A.O. Smith 300A, 500A

FIGURE 15.

BTH 300 WIRING DIAGRAM

Contents

Main CYCLONE Xi Model BTH 300A, 400A, 500A COMMERCIAL GAS WATER HEATER GAS-FIRED POWER BURNER FOR DOMESTIC HOT WATER FOREWORD ROUGH-IN-DIMENSIONS GAS VALVE PIPING BTH-300 1 1/4" NPT BTH-400 1 1/4" NPT BTH-500 1 1/2" NPT FEATURES TABLE OF CONTENTS WATER TEMPERATURE CONTROL Page WATER TEMPERATURE SETPOINT ADJUSTMENT PROCEDURE HIGH LIMIT SWITCH (E.C.O.) DISHWASHING MACHINE REQUIREMENT CIRCULATING PUMP INSTALLATION INSTRUCTIONS REQUIRED ABILITY INSULATION BLANKETS LOCATING THE HEATER CLEARANCES HARD WATER AIR REQUIREMENTS MECHANICAL EXHAUSTING OF ROOM AIR UNCONFINED SPACE VENTING Page Page VENT PIPE TERMINATION DIRECT VENTING DIRECT VENT TERMINAL INSTALLATION INSTALLATION SEQUENCE VERTICAL VENT TERMINAL INSTALLATION INSTALLATION SEQUENCE INSTALLATION OF VENT SYSTEM WARNING VENT PIPE PREPARATION CONTROLS AND SWITCHES BLOWER PROVER SWITCH BLOCKED OUTLET PROVER SWITCH BLOCKED INLET PROVER SWITCH LOW GAS PRESSURE SWITCH GAS PIPING CONNECTION OF GAS PIPE PURGING GAS METER SIZE - CITY GASES ONLY GAS VALVES SYSTEM CONNECTIONS THERMOMETERS (Not Supplied) RELIEF VALVE WATER LINE CONNECTIONS CLOSED SYSTEM WATER (POTABLE) HEATING AND SPACE HEATING HEATER WIRING Page Page OPERATION SEQUENCE OF OPERATION ELECTRONIC CONTROL Page Page Page Page ADJUSTMENT PROCEDURE - INITIAL START-UP PRIOR TO START UP - REQUIRED ABILITY OPERATING INSTRUCTIONS LIGHTING AND OPERATION INSTRUCTIONS FOR YOUR SAFETY READ BEFORE OPERATING OPERATING INSTRUCTIONS WARNING CATHODIC PROTECTION PRECAUTIONS GENERAL INFORMATION POWER BURNER HIGH LIMIT HIGH ALTITUDE INSTALLATIONS MAINTENANCE FLUSHING DRAINING SEDIMENT REMOVAL LIME SCALE REMOVAL POWERED ANODE SYSTEM DRAIN VALVE AND ACCESS PANELS RELIEF VALVE 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 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 NOISY BURNER OPERATION GAS FAILS TO SHUT OFF REPLACEMENT PARTS Model BTH Limited Warranty