www.desatech.com 111604-01H2WARNING: Improper installation, adjustment, altera-tion, service, or maintenance can cause injury or prop-erty damage. Refer to this manual for correct installationand operational procedures. For assistance or addi-tional information consult a qualified installer, serviceagency, or the gas supplier.WARNING: This is an unvented gas-fired heater. It usesair (oxygen) from the room in which it is installed. Provi-sions for adequate combustion and ventilation air mustbe provided. Refer to Air for Combustion and Ventilationsection on page 5 of this manual.This appliance may be installed in an aftermarket,* per-manently located, manufactured (mobile) home, wherenot prohibited by local codes.This appliance is only for use with the type of gas indi-cated on the rating plate. This appliance is not convert-ible for use with other gases.* Afterm arket: Completion of sale, not for purpose of resale, from the manufacturerTABLE OF CONTENTSSafety Information ............................................... 3Product identification ........................................... 4Local Codes ........................................................ 5Unpacking ........................................................... 5Product Features ................................................. 5Air for Combustion and Ventilation ...................... 5Installation ........................................................... 8Operating Heater ............................................... 19Inspecting Burners ............................................ 22Cleaning and Maintenance ................................ 23Troubleshooting ................................................. 25Specifications .................................................... 29Wiring Diagram .................................................. 29Technical Service .............................................. 29Service Hints ..................................................... 29Replacement Parts ............................................ 29Illustrated Parts Breakdown and Parts List ....... 30Accessories ....................................................... 34Warranty Information ...........................Back Cover