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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
followed 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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Related Manuals for Design Dynamics VF-18N-MHD
Summary of Contents for 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 AND VF-24P-MHD WARNING: If the information in this manual is not followed 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
TABLE OF CONTENTS Safety ..............2 Cleaning and Maintenance ........ 20 Unpacking............4 Troubleshooting ..........21 Product Identification ........... 5 Wiring Diagram ..........24 Local Codes............5 Replacement Parts ..........25 Product Features ..........5 Service Hints ............. 25 Air For Combustion and Ventilation ..... 5 Technical Service.......... - Page 3 SAFETY Continued WARNING: This product con- WARNING: Do not allow fans tains and/or generates chemicals to blow directly into the heater. known to the State of California Avoid any drafts that alter burner to cause cancer or birth defects flame patterns. Ceiling fans can or other reproductive harm.
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Page 4: Unpacking
SAFETY Continued 1. This appliance is only for use with the type heated, the vapors from these products may of gas indicated on the rating plate. This create a white powder residue within burner appliance is not convertible for use with box or on adjacent walls or furniture. -
Page 5: Product Identification
PRODUCT IDENTIFICATION Log Set Assembly Control Valve with Hand-Held Remote Receiver Remote Control Module Chassis Assembly Figure 1 - Product Identification LOCAL CODES Install and use heater with care. Follow all State of Massachusetts: The installa- local codes. In the absence of local codes, tion must be made by a licensed plumber use the latest edition of The National Fuel or gas fitter in the Commonwealth of... - Page 6 AIR FOR COMBUSTION AND VENTILATION Continued While it is good to make your home energy effi- whose volume is less than 50 cubic feet per 1,000 Btu/hr (4.8 m per kw) of the aggregate cient, your home needs to breathe. Fresh air must input rating of all appliances installed in that enter your home.
- Page 7 AIR FOR COMBUSTION AND VENTILATION Continued Example: into adjoining room (see option 3, Figure 2). 40,000 Follow the National Fuel Gas Code, ANSI Gas water heater __________Btu/Hr 33,000 Z223.1/NFPA 54, Air for Combustion and Vent-free fireplace+ __________Btu/Hr Ventilation for required size of ventilation 73,000 Total= __________Btu/Hr...
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Page 8: Installation
INSTALLATION NOTICE: This heater is intended WARNING: Never install the for use as supplemental heat. heater Use this heater along with your • in a bedroom or bathroom primary heating system. Do not • in a recreational vehicle install this heater as your pri- •... - Page 9 INSTALLATION Continued B. Clearances from the top of the fireplace WARNING: This appliance is opening to the ceiling should not be less than 42". equipped for either natural gas or propane/LP gas but not both. Gas type is indicated on the rat- ing plate.
- Page 10 INSTALLATION Continued Noncombustible Requirements for Safe Installation Material Distance 12" or more Noncombustible material OK Between 8" and Install fire place hood accessory ( see 12" Accessories, page 25). Less than 8 Noncombustible material must be ex- tended to at least 8". See Between 8" and 12", above.
- Page 11 INSTALLATION Continued MANTEL CLEARANCES Combustible Material 14" In addition to meeting noncombustible mate- Min. rial clearances, you must also meet required clearances between fireplace openings and Noncombustible Material mantel shelf on each side of the fireplace. If Figure 8 - Minimum Fireplace Clearances you do not meet the clearances listed below, If Installed at Floor Level you will need a hood.
- Page 12 INSTALLATION Installation Items Needed Before installing heater, make sure you have Continued the items listed below. Installation Items Needed • external regulator (for propane/LP units • control cover kit (provided with heater) only, supplied by installer) • approved flexible gas hose (if allowed by •...
- Page 13 INSTALLATION Continued Installation must include an equipment shutoff where trapped matter is not likely to freeze. valve, union and plugged 1/8" NPT tap. Locate A sediment trap traps moisture and contami- NPT tap within reach for test gauge hook up. nants.
- Page 14 INSTALLATION 3. Check all joints from gas meter to equip- ment shutoff valve for natural gas or Continued propane/LP supply to equipment shutoff 4. Check all joints of gas supply piping system. valve for propane/LP (see Figure 14 or 15). Apply noncorrosive leak detection fluid to all Apply noncorrosive leak detection fluid to joints.
