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BLUE FLAME VENT-FREE NATURAL GAS HEATER
OWNER'S OPERATION AND INSTALLATION MANUAL
CGN20TA
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.
• 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 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.
104190
Heater Size: 20,000 Btu/Hr Thermostat
Save this manual for future reference.
OWNER'S MANUAL
WARNING: This is an
unvented gas-fired heater. It
uses air (oxygen) from the
room in which it is installed.
Provisions for adequate
combustion must be pro-
vided. Refer to page 4 of this
manual
1
®
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Summary of Contents for Desa Comfort Glow CGN20TA
- Page 1 BLUE FLAME VENT-FREE NATURAL GAS HEATER OWNER’S OPERATION AND INSTALLATION MANUAL CGN20TA Heater Size: 20,000 Btu/Hr Thermostat 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.
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Page 2: Safety Information
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. CGN20TA WARNING: Any change to this heater or its controls can be dan- gerous. This appliance is only for use with the type of gas indicated on the rating plate. -
Page 3: Product Identification
PRODUCT IDENTIFICATION Front Panel Figure 1 - Vent-Free Natural Gas Heater 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, also known as NFPA 54*. -
Page 4: Fresh Air For Combustion And Ventilation
You must provide ad- equate fresh air for these appliances. This will insure proper venting of vented fuel- burning appliances. CGN20TA 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. - Page 5 3. Add the Btu/Hr of all fuel burning ap- pliances 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...
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Page 6: Ventilation Air
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. CGN20TA Ventilation Grills into Adjoining Remove... -
Page 7: Check Gas Type
INSTALLATION NOTICE: A qualified service per- son must install heater. Follow all local codes. CHECK GAS TYPE Use only natural gas. If your gas supply is not natural gas, do not install heater. Call dealer where you bought heater for proper type heater. - Page 8 Thermostat Sensing Bulb Clamp Figure 5 - Attaching Thermostat Sensing Bulb CGN20TA INSTALLING HEATER TO WALL Mounting Bracket The mounting bracket is located on back panel of heater. It has been taped there for shipping. Remove mounting bracket from back panel.
- Page 9 INSTALLATION Continued Attaching Mounting Bracket To Wall Note: Wall anchors, mounting screws, and spacers are in hardware package. The hard- ware package is provided with heater. Attaching to wall stud method For attaching mounting bracket to wall studs 1. Drill holes at marked locations using 9/64"...
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Page 10: Connecting To Gas Supply
* 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 Accessories, page 19. CGN20TA CAUTION: Use only new, black iron or steel pipe. Inter- nally-tinned copper tubing may be used in certain areas. -
Page 11: Checking Gas Connections
CHECKING GAS CONNECTIONS WARNING: Test all gas pip- ing and connections for leaks after installation or servicing. Correct all leaks at once. WARNING: Never use an open flame to check for a leak. Apply a mixture of liquid soap and water to all joints. -
Page 12: Operating Heater
CGN20TA LIGHTING INSTRUCTIONS STOP! Read the safety information above. Make sure manual shutoff valve is fully open. -
Page 13: Inspecting Burner
OPERATING HEATER Continued 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 tem- perature. The thermostat adjusts the amount of gas flow to the burner. -
Page 14: Troubleshooting
When ignitor button is pressed, there is spark at ODS/pilot but no ignition ODS/pilot lights but flame goes out when control knob is released CGN20TA WARNING: Turn off and un- plug heater and let cool before servicing. Only a qualified ser- vice person should service and repair heater. - Page 15 TROUBLESHOOTING Continued OBSERVED PROBLEM Burner does not light after ODS/pilot is lit Delayed ignition of burner Burner backfiring during combustion Yellow flame during burner combustion Slight smoke or odor during initial opera- tion Heater produces a whistling noise when burner is lit 104190 OWNER’S MANUAL POSSIBLE CAUSE...
- Page 16 Heater shuts off in use (ODS operates) Gas odor even when control knob is in OFF position Gas odor during combustion Moisture/condensation noticed on windows CGN20TA POSSIBLE CAUSE 1. Metal expanding while heating or con- tracting while cooling 1. Heater burning vapors from paint, hair spray, glues, etc.
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Page 17: Specifications
Central (see below) or call DESA International’s Parts Department at 1-800- 972-7879 for referral information. When calling DESA International, have ready • model number of your heater • the replacement part number CGN20TA 10,000/20,000 Natural Only Piezo 3" W.C. 10.5" 4"... -
Page 18: Parts Centrals
Master Service Center 1184 Wilson NW Walker, MI 49504 616-791-4760 1-800-446-1446 CGN20TA These Parts Centrals are privately owned businesses. They have agreed to support our customer’s needs by providing original replacement parts and accessories. Washer Equipment Co. 1715 Main Street... - Page 19 ACCESSORIES Purchase these heater accessories from your local dealer. If they can not supply these accessories, either contact your nearest Parts Central (see page 18) or call DESA International’s Parts Department at 1-800- 972-7879 for referral information. You can also write to the address listed on the back page of this manual.
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Page 20: Illustrated Parts Breakdown
Blue Flame Vent-Free Natural Gas Heater ILLUSTRATED PARTS BREAKDOWN CGN20TA CGN20TA 12 ODS/Pilot Assembly 12-1 12-2 104190... -
Page 21: Parts List
Replacement Parts on page 17 of this manual. CGN20TA 12-1 12-2 104190 PART NUMBER DESCRIPTION 098304-01 Screw, #10 x 3/8" 098742-03 Front Panel for CGN20TA (Champagne) 103476-01 Grill Guard 101108-01 Removable Speed Clip 098533-04AA Bottom Glass Retainer 098260-09 Glass Panel 098532-04AA Top Glass Retainer M11084-26 Screw, #10 x 3/8"... - Page 22 Blue Flame Vent-Free Natural Gas Heater NOTES _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ CGN20TA 104190...
- Page 23 OWNER’S MANUAL NOTES _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ 104190...
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Page 24: Warranty Information
WARRANTY INFORMATION 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. COMFORT GLOW VENT-FREE NATURAL GAS HEATERS DESA International warrants this product to be free from defects in materials and components for two (2) years from the date of first purchase, provided that the product has been properly installed, operated and maintained in...
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