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Remote-Ready Models Also Design-Certified As Vented
WARNING: If the information in this manual
is not followed exactly, a fire or explosion
may result causing property damage, per-
sonal 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 qualified installer, service agency, or
the gas supplier.
WARNING: This is an unvented gas-fired heater. It uses air (oxygen) from the room in which
it is installed. Provisions for adequate combustion and ventilation air must be provided. Refer
to Air for Combustion and Ventilation section on page 5 of this manual.
This appliance may be installed in an aftermarket,* permanently located, manufactured
(mobile) home, where not prohibited by local codes.
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.
* Aftermarket: Completion of sale, not for purpose of resale, from the manufacturer
Save this manual for future reference.
Save this manual for future reference.
UNVENTED (VENT-FREE) GAS LOG HEATER
TM
OWNER'S OPERATION AND INSTALLATION MANUAL
Decorative Appliances
24" and 30"Remote-Ready
24" and 30" Thermostat-
WARNING: Improper installation, adjust-
ment, alteration, service, or maintenance
can cause injury or property damage. Refer
to this manual for correct installation and
operational procedures. For assistance or
additional information consult a qualified
installer, service agency, or the gas supplier.
WARNING: This appliance is for installa-
tion only in a solid-fuel burning masonry or
UL127 factory-built fireplace, or in an ap-
proved ventless firebox. It is design-certi-
fied for these installations in accordance
with ANSI Z21.11.2. Exception: Do not in-
stall this appliance in a factory-built fire-
place that includes instructions stating it
has not been tested or should not be used
with unvented gas logs. For unmarked fac-
tory-built fireplaces, contact fireplace manu-
facturer if unsure of this application.
Controlled
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Table of Contents
Related Manuals for Desa 70,000 Btu/Hr
Summary of Contents for Desa 70,000 Btu/Hr
- Page 1 UNVENTED (VENT-FREE) GAS LOG HEATER OWNER’S OPERATION AND INSTALLATION MANUAL For more information, visit www.desatech.com For more information, visit www.desatech.com 24" and 30"Remote-Ready 24" and 30" Thermostat- Controlled Remote-Ready Models Also Design-Certified As Vented Decorative Appliances WARNING: Improper installation, adjust- WARNING: If the information in this manual ment, alteration, service, or maintenance is not followed exactly, a fire or explosion...
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Page 2: Table Of Contents
TABLE OF CONTENTS SAFETY INFORMATION TABLE OF CONTENTS SAFETY INFORMATION ............2 TROUBLESHOOTING .............. 25 PRODUCT IDENTIFICATION ............. 4 OPTIONAL POSITIONING OF THERMOSTAT OPTIONAL REMOTE CONTROL ACCESSORIES ....4 SENSING BULB ..............28 LOCAL CODES ................4 SPECIFICATIONS ..............29 UNPACKING ................ - Page 3 SAFETY INFORMATION SAFETY INFORMATION Continued 9. This heater needs fresh, outside air ventilation to run properly. Carefully supervise young children when they are in This heater has an Oxygen Depletion Sensing (ODS) safety the room with heater. When using the hand-held shutoff system.
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Page 4: Product Identification
PRODUCT IDENTIFICATION OPTIONAL REMOTE CONTROL ACCESSORIES LOCAL CODES UNPACKING PRODUCT IDENTIFICATION OPTIONAL REMOTE CONTROL ACCESSORIES Log Set (Varies According to Model) There are four optional remote controls that can be purchased separately for Remote-Ready Models Only: • wall switch • hand-held ON/OFF remote •... -
Page 5: Product Features
PRODUCT FEATURES Operation Safety Device Piezo Ignition System AIR FOR COMBUSTION AND VENTILATION Providing Adequate Ventilation PRODUCT FEATURES OPERATION PROVIDING ADEQUATE VENTILATION This heater is clean burning. It requires no outside venting. There is The following are excerpts from National Fuel Gas Code, ANSI no heat loss out a vent or up a chimney. - Page 6 AIR FOR COMBUSTION AND VENTILATION Determining Fresh-Air Flow For Heater Location AIR FOR COMBUSTION AND VENTILATION Continued DETERMINING FRESH-AIR FLOW FOR The space in the above example is a confined space because the actual Btu/ Hr used is more than the maximum Btu/Hr the space can support. You must HEATER LOCATION provide additional fresh air.
