Propane Gas Models40-60-80,000 Btu/HrNatural Gas Models50-70-100,000 Btu/HrIMPORTANT: Read and understand this manual before assembling, starting or servicingheater. Improper use of heater can cause serious injury. Keep this manual for future reference.PROPANE AND NATURALGAS CONSTRUCTION HEAVYDUTY RADIANT HEATERSOWNER’S MANUALSave this manual for future reference.Save this manual for future reference.For more information, visit www.desatech.comFor more information, visit www.desatech.comGENERAL HAZARD WARNING:FAILURE TO COMPLY WITH THE PRECAUTIONS AND INSTRUCTIONS PROVIDED WITH THISHEATER, CAN RESULT IN DEATH, SERIOUS BODILY INJURY AND PROPERTY LOSS ORDAMAGE FROM HAZARDS OF FIRE, EXPLOSION, BURN, ASPHYXIATION, CARBON MONOX-IDE POISONING, AND/OR ELECTRICAL SHOCK.ONLY PERSONS WHO CAN UNDERSTAND AND FOLLOW THE INSTRUCTIONS SHOULD USEOR SERVICE THIS HEATER.IF YOU NEED ASSISTANCE OR HEATER INFORMATION SUCH AS AN INSTRUCTIONSMANUAL, LABELS, ETC. CONTACT THE MANUFACTURER.TABLE OF CONTENTSSAFETY INFORMATION ............................................................ 2UNPACKING ............................................................................... 3PRODUCT IDENTIFICATION ..................................................... 3THEORY OF OPERATION ......................................................... 3PROPANE SUPPLY .................................................................... 3NATURAL GAS SUPPLY ............................................................ 4VENTILATION ............................................................................. 4INSTALLATION ........................................................................... 4OPERATION ............................................................................... 5STORAGE ................................................................................... 6MAINTENANCE .......................................................................... 6SPECIFICATIONS ...................................................................... 6TROUBLESHOOTING ................................................................ 7ILLUSTRATED PARTS BREAKDOWN AND PARTS LIST ......... 8REPLACEMENT PARTS .......................................................... 10ACCESSORY ............................................................................ 10TECHNICAL SERVICE ............................................................. 10OWNER’S REGISTRATION PAGE ............................................ 11WARRANTY AND REPAIR SERVICE ........................ Back Cover