Desa Firewerks VTDMV18NA Quick start guide

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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.
• Immediately call your gas supplier from a neighbor’s
phone. Follow the gas supplier’s instructions.
• If you cannot reach your gas supplier, call the fire
department.
— Installation and service must be performed by a quali-
fied installer, service agency or the gas supplier.
VENTED DECORATIVE GAS LOG HEATER
OWNER’S OPERATION AND INSTALLATION MANUAL
VTDMV24NA, VTDMV24PA,
VTDMV18NA AND VTDMV18PA

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2
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 appliance is for installation only in
a solid-fuel burning masonry or UL127 factory-built
fireplace, constructed of noncombustible material and
connected to a working flue. (See page 6 for minimum
flue opening.
WARNING: This is a gas-fired heater. It uses air (oxy-
gen) from the room in which it is installed. Provisions
for adequate combustion and ventilation air must be
provided. Refer to the National Fuel Gas Codes, ANSI
Z233.1/NFPA 54, Section 5.3, Air for Combustion and
Ventilation.
This appliance may be installed in an aftermarket,* per-
manently located, manufactured (mobile) home, where
not prohibited by local codes.
This appliance is only for use with the type of gas indi-
cated on the rating plate. This appliance is not convert-
ible for use with other gases.
* Aftermarket: Completion of sale, not for purpose of resale, from the manufacturer
State of Massachusetts: The installation must be made
by a licensed plumber or gas fitter in the Commonwealth
of Massachusetts.
TABLE OF CONTENTS
Safety Information ............................................... 3
Local Codes ........................................................ 4
Product Identification ........................................... 5
Unpacking ........................................................... 5
Product Features ................................................. 5
Installation ........................................................... 5
Operating Appliance .......................................... 10
Inspecting Burners .............................................11
Cleaning and Maintenance ................................ 12
Service Hints ..................................................... 12
Technical Service .............................................. 12
Replacement Parts ............................................ 12
Troubleshooting ................................................. 13
Specifications .................................................... 17
Accessories ....................................................... 17
Wiring Diagram .................................................. 17
Illustrated Parts Breakdown and Parts List ....... 18
Warranty Information ...........................Back Cover

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114926-01B 3
SAFETY INFORMATION
WARNING: This product con-
tains and/or generates chemicals
known to the State of California
to cause cancer or birth defects
or other reproductive harm.
WARNING: Keep flue open
when operating unit.
IMPORTANT: Read this owner’s
manual carefully and completely
before trying to assemble, operate
or service this log set. Improper use
of this log set can cause serious
injury or death from burns, fire,
explosion, electrical shock and
carbon monoxide poisoning.
DANGER: Carbon monoxide
poisoning may lead to death!
Carbon Monoxide Poisoning: Early signs of carbon
monoxide poisoning resemble the flu, with head-
aches, dizziness or nausea. If you have these signs,
the log set may not be working properly. Get fresh
air at once! Have log set 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 & LP Gas: Natural & LP gas are odorless.
An odor-making agent is added to the gas. 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 log set.
WARNING: Do not place log
scraps or lava rocks on burner.
WARNING: Any change to
this log set or its controls can
be dangerous.
WARNING: Do not use a blow-
er insert, heat exchanger insert or
other accessory not approved for
use with this appliance.
WARNING: This appliance
is equipped for (natural or pro-
pane/LP) gas. Field conversion
is not permitted.
WARNING: Do not allow fans
to blow directly into the fireplace.
Avoid any drafts that alter burner
flame patterns.
WARNING: Installed decora-
tive glass door enclosures must
be fully opened when operating
this gas appliance.
Due to high temperatures, the
appliance should be located out
of traffic and away from furniture
and draperies.
Do not place clothing or other
flammable material on or near
the appliance. Never place any
objects on the heater.
Appliance assembly becomes
very hot when running. Keep
children and adults away from hot
surface to avoid burns or clothing
ignition. Appliance will remain hot
for a time after shutdown. Allow
surface to cool before touching.
