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MODELS BTI 120 THRU 400/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 PRINTED OR OUTLINED IN RED CONTAINS
INFORMATION RELATIVE TO YOUR SAFETY. PLEASE READ
THOROUGHLY BEFORE INSTALLING AND USING THIS
APPLIANCE.
A DIVISION OF A. O. SMITH CORPORATION
McBEE, SOUTH CAROLINA
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ROUGH-IN-DIMENSIONS TOP TOP OUTLET F INLET 1 1/2” NPT 1 1/2” NPT FRONT VIEW TOP VIEW BACK VIEW TABLE 1. ROUGH-IN-DIMENSIONS Model BTI-120 BTI-154 BTI-180 BTI-199 BTI-200 BTI-250 BTI-275 BTI-310 BTI-366 BTI-400 Dim. Inches mm Inches mm Inches mm Inches mm Inches mm Inches mm Inches mm Inches mm Inches mm Inches mm A 63 1800 70 1778 70 1778 70 1778 72 1829 72 1829 72 1829 73 1854 73 1854 73 1854 B 4 1/4 108 4 1/4 108 4 1/4 108 4 1/4 108 4 1/2 114 4 1/2 114 4 1/2 114 4 1/2 114 4 1/2 114 4 1/2 114 C
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TABLE OF CONTENTS Page Page ROUGH-IN-DIMENSIONS ................................................ 2 Gas Pressure Regulator .............................................. 12 FOREWORD ..................................................................... 3 Heater Wiring................................................................ 13 GENERAL SAFETY INFORMATION .................................. 4 INSTALLATION DIAGRAMS............................................... 14-20 Precautions ...............
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The venting of the water heater should be inspected by a qualified GENERAL SAFETY service technician at the time of installation and periodically thereafter to ensure a down-draft condition does not exist. INFORMATION DO NOT OBSTRUCT THE FLOW OF COMBUSTION AND PRECAUTIONS VENTILATING AIR. ADEQUATE AIR FOR COMBUSTION AND VENTILATION MUST BE PROVIDED FOR SAFE OPERATION. DO NOT USE THIS APPLIANCE IF ANY PART HAS BEEN UNDER WATER. Immediately call a qualified service technician to inspect LIQUID P
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• Do not apply insulation to the top of the water heater, as this aligned with the top of the inlet spud. A label above the jacket will interfere with safe operation of drafthood. hole has an arrow that will point to the marked portion of the pipe • Do not cover the temperature & pressure relief valve. nipple if the orientation is correct. If the arrow does not point • Do not cover the instruction manual. Keep it on the side of the within the marked range on the pipe nipple, adjust the pipe
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ELECTRONIC IGNITION CONTROL DISHWASHING MACHINE REQUIREMENT Each heater is equipped with a ignition module. The solid state These appliances meet the National Sanitation Foundation ignition control (Fig. 4), ignites the main burner by utilizing a Standard for sanitary installations when used with the following silicone nitride ignitor. The silicone nitride ignitor shuts off during leg kits, Part No’s. 6570-0 and 6570-7. the heating cycle and the main burner flame is sensed through All dishwash
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WARNING CLEARANCES TO NONCOMBUSTION CONSTRUCTION FLAMMABLE ITEMS, PRESSURIZED CONTAINERS OR ANY MODEL ”A” ”B” ”C” ”D” OTHER POTENTIAL FIRE HAZARDOUS ARTICLES MUST RIGHT SIDE LEFT SIDE BACK CEILING NEVER BE PLACED ON OR ADJACENT TO THE HEATER. OPEN BTI-120 0 0 0 12” (305mm) CONTAINERS OR FLAMMABLE MATERIAL SHOULD NOT BE BTI-154 0 0 0 12” (305mm) STORED OR USED IN THE SAME ROOM WITH THE HEATER. BTI-180 3” (76mm) 3” (76mm) 3” (76mm) 12” (305mm) BTI-199 3” (76mm) 3” (76mm) 3” (76mm) 12” (305mm) Wh
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ILLUSTRATION OF MINIMUM COMBUSTIBLE CLEARANCES IN AN ALCOVE - FIGURE 6 AND ONE IN OR WITHIN 12 INCHES (30.5cm) OF THE maximum speed. Close fireplace dampers. ENCLOSURE BOTTOM. Each opening shall have a free area of 4. Follow the lighting instruction. Place the water heater being 2 at least one square inch per 1000 Btuh (2,225mm /kW)of the inspected in operation. Adjust thermostat so appliance shall total input of all appliances in the enclosure, but not less than operate continuously. 100 sq