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Page 15: Operation
INSTALLATION Continued 4. Add lava rock and small decorative logs WARNING: Do not use rock around base of heater if desired (see Figure 17). You may place lava rock and wool or any other ember material log pieces up to flat burner. DO NOT not supplied with this unit. - Page 16 OPERATION Continued REMOTE LIGHTING WARNING: Burner will come INSTRUCTIONS on automatically within one min- WARNING: ute after pilot burner is lighted. • If fireplace has glass doors, 6. Press the buttons at the same never operate this heater with time. A short acoustic signal confirms start glass doors closed.
- Page 17 OPERATION Continued Shut Off Procedure The controller compares the room tem- To save battery power, press to turn main perature with set temperature and sends gas to pilot gas. Press the OFF button to a signal to the receiver to turn gas valve shut off the device including pilot flame.
- Page 18 OPERATION Continued MANUAL LIGHTING 11. Turn motor knob to adjust flame. Knob has a slipping clutch that allows manual flame PROCEDURE height adjustment as well as adjustment to pilot gas. WARNING: Manual lighting must be performed by a qualified Pilot Burner Thermocouple service person.
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Page 19: Inspecting Burners
INSPECTING BURNERS Check pilot flame pattern and burner flame BURNER FLAME PATTERN patterns often. Figure 23 shows correct burner flame pat- tern. PILOT FLAME PATTERN Figure 21 shows a correct pilot flame pattern. NOTICE: Do not mistake orange Figure 22 shows an incorrect pilot flame pat- flames with yellow tipping. -
Page 20: Cleaning And Maintenance
CLEANING AND 2 . Remove screws from left and right side of MAINTENANCE front log assembly to remove from base assembly (see Figure 25). 3. Inspect burner and primary air inlet holes WARNING: Turn off heater on injector holder of each burner for dust and let cool before cleaning. -
Page 21: Troubleshooting
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 POSSIBLE CAUSE REMEDY... - Page 22 TROUBLESHOOTING Continued OBSERVED PROBLEM POSSIBLE CAUSE REMEDY 1. Manifold pressure is too 1. Contact local natural or Delayed ignition burner propane/LP gas company 2. Clean burner (see Cleaning 2. Burner orifice(s) clogged and Maintenance, page 20) or replace burner orifice 1.
- Page 23 TROUBLESHOOTING Continued 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
TROUBLESHOOTING Continued IDENTIFYING ERROR SIGNALS FROM RECEIVER OBSERVED PROBLEM POSSIBLE CAUSE REMEDY Long signals (0.8 second Battery nearly down. (When Replace battery tone, 0.2 second break) dur- signal appears the first time ap- ing ignition proximately 10 ignitions left) 5 second continuous tone Cable is not connected, ON/OFF Connect cables switch is in OFF position... -
Page 25: Replacement Parts
REPLACEMENT PARTS Note: Use only original replacement parts. Usually, we will ask you to return the part to This will protect your warranty coverage for the factory. parts replaced under warranty. PARTS NOT UNDER WARRANTY PARTS UNDER WARRANTY Contact authorized dealers of this product. If Contact authorized dealers of this product. -
Page 26: Parts
PARTS MODELS VF-18N-MHD, VF-18P-MHD, VF-24N-MHD AND VF-24P-MHD www.desatech.com 116986-01F... - Page 27 PARTS 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 DESCRIPTION QTY. 116950-01 116950-01 116805-01 116805-01 Base 116853-02...
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Page 28: Warranty
WARRANTY KEEP THIS WARRANTY Model (located on product or identification tag) _____________________________ Serial No. (located on product or identification tag) __________________________ Date Purchased __________________________ Keep receipt for warranty verification. DESA HEATING, LLC LIMITED WARRANTIES New Products Standard Warranty: DESA Heating, LLC warrants this new product and any parts thereof to be free from defects in material and workmanship for a period of four (4) years from the date of first purchase from an authorized dealer provided the product has been installed, maintained and operated in accordance with DESA Heating, LLC’s warnings and instructions.
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