A.O. Smith 400A, BTH 300A

Horizontal Sidewall Venting Vertical Rooftop Venting

“AT A GLANCE” BTH 300/400

QUICK INSTALLATION TIPS

Contents

Main CYCLONE XHE Series 970 Model BTH 300A AND 400A COMMERCIAL GAS W A TER HEA TER FOREWORD ROUGH-IN-DIMENSIONS GAS VALVE PIPING BTH-300 1 1/4" NPT BTH-400 1 1/4" NPT WATER TEMPERA TURE CONTROL TABLE OF CONTENTS FEATURES 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 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 HOT SURFACE IGNITER GAS PIPING CONNECTION OF GAS PIPE PURGING CAUTION SYSTEM CONNECTIONS THERMOMETERS (Not Supplied) RELIEF VALVE WARNING WATER LINE CONNECTIONS WHC1202 INTEGRATED WATER HEATER CONTROL CONNECTION DIAGRAM OPERATION SEQUENCE OF OPERATION Possible Cause Remedy SELF DIAGNOSTIC CONTROLLER GAS VALVE LED FLASHING ERROR CODES FAULT CONDITIONS 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 WARNING SEDIMENT REMOVAL LIME SCALE REMOVAL MAINTENANCE SCHEDULE FLUSHING DRAINING POWERED ANODE SYSTEM POWERED ANODE OPERATION POWER SUPPLY LED MEANINGS: DRAIN VALVE AND ACCESS P ANELS RELIEF VALVE INTERNAL CIRCULATING PUMP VENT SYSTEM * * INSTALLATION DIAGRAMS ONE TEMPERATURE - ONE HEATER VERTICAL STORAGE TANK FORCED CIRCULATION * TWO TEMPERATURE - ONE HEATER HIGH TEMPERATURE DANGER Page TWO TEMPERATURE - TWO HEATERS (ONE PRE-HEATER/ONE BOOSTER HEATER) DANGER 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 Model BTH Limited Warranty