No duplication or reproduction of this book may be made without the express written authorization of the A.O. Smith Water Products Company. The following text and illustrations will provide you with a step by step procedure to verify proper installation, operation, and troubleshooting procedures. Additional quick reference data is included to assist you in servicing this product. The information contained in this handbook is designed to answer common questions encountered in the operation of the

B. If the reading taken is less than 1.7 million ohms, and the wiring from the control to the sensor is good, replace the lower control. 12. “FV-SENSE” and “SHORT” Flashing Flammable Vapor Sensor is shorted 1. Check all wiring to the flammable vapor sensor. 2. Remove the connectors from the flammable vapor sensor and measure the resistance of the sensor with an ohmmeter. A. If the reading taken is less than 2000 ohms, replace the flammable vapor sensor. B. If the reading taken is more than 2000

On the bottom of the control is where electrical connections to the other component parts are attached along with the gas supply (manifold tube) to the main burner. The gas control/valve thermostat of this water heater is suitable for use on Natural gas only. Manifold Tube Control Display, Anode Rod Connector Pressure Switch / Fan, FV Sensor Connector Power Supply Transformer Connector Igniter/Flame Sense Connector Gas Control Valve/ Thermostat Temperature Probe /High Limit Probe Gas Supply- Inl

Repair or replace any parts that are worn, damaged, or failing to make a good connection. AOS WPC - Tech Training 42 of 72 Ashland City, TN © 2007 Servicing should only be performed by a Qualified Service Agent VF BOILER SERVICE MANUAL ERROR MESSAGES (CONT) DISPLAYED MESSAGE CONDITION/INDICATES CHECK/REPAIR “Display Fail” • Plug UIM comm cable into the other “internal” comm port on the MCB. (see page 32) Communication between the MCB and UIM has • Check comm cable to the UIM. Turn off power been

TC-044R6 • Printed in the U.S.A. • 1105 m A.O. Smith Water Heaters BTH Service Handbook TABLE OF CONTENTS Introduction...................2 Installation Clearances.....................3 Gas Requirements...............3 Venting.....................4 - 8 Air Requirements............9-11 Contaminated Air...............12 Flammable Items...............12 Multiple Unit Piping..............13 Condensation..................14 Operation Sequence of Operation..........15 Controls........

• Safety Instructions • Installation • Operation PRINTED IN THE U.S.A 0410 PART NO. 315456-002 ALL TECHNICAL AND WARRANTY QUESTIONS: SHOULD BE DIRECTED TO THE LOCAL DEALER FROM WHOM THE WATER HEATER WAS PURCHASED. IF YOU ARE UNSUCCESSFUL, CONTACT RESIDENTIAL TECHNICAL ASSISTANCE AT 1-800-527-1953 OR WWW.HOTWATER.COM. — Do not store or use gasoline or other flammable vapors and liquids in the vicinity of this or any other appliance. — WHAT TO DO IF YOU SMELL GAS • Do not try to light any applianc

SMITH CORPORATION XTRA HIGH EFFICIENCY XTRA HIGH EFFICIENCY Installation User and Service Manual 28 30 50 60 Release R.1.3 UK your installer Warning Read this manual carefully before first using the water heater. Failure to read this manual and to follow the instructions in this manual may lead to accidents, personal injury, and damage to the appliance. Copyright Copyright 2003 A.O. Smith Water Products Company All rights reserved. Nothing from this publication may be copied, reproduced and/or p