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. Download. Like. Full screen Standard. Page of 54 Go. 17. X Wiring. 1) 120 Volt Wiring - The boiler should be provided with its own 15A branch circuit with