Desa Tech CGN20TA Gas Heater User Manual
Contents
1. You can locate heater on floor away from a wall An optional floor mounting stand is needed Purchase the floor mounting stand from your dealer See Accessories page 19 104190 OWNER S MANUAL A WARNING Never install the heater inabedroom ora bathroom 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 fireplace insert in high traffic areas in windy or drafty areas IMPORTANT Vent free heaters add mois ture to the air Although this is beneficial installing heater in rooms without enough ventilation air may cause mildew to form from too much moisture See Fresh Air for Com bustion and Ventilation pages 4 through 6 A CAUTION If you install the heater in a home garage e heater pilot and burner must be at least 18 inches above floor locate heater where moving ve hicle will not hit it A CAUTION This heater cre ates warm air currents These currents move heat to wall sur faces next to heater Installing heater next to vinyl or cloth wall coverings or operating heater where impurities in the air Such as tobacco smoke exist may discolor walls For convenience andefficiency install heater e where there is easy access for operation inspection and service e in coldest part of room An optional fan kit is available from your d2. 1 Check burner for dirt and debris If found clean burner see Cleaning and Maintenance page 17 2 Replace gas regulator Slight smoke or odor during initial opera tion 1 Residues from manufacturing processes 1 Problem will stop after a few hours of operation Heater produces a whistling noise when burner is lit 104190 1 Turning control knob to HI position when burner is cold 2 Air in gas line 3 Air passageways on heater blocked 4 Dirty or partially clogged burner orifice 1 Turn control knob to LO position and let warm up for a minute 2 Operate burner until air is removed from line Have gas line checked by local natural gas company 3 Observe minimum installation clear ances see Figure 4 page 7 4 Clean burner see Cleaning and Mainte nance page 17 or replace burner orifice Continued Comfort Glow CGN20TA Blue Flame Vent Free Natural Gas Heater TROUBLESHOOTING Continued building A WARNING 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 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 glu
3. codes 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 pro vide 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 and 2 Figure 2 You can also remove door into adjoining room see op tion 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 A WARNING Rework work sheet adding the space of the adjoining unconfined space The combined spaces must have enough fresh air to supply all appliances in both spaces Ventilation Air From Outdoors Provide extra fresh air by using ventilation grills or ducts You must provide two per manent 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 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 Ventilation Grills into Adjoining Room Option 1 Or Remove Door into Adjoining Room Option 3 Ventilation Grills I
4. you can provide greater clear ances from floor and joining wall 2 Mark screw locations on wall see Fig ure 8 Note Only mark last hole on each end of mounting bracket Insert mounting screws through these holes only 3 Remove tape and mounting bracket from wall L 7 1 4 16 Only Insert Mounting Screws Through Last Min Hole On Each End 5 Wait Floor Figure 8 Mounting Bracket Clearances 104190 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 drill bit 2 Place mounting bracket onto wall Line up last hole on each end of bracket with holes drilled in wall 3 Insert mounting screws through bracket and into wall studs 4 Tighten screws until mounting bracket is firmly fastened to wall studs Attaching to wall anchor method For attaching mounting bracket 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 deep 2 Fold wall anchor as shown in Figure 9 Figure 9 Folding Anchor 104190 OWNER S MANUAL 3 Insert wal
5. 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 Thermostat models have a thermostat sens ing bulb and a control valve This results in the greatest heater comfort This can also result in lower gas bills Heater Cabinet UNPACKING 1 Remove heater from carton 2 Remove all protective packaging ap plied to heater for shipment 3 Check heater for any shipping damage If heater is damaged promptly inform dealer where you bought heater Comfort Glow CGN20TA Blue Flame Vent Free Natural Gas Heater FRESH AIR FOR COMBUSTION AND VENTILATION Ay WARNING This heater shall not be installed in a confined space unless provisions are pro vided for adequate combustion and ventilation air Read the fol lowing instructions to insure proper fresh air for this and other fuel burning appliances in your home Today s homes are built more energy effi cient than ever New materials increased insulation and new construction methods help reduce heat loss in homes Home own ers weather strip and caulk around windows and doors to keep the cold air out and the warm air in During heating months hom
