Desa Comfort Glow CGN10T Quick start guide

Save this manual for future reference.
WARNING: If the information in this manual is not followed exactly, a fire or
explosion may result causing property damage, personal injury, or loss of life.
— Do not store or use gasoline or other flammable vapors and liquids in the
vicinity of this or any other appliance.
— WHAT TO DO IF YOU SMELL GAS
• Do not try to light any appliance.
• Do not touch any electrical switch; do not use any phone in your building.
• Immediatelycallyourgassupplierfromaneighbor’sphone.Followthegas
supplier’s instructions.
• If you cannot reach your gas supplier, call the fire department.
— Installation and service must be performed by a qualified installer, service
agency, or the gas supplier.
Thisappliancemaybeinstalledinanaftermarket*manufactured(mobile)home,
where not prohibited by state or local codes.
* Aftermarket: Completion of sale, not for purpose of resale, from the manufacturer
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.
®
VENT-FREE NATURAL GAS HEATER
OWNER’S OPERATION AND INSTALLATION MANUAL
Model: CGN10T

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102921
WARNING ICON G001
WARNINGS
IMPORTANT: Read this owner’s manual carefully and completely
before trying to assemble, operate, or service this heater. Improper
use of this heater can cause serious injury or death from burns, fire,
explosion, and carbon monoxide poisoning.
WARNING ICON G001
DANGER
Carbon monoxide poisoning may lead to death!
Carbon Monoxide Poisoning: Early signs of carbon monoxide poisoning
resembletheflu,withheadaches,dizziness,and/ornausea.Ifyouhavethesesigns,
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
includepregnant women, people with heartorlung disease or anemia, thoseunder
the influence of alcohol, and those at high altitudes.
Natural Gas: Natural gas is odorless. An odor-making agent is added to natural
gas. The odor helps you detect a natural gas leak. However, the odor added to
natural gas can fade. Natural 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.
CONTENTS SECTION PAGE
Safety Information......................................................................... 2
Product Identification .................................................................... 4
Local Codes ...................................................................................4
Unpacking......................................................................................4
Product Features ............................................................................4
Air For Combustion and Ventilation ............................................. 5
Installing To Wall.......................................................................... 9
Connecting To Gas Supply............................................................13
Checking Gas Connections............................................................14
Operating Heater ........................................................................... 16
Inspecting Burner ..........................................................................19
Cleaning And Maintenance ...........................................................21
Troubleshooting.............................................................................21
Technical Service ..........................................................................25
Specifications ................................................................................ 25
Service Hints ................................................................................. 25
Illustrated Parts Breakdown .......................................................... 26
Parts List ........................................................................................ 27
Replacement Parts .........................................................................28
Service Publications ......................................................................28
Accessory ......................................................................................28
Parts Central ..................................................................................29
Warranty Information .................................................................... Back Cover
Safety Information continues on next page

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102921
SAFETY
INFORMATION
Continued
WARNING ICON G 001
WARNINGS Continued
WARNING: Any change to this heater or its controls can be dangerous.
1. This appliance is only for use with the type of gas indicated on the rating
plate. This appliance is not convertible for use with other gases.
2. If you smell gas
• shut off gas supply
• do not try to light any appliance
• do not touch any electrical switch; do not use any phone in your building
• immediately call your gas supplier from a neighbor’s phone. Follow the
gas supplier’s instructions
• if you cannot reach your gas supplier, call the fire department
3. Heater shall not be installed in a bathroom.
4. Never install the heater
• in a recreational vehicle
• where curtains, furniture, clothing, or other flammable objects are less than
36 inches from the front, top, or sides of the heater
• as a fireplace insert
• in high traffic areas
• in windy or drafty areas
5. This heater needs fresh, outside air ventilation to run properly. This heater has
an oxygen depletion sensor (ODS) pilot light safety system. The ODS shuts
down the heater if not enough fresh air is available. See Air for Combustion
and Ventilation, pages 5 through 8.
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.
8. Do not run heater
• where flammable liquids or vapors are used or stored
• under dusty conditions
9. Never place any objects on the heater.
10.Surface of heater becomes very hot when running heater. Keep children and
adults away from hot surface to avoid burns or clothing ignition. Heater will
remain hot for a time after shutdown. Allow surface to cool before touching.
11.Carefully supervise young children when they are in same room with heater.
12.Make sure grill guard is in place before running heater.
13. Do not use heater if any part has been under water. Immediately call a quali-
fied 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.Turn off heater and let cool before servicing. Only a qualified service person
should service and repair heater.
15.Operating heater above elevations of 4,500 feet could cause pilot outage.

