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DESA INTERNATIONAL
UNVENTED (VENT-FREE)
NATURAL GAS LOG HEATER
ALSO DESIGN-CERTIFIED AS A VENTED DECORATIVE APPLIANCE
OWNER’S OPERATION AND INSTALLATION MANUAL
"A" Model
18", 24", and 30"
CFS18NRA
Remote-Ready
VS18NRA
VS24NRA
VS30NRA
®
WARNING: Improper installation, adjust-
WARNING: If the information in this
ment, alteration, service, or maintenance
manual is not followed exactly, a fire or
can cause injury or property damage.
explosion may result causing property
Refer to this manual
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DESA INTERNATIONAL UNVENTED NATURAL GAS LOG HEATER • if you cannot reach your gas supplier, 12. Do not use a blower insert, heat ex- SAFETY call the fire department changer insert or other accessory not approved for use with this heater. INFORMATION 3. This heater shall not be installed in a bedroom or bathroom unless installed 13. This heater needs fresh, outside air ven- WARNINGS as a vented appliance (see Installing tilation to run properly. This heater has Damper Clamp Accessory for Vented
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HI TEMP MAN LO ON AUTO OFF STATUS OWNER’S MANUAL PRODUCT PRODUCT IDENTIFICATION FEATURES Crossover Log OPERATION This heater is clean burning. It requires no Rear Log outside venting. There is no heat loss out a vent or up a chimney. Heat is generated by Rear both realistic flames and glowing coals. Burner This heater is designed for vent-free opera- Front Log tion with flue damper closed. It has been tested and approved to ANS Z21.11.2 stan- Front dard for unvented heaters. State and local Burn
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DESA INTERNATIONAL UNVENTED NATURAL GAS LOG HEATER Confined and Unconfined Space PROVIDING ADEQUATE AIR FOR VENTILATION The National Fuel Gas Code (ANS Z223.1, COMBUSTION AND 1992 Section 5.3) defines a confined space The following are excerpts from National VENTILATION as a space whose volume is less than 50 Fuel Gas Code. NFPA 54/ANS Z223.1, Sec- 3 cubic feet per 1,000 Btu per hour (4.8 m per tion 5.3, Air for Combustion and Ventilation. kw) of the aggregate input rating of all WARNING: This
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OWNER’S MANUAL AIR FOR COMBUSTION AND VENTILATION Continued DETERMINING FRESH-AIR FLOW FOR HEATER LOCATION Determining if You Have a Confined or Unconfined Space Use this work sheet 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.
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DESA INTERNATIONAL UNVENTED NATURAL GAS LOG HEATER AIR FOR 12" COMBUSTION AND VENTILATION Ventilation Continued Ventilation Grills Grills Into Adjoining Room, Into Adjoining VENTILATION AIR Or Option 2 Room, Remove Ventilation Air From Inside Option 1 Door into Building Adjoining This fresh air would come from an adjoining Room, unconfined space. When ventilating to an Option adjoining unconfined space, you must pro- 3 vide two permanent openings: one within 12" of the ceiling and one within
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OWNER’S MANUAL INSTALLATION AND INSTALLATION WARNING: Seal any fresh air CLEARANCES vents or ash clean-out doors lo- NOTICE: This heater is intended (Vent-Free Operation Only) cated on floor or wall of fireplace. for use as supplemental heat. Use If not, drafting may cause pilot this heater along with your pri- WARNING: Maintain the mini- outage or sooting. Use a heat- mary heating system. Do not in- mum clearances. If you can, pro- resistant sealant. Do not seal stall this heater as your prim
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DESA INTERNATIONAL UNVENTED NATURAL GAS LOG HEATER If Using Mantel IMPORTANT: If you cannot meet these INSTALLATION minimum clearances, you must operate You must have noncombustible material(s) Continued heater with chimney flue damper open. Go above the fireplace opening. Noncombus- to Installing Damper Clamp Accessory for tible materials (such as slate, marble, tile, NOTICE: Manual control heaters Vented Operation, page 10. etc.) must be at least 1/2 inch thick. With may be used as a vented pr
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OWNER’S MANUAL Mantel Shelf INSTALLATION 10" Continued Underside of 8" Mantel Shelf MANTEL CLEARANCES 6" 1 2 /2" In addition to meeting noncombustible mate- rial clearances, you must also meet required clearances between fireplace opening and All minimum distances are mantel shelf. If you do not meet the clear- in inches ances listed below, you will need a hood. Minimum Non- (A) Determining Minimum Mantel Combustible Log Set Material Clearances 12" 18" 20" 22" 24" 24"/30" Models 3 1 If you me
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DESA INTERNATIONAL UNVENTED NATURAL GAS LOG HEATER Damper Clamp INSTALLATION Continued INSTALLING DAMPER CLAMP ACCESSORY FOR Damper Damper VENTED OPERATION Clamp Damper Note: When used as a vented heater, appli- Damper ance must be installed only in a solid-fuel burning fireplace with a working flue and constructed of noncombustible material. If your heater is a manually-controlled model, you may use this heater as a vented Masonry Fireplace Manufactured Fireplace product. There are three reason
