Desa Water Heater CGN10T User Manual

VENT-FREE NATURAL GAS HEATER  
OWNER’S OPERATION AND INSTALLATION MANUAL  
®
Model: CGN10T  
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.  
This appliance may be installed in an aftermarket* 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.  
Save this manual for future reference.  
 
SAFETY  
WARNINGS Continued  
WARNING ICON  
G
001  
INFORMATION  
WARNING: Any change to this heater or its controls can be dangerous.  
Continued  
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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Ignitor Button  
PRODUCT  
Control Knob  
IDENTIFICATION  
Grill  
Guard  
Glass  
Panel  
Heater  
Cabinet  
Front  
Panel  
Figure 1 - Vent-Free Natural Gas Heater  
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*.  
LOCAL CODES  
*Available from:  
American National Standards Institute, Inc.  
1430 Broadway  
New York, NY 10018  
National Fire Protection Association, Inc.  
Batterymarch Park  
Quincy, MA 02269  
1. Remove heater from carton.  
UNPACKING  
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.  
Safety Device  
PRODUCT  
FEATURES  
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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AIR FOR  
COMBUSTION  
AND  
WARNING  
WARNING ICON  
G
001  
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.  
VENTILATION  
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.  
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.  
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.  
Continued  
5
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DETERMINING AIR FLOW FOR HEATER LOCATION  
AIR FOR  
COMBUSTION  
AND  
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.  
VENTILATION  
1. Determine the volume of the space (length x width x height).  
Continued  
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: 2304 cu. ft. (volume of space) ÷ 50 cu. ft. = 46.1 or 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  
Gas water heater*  
Gas furnace  
Vented gas heater  
Gas fireplace logs  
Other gas appliances*  
Total  
___________________ Btu/Hr  
___________________ Btu/Hr  
___________________ Btu/Hr  
___________________ Btu/Hr  
___________________ Btu/Hr  
+ ___________________ Btu/Hr  
= ___________________ Btu/Hr  
Example: Gas water heater  
Vent-free heater  
Total  
40,000  
10,000  
50,000  
Btu/Hr  
Btu/Hr  
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.  
6
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AIR FOR  
COMBUSTION  
AND  
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  
Continued  
VENTILATION AIR  
Ventilation Air From Inside Building  
This fresh air would come from an adjoining unconfined space. When ventilating to  
an adjoining unconfined space, you must provide two permanent openings: one within  
12" of the ceiling and one within 12" of the floor on the wall connecting the two spaces  
(see options 1 and 2, Figure 2). You can also remove door into adjoining room (see  
option 3, Figure 2). Follow the National Fuel Gas Code NFPA 54/ANSI Z223.1,  
Section 5.3, Air for Combustion and Ventilation for required size of ventilation grills  
or ducts.  
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.  
12"  
Ventilation Grills  
Into Adjoining Room,  
Ventilation  
Grills  
Option 2  
Or  
into Adjoining  
Room,  
Remove  
Door into  
Adjoining  
Room,  
Option 1  
Option 3  
12"  
Figure 2 - Ventilation Air from Inside Building  
Continued  
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Ventilation Air From Outdoors  
AIR FOR  
COMBUSTION  
AND  
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.  
VENTILATION  
Continued  
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.  
Ventilated  
Outlet  
Attic  
Air  
Outlet  
Air  
To Attic  
To  
Crawl  
Space  
Inlet  
Air  
Ventilated  
Inlet Air  
Crawl Space  
Figure 3 - Ventilation Air from Outdoors  
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INSTALLINGTO  
WALL  
NOTICE  
Aqualifiedservicepersonmustinstallheater. Followalllocalcodes.  
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  
* An A.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  
WARNING ICON  
G
001  
Maintain the minimum clearances shown in Figure 4 (page 10). If you  
can, provide greater clearances from floor, ceiling, and joining wall.  
WARNING  
WARNING ICON  
G
001  
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  