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102921
PRODUCT
IDENTIFICATION
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 also
known as 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
Figure 1 - Vent-Free Natural Gas Heater
Heater
Cabinet
Grill
Guard
Glass
Panel
Front
Panel
Control Knob
Ignitor Button
1. Remove heater from carton.
2. Remove all protective packaging applied to heater for shipment.
3. Check heater for any shipping damage. If heater is damaged, promptly inform
dealer where you bought heater.
UNPACKING
PRODUCT
FEATURES
Safety Device
This heater has a pilot with an Oxygen Depletion Sensor Shutoff System (ODS).
The ODS/pilot is a required feature for vent-free room heaters. The ODS/pilot shuts
off the heater if there is not enough fresh air.
Piezo Ignition System
This heater has a piezo ignitor. This system requires no matches, batteries, or other
sources to light heater.
Thermostatic Heat Control
This heater has a thermostat sensing bulb and thermostat control. This resuts in the
greatest heater comfort. This can also result in lower gas bills.

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102921
AIR FOR
COMBUSTION
AND
VENTILATION
WARNING ICON G001
WARNING
This heater shall not be installed in a confined space unless
provisions are provided for adequate combustion and ventilation
air. 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, 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 appliances need fresh air for
proper combustion and ventilation.
Exhaust fans, fireplaces, clothes dryers, and fuel burning appliances draw air from
the house to operate. You must provide adequate fresh air for these appliances.
This will insure proper venting of vented fuel-burning appliances.
Continued
Unconfined Space
The National Fuel Gas Code, ANSIZ223.1, 1992, Section 5.3 defines uncon-
fined space as having a minimum air volume of 50 cubic feet (127 cubic cm) for
each 1000 Btu/Hr input rating of all appliances in the space (cubic feet equals
length x width x height of space). Include adjoining rooms only if there are
doorless passageways or ventilation grills between the rooms.
Confined Space
The National Fuel Gas Code, ANSIZ223.1, 1992, Section 5.3 defines confined
space as having an air volume of less than 50 cubic feet (127 cubic cm) for each
1000 Btu/Hr input rating of all appliances in the space (cubic feet equals length
x width x height of space). Include adjoining rooms only if there are doorless
passageways or ventilation grills between the rooms.
PROVIDING ADEQUATE VENTILATION
The following is exerpts from National Fuel Gas Code. NFPA 54/ANSI Z223.1,
Section 5.3, Air for Combustion and Ventilation.
All spaces in homes fall into one of the three following ventilation classifications:
1. Unusually Tight Contruction; 2. Unconfined Space; 3. Confined Space.
The information on pages 5 through 8 will help you classify your space and provide
adequate ventilation.
Unusually Tight Construction
The air that leaks around doors and windows may provide enough fresh air for
combustion and ventilation. However, in buildings of unusually 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 continu-
ous water vapor retarder with a rating of one perm or less with open-
ings 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, you must provide addi-
tional fresh air. See Ventilation Air From Outdoors , page 8 .
If your home does not meet all of the three criteria above, proceed to page 6.

