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UNVeNTed (VeNT-FRee) Gas loG HeaTeR
oWNeR's oPeRaTIoN aNd INsTallaTIoN MaNUal
Models VF-18N-MHd, VF-18P-MHd, VF-24N-MHd
WARNING: If the information in this manual is not fol-
lowed 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 quali-
fied installer, service agency or the gas supplier.
INSTALLER: Leave this manual with the appliance.
CONSUMER: Retain this manual for future reference.
For more information, visit www.desatech.com
aNd VF-24P-MHd
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Summary of Contents for Desa Design Dynamics VF-18N-MHD
- Page 1 UNVeNTed (VeNT-FRee) Gas loG HeaTeR oWNeR’s oPeRaTIoN aNd INsTallaTIoN MaNUal Models VF-18N-MHd, VF-18P-MHd, VF-24N-MHd WARNING: If the information in this manual is not fol- lowed exactly, a fire or explosion may result causing property damage, personal injury or loss of life.
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Page 2: Table Of Contents
WARNING: Improper installation, adjustment, altera- tion, service or maintenance can cause injury or prop- erty damage. Refer to this manual for correct installation and operational procedures. For assistance or addi- tional information consult a qualified installer, service agency or the gas supplier. WARNING: This appliance is for installation only in a solid-fuel burning masonry or UL127 factory-built fire- place or in a listed ventless firebox enclosure. -
Page 3: Safety Information
saFeTy INFoRMaTIoN WARNING: This product con- tains and/or generates chemicals known to the State of California to cause cancer or birth defects or other reproductive harm. IMPORTANT: Read this owner’s manual carefully and completely before trying to assemble, operate or service this heater. Improper use of this heater can cause serious injury or death from burns, fire, explosion,... -
Page 4: Product Identification
saFeTy INFoRMaTIoN Continued 1. 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. 2. Do not place propane/LP supply tank(s) in- side any structure. Locate propane/LP supply tank(s) outdoors (propane/LP units only). -
Page 5: Local Codes
loCal Codes Install and use heater with care. Follow all local codes. In the absence of local codes, use the lat- est edition of The National Fuel Gas Code ANSI Z223.1/NFPA 54*. *Available from: American National Standards Institute, Inc. 1430 Broadway New York, NY 10018 National Fire Protection Association, Inc. -
Page 6: Air For Combustion
Example: 2,560 cu. ft. (volume of space) x 20 = 51,200 (maximum Btu/Hr the space can support) Add the Btu/Hr of all fuel burning appliances in the space. Vent-free fireplace Gas water heater* Gas furnace Vented gas heater Gas fireplace logs Other gas appliances* + ____________Btu/Hr Total * Do not include direct-vent gas appliances. -
Page 7: Combustion And Ventilation Air
aIR FoR CoMBUsTIoN aNd VeNTIlaTIoN Continued If the actual Btu/Hr used is less than the maximum Btu/Hr the space can support, the space is an uncon- fined space. You will need no additional fresh air ventilation. WARNING: If the area in which the heater may be oper- ated is smaller than that defined as an unconfined space or if the... -
Page 8: Installation
INsTallaTIoN NOTICE: This heater is intended for use as supplemental heat. Use this heater along with your primary heating system. Do not install this heater as your pri- mary heat source. If you have a central heating system, you may run system’s circulating blower while using heater. - Page 9 INsTallaTIoN Continued INSTALLATION AND CLEARANCES FOR VENT-FREE OPERATION WARNING: Maintain the minimum clearances. If you can, provide greater clearances from floor, ceiling and adjoining wall. MINIMUM FIREPLACE CLEARANCE TO COMBUSTIBLE MATERIALS Log Size Side Wall Ceiling Floor LOG SIZING REQUIREMENTS Minimum Firebox Size Height Depth Size...
- Page 10 Noncombustible Requirements for Safe Installation Material Distance 1" or more Noncombustible material OK Between 8" and Install fire place hood accessory ( see 1" Accessories, page 5). Less than 8 Noncombustible material must be ex- tended to at least 8". See Between 8" and 12", above.
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Page 11: Mantel Clearances
INsTallaTIoN Continued MANTEL CLEARANCES In addition to meeting noncombustible material clearances, you must also meet required clearances between fireplace openings and mantel shelf on each side of the fireplace. If you do not meet the clearances listed below, you will need a hood. Determining Minimum Mantel Clearance If you meet minimum clearance between mantel shelf and top of fireplace opening, a hood is not... -
Page 12: Connecting To Gas Supply
INsTallaTIoN Continued Installation Items Needed • control cover kit (provided with heater) • approved flexible gas hose (if allowed by local codes) • sealant (resistant to propane/LP gas, not provided) 1. Apply pipe joint sealant lightly to male threads of gas fitting (not provided). Connect approved flexible gas hose to inlet side of gas control (see Figure 10). -
Page 13: Checking Gas Connections
INsTallaTIoN Continued Installation must include an equipment 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 12). IMPORTANT: Install equipment shutoff valve in an accessible location. - Page 14 INsTallaTIoN Continued 4. Check all joints of gas supply piping system. Apply noncorrosive leak detection fluid to all joints. Bubbles forming show a leak. 5. Correct all leaks at once. 6. Reconnect heater and equipment shutoff valve to gas supply. Check reconnected fit- tings for leaks.
