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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
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

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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 followed 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 ..............2 Troubleshooting ..........20 Local Codes............4 Optional Positioning of Thermostat Sensing Bulb ... 24 Product Identification ........... 5 Specifications ............ 25 Unpacking............5 Replacement Parts ..........25 Product Features ..........5 Service Hints ............. 25 Air For Combustion and Ventilation .....
  • Page 3 SAFETy Continued IMPORTANT: Read this owner’s WARNING: Do not allow fans manual carefully and completely to blow directly into the fireplace. before trying to assemble, oper- Avoid any drafts that alter burner ate or service this heater. Improp- flame patterns. Ceiling fans can er use of this heater can cause create drafts that alter burner property damage and serious...

  • Page 4: Local Codes

    SAFETy Continued 2. Do not place propane/LP supply tank(s) cleaner or similar products, turn heater off. If inside any structure. Locate propane/LP heated, the vapors from these products may supply tank(s) outdoors. create a white powder residue within burner 3. If you smell gas box or on adjacent walls and furniture.

  • Page 5: Product Identification

    ODS/pilot is a required feature for vent-free 3. Check heater for any shipping damage. If room heaters. The ODS/pilot shuts off the heater is damaged call DESA Heating, LLC heater if there is not enough fresh air. at 1-866-672-6040 for replacement parts IGNITION SYSTEM before returning to dealer.
  • Page 6 AIR FOR COMbUSTION AND VENTILATION Continued to operate. You must provide adequate fresh whose volume is not less than 50 cubic feet per air for these appliances. This will insure proper 1,000 Btu/Hr (4.8 m per kw) of the aggregate venting of vented fuel-burning appliances.
  • Page 7 AIR FOR COMbUSTION AND VENTILATION Continued Example: one within 12" of the floor on the wall connecting 40,000 the two spaces (see options 1 and 2, Figure 2). Gas water heater __________Btu/Hr You can also remove door into adjoining room 39,000 Vent-free heater + _________Btu/Hr...

  • Page 8: Installation

    INSTALLATION NOTICE: This heater is intended WARNING: Seal any fresh for use as supplemental heat. air vents or ash clean-out doors Use this heater along with your located on floor or wall of fire- primary heating system. Do not place. If not, drafting may cause install this heater as your pri- pilot outage or sooting.
  • Page 9 INSTALLATION Continued bustible material must be 4" from the side WARNING: This appliance is of the fireplace cabinet (see Figure 4). equipped for either natural gas Note: When installing your gas logs into or propane/LP gas but not both. a manufactured firebox, follow firebox manufacturer’s instructions for minimum Gas type is indicated on the rat- clearances to combustible materials.
  • Page 10 INSTALLATION Continued at least 8" up. If noncombustible material is material is more than 12", you may need the less than 12", you must install the fireplace hood accessory to deflect heat away from hood accessory. See Figure 5 for minimum your mantel shelf.
  • Page 11 INSTALLATION Continued FLOOR CLEARANCES CAUTION: Do not pick up A. If installing appliance on the floor level, heater base assembly by burn- you must maintain the minimum distance ers. This could damage heater. of 14" to combustibles (see Figure 8). Only handle base assembly by B.
  • Page 12 INSTALLATION Continued 8. Remove heater base from fireplace. If • piping (check local codes) installing optional control accessories, • sealant (resistant to propane/LP gas) do so at this time. Follow all directions • equipment shutoff valve * provided with accessory. •...
  • Page 13 INSTALLATION Continued Installation must include an equipment shutoff CAUTION: Avoid damage to valve, union and plugged 1/8" NPT tap. Locate regulator. Hold gas regulator NPT tap within reach for test gauge hook up. NPT tap must be upstream from heater (see with wrench when connecting it Figure 13).
  • Page 14 INSTALLATION Continued 5. Correct all leaks at once. shutoff valve (see Figure 15 or 16). Apply 6. Reconnect heater and equipment shutoff a noncorrosive leak detection fluid to all valve to gas supply. Check reconnected joints. Bubbles forming show a leak. fittings for leaks.
  • Page 15 INSTALLATION Continued 1. Place middle log (#1) onto log alignment 6. Place crossover log (#6) onto log align- screw located near the center of base ment pin on middle log (#1) and rear log and in place over log support bracket as (#5) (see Figure 19).

  • Page 16: Operation

    OPERATION FOR YOUR SAFETY READ LIGHTING BEFORE LIGHTING INSTRUCTIONS WARNING: WARNING: If you do not fol- • If fireplace has glass doors, low these instructions exactly, never operate this heater with a fire or explosion may result glass doors closed. If you op- causing property damage, per- erate heater with doors closed, sonal injury or loss of life.

  • Page 17: Thermostat Control

    OPERATION Continued Ignitor Button Control Knob Rear Burner 5. Turn control knob counterclockwise Control Knob to the PILOT position. Press in control knob for five (5) seconds (see Figure 21). Note: You may be running this heater for the first time after hooking up to gas sup- ply.

  • Page 18: Inspecting Burners

    INSPECTING bURNERS Check pilot flame pattern and burner flame terns. Figure 27 shows incorrect burner flame patterns often. patterns. The incorrect burner flame patterns show yellow tipping at top of blue flame. pILOT FLAME pATTERN Figure 24 shows a correct pilot flame pattern. WARNING: If yellow tipping Figure 25 shows an incorrect pilot flame pat- occurs, your heater could pro-...
  • Page 19 CLEANING AND MAINTENANCE Continued ral pilot is behind the pilot bracket on the top WARNING: Failure to keep of burner carriage (see Figure 30). You may the primary air opening(s) of blow through a drinking straw if compressed air is not available. the burner(s) clean may result in Injector Holder sooting and property damage.

  • 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 1. Press in control knob fully goes out when control knob pressed in is released 2. Control knob not pressed 2. After ODS/pilot lights, keep in long enough control knob pressed in 30 seconds...
  • Page 22 TROUbLESHOOTING Continued OBSERvED pROBLEM pOSSIBLE CAUSE REMEDY Yellow flame in burner during 1. Not enough air 1. Check burner(s) for dirt burner combustion and debris. If found, clean burner(s) (see Cleaning and Maintenance, page 18) 2. Gas regulator defective 2. Replace gas regulator Slight smoke or odor during 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

    • propane/LP gas supply may be low serial numbers of your heater ready. You may feel your gas pressure is too low. If You can also visit DESA Heating, LLC’s web so, contact your local natural or propane/LP site at www.desatech.com.

  • Page 26: Parts

    PARTS MODELS CDR3924PT AND CDR3924NT www.desatech.com 122270-01D...
  • 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. NO. PART NO. DESCRIpTION QTY. Dual Ramp Base • • 111331-16 Rear Burner Tube •...

  • Page 28: Warranty

    This is DESA Heating, LLC’s exclusive warranty, and to the full extent allowed by law; this express warranty excludes any and all other warranties, express or implied, written or verbal and limits the duration of any and all implied warranties, including warranties of merchantability and fitness for a particular purpose to one (1) year on new products and 30 days on factory reconditioned products from the date of first purchase.

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