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MODELS BTN 120 THRU 400/A Series 108
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, SOU
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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 BTN-120 BTN-154 BTN-180 BTN-199 BTN-200 BTN-250 BTN-275 BTN-310 BTN-366 BTN-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 68 1727 72 1829 72 1829 72 1829 72 1829 72 1829 73 1854 73 1854 73 1854 B 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 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 Piping ---------------------------------------------------- 21 FOREWORD ------------------------------------------------- 3 Purging -------------------------------------------------------- 21 GENERAL SAFETY INFORMATION -------------------- 4 Gas Pressure Regulator---------------------------------- 21-22 Precautions --------------------------------------------------- 4 OPERATION --------------------------------
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OPERATION OF THESE FANS CAN PRODUCE A NEGATIVE GENERAL SAFETY DRAFT IN THE AREA OF THE WATER HEATER PREVENTING THE PRODUCTS OF COMBUSTION FROM EXHAUSTING INFORMATION THROUGH THE CHIMNEY OR VENT PIPE. PRECAUTIONS The venting of the water heater should be inspected by a qualified service technician at the time of installation and periodically thereafter to ensure a down-draft condition does not exist. DO NOT USE THIS APPLIANCE IF ANY PART HAS BEEN UNDER WATER. Immediately call a qualified service
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Continued manual resetting of high limit control, preceded by HIGH ALTITUDE INSTALLATIONS higher than usual water temperature is evidence of high limit switch operation. The following is a possible reason for high WARNING limit switch operation: INSTALLATIONS ABOVE 2000 FEET (610 METERS) REQUIRE REPLACEMENT OF THE BURNER ORIFICE IN ACCORDANCE • A malfunction in the thermostatic controls would allow the WITH SECTION 8.1.2 OF THE NATIONAL FUEL GAS CODE (ANSI gas valve to remain open causing wate
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The exhaust inducer is equipped with a gravity controlled damper SUPPLY, VENTING, GAS SUPPLY AND ELECTRICAL WORK ARE to reduce the amount of heat loss through the flue, improving REQUIRED. efficiency. WARNING FAILURE TO FOLLOW THESE INSTRUCTIONS CAN RESULT IN SERIOUS PERSONAL INJURY OR DEATH. UNCRATING The heater is shipped with the inducer already installed. The wiring conduit runs from the thermostat to the inducer. Before turning unit on, check to make sure the wiring condu
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length and width at least 2" greater than the diameter of the CLEARANCES TO NONCOMBUSTION CONSTRUCTION heater and must be piped to an adequate drain. The pan must MODEL ”A” ”B” ”C” ”D” not restrict combustion air flow. RIGHT LEFT BACK CEILING SIDE SIDE LEVELING BTN-120 0 0 0 12” (305mm) BTN-154 0 0 0 12” (305mm) BTN-180 0 0 0 12” (305mm) If the unit is not level, insert the bolts which were used in crating BTN-199 0 0 0 12” (305mm) into the legs to correct this condition. BTN-200/A 0 0 0 12” (3
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BURNERS AND FLUE TUBES AND CREATES A RISK OF Heater must be protected from freezing downdrafts. ASPHYXIATION. Remove all soot or other obstructions from the chimney that will Where an exhaust fan is supplied in the same room with a retard a free draft. heater, sufficient openings for air must be provided in the walls. UNDERSIZED OPENINGS WILL CAUSE AIR TO BE DRAWN Type B venting is recommended with these heaters. For typical INTO THE ROOM THROUGH THE CHIMNEY, CAUSING POOR venting application see
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TABLE 6. 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 BTN-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 12
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TABLE 6. TECHNICAL DATA VENTING (Continued) MODEL BTN-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 BTN 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 MODE
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SYSTEM CONNECTIONS WATER LINE CONNECTIONS The system installation must conform to these instructions and This manual provides detailed installation diagrams (see pages to the local code authority having jurisdiction. Good practice 13-19 of this manual) for typical methods of application for the requires that all heavy piping be supported. water heater(s). The water heater may be installed by itself, or with a separate THERMOMETERS (Not Supplied) storage tank, on both single and two-temperature
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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 8). The tube is supplied in the heater. Follow caution labels if applying heat to this fitting. Do The type, size and location of the relief valves must be in not 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
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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 13
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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 (OF
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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°C
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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 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 17
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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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MANIFOLD KITS TWO UNIT MANIFOLD KIT (PART NO. 78692) MODEL DIMENSION “A” BTN-120 63” BTN-154 68” BTN-180 72” BTN-199 72” BTN-200/A 72” BTN-250/A 72” BTN-275/A 72” BTN-310/A 73” BTN-366/A 73” BTN-400/A 73” THREE UNIT MANIFOLD KIT (PART NO. 78593) FOUR UNIT MANIFOLD KIT (PART NO. 78694) 19
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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
