A.O. Smith BTR120 Installation Operation & Maintenance
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A.O. Smith BTR120 Installation Operation & Maintenance

Commercial gas, glass-lined, tank-type water heater
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MODELS BTR(C)120 THRU 400A
COMMERCIAL GAS, GLASS-LINED, TANK-TYPE WATER HEATER
•
INSTALLATION
Thank you for buying this energy efficient water heater from
A.O. Smith Water Products Company. We appreciate your
confidence in our product.
PRINTED IN U.S.A. 0706
•
OPERATION
•
PLACE THESE INSTRUCTIONS ADJACENT TO HEATER
AND NOTIFY OWNER TO KEEP FOR FUTURE REFERENCE.
MAINTENANCE
•
TEXT PRINTED OR OUTLINED IN RED CONTAINS
INFORMATION RELATIVE TO YOUR SAFETY. PLEASE READ
THOROUGHLY BEFORE INSTALLING AND USING THIS
APPLIANCE.
500 Tennessee Waltz Parkway, Ashland City, TN 37015
Phone: 800-527-1953 Fax: 800-433-2515
1
LIMITED WARRANTY
CAUTION
www.hotwater.com
PART NO. 197283-000

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Summary of Contents for A.O. Smith BTR120

  • Page 1 MAINTENANCE • LIMITED WARRANTY Thank you for buying this energy efficient water heater from A.O. Smith Water Products Company. We appreciate your confidence in our product. CAUTION TEXT PRINTED OR OUTLINED IN RED CONTAINS INFORMATION RELATIVE TO YOUR SAFETY. PLEASE READ THOROUGHLY BEFORE INSTALLING AND USING THIS APPLIANCE.

  • Page 2: Rough-In-Dimensions

    APPROX. VENT CONNECTIONS Approximate RATE TANK INLET INLET OUTLET ship. Weight BTU/Hr. CAP. TOP FRONT BACK TOP FRONT BACK STD. ASME BTR120 120,000 BTU/Hr. 71 Gal 69.75" 4.25" 59.50" 50.87" 19.69" 19" 1/2" 51.88" 5" 27.75" 1.50" 1.50" 1.50" 1.50"...
  • Page 3 TABLE 1C - HEATER PERFORMANCE DATA BTR MODELS INPUT APPROX. RECOVERY RATING CAPACITIES (GPH AND LPH) RATE EFF. 30° F 40° F 50° F 60° F 70° F 80° F 90° F 100° F 110° F 120° F 130° F 140° F MODEL BTUH CAP.

  • Page 4: Table Of Contents

    TABLE OF CONTENTS Page Page Grounding Instructions ---------------------------------------------- 15 ROUGH-IN-DIMENSIONS ---------------------------------------- 2-3 Heater Wiring ---------------------------------------------------------- 15 TABLE OF CONTENTS ---------------------------------------------- 4 INSTALLATION DIAGRAMS ---------------------------------- 15-21 FOREWORD ----------------------------------------------------------- 4 MANIFOLDS ----------------------------------------------------------- 22 GENERAL SAFETY INFORMATION ----------------------------- 5 MECHANICAL VENTING ------------------------------------------- 23 Chemical Vapor Corrosion ------------------------------------------ 5 Single Unit Installation ---------------------------------------------- 23 Improper Combustion ------------------------------------------------ 5...

  • Page 5: General Safety Information

    Smith water heater. The purpose of an insulation blanket is to WARNING reduce the standby heat loss encountered with storage tank water heaters. Your A.O. Smith water heater meets or exceeds the ATTIC AND/OR EXHAUST FANS OPERATING ON THE ANSI/ASHRAE/IESNA Standard 90.1 1999 with respect to...

  • Page 6: High Altitude Installation

    • Do obtain new labels from A.O. Smith for placement on the Also due to the input rating reduction required at high altitudes, blanket directly over the existing labels.