6. holding piezo ignitor to heater cabinet Nut is located inside heater cabinet at top Replace ignitor cable Replace piezo ignitor When ignitor button is pressed there is spark at ODS pilot but no ignition Gas supply turned off or manual shutoff valve closed Control knob not in PILOT position Control knob not pressed in while in PI LOT position Air in gas lines when installed ODS pilot is clogged Gas regulator setting is not correct Turn on gas supply or open manual shutoff valve Turn control knob to PILOT position Press in control knob while in PILOT position Continue holding down control knob Repeat igniting operation until air is re moved Clean ODS pilot see Cleaning and Maintenance page17 or replace ODS pilot assembly Replace gas regulator ODS pilot lights but flame goes out when control knob is released On 4 A Control knob not fully pressed in Control knob not pressed in long enough Safety interlock system has been trig gered Thermostat models only Manual shutoff valve not fully open Thermocouple connection loose at con trol valve Pilot flame not touching thermocouple which allows thermocouple to cool causing pilot flame to go out This prob lem could be caused by one or both of the following A Low gas pressure B Dirty or partially clogged ODS pilot Thermocouple damaged Control valve damaged
7. line pressure be fore 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 Sc Pressure Regulator N Be LY 3 8 NPT N 4 Pipe Nipple i _ Test 2 Gau Bushing to 1 8 NPT Connection 19 1 8 0 Plug ge Tee Joint Sediment Pipe Nipple Trap Peer j 3 Minimum Cap i Figure 13 Gas Connection Ground Joint Union Tee Joint y GA Reducer 2 1 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 Use pipe joint seal ant that is resistant to liquid pe troleum LP gas Install sediment trap in supply line as shown in Figure 13 Locate sediment trap where it is within reach for cleaning Locate sedi ment trap where trapped matter is not likely to freeze A sediment trap traps moisture and contaminants This keeps them from going into heater controls If sediment trap is not installed or is installed wrong heater may not run properly IMPORTANT Hold pressure regulator with wrench when connecting it to gas pip ing and or fittings Heater Cabinet Manual Shutoff Valve Typical Inlet Pipe from Gas Meter 4 W C to 10 5 W C Pressure An A G A design certified manual shutoff valve with 1 8 NPT tap is an a
8. manual for future reference Comfort Glow CGN20TA Blue Flame Vent Free Natural Gas Heater SAFETY INFORMATION A WARNINGS IMPORTANT Read this owner s manual carefully and completely before trying to assemble oper ate or service this heater Im proper use of this heater can cause serious injury or death from burns fire explosion electrical shock and carbon monoxide poisoning AN DANGER Carbon monoxide poisoning may lead to death Carbon Monoxide Poisoning Early signs of carbon monoxide poisoning re semble the flu with headaches dizziness or nausea If you have these signs 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 include pregnant women people with heart or lung disease or anemia those under 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 A WARNING Any change tothis heater or its controls can be dan gerous 4 This appliance is only for use with the type of gas indicated
9. may be running this heater for the first time after hook ing up to gas supply If so the con trol knob may need to be pressed in for 30 seconds This will allow air to bleed from the gas system If control knob does not pop up when released contact a qualified service person or gas supplier for repairs 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 Control Knob Ignitor Button IGNITOR Figure 16 Control Knob In The OFF Position Note If pilot does not stay lit refer to Troubleshooting pages 14 through 16 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 13 7 Keep control knob pressed in for 30 seconds after lighting pilot After 30 seconds release control knob 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 to desired heating level The main burner should light Set control knob to any heat level between HI and LO Ignitor Electrode Pilot Burner Thermocouple Figure 17 Pilot A CAUTION Donottry to adjust heating leve