Carefully supervise young chil-
dren when they are in the room
with appliance.
You must operate this appliance
with a fireplace screen in place.
Make sure fireplace screen is
closed before running appliance.

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Keep the appliance area clear
and free from combustible ma-
terials, gasoline and other flam-
mable vapors and liquids.
Children and adults should be
alerted to the hazard of high tem-
perature and should stay away to
avoid burns or clothing ignition.
1. This appliance, as supplied, is only for use
with the type of gas indicated on the rating
plate. This appliance is not convertible for
use with other gases.
2. Do not place propane/LP supply tank(s) in-
side the structure. Locate propane/LP supply
tank(s) outdoors (propane/LP units only).
3. If you smell gas
• shut off gas supply
• do not try to light any appliance
• do not touch any electrical switch; do not use
any phone in your building
• immediately call your gas supplier from a
neighborʼs phone. Follow the gas supplierʼs
instructions
• if you cannot reach your gas supplier, call
the fire department
4. Never install the log set
• in a recreational vehicle
• where curtains, furniture, clothing or other
flammable objects are less than 42 inches
from the front, top or sides of the log set.
• in high traffic areas
• in windy or drafty areas
5. Before installing in a solid fuel burning fireplace,
the chimney flue and firebox must be cleaned of
soot, creosote, ashes and loose paint by a qualified
chimney cleaner. Creosote will ignite if highly
heated. Inspect chimney flue for damage. If dam-
aged, repair flue before operating appliance.
6. You must operate this log set with fireplace
screen in place and fully closed. Unless provided
by other means, screens shall have openings for
introduction of combustion air.
7. You must operate this log set with fireplace screen
in place and fully closed. Unless provided by
other means, screens shall have openings for
introduction of combustion air.
8. To reduce the creation of soot, follow the instruc-
tions in Cleaning and Maintenance, page 12.
SAFETY INFORMATION
Continued
9. Do not use a blower insert, heat exchanger
insert or other accessory not approved for use
with this log set.
10. The installation and provisions for combustion
and ventilation air must conform with the Na-
tional Fuel Gas Codes, ANSI Z233.1/NFPA 54,
Section 5.3, Air for combustion and Ventilation.
11. Do not run heater
• where flammable liquids or vapors are used
or stored
• under dusty conditions
12. Do not burn solid fuel in the fireplace after
installing the log set. Do not use this log set
to cook food or burn paper or other objects.
13. Log set becomes very hot when in use. Keep
children and adults away from hot surface to
avoid burns or clothing ignition. Log set will
remain hot for a time after shutdown. Allow
surface to cool before touching.
14. Carefully supervise young children when they
are in the room with the log set.
15. Do not use heater if any part has been exposed
to or under water. Immediately call a qualified
service technician to inspect the room heater
and to replace any part of the control system and
any gas control which has been under water.
16. Turn log set off and let cool before servicing,
installing or repairing. Only a qualified service
person should install, service or repair log set.
17. Provide adequate clearances around air
openings.
LOCAL CODES
Install and use log set with care. Follow all local
codes. In the absence of local codes, use the lat-
est edition of the National Fuel Gas Code ANSI
Z223.1/NFPA 54*
*Available from:
American National Standards Institute, Inc.
1430 Broadway
New York, NY 10018
National Fire Protection Association, Inc.
Battery march park
Quincy, MA 02269

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114926-01B 5
PRODUCT
IDENTIFICATION
WARNING: Failure to posi-
tion the parts in accordance
with these diagrams or failure
to use only parts specifically
approved with this appliance
may result in property damage
or personal injury.
Figure 1 - Product Identification
Log Set
Assembly
Piezo
Ignitor
Control
Knobs
Chassis
Assembly
Ember Pod
UNPACKING
CAUTION: Do not remove the
data plates from the grate as-
sembly. The data plates contain
important warranty and safety
information.
1. Remove log set assembly from carton.
IMPORTANT: Do not pick up assembly by
logs. This could damage the unit. Always
handle assembly by grate.