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.  
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.  
CAUTION  
WARNING ICON  
G
001  
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  
Continued  
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For convenience and efficiency, install heater  
INSTALLINGTO  
• where there is easy access for operation, inspection, and service  
WALL  
Continued  
• in coldest part of room  
CEILING  
36"  
Minimum  
6"  
Minimum  
From  
Sides Of  
Heater  
Right  
Side  
Left  
Side  
3"  
Minimum To Top Surface  
Of Carpeting, Tile Or Other  
Combustible Material  
FLOOR  
Figure 4 - Mounting Clearances As Viewed From Front of Heater  
THERMOSTAT SENSING BULB  
The thermostat sensing bulb is located inside the heater. Do not move this bulb  
during installation or operation of the heater.  
INSTALLING HEATER TO WALL  
Marking Screw Locations  
1. Determine where you will locate heater.  
WARNING  
WARNING ICON  
G
001  
Maintain minimum clearances shown in Figure 5. If you can,  
provide greater clearances from floor and joining wall.  
2. Mark two mounting screw locations on wall (see Figure 5).  
8 7/8"  
7 3/4"  
Minimum To  
Maintain 6"  
Clearance  
From Wall  
Mounting  
Screw  
Locations  
20 1/4"  
Minimum To  
Maintain 3"  
Clearance  
From Floor  
FLOOR  
Figure 5 - Mounting Screw Locations  
10  
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Installing Two Mounting Screws  
Note: Wall anchors and mounting screws are in hardware package. The hardware  
package is provided with heater.  
INSTALLINGTO  
WALL  
Continued  
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.  
Thin Walls  
(1/4" to 1/2" thick)  
Figure 7 - Popping Open Anchor Wings For Thin Walls  
5. Tighten two screws until 1/16" space (thickness of penny) is between  
screwheads and wall (see Figure 8).  
Thin or Thick Wall  
(thick wall shown)  
1/16" Space  
Solid Wall  
ANCHOR  
Figure 8 - Tightening Anchors  
Continued  
11  
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Placing Heater On Mounting Screws  
INSTALLINGTO  
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.  
WALL  
Continued  
Keyhole Slots  
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.  
Figure 10 - Removing Front Panel Of Heater  
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 11 - Installing Bottom Mounting Screw  
12  
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CONNECTING  
TO GAS  
NOTICE  
A qualified service person must connect heater to gas supply.  
Follow all local codes.  
SUPPLY  
WARNING  
WARNING ICON  
G
001  
Never connect heater to private (non-utility) gas wells. This gas is  
commonly known as wellhead gas.  
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.  
CAUTION  
WARNING ICON  
G
001  
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.  
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.  
CAUTION  
WARNING ICON  
G
001  
Use pipe joint sealant that is resistant to liquid petroleum (LP) gas.  
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.  
Continued  
13  
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IMPORTANT: Hold pressure regulator with wrench when connecting it to gas piping  
and/or fittings.  
CONNECTING  
TO GAS  
SUPPLY  
Continued  
Pressure  
Regulator  
3/8" NPT  
Pipe Nipple  
Heater  
Cabinet  
Ground Joint Union  
Tee Joint  
Manual  
Shutoff  
Valve *  
Reducer  
Bushing to  
1/8" NPT  
Test  
Gauge  
Connection *  
From  
External  
Regulator  
(4" W.C. to  
10.5" W.C.  
Pressure)  
1/8" NPT  
Plug Tap  
Tee  
Joint  
3" Minimum  
Sediment Trap  
Pipe  
Nipple  
Cap  
Figure 12 - Gas Connection  
* An A.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.  
CHECKING  
GAS  
CONNECTIONS  
WARNING  
WARNING ICON  
G
001  
Test all gas piping and connections for leaks after installing or  
servicing. Correct all leaks at once.  
WARNING  
WARNING ICON  
G
001  
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.  
14  
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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.  
CONNECTING  
TO GAS  
SUPPLY  
Test Pressures Equal To or Less Than 1/2 PSIG  
1. Close manual shutoff valve (see Figure 13).  
Continued  
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.  
Open  
P
Manual  
Shutoff  
Valve  
Closed  
Figure 13 - Manual Shutoff Valve  
Control Valve Location  
Gas Meter  
Manual  
Shutoff  
Valve  
Figure 14 - Checking Gas Joints  
15  
102921  
 