10. on the rating plate This appliance is not convertible for use with other gases 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 build ing immediately call your gas supplier from neighbor s phone Follow the gas supplier s instructions if you cannot reach your gas supplier call the fire department This heater shall not be installed in a bedroom or bathroom 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 This heater needs fresh outside air ven tilation to run properly This heater has an oxygen depletion sensor ODS pi lot light safety system The ODS shuts down the heater if not enough fresh air is available See Fresh Air for Combus tion and Ventilation pages 4 through 6 10 11 12 13 14 15 Keep air openings in front and bottom of heater clear and free of debris This will ensure enough air for proper com bustion If heater shuts off do not relight until you provide fresh outside air If heater keeps shutting off have it serviced Do not run heater e where flammable liquids or vapors are used or stored under dusty conditions Never place any objects on the heater Sur
11. pounds Heater 22 Shipping 27 REPLACEMENT PARTS Note Use only original replacement parts This will protect your warranty coverage for parts replaced under warranty Parts Under Warranty Contact authorized dealers of this product If they can t supply original replacement part s either contact your nearest Parts Central see below or call DESA International s Technical Service Depart ment at 1 800 323 5190 for referral infor mation When calling DESA International have ready your name e your address model number of your heater e how heater was malfunctioning type of gas used propane LP or natural gas e purchase date Usually we will ask you to return the defec tive part to the factory Parts Not Under Warranty Contact authorized dealers of this product If they can t supply original replacement part s either contact your nearest Parts 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 17 TECHNICAL SERVICE You may have further questions about in stallation operation or troubleshooting If so contact DESA International s Technical Service Department at 1 800 323 5190 SERVICE HINTS When gas pressure is too low e pilot will not stay lit e burner will have delayed ignition e heater will not
12. produce specified heat When gas guality is bad pilot will not stay lit e burner will produce flames and soot e 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 Comfort Glow CGN20TA Blue Flame Vent Free Natural Gas Heater PARTS CENTRALS Baltimore Electric 1348 Dixwell Avenue Hamden CT 06514 1 800 397 7553 203 248 7553 Parts Department Portable Heater Parts 342 N County Rd 400 East Valparaiso IN 46383 All States 219 462 7441 1 800 362 6951 FBD P O Box 1096 1720 Kummer Road Franklin KY 42134 502 586 1922 1 800 654 8534 Four Flags Power Products 1115 Stateline Road Niles MI 49120 616 684 2697 1 800 268 4983 Master Service Center 1184 Wilson NW Walker MI 49504 616 791 4760 1 800 446 1446 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 Kansas City MO 64108 KS MO AR 816 842 3911 East Coast Energy Products 833 Broadway W Long Branch NJ 07764 908 870 8809 1 800 755 8809 Tarantin Tank Co P O Box 6129 Freehold NJ 07728 908 780 9340 1 800 922 0724 Albany Ladder 1586 90 Central Avenue Albany NY 12205 NY MA VT 518 869 5335 1 800 354 7368 Dayton Hardware P O Box 275 North Dayton Station Dayton OH 45404 All State
13. 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 build ing Immediately call your gas supplier from a neighbor s phone Follow the gas supplier s instructions If you cannot reach your gas sup plier 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 un der water in LIGHTING INSTRUCTIONS 1 STOP Read the safety information above 2 Make sure manual shutoff valve is fully open 3 Turn control knob clockwise N to the OFF position 4 Wait five 5 minutes to clear out any gas Then smell for gas including near the floor If you smell gas STOP Follow B in the safety in formation in column 1 If you don t smell gas go to the next step 5 Turn control knob counterclockwise to the PILOT position Press in control knob for five 5 sec onds see Figure 16 Note You
14. 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 WARNING This is an followed exactly a fire or explosion may result unvented gas fired heater It causing property damage personal injury or loss uses air oxygen from the of life room in which it is installed Provisions for Donotstore or use gasoline or other flammable ovisions for adequate n combustion must be pro vapors and liguids in the vicinity of this or any other appliance vided Refer to page 4 of this manual 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 Ifyoucannotreach 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