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AIR FOR
COMBUSTION
AND
VENTILATION
Continued
DETERMINING AIR FLOW FOR HEATER LOCATION
Determining if You Have a Confined or Unconfined Space
Use this worksheet 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).
Length x Width x Height = ___________________ cu. ft. (volume of space)
Example: Space size 18 ft. (length) x 16 ft. (width) x 8 ft. (ceiling height) =
2304 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. Divide the space volume by 50 cubic feet to determine the maximum Btu/Hr the space
can support.
____________ (volume of space) ÷50 cu. ft. = (Maximum Btu/Hr the space can
support)
Example: 2304cu.ft.(volumeof space) ÷50 cu. ft. = 46.1or 46,100 (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
Example: Gas water heater 40,000 Btu/Hr
Vent-free heater +10,000 Btu/Hr
Total =50,000 Btu/Hr
* Do not include direct-vent gas appliances. Direct-vent draws combustion air from the
outdoors and vents to the outdoors.
4. Compare the maximum Btu/Hr the space can support with the actual amount of Btu/Hr
used.
_________________ Btu/Hr (maximum the space can support)
_________________ Btu/Hr (actual amount of Btu/Hr used)
Example: 46,100 Btu/Hr (maximum the space can support)
50,000 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 support. You must provide additional fresh air.
Your options are as follows:
A. Rework worksheet, adding the space of an adjoining room. If the extra space provides
an unconfined space, remove door to adjoining 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 8.
C. Install a lower Btu/Hr heater, if lower Btu/Hr size makes room unconfined.
If the actual Btu/Hr used is less than the maximum Btu/Hr the space can support, the space
is an unconfined space. You will need no additional fresh air ventilation.

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102921
Figure 2 - Ventilation Air from Inside Building
Continued
Or
Remove
Door into
Adjoining
Room,
Option 3
Ventilation Grills
Into Adjoining Room,
Option 2
12"
12"
Ventilation
Grills
into Adjoining
Room,
Option 1
AIR FOR
COMBUSTION
AND
VENTILATION
Continued
WARNING ICON G 001
WARNING
If the area in which the heater may be operated is smaller than
that defined as an unconfined space, provide adequate combus-
tion and ventilation air by one of the methods described in the
National Fuel Gas Code, ANSI Z223.1, 1992, Section 5.3.
VENTILATION AIR
Ventilation Air From Inside Building
This fresh air would come from an adjoining unconfined space. When ventilating to
anadjoiningunconfinedspace,youmustprovidetwopermanentopenings:onewithin
12"oftheceilingandonewithin12"oftheflooronthewallconnectingthetwospaces
(see options 1 and 2, Figure 2). You can also remove door into adjoining room (see
option 3, Figure 2). Follow the National Fuel Gas Code NFPA 54/ANSI Z223.1,
Section 5.3, Air for Combustion and Ventilation for required size of ventilation grills
or ducts.
WARNING ICON G 001
WARNING
Rework worksheet, adding the space of the adjoining unconfined
space. The combined spaces must have enough fresh air to supply all
appliances in both spaces.

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102921
Figure 3 - Ventilation Air from Outdoors
Outlet
Air Ventilated
Attic
Outlet
Air
Inlet
Air
Inlet Air Ventilated
Crawl Space
To
Crawl
Space
To Attic
AIR FOR
COMBUSTION
AND
VENTILATION
Continued
Ventilation Air From Outdoors
Provide extra fresh air by using ventilation grills or ducts. You must provide two
permanent openings: one within 12" of the ceiling and one within 12" of the floor.
Connect these items directly to the outdoors or spaces open to the outdoors. These
spaces include attics and crawl spaces. Follow the National Fuel Gas Code NFPA
54/ANSI Z223.1, Section 5.3, Air for Combustion and Ventilation for required size
of ventilation grills or ducts.
IMPORTANT: Do not provide openings for inlet or outlet air into attic if attic has
a thermostat-controlled power vent. Heated air entering the attic will activate the
power vent.