OPERATING  
HEATER  
FOR YOUR SAFETY READ BEFORE LIGHTING  
WARNING  
If you do not follow these instructions exactly, a fire or  
explosion may result causing property damage, personal  
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 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  
to the OFF position.  
Clockwise  
Control Knob  
Ignitor Button  
LO  
P I L O T  
O F F  
H I  
IGNITOR  
Figure 15 - Control Knob In The OFF Position  
16  
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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.  
OPERATING  
HEATER  
Continued  
C-clockwise  
5. Turn control knob counterclockwise  
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.  
Ignitor Electrode  
Pilot Burner  
Thermocouple  
Figure 16 - Pilot  
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.  
C-clockwise  
8. Turn control knob counterclockwise  
to desired heating level. The  
main burner should light. Set control knob to any heat level between HI  
and LO.  
CAUTION  
Do not try to adjust heating levels by using the manual shutoff valve.  
Continued  
17  
102921  
 
OPERATING  
TO TURN OFF GAS TO APPLIANCE  
HEATER  
Continued  
Shutting Off Heater  
1. Turn control knob clockwise  
to the OFF position.  
Clockwise  
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  
to the PILOT position.  
Clockwise  
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.  
18  
102921  
 
Check pilot flame pattern and burner flame pattern often.  
INSPECTING  
BURNER  
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.  
Pilot Burner  
Thermocouple  
GOOD PILOT  
GRH/OV 009  
Figure 17 - Correct Pilot Flame Pattern  
Pilot Burner  
Thermocouple  
BAD PILOT/LP  
GRH/OV 008  
Figure 18 - Incorrect Pilot Flame Pattern  
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  
19  
102921  
 
BURNER FLAME PATTERN  
INSPECTING  
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.  
BURNER  
Continued  
WARNING  
WARNING ICON  
G
001  
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.  
1/2 GLASS HEIGHT  
CORRECT FLAME PATTERN  
AT HIGH POSITION  
Figure 19 - Correct Burner Flame Pattern  
Yellow  
Tipping  
1/2 GLASS HEIGHT  
INCORRECT FLAME PATTERN  
AT HIGH POSITION  
Figure 20 - Incorrect Burner Flame Pattern  
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  
20  
102921  
 
CLEANING  
AND  
WARNING  
WARNING ICON  
G
001  
Turn off heater and let cool before cleaning.  
MAINTENANCE  
CAUTION  
WARNING ICON  
G
001  
You must keep control areas, burner, and circulating air  
passageways of heater clean. Inspect these areas of heater before  
each use. Have heater inspected yearly by a qualified service  
person. Heater may need more frequent cleaning due to excessive  
lint from carpeting, bedding material, etc.  
ODS/PILOT AND BURNER ORIFICE  
• Use a vacuum cleaner, pressurized air, or small, soft bristled brush to clean.  
CABINET  
Air Passageways  
• Use a vacuum cleaner or pressurized air to clean.  
Exterior  
• Use a soft cloth dampened with a mild soap and water mixture. Wipe the  
cabinet to remove dust.  
TROUBLE-  
SHOOTING  
WARNING  
WARNING ICON  
G
001  
Turn off heater and let cool before servicing. Only a qualified  
service person should service and repair heater.  
Note: All troubleshooting  
items are listed in order of  
operation.  
CAUTION  
WARNING ICON  
G
001  
Never use a wire, needle, or similar object to clean ODS/pilot. This  
can damage ODS/pilot unit.  
POSSIBLE  
CAUSE  
OBSERVED  
PROBLEM  
REMEDY  
1. Ignitor cable pinched or  
wet  
1. Free ignitor cable if  
pinched by any metal or  
tubing. Keep ignitor  
cable dry  
When ignitor button  
is pressed, there is no  
spark at ODS/pilot  
2. Ignitor electrode not  
connected to ignitor  
cable  
2. Reconnect ignitor cable  
3. Piezo ignitor nut is loose 3. Tighten nut holding  
piezo ignitor to heater  
cabinet. Nut is located  
inside heater cabinet at  
top  
4. Broken ignitor cable  
5. Ignitor electrode broken  
6. Bad piezo ignitor  
7. Ignitor electrode posi-  
tioned wrong  
4. Replace ignitor cable  
5. Replace ignitor  
6. Replace piezo ignitor  
7. Replace ignitor  
21  
102921  
 
