GENERALYORK Model D3GH units are cooling/heating air conditionersdesigned for outdoor installation. Only gas piping, electricpower and duct connections are required at the point of instal-lation.The gas-fired heaters have hot surface ignition. The tubularheat exchangers are aluminized steel.This appliance is not to be used for temporary heating ofbuildings or structures under construction.INSPECTIONAs soon as a unit is received, it should be inspected for possibledamage during transit. If damage is evident, the extent of thedamage should be noted on the carrier’s freight bill. A separaterequest for inspection by the carrier’s agent should be made inwriting. Refer to Form 50.15-NM for additional information.RENEWAL PARTS• Refer to Renewal Parts, Form 530.44-RP1Y for Key Re-placement Parts.All forms referenced in this instruction may be ordered from:Publications Distribution CenterUnitary Products GroupP.O. Box 1592, York, Pa. 17405APPROVALSDesign certified by CGA and UL listed as follows:1. For use as a forced air furnace with cooling unit.2. For outdoor installation only.3. For installation directly on combustible flooring or, in the U.S.A.,on wood flooring or Class A, B, or C roof covering material.4. For use with natural gas and/or propane (LP) gas.Not suitable for use with conventional venting systems.STELLAR 2000SINGLE PACKAGE AIR CONDITIONERSGAS/ELECTRIC, AIR-COOLEDSupersedes: 530.44-N5Y (893) 530.44-N5Y (1294)MODELS D3GH018 THRU 036(12 SEER)035-12491INSTALLATION INSTRUCTIONInstaller should pay particular attention to the words:NOTE, CAUTION andWARNING. Notes are intended to clarify or makethe installation easier. Cautions are given to prevent equipment damage. Warnings are given to alert installer that personalinjury and/or equipment damage may result if installation procedure is not handled properly.CAUTIONTHE ENCLOSED INSTALLATION INSTRUCTIONS AND ANY APPLICABLELOCAL, STATE, AND NATIONAL CODES INCLUDING, BUT NOT LIM ITEDTO, BUILDING, ELECTRICAL, AND M ECHANICAL CODES.THIS PRO DUCT M UST BE INSTALLED IN STRICT CO M PLIANCE W ITHWARNINGOPERATION OF THE PRODUCT COULD CAUSE PERSONAL INJURYO R P R O P E R T Y D A M A G E .INCORRECT INSTALLATION M AY CREATE A CONDITION W HERE THE— Do not store or use gasoline or otherflammable vapors and liquids in thevicinity of this or any other appliance.— WHAT TO DO IF YOU SMELL GAS•• Do not try to light any appliance.•• Extinguish any open flames.•• Do not touch any electrical switch; donot use any phone in your building.•• Immediately call your gas supplierfrom a n eig hb or’s pho ne. Fol lowthe gas supplier’s instructions.•• If you cannot reach your gas supplier,call the fire department.— Installation and service must be performedby a qualified installer, service agency orthe gas supplier.WARNING: If the information in this manual isnot followed exactly, a fire or explosion mayresult causing property damage, personalinjury or loss of life.