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bsi138Manuals and User Guides for Crown Boiler BSI SERIES. We have 5 Crown Boiler BSI SERIES manuals available for free PDF download: Installation, Operating And Service Instructions, Installation Instructions Manual, InstallationCrown Boiler BSI138 user manual. Topics manualsbase, manuals, Collection manuals_contributions; manuals; additional_collections Language English Item Size 23.5M .