POSSIBLE  
CAUSE  
OBSERVED  
PROBLEM  
TROUBLE-  
REMEDY  
SHOOTING  
1. Turn on gas supply or  
open manual shutoff  
valve  
2. Turn control knob to  
PILOT position  
1. Gas supply turned off  
or manual shutoff  
valve closed  
2. Control knob not in  
PILOT position  
When ignitor button  
is pressed, there is  
spark at ODS/pilot  
but no ignition  
Continued  
3. Press in control knob  
while in PILOT  
3. Control knob not  
pressed in while in  
PILOT position  
position  
4. Continue holding down  
control knob. Repeat  
igniting operation until  
air is removed  
4. Air in gas lines when  
installed  
5. Clean ODS/pilot (see  
Cleaning and Mainte-  
nance, page 21) or  
replace ODS/pilot  
assembly  
5. ODS/pilot is clogged  
6. Replace gas regulator  
6. Gas regulator setting is  
not correct  
1. Press in control knob  
fully  
1. Control knob not fully  
pressed in  
2. Control knob not  
pressed in long enough  
ODS/pilot lights but  
flame goes out when  
control knob is  
released  
2. After ODS/pilot lights,  
keep control knob  
pressed in 30 seconds  
3. Wait one minute for  
safety interlock system  
to reset. Repeat  
3. Safety interlock system  
has been triggered  
ignition operation.  
4. Fully open manual  
shut-off valve  
4. Manual shutoff valve  
not fully open  
5. Hand tighten until  
snug, then tighten 1/4  
turn more  
5. Thermocouple connec-  
tion loose at control  
valve  
6. A) Contact local  
natural gas company  
6. Pilot flame not touch-  
ing thermocouple,  
which allows thermo-  
couple to cool, causing  
pilot flame to go out.  
This problem could be  
caused by one or both  
of the following:  
B) Clean ODS/pilot  
(see Cleaning and  
Maintenance, page 21)  
or replace ODS/pilot  
assembly  
A) Low gas pressure  
B) Dirty or partially  
clogged ODS/pilot  
7. Thermocouple dam-  
aged  
7. Replace thermocouple  
8. Replace control valve  
8. Control valve damaged  
22  
102921  
 
OBSERVED  
PROBLEM  
POSSIBLE  
CAUSE  
TROUBLE-  
REMEDY  
SHOOTING  
Burner does not light  
after ODS/pilot is lit  
1. Burner orifice is  
clogged  
1. Clean burner orifice (see  
Cleaning and Mainte-  
nance, page 21) or  
Continued  
replace burner orifice  
2. Burner orifice diameter 2. Replace burner orifice  
is too small  
3. Inlet gas pressure is  
too low  
3. Contact local natural gas  
company  
Delayed ignition of  
burner  
1. Manifold pressure is  
too low  
1. Contact local natural gas  
company  
2. Burner orifice is  
clogged  
2. Clean burner orifice (see  
Cleaning and Mainte-  
nance, page 21) or  
replace burner orifice  
Burner backfiring  
during combustion  
1. Burner orifice is  
clogged or damaged  
1. Clean burner orifice (see  
Cleaning and Mainte-  
nance, page 21) or  
replace burner orifice  
2. Contact local natural gas  
company  
2. Inlet gas pressure is  
too low  
3. Burner damaged  
4. Gas regulator defective  
3. Replace burner  
4. Replace gas regulator  
Yellow flame during  
burner combustion  
1. Not enough air  
1. Check burner for dirt  
and debris. If found,  
clean burner (see  
Cleaning and Mainte-  
nance, page 21)  
2. Inlet gas pressure is  
too low  
2. Contact local natural gas  
company  
3. Gas regulator defective  
3. Replace gas regulator  
Slight smoke or odor  
during initial operation  
1. Residues from manu-  
facturing processes  
1. Problem will stop after a  
few hours of operation  
Heater produces a  
whistling noise when  
burner is lit  
1. Turning control knob  
to HI position when  
burner is cold  
1. Turn control knob to LO  
position and let warm up  
for a minute  
2. Air in gas line  
2. Operate burner until air  
is removed from line.  
Have gas checked by  
local natural gas company  
3. Observe minimum  
installation clearances  
(see Figure 4, page 10)  
4. Clean burner (see  
Cleaning and Mainte-  
nance, page 21) or  
3. Air passageways on  
heater blocked  
4. Dirty or partially  
clogged burner orifice  
replace burner orifice  
Continued  
23  
102921  
 
