MODELS BT- 80 AND 100 COMMERCIAL GAS WATER HEATER Glass-Lined Tank-Type Water Heater • INSTALLATION • OPERATION • SERVICE • 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.
ROUGH-IN DIMENSIONS FIGURE 1. DIMENSIONS Model Units A B C D E F G H J K L M BT-80 Natural & LP Inches CM 61 1/8 155.25 58 1/2 148.6 29 11/16 75.4 26 1/2 67.3 15 3/16 38.6 4 10.2 14 1/2 39.4 16 40.6 1 1/4 3.2 1 NPT 1/2 NPT 11 15/16 30.3 BT-100 Natural Inches CM 69 3/4 177.2 66 1/2 168.9 29 11/16 75.4 26 1/2 67.3 15 3/16 38.6 4 10.2 14 1/2 39.4 16 40.6 1 1/4 3.2 1 1/4 NPT 1/2 NPT 11 15/16 30.3 BT-100 LP Inches CM 68 5/8 174.3 66 1/2 168.9 30 15/16 78.
TABLE OF CONTENTS ROUGH-IN DIMENSIONS ....................................................................... FOREWORD .......................................................................................... GENERAL SAFETY INFORMATION ...................................................... Precautions ....................................................................................... Chemical Vapor Corrosion ............................................................... Improper Combustion ...........
IF YOU EXPERIENCE AN OUT-OF-GAS SITUATION, DO NOT TRY TO RELIGHT APPLIANCES YOURSELF, ask your LP delivery person to relight pilots for you. Only trained LP professionals should conduct the required safety checks in accordance with industry standards. INSTALLATION INSTRUCTIONS EXTENDED NON-USE PERIODS INSTALLATION OR SERVICE OF THIS WATER HEATER REQUIRES ABILITY EQUIVALENT TO THAT OF A LICENSED TRADESMAN IN THE FIELD INVOLVED. PLUMBING, AIR SUPPLY, VENTING AND GAS SUPPLY WORK ARE REQUIRED.
state the model number and the altitude of the location where the water heater is being installed. Drain pans suitable for these heaters are available from your distributor or A. O. Smith Water Products Company, 5621 West 115th Street, Alsip, IL 60803. Upon completion of derating of the heater, adjustment to the gas pressure regulator may be required. See CHECKING THE INPUT section in this manual for inlet and manifold pressure requirements.
The installation instructions for confined spaces in tightly constructed buildings must be followed to ensure adequate air supply. Heater must be protected from freezing downdrafts. Remove all soot or other obstructions from the chimney that will retard a free draft. CONFINED SPACE Type B venting is recommended with these heaters.
VENT CONNECTION installed with a properly sized, rated and approved combination temperature (ANSI) and pressure (ASME) relief valve(s). Vent connections must be made to an adequate stack or chimney. Size and install proper size vent pipe. Do not reduce pipe size to less than that of the draft hood outlet. WARNING THE PURPOSE OF RELIEF VALVE IS TO AVOID EXCESSIVE PRESSURE OR TEMPERATURE INTO THE STEAM RANGE, WHICH MAY CAUSE SCALDING AT FIXTURES, TANK EXPLOSION, SYSTEM OR HEATER DAMAGE.
IT IS IMPORTANT TO GUARD AGAINST GAS VALVE FOULING FROM CONTAMINANTS IN THE GAS WAYS. SUCH FOULING MAY CAUSE IMPROPER OPERATION, FIRE OR EXPLOSION. GAS PIPING Contact your local gas service company to ensure that adequate gas service is available and to review applicable installation codes for your area. IF COPPER SUPPLY LINES ARE USED THEY MUST BE INTERNALLY TINNED AND CERTIFIED FOR GAS SERVICE. BEFORE ATTACHING THE GAS LINE, BE SURE THAT ALL GAS PIPE IS CLEAN ON THE INSIDE.
individual any questions which he may have in regard to the operation and maintenance of the unit. WARNING DO NOT ATTEMPT TO OPERATE WATER HEATER WITH COLD WATER INLET VALVE CLOSED. NEVER OPERATE THE HEATER WITHOUT FIRST BEING CERTAIN IT IS FILLED WITH WATER AND A TEMPERATURE AND PRESSURE RELIEF VALVE IS INSTALLED IN THE RELIEF VALVE OPENING OF THE HEATER. DO NOT ATTEMPT TO OPERATE HEATER WITH COLD WATER INLET VALVE CLOSED. TO OPERATE THE WATER HEATER 1.