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Page 7: Ventilation Air
AIR FOR COMBUSTION AND VENTILATION Ventilation Air AIR FOR COMBUSTION AND VENTILATION Continued VENTILATION AIR Ventilation Air From Inside Building 12" This fresh air would come from an adjoining unconfined space. When ventilating to an adjoining unconfined space, you must Ventilation provide two permanent openings: one within 12"... -
Page 8: Installation
INSTALLATION Check Gas Type Installation and Clearances For Vent-Free Operation INSTALLATION NOTICE: This heater is intended for use as supple- CAUTION: This heater creates warm air currents. mental heat. Use this heater along with your primary These currents move heat to wall surfaces next to heating system. - Page 9 INSTALLATION Installation and Clearances For Vent-Free Operation (Cont.) INSTALLATION Continued Carefully follow the instructions below. This will ensure safe If Using Mantel installation into a masonry, UL127-listed manufactured fireplace, You must have noncombustible material(s) above the fireplace or listed vent-free firebox. opening.
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Page 10: Mantel Clearances
INSTALLATION Mantel Clearances Floor Clearances INSTALLATION Continued MANTEL CLEARANCES Mantel Shelf 10" Underside of 8" In addition to meeting noncombustible material clearances, you Mantel Shelf 6" must also meet required clearances between fireplace opening and 1 /2 " mantel shelf. If you do not meet the clearances listed below, you will need a hood. -
Page 11: Installing Damper Clamp Accessory For Vented Operation
INSTALLATION Installing Damper Clamp Accessory For Vented Operation Installing Heater Base Assembly INSTALLATION Continued INSTALLING DAMPER CLAMP ACCESSORY INSTALLING HEATER BASE ASSEMBLY FOR VENTED OPERATION WARNING: You must secure this heater to fire- (Remote-Ready Models Only) place floor. If not, heater will move when you adjust Note: When used as a vented heater, appliance must be installed controls. -
Page 12: Connecting To Gas Supply
INSTALLATION Installing Heater Base Assembly (Cont.) Connecting To Gas Supply INSTALLATION Continued CONNECTING TO GAS SUPPLY Locate two masonry screws in hardware package. Place heater base in fireplace. WARNING: This appliance requires a 1/2" NPT Place logs in their proper position on heater base (see Installing (National Pipe Thread) inlet connection to the pres- Logs, pages 15 through 17). - Page 13 INSTALLATION Connecting To Gas Supply (Cont.) INSTALLATION Continued Installation must include an equipment shutoff valve, union, and CSA Design-Certified Equipment Shutoff Valve With 1/8" NPT Tap* plugged 1/8" NPT tap. Locate NPT tap within reach for test gauge PROPANE/LP - From External hook up.
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Page 14: Checking Gas Connections
INSTALLATION Checking Gas Connections INSTALLATION Continued CHECKING GAS CONNECTIONS Pressure Testing Heater Gas Connections 1. Open equipment shutoff valve (see Figure 16). WARNING: Test all gas piping and connections, 2. Open main gas valve located on or near gas meter for natural internal and external to unit, for leaks after installing gas or open propane/LP supply tank valve. -
Page 15: Installing Logs
INSTALLATION Installing Logs INSTALLATION Continued INSTALLING LOGS WARNING: Failure to position the parts in accor- dance with these diagrams or failure to use only parts specifically approved with this heater may result in property damage or personal injury. CAUTION: After installation and periodically there- after, check to ensure that no yellow flame comes in contact with any log. - Page 16 INSTALLATION Installing Logs (Cont.) INSTALLATION Continued Models VGX24NT, VGX24PT, VGX30NT, VGX30PT, VGX24NR, VGX24PR, VGX30NR, VGX30PR, EX24NR, EX24PR, EX30NR AND EX30PR Place log #1 (ember bed) onto the base. Position the log over the shoulder bolts on either side of the front burner. The log will sit on top of the front burner (see Figure 23).
- Page 17 INSTALLATION Installing Logs (Cont.) INSTALLATION Continued Models LGX3924NT and LGX3924PT Place log #1 (ember bed) onto the base. Position the log over the shoulder bolts on either side of the front burner. The log will sit on top of the front burner (see Figure 28). Place log #2 behind the back burner and onto the two back tabs as shown in Figure 29.
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Page 18: Operating Heater
INSTALLATION Attaching Grate To Base Assembly OPERATING HEATER (THERMOSTAT-CONTROLLED MODELS) For Your Safety Read Before Lighting Lighting Instructions INSTALLATION OPERATING HEATER Continued THERMOSTAT-CONTROLLED MODELS ATTACHING GRATE TO BASE ASSEMBLY Locate the two slots in the front of the base assembly. Carefully slide FOR YOUR SAFETY READ the decorative grate into these slots (see Figure 33). -
Page 19: Operating Heater
OPERATING HEATER (THERMOSTAT-CONTROLLED MODELS) Lighting Instructions (Cont.) To Turn Off Gas To Appliance OPERATING HEATER Continued Note: Home owners generally prefer to operate their heater Control Knob Ignitor Button Rear Burner with the chimney damper closed. This will put all the heat into Control Knob the room. -
Page 20: Operation Instructions
OPERATING HEATER (THERMOSTAT-CONTROLLED MODELS) Thermostat Control Manual Lighting Procedure OPERATING HEATER (REMOTE-READY MODELS) For Your Safety Read Before Lighting Lighting Instructions OPERATING HEATER Continued THERMOSTAT CONTROL LIGHTING OPERATION INSTRUCTIONS The thermostat control knob can be set to any comfort level WARNING: between Hi and Lo. - Page 21 OPERATING HEATER (REMOTE-READY MODELS) Lighting Instructions (Cont.) To Turn Off Gas To Appliance Manual Lighting Procedure OPERATING HEATER Continued With control knob pressed in, press and release ignitor but- Ignitor Electrode Pilot Burner Ignitor ton. This will light pilot. The pilot is attached to the front Thermocouple Electrode burner.
