Design Dynamics VTD-18N-JHB Gas Heater user guide

11. To help prevent breakage, new logs must be broken-in (see Curing Logs, page 10).

12. Do not use heater if any part has been exposed to or under water. Immediately call a qualified service technician to inspect the room heater and to replace any part of the control system and any gas control which has been under water.

13. Turn log set off and let cool before servicing, installing or repairing. Only a qualified service person should install, service or repair log set.

14. Provide adequate clearances around air

Local Codes

Install and use log set with care. Follow all local codes. In the absence of local codes, use the latest edition of the National Fuel Gas Code

ANSI Z223.1/NFPA 54*

*Available from:

American National Standards Institute, Inc.

1430 Broadway

New York, NY 10018

National Fire Protection Association, Inc.

Battery March Park

Quincy, MA 02269

CAUTION: Do not remove the data plates from the grate assembly. The data plates contain important warranty and safety information.

1. Remove logs, hearth kit, pan materials and hardware from carton.

2. Remove all protective packaging applied to logs and base for shipment.

3. Check all items for any shipping damage.

If damaged call DESA Heating, LLC at

1-866-672-6040 for replacement parts before returning to dealer.


Product Identification

WARNING: Failure to position the parts in accordance with these diagrams or failure to use only parts specifically approved with this appliance may result in property damage or personal injury.

Figure 1 - Product Identification (Ramp

Pan Burner)


WARNING: Before installing in a solid fuel burning fireplace, the chimney flue and firebox must be cleaned of soot, creosote, ashes and loose paint by a qualified chimney cleaner. Creosote will ignite if highly heated. A dirty chimney flue may create and distribute soot within the house.

Inspect chimney flue for damage.

If damaged, repair flue damper before operating appliance.

NOTICE: Installation, service and repair of this appliance must be performed by a qualified installer, service agency, company or gas supplier experienced with this type of gas appliance. Only factory authorized components listed in these instructions may be used in accordance with the manufacturer's instructions and all codes and requirements of the authority having jurisdiction.

Any modifications to or use of unauthorized components or accessory items will void the manufacturers warranty and may result in a hazardous condition.



Use only natural gas. If your gas supply is not natural gas, DO NOT install this gas log set.

If the fireplace does not have a gas supply shutoff valve, one must be installed.

WARNING: This appliance is equipped for natural gas. Field conversion is not permitted.


Note: This vented appliance must be installed only in a solid-fuel burning fireplace constructed of noncombustible material.

The charts in Figure 2, page 6 indicate technical information regarding the installation of your gas log set. Please make sure that all of the specifications shown are applicable before installation is attempted.

The fireplace must include a flue and venting system with the minimum openings shown in

Figure 2, page 6.



Minimum Vent










*At depth indicated



Figure 2 - Technical Information Charts



The fireplace chimney flue and vent must be drafting properly. To check the vent for proper drafting: Light a tightly rolled newspaper on one end and place it at the inside front edge of the fireplace. Observe the smoke and be sure the vent is properly drawing it up the chimney. If the smoke spills out into the room, extinguish the flame and remove any obstruction until proper venting is achieved.

The chimney flue must remain open a minimum of 3" at all times during the operation of this log set.

Installing Damper Clamp

Secure the damper stop clamp to the edge of the damper as shown in Figure 3. If for any reason this clamp doesn't work on your fireplace, another suitable clamp or permanent stop must be installed, or the damper blade must be cut or removed