Desa CDR3924PT Owner's Operation And Installation Manual
Unvented (vent-free) gas log heater 24" thermostat
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UNVENTED (VENT-FREE) GAS LOG HEATER
OWNER'S OPERATION AND INSTALLATION MANUAL
24" THERMOSTAT MODELS CDR3924NT AND CDR3924PT
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.
For more information, visit www.desatech.com
Save this manual for future reference.
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Table of Contents
Related Manuals for Desa CDR3924PT
Summary of Contents for Desa CDR3924PT
- Page 1 UNVENTED (VENT-FREE) GAS LOG HEATER OWNER’S OPERATION AND INSTALLATION MANUAL 24" THERMOSTAT MODELS CDR3924NT AND CDR3924PT 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 an listed ventless firebox enclosure. -
Page 3: Safety Information
SAFETY INFORMATION WARNING: This product contains and/or generates chemicals known to the State of California to cause cancer or birth defects, or other reproduc- tive harm. IMPORTANT: Read this owner’s manual carefully and completely before trying to assemble, op- erate, or service this heater. Improper use of this heater can cause property damage and... -
Page 4: Local Codes
SAFETY INFORMATION Continued 1. This appliance is only for use with the type of gas indicated on the rating plate. This ap- pliance 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. -
Page 5: Product Identification
PRODUCT IDENTIFICATION Log Set Ignitor Base Assembly 113183-01A www.desatech.com... -
Page 6: Air For Combustion
Example: 2560 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 heater Gas water heater* Gas furnace Vented gas heater Gas fireplace logs Gas water heater... -
Page 7: Combustion And Ventilation Air
AIR FOR COMBUSTION AND VENTILATION Continued A. Rework worksheet, adding the space of an adjoin- ing room. If the extra space provides an unconfined space, remove door to adjoining room or add ventilation grills between rooms. See Ventilation Air From Inside Building. B. -
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 pos- sible, provide greater clearances from floor, ceiling, and adjoining wall. LOG SIZING REQUIREMENTS Minimum Firebox Size Height Depth Front Rear * 24" 17" 14" * Measured at 14" depth. Carefully follow the instructions below.
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Page 10: Mantel Clearances
INSTALLATION Continued MANTEL CLEARANCES In addition to meeting noncombustible material clearances, you must also meet required clearances between fireplace opening and mantel shelf. 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 required (see Figure 6). - Page 11 INSTALLATION Continued INSTALLING HEATER BASE ASSEMBLY WARNING: You must secure this heater to fireplace floor. If not, heater will move when you adjust controls. Moving heater may cause a gas leak. WARNING: If installing in a sunken fireplace, special care is needed.
- Page 12 INSTALLATION Continued CONNECTING TO GAS SUPPLY WARNING: This appliance requires a 1/2" NPT (National Pipe Thread) inlet connection to the pressure regulator. WARNING: A qualified ser- vice person must connect heater to gas supply. Follow all local codes. CAUTION: For propane/LP gas, never connect heater di- rectly to the propane/LP supply.
- Page 13 INSTALLATION Continued We recommend that you install a sediment trap in supply line as shown in Figure 13. Locate sediment trap where it is within reach for cleaning. Install in piping system between fuel supply and heater. Locate sediment trap where trapped matter is not likely to freeze.
- Page 14 INSTALLATION Continued Test Pressures Equal To or Less Than 1/2 PSIG (3.5 kPa) 1. Close equipment shutoff valve (see Figure 14). 2. Pressurize supply piping system by either opening propane/LP supply tank valve for propane/LP gas or opening main gas valve located on or near gas meter for natural gas, or using compressed air.
- Page 15 INSTALLATION Continued Left Log #3 Front Log #2 Figure 18 - Installing Middle Log #1, Front Log #2, Left Log #3 and Right Log #4 113183-01A Figure 19 - Installing Rear Log #5 and Crossover Log #6 Right Log #4 ADDING LAVA ROCK Place lava rock around base of heater if desired.
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Page 16: Operating Heater
OPERATING HEATER FOR YOUR SAFETY READ BEFORE LIGHTING WARNING: If you do not fol- low these instructions exactly, a fire or explosion may result causing property damage, per- sonal injury or loss of life. A. This appliance has a pilot which must be lighted by hand. - Page 17 OPERATING HEATER Continued Ignitor Button Control Knob Rear Burner Control Knob Figure 21 - Control Knob(s) and Ignitor Button Locations 113183-01A www.desatech.com...
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Page 18: Inspecting Burners
Pilot Burner www.desatech.com 113183-01A... -
Page 19: Cleaning And Maintenance
CLEANING AND MAINTENANCE WARNING: Turn off heater and let cool before cleaning. CAUTION: You must keep con- trol areas, burners, and circulating air passageways of heater clean. Inspect these areas of heater before each use. Have heater inspected yearly by a qualified service person. -
Page 20: 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 ignitor button is pressed, there is no spark at ODS/pilot... - Page 21 OBSERVED PROBLEM ODS/pilot lights but flame goes out when control knob is released One or more burners do not light after ODS/pilot is lit Delayed ignition of one or more burners Burner backfiring during com- bustion Yellow flame in burner during burner combustion 113183-01A TROUBLESHOOTING...
- Page 22 OBSERVED PROBLEM Slight smoke or odor during initial operation Heater produces a whistling noise when burners are lit White powder residue forming within burner box or on adjacent walls or furniture Moisture/condensation noticed on windows Heater produces a clicking/tick- ing noise just after burners are lit or shut off TROUBLESHOOTING Continued...
- 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: Optional Positioning Of Thermostat Sensing Bulb
OPTIONAL POSITIONING OF THERMOSTAT SENSING BULB FOR MASONRY AND FACTORY- BUILT METAL FIREPLACE If your log set cycles to pilot, but the room tem- perature drops to a lower than ideal comfort level before the log set comes back on, you may want to reposition the thermostat sensing bulb. -
Page 25: Specifications
Contact authorized dealers of this product. If they canʼt supply original replacement part(s), call DESA Heating Products' Technical Service Department at 1-866-672-6040. When calling DESA Heating Products, have ready • your name • your address • model and serial numbers of your heater •... -
Page 26: Illustrated Parts Breakdown And Parts List
ILLUSTRATED PARTS BREAKDOWN MODELS CDR3924PT AND CDR3924NT www.desatech.com 113183-01A... -
Page 27: Parts List
114959-03 114959-04 114959-05 114959-06 100563-01 101054-05 100639-03 GA6060 101449-08 ** Not a field replaceable part. 113183-01A PARTS LIST CDR3924PT DESCRIPTION Dual Ramp Base 113473-01 Rear Burner Tube 113474-01 Front Burner Tube 111124-01 Retainer Spring 113244-01 Front Burner 113167-01 Log Support Bracket... -
Page 28: Warranty Information
This warranty is extended only to the original retail purchaser. This warranty covers the cost of part(s) required to restore this heater to proper operating condition and an allowance for labor when provided by a DESA Heating Products Authorized Service Center. Warranty part(s) MUST be obtained through authorized dealers of this product and/or DESA Heating Products who will provide original factory replacement parts.