  • Page 7: Electronic Ignition Control

    500 Tennessee Waltz Parkway, Ashland City, TN 37015, than usual water temperature is evidence of high limit switch operation. 1-800-433-2545. In Canada, contact A.O. Smith Enterprises The following is a possible reason for high limit switch operation: LTD., P.O. Box, 310 - 768 Erie Street, Stratford, Ontario, Canada N5A 6T3, 1-800-265-8520.

  • Page 8: Installation Instructions

    The National Sanitation Foundation also recommends circulation NEVER BE PLACED ON OR ADJACENT TO THE HEATER. OPEN of 180°F (82°C) water. Where this is done, the circulation should CONTAINERS OR FLAMMABLE MATERIAL SHOULD NOT BE be very gentle so that it does not cause any unnecessary STORED OR USED IN THE SAME ROOM WITH THE HEATER.

  • Page 9: Installation On Combustible Flooring

    ILLUSTRATION OF MINIMUM COMBUSTIBLE CLEARANCES IN AN ALCOVE FIGURE 6 A service clearance of 24" (61cm) should be maintained from WARNING serviceable parts, such as relief valves, flue baffles, flue FOR SAFE OPERATION PROVIDE ADEQUATE AIR FOR damper devices, thermostats, cleanout openings or drain COMBUSTION AND VENTILATION.

  • Page 10: Confined Space

    CONFINED SPACE This water heater must be vented in compliance with all local codes, the current edition of the National Fuel Gas Code (ANSI- When drawing combustion and dilution air from inside a Z223.1) and with the Category I Venting Tables. conventionally constructed building to a confined space, such a space shall be provided with two permanent openings, ONE IN In Canada, venting shall conform to the requirements of the current...
  • Page 11 TECHNICAL DATA VENTING, TABLE 3 TYPE B GAS VENT Multiple Gas Fired Tank-Type Heaters When venting mutiple tank type heaters using Type B vent pipe, follow the installation diagram (figure 8) and tables below which give sizing and data based upon NFPA 54/ANSI Z223.
  • Page 12 TECHNICAL DATA VENTING, TABLE 3 (Continued) MODEL BTR(C)-250, 251 Input: 250,000, 251,000 Total Vent Height (Feet) Draft Hood: 6” Input Btuh Rise Vent Connector Diameter (in inches) 250/251,000 1 Ft. 250/251,000 250/251,000 3 Ft. Number Combined Input of Heaters in Thousands of Btuh Manifold and Common Vent Diameter (In inches) 500/502 750/753...

  • Page 13: Water (Potable) Heating And Space Heating

    If a water heater is installed in a closed water system, contact the be installed with a properly sized, rated and approved combination water supplier or local plumbing inspector on how to control this temperature (ANSI) and pressure (ASME) relief valve(s). situation.

  • Page 14: Gas Piping And Dirt Leg Installation

    GAGE- 3.5 kPa) SUPPLY GAS PRESSURE. EXPOSURE TO SUPPLIERS. REFER TO THE CURRENT EDITION OF THE HIGHER SUPPLY PRESSURE MAY CAUSE DAMAGE TO THE NATIONAL FUEL GAS CODE. For Canadian installations consult GAS VALVE WHICH COULD RESULT IN FIRE OR EXPLOSION. Natural Gas and Propane Installation Code CAN/CSA-B149.1.

