A.O. Smith BTH 120 - 250

A.O. SMITH WATER PRODUCTS CO., INC.

5621 W. 115TH STREET  ALSIP, ILLINOIS 60803

PHONE: 1-800-433-2545  FAX: 1-800-433-2515

WWW.HOTWATER.COM  E-MAIL: PARTS@HOTWATER.COM

Contents

Main CYCLONE XHE Model BTH 120 - 250 INSTALLATION OPERATION SERVICE MAINTENANCE LIMITED WARRANTY COMMERCIAL GAS WATER HEATER GAS-FIRED POWER BURNER FOR DOMESTIC HOT WATER Table 1. RECOVERY CAPACITIES - NATURAL GAS / L.P. ROUGH-IN -DIMENSIONS CYCLONE XHE BTH 120 - 250 Recovery capacities are based on heater performance at 94% thermal efficiency. TABLE OF CONTENTS FOREWORD HIGH LIMIT SWITCH (E.C.O.) FEATURES WATER TEMPERATURE CONTROL DANGER DISHWASHING MACHINE REQUIREMENT CIRCULATING PUMP INSTALLATION INSTRUCTIONS REQUIRED ABILITY INSULATION BLANKETS WARNING UNCONFINED SPACE CONFINED SPACE CHEMICAL VAPOR CORROSION WARNING VENTING WARNING Page Page INSTALLATION SEQUENCE CAUTION INSTALLATION OF VENT SYSTEM WARNING VERTICAL VENT TERMINAL INST ALLATION INSTALLATION SEQUENCE CONTROLS AND SWITCHES BLOWER PROVER SWITCH Table 2. VENT LENGTH TABLE VENT PIPE PREPARATION BLOCKED OUTLET PROVER SWITCH BLOCKED INLET PROVER SWITCH LOW GAS PRESSURE SWITCH GAS PIPING CAUTION WARNING CONNECTION OF GAS PIPE PURGING SYSTEM CONNECTIONS THERMOMETERS (Not Supplied) RELIEF VALVE WARNING HEATER WIRING WATER LINE CONNECTIONS CLOSED SYSTEM CAUTION OPERATION SEQUENCE OF OPERATION SELF DIAGNOSTIC CONTROLLER GAS VALVE LED FLASHING Possible Cause Remedy ERROR CODES FAULT CONDITIONS Page ADJUSTMENT PROCEDURE INITIAL START-UP PRIOR TO START UP REQUIRED ABILITY OPERATING INSTRUCTIONS Page CATHODIC PROTECTION PRECAUTIONS GENERAL INFORMATION POWER BURNER HIGH LIMIT HIGH ALTITUDE INSTALLATIONS WARNING MAINTENANCE ANODE INSPECTION AND REPLACEMENT FLUSHING DRAINING SEDIMENT REMOVAL LIME SCALE REMOVAL DRAIN VALVE AND ACCESS PANELS RELIEF VALVE CAUTION CIRCULATING PUMP VENT SYSTEM INSTALLATION DIAGRAMS * TWO TEMPERATURE - ONE HEATER HIGH TEMPERATURE WITH OR WITHOUT BUILDING RECIRCULATION DANGER Page Page TWO TEMPERATURE - ONE HEATER HIGH TEMPERATURE WITH RECIRCULATION OF SANITIZING LOOP Page CHECKLIST AND SERVICE INFORMATION WARNING BURNER OPERATIONAL PROBLEMS NOT ENOUGH OR NO HOT WATER WATER IS TOO HOT MOTOR WILL NOT RUN MOTOR RUNS, PREPURGE TIME ELAPSES BUT MAIN FLAME NOT ESTABLISHED. MOTOR RUNS, BURNER LIGHTS MOMENTARILY, THEN LOCKS OUT CAUTION NOISY BURNER OPERATION Model BTH Limited Warranty