- Page 22 OPERATING HEATER (REMOTE-READY MODELS) Optional Remote Operation OPERATING HEATER Continued • In the AUTO mode, the thermostat in the hand-held re- OPTIONAL REMOTE mote unit controls the room temperature. To increase the OPERATION room temperature, press the top arrow of the TEMP but- ton.
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Page 23: Inspecting Burners
INSPECTING BURNERS Flame Pattern Front Burner Flame Pattern INSPECTING BURNERS FRONT BURNER FLAME PATTERN Check pilot flame pattern and burner flame patterns often. PILOT FLAME PATTERN Figure 44 shows correct front burner flame pattern. Figure 45 shows incorrect front burner flame pattern. The incorrect burner flame Figure 42 shows a correct pilot flame pattern. -
Page 24: Cleaning And Maintenance
CLEANING AND MAINTENANCE CLEANING AND MAINTENANCE Injector Holder WARNING: Turn off heater and let cool before cleaning. Burner Tube CAUTION: You must keep control areas, burners, Primary Air and circulating air passageways of heater clean. In- Inlet Holes spect these areas of heater before each use. Have heater inspected yearly by a qualified service person. -
Page 25: Troubleshooting
TROUBLESHOOTING TROUBLESHOOTING CAUTION: Never use a wire, WARNING: Turn off heater needle, or similar object to clean and let cool before servicing. Only Note: For additional help, visit DESA ODS/pilot. This can damage ODS/ a qualified service person should International’s technical service web pilot unit. - Page 26 TROUBLESHOOTING TROUBLESHOOTING 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 or propane/LP gas pilot is lit company 2. Burner orifice(s) clogged 2.
- Page 27 TROUBLESHOOTING 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. Follow the gas supplier’s instructions.
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Page 28: Optional Positioning Of Thermostat Sensing Bulb
OPTIONAL POSITIONING OF THERMOSTAT SENSING BULB (THERMOSTAT-CONTROLLED MODELS ONLY) For Masonry and Factory-Built Metal Fireplace OPTIONAL POSITIONING OF THERMOSTAT SENSING BULB Thermostat Sensing Bulb (THERMOSTAT-CONTROLLED MODELS ONLY) FOR MASONRY AND FACTORY-BUILT METAL FIREPLACE If your log set cycles to pilot, but the room temperature drops to a Adhesive- lower than ideal comfort level before the log set comes back on, you backed... -
Page 29: Specifications
SPECIFICATIONS WIRING DIAGRAM (REMOTE-READY MODELS ONLY) SERVICE HINTS TECHNICAL SERVICE SPECIFICATIONS 24" Thermostat-Controlled 24" Thermostat-Controlled 30" Thermostat-Controlled LGX3924PT LGX3924NT Btu (Variable) 10,000/39,000 10,000/39,000 20,000/39,000 20,000/39,000 10,000/39,000 10,000/39,000 Type Gas Propane/LP Natural Propane/LP Natural Propane/LP Natural Ignition Piezo Piezo Piezo Piezo Piezo Piezo Manifold Pressure... -
Page 30: Illustrated Parts Breakdown And Parts List
ILLUSTRATED PARTS BREAKDOWN VGX24NR, VGX24PR, VGX30NR, VGX30PR VGX24NT, VGX24PT, VGX30NT, VGX30PT EX24NR, EX24PR, EX30NR, EX30PR CGX3924NR, CGX3924PR, CGX3924NT, CGX3924PT, CGX3930NT, CGX3930PT LGX3924NT, LGX3924PT ILLUSTRATED PARTS BREAKDOWN LOGS SETS Log Set for Models: VGX24NR, VGX24PR, VGX30NR, VGX30PR, VGX24NT, VGX24PT, VGX30NT, VGX30PT, EX24NR, EX24PR, EX30NR and EX30PR Log Set for Models: LGX3924NT and... -
Page 31: Parts List
PARTS LIST VGX24NR, VGX24PR, VGX30NR, VGX30PR VGX24NT, VGX24PT, VGX30NT, VGX30PT EX24NR, EX24PR, EX30NR, EX30PR CGX3924NR, CGX3924PR, CGX3924NT, CGX3924PT, CGX3930NT, CGX3930PT LGX3924NT, LGX3924PT PARTS LIST This list contains replaceable parts used in your heater. When ordering parts, follow the instructions listed under Replacement Parts on page 38 of this manual. - Page 32 ILLUSTRATED PARTS BREAKDOWN Thermostat-Controlled Models VGX24NT, VGX24PT, VGX30NT, VGX30PT CGX3924NT, CGX3924PT, CGX3930NT, CGX3930PT ILLUSTRATED PARTS BREAKDOWN THERMOSTAT-CONTROLLED MODELS VGX24NT, VGX24PT VGX30NT, VGX30PT CGX3924NT, CGX3924PT CGX3930NT, CGX3930PT Natural Gas Models Only 20 27 For more information, visit www.desatech.com For more information, visit www.desatech.com 108114-01D...
