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MODELS BTI 120 THRU 400/A
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 products.
Printed in U.S.A. 0803
•
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.
A DIVISION OF A. O. SMITH CORPORATION
McBEE, SOUTH CAROLINA, USA
www.hotwater.com
1
•
LIMITED WARRANTY
CAUTION
PART NO. 195809-000
SUPERSEDES PART NO.194780-000
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Summary of Contents for A.O. Smith BTI 120
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Page 1: Limited Warranty
MODELS BTI 120 THRU 400/A 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 products. Printed in U.S.A. 0803 OPERATION • MAINTENANCE TEXT PRINTED OR OUTLINED IN RED CONTAINS INFORMATION RELATIVE TO YOUR SAFETY. -
Page 2: Rough-In-Dimensions
Model Type of Gas Inches vs. W.C. Natrual BTI 120-400 Propane Minimum Supply Pressure, Natural Gas: 4.5 inches W.C. (1.12kPa) Minimum Supply Pressure, Propane Gas: 11.0 inches W.C. (1.74kPa) Minimum Pressures must be maintained under both load and no load (static and dynamic) conditions. -
Page 3: Table Of Contents
TABLE OF CONTENTS ROUGH-IN-DIMENSIONS ... FOREWORD ... GENERAL SAFETY INFORMATION ... Precautions ... Grounding Instructions ... Chemical Vapor Corrosion ... Improper Combustion ... Liquid Petroleum Models ... Extended non-use ... Insulation Blankets ... 4-5 High Altitude Installation ... FEATURES ... The Eliminator (Self-Cleaning System) ... -
Page 4: General Safety Information
Insulation blankets available to the general public for external use on gas water heaters are not approved for use on your A.O. Smith water heater. The purpose of an insulation blanket is to reduce the standby heat loss encountered with storage tank water heaters. -
Page 5: High Altitude Installation
• Do not cover the instruction manual. Keep it on the side of the water heater or nearby for future reference. • Do obtain new labels from A.O. Smith for placement on the blanket directly over the existing labels. HIGH ALTITUDE INSTALLATIONS... -
Page 6: Electronic Ignition Control
ELECTRONIC IGNITION CONTROL Each heater is equipped with a ignition module. The solid state ignition control (Fig. 4), ignites the main burner by utilizing a silicone nitride ignitor. The silicone nitride ignitor shuts off during the heating cycle and the main burner flame is sensed through a remote flame sensor integral to the silicone nitride ignitor assembly. -
Page 7: Levelling
WARNING FLAMMABLE ITEMS, PRESSURIZED CONTAINERS OR ANY OTHER POTENTIAL FIRE HAZARDOUS ARTICLES MUST NEVER BE PLACED ON OR ADJACENT TO THE HEATER. OPEN CONTAINERS OR FLAMMABLE MATERIAL SHOULD NOT BE STORED OR USED IN THE SAME ROOM WITH THE HEATER. When installing the heater, consideration must be given to proper location. -
Page 8: Venting
ILLUSTRATION OF MINIMUM COMBUSTIBLE CLEARANCES IN AN ALCOVE - FIGURE 6 AND ONE IN OR WITHIN 12 INCHES (30.5cm) OF THE ENCLOSURE BOTTOM. Each opening shall have a free area of at least one square inch per 1000 Btuh (2,225mm total input of all appliances in the enclosure, but not less than 100 square inches (645 square cm). -
Page 9: Technical Data Venting
NFPA 54/ANSI Z223. 1992. MODEL BTI-120 Input: 120,000 Btu/hr Vent Connector Size: 5 inches Input Btu/hr Number of Combined Input BTI 120 Heaters in Thousands of Btu/hr MODEL BTI-154 Input: 154,000 Btu/hr Vent Connector Size: 6 inches Input Btu/hr Number of... - Page 10 MODEL BTI-250 Input: 250,000 Btu/hr Vent Connector Size: 6 inches Input Btuh/hr Number Combined Input BTI 250 of Heaters in Thousands of Btu/hr 1,000,000 MODEL BTI-275 Input: 275,000 Btu/hr Vent Connector Size: 6 inches Input Btu/hr Number of Combined Input BTI 275 Heaters in Thousands of Btu/hr 1,100,000...
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Page 11: Water Line Connections
WATER LINE CONNECTIONS This manual provides detailed installation diagrams (see pages 15-21 of this manual) for typical methods of application for the water heaters. The water heater may be installed by itself, or with a separate storage tank, on both single and two-temperature systems. When used with a separate storage tank, the circulation may be either by gravity or by means of a circulating pump. -
Page 12: Purging
MALFUNCTION OF THE SUPPLY SYSTEM, THE GAS VALVE 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. -
Page 13: Heater Wiring
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. 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 replaced, use only type 105 C thermoplastic or equivalent. -
Page 14: Installation Diagrams-Top Inlet/Outlet Usage
INSTALLATION DIAGRAMS-TOP INLET/OUTLET USAGE GENERAL The type, size and location of the relief valves must be in accordance with local codes. The locations of the relief valves shown in the installation diagrams are typical. The heater has a factory installed high temperature limit switch and temperature and pressure relief valve. - Page 15 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...
