A.O. Smith BTN 120 THRU 400/A Series General Safety Information, Precautions, Improper Combustion

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GENERAL SAFETY

INFORMATION

PRECAUTIONS

DO NOT USE THIS APPLIANCE IF ANY PART HAS BEEN UNDER WATER. Immediately call a qualified service technician to inspect the appliance and to replace any part of the control system and any gas control which has been under water.

IF THE UNIT IS EXPOSED TO THE FOLLOWING, DO NOT OPERATE HEATER UNTIL ALL CORRECTIVE STEPS HAVE BEEN MADE BY A QUALIFIED SERVICEMAN.

1.EXTERNAL FIRE.

2.DAMAGE.

3.FIRING WITHOUT WATER.

4.SOOTING

GROUNDING INSTRUCTIONS

This water heater must be grounded in accordance with the National Electric Code and/or local codes. These must be followed in all cases.

This water heater must be connected to a grounded metal, permanent wiring system; or an equipment grounding conductor must be run with the circuit conductors and connected to the equipment grounding terminal or lead on the water heater, see Figure 9.

CHEMICAL VAPOR CORROSION

GENERAL SAFETY WARNING

CORROSION OF THE FLUEWAYS AND VENT SYSTEM MAY OCCUR IF AIR FOR COMBUSTION CONTAINS CERTAIN CHEMICAL VAPORS. SUCH CORROSION MAY RESULT IN FAILURE AND RISK OF ASPHYXIATION.

Spray can propellants, cleaning solvents, refrigerator and air conditioning refrigerants, swimming pool chemicals, calcium and sodium chloride (water softener salt), waxes, and process chemicals and typical compounds which are potentially corrosive. Do not store products of this sort near the heater. Also, air which is brought in contact with a the heater should not contain any of these chemicals. If necessary, uncontaminated air should be obtained from remote or outside sources. The limited warranty is voided when failure of water heater is due to a corrosive atmosphere. (Refer to the limited warranty for complete terms and conditions.

IMPROPER COMBUSTION

PRECAUTIONS WARNING

ATTIC AND/OR EXHAUST FANS OPERATING ON THE PREMISES WITH A WATER HEATER CAN RESULT IN CARBON MONOXIDE POISONING AND DEATH.

OPERATION OF THESE FANS CAN PRODUCE A NEGATIVE DRAFT IN THE AREA OF THE WATER HEATER PREVENTING THE PRODUCTS OF COMBUSTION FROM EXHAUSTING THROUGH THE CHIMNEY OR VENT PIPE.

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 OBSTRUCT THE FLOW OF COMBUSTION AND VENTILATING AIR. ADEQUATE AIR FOR COMBUSTION AND VENTILATION MUST BE PROVIDED FOR SAFE OPERATION.

EXTENDED NON-USE PERIODS

GROUNDING INSTRUCTIONS WARNING

HYDROGEN GAS CAN BE PRODUCED IN A HOT WATER SYSTEM SERVED BY THIS HEATER THAT HAS NOT BEEN USED FOR A LONG PERIOD OF TIME (GENERALLY TWO WEEKS OR MORE). HYDROGEN GAS IS EXTREMELY FLAMMABLE. To reduce the risk of injury under these conditions, it is recommended that the hot water faucet be opened for several minutes at the kitchen sink before using any electrical appliance connected to the hot water system. If hydrogen is present, there will probably be an unusual sound such as air escaping through the pipe as the water begins to flow. THERE SHOULD BE NO SMOKING OR OPEN FLAME NEAR THE FAUCET AT THE TIME IT IS OPEN.

INSULATION BLANKETS

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. Your A.O. Smith water heater meets or exceeds the ASHRAE/IES 90.1b-1992 standards with respect to insulation and standby loss requirement making an insulation blanket unnecessary.

CHEMICAL VAPOR CORROSION WARNING

Should you choose to apply an insulation blanket to this heater, you should follow these instructions. Failure to follow these instructions can result in fire, asphyxiation , serious personal injury or death.

•Do not apply insulation to the top of the water heater, as this will interfere with safe operation of exhaust inducer.

•Do not cover gas valve on the temperature & pressure relief valve.

•Do not cover the instruction manual. Keep it on the side of the water heater or nearby for future reference.

•Do not allow insulation to come within 2” (5cm) of the burner, to prevent blockage of combustion air flow to the burners.

•Do not allow insulation to come within 9” (23cm) of the floor, (within 2” (5cm) of bottom cover) to prevent blockage of combustion air flow to the burners.

•Do inspect the insulation blanket frequently to make sure it does not sag, thereby obstructing combustion air flow.

•Do obtain new labels from A.O. Smith for placement on the blanket directly over the existing labels.