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Page 15: Operating Heater
INsTallaTIoN Continued 4. Add lava rock and small decorative logs around base of heater if desired. You may place lava rock and log pieces up to flat burner. DO NOT place rock or logs on front burner or on logs. Placing any material on unit other than ember material on front burner may result in production of carbon monoxide or soot. -
Page 16: Functions Of Remote Control
oPeRaTING HeaTeR Continued 6. Press the buttons time. A short acoustic signal confirms the start sequence has begun. Further short acoustic signals (0.2 sec., 1 Hz) indicate the ignition process until it is com- pleted and main gas flows. If pilot is already lit, motor will turn on (max. -
Page 17: Manual Lighting Procedure
oPeRaTING HeaTeR Continued • Timer: The timer mode (TIMER) operates much like the temperature mode above. The timer setting allows you to set specific times for on and off. (There are 2 burner on and 2 burner off cycles every 24 hours.) If the reading for the nighttime temp. -
Page 18: To Turn Gas Off To Appliance
oPeRaTING HeaTeR Continued Lighting with Piezo Ignitor 1. Disconnect ignitor cable from receiver and connect to Piezo Ignitor Tab (see Figure 18, page 17 and Wiring Diagram on page 24). 2. STOP! Read safety information on page 15, 3. Make sure equipment shutoff valve is fully open. -
Page 19: Burner Flame Pattern
INsPeCTING BURNeRs Continued BURNER FLAME PATTERN Figure 22 shows correct burner flame pattern. NOTICE: Do not mistake orange flames with yellow tipping. Dirt or other fine particles are burned by heater, causing brief patches of orange flame. If burner flame pattern is incorrect, as shown in Figure 23 •... - Page 20 CleaNING aNd MaINTeNaNCe Continued 1. Remove two screws from back of unit that attach main log assembly to base assembly (see Figure 24). 2 . Remove screws from left and right side of front log assembly to remove from base as- sembly (see Figure 24).
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Page 21: Troubleshooting
WARNING: Turn off heater and let cool before servicing. Only a qualified service person should service and repair heater. CAUTION: Never use a wire, needle or similar object to clean ODS/pilot. This can damage ODS/pilot unit. Note: All troubleshooting items are listed in order of operation. OBSERVED PROBLEM When are pressed at... - Page 22 OBSERVED PROBLEM Burner backfiring during com- bustion Orange flame in burner during burner combustion Slight smoke or odor during initial operation (first hour) Heater produces a whistling noise when burner is lit White powder residue forming within burner box or on adjacent walls or furniture Moisture/condensation noticed on windows...
- Page 23 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 building. • Immediately call your gas supplier from a neighbor’s phone. Fol- low the gas supplier’s instructions.
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Page 24: Wiring Diagram
IDENTIFYING ERROR SIGNALS FROM RECEIVER OBSERVED PROBLEM Long signals (0.8 second tone, 0.2 second break) during ignition 5 second continuous tone 5 short signals (8.2 second tone, 0.2 second break) Thermocouple Battery Compartment TRoUBlesHooTING Continued POSSIBLE CAUSE Battery nearly down. (When signal appears the first time ap- proximately 10 ignitions left) Cable is not connected, ON/OFF... -
Page 25: Replacement Parts
You may have further questions about installation, operation, or troubleshooting. If so, contact DESA’s Technical Service Department at 1-866-672-6040. When calling please have your model and serial numbers of your appliance ready. You can also visit DESA’s technical services web site at www.desatech.com 116986-01B aCCessoRIes Purchase these heater accessories from your local dealer. -
Page 26: Illustrated Parts Breakdown
IllUsTRaTed PaRTs BReakdoWN MODELS VF-18N-MHD, VF-18P-MHD, VF-24N-MHD AND VF-24P-MHD www.desatech.com 116986-01B... -
Page 27: Parts List
This list contains replaceable parts used in your heater. When ordering parts, follow the instructions listed under Replacement Parts on page 25 of this manual. PART NUMBER VF-18N-MHD VF-18P-MHD VF-24N-MHD VF-24P-MHD 116950-01 116950-01 116853-0 116853-0 116943-0 116943-01 116951-01 116951-01 11695-01... -
Page 28: Limited Warranty
VeNT-FRee Gas loG HeaTeRs DESA warrants this product to be free from defects in materials and components for four (4) years from the date of first purchase, provided that the product has been properly installed, operated and maintained in accordance with all applicable instructions.
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