- Page 33 PARTS LIST Thermostat-Controlled VGX24NT, VGX24PT, VGX30NT, VGX30PT CGX3924NT, CGX3924PT, CGX3930NT, CGX3930PT PARTS LIST THERMOSTAT-CONTROLLED MODELS This list contains replaceable parts used in your heater. When ordering parts, follow the instructions listed under Replacement Parts on page 38 of this manual. PART NUMBER FOR KEY VGX24NT VGX24PT...
- Page 34 ILLUSTRATED PARTS BREAKDOWN Remote-Ready Models VGX24NR, VGX24PR, VGX30NR, VGX30PR EX24NR, EX24PR, EX30NR, EX30PR CGX3924NR, CGX3924PR ILLUSTRATED PARTS BREAKDOWN REMOTE-READY MODELS VGX24NR, VGX24PR VGX30NR, VGX30PR EX24NR, EX24PR EX30NR, EX30PR CGX3924NR, CGX3924PR Natural Gas Models Only 20 27 Natural Gas Models Only For more information, visit www.desatech.com For more information, visit www.desatech.com 108114-01D...
- Page 35 PARTS LIST Remote-Ready Models VGX24NR, VGX24PR, VGX30NR, VGX30PR EX24NR, EX24PR, EX30NR, EX30PR CGX3924NR, CGX3924PR PARTS LIST REMOTE-READY MODELS This list contains replaceable parts used in your heater. When ordering parts, follow the instructions listed under Replacement Parts on page 38 of this manual. PART NUMBER FOR VGX24NR VGX30NR...
- Page 36 ILLUSTRATED PARTS BREAKDOWN Thermostat-Controlled Models LGX3924NT, LGX3924PT ILLUSTRATED PARTS BREAKDOWN THERMOSTAT-CONTROLLED MODELS LGX3924NT, LGX3924PT Natural Gas Models Only For more information, visit www.desatech.com For more information, visit www.desatech.com 108114-01D...
- Page 37 PARTS LIST Thermostat-Controlled Models LGX3924NT, LGX3924PT PARTS LIST THERMOSTAT-CONTROLLED MODELS This list contains replaceable parts used in your heater. When ordering parts, follow the instructions listed under Replacement Parts on page 38 of this manual. PART NUMBER LGX3924NT LGX3924PT DESCRIPTION QTY.
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Page 38: Replacement Parts
REPLACEMENT PARTS ACCESSORIES REPLACEMENT PARTS Note: Use only original replacement parts. This will protect your warranty coverage for parts replaced under warranty. PARTS UNDER WARRANTY Contact authorized dealers of this product. If they can’t supply RECEIVER AND HAND-HELD THERMOSTAT original replacement part(s), call DESA International’s Technical Service Department at 1-866-672-6040. -
Page 39: Owner's Registration Form
OWNER'S REGISTRATION FORM In order to provide better customer service for this and future purchases, we recommend that you register your product with us. You can register online at www.desatech.com. If access to our website is not available to you, please complete this Owner’s Registration Form and mail to the address on the back of this owner’s manual. - Page 40 Postage Required 2701 Industrial Drive P.O. Box 90004 Bowling Green, KY 42102-9004 For more information, visit www.desatech.com For more information, visit www.desatech.com 108114-01D TAPE...
- Page 41 NOTES NOTES _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ For more information, visit www.desatech.com For more information, visit www.desatech.com 108114-01D...
- Page 42 2701 Industrial Drive P.O. Box 90004 Bowling Green, KY 42102-9004 www.desatech.com 108114 01 108114-01 NOT A UPC Rev. D 01/03 For more information, visit www.desatech.com For more information, visit www.desatech.com 108114-01D...