9Figure 1.6 - 10kW, GT-530 (Inlet Hose Slid Back)Fuel SelectionLever - "Out"Position forLiquid Propane(Vapor) Fuel3. Close the roof.4. Reverse the procedure to convert back to natural gas.Figure 1.7 - 14, 17, & 20kW,GT-990/GT-999 (Airbox Cover Removed)Fuel Selection Lever - "In" Position for Natural Gas FuelFigure 1.8 - 14, 17, & 20kW,GT-990/GT-999 (Airbox Cover Removed)Fuel Selection Lever - "Out" Position for Liquid Propane(Vapor) Fuel1.11 HIGH ALTITUDE OPERATIONThe fuel system on this generator may be influenced by operationat higher altitudes. Proper operation can be ensured by installingan altitude kit when required. See the table below to determinewhen an altitude kit is required. Operating this generator withoutthe proper altitude kit installed may increase the engine’s emis-sions and decrease fuel economy and performance. Kits may beobtained from any Dealer, and should be installed by a qualifiedindividual.1.12 LOCATIONThe engine exhaust fumes contain carbonmonoxide, which can be DEADLY. This dan-gerous gas, if breathed in sufficient con-centrations, can cause unconsciousness oreven death. This generator must be installedproperly, in strict compliance with applicablecodes and standards. Following installation,do nothing that might render the systemunsafe or in noncompliance with such codesand standards.Operate the generator outdoors ONLY.• Keep exhaust gases from entering a confinedarea through windows, doors, ventilation, crawlspaces or other openings (Figure 1.9).• It is highly recommended that carbon monox-ide detector(s) be installed indoors accordingto the manufacturer's instructions/recommen-dations.• The generator must be mounted safely perapplicable codes and the manufacturer's speci-fications. DO NOT alter or add to the exhaustsystem, or do anything that might render theexhaust system unsafe or in noncompliancewith applicable codes and standards.General Information