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Desa CDR3924NT Owner's Operation And Installation Manual

Unvented (vent-free) gas log heater
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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.
INSTALLER: Leave this manual with the appliance.
CONSUMER: Retain this manual for future reference.
For more information, visit www.desatech.com

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Summary of Contents for Desa CDR3924NT

  • 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.

  • Page 2: Table Of Contents

    TAbLE OF CONTENTS Safety Information .......... Cleaning and Maintenance ........ 19 Local Codes............4 Troubleshooting ..........0 Product Identification ........... 5 Optional Positioning of Thermostat Sensing Bulb..4 Unpacking............5 Specifications ............ 5 Product Features ..........5 Replacement Parts ..........5 Air For Combustion and Ventilation .....

  • Page 3: Safety Information

    SAFETy INFORMATION WARNING: This appliance Continued is for installation only in a solid-fuel burning fireplace or WARNING: This product approved ventless firebox en- contains and/or generates closure. chemicals known to the State of California to cause cancer or WARNING: Do not allow fans birth defects or other reproduc- to blow directly into the fireplace.

  • Page 4: Local Codes

    11. Do not run heater SAFETy INFORMATION • where flammable liquids or vapors are used Continued or stored 1. This appliance is only for use with the type of • under dusty conditions gas indicated on the rating plate. This appliance 12.

  • Page 5: Product Identification

    PRODUCT SAFETY DEvICE This heater has a pilot with an Oxygen Deple- IDENTIFICATION tion Sensing (ODS) safety shutoff system. The ODS/pilot is a required feature for vent-free room Log Set heaters. The ODS/pilot shuts off the heater if there is not enough fresh air. IGNITION SYSTEM This heater has an electronic ignitor to light heater fuel supply.
  • Page 6 AIR FOR COMbUSTION DETERMINING FRESH-AIR FLOW FOR HEATER LOCATION AND VENTILATION Continued Determining if You Have a Confined or Unconfined Space Unusually Tight Construction Use this work sheet to determine if you have a The air that leaks around doors and windows confined or unconfined space.

  • Page 7: Combustion And Ventilation Air

    AIR FOR COMbUSTION AND VENTILATION 12" Continued Ventilation Ventilation Grills A. Rework worksheet, adding the space of an adjoin- Grills Into Into Adjoining Room, Adjoining ing room. If the extra space provides an unconfined Option 2 Room, Remove space, remove door to adjoining room or add Option 1 Door into ventilation grills between rooms.

  • Page 8: Installation

    INSTALLATION WARNING: Seal any fresh NOTICE: This heater is intended air vents or ash clean-out doors for use as supplemental heat. located on floor or wall of fire- Use this heater along with your place. If not, drafting may cause primary heating system.

  • Page 9: Installation And Clearances

    INSTALLATION Minimum Noncombustible Material Clearances Continued If Not Using Mantel Note: If using a mantel proceed to If Using Mantel. INSTALLATION AND CLEARANCES If not using a mantel, follow the information on FOR VENT-FREE OPERATION this page. You must have noncombustible material(s) above the WARNING: Maintain the fireplace opening.