TROUBLE-  
WARNING  
WARNING ICON  
G
001  
If you smell gas  
SHOOTING  
• Shut off gas supply.  
Continued  
• 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.  
IMPORTANT: Operating heater where impurities in air exist may create odors.  
Cleaning supplies, paint, paint remover, cigarette smoke, cements and glues, new  
carpet or textiles, etc., create fumes. These fumes may mix with combustion air and  
create odors.  
OBSERVED  
PROBLEM  
POSSIBLE  
CAUSE  
REMEDY  
1. This is common with  
most heaters. If noise is  
excessive, contact  
Heater produces a  
clicking/ticking noise  
just after burner is lit  
or shut off  
1. Metal expanding while  
heating or contracting  
while cooling  
qualified service person  
1. Ventilate room. Stop  
using odor-causing  
Heater produces  
unwanted odors  
1. Heater burning vapors  
from paint, hair spray,  
glues, etc. See IMPOR-  
TANT statement above.  
2. Gas leak. See Warn-  
ing statement at  
products while heater is  
running  
2. Locate and correct all  
leaks (see Checking Gas  
Connections, page 14)  
top of page  
1. Open window and/or  
door for ventilation  
2. Contact local natural  
gas company  
Heater shuts off in  
use (ODS operates)  
1. Not enough fresh air is  
available  
2. Low line pressure  
3. Clean ODS/pilot (see  
Cleaning and Mainte-  
nance, page 21)  
3. ODS/pilot is partially  
clogged  
1. Locate and correct all  
leaks (see Checking Gas  
Connections, page 14)  
2. Replace control valve  
Gas odor even when  
control knob is in  
OFF position  
1. Gas leak. See Warn-  
ing statement at  
top of page  
2. Control valve defective  
1. Take apart gas tubing  
and remove foreign  
matter  
Gas odor during  
combustion  
1. Foreign matter be-  
tween control valve  
and burner  
2. Locate and correct all  
leaks (see Checking Gas  
Connections, page 14)  
2. Gas leak. See Warn-  
ing statement at  
top of page  
1. Refer to Air for Com-  
bustion and Venti-  
lation requirements  
(page 5)  
Moisture/condensation  
noticed on windows  
1. Not enough combus-  
tion/ventilation air  
24  
102921  
 
You may have further questions about installation, operation, or troubleshooting.  
If so, contact DESA International’s Technical Service Department at 1-800-323-  
5190.  
TECHNICAL  
SERVICE  
CGN10T  
SPECIFICATIONS  
Btu (Variable)  
Type Gas  
Ignition  
5,000/10,000  
Natural Only  
Piezo  
Pressure Regulator Setting  
Inlet Gas Pressure (inches of water)  
Maximum  
3" W.C.  
10.5"  
4"  
Minimum  
Dimensions, Inches (H x W x D)  
Heater (Including knobs and grill) 21 1/2 x 13 1/2 x 7  
Carton  
Weight (pounds)  
Shipping  
25 1/4 x 16 3/4 x 7 1/2  
19  
When gas pressure is too low  
• pilot will not stay lit  
• burner will have delayed ignition  
• heater will not produce specified heat  
When gas quality is bad  
SERVICE  
HINTS  
• pilot will not stay lit  
• burner will produce flames and soot  
• heater will backfire when lit  
You may feel your gas pressure is too low or gas quality is bad. If so, contact your  
local natural gas supplier.  
25  
102921  
 
