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A. O. SMITH WATER PRODUCTS COMPANY
VF BOILER SERVICE MANUAL
Technical Training Department ©2007
CONTENTS
Introduction.......................................................................
Qualifications....................................................................
Service Warning................................................................
Tools Required..................................................................
EMC 5000 Modulation Control System...........................
UIM - User Interface Module - Overview..........................
UIM - Status Lights............................................................
UIM - Input Buttons...........................................................
UIM - Changing Settings..................................................
UIM - Menu Screens..........................................................
Principles of Operation....................................................
VFD and Blower Operation..............................................
Venturi Operation - Gas Train..........................................
Blower Speed Verification - Hall Effect Sensor..............
Config Key - Blower Speed Programming......................
Sequence Of Operation....................................................
START UP PROCEDURE
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Adjusting Manifold Gas....................................................
Poor Combustion - Ignition Problems............................
Manifold Gas Pressure Check.........................................
Control Panel Layout........................................................
MCB - Modulation Control Board....................................
PDB - Power Distribution Board......................................
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Troubleshooting - Error Messages..................................
Display Is Blank................................................................
Error Message “Display Fail”..........................................
Error Message “No Config Key”......................................
Error Message “Config Key CRC”...................................
Error Message “Config Key Part”....................................
Error Message “Low AC Voltage”....................................
Error Message “Low 24 VAC”..........................................
Error Message “Low Water”............................................
Error Message “Low Gas”...............................................
Error Message “No Flow”................................................
Error Message “Sequence Err”.......................................
Error Message “Ignition Speed”......................................
Error Message “Mtr Spd < Min Spd”................................
Error Message “Blower Prov Stg1”.................................
Error Message “Blocked Flue”........................................
Error Message “Flame Stg1.............................................
Error Message “Igniter Stg1.............................................
Boiler Controls Information.............................................
Operating Temperatures..................................................
Bypass Lines.....................................................................
Technical Specifications..................................................
Glossary............................................................................
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