Water analysis shows whether water is hard or soft. Hard water, unless treated, will cause scaling or liming of the heat exchanger. The rate of scaling increases with temperature and usage because calcium carbonate and other scaling compounds lose solubility (fall out of solution) at higher temperatures. For example, for every 20°F over 140°F, the rate of scale increases by a factor of 2 (See figure below). Reference target water quality levels found in the operation / installation manual and co

The flue pipe should rise for at least 50 cm. vertically before the inclusion of any bends. If a horizontal run of flue is required this should be kept to the minimum lenght possible and incorporate a rise of 6 cm. per metre of run. A split clip or flange should be provided in the flue close to the draught diverter for ease of servicing. All flue materials should be corrosion resident i.e. stainless steel or galvanised and must include a tested and apprved terminal to BS 5440 part 1. If the flue

- 5:00 p.m. EST (423) 283-8062 or (423) 283-8176 Fax: (423) 283-8137 Literature Fulfillment/Promotional Items Hours of Operation: Monday-Friday 8:00 a.m. - 5:00 p.m. EST (423) 232-2477 Fax: (423) 232-2480 Credit/Collections Hours of Operation: Monday-Friday 8:00 a.m. - 5:00 p.m. EST (423) 434-1681 Fax: (423) 975-2457 Visit our Website at Copyright© by American Water Heater Company 2006. All rights reserved. REXP 0206

Consult the instruction manual before changing temperatures. WARNING: TURN OFF ALL ELECTRIC POWER BEFORE SERVICING 13 Valves for reducing point of use temperature by mixing cold and hot water are available. Also available are inexpensive devices that attach to faucets to limit hot water temperatures. Contact a licensed plumber or PURGING Gas line purging is required with new piping or systems in which air has the local plumbing authority. entered. CAUTION PURGING SHOULD BE PERFORMED BY PERSONS E

Copyright © 2007 A.O. Smith Water Products Company All rights reserved. Nothing from this publication may be copied, reproduced and/or published by means of printing, photocopying or by whatsoever means, without the prior written approval of A.O. Smith Water Products Company. A.O. Smith Water Products Company reserves the right to modify specifications stated in this manual. Trademarks Any brand names mentioned in this manual are registered trademarks of their respective owners. Liability A.O. S

Must not be in contact with any electrical part. . Must be connected to an adequate discharge line. . Must not be rated higher than the working pressure shown on the data plate of the water heater. . The BTUH rating of the T & P valve must be greater than, or equal to, the input rating of the water heater. The Discharge Line: . Must not be smaller than the pipe size of the relief valve or have any reducing coupling installed in the discharge line. . Must not be capped, blocked, plugged or contai

All rights reserved. ' amencan WATER HEATER COMPANY am er и can WATER HEATER COMPANY Order Entry and Sales 500 Princeton Road (FedEx, UPS) Johnson City, TN 37601-2030 P.O. Box 4056 (Mailing) Johnson City, TN 37602-4056 Hours of Operation: Monday-Friday 8:00 a.m. - 6:30 p.m. EST (800) 937-1037 Fax: (800) 581-7224 Warranty and Service Support 500 Princeton Road (FedEx, UPS) Johnson City, TN 37601-2030 P.O. Box 1597 (Mailing) Johnson City, TN 37605 Residential Product Service and Supp

Press ON/OFF twice. 03 Error Codes • Ensure approved venting materials are being used. • Check that nothing is blocking the flue inlet or exhaust. • Check all vent components for proper connections. • Ensure vent length is within limits. • Ensure condensation collar was installed correctly. • Verify dip switches are set properly. • Check fan for blockage. Air Supply or Exhaust Blockage • Check that the gas is turned on at the water heater and gas meter. Check for obstructions in the flue outlet.