15. Press in control knob fully 2 After ODS pilot lights keep control A knob pressed in 30 seconds Wait one 1 minute for safety interlock system to reset Repeat ignition operation Fully open manual shut off valve Hand tighten until snug then tighten 1 4 turn more A Contact local natural gas company B Clean ODS pilot see Cleaning and Maintenance page 17 or replace ODS pilot assembly Replace thermocouple Replace control valve 104190 TROUBLESHOOTING Continued OBSERVED PROBLEM OWNER S MANUAL POSSIBLE CAUSE REMEDY Burner does not light after ODS pilot is lit 1 Burner orifice is clogged 2 Burner orifice diameter is too small Inlet gas pressure is too low va 1 Clean burner see Cleaning and Mainte nance page 17 or replace burner orifice 2 Replace burner orifice 3 Contact local natural gas company Delayed ignition of burner 1 Manifold pressure is too low 2 Burner orifice is clogged 1 Contact local natural gas company 2 Clean burner see Cleaning and Mainte nance page 17 or replace burner orifice Burner backfiring during combustion 1 Burner orifice is clogged or damaged 2 Burner damaged 3 Gas regulator defective 1 Clean burner see Cleaning and Mainte nance page 17 or replace burner orifice 2 Replace burner 3 Replace gas regulator Yellow flame during burner combustion 1 Not enough air 2 Gas regulator defective
16. WNER S MANUAL PARTS L ST This list contains replaceable parts used in your heater When ordering parts follow the instructions listed under Replacement Parts on page 17 of this manual CGN20TA KEY PART NO 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 098352 04BR Deflector Unit 098271 02 Ignitor Cable 098249 01 Nut M5 099440 05 ODS Pilot Assembly 098514 01 Thermocouple 098515 01 Ignitor Electrode 099120 02 Burner 098517 01 3 16 Pilot Tubing 098250 01 Injector Holder 098251 09 Injector 099415 07 Pressure Regulator 099553 01 Pilot Shield 103255 01 3 8 Outlet Burner Tubing 103256 01 3 8 Inlet Tubing 098522 10 Thermostat Gas Valve 098530 05 Cabinet for CGN20TA Woodgrain 097159 04 Piezo Ignitor M11084 26 Screw 10 x 3 8 M11084 38 Screw 8 x 3 8 099066 01 Mounting Bracket PARTS AVAILABLE NOT SHOWN 098305 01 Control Position Label 1 100642 01 Hardware Assembly 1 Ka a an pp a2 ap 104190 21 Comfort Glow CGN20TA Blue Flame Vent Free Natural Gas Heater NOTES OWNER S MANUAL NOTES WARRANTY INFORMATION KEEP THIS WARRANTY Model Serial No Date Purchased Always sp
17. ame ADAM 1 Glass Height Correct Flame Pattern At High Position Figure 20 Correct Burner Flame Pattern Yellow Tipping awe if Glass l Height Incorrect Flame Pattern At High Position Figure 21 Incorrect Burner Flame Pattern If burner flame pattern is incorrect as shown in Figure 21 e turn heater off see To Turn Off Gas to Appliance page 12 e see Troubleshooting pages 14 through 16 Comfort Glow CGN20TA Blue Flame Vent Free Natural Gas Heater TROUBLESHOOTING Note All troubleshooting items are listed in order of operation OBSERVED PROBLEM AX WARNING Turn off and un plug heater and let cool before servicing Only a qualified ser vice person should service and repair heater POSSIBLE CAUSE A CAUTION Never use a wire needle or similar object to clean ODS pilot This can damage ODS pilot unit REMEDY When ignitor button is pressed there is no spark at ODS pilot 1 Ignitor electrode broken Ignitor electrode not connected to igni Ignitor electrode positioned wrong tor cable Ignitor cable pinched or wet Piezo ignitor nut is loose Broken ignitor cable Bad piezo ignitor Replace ignitor Replace ignitor Reconnect ignitor cable Free ignitor cable if pinched by any metal or tubing Keep ignitor cable dry Tighten nut
18. bracket is located on back panel of heater It has been taped there for shipping Remove mounting bracket from back panel Mounting Bracket Removing Front Panel Of Heater 1 Remove two screws near bottom cor ners of front panel Figure 6 Bracket Location 2 Liftstraightup on grill guard until it stops Grill guard will slide up about 1 4 3 Pull bottom of front panel forward then downward 4 Remove cardboard packing from grill and glass LL Figure 7 Removing Front Panel Of Heater Methods For Attaching Mounting Bracket To Wall Only use last hole on each end of mounting bracket to attach bracket to wall These two holes are 16 inches apart from their centers Attach mounting bracket to wall in one of two ways 1 Attaching to wall stud 2 Attaching to wall anchor Attaching to wall stud This method provides the strongest hold Insert mounting screws through mounting bracket and into wall studs Attaching to wall anchor This method allows you to attach mounting bracket to hollow walls wall areas between studs or to solid walls concrete or ma sonry Decide which method better suits your needs Either method will provide a secure hold for the mounting bracket Marking Screw Locations 1 mounting bracket to wall where heater will be located Make sure mounting bracket is level AN WARNING Maintain minimum clearances shown in Figure 8 If