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Contents MODELS BTN 120 THRU 400/A Series INSTALLATION OPERATION MAINTENANCE LIMITED WARRANTYCOMMERCIAL GAS, GLASS-LINED, TANK-TYPE WATER HEATER ROUGH-IN-DIMENSIONS TABLE 1. ROUGH-IN-DIMENSIONSTABLE 3. GASAND ELECTRICAL CHARACTERISTICS FRONT VIEWTABLE OF CONTENTS FOREWORDGENERAL SAFETY INFORMATION PRECAUTIONSGROUNDING INSTRUCTIONS CHEMICAL VAPOR CORROSIONFEATURES HIGH ALTITUDE INSTALLATIONSHIGH LIMIT SWITCH ELECTRONIC IGNITION CONTROLCIRCULATING PUMP DISHWASHING MACHINE REQUIREMENTUNCRATING LOCATING THE HEATERLEVELING CLEARANCESHARD WATER AIR REQUIREMENTSVENTING MULTIPLE HEATER MANIFOLDUNCONFINED SPACE CONFINED SPACETABLE 6. TECHNICAL DATA VENTING TYPE B GAS VENT Multiple Gas Fired Tank-Type HeatersTABLE 6. TECHNICAL DATA VENTING Continued WATER LINE CONNECTIONS WATER POTABLE HEATING AND SPACE HEATING See pagesTHERMOMETERS Not Supplied RELIEF VALVEINSTALLATION DIAGRAMS-TOP INLET/OUTLET USAGE GENERALCODE RESTRICTIONS DANGERVERTICAL STORAGE TANK AND FORCED CIRCULATION HORIZONTAL STORAGE TANK AND FORCED CIRCULATIONTEMPERATURE SETTING SHOULD NOT EXCEED SAFE USE TEMPERATURE AT FIXTURES. SEE WATER TEMPERATURE CONTROLTWO TEMPERATURE - ONE HEATER HIGH TEMPERATURE STORAGE WITH RECIRCULATION OF SANITIZING LOOPTWO TEMPERATURE - TWO HEATERS, ONE PRE-HEATER/ONE - BOOSTER HEATER INSTALLATION DIAGRAMS-SIDE INLET/OUTLET USAGEWITH OR WITHOUT BUILDING RECIRCULATION ONE OR TWO TEMPERATURE - ONE HEATERS,HIGH TEMPERATURE STORAGE WITH OR WITHOUT RECIRCULATIONHEATER WITH OR WITHOUT MIXING VALVE HEATER WITH MIXING VALVE AND RECIRCULATED SANITIZING LOOPTWO TEMPERATURE - TWO PRE-HEATERS WITH MIXING VALVE OR BOOSTER HEATER WITH OR WITHOUT BUILING RECIRCULATIONTWO PRE-HEATERS WITH MIXING VALVE TWO PRE-HEATERS WITH BOOSTER HEATERMEDIUM TEMPERATURE - ONE HEATER WITH AUXILIARY STORAGE TANK FORCED CIRCULATION WITH OR WITHOUT BUILDING RECIRCULATIONVERTICAL STORAGE TANK HORIZONTAL STORAGE TANKMANIFOLD KITS TWO UNIT MANIFOLD KITTHREE UNIT MANIFOLD KIT FOUR UNIT MANIFOLD KITHEATER WIRING FIGURE 9 - SINGLE UNIT WIRING DIAGRAM BTN-120 THROUGH 400AGAS PIPING GAS PRESSURE REGULATORTABLE 7 - GAS SUPPLY LINE SIZES IN INCHES MAXIMUM CAPACITY OF PIPE IN CUBIC FEET PER HOUROPERATION MANIFOLD GAS PRESSURE IN INCHES OF WATER COLUMN ALL MODELSAPPROXIMATE TIME REQUIRED TO CONSUME 1 CU. FT. OF GAS AT FULL CAPACITYSEQUENCE OF OPERATION LIGHTING AND OPERATION INSTRUCTIONS FOR YOUR SAFETY READ BEFORE OPERATINGOPERATING INSTRUCTIONS PREVENTIVE MAINTENANCE CHECK THE IGNITOR ASSEMBLYIGNITOR ASSEMBLY WATER TEMPERATURE CONTROLMAIN BURNER GAS VALVESCHECKING THE INPUT FIGURE 11, IGNITORVENTING SYSTEM REMOTE STORAGE TANK TEMPERATURE CONTROLHOT WATER ODOR ANODE ROD INSPECTIONRECOMMENDED PROCEDURE FOR TANK CLEANOUT PROCEDUREDELIMING SOLVENTS DELIMING USING FLO-JUG METHODSERVICE SYSTEM DIAGNOSTICSIGNITION MODULE SYSTEM ELECTRICAL SERVICINGSEQUENCE OF OPERATION FLOW CHART REPLACEMENT PARTS, SERVICE HANDBOOKS AND TRAINING AIDSREPLACEMENT PARTS OPERATIONAL CHECKLIST SERVICEMANREMEDY COMPLAINTModel BTN Limited Warranty 4. SERVICEANDREPAIREXPENSES6. CLAIMPROCEDURE KEEPTHISWARRANTYPOSTEDADJACENTTOTHEHEATERFORFUTUREREFERENCE
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