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MODELS BTR 151 THRU 201/A
COMMERCIAL GAS, GLASS-LINED, TANK-TYPE WATER HEATER
• INSTALLATION • OPERATION • 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 products.
CAUTION
TEXT IN BLACK BOLD TYPE OR UNDERLINED CONTAINS
INFORMATION RELATIVE TO YOUR SAFETY. PLEASE READ
THOROUGHLY BEFORE INSTALLING AND USING THIS
APPLIANCE.
A DIVISION OF A. O. SMITH CORPORATION
McBEE, SOUTH CA
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FIGURE 1 ROUGH-IN-DIMENSIONS TABLE 1 - HEATER PERFORMANCE DATA Input Approx. RECOVERY RATING CAPACITIES (GPH) AT TEMPERATURE RISE SHOWN Rate Tank Approx. F 20°F 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. Eff. % C 11°C 17°C 22°C 28°C 33°C 39°C 44°C 50°C 56°C 61°C 67°C 72°C 78°C BTR-151 150,000 NAT 32 Gal 80 GPH 727 485 364 291 242 208 182 162 145 132 121 112 104 44 kW/Hr. NAT 121 Litres LPH 2752 1836 1378 1102 916 787 689 613 549 500 458 424 394 BTR-151 150,0
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TABLE OF CONTENTS Page Page ROUGH-IN-DIMENSIONS ..................................................... 2 INSTALLATION DIAGRAMS................................................ 11-17 FOREWORD .......................................................................... 2 OPERATION ......................................................................... 18 GENERAL SAFETY INFORMATION ....................................... 3 General ......................................................................
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OPERATION OF THESE FANS CAN PRODUCE A NEGATIVE As elevation above sea level is increased, there is less oxygen DRAFT IN THE AREA OF THE WATER HEATER PREVENTING per cubic foot of air. Therefore, the heater input rate should be THE PRODUCTS OF COMBUSTION FROM EXHAUSTING reduced at high altitudes for satisfactory operation with the THROUGH THE CHIMNEY OR VENT PIPE. reduced oxygen supply. Failure to make this reduction would result in an overfiring of the heater causing sooting, poor The venting o
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possibility of changing the orientation by accidentally EXHAUST INDUCER (BLOWER ASSEMBLY) overtightening the inlet supply. Improper orientation of the Eliminator may cause temperature buildup issues or spells of All units are equipped with a exhaust inducer. The inducer colder than usual water temperatures. assists in drawing in fresh air to the unit for combustion and then assists in dispensing the combustion by-products into the HIGH LIMIT SWITCH venting leading outside. The digital thermost
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WHEN SUCH LOCATIONS CANNOT BE AVOIDED, A SUITABLE INSTALLATION INSTRUCTIONS DRAIN PAN SHOULD BE INSTALLED UNDER THE HEATER. Such pans should be fabricated with sides at least 2" deep, with length and width at least 2" greater than the diameter of the heater and REQUIRED ABILITY must be piped to an adequate drain. The pan must not restrict combustion air flow. INSTALLATION OR SERVICE OF THIS WATER HEATER REQUIRES ABILITY EQUIVALENT TO THAT OF A LICENSED For appliance installation locations with
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FIGURE 6 - ILLUSTRATION OF MINIMUM COMBUSTIBLE CLEARANCES IN AN ALCOVE CARBONING OR SOOTING OF THE COMBUSTION CHAMBER, Remove all soot or other obstructions from the chimney that will BURNERS AND FLUE TUBES AND CREATES A RISK OF retard a free draft. ASPHYXIATION. Type B venting is recommended with these heaters. Where an exhaust fan is supplied in the same room with a heater, sufficient openings for air must be provided in the walls. This water heater must be vented in compliance with all local
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CAUTION A closed system will exist if a check valve (without bypass), pressure reducing valve (without bypass), or a water meter (without bypass) is installed in the cold water line between the water heater and street main (or well). Excessive pressure may develop in such closed systems, FIGURE 7 causing premature tank failure or intermittent relief valve operation. This is not a warranty failure. An expansion tank • Where a separate vent connection is not available and the or a simil
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To prevent damage, care must be taken not to apply too much GAS PIPING torque when attaching gas supply pipe to gas valve inlet. Contact your local gas service company to ensure that adequate Apply joint compounds (pipe dope) sparingly and only to the gas service is available and to review applicable installation male threads of pipe joints. Do not apply compounds to the first codes for your area. two threads. Use compounds resistant to the action of liquefied petroleum gases. Size the main ga
