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View and Download Lennox SL280UHV installation instructions manual online. SL280UHV Series DAVE LENNOX SIGNATURE COLLECTION GAS FURNACE UPFLOW / HORIZONTAL We have 3 Lennox SL280UHV manuals available for free PDF download: Installation Instructions Manual, User Instruction Manual, User's Information Manual. Lennox Installation and service must be performed by a licensed professional HVAC installer or equivalent, service agency, or the gas supplier. THIS MANUAL MUST BE equivalent), service agency or the gas supplier. INSTALLATION INSTRUCTIONS SL280UHV. DAVE LENNOX SIGNATURE. ®. COLLECTION GAS FURNACE UPFLOW / HORIZONTAL AIR DAVE LENNOX SIGNATURE®. COLLECTION GAS FURNACE. DOWNFLOW AIR DISCHARGE. 506710-01. 01/2015. Supersedes 10/2014. THIS MANUAL MUST BE LEFT WITH THE. HOMEOWNER NOTE − Each furnace model uses a unique CAI. Refer to Lennox Repair Parts listing for correct inducer for re- placement. A proving switch connected to the Check for proper configuring under: Unit Size Codes for. Furnace/Air Handler on configuration guide or in installation instructions. Cleared after the correct. NOTE - This manual is the property of the homeowner and must be left with the equipment user. Notice to Homeowner. This furnace is equipped with safety E 2010 Lennox Industries Inc. NOTE − This manual is the property of the homeowner This furnace is equipped with safety devices that protect.