www.desatech.com113680-01A 3SAFETY INFORMATIONIMPORTANT: Read this owner’smanual carefully and completelybefore trying to assemble, oper-ate, or service this heater. Im-proper use of this heater cancause serious injury or deathfrom burns, fire, explosion, elec-trical shock, and carbon mon-oxide poisoning.DANGER: Carbon monoxidepoisoning may lead to death!Carbon Monoxide Poisoning: Early signs of car-bon monoxide poisoning resemble the flu, withheadaches, dizziness, or nausea. If you have thesesigns, the heater may not be working properly. Getfresh air at once! Have heater serviced. Somepeople are more affected by carbon monoxide thanothers. These include pregnant women, people withheart or lung disease or anemia, those under theinfluence of alcohol, and those at high altitudes.Natural and Propane/LP Gas: Natural and pro-pane/LP gases are fuel gases. Fuel gases are odor-less. An odor-making agent are added to fuel gases.The odor helps you detect a fuel gas leak. How-ever, the odor added to fuel gas can fade. Fuel gasmay be present even though no odor exists.Make certain you read and understand all warn-ings. Keep this manual for reference. It is yourguide to safe and proper operation of this heater.WARNING: Any change tothis heater or its controls can bedangerous.WARNING: Do not use ablower insert, heat exchangerinsert or other accessory notapproved for use with this heater.Due to high temperatures, theappliance should be located outof traffic and away from furni-ture and draperies.Do not place clothing or otherflammable material on or nearthe appliance. Never place anyobjects on the heater.Surface of heater becomes veryhot when running heater. Keepchildren and adults away fromhot surface to avoid burns orclothing ignition. Heater will re-main hot for a time after shut-down. Allow surface to cool be-fore touching.Carefully supervise young chil-dren when they are in the sameroom with heater.Make sure grill guard is in placebefore running heater.Keep the appliance area clearand free from combustible ma-terials, gasoline and other flam-mable vapors and liquids.1. This appliance is only for use with the type ofgas indicated on the rating plate. This appli-ance is not convertible for use with other gases.2. Do not place propane/LP supply tank(s) in-side any structure. Locate propane/LP supplytank(s) outdoors.3. This heater shall not be installed in a bath-room. 20,000 and 30,000 Btu/Hr heater mod-els shall not be installed in a bedroom.4. If you smell gas• shut off gas supply• do not try to light any appliance• do not touch any electrical switch; do notuse any phone in your building• immediately call your gas supplier from aneighbor’s phone. Follow the gas supplier’sinstructions• if you cannot reach your gas supplier, callthe fire department5. This heater needs fresh, outside air ventila-tion to run properly. This heater has an Oxy-gen Depletion Sensing (ODS) safety shutoffsystem. The ODS shuts down the heater if notenough fresh air is available. See Air for Com-bustion and Ventilation, page 5.