19. cceptable alternative to test gauge connection Purchase the optional A G A design certified manual shutoff valve from your dealer See Accessories page 19 10 104190 CHECKING GAS CONNECTIONS A WARNING Test all gas pip ing and connections for leaks after installation or servicing Correct all leaks at once A 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 Cap off open end of gas pipe where manual shutoff valve was connected Pressurize supply piping system by ei ther using compressed air or opening main gas valve located on or near gas meter Check all joints of gas supply piping system Apply mixture of liquid soap and water to gas joints Bubbles form ing show a leak Correct all leaks at once 104190 1 4 Manual Shutoff Valve OWNER S MANUAL Test Pressures Equal To or Less Than 1 2 PSIG Close manual shutoff valve see Fig ure 14 Pressurize supply piping system by ei ther using compressed air or opening main gas valve located on or near gas meter Check all joints from gas meter to manual shutoff valve
20. e owners want their homes as airtight as pos sible 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 com bustion and ventilation Exhaust fans fireplaces clothes dryers and fuel burning appliances draw air from the house to operate You must provide ad equate 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 7223 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 4 through 6 will help you classify your space and provide adequate ventilation Unusually Tight Construction The air that leaks around doors and win dows 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 de fined as construction where a walls and ceilings exposed to the outside atmosphere have a con tinuous water vapor retarder with a rating of one perm 6x10 kg per pa sec m or less with open ings gasketed or sealed and b weather stripping has been added on openabl
21. e windows and doors and c caulking or sealants are applied to areas such as joints around window and door frames be tween sole plates and floors be tween wall ceiling joints be tween wall panels at penetra tions for plumbing electrical and gas lines and at other openings If your home meets all of the three criteria above you must provide ad ditional fresh air See Ventilation Air From Outdoors page 6 If your home does not meet all of the three criteria above proceed to page 5 Confined and Unconfined Space The National Fuel Gas Code ANSIZ2123 1 1992 Section 5 3 defines a confined space as a space whose volume is less than 50 cubic feet per 1 000 Btu per hour 4 8 per kw of the aggregate input rating of all appliances installed in that space and an unconfined space as a space whose volume is not less than 50 cubic feet per 1 000 Btu per hour 4 8 m per kw of the aggregate input rating of all appliances installed in that space Rooms communicating directly with the space in which the appliances are in stalled through openings not furnished with doors are considered a part of the unconfined space Adjoining rooms are communicating only if there are doorless passageways or ventila tion grills between them Cubic feet equals length x width x height of room 104190 FRESH AIR FOR COMBUSTION AND VENTILATION Continued DETERMINING FRESH AIR FLOW FOR HEATER LOCATION Determining i
22. ealer See Accessories page 19 If plan ning to use fan locate heater near an electri FLOOR cal outlet on CEILING 36 Minimum Minimum From Si des Of Heater Left Side Side HL or SLO 3 Minimum To Top Surface t Of Carpeting Tile Or Other Combustible Material Figure 4 Mounting Clearances As Viewed From Front of Heater Continued Comfort Glow CGN20TA Blue Flame Vent Free Natural Gas Heater INSTALLATION Continued THERMOSTAT SENSING BULB The thermostat sensing bulb has been placed inside the heater for protection during ship ping Locating Thermostat Sensing Bulb 1 Remove front panel of heater see Fig ure 7 page 8 2 Locate thermostat sensing bulb just under burner assembly IMPORTANT Attach thermostat sensing bulb to back of heater for proper operation Attaching Thermostat Sensing Bulb 1 Remove thermostat sensing bulb from holders inside heater Route through slot opening in bottom of heater 2 Place clamp on thermostat sensing bulb as shown in Figure 5 Clamp is pro vided in hardware package 3 Snap clamp into upper mounting hole as shown in Figure 5 Mounting hole is located on lower left edge on back of heater Make sure the thermostat sens ing bulb is pointing up Thermostat Sensing Bulb Figure 5 Attaching Thermostat Sensing Bulb INSTALLING HEATER TO WALL Mounting Bracket The mounting
