— Installation and service must be per- formed by a qualified installer, service agency, or the gas supplier. Save this manual for future reference Model: CGN12 WARNING adjustment, alteration, service, or maintenance can cause injury or property damage. Refer to this manual for correct installation and operational procedures.
CONTENTS SAFETY INFORMATION SECTION Safety Information ... 2 Product Identification ... 4 Local Codes ... 4 Unpacking ... 4 Product Features ... 4 Installing To Wall ... 5 Connecting To Gas Supply ... 9 Checking Gas Connections ... 10 Operating Heater ... 12 For Your Safety Read Before Lighting ...
SAFETY INFORMATION 1. Use only natural gas. Do not convert heater to use different fuel type. 2. If you smell gas Continued 3. Never install the heater 4. Always run heater with control knob at LOW or HIGH locked positions. 5.
PRODUCT IDENTIFICATION LOCAL CODES UNPACKING PRODUCT FEATURES 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*.
INSTALLING TO WALL A qualified service person must install heater. Follow all local codes. 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.
INSTALLING TO WALL Continued CEILING 8" Minimum From Sides Of Heater Left Side FLOOR Figure 2 - Mounting Clearances As Viewed From Front of Heater INSTALLING HEATER TO WALL Marking Screw Locations 1. Determine where you will locate heater. WARNING ICON Maintain minimum clearances shown in Figure 3.
Installing Two Mounting Screws Note: Wall anchors and mounting screws are in hardware package. The hardware package is provided with heater. Attaching to wall stud method For attaching mounting screw to wall stud 1. Drill hole at marked location using 9/64" drill bit. 2.
Placing Heater On Mounting Screws 1. Locate two keyhole slots on back panel of heater (see Figure 7). 2. Place large openings of slots over screwheads. Slide heater down until screws are in small portion of slots. Figure 7 - Location Of Keyhole Slots On Back Panel Of Heater Removing Front Panel Of Heater 1.
CONNECTING TO GAS A qualified service person must connect heater to gas supply. Follow all local codes. SUPPLY Never connect heater to private (non-utility) gas wells. This gas is commonly known as well-head gas. IMPORTANT: Check gas line pressure before connecting heater to gas line. Gas line pressure must be no greater than 14 inches of water.
CHECKING CONNECTIONS IMPORTANT: Hold pressure regulator with wrench when connecting it to gas piping and/or fittings. 3/8" NPT Pipe Nipple Ground Joint Union Manual Shutoff Valve * From Gas Meter (4" W.C. to 10.5" W.C. Pressure) 3" Minimum Figure 10 - Gas Connection * An A.G.A.
4. Check all joints of gas supply piping system. Apply mixture of liquid soap and water to gas joints. Bubbles forming show a leak. 5. Correct all leaks at once. Test Pressures Equal To or Less Than 1/2 PSIG 1. Close manual shutoff valve (see Figure 11). 2.
OPERATING HEATER FOR YOUR SAFETY READ BEFORE LIGHTING WARNING ICON 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.
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 12. If you don’t smell gas, go to the next step. 5.
TO SELECT HEATING LEVEL WARNING ICON G 001 When running heater, set control knob at LOW or HIGH locked positions. Never set control knob between locked positions. Poor combustion and higher levels of carbon monoxide may result. WARNING ICON Do not try to adjust heating levels by using the manual shutoff valve.
Shutting Off Heater 1. Turn control knob clockwise Shutting Off Burner Only (pilot stays lit) 1. Turn control knob clockwise 1. Remove front panel (see Figure 8, page 8). 2. Follow steps 1 through 6 under LIGHTING INSTRUCTIONS, pages 12 and 13. 3.
BURNER FLAME PATTERN Figure 18 shows a correct burner flame pattern. Figure 19 shows an incorrect burner flame pattern. Figure 18 - Correct Burner Flame Pattern Figure 19 - Incorrect Burner Flame Pattern If burner flame pattern is incorrect, as shown in Figure 19 •...
CLEANING MAINTENANCE TROUBLE- SHOOTING Note: All troubleshooting items are listed in order of operation. WARNING ICON Turn off heater and let cool before cleaning. WARNING ICON You must keep control areas, burner, and circulating air passageways of heater clean. Inspect these areas of heater before each use.
OBSERVED POSSIBLE PROBLEM CAUSE When control knob is 1. Gas supply turned off or pressed in and turned manual shutoff valve to the PILOT/IGN po- closed sition, there is spark at 2. Control ODS/pilot but no igni- pressed in while being tion turned to PILOT/IGN position...
OBSERVED POSSIBLE PROBLEM CAUSE Burner(s) does not 1. Burner orifice(s) is light after ODS/pilot is clogged 2. Burner orifice(s) di- ameter is too small 3. Inlet gas pressure is too Delayed ignition of 1. Manifold pressure is too burner(s) 2. Burner orifice(s) is clogged Burner backfiring 1.
2. Gas leak. See Warn- ing statement at top of page You may have further questions about installation, operation, or troubleshooting. If so, contact DESA International’s Technical Service Department at 1-800-323- 5190. WARNING G 001 REMEDY 1. Ventilate room. Stop us-...
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: •...
Send a check for $5.00 payable to DESA International. Purchase this heater accessory from your local dealer. If they cannot supply this accessory, either contact your nearest Parts Central (see above) or call DESA International’s Parts Department at 1-800-972-7879. You can also write to the address listed on the back page of this manual.
PARTS LIST This list contains replaceable parts used in your heater. When ordering parts, follow the instructions listed under REPLACEMENT PARTS on page 21 of this manual. PART NUMBER DESCRIPTION 098304-01 Screw, #10 x 3/8" 099467-02 Front Panel Assembly 099318-01 Grill Guard 098342-01 Grill Guard Clip...
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.