2. Remove all protective packaging applied to log
set for shipment.
3. Check all items for any shipping damage. If
damaged, promptly inform dealer where you
bought appliance.
PRODUCT FEATURES
This unitized gas log set is tested and approved to
ANSIZ21.60-2003 and CSA 2.2-2003 as a vented
decorative appliance.
This unit has a piezo ignitor. This system requires
no matches, batteries or other sources to light ap-
pliance.
INSTALLATION
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. Creo-
sote will ignite if highly heated. A
dirty chimney flue may create and
distribute soot within the house.
Inspect chimney flue for damage.
If damaged, repair flue damper
before operating appliance.
CAUTION: This heater creates
warm air currents. These currents
move heat to wall surfaces next
to heater. Installing heater next
to vinyl or cloth wall coverings or
operating heater where impurities
(such as, but not limited to, to-
bacco smoke, aromatic candles,
cleaning fluids, oil or kerosene
lamps, etc.) in the air exist, may
discolor walls or cause odors.
NOTICE: Installation, service and
repair of this appliance must be
performed by a qualified installer,
service agency, company or
gas supplier experienced with
this type of gas appliance. Only
factory authorized components
listed in these instructions may
be used in accordance with the
manufacturer's instructions and
all codes and requirements of
the authority having jurisdiction.
Any modifications to or use of
unauthorized components or
accessory items will void the
manufacturer’s warranty and may
result in a hazardous condition.

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CHECK GAS TYPE
Use the correct gas type (natural or propane/LP) for
your unit. If your gas supply is not correct, do not
instal in fireplace. Call dealer where you bought
the appliance for proper type of appliance.
WARNING: This appliance
is equipped for (natural or pro-
pane/LP) gas. Field conversion
is not permitted.
INSTALLATION AND CLEARANCES
Figure 2 shows technical information regarding
the installation of your gas log set. Please make
sure all specifications shown are applicable before
installation is attempted.
LOG SIZING REQUIREMENTS
MINIMUM FIREBOX SIZE
LOG FRONT REAR* MIN. FLUE
SIZE HEIGHT DEPTH WIDTH WIDTH SIZE
18" 20" 14" 25" 20.5" 6.5"
24" 20" 14" 29" 24.5" 6.5"
*Measured at 14" depth
Figure 4 - Attaching Damper Clamp
Manufactured
Fireplace
Masonry
Fireplace
Damper
Damper
Clamp
Damper
Damper
Clamp Damper
VENTING SPECIFICATIONS FOR
INSTALLATION
The fireplace chimney flue and vent must be draft-
ing properly. To check the vent for proper drafting:
Light a tightly rolled newspaper on one end and
place it at the inside front edge of the fireplace.
Observe the smoke and be sure the vent is properly
INSTALLATION
Continued
SPECIFICATIONS (W.C.)
FUEL INLET MANIFOLD
PRESSURE PRESSURE
Min. Max.
NG 7" 10.5" 3.5"
LP 11" 14" 10"
FLUE OPENING SPECIFICATIONS
Note: This vented appliance must be installed only
in a solid-fuel burning or UL127 factory-built fire-
place constructed of noncombustible material and
connected to a working flue. The fireplace chimney
must have a permanent vent opening to outside
with minimum openings shown in Figure 3.
Figure 2 - Technical Information Chart
Figure 3 - Sizes and Clearances
drawing it up the chimney. If the smoke spills out
into the room, extinguish the flame and remove any
obstruction until proper venting is achieved.
The chimney flue damper must be fixed open to pro-
vide a minimum of 32 square inch of free air opening
at all times during operation of the log set. A damper
clamp is included to secure the damper.
The minimum flue sizes shown in Figure 3 are
based on a 6' chimney height using round pipe. Your
minimum flue size will vary based on input rate and
chimney height. Refer to the National Fuel Gas Code
ANSI Z223.1/NFPA 54, Section 6.6 for details.