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INSTALLINGTO
WALL
Continued
CHECK GAS TYPE
Use only natural gas. If your gas supply is not natural, do not install heater. Call
dealer where you bought heater for proper type heater.
INSTALLATION ITEMS
Before installing heater, make sure you have the items listed below:
• piping (check local codes)
• sealant (resistant to propane/LP gas)
• manual shutoff valve *
• ground joint union
• test gauge connection * (see
Figure 12, page 14)
• sediment trap
• tee joint
• pipe wrench
NOTICE
Aqualifiedservicepersonmustinstallheater.Followalllocalcodes.
*AnA.G.A. design-certified manual shutoff valve with 1/8" NPT tap is an acceptable
alternative to test gauge connection. Purchase the optional A.G.A. design-certified
manual shutoff valve from your dealer. See Accessory, page 28.
LOCATING HEATER
This heater is designed to be mounted on a wall.
WARNING ICON G 001
WARNING
Maintaintheminimumclearancesshown in Figure4 (page 10).If you
can, provide greater clearances from floor, ceiling, and joining wall.
WARNING ICON G 001
CAUTION
If you install the heater in a home garage
• heater pilot and burner must be at least 18 inches above floor
• locate heater where moving vehicle will not hit it
IMPORTANT: Vent-free heaters add moisture to the air. Although this is beneficial, in-
stalling heater in rooms without enough ventilation air may cause mildew to form from
too much moisture. See Air for Combustion and Ventilation, pages 5 through 8.
WARNING ICON G 001
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 in the air
(such as tobacco smoke) exist, may discolor walls.
WARNING ICON G 001
WARNING
Never install the heater
• in a bathroom
• in a recreational vehicle
• where curtains, furniture, clothing, or other flammable objects
are less than 36 inches from the front, top, or sides of the heater
• as a fireplace insert
• in high traffic areas
• in windy or drafty areas

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102921
Figure 5 - Mounting Screw Locations
Mounting
Screw
Locations
8 7/8"
Minimum To
Maintain 6"
Clearance
From Wall
7 3/4"
20 1/4"
Minimum To
Maintain 3"
Clearance
From Floor
FLOOR
JOINING WALL
INSTALLING HEATER TO WALL
Marking Screw Locations
1. Determine where you will locate heater.
2. Mark two mounting screw locations on wall (see Figure 5).
INSTALLINGTO
WALL
Continued
WARNING ICON G 001
WARNING
Maintain minimum clearances shown in Figure 5. If you can,
provide greater clearances from floor and joining wall.
For convenience and efficiency, install heater
• where there is easy access for operation, inspection, and service
• in coldest part of room
Figure 4 - Mounting Clearances As Viewed From Front of Heater
36"
3"
FLOOR
CEILING
Minimum
Minimum To Top Surface
Of Carpeting, Tile Or Other
Combustible Material
6"
Minimum
From
Sides Of
Heater
Right
Side
Left
Side
THERMOSTAT SENSING BULB
The thermostat sensing bulb is located inside the heater. Do not move this bulb
during installation or operation of the heater.

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102921
Installing Two Mounting Screws
Note: Wall anchors and mounting screws are in hardware package. The hardware
package is provided with heater.
Attaching to wall stud method
For attaching mounting screw to wall stud
1. Drill hole at marked location using 9/64" drill bit.
2. Insert mounting screw into wall stud.
3. Tighten screw until 1/16" space (thickness of penny) is between screwhead and
wall.
Attaching to wall anchor method
Follow instructions below to attach mounting screws to hollow walls (wall areas
between studs) or solid walls (concrete or masonry).
1. Drill holes at marked locations using 5/16" drill bit. For solid walls (concrete or
masonry), drill at least 1 1/4" deep.
2. Fold wall anchor (see Figure 6).
Figure 6 - Folding Anchor
3. Insert wall anchor (wings first) into hole. Tap anchor flush to wall.
4. For thin walls (1/2" or less), insert red key into wall anchor. Push red key to
“pop” open anchor wings (see Figure 7). IMPORTANT: Do not hammer key!
For thick walls (over 1/2" thick) or solid walls, do not pop open wings.
Figure 7 - Popping Open Anchor Wings For Thin Walls
Thin Walls
(1/4" to 1/2" thick)
5. Tighten two screws until 1/16" space (thickness of penny) is between
screwheads and wall (see Figure 8).
ANCHOR
Thin or Thick Wall
(thick wall shown)
Solid Wall
1/16" Space
Figure 8 - Tightening Anchors
INSTALLINGTO
WALL
Continued
Continued