23. ecify 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 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 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 this heater to proper operating condition and an allowance for labor when provided by a DESA Authorized Service Center 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 or become damaged as a result of misuse accidents lack of p
24. es new carpet or textiles etc create fumes These fumes may mix with combustion air and create odors OBSERVED PROBLEM POSSIBLE CAUSE REMEDY Heater produces a clicking ticking noise just after burner is lit or shut off 1 Metal expanding while heating or con tracting while cooling 1 This is common with most heaters If noise is excessive contact qualified ser vice person Heater produces unwanted odors Heater burning vapors from paint hair spray glues etc See IMPORTANT statement above Gas leak See Warning statement at top of page Ventilate room Stop using odor caus ing products while heater is running Locate and correct all leaks see Check ing Gas Csonnections page 11 Heater shuts off in use ODS operates Not enough fresh air is available Low line pressure ODS pilot is partially clogged Open window and or door for ventilation Contact local propane LP gas company Clean ODS pilot see Cleaning and Maintenance page 17 Gas odor even when control knob is in OFF position Gas leak See Warning statement at top of page Control valve defective Locate and correct all leaks see Check ing Gas Connections page 11 Replace control valve Gas odor during combustion Foreign matter between control valve and burner Gas leak See Warning statement at top of page Take apart gas tubing and remove for eign mat
25. f 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 20 ft length x 16 ft width x 8 ft ceiling height 2560 cu ft volume of space If additional ventilation to adjoining room is supplied with grills or open ings add the volume of these rooms to the total volume of the space 104190 OWNER S MANUAL 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 2560 cu ft volume of space 50 cu ft 51 2 or 51 200 maximum Btu Hr the space can sup port 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 Example Gas water heater Vent free heater 20 000 Btu Hr Total 60 000 Btu Hr Do not include direct vent gas appli ances Direct vent draws combustion air from the outdoors and vents to the outdoors 40 000 Btu Hr 4 Compa
26. face 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 shut down Allow surface to cool before touching Carefully supervise young children when they are in the same room with heater Make sure grill guard is in place be fore running heater 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 Turn off and unplug heater and let cool before servicing Only a qualified ser vice person should service and repair heater Operating heater above elevations of 4 500 feet could cause pilot outage 104190 PRODUCT IDENTIFICATION 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 Available from American National Standards Institute Inc 1430 Broadway New York NY 10018 National Fire Protection Association Inc Batterymarch Park Quincy MA 02269 104190 OWNER S MANUAL Ignitor Button LTT T LTT Control Knob Grill Guard Glass Panel PRODUCT FEATURES Safety Device This
27. ing bracket 6 Place spacers between bottom mount ing holes and wall anchor or drilled hole 7 Hold spacer in place with one hand With other hand insert mounting screw through bottom mounting hole and spacer Place tip of screw in opening of wall anchor or drilled hole 8 Tighten both screws 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 10 and 11 Figure 12 Installing Bottom Mounting Screws Comfort Glow CGN20TA Blue Flame Vent Free Natural Gas Heater CONNECTING TO GAS SUPPLY NOTICE A qualified service per son must connect heater to gas supply Follow all local codes A CAUTION Use only new black iron or steel pipe Inter nally tinned copper tubing may be used in certain areas Check your local codes Use pipe of large enough diameter to allow proper gas volume to heater If pipe is too small undue loss of pres sure will occur A WARNING Never connect heater to private non utility gas wells This gas is commonly known as well head gas Typical Inlet Pipe Diameters 20 000 Btu Hr Installation must include a manual shutoff valve union and plugged 1 8 NPT tap Locate NPT tap within reach for test gauge hook up NPT tap must be upstream from heater see Figure 13 3 8 or greater IMPORTANT Check gas