INSTALLING DAMPER CLAMP
Secure the damper stop clam to the edge of the
damper as shown in Figure 4. If for any reason
this clamp doesn't work on your fireplace, another
suitable clamp or permanent stop must be installed,
or the damper blade must be cut or removed.
Valve Bracket
INSTALLING REMOTE CONTROL
ACCESSORY BRACKET
If installing optional remote control accessory you
will need to install the remote accessory bracket
for the receiver.
Use screws provided to attach bracket to valve
bracket as shown in Figure 5.
Follow installation instructions included with
remote accessory.
Figure 5 - Attaching Remote Bracket to
Valve Bracket
Remote
Bracket

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114926-01B 7
INSTALLING APPLIANCE
WARNING: Special care is
required if you are installing the
unit into a sunken fireplace. You
must raise the fireplace floor to
allow access to gas log controls.
This will insure adequate air
flow and guard against sooting.
Raise the fireplace floor using
noncombustible material.
CAUTION: Do not pick up ap-
pliance assembly by logs. This
could damage unit. Only handle
assembly by grate.
IMPORTANT: Make sure appliance is level. If
unit is not level it will not work properly.
Center the appliance in the fireplace. Make certain
the grate front feet sit inside the front edge of
the fireplace and that there is adequate clearance
around the appliance for access and operation.
Note: The installation of appliances designed for
manufactured home (U.S. only) or mobile home
installation must conform with the standard CAN/
CSA Z240, Mobile Housing, in Canada, or with
the Manufactured Home Construction and Safety
Standard, Title 24 CFR, Part 3280, in the United
States, or when such a standard is not applicable,
ANSI/NCSBCSA225.1/NFPA501A, Manufactured
Home Installations Standard.
CONNECTING TO GAS SUPPLY
WARNING: A qualified service
person must connect heater to gas
supply. Follow all local codes.
WARNING: This appliance
requires a 3/8" NPT (National Pipe
Thread) inlet connection to the
control valve.
INSTALLATION
Continued CAUTION: Never connect
propane/LP unit directly to the
propane/LP supply. This unit re-
quires an external regulator (not
supplied). Install the external
regulator between the unit and
the propane/LP supply.
WARNING: Never connect
natural gas fireplace to private
(non-utility) gas wells. This
gas is commonly known as
wellhead gas.
Installation Items Needed
Before installing heater, make sure you have the
items listed below.
• approved flexible gas hose and fittings (supplied
with appliance -if allowed by local codes)
• external regulator (propane/LP models only)
• piping (check local codes)
• sealant (resistant to propane/LP gas)
• equipment shutoff valve*
• test gauge connection*
• sediment trap
• tee joint
• pipe wrench
* A CSA design-certified equipment shutoff valve
with 1/8" NPT tap is an acceptable alternative to
test gauge connection. Purchase the optional CSA
design-certified equipment shutoff valve from your
dealer. See Accessories, page 17.
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 between 11 and 14 inches of water. If you
do not reduce incoming gas pressure, control valve
damage could occur. Install external regulator with the
vent pointing down as shown in Figure 6. Pointing the
vent down protects it from freezing rain or sleet.
Propane/LP
Supply Tank External
Regulator
Vent
Pointing
Down
Figure 6 - External Regulator with Vent
Pointing Down

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8
INSTALLATION
Continued
CAUTION: Use only new, black
iron or steel pipe. Internally-tinned
copper tubing may be used in
certain areas. Check your local
codes. Use pipe of 1/2" diameter
or greater to allow proper gas vol-
ume to heater. If pipe is too small,
undue loss of volume will occur.
Installation must include an equipment shutoff
valve, union and plugged 1/8" NPT tap. Locate NPT
tap within reach for test gauge hook up. NPT tap
must be upstream from log set (see Figure 7).
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.
Apply pipe joint sealant lightly to male NPT
threads. This will prevent excess sealant from
going into pipe. Excess sealant in pipe could result
in clogged heater valves.
WARNING: Use pipe joint
sealant that is resistant to liquid
petroleum (LP) gas.
