A.O. Smith BTN 120 THRU 400/A Series Circulation With Or Without Building Recirculation, Danger

Page 18

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
	HORIZONTAL STORAGE 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.

*PIPE RELIEF VALVE TO OPEN DRAIN

INSTALL IN ACCORDANCE WITH LOCAL CODES.

DANGER

TEMPERATURE SETTING SHOULD NOT EXCEED SAFE

USE TEMPERATURE AT FIXTURES. SEE WATER

TEMPERATURE CONTROL WARNING ON PAGE 25. IF

HIGHER PREHEAT TEMPERATURESARE NECESSARYTO

OBTAIN ADEQUATE BOOSTER OUTPUT, ADD AN ANTI-

SCALD VALVE FOR HOT WATER SUPPLIED TO FIXTURES.

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Contents INSTALLATION OPERATION MAINTENANCE LIMITED WARRANTY MODELS BTN 120 THRU 400/A SeriesCOMMERCIAL GAS, GLASS-LINED, TANK-TYPE WATER HEATER TABLE 3. GASAND ELECTRICAL CHARACTERISTICS ROUGH-IN-DIMENSIONSTABLE 1. ROUGH-IN-DIMENSIONS FRONT VIEWTABLE OF CONTENTS FOREWORDGROUNDING INSTRUCTIONS GENERAL SAFETY INFORMATIONPRECAUTIONS CHEMICAL VAPOR CORROSIONHIGH LIMIT SWITCH FEATURESHIGH ALTITUDE INSTALLATIONS ELECTRONIC IGNITION CONTROLUNCRATING CIRCULATING PUMPDISHWASHING MACHINE REQUIREMENT LOCATING THE HEATERHARD WATER LEVELINGCLEARANCES AIR REQUIREMENTSUNCONFINED SPACE VENTINGMULTIPLE HEATER MANIFOLD CONFINED SPACETABLE 6. TECHNICAL DATA VENTING TYPE B GAS VENT Multiple Gas Fired Tank-Type HeatersTABLE 6. TECHNICAL DATA VENTING Continued THERMOMETERS Not Supplied WATER LINE CONNECTIONSWATER POTABLE HEATING AND SPACE HEATING See pages RELIEF VALVECODE RESTRICTIONS INSTALLATION DIAGRAMS-TOP INLET/OUTLET USAGEGENERAL DANGERTEMPERATURE SETTING SHOULD NOT EXCEED SAFE USE VERTICAL STORAGE TANK AND FORCED CIRCULATIONHORIZONTAL STORAGE TANK AND FORCED CIRCULATION TEMPERATURE AT FIXTURES. SEE WATER TEMPERATURE CONTROLTWO TEMPERATURE - ONE HEATER HIGH TEMPERATURE STORAGE WITH RECIRCULATION OF SANITIZING LOOPINSTALLATION DIAGRAMS-SIDE INLET/OUTLET USAGE TWO TEMPERATURE - TWO HEATERS, ONE PRE-HEATER/ONE - BOOSTER HEATERWITH OR WITHOUT BUILDING RECIRCULATION HEATER WITH OR WITHOUT MIXING VALVE ONE OR TWO TEMPERATURE - ONE HEATERS,HIGH TEMPERATURESTORAGE WITH OR WITHOUT RECIRCULATION HEATER WITH MIXING VALVE AND RECIRCULATED SANITIZING LOOPTWO PRE-HEATERS WITH MIXING VALVE TWO TEMPERATURE - TWO PRE-HEATERS WITH MIXING VALVE OR BOOSTERHEATER WITH OR WITHOUT BUILING RECIRCULATION TWO PRE-HEATERS WITH BOOSTER HEATERVERTICAL STORAGE TANK MEDIUM TEMPERATURE - ONE HEATER WITH AUXILIARY STORAGE TANK FORCEDCIRCULATION WITH OR WITHOUT BUILDING RECIRCULATION HORIZONTAL STORAGE TANKTHREE UNIT MANIFOLD KIT MANIFOLD KITSTWO UNIT MANIFOLD KIT FOUR UNIT MANIFOLD KITHEATER WIRING FIGURE 9 - SINGLE UNIT WIRING DIAGRAM BTN-120 THROUGH 400ATABLE 7 - GAS SUPPLY LINE SIZES IN INCHES MAXIMUM CAPACITY OF PIPE IN GAS PIPINGGAS PRESSURE REGULATOR CUBIC FEET PER HOURAPPROXIMATE TIME REQUIRED TO CONSUME OPERATIONMANIFOLD GAS PRESSURE IN INCHES OF WATER COLUMN ALL MODELS 1 CU. FT. OF GAS AT FULL CAPACITYSEQUENCE OF OPERATION FOR YOUR SAFETY READ BEFORE OPERATING LIGHTING AND OPERATION INSTRUCTIONSOPERATING INSTRUCTIONS IGNITOR ASSEMBLY PREVENTIVE MAINTENANCECHECK THE IGNITOR ASSEMBLY WATER TEMPERATURE CONTROLCHECKING THE INPUT MAIN BURNERGAS VALVES FIGURE 11, IGNITORHOT WATER ODOR VENTING SYSTEMREMOTE STORAGE TANK TEMPERATURE CONTROL ANODE ROD INSPECTIONDELIMING SOLVENTS RECOMMENDED PROCEDURE FORTANK CLEANOUT PROCEDURE DELIMING USING FLO-JUG METHODIGNITION MODULE SYSTEM SERVICESYSTEM DIAGNOSTICS ELECTRICAL SERVICINGREPLACEMENT PARTS, SERVICE HANDBOOKS AND TRAINING AIDS SEQUENCE OF OPERATION FLOW CHARTREPLACEMENT PARTS REMEDY OPERATIONAL CHECKLISTSERVICEMAN COMPLAINT6. CLAIMPROCEDURE Model BTN Limited Warranty4. SERVICEANDREPAIREXPENSES KEEPTHISWARRANTYPOSTEDADJACENTTOTHEHEATERFORFUTUREREFERENCE