28. l 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 IMPORTANT Do not hammer key For thick walls over 1 2 thick or solid walls do not pop open wings SY Figure 10 Popping Open Anchor Wings For Thin Walls 5 Place mounting bracket onto wall Line up last hole on each end of bracket with wall anchors 6 Insert mounting screws through bracket and into wall anchors 7 Tighten screws until mounting bracket is firmly fastened to wall Placing Heater On Mounting Bracket 1 Locate two horizontal slots on back panel of heater Place heater onto mounting bracket Slide horizontal slots onto stand out tabs on mounting bracket Horizontal Slots pa o Stand Out Tab Mounting Bracket attached to wall Figure 11 Mounting Heater Onto Mounting Bracket AYN Installing Bottom Mounting Screws 1 Locate two bottom mounting holes These holes are near bottom on back panel of heater see Figure 12 Mark screw locations on wall Remove heater from mounting bracket If installing bottom mounting screws into hollow or solid wall install wall anchors Follow steps through 4 un der Attaching To Wall Anchor Method column 1 If installing bottom mounting screw into wall stud drill holes at marked lo cations using 9 64 drill bit 5 Replace heater onto mount
29. ls by using the manual shutoff valve TO TURN OFF GAS TO APPLIANCE Shutting Off Heater 1 Turn control knob clockwise 7 N to the OFF position 2 Turn off all electric power to the ap pliance if service is to be performed Shutting Off Burner Only pilot stays lit 1 Turn control knob clockwise the PILOT position 104190 OPERATING HEATER Continued 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 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 mea sures the temperature of air near the heater cabinet This may not always agree with room temperature depending on housing construction installation loca tion room size open air temperatures etc Frequent use of your heater will let you determine your own comfort levels MANUAL LIGHTING PROCEDURE 1 Remove front panel see Figure 7 page 8 2 Follow steps 1 through 5 under Light ing Instructions page 12 3 With con
30. nto Adjoining Room Option 2 MM 4 12 Figure 2 Ventilation Air from Inside Building Outlet Air Inlet Air Inlet Air gt Ventilated Attic To Attic Ventilated Crawl Space Figure 3 Ventilation Air from Outdoors 104190 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 INSTALLATION ITEMS Before installing heater make sure you have the items listed below e piping check local codes e sealant resistant to propane LP gas e manual shutoff valve e ground joint union e test gauge connection see Figure 13 page 10 e sediment trap e tee joint e pipe wrench AnA G A design certified manual shutoff valve with 1 8 NPT tap is an acceptable alternative to test gauge connection Pur chase the optional A G A design certified manual shutoff valve from your dealer See Accessories page 19 LOCATING HEATER This heater is designed to be mounted on a wall AX WARNING Maintain the mini mum clearances shown in Figure 4 Ifyou provide greater clear ances from floor ceiling and join ing wall
31. re 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 51 200 Btu Hr maximum the space can support 60 000 Btu Hr actual amount of Btu Hr used The space in the above example is a con fined 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 ventila tion grills between rooms See Ventila tion Air From Inside Building page 6 Vent room directly to the outdoors See Ventilation Air From Outdoors page 6 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 Continued Comfort Glow CGN20TA Blue Flame Vent Free Natural Gas Heater FRESH AIR FOR COMBUSTION AND VENTILATION Continued WARNING Ifthearea in which the heater may be operated is smaller than that defined as an unconfined space provide ad equate combustion and ventila tion air by one of the methods described in the National Fuel Gas Code ANSI Z223 1 1992 Section 5 3 or applicable local
32. roper maintenance or defects caused by improper installation 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 WARRANTIES AND LIMITS THE DURATION OF ANY AND ALL IMPLIED WARRANTIES INCLUDING WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE TO TWO 2 YEARS 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 INCI DENTAL 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 DESA INTERNATIONAL 2701 Industrial Drive P O Box 90004 NORME at aa Bowling Green KY 42102 9004 09 97