We recommend that you install a sediment trap in
supply line as shown in Figure 7. Locate sediment
trap where it is within reach for cleaning. Install in
piping system between fuel supply and appliance.
Figure 7 - Gas Connection
* Purchase the optional CSA design-certified shutoff
valve from your dealer. See Accessories, page 17.
** Minimum inlet pressure for purpose of input
adjustment.
Approved Flexible
Gas Hose (If
allowed by local
codes)
CSA Design-Certified
Equipment Shutoff
Valve with 1/8" NPT
Tap*
Natural
From Gas
Meter (5" W.C.**
to 10.5" W.C.
Pressure)
Propane/LP
From External
Regulator (11"
W.C.** to 14"
W.C. Pressure)
3" Min.
Pipe Cap Tee
Nipple Joint
CHECKING GAS CONNECTIONS
WARNING: Test all gas piping
and connections for leaks after
installing or servicing. Correct
all leaks at once.
WARNING: Never use an open
flame to check for a leak. Apply a
noncorrosive leak detection 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 appliance. See guidelines
under Connecting to Gas Sup-
ply, page 7.
PRESSURE TESTING GAS SUPPLY
PIPING SYSTEM
Test Pressures In Excess Of 1/2 PSIG
(3.5 kPa)
1. Disconnect appliance with its appliance main
gas valve (control valve) and equipment shutoff
valve from gas supply piping system. Pressures
in excess of 1/2 psig will damage control valve.
2. Cap off open end of gas pipe where equipment
shutoff valve was connected.
3. Pressurize supply piping system by either
opening propane/LP supply tank valve for
propane/LP gas or opening main gas valve
located on or near gas meter for natural gas
or using compressed air.
4. Check all joints of gas supply piping system.
Apply noncorrosive leak detection fluid to all
joints. Bubbles forming show a leak.
5. Correct all leaks at once.
Locate sediment trap where trapped matter is not
likely to freeze. A sediment trap traps moisture and
contaminants. This keeps them from going into
heater controls. If sediment trap is not installed or
is installed wrong, heater may not run properly.
CAUTION: Avoid damage to
gas control. Hold gas control
with wrench when connecting it
to gas piping and/or fittings.
Sedament Trap

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114926-01B 9
INSTALLATION
Continued
Figure 8 - Equipment Shutoff Valve
Equipment
Shutoff
Valve
Open
Closed
Figure 10 - Checking Gas Joints
(Natural Gas Only)
Control Valve
Location
Equipment
Shutoff Valve
Propane/LP
Supply Tank
Equipment
Shutoff Valve
Gas Meter
Figure 9 - Checking Gas Joints
(Propane/LP Gas Only)
Control Valve
Location
6. Reconnect heater and equipment shutoff
valve to gas supply. Check reconnected fit-
tings for leaks.
Test Pressures Equal To or Less Than
1/2 PSIG (3.5 kPa)
1. Close equipment shutoff valve (see Figure 8).
2. Pressurize supply piping system by either
opening propane/LP supply tank valve for
propane/LP gas or opening main gas valve
located on or near gas meter for natural gas
or using compressed air.
3. Check all joints from gas meter to equipment
shutoff valve for natural gas or propane/LP supply
to equipment shutoff valve for propane/LP (see
Figure 9 or 10). Apply noncorrosive leak detection
fluid to all joints. Bubbles forming show a leak.
4. Correct all leaks at once.
Pressure Testing Appliance Gas
Connections
1. Open equipment shutoff valve (see Figure 8).
2. Open main gas valve located on or near gas
meter for natural gas or open propane/LP
supply tank valve.
3. Make sure control knob of appliance is in the
OFF position.
4. Check all joints from equipment shutoff valve
to gas control (see Figure 9 or 10). Apply
noncorrosive leak detection fluid to all joints.
Bubbles forming show a leak.
5. Correct all leaks at once.
6. Light appliance (see Operating Appliance,
page 10) Check all other internal joints for
leaks.