- Page 16 TWO TEMPERATURE - ONE HEATER HIGH TEMPERATURE STORAGE WITH RECIRCULATION OF SANITIZING LOOP NOTE 1: TOGGLE SWITCH CONTROLS 180°F (82°C) WATER CIRCULATION. INSTALL ON OR CLOSE TO DISHWASHING MACHINE. TOGGLE SWITCH MUST BE CLOSED (ON) DURING THE RINSE OPERATION AND OPEN (OFF) WHEN DISHWASHER IS NOT OPERATING OR WHEN ON LONG STANDBY.
- Page 17 TO PRE-HEATER INLET. FROM BOOSTED TEMPERATURE LOOP, IF USED CONNECT TO BOOSTER INLET. † AVAILABLE FROM A.O. SMITH. PIPE RELIEF VALVE TO OPEN DRAIN. INSTALL IN ACCORDANCE WITH LOCAL CODES. The discharge opening of the temperature and pressure relief valve must be piped to an open drain and should not be subject to freezing conditions.
- Page 18 ONE OR TWO TEMPERATURE - ONE HEATERS, HIGH TEMPERATURE STORAGE WITH OR WITHOUT RECIRCULATION HEATER WITH OR WITHOUT MIXING VALVE HEATER WITH MIXING VALVE AND RECIRCULATED SANITIZING LOOP NOTE 1: * PIPE RELIEF VALVE TO OPEN DRAIN. INSTALL IN ACCORDANCE WITH LOCAL CODES.
- Page 19 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...
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Page 20: Vertical Storage Tank
MEDIUM TEMPERATURE - ONE HEATER WITH AUXILIARY STORAGE TANK FORCED CIRCULATION WITH OR WITHOUT BUILDING RECIRCULATION * 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 21: Manifold Kits
MANIFOLD KITS TWO UNIT MANIFOLD KIT (PART NO. 195686) THREE UNIT MANIFOLD KIT (PART NO. 195687) MODEL BTI-120 BTI-154 BTI-180 BTI-199 BTI-200/A BTI-250/A BTI-275/A BTI-310/A BTI-366/A BTI-400/A FOUR UNIT MANIFOLD KIT (PART NO. 195688) DIMENSION “A” 63” 70” 70” 70” 72”... -
Page 22: Operation
TABLE 8 APPROXIMATE TIME REQUIRED TO CONSUME 1 CU. FT. OF GAS AT FULL CAPACITY INPUT TYPE BTUH RATE PER 1 (BTUH) CU. FT. 120,000 NATURAL 1050 (35kW) PROPANE 2500 154,000 NATURAL 1050 (45kW) PROPANE 2500 180,000 NATURAL 1050 (53kW) PROPANE 2500 190,000... -
Page 23: Sequence Of Operation
SEQUENCE OF OPERATION The following information will describe the Sequence of Operation for this appliance. 1. Switch power on to unit. 2. Thermostat calls for heat. 3. Ignition Control Board performs diagnostic check on system components. 4. On completion of diagnostics check, the Ignition Control Board sends signal to Exhaust Inducer. -
Page 24: Lighting And Operation
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. This appliance does not have a pilot. It is equipped with an ignition device which automatically lights the burner. -
Page 25: Water Temperature Control
WATER TEMPERATURE CONTROL DANGER THIS WATER HEATER IS EQUIPPED WITH AN ADJUSTABLE THERMOSTAT TO CONTROL WATER TEMPERATURE. HOT WATER TEMPERATURES REQUIRED FOR AUTOMATIC DISHWASHER AND LAUNDRY USE CAN CAUSE SCALD BURNS RESULTING IN SERIOUS PERSONAL INJURY AND/ OR DEATH. THE TEMPERATURE AT WHICH INJURY OCCURS VARIES WITH THE PERSON'S AGE AND TIME OF EXPOSURE. -
Page 26: Gas Valves
NOTE: 1. Remove main burners from unit. 2. Check that burner venturi and ports are free of foreign debris. 3. Clean burners with bristle brush and/or vacuum cleaner - DO NOT distort burner ports or pilot location. 4. Reinstall burners in unit. Make sure front and rear of burners are installed correctly in burner support brackets. -
Page 27: Hot Water Odor
If the appliance installation includes other relief valves, such as in “remote” storage tanks etc., check their relief valve operation with the same frequency. WARNING THE WATER PASSING OUT OF THE VALVE DURING THIS CHECKING OPERATION MAY BE EXTREMELY HOT. AVOID CONTACT AND DISCHARGE SAFELY TO PREVENT WATER DAMAGE. -
Page 28: Deliming Solvents
BT-80 100 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, A.O. Smith Water Products Company: Telephone: (800) 433-2545 Fax: (800) 433-2515 Website: www.hotwater.com/parts... -
Page 29: Ignition Module System
Replacement parts may be ordered through A.O. Smith dealers, authorized servicers or distributors. Refer to the Yellow Pages for where to call or contact the A.O. Smith Water Products Company, Product Service Division, 5621 West 115th Street, Alsip, IL 60803, 1-800- 433-2545. When ordering parts be sure to state... -
Page 30: Sequence Of Operation Flow Chart
SEQUENCE OF OPERATION FLOW CHART Description of this flow chart can be found in the “SEQUENCE OF OPERATION” section found on page 23. Switch power on to unit. Thermostat calls for heat. Ignition Control Board performs diagnostic check on components Ignition Control Board sends power to Exhaust Inducer... -
Page 31: 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 be examined before using the checklist. -
Page 32: Plate
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.
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