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Do not subject the combination gas valve to inlet gas conform to all local code authority having jurisdiction. AN pressures of more than 14.0" W.C. - natural gas. A service ELECTRICAL GROUND IS REQUIRED TO REDUCE RISK OF regulator is necessary if higher gas pressures are encountered. ELECTRICAL SHOCK OR POSSIBLE ELECTROCUTION. Manifold gas pressure in inches of water column is 3.5. If any of the original wire as supplied with the appliance must be 0 0 The gas pressure specified refers to flow
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capacity is installed on the heater. The locations shown in the INSTALLATION DIAGRAMS installation diagrams on the following pages are typical. The discharge opening of the temperature and pressure relief GENERAL valve, located in front of the heater must be piped to an open drain and should not be subject to freezing temperatures. The type, size and location of the relief valves must be in accordance with local codes. The locations of the relief valves Install in accordance with all local co
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VERTICAL STORAGE TANK AND FORCED CIRCULATION DANGER TEMPERATURE SETTING SHOULD NOT EXCEED SAFE USE TEMPERATURE AT FIXTURES. SEE WATER TEMPERATURE CONTROL WARNING ON PAGE 20. 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 12
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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 CONTROL WARNING ON PAGE 20. IF HIGHER PREHEAT TEMPERATURES ARE MACHINE. TOGGLE SWITCH MUST BE CLOSED (ON) DURING NECESSARY TO OBTAIN ADEQUATE BOOSTER OUTPUT, ADD AN THE RINSE OPERATION AND OPEN (OFF) WHE
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INSTALLATION DIAGRAMS-SIDE INLET/OUTLET USAGE A listed temperature and pressure relief valve of adequate The discharge opening of the temperature and pressure relief capacity is installed on the heater. The locations shown in the valve must be piped to an open drain and should not be subject installation diagrams on the following pages are typical. to freezing conditions. DO NOT REDUCE, BLOCK OR PLUG THE DISCHARGE OPENING OF THE VALVE. TWO TEMPERATURE - TWO HEATERS, ONE PRE-HEATER/ONE - BOOST
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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 20. IF HIGHER PREHEAT TEMPERATURES ARE NECESSARY TO OBTAIN ADEQUATE BOOSTER OUTPUT, ADD AN ANTI-SCALD VALVE FOR HOT WATER SUPPLIED TO FIXTURES. HEATER WITH MIXING VALVE AND RECIRCULATED SANITIZING LOOP NOTE 1: TOGGLE SWITCH CONTROLS 180°F (82°
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TWO TEMPERATURE - TWO PRE-HEATERS WITH MIXING VALVE OR BOOSTER HEATER WITH OR WITHOUT BUILING 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 20. IF HIGHER PREHEAT TEMPERATURES ARE NECESSARY TO OBTAIN ADEQUATE BOOSTER OUTPUT, ADD AN ANTI-SCALD VALVE FOR HOT WATER SUPPLIED TO FIXTURES. TWO PRE-HEATERS WITH BOOSTER HEATER 16
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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. IF BUILDING CIRCULATING LOOP IS USED, CONNECT TO AN OPENING NEAR THE BOTTOM OF THE TANK. HORIZONTAL STORAGE TANK CAUTION: IF BUILDING COLD WATER SUPPLY HAS A BACKFLOW PREVENTER, CHECK VALVE OR WAT
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into lockout. After the controller tries three times, it will wait one OPERATION hour before trying to light the unit again. This cycle will continue until the main burners are ignited or the unit is shut down. IMPORTANT ADJUSTMENTS A qualified person must perform the initial firing of the heater. At this time the user should not hesitate to ask the individual any ON INITIAL STARTUP SOME ADJUSTMENTS ARE NECESSARY. questions which they may have in regard to the operation and maintenance of the
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FOR YOUR SAFETY READ BEFORE OPERATING IF YOU DO NOT FOLLOW THESE INSTRUCTIONS EXACTLY A FIRE OR EXPLOSION WARNING MAY RESULT CAUSING PROPERTY DAMAGE, PERSONAL INJURY OR LOSS OF LIFE. A. This appliance does not have a pilot. It is equipped • If you cannot reach your gas supplier, call the fire with an ignition device which automatically lights the department. burner. Do not try to light the burner by hand. C. Use only your hand to push in or turn the gas control B. BEFORE OPERATING smell all ar
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set for 120° to 180°F water temperature, but 120°F is the WATER TEMPERATURE CONTROL recommended starting point. It is suggested the dial be placed on the lowest setting which produces an acceptable hot water supply. This will always give the most energy efficient operation. The temperature control has a 4°F (2°C) fixed differential. PREVENTIVE MAINTENANCE CHECK THE IGNITOR ASSEMBLY At least once a year, check the ignitor assembly, see Figure 11, and the main burner, see Figure 12, for proper