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OWNER’S MANUAL CONNECTING TO GAS INSTALLATION CAUTION: Use only new, black SUPPLY Continued iron or steel pipe. Internally-tinned copper tubing may be used in NOTICE: A qualified service per- 6. Attach base to fireplace floor using certain areas. Check your local son must connect heater to gas masonry screws (in hardware package). codes. Use pipe of 1/2" diameter supply. Follow all local codes. or greater to allow proper gas vol- 7. Connect to gas supply. See Connect- ume to heater. If pipe is
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DESA INTERNATIONAL UNVENTED NATURAL GAS LOG HEATER Test Pressures Equal To or Less Than Pressure Testing Heater Gas INSTALLATION 1/2 PSIG Connections Continued 1. Close manual shutoff valve (see Fig- 1. Open manual shutoff valve (see Fig- ure 14). CHECKING GAS ure 14). 2. Pressurize supply piping system by either CONNECTIONS 2. Open main gas valve located on or near using compressed air or opening main gas gas meter. valve located on or near gas meter. WARNING: Test all gas pip- 3. Make sure co
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4 4 OWNER’S MANUAL Peg Groove INSTALLATION Rear Log (#3) in Back Continued of Log Front Log Groove (#1) in Back Notch INSTALLING LOGS Grate of Log Prong WARNING: Failure to posi- Rear tion the parts in accordance with Burner these diagrams or failure to use only parts specifically approved Grate with this heater may result in prop- Prongs erty damage or personal injury. Metal Grate Bar Grate Each log is marked with a number. These Figure 16- Installing Front Log (#1) Prong numbers will help you
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O N O T DESA INTERNATIONAL UNVENTED NATURAL GAS LOG HEATER 1. STOP! Read the safety information, LIGHTING OPERATING column 1. INSTRUCTIONS HEATER 2. Make sure manual shutoff valve is fully open. WARNING FOR YOUR SAFETY • If fireplace has glass doors, 3. Set selector switch in the OFF position. READ BEFORE never operate this heater with 4. Press in and turn control knob clock- LIGHTING glass doors closed. If you op- wise to the OFF position (see erate heater with doors closed, Figure 20). WAR
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OWNER’S MANUAL TO TURN OFF GAS MANUAL LIGHTING OPERATING TO APPLIANCE PROCEDURE HEATER 1. Follow steps 1 through 6 under Light- Shutting Off Heater Continued ing Instructions, page 14. 1. Turn control knob clockwise 8. Keep control knob pressed in for 30 2. Depress control knob and light pilot to the OFF position. seconds after lighting pilot. After 30 with match. 2a. Set selector switch in the OFF position. seconds, release control knob. 3. Keep control knob pressed in for 30 2b. If Using Opt
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P O F F O DESA INTERNATIONAL UNVENTED NATURAL GAS LOG HEATER minutes in the auto mode. It will not GHRC Operation: OPERATING respond immediately to the tempera- 2a. Press the ON/OFF button to turn the HEATER ture setting being turned up or down. burners on and off. When turning Continued IMPORTANT: The hand-held remote burners off, the pilot will remain lit. control unit must be near the heater. OPTIONAL REMOTE GHRCT Operation: Do not keep the hand-held remote OPERATION control unit too close to
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OWNER’S MANUAL If front burner flame pattern is incorrect, as FRONT BURNER FLAME INSPECTING shown in Figure 27 PATTERN BURNERS • turn heater off (see To Turn Off Gas to Figure 26 shows correct front burner flame Appliance, page 15) Check pilot flame pattern and burner flame pattern. Figure 27 shows incorrect front • see Troubleshooting, pages 19 through 21 patterns often. burner flame pattern. The incorrect burner flame pattern shows yellow tipping at top of PILOT FLAME PATTERN blue flame. Figur
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DESA INTERNATIONAL UNVENTED NATURAL GAS LOG HEATER 4. Check the injector holder located at the CLEANING AND REPLACEMENT end of the burner tube again. Remove MAINTENANCE any large particles of dust, dirt, lint, or PARTS pet hairs with a soft cloth or vacuum Note: Use only original replacement parts. cleaner nozzle. WARNING: Turn off heater This will protect your warranty coverage for 5. Blow air into the primary air holes on and let cool before cleaning. parts replaced under warranty. the inject
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OWNER’S MANUAL TROUBLESHOOTING WARNING: Turn off and un- CAUTION: Never use a wire, plug heater and let cool before needle, or similar object to clean Note: For additional help, visit DESA servicing. Only a qualified ser- ODS/pilot. This can damage ODS/ International’s Technical Service web vice person should service and pilot unit. site at www.desatech.com. repair heater. Note: All troubleshooting items are listed in order of operation. OBSERVED PROBLEM POSSIBLE CAUSE REMEDY When ignitor butto
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DESA INTERNATIONAL UNVENTED NATURAL GAS LOG HEATER TROUBLESHOOTING Continued OBSERVED PROBLEM POSSIBLE CAUSE REMEDY One or both burners do not light after ODS/ 1. Inlet gas pressure is too low 1. Contact local natural gas company pilot is lit 2. Burner orifice(s) clogged 2. Clean burner(s) (see Cleaning and Main- tenance, page 18) or replace burner orifice(s) 3. Mislocated crossover tube 3. Contact qualified service person 4. Burner orifice(s) diameter is too small 4. Replace burner orifice(s) 5