  • Page 10: Mantel Clearances

    INSTALLATION Mantel Shelf 10" Underside of Continued 8" Mantel Shelf 6" MANTEL CLEARANCES 1 /2 " In addition to meeting noncombustible material clearances, you must also meet required clearances All minimum distances are between fireplace opening and mantel shelf. If in inches Minimum Non- you do not meet the clearances listed below, you...
  • Page 11 2. Locate two masonry screws in hardware INSTALLATION package. Continued 3. Place heater base in fireplace. INSTALLING HEATER BASE 4. Place logs in their proper position on heater ASSEMBLY base (see Installing Logs, page 14). 5. Center heater base and logs front-to-back and WARNING: You must secure side-to-side in fireplace.
  • Page 12 INSTALLATION WARNING: For natural Continued gas, never connect heater to CONNECTING TO GAS SUPPLY private (non-utility) gas wells. This gas is commonly known WARNING: This appliance as wellhead gas. requires a 1/2" NPT (National Pipe Thread) inlet connection to CAUTION: Use only new, the pressure regulator.
  • Page 13 INSTALLATION CHECKING GAS CONNECTIONS Continued WARNING: Test all gas pip- We recommend that you install a sediment trap in ing and connections, internal supply line as shown in Figure 13. Locate sediment and external to unit, for leaks trap where it is within reach for cleaning. Install after installing or servicing.
  • Page 14 6. Light heater (see Operating Heater, page 16). INSTALLATION Check all other internal joints for leaks. Continued 7. Turn off heater (see To Turn Off Gas to Appli- Test Pressures Equal To or Less Than ance, page 17). 1/2 PSIG (3.5 kPa) 1.
  • Page 15 INSTALLATION Crossover Continued Log #6 1. Place middle log (#1) onto log alignment screw located near the center of base and in Rear place over log support bracket as shown in Log #5 Figures 17 and 18. 2. Place front log (#2) onto base. Position log onto two alignment screws to the front of base (see Figure 18).

  • Page 16: Operating Heater

    OPERATING HEATER LIGHTING INSTRUCTIONS FOR YOUR SAFETY READ BEFORE LIGHTING WARNING: • If fireplace has glass doors, WARNING: If you do not fol- never operate this heater with low these instructions exactly, glass doors closed. If you oper- a fire or explosion may result ate heater with doors closed, causing property damage, per- heat buildup inside fireplace...

  • Page 17: Thermostat Control

    OPERATING HEATER CAUTION: Do not try to ad- Continued just heating levels by using the 5. Turn control knob counterclockwise equipment shutoff valve. to the PILOT position. Press in control knob for five (5) seconds (see Figure 21). Ignitor Note: You may be running this heater for Thermocouple Electrode the first time after hooking up to gas sup-...

  • Page 18: Inspecting Burners

    If so, contact DESA Heating Products’ Technical Service Department at 1-866-672-6040. When calling, please have your model and serial numbers of your heater ready. You can also visit DESA Heating Products’ techni- cal services web site at www.desatech.com. www.desatech.com 113183-01F...

  • Page 19: Cleaning And Maintenance

    particles of dust, dirt, lint or pet hair with a CLEANING AND soft cloth or vacuum cleaner nozzle. MAINTENANCE 5. Blow air into the primary air holes on the injector holders. WARNING: Turn off heater 6. In case any large clumps of dust have now been and let cool before cleaning.

  • Page 20: 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 21 TROUbLESHOOTING Continued OBSERVED PROBLEM POSSIBLE CAUSE REMEDY ODS/pilot lights but flame 1. Control knob not fully pressed in 1. Press in control knob fully goes out when control knob is 2. Control knob not pressed in 2. After ODS/pilot lights, keep released long enough control knob pressed in 30...
  • Page 22 TROUbLESHOOTING Continued OBSERVED PROBLEM POSSIBLE CAUSE REMEDY Slight smoke or odor during initial 1. Residues from manufacturing 1. Problem will stop after a few operation processes and logs curing hours of operation Heater produces a whistling noise 1. Turning control knob to HI 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.

  • Page 24: Optional Positioning Of Thermostat Sensing Bulb

    OPTIONAL POSITIONING OF THERMOSTAT SENSING bULb FOR MASONRY AND FACTORY- BUILT METAL FIREPLACE Figure 32 - Adhesive-backed Mounting Clip If your log set cycles to pilot, but the room tem- perature drops to a lower than ideal comfort level Thermostat before the log set comes back on, you may want Sensing Bulb to reposition the thermostat sensing bulb.

  • Page 25: Specifications

    1/8" NPT tap. Fits 1/2" NPT pipe. 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

    ILLUSTRATED PARTS bREAkDOWN MODELS CDR3924PT AND CDR3924NT www.desatech.com 113183-01F...

  • Page 27: Parts List

    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 CDR3924NT CDR3924PT DESCRIPTION QTY. Dual Ramp Base 111331-16 11343-01 Rear Burner Tube...

  • 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.

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Cdr3924pt

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