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TECHNICAL DATA VENTING TYPE B GAS VENT Multiple Gas Fired Tank-Type Heaters When venting multiple tank type heaters using Type B vent pipe, follow the installation diagram (figure 4) and tables below which give sizing and data based upon NFPA 54/ANSI Z223. 1992. MODEL BTI-120 Input: 120,000 Btu/hr Total Vent Height (Feet) Vent Connector Size: 5 inches 6 8 10 15 20 30 50 100 Input Btu/hr Rise Vent Connector Diameter (Inches) 120,000 1 Ft. 6 6 5 5 5 5 5 5 120,000 2 Ft. 5 5 5 5 5 5 5 5 120,000 3 F
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TECHNICAL DATA VENTING (Continued) MODEL BTI-250 Input: 250,000 Btu/hr Total Vent Height (Feet) Vent Connector Size: 6 inches 6 8 10 15 20 30 50 100 Input Btuh/hr Rise Vent Connector Diameter (Inches) 250,000 1 Ft 8 8 7 7 7 6 6 6 250,000 2 Ft 7 7 7 7 6 6 6 6 250,000 3 Ft 7 7 7 7 6 6 6 6 Number Combined Input BTI 250 of Heaters in Thousands of Btu/hr Manifold and Common Vent Diameter (Inches) 2 500,000 9 9 9 8 8 7 7 7 3 750,000 12 12 10 10 10 9 8 8 4 1,000,000 14 14 12 12 10 10 9 9 MODEL BTI-275
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WATER LINE CONNECTIONS RELIEF VALVE This manual provides detailed installation diagrams (see pages This water heater is equipped with a combination temperature-pressure relief valve that complies with the standard 15-21 of this manual) for typical methods of application for the for relief valves and automatic gas shutoff devices for hot water water heaters. supply system, ANSI Z21.22. FOR SAFE OPERATION OF THE WATER HEATER, THE RELIEF VALVE(S) MUST NOT BE The water heater may be installed by i
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MALFUNCTION OF THE SUPPLY SYSTEM, THE GAS VALVE GAS PIPING AND DIRT LEG INSTALLATION MUST BE CHECKED FOR SAFE OPERATION. MAKE SURE THAT THE OUTSIDE VENTS ON THE SUPPLY REGULATORS AND THE SAFETY VENT VALVES ARE PROTECTED AGAINST BLOCKAGE. THESE ARE PARTS OF THE GAS SUPPLY SYSTEM, NOT THE HEATER. VENT BLOCKAGE MAY OCCUR DURING ICE STORMS. TABLE 6 - GAS SUPPLY LINE SIZES (IN INCHES)* MAXIMUM CAPACITY OF PIPE IN CUBIC FEET PER HOUR LENGTH NOMINAL IRON PIPE SIZES (INCHES) IN FEET 1/2" 3/4" 1" 1 1
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HEATER WIRING All electrical work must be installed in accordance with the latest version of the National Electrical Code ANSI/NFPA No. 70, must conform to all local code authority having jurisdiction. AN ELECTRICAL GROUND IS REQUIRED TO REDUCE RISK OF ELECTRICAL SHOCK OR POSSIBLE ELECTROCUTION. If any of the original wire as supplied with the appliance must be 0 0 replaced, use only type 105 C thermoplastic or equivalent. 250 C type F must be used for the flame sensor leads and the spark 0 i
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INSTALLATION DIAGRAMS-TOP INLET/OUTLET USAGE Use of the top inlet water connection requires installation of an GENERAL inlet dip tube (refer to figure 11). The tube is supplied in the heater. Follow caution labels if applying heat to this fitting. Do not The type, size and location of the relief valves must be in allow pipe dope to contact the plastic tube during installation. accordance with local codes. The locations of the relief valves shown in the installation diagrams are typical. The h
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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 25. 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 15
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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 TEMPERATURE AT FIXTURES. SEE WATER TEMPERATURE CONTROL CIRCULATION. INSTALL ON OR CLOSE TO DISHWASHING WARNING ON PAGE 25. IF HIGHER PREHEAT TEMPERATURES ARE MACHINE. TOGGLE SWITCH MUST BE CLOSED (ON) DURING NECESSARY TO OBTAIN ADEQUATE BOOSTER OUTPUT, ADD AN ANTI- THE RINSE OPERATION AND OPEN (OFF
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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 25. 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 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 25. 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 19
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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
