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manual abstract
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 BTR product line and is not meant to be all inclusive. If you are experiencing a problem not covered in this handbook, please contact the A.O. Smith Technical Information Department at 1-800-5271953 or your local A.O. Smith Water Products Company representative for further assistance. This handbook is intended for use by licensed plumbing professionals and reference should be made to the installation manual accompanying the product. This handbook contains supplemental information to the BTR installation and operation manual. A.O. Smith Water Products Service Handbook Irving, Texas ©2000 1 Training Department BTR TANK TYPE HEATERS SERVICE HANDBOOK Qualifications: Installation or service of this water heater requires ability equivalent to that of a licensed tradesman in the field involved. Plumbing, air supply, venting, gas supply and electrical testing skills are required. Tools Required: • Phillips head screwdriver • standard screwdrivers • a 3/8 and 7/16 inch open end wrench • setofmarkeddrill bits • an electrical multimeter tester capable of measuring continuity • gas pressure gauge or manometer (gauge -AOS pt. no. 8099-2) • water pressure gauge (AOS pt. no. 4798) • thermometer (AOS pt no. 4870 -range 0 -220 degree F) • 1/2 inch socket with extension for removal of the clean out cover, • 1 1/16 inch socket with extension for anode removal. MISC: TC-043 Revision 1 vs. TC-043 Revision 1: • Adds Additional model’s information. • Adds cover statement this Handbook’s also a Service Handbook for many BTC Models. • Includes Power vent kit information. • Includes BTR/C-500 gas valve information. • Updated Damper illustrations. Revision2: • Revised Part Numbers on Page 15 Revision 3: • Adds information unique to the Efflkal damper equipped (Series 110, 111 and Retrofit) models A.O. Smith Water Products Service Handbook Irving, Texas ©2000 2 Training Department BTR TANK TYPE HEATERS SERVICE HANDBOOK INSTALLATION This portion of the handbook will review some often overlooked installation considerations, taking note of necessary installation requirements for the BTR 120 through 500 model heaters. The installation manual covers most of these items in detail. CLEARANCES FROM COMBUSTIBLES Clearance to Combustibles Table MODEL A B C 120 -200 1” (2.54CM) 1” (2.54CM) 1” (2.54CM) 250 -305 2” (5.08CM) 2” (5.08CM) 2” (5.08CM) 365 -500 3” (7.75CM) 3” (7.75CM) 3” (7.75CM) A 24 inch clearance for all serviceable parts is recommended. Clearances may vary between BTR models – See instruction manual or the label on the heater, for clearances applicable to your specific model. A.O. Smith Water Products Service Handbook Irving, Texas ©2000 3 Training Department BTR TANK TYPE HEATERS SERVICE HANDBOOK EXTERIOR CLEARANCE "Copyright by the American Gas Association. Used by permission of the copyright holder". This illustrates the exterior roof clearances for BTR units with natural draft venting. The vent shall extend at least 3 feet above the highest point where it passes through a roof of a building, and at least 2 feet higher than any portion of a building within a horizontal distance of 10 feet (for vents of 12" in diameter or less). (NFPA 54 ANSI Z 223.1 SEC 7.5.2a). (Sec 7.6.2a may allow reduction to 8 feet with a “ Listed vent cap”). A.O. Smith Water Products Service Handbook Irving, Texas ©2000 4 Training Department BTR TANK TYPE HEATERS SERVICE HANDBOOK AIR FOR COMBUSTION 10 CUBIC FEET OF AIR PER 1,000 BTU 111,,,000000000 BBBTTTUUU + 10 CU. FT. COMB. AIR 2.5 CU. FT. EXCESS AIR Stoichiometric or theoretical complete combustion requires 10 cubic feet of air per 1000 BTUH input of the gas input. The National Fuel Gas Code also recommends an additional 2.5 cu.ft. of "excess" air. This 12.5 cu.ft minimum supply air per 1000 BTUH input applies to natural and propane gas models. The National Fuel Gas Code also specifies minimum make-up air opening sizes for various building installations. (Ref: NFPA 54, ANSI Z223.1, sec 5.3) A.O. Smith Water Products Service Handbook Irving, Texas ©2000 5 Training Department BTR TANK TYPE HEATERS SERVICE HANDBOOK MAKE-UP AIR DIRECT COMMUNICATION 1 Square Inch Per 4,000 BTUH A fresh supply of make-up air for combustion can be supplied to the heater through make-up air ducts which directly communicate with the out of doors. Two openings are required -one within 12 inches of the top of the enclosure and one within twelve inches of the bottom of the enclosure. Each opening shall have a free area of not less than 1 s...