ProPane ConstruCtion ForCed air HeateroWner’s ManuaLVariaBLe 30-55,000, 50-85,000 and 75-125,000 Btu/HrIMPORTANT: Read and understand this manual beforeassembling, starting or servicing heater. Improper useof heater can cause serious injury. Keep this manual forfuture reference.GENERAL HAZARD WARNING:Failure to comply with the precautions and instructionsprovided with this heater, can result in death, seriousbodily injury and property loss or damage from hazardsof fire, explosion, burn, asphyxiation, carbon monoxidepoisoning and/or electrical shock.Only persons who can understand and follow the in-structions should use or service this heater.If you need assistance or heater information such as an in-structions manual, labels, etc. Contact the manufacturer.save this manual for future reference.For more information, visit www.desatech.comtaBLe oF ContentsSafety .................................................................. 2Product Identification ........................................... 3Unpacking............................................................ 3Theory of Operation............................................. 4Propane Supply ................................................... 4Installation ........................................................... 5Ventilation ............................................................ 5Operation ............................................................. 6Storage ................................................................ 6Maintenance ........................................................ 7Troubleshooting ................................................... 7Service Procedures ............................................. 8Specifications .................................................... 10Wiring Diagram .................................................. 10Replacement Parts .............................................11Technical Service................................................11Parts .................................................................. 12Warranty ............................................................ 18