY
Figure 18 - Control Panel for Hand-Held
Remote

www.desatech.com 116986-01F18
Lighting with Piezo Ignitor
1. Disconnectignitorcablefromreceiverand
connect to Piezo Ignitor Tab (see Figure
19 and Wiring Diagram on page 24).
2.
STOP! Read safety information on
page 15,
3. Makesureequipmentshutoffvalveisfully
open.
4. Turn motor knob clockwise to the
OFF position.
5. Wait (5) minutes to clear any gas and
then smell for gas around heater and
near floor. If you smell gas, STOP! follow
"B" on page 15.
6. ON/OFF switch in "—" ON position.
7. MAN knob on valve is in MAN position
(see Figure 19), When in MAN position
you can see a metallic core.
8. Push and hold down metal core fully with
a pen while the pilot gas flows.
9. Pressandreleasepiezoignitorbutton until
pilot lights.
10. Continue holding down metal core for
about 10 seconds and then release the
metal core. Pilot should stay lit. If not,
repeat steps 1 through 4.
11. TurnMANKnob to ON position - main gas
flows.
12. Turn motor knob to adjust flame. Knob
has a slipping clutch that allows manual
flame height adjustment.
TO TURN GAS OFF
TO APPLIANCE
PressOFFbutton on remote control to switch
off main gas and pilot gas or manually turn
Motor knob clockwise to the "O" OFF
position.
OPERATION
Continued
MANUAL LIGHTING
PROCEDURE
WARNING: Manual lighting
mustbeperformedbyaqualified
service person.
The system has a "MANUAL OVERRIDE"
feature that allows you to light with a match.
Lighting with a Match
1. STOP! Read the safety information on
page 15 .
2. Makesureequipmentshutoffvalveisfully
open.
3. Turn motor knob clockwise to to
OFF position.
4. Wait(5) minutes to clear any gasandthen
smellforgasaroundheater and near floor.
Ifyousmellgas,STOP!follow"B"onpage
15. If you do not smell gas, go to the next
step.
5. Make sure ON/OFF switch is in "–" (ON)
position.
6. MAN-knob (valve) in MAN position, a
metallic core is visible (see Figure 19).
7. Push and hold down metal core fully by
using a non-sharp object such as a pen.
This lets the pilot gas flow.
8. Light pilot burner with a match, (see
Figure 20).
9. Continue holding down metal core for
about 10 seconds. Pilot should stay lit
after releasing metal core. If not, repeat
step 1 thru 4.
10. Turn MAN knob to the ON position. This
lets main gas flow.
Figure 19 - Control Valve
Piezo
Ignitor
Tab
Metallic
Core for
Manual
Ignition
Piezo Ignitor ON/OFF Switch Microswitch
MAN Knob
in Manual
Position
Motor
Knob
in ON
Position
Figure 20 - Pilot
Pilot Burner
Thermocouple
11. Turnmotorknobto adjust flame.Knobhas
aslippingclutchthatallows manual flame
height adjustment as well as adjustment
to pilot gas.

www.desatech.com
116986-01F 19
Thermocouple
Thermocouple
Figure 22 - Incorrect Pilot Flame Pattern
(Natural Gas Pilot Shown)
Figure 21 - Correct Pilot Flame Pattern
(Natural Gas Pilot Shown)
BURNER FLAME PATTERN
Figure 23 shows correct burner flame pat-
tern.
NOTICE:Donotmistakeorange
flames with yellow tipping. Dirt
orotherfineparticlesareburned
byheater,causingbriefpatches
of orange flame.
If burner flame pattern is incorrect, as shown
in Figure 24
• turn appliance off (see To Turn Off Gas to
Appliance, page 18)
• see Troubleshooting, page 21
Figure 23 - Correct Burner Flame Pattern
Figure 24 - Incorrect Burner Flame
Pattern
Blue & Bright
Yellow Flames
Orange
Flames
INSPECTING BURNERS
Check pilot flame pattern and burner flame
patterns often.
PILOT FLAME PATTERN
Figure 21 shows a correct pilot flame pattern.
Figure 22 shows an incorrect pilot flame pat-
tern. The incorrect pilot flame is not touching
the thermocouple. When the thermocouple
cools, the heater will shut down.
If pilot flame pattern is incorrect, as shown
in Figure 22
• turn heater off (see To Turn Off Gas to Ap-
pliance, page 18)
• see Troubleshooting, page 21
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.

www.desatech.com 116986-01F20
Figure 26 - Injector Holder on Front
Burner Tube
Burner Tube
Primary Air
Inlet Opening
Injector
Holder
Injector
Figure 25 - Removing Front Log to Clean
Front Burner
Main Log
Assembly
Front Log
Assembly
Screws
Base
Assembly
Cleaning
Access
CLEANING AND
MAINTENANCE
WARNING: Turn off heater
and let cool before cleaning.
CAUTION: You must keep
control areas, burner and circu-
latingairpassagewaysofheater
clean. Inspect these areas of
heater before each use. Have
heater inspected yearly by a
qualifiedserviceperson.Heater
may need more frequent clean-
ing due to excessive lint from
carpeting,beddingmaterial,pet
hair, etc.
WARNING: Failure to keep
the primary air opening(s) of
theburner(s)cleanmayresultin
sooting and property damage.
BURNER INJECTOR HOLDER AIR
INLET HOLE
The primary air inlet holes allow the proper
amount of air to mix with the gas. This pro-
videsacleanburningflame.Keep these holes
clearofdust,dirt,lintandpethair.Clean these
air inlet holes prior to each heating season.
Blocked air holes will create soot. We recom-
mend that you clean the unit every 3 months
during operation and have heater inspected
yearly by a qualified service person.
Wealsorecommendthatyoukeeptheburner
tube clean and free of dust and dirt. We rec-
ommend using compressed air no greater
than 30 PSI. Your local computer store,
hardware store or home center may carry
compressedairin a can. If using compressed
airinacan,pleasefollowthedirectionsonthe
can. If you don't follow directions on the can,
you could damage the pilot assembly.
Before cleaning, shut off unit, including pilot.
Allow unit to cool for at least 30 minutes. You
will need to remove the front log to access
front burner.
1. Remove two screws from back of unit
that attach main log assembly to base
assembly (see Figure 25).
2 . Removescrews from left and right side of
front log assembly to remove from base
assembly (see Figure 25).
3. Inspect burner and primary air inlet holes
on injector holder of each burner for dust
and dirt (see Figures 25 and 26).
4. Blowairthrough the ports/slots and holes
in the burner.
5. Check the injector holder located at the
end of the burner tube again. Remove
any large particles of dust, dirt, lint or pet
hair with a soft cloth or vacuum cleaner
nozzle.
6. Blow air into the primary air holes on the
injector holder.
7. Incaseanylargeclumpsofdust have now
beenpushed into the burner repeatsteps
5 and 6.