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Placing Heater On Mounting Screws
1. Locate two keyhole slots on back panel of heater (see Figure 9).
2. Place large openings of slots over screwheads. Slide heater down until screws
are in small portion of slots.
Figure 11 - Installing Bottom Mounting Screw
Figure 9 - Location Of Keyhole Slots On Back Panel Of Heater
Removing Front Panel Of Heater
1. Remove two screws near bottom corners of front panel.
2. Lift straight up on grill guard until it stops. Grill guard will slide up about 1/4".
3. Pull bottom of front panel forward, then down.
Keyhole Slots
Installing Bottom Mounting Screw
1. Locate bottom mounting hole. This hole is near bottom on back panel of heater
(see Figure 11).
2. Mark screw location on wall.
3. Remove heater from wall.
4. If installing bottom mounting screw into hollow or solid wall, install wall anchor.
Follow steps 1 through 5 under Attaching To Wall Anchor Method, page 11.
If installing bottom mounting screw into wall stud, drill hole at marked location
using 9/64" drill bit.
5. Replace heater on wall.
6. Insert bottom anchor screw through back panel into bottom anchor or drilled
hole (see Figure 11).
7. Tighten screw until heater is firmly secured to wall. Do not over tighten.
Note: Do not replace front panel at this time. Replace front panel after making
gas connections and checking for leaks (see pages 13-15).
Figure 10 - Removing Front Panel Of Heater
INSTALLINGTO
WALL
Continued

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102921
CONNECTING
TO GAS
SUPPLY
NOTICE
A qualified service person must connect heater to gas supply.
Follow all local codes.
IMPORTANT : Check gas line pressure before connecting heater to gas line. Gas line
pressure must be no greater than 14 inches of water. If gas line pressure is higher,
heater regulator damage could occur.
Installation must include a manual shutoff valve, ground joint union, and plugged
1/8" NPT tap. Locate NPT tap within reach for test gauge hook up. NPT tap must
be upstream from heater (see Figure 12, page 14).
Apply pipe joint sealant lightly to male threads. This will prevent excess sealant
from going into pipe. Excess sealant in pipe could result in clogged heater valves.
Install sediment trap (trap) in supply line as shown in Figure 12, page 14. Locate
sediment trap where it is within reach for cleaning. Locate sediment trap 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.
WARNING ICON G 001
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 3/8" diameter or greater to allow proper gas volume to heater.
If pipe is too small, undue loss of pressure will occur.
WARNING ICON G 001
WARNING
Never connect heater to private (non-utility) gas wells. This gas is
commonly known as wellhead gas.
Continued
WARNING ICON G 001
CAUTION
Use pipe joint sealant that is resistant to liquid petroleum (LP) gas.

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102921
IMPORTANT: Hold pressure regulator with wrench when connecting it to gas piping
and/or fittings.
* AnA.G.A. design certified manual shutoff valve with1/8"NPT tap is an acceptable
alternative to test gauge connection. Purchase the optional A.G.A. design certified
manual shutoff valve from your dealer. See Accessory, page 28.
Tee Joint
Reducer
Bushing to
1/8" NPT
1/8" NPT
Plug Tap
Test
Gauge
Connection *
Pressure
Regulator
Tee
Joint
Pipe
Nipple
Cap
Sediment Trap
CHECKING
GAS
CONNECTIONS
Heater
Cabinet
3/8" NPT
Pipe Nipple
Ground Joint Union
Manual
Shutoff
Valve *
From
External
Regulator
(4" W.C. to
10.5" W.C.
Pressure)
Figure 12 - Gas Connection
3" Minimum
CONNECTING
TO GAS
SUPPLY
Continued
WARNING ICON G 001
WARNING
Test all gas piping and connections for leaks after installing or
servicing. Correct all leaks at once.
WARNING ICON G 001
WARNING
Never use an open flame to check for a leak. Apply a mixture of
liquid soap and water to all joints. Bubbles forming show a leak.
Correct all leaks at once.
PRESSURE TESTING GAS SUPPLY PIPING SYSTEM
Test Pressures In Excess Of 1/2 PSIG
1. Disconnect heater and its individual manual shutoff valve from gas supply
piping system. Pressures in excess of 1/2 psig will damage heater regulator.
2. Cap off open end of gas pipe where manual shutoff valve was connected.
3. Pressurize supply piping system by either using compressed air or
opening main gas valve located on or near gas meter.