7. Turn off appliance.
PLACEMENT OF LOOSE EMBERS
CAUTION: Do not place
any loose embers around pilot
assembly.
Two bags of loose embers are provided with this
unit. For this installation use the embers that are
approximately 1" square in size. If needed, larger
embers can be broken to size. These embers aid
in concealing the burner pan, directing flames
through the ember bed, quiet operation of the unit
and gives a natural random flame pattern.
Place embers as follows:
1. Place embers around the center ember bed or
ember pod.
2. Place individual embers on their edge (not flat)
along the top of the burner pan. This aids in
directing flames from the burner through the
ember bed.
Note: Too many embers or embers placed flat
along burner pan can suppress the flames.
3. When unit is lit, check flames for random appear-
ance and ember bed glowing red-orange in color
(see Burner Flame Pattern, page 11). If this is
not happening, either add, remove or reposition
loose embers. IMPORTANT: Turn unit off and
let cool before repositioning loose embers.
Figure 11 - Placement of Embers

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10
5. Wait five (5) minutes to clear out any gas.
If you then smell gas, STOP! Follow "B" in
the safety information in column 1. If you
don't smell gas, go on the next step.
6. Press in and turn control knob counter-
clockwise to the PILOT position.
Press in control knob for five (5) seconds
(see Figure 12).
7. With control knob pressed in, press and release
ignitor button. This will light pilot. If needed,
keep pressing ignitor button until pilot lights.
Note: If pilot does not stay lit, contact a
qualified service person or gas supplier for
repairs.
8. Keep control knob pressed in for 30 seconds
after lighting pilot. After 30 seconds, release
control knob.
• If control knob does not pop out when
released, contact a qualified service person
or gas supplier for repairs.
Note: If pilot goes out, repeat steps 4
through 8.
9. Slightly push in and turn control knob coun-
terclockwise to the ON position.
10. Wait one minute and move switch to the
ON position to light burner. Note: AUTO is
only functional when using optional remote
control accessory.
11. Set flame adjustment knob to any level
between HI and LO.
Figure 12 - Setting Control Knobs
Piezo Ignitor
Control
Knob
Flame Adjustment Knob
TO TURN OFF GAS
TO APPLIANCE
1. Push switch into OFF position. The pilot
will remain lit for normal service.
2. Access control knobs.
3. Depress gas control knob slightly and turn
clockwise to OFF. Do not force.
OPTIONAL HAND-HELD
REMOTE OPERATION
Note: Remote control accessory must be pur-
chased separately (see Accessories, page 17).
Follow instructions included with the remote
control.
OPERATING APPLIANCE
FOR YOUR SAFETY
READ BEFORE LIGHTING
WARNING: Keep flue open
when operating unit.
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 with a piezo ignitor. When lightning
the pilot, follow these instructions exactly.
B. BEFORE LIGHTING smell all around the
appliance area for gas. Be sure to smell next
to the floor because some gas is heavier than
air and will settle on the floor.
WHAT TO DO IF YOU SMELL GAS
• Do not try to light any appliance.
• Do not touch any electric switch; do not
use any phone in your building.
• Immediately call your gas supplier from
a neighborʼs phone. Follow the gas
supplierʼs instructions.
• If you cannot reach your gas supplier, call
the fire department.
C. Use only your hand to push in or turn gas
control knob. Never use tools. If the knob
will not push in or turn by hand, do not try
to repair it, call a qualified technician. Force
or attempted repair may result in a fire.
D. Do not use this appliance if any part has been
under water. Immediately call a qualified
service technician to inspect the appliance and
to replace any part of the control system and
any gas control which has been under water.
LIGHTING
INSTRUCTIONS
1. STOP! Read the safety information,
above.
2. Make sure switch is in OFF position.
3. Be sure gas line shut-off valve is OPEN.
4. Press in and turn control knob clockwise
to the OFF position (see Figure 12).
Note: Knob cannot be turned from PILOT
to OFF unless knob is pushed in slightly. DO
NOT FORCE.