  • Page 15: Gas Pressure Regulator

    Do not subject the combination gas valve to inlet gas BEFORE PLACING THE HEATER IN OPERATION, CHECK FOR pressures of more than 14.0" W.C. (3.48 kPa) - natural gas, GAS LEAKAGE. Use soap and water solution or other material 14.0" W.C. (3.48 kPa)- propane gas. A service regulator is acceptable for the purpose in locating the leaks.
  • Page 16 VERTICAL STORAGE TANK AND FORCED CIRCULATION DANGER TEMPERATURE SETTING SHOULD NOT EXCEED SAFE USE TEMPERATURE AT FIXTURES. SEE WATER TEMPERATURE CONTROL WARNING ON PAGE 27. IF HIGHER PREHEAT TEMPERATURES ARE NECESSARY TO OBTAIN ADEQUATE BOOSTER OUTPUT, ADD AN ANTI-SCALD VALVE FOR HOT WATER SUPPLIED TO FIXTURES. HORIZONTAL STORAGE TANK AND FORCED CIRCULATION...
  • Page 17 TWO TEMPERATURE - ONE HEATER HIGH TEMPERATURE STORAGE WITH RECIRCULATION OF SANITIZING LOOP DANGER NOTE 1: TOGGLE SWITCH CONTROLS 180°F (82°C) WATER TEMPERATURE SETTING SHOULD NOT EXCEED SAFE USE CIRCULATION. INSTALL ON OR CLOSE TO DISHWASHING TEMPERATURE AT FIXTURES. SEE WATER TEMPERATURE MACHINE.
  • Page 18 CIRCULATING RETURN LINE CONNECTIONS - FROM FIXTURE LOOP, IF USED, CONNECT TO PREHEATER INLET. - FROM BOOSTED TEMPERATURE LOOP, IF USED CONNECT TO BOOSTER INLET. †AVALAIBLE FROM A.O. SMITH. *PIPE RELIEF VALVE TO OPEN DRAIN. INSTALL IN ACCORDANCE WITH LOCAL CODES.
  • Page 19 ONE OR TWO TEMPERATURE - ONE HEATERS,HIGH TEMPERATURE STORAGE WITH OR WITHOUT RECIRCULATION HEATER WITH OR WITHOUT MIXING VALVE DANGER TEMPERATURE SETTING SHOULD NOT EXCEED SAFE USE TEMPERATURE AT FIXTURES. SEE WATER TEMPERATURE CONTROL WARNING ON PAGE 27. IF HIGHER PREHEAT TEMPERATURES ARE NECESSARY TO OBTAIN ADEQUATE BOOSTER OUTPUT, ADD AN ANTI-SCALD VALVE FOR HOT WATER...
  • Page 20 TWO TEMPERATURE - TWO PRE-HEATERS WITH MIXING VALVE OR BOOSTER HEATER WITH OR WITHOUT BUILDING RECIRCULATION TWO PRE-HEATERS WITH MIXING VALVE DANGER TEMPERATURE SETTING SHOULD NOT EXCEED SAFE USE TEMPERATURE AT FIXTURES. SEE WATER TEMPERATURE CONTROL WARNING ON PAGE 27. IF HIGHER PREHEAT TEMPERATURES ARE NECESSARY TO OBTAIN ADEQUATE BOOSTER OUTPUT, ADD AN ANTI-SCALD VALVE FOR HOT WATER...
  • Page 21 MEDIUM TEMPERATURE - ONE HEATER WITH AUXILIARY STORAGE TANK FORCED CIRCULATION WITH OR WITHOUT BUILDING RECIRCULATION VERTICAL STORAGE TANK * PIPE RELIEF VALVE TO OPEN DRAIN. **WHEN USING AN A.O. SMITH T-140, - 200, -350 OR -400 STORAGE TANK, USE LOWER 3/4” OPENING FOR TANK TEMPERATURE CONTROL.

  • Page 22: Manifolds

    MANIFOLD KITS TWO UNIT MANIFOLD KIT (PART NO. 195686) DIMENSIONS “A” INCHES (CM) MODEL LOW PROFILE VERTICAL HOOD “A” BTR MODELS BTRC MODELS 69.75” (177cm) 69.75” (177cm) 73.00” (185cm) 73.00” (185cm) 67.50” (171cm) 70.50” (179cm) 75.00 (192cm) 81.50” (207cm) 75.00” (192cm) 67.50”...

  • Page 23: Mechanical Venting

    2500 22.6 SEC. MULTIPLE UNIT INSTALLATIONS Figures shown are valid for 0-2000 ft.(0-610m) installations. See For multiple unit installations, contact A.O. Smith Water Products “HIGH ALTITUDE INSTALLATIONS” for deration requirements Company, Technical Support Center at 1-800-527-1953. In over 2000 ft.(610m).