ILLUSTRATED PARTS BREAKDOWN  
CGN10T  
26  
102921  
 
This list contains replaceable parts used in your heater. When ordering parts, follow  
the instructions listed under Replacement Parts on page 25 of this manual.  
PARTS LIST  
CGN10T  
KEY PART  
NO.  
NUMBER  
DESCRIPTION  
QTY.  
1
2
3
4
5
6
7
8
098304-01  
099467-02  
099318-04  
101108-01  
102018-01AA Bottom Glass Retainer  
098260-03 Glass Panel  
098532-03AA Top Glass Retainer  
M11084-38 Screw, #8 x 3/8"  
098352-03BR Deflector Unit  
Screw, #10 x 3/8"  
Front Panel Assembly  
Grill Guard  
2
1
1
2
1
1
1
8
1
1
2
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
2
1
2
Grill Guard Clip  
9
10  
11  
12  
098271-03  
098249-01  
100701-03  
Ignitor Cable  
Nut, M5  
ODS/Pilot Assembly  
Thermocouple  
Ignitor Electrode  
Burner  
12-1 098514-01  
12-2 098594-01  
13  
099386-02  
099387-11  
098251-03  
099463-01  
099415-01  
102863-01  
102864-01  
102492-01  
102493-01  
098522-07  
102571-01  
102445-01  
098275-01  
099553-01  
098303-02  
14  
15  
16  
17  
18  
19  
20  
21  
22  
23  
24  
25  
26  
27  
Pilot Tubing  
Injector  
Injector Holder  
Pressure Regulator  
Burner Tubing  
Regulator Tubing  
5/16" Male Connector  
1/4" Male Connector  
Thermostat Gas Valve  
Cabinet Assembly  
Piezo Ignitor  
3/8" NPT Male Plug  
Pilot Shield  
Screw, #6 x 5/16"  
PARTS AVAILABLE - NOT SHOWN  
102471-01  
100642-02  
Control Position Label  
Assembly, Hardware  
1
1
12-1  
12-2  
ODS/PILOT  
27  
102921  
 
Note: Use only original replacement parts. This will protect your warranty coverage  
for parts replaced under warranty.  
REPLACEMENT  
PARTS  
Parts Under Warranty  
Contact authorized dealer from whom you purchased this product. If they cannot  
supply original replacement part(s), call DESA International’s Technical Service  
Department at 1-800-323-5190 for referral information.  
When contacting your dealer or DESA International, have ready:  
• your name  
• your address  
• model number of your heater  
• how heater was malfunctioning  
• type of gas used (propane or natural gas)  
• purchase date  
Usually, we will ask you to return the defective part to the factory.  
Parts Not Under Warranty  
Contact authorized dealers of this product. If they cannot supply original replace-  
ment part(s), call DESA International’s Parts Department at 1-800-972-7879 for  
information.  
When calling DESA International, have ready:  
• model number of your heater  
• the replacement part number  
You can purchase a service manual from the address listed on the back page of this  
manual. Send a check for $5.00 payable to DESA International.  
SERVICE  
PUBLICATIONS  
Purchase this heater accessory from your local dealer. If they cannot supply this  
accessory, call DESA International’s Parts Department at 1-800-972-7879 for  
information. You can also write to the address listed on the back page of this  
manual.  
ACCESSORY  
MANUAL SHUTOFF  
VALVE - GA5010  
Manual shutoff valve with 1/8"  
NPT tap.  
28  
102921  
 
These Parts Centrals are privately-owned businesses. They have agreed to support  
our customer’s needs by providing original replacement parts and accessories.  
PARTS  
CENTRAL  
Baltimore Electric  
1348 Dixwell Avenue  
Hamden, CT 06514  
1-800-397-7553  
Dayton Hardware  
P.O. Box 275  
North Dayton Station  
Dayton, OH 45404  
All States  
Washer Equipment Co.  
1715 Main Street  
Kansas City, MO 64108  
KS, MO, AR  
203-248-7553  
816-842-3911  
Parts Department  
513-258-3721  
Parts Department  
OH 1-800-762-3426  
Parts Department  
Portable Heater Parts  
342 N. County Rd. 400 E.  
Valparaiso, IN 46383  
All States  
219-462-7441  
1-800-362-6951  
East Coast Energy  
Products  
707 Broadway  
W. Long Branch, NJ  
07764  
908-870-8809  
1-800-755-8809  
Parts Department  
Halco Enterprises  
208 Carter Drive, Unit 21  
West Chester, PA 19382  
610-430-7717  
1-800-368-0803  
Parts Department  
Parts Department  
FBD  
P.O. Box 1096  
1720 Kummer Road  
Franklin, KY 42134  
502-586-1922  
1-800-654-8534  
LaPorte’s Parts and Service  
2444 North 5th Street  
Hartsville, SC 29550  
803-332-0191  
Tarantin Tank Co.  
P.O. Box 6129  
Freehold, NJ 07728  
908-780-9340  
1-800-922-0724  
Parts Department  
Parts Department  
Four Flags Power  
Products  
1115 Stateline Road  
Niles, MI 49120  
616-684-2697  
Parts Only  
Cans Unlimited, Inc.  
P.O. Box 645  
Taylor, SC 29687  
All States  
803-879-3009  
1-800-845-5301  
Parts Department  
Albany Ladder  
1586-90 Central Avenue  
Albany, NY 07728  
NY, MA, VT  
518-869-5335  
1-800-354-7368  
(NY, MA, VT)  
Master Parts Distributor  
1184 Wilson Ave. NW  
Grand Rapids , MI 49504  
616-791-0505  
Parts Department  
1-800-446-1446  
Fax: 1-616-791-8270  
Parts Department  
29  
102921  
 
