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Download 659 Lochinvar Boiler PDF manuals. User manuals, Lochinvar Boiler Operating guides and Service manuals.. Manual along with the FTXL Service Manual are for use only by a qualified heating installer/service technician. Refer only to this User's Information Manual for your reference. Improper installation, adjustment, alteration, service or maintenance can cause property damage, personal injury (exposure to hazardous materials) or loss of life.