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102921
4. Check all joints of gas supply piping system. Apply mixture of liquid soap and
water to gas joints. Bubbles forming show a leak.
5. Correct all leaks at once.
Test Pressures Equal To or Less Than 1/2 PSIG
1. Close manual shutoff valve (see Figure 13).
2. Pressurize supply piping system by either using compressed air or opening main
gas valve located on or near gas meter.
3. Check all joints from gas meter to manual shutoff valve (see Figure 14). Apply
mixture of liquid soap and water to gas joints. Bubbles forming show a leak.
4. Correct all leaks at once.
PRESSURE TESTING HEATER GAS CONNECTIONS
1. Open manual shutoff valve (see Figure 13).
2. Open main gas valve located on or near gas meter.
3. Make sure control knob of heater is in the OFF position.
4. Check all joints from manual shutoff valve to control valve (see Figure 14).
Apply mixture of liquid soap and water to gas joints. Bubbles forming show a
leak.
5. Correct all leaks at once.
6. Light heater (see Operating Heater, pages 16 through 18). Check the rest of the
internal joints for leaks.
7. Turn off heater (see To Turn Off Gas To Appliance, page 18).
8. Replace front panel.
ON
POSITION
OFF
POSITION
Figure 13 - Manual Shutoff Valve
Manual
Shutoff
Valve
Open
Closed
Figure 14 - Checking Gas Joints
Control Valve Location
Gas Meter
Manual
Shutoff
Valve
CONNECTING
TO GAS
SUPPLY
Continued

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102921
IGNITOR
PILOT
LO
OFF
HI
OPERATING
HEATER
Control Knob
Figure 15 - Control Knob In The OFF Position
Ignitor Button
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 qualified 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.
LIGHTING INSTRUCTIONS
1. STOP! Read the safety information above.
2. Make sure manual shutoff valve is fully open.
3. Turn control knob clockwise
Clockwise
to the OFF position.
WARNING ICON G 001
WARNING
If you do not follow these instructions exactly, a fire or
explosion may result causing property damage, personal
injury or loss of life.
FOR YOUR SAFETY READ BEFORE LIGHTING

17
102921
OPERATING
HEATER
Continued
Continued
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
at the top of page 16. If you don’t smell gas, go to the next step.
5. Turn control knob counterclockwise
C-clockwise
to the PILOT position. Press
in control knob for five (5) seconds (see Figure 15, page 16).
Note: You may be running this heater for the first time after hooking up
to gas supply. If so, the control knob may need to be pressed in for 30
seconds. This will allow air to bleed from the gas system.
6. With control knob pressed in, push down and release ignitor button. This
will light pilot. The pilot is attached to the front of burner. The pilot can be
seen through the glass panel. If needed, keep pressing ignitor button until
pilot lights.
Note: If pilot does not stay lit, refer to Troubleshooting, pages 21 through
24. Also contact a qualified service person or gas supplier for repairs.
Until repairs are made, light pilot with match. To light pilot with match,
see Manual Lighting Procedure, page 18.
WARNING ICON G 001
CAUTION
Do not try to adjust heating levels by using the manual shutoff valve.
Pilot Burner
Figure 16 - Pilot
Ignitor Electrode
Thermocouple
7. Keep control knob pressed in for 30 seconds after lighting pilot. After 30
seconds, release control knob.
• If control knob does not pop up when released, contact a qualified
service person or gas supplier for repairs.
Note: If pilot goes out, repeat steps 3 through 7. This heater has a safety
interlock system. Wait one (1) minute before lighting pilot again.
8. Turn control knob counterclockwise
C-clockwise
to desired heating level. The
main burner should light. Set control knob to any heat level between HI
and LO.