FOR YOUR SAFETY READ BEFORE LIGHTING WARNING: If you do not follow these instructions exactly, a fire or explosion may result causing property damage, personal injury or loss of life. BEFORE LIGHTING: ENTIRE SYSTEM MUST BE FILLED WITH WATER AND AIR PURGED AT FAUCETS. • If you cannot reach your gas supplier, call the fire A. This appliance has a pilot which must be lighted by department. hand. When lighting the pilot, follow these instructions exactly. B. BEFORE LIGHTING smell all around the appliance C.
FOR YOUR SAFETY READ BEFORE LIGHTING WARNING: If you do not follow these instructions exactly, a fire or explosion may result causing property damage, personal injury or loss of life. BEFORE LIGHTING: ENTIRE SYSTEM MUST BE FILLED WITH WATER AND AIR PURGED AT FAUCETS. A. B. • This appliance has a pilot which must be lighted by hand. When lighting the pilot, follow these instructions exactly. BEFORE LIGHTING: smell all around the appliance area for gas.
It is recommended that lower water temperatures be used to avoid the risk of scalding. It is further recommended, in all cases, that the water temperature dial be set for the lowest temperature which satisfies your hot water needs. This will also provide the most energy efficient operation of the water heater. The water temperature adjusting dial was factory set at the lowest temperature; all the way clockwise to the mechanical stop.
WARNING FAILURE TO CORRECT BACK DRAFTS MAY CAUSE AIR CONTAMINATION AND UNSAFE CONDITIONS. • ignite rapidly; give reasonably quiet operation; cause no excessive flame lifting from the burner ports. Make sure that the flow of combustion and ventilation air is not blocked. If the back draft cannot be corrected by the normal method or if a suitable draft cannot be obtained, a blower type flue gas exhauster must be employed to assure proper venting and correct combustion.
WARNING SHOULD OVERHEATING OCCUR OR THE GAS SUPPLY FAIL TO SHUT OFF, TURN OFF THE MANUAL GAS CONTROL VALVE TO THE APPLIANCE. TABLE 3 INPUT CHECK TIME REQUIRED TO CONSUME 1 CU. FT. OF GAS Model BT-80 Type of Gas Natural BTU Per Cu. Ft. 1050 Approx. Time Required To Consume 1 Cu. Ft. of Gas 50.3 sec. BT-100 Propane Natural 2500 1050 119.8 sec. 50.3 sec. Propane 2500 119.8 sec. HOT WATER ODOR On occasion, hot water may develop a strong odor.
TANK CLEANOUT PROCEDURE PREVENTIVE MAINTENANCE The following practices will ensure longer life and enable the unit to operate at its designed efficiency: RECOMMENDED PROCEDURE FOR PERIODIC REMOVAL OF LIME DEPOSITS FROM TANK TYPE COMMERCIAL WATER HEATERS 1. Once a month the heater should be flushed. Open the drain valve and allow two gallons of water to drain from the heater. Inlet water valve should remain open to maintain pressure in tank.
DELIMING USING FLO-JUG METHOD UN•LIME in the 5 gallon size is recommended for deliming of the BT-80 and 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 or Website: www.hotwater.com.
• if excessive, can drip into the floor shield. Also, during normal operation there may be occasions when large quantities of water are drawn, chilling the tank bottom. This too can result in condensation. • Close the main shutoff valve in the gas supply pipe at the heater. See fig. 4, page 7. • Close the valve which feeds water to the cold water inlet at the top of the heater.
Model BT 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. O. Smith water heater of equivalent size and current model.
A.O. SMITH WATER PRODUCTS COMPANY 5621 W. 115TH STREET • ALSIP, ILLINOIS 60803 PHONE: 1-800-433-2545 • FAX: 1-800-433-2515 www.aosmithwaterheaters.com • E-MAIL: parts@hotwater.