  • Page 24: Operation

    PURGING OPERATION Gas line purging is required with new piping or systems in which air has entered. IMPORTANT A qualified person must perform the initial firing of the heater. At CAUTION this time the user should not hesitate to ask the individual any PURGING SHOULD BE PERFORMED BY PERSONS questions which they may have in regard to the operation and EXPERIENCED IN THIS TYPE GAS SERVICE.

  • Page 25: Lighting And Operating Labels

    FOR NATURAL GAS MODELS...
  • Page 26 FOR PROPANE GAS MODELS...

  • Page 27: Water Temperature Control

    ADJUSTMENTS that attach to faucets to limit hot water temperatures. Contact a licensed plumber or the local plumbing authority. ON INITIAL STARTUP SOME ADJUSTMENTS ARE NECESSARY. The water temperature is controlled by a thermostat, Fig. 3, which 1. CHECK MANIFOLD AND INLET GAS PRESSURES. has two sensing elements.

  • Page 28: Preventive Maintenance

    • The pilot flame should envelop sensing device with 5/8" (1.6cm) 2. Inspect the venting system for proper size and horizontal pitch, flame, fig. 16. Remove pilot adjustment cover screw, fig. 15. as required in the National Fuel Gas Code, ANSI Z223.1 or Turn inner adjustment screw clockwise to decrease, or the Natural Gas and Propane Installation Code CAN/CSA- counterclockwise to increase pilot flame.

  • Page 29: Gas Valves

    TYPICAL PILOT AND MAIN BURNER FLAMES If the gas valve becomes defective, repairs should not be attempted. A new valve should be installed in place of the defective one. CHECKING THE INPUT For appliance installation locations with elevations above 2000 feet (610 m), refer to HIGH ALTITUDE INSTALLATIONS section of this manual for input reduction procedure.

  • Page 30: Venting System

    the factory installed magnesium anodes with aluminum anodes VENTING SYSTEM may correct the condition. Examine the venting system every six months for obstructions Occasionally water softener companies recommend removal of and/or deterioration of the vent piping. heater anodes for odor reasons. Remove all soot or other obstructions from chimney which will retard free draft.

  • Page 31: Deliming Solvents

    BTR(C)120-500 models. UN•LIME with the necessary hoses and fittings to delime your heater is also available as a kit: Up-N-Down Transfer Kit. Contact your local A.O. Smith dealer, distributor or, The following practices will ensure longer life and enable the unit A.O.

  • Page 32: Troubleshooting Ignition Module System

    Refer to the Yellow Pages if not, the UN•LIME should be replaced. for where to call or contact A.O. Smith Water Heater Parts Fulfillment, 125 Southeast Parkway, Franklin, TN 37068 at 1-800-433-2545 or www.hotwater.com. For Canada contact: A.O.

  • Page 33: Effikal Flue Damper Troubleshooting Guide

    3. Make sure damper rod is not rubbing on pipe assembly. See figure on front page of this insert sheet IMPORTANT: DAMPER MUST BE OPEN BEFORE COMBUSTION TAKES PLACE. If all steps have been tried and damper problems persists call A.O. Smith Technical Center at 1-800-527-1953.

  • Page 34: Operational Checklist

    OPERATIONAL CHECKLIST This checklist in conjunction with “TROUBLESHOOTING” and the “SEQUENCE OF OPERATION” should be used as an on-the-job troubleshooting guide to identify the cause of incorrect system operation and suggest a remedy for its correction. Because improper piping and wiring can result in unsatisfactory system performance, it is suggested that the installation by examined before using the checklist.

  • Page 35: Limited Warranty

    Model BTR(C) Limited Warranty A. O. Smith Corporation, the warrantor, extends the following LIMITED WARRANTY to the owner of this water heater. 1. THE TANK If the glass-lined tank in this water heater shall prove upon examination by the warrantor to have leaked due to natural corrosion from potable water therein, during the first THREE years after initial installation, the warrantor will supply a complete new A.
  • Page 36 500 Tennessee Waltz Parkway, Ashland City, TN 37015 Phone: 800-527-1953 Fax: 800-433-2515 www.hotwater.com...

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