18
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TO TURN OFF GAS TO APPLIANCE
OPERATING
HEATER
Continued
Shutting Off Heater
1. Turn control knob clockwise
Clockwise
to the OFF position.
2. Turn off all electric power to the appliance if service is to be performed.
Shutting Off Burner Only (pilot stays lit)
1. Turn control knob clockwise
Clockwise
to the PILOT position.
THERMOSTAT CONTROL OPERATION
The thermostatic control used on these models differs from standard thermo-
stats. Standard thermostats simply turn on and off the burner. The thermostat
used on this heater senses the room temperature. The thermostat adjusts the
amount of gas flow to the burner. This increases or decreases the burner flame
height. At times the room may exceed the set temperature. If so, the burner
will shut off. The burner will cycle back on when room temperature drops
below the set temperature. The control knob can be set to any heat level
between HI and LO.
Note: The thermostat sensing bulb measures the temperature of air near the
heater cabinet. This may not always agree with room temperature (depending
on housing construction, installation location, room size, open air tempera-
tures, etc.). Frequent use of your heater will let you determine your own
comfort levels.
MANUAL LIGHTING PROCEDURE
1. Remove front panel (see Figure 10, page 12).
2. Follow steps 1 through 5 under Lighting Instructions, pages 16 and 17.
3. With control knob pressed in, strike match. Hold match to pilot until pilot
lights.
4. Keep control knob pressed in for 30 seconds after lighting pilot. After 30
seconds, release control knob.
5. Replace front panel.

19
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INSPECTING
BURNER
Check pilot flame pattern and burner flame pattern often.
PILOT FLAME PATTERN
Figure 17 shows a correct pilot flame pattern. Figure 18 shows an incorrect pilot
flame pattern. The incorrect pilot flame is not touching the thermocouple. This will
cause the thermocouple to cool. When the thermocouple cools, the heater will shut
down.
If pilot flame pattern is incorrect, as shown in Figure 18
• turn heater off (see To Turn Off Gas to Appliance, above)
• see Troubleshooting, pages 21 through 24
Thermocouple
GRH/OV 009GOOD PILOT
Thermocouple
Pilot Burner
GRH/OV 008BAD PILOT/LP
Pilot Burner
Figure 17 - Correct Pilot Flame Pattern
Figure 18 - Incorrect Pilot Flame Pattern

20
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1/2 GLASS HEIGHT
INCORRECT FLAME PATTERN
AT HIGH POSITION
BURNER FLAME PATTERN
Figure 19 shows a correct burner flame pattern. Figure 20 shows an incorrect
burner flame pattern. The incorrect burner flame pattern shows yellow tipping of
the flame. It also shows the flame higher than 1/2 the glass panel height.
If burner flame pattern is incorrect, as shown in Figure 20
• turn heater off (see To Turn Off Gas to Appliance, page 18)
• see Troubleshooting, pages 21 through 24
INSPECTING
BURNER
Continued
WARNING ICON G 001
WARNING
If yellow tipping occurs, your heater could produce increased
levels of carbon monoxide. If burner flame pattern shows yellow
tipping, follow instructions at bottom of this page.
NOTICE
Do not mistake orange flames with yellow tipping. Dust or other
fine particles enter the heater and burn causing brief patches of
orange flame.
Figure 19 - Correct Burner Flame Pattern
Figure 20 - Incorrect Burner Flame Pattern
Yellow
Tipping
CORRECT FLAME PATTERN
AT HIGH POSITION
1/2 GLASS HEIGHT