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NOTES  
30  
102921  
 
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NOTES  
31  
102921  
 
WARRANTY INFORMATION  
KEEP THIS WARRANTY  
Model  
Serial No.  
Date Purchased  
Always specify model and serial numbers when communicating with the factory.  
We reserve the right to amend these specifications at any time without notice. The only warranty applicable is our  
standard written warranty. We make no other warranty, expressed or implied.  
LIMITED WARRANTY  
COMFORT GLOW VENT-FREE RESIDENTIAL GAS HEATERS  
DESA International warrants this product to be free from defects in materials and components for one (1) year from the  
date of first purchase, provided that the product has been properly installed, operated and maintained in accordance with  
all applicable instructions. To make a claim under this warranty the Bill of Sale or cancelled check must be presented.  
This warranty is extended only to the original retail purchaser. This warranty covers the cost of part(s) required to restore  
thisheatertoproperoperatingconditionandanallowanceforlaborwhenprovidedbyaDESAAuthorizedServiceCenter.  
Warranty part(s) MUST be obtained through authorized dealers of this product and/or DESA International who will  
provide original factory replacement parts. Failure to use original factory replacement parts voids this warranty. The  
heater MUST be installed by a qualified installer in accordance with all local codes and instructions furnished with the  
unit.  
This warranty does not apply to parts that are not in original condition because of normal wear and tear, or parts that fail  
orbecomedamagedasaresultofmisuse,accidents,lackofpropermaintenanceordefectscausedbyimproperinstallation.  
Travel, diagnostic cost, labor, transportation and any and all such other costs related to repairing a defective heater will  
be the responsibility of the owner.  
TO THE FULL EXTENT ALLOWED BY THE LAW OF THE JURISDICTION THAT GOVERNS THE SALE OF  
THE PRODUCT; THIS EXPRESS WARRANTY EXCLUDES ANY AND ALL OTHER EXPRESSED WARRAN-  
TIES ANDLIMITSTHEDURATIONOFANYANDALLIMPLIEDWARRANTIES,INCLUDINGWARRANTIES  
OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE TO ONE (1) YEAR ON ALL  
COMPONENTS FROM THE DATE OF FIRST PURCHASE; AND DESA INTERNATIONAL’S LIABILITY IS  
HEREBY LIMITED TO THE PURCHASE PRICE OF THE PRODUCT AND DESA INTERNATIONAL SHALL  
NOT BE LIABLE FOR ANY OTHER DAMAGES WHATSOEVER INCLUDING INDIRECT, INCIDENTAL OR  
CONSEQUENTIAL DAMAGES.  
Some states do not allow a limitation on how long an implied warranty lasts or an exclusion or limitation of incidental  
or consequential damages, so the above limitation on implied warranties, or exclusion or limitation on damages may not  
apply to you.  
This warranty gives you specific legal rights, and you may also have other rights that vary from state to state.  
For information about this warranty write:  
2701 Industrial Drive  
P.O. Box 90004  
102921-01  
Bowling Green, KY 42102-9004  
REV. A  
4/96  
 

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