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DESA INTERNATIONAL
UNVENTED (VENT-FREE)
NATURAL GAS LOG HEATER
Variable Manually-Controlled Models Also Design-Certified As Vented
Decorative Appliances
OWNER’S OPERATION AND INSTALLATION MANUAL
18", 24", and 30"
(“C” Models) Variable
Manually-Controlled,
and (“B” Models)
®
Thermostatically-
LO
PILOT
Controlled
OFF
HI
WARNING: Improper installation, ad-
WARNING: If the information in this
justment, alteration, service, or main-
manual is not followed exactly, a fire or
tenance can cause injury o
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DESA INTERNATIONAL UNVENTED NATURAL GAS LOG HEATER 2. If you smell gas 10. Do not allow fans to blow directly into SAFETY • shut off gas supply the fireplace. Avoid any drafts that al- INFORMATION • do not try to light any appliance ter burner flame patterns. Ceiling fans • do not touch any electrical switch; do may create drafts that alter burner flame not use any phone in your building patterns. Altered burner patterns can WARNINGS • immediately call your gas supplier cause sooting. from a n
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OWNER’S MANUAL PRODUCT PRODUCT IDENTIFICATION FEATURES OPERATION Crossover Log Rear Log This heater is clean burning. It requires no outside venting. There is no heat loss out a vent or up a chimney. Heat is generated by Front both realistic flames and glowing coals. Branch This heater is designed for vent-free opera- tion with flue damper closed. It has been tested and approved to ANS Z21.11.2 stan- dard for unvented heaters. State and local codes in some areas prohibit the use of vent- free h
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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 = __________________ c
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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: Never install the CLEARANCES heater (Vent-Free Operation Only) NOTICE: This heater is intended • in a bedroom or bathroom un- for use as supplemental heat. Use less installed as a vented ap- this heater along with your pri- pliance, see page 10 (Variable WARNING: Maintain the mini- mary heating system. Do not in- Manually-Controlled models mum clearances. If you can, pro- stall this heater as your primary only) vide greater clearances from
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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" Underside of Continued 8" Mantel Shelf 6" MANTEL CLEARANCES 1 2 /2" In addition to meeting noncombustible mate- rial clearances, you must also meet required All minimum distances are clearances between fireplace opening and in inches mantel shelf. If you do not meet the clear- Minimum Non- ances losted below, you will need a hood. (A) Combustible Log Set Material 12" 18" 20" 22" 24" 24"/30" Models Determining Minimum Mantel 3 1 8" 14" 16 / " 18 /
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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 product. Masonry Fireplace Manufactured Fireplace There are three reason
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OWNER’S MANUAL CONNECTING TO GAS CAUTION: Use only new, INSTALLATION SUPPLY black iron or steel pipe. Inter- Continued nally-tinned copper tubing may WARNING: A qualified service be used in certain areas. Check 8. Reattach heater base to mounting person must connect heater to gas your local codes. Use pipe of 1/2" brackets. Tighten nuts firmly. supply. Follow all local codes. diameter or greater to allow 9. Connect to gas supply. See Connect- proper gas volume to heater. If ing To Gas Supply.
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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 ei- CONNECTIONS 2. Open main gas valve located on or near ther using compressed air or opening gas meter. main gas valve located on or near gas WARNING: Test all gas pip- 3. Make sure control
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OWNER’S MANUAL Notch Rear Log (#3) Groove in INSTALLATION Back of Log Peg Continued Front Log (#1) Groove in Back INSTALLING LOGS of Log Grate 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- Prong Grate erty damage or personal injury. Prongs Each log is marked with a number. These Metal Grate Bar numbers will help you identify the log when installing. It i
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DESA INTERNATIONAL UNVENTED NATURAL GAS LOG HEATER 4. Wait five (5) minutes to clear out any LIGHTING OPERATING gas. Then smell for gas, including INSTRUCTIONS HEATER near the floor. If you smell gas, STOP! Follow “B” in the safety in- WARNING: Thermostat-Controlled formation above. If you don’t smell • If fireplace has glass doors, gas, go to the next step. Models never operate this heater with 5. Turn control knob counterclockwise glass doors closed. If you op- FOR YOUR SAFETY C-clockwise to
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OWNER’S MANUAL Manually-Controlled Models LIGHTING OPERATING INSTRUCTIONS HEATER FOR YOUR SAFETY READ BEFORE Continued WARNING: LIGHTING • If fireplace has glass doors, never operate this heater with CAUTION: Do not try to adjust glass doors closed. If you op- WARNING: If you do not fol- heating levels by using the erate heater with doors closed, low these instructions exactly, a manual shutoff valve. heat buildup inside fireplace fire or explosion may result caus- will cause glass to burst.
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DESA INTERNATIONAL UNVENTED NATURAL GAS LOG HEATER 7. Keep control knob pressed in for 30 TO TURN OFF GAS OPERATING seconds after lighting pilot. After 30 TO APPLIANCE HEATER seconds, release control knob. Shutting Off Heater • If control knob does not pop out Continued when released, contact a qualified 1. Press in and turn control knob clock- service person or gas supplier for Clockwise 4. Wait five (5) minutes to clear out any wise to the HIGH position. repairs. gas. Then smell for gas, inc
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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 [thermostat-con- Check pilot flame pattern and burner flame pattern. Figure 27 shows incorrect front trolled models] or page 16 [manually- patterns often. burner flame pattern. The incorrect burner controlled models]) flame pattern shows yellow tipping at top of PILOT
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DESA INTERNATIONAL UNVENTED NATURAL GAS LOG HEATER 3. Blow air through the ports/slots and LOGS CLEANING AND holes in the burner. • If you remove logs for cleaning, refer to MAINTENANCE 4. Check the injector holder located at the Installing Logs, page 13, to properly re- end of the burner tube again. Remove place logs. any large particles of dust, dirt, lint, or WARNING: Turn off heater • Replace log(s) if broken or chipped pet hairs with a soft cloth or vacuum and let cool before cleaning. (di
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OWNER’S MANUAL TROUBLESHOOTING CAUTION: Never use a wire, WARNING: Turn off and un- needle, or similar object to clean plug heater and let cool before Note: For additional help, visit DESA ODS/pilot. This can damage ODS/ servicing. Only a qualified ser- 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
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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) 1