33. s 513 258 3721 OH 1 800 762 3426 Halco Enterprises 208 Carter Drive Unit 21 West Chester PA 19382 215 696 2670 1 800 368 0803 LA Porte s Parts amp Service 2444 N Sth Street Hartsville SC 29550 803 332 0191 Parts Department Cans Unlimited Inc P O Box 645 Taylor SC 29687 All States 803 879 3009 1 800 845 5301 104190 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 FLOOR MOUNTING STAND GA4500 Champagne For locating heater on the floor away from a wall Complete installation instructions included MANUAL SHUTOFF VALVE GA5010 Forall models Manual shutoff valve with 1 8 NPT tap 104190 OWNER S MANUAL FAN KITS GA3100A AND GA3200TA For all models Provides better heat distri bution Makes heater more efficient Com plete installation and operating instructions included Manually controlled GA3100A Includes ON OFF switch Thermostatically controlled GA3200TA Includes three settings ON OFF AUTO Comfort Glow CGN20TA Blue Flame Vent Free Natural Gas Heater ILLUSTRATED PARTS BREAKDOWN CGN20TA 2 ODS Pilot Assembly 20 104190 O
34. see Figure 15 Apply mixture of liquid soap and wa ter to gas joints Bubbles forming show a leak Correct all leaks at once Se Open Closed Figure 14 Manual Shutoff Valve Gas Meter PRESSURE TESTING HEATER GAS CONNECTIONS 1 Open manual shutoff valve see Fig ure 14 2 Open main gas valve located on or near gas meter 3 sure control knob of heater is in the OFF position 4 Check all joints from manual shutoff valve to thermostat gas valve see Fig ure 15 Apply mixture of liquid soap and water to gas joints Bubbles form ing show a leak 5 Correct all leaks at once 6 Light heater see Operating Heater pages 12 and 13 Check the rest of the internal joints for leaks 7 Turn off heater see To Turn Off Gas to Appliance page 12 8 Replace front panel Thermostat Gas Valve Manual Shutoff Valve Figure 15 Checking Gas Joints Comfort Glow CGN20TA Blue Flame Vent Free Natural Gas Heater OPERATING HEATER FOR YOUR SAFETY READ BEFORE LIGHTING A WARNING If you do not fol low these instructions exactly a fire or explosion may result caus ing 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 ex actly BEFORE LIGHTING smell all around the appliance area for gas Be sure
35. ter Locate and correct all leaks see Check ing Gas Connections page 11 Moisture condensation noticed on windows Not enough combustion ventilation air 1 Refer to Air for Combustion and Venti lation requirements page 4 104190 CLEANING AND MAINTENANCE AX WARNING Turn off heater and let cool before cleaning A CAUTION You must keep control areas burner and circu lating 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 clean ing due to excessive lint from carpeting bedding material etc ODS PILOT AND BURNER e Use a vacuum cleaner pressurized air or small soft bristled brush to clean CABINET Air Passageways e Use a vacuum cleaner or pressurized air to clean Exterior e Use a soft cloth dampened with a mild soap and water mixture Wipe the cabi net to remove dust SERVICE PUBLICATIONS 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 104190 OWNER S MANUAL SPECIFICATIONS CGN20TA Btu Variable 10 000 20 000 Type Gas Natural Only Ignition Piezo Pressure Regulator Setting 3 W C Inlet Gas Pressure in of water Maximum 10 5 Minimum 4 Dimensions Inches H x W x D Heater 23 5 18 5 x 8 0 Carton 25 8 x 21 3 x 10 1 Weight
36. trol knob pressed in strike match Hold match to pilot until pi lot lights 4 Keep control knob pressed in for 30 seconds after lighting pilot After 30 seconds release control knob 5 Replace front panel 104190 OWNER S MANUAL INSPECTING BURNER Check pilot flame pattern and burner flame pattern often PILOT FLAME PATTERN Figure 18 shows a correct pilot flame pat tern Figure 19 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 Figure 19 Incorrect Pilot Flame Pattern If pilot flame pattern is incorrect as shown in Figure 19 e turn heater off see To Turn Off Gas to Appliance page 12 e see Troubleshooting pages 14 through 16 BURNER FLAME PATTERN Figure 20 shows a correct burner flame pattern Figure 21 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 A WARNING If yellow tipping occurs your heater could pro duce increased levels of carbon monoxide If burner flame pat tern shows yellow tipping follow instructions at bottom of this page NOTICE Do not mistake orange flames with yellow tipping Dirt or other fine particles enter the heater and burn causing brief patches of orange fl
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