A.O. Smith BTN 120 THRU 400/A Series One Or Two Temperature - One Heaters,High Temperature

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ONE OR TWO TEMPERATURE - ONE HEATERS,HIGH TEMPERATURE

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

* PIPE RELIEF VALVE TO OPEN DRAIN.

NOTE 1:

TOGGLE SWITCH CONTROLS 180°F (82°C) NOTE 2: INSTALL LINE TEMPERATURE CONTROL
WATER CIRCULATION. INSTALL ON OR CLOSE	IN AN UNINSULATED TEE BEYOND THE
TO DISHWASHING MACHINE. TOGGLE SWITCH	DISHWASHING MACHINE TAKEOFF IN

INSTALL IN ACCORDANCE WITH LOCAL CODES.

CIRCULATING RETURN LINE CONNECTIONS.

-TEMPERED WATER LOOP, IF USED, CONNECT TO POINT “R”.

-STORED TEMPERATURE WATER LOOP, IF USED, CONNECT TO COLD WATER INLET.

MUST BE CLOSED (ON) DURING THE RINSE	THE SANITIZING LOOP. CONTROL
OPERATION AND OPEN (OFF) WHEN	SHOULD BE SET AT 185°F (85°C).
DISHWASHER IS NOT OPERATING OR WHEN
ON LONG STANDBY.	NOTE 3: ADJUST PLUG COCK SO THE SANITIZING
	LOOP FLOW RATE DOES NOT CAUSE
	UNNECESSARY TURBULENCE IN THE TANK.

CAUTION: IF BUILDING COLD WATER SUPPLY HAS A BACKFLOW PREVENTER, CHECK VALVE OR WATER METER WITH CHECK VALVE. PROVISIONS FOR THERMAL EXPANSION OF WATER IN THE HOT WATER SYSTEM MUST BE PROVIDED.

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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