A.O. Smith 300A, 500A warranty Pipe Relief Valve to Open Drain

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TWO TEMPERATURE - TWO HEATERS (ONE PRE-HEATER/ONE BOOSTER HEATER)

WITH OR WITHOUT BUILDING RECIRCULATION

DANGER

TEMPERATURE SETTING SHOULD NOT EXCEED SAFE TEMPERATURE AT FIXTURES. SEE WATER TEMPERATURE CONTROL WARNING ON PAGE 3. IF HIGHER PREHEAT TEMPERATURES ARE NECESSARY TO OBTAIN ADEQUATE BOOSTER OUTPUT, ADD AN ANTI-SCALD VALVE FOR HOT WATER SUPPLIED TO FIXTURES

*PIPE RELIEF VALVE TO OPEN DRAIN

**140°F (60°C)TO 150°F (66°C) SHOULD BE MAXIMUM WATER

TEMPERATURE MAINTAINED IN THE PRE-HEATERS.

120°F (49°C) SHOULD BE THE MINIMUM TEMPERATURE OF WATER IN THE PRE-HEATERS.

CONNECT CIRCULATING LINE FROM FIXTURES, IF USED, TO COLD WATER SUPPLY LINE OF PRE-HEATER.

CONNECT CIRCULATING LINE OF 180°F (82°C) OR BOOSTED WATER, IF USED, TO INLET WATER LINE TO BOOSTER.

INSTALL IN ACCORDANCE WITH LOCAL CODES.

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Contents Cyclone Xi Model BTH 300A, 400A, 500A Foreword ROUGH-IN-DIMENSIONSFeatures Table of ContentsHorizontal Sidewall Venting Vertical Rooftop Venting Quick Installation TipsWater Temperature Setpoint Adjustment Procedure High Limit Switch E.C.ODishwashing Machine Requirement Circulating Pump Installation InstructionsRequired Ability Insulation BlanketsHard Water ClearancesAIR Requirements Unconfined SpaceVenting Installation of Carbon Monoxide DetectorsCanadian Direct Vent US Horizontal Vent Direct Vent Terminal Installation Vent Pipe TerminationDirect Venting Vertical Vent Terminal Installation Installation SequenceVent Length Table Installation of Vent SystemControls and Switches GAS Piping HOT Surface IgniterConnection of GAS Pipe System Connections Water Potable Heating and Space Heating Heater WiringBTH 300 Wiring Diagram BTH 400 and 500 Wiring Diagram Electronic Control OperationSequence of Operation OverviewAdjusting the Operating Set Point Fault and Warning Conditions Changing the Display UnitsExample of a Warning Access to the Current Fault or Warning Example of a Fault Advanced Diagnostics InformationViewing Information About the Heater Viewing the Fault HistoryPrior to Start UP Required Ability Operating InstructionsOperating Instructions General Information MaintenanceDraining FlushingSediment Removal Lime Scale RemovalPowered Anode System Drain Valve and Access PanelsVent System U T I O N if Building Installation DiagramsPage Must be Identical Heaters Pipe Relief Valve to Open Drain Page Multiple Unit Installations Troubleshooting Motor RUNS, Burner Lights Momentarily Then Locks OUT Motor will not RUNReplacement Parts Noisy Burner OperationGAS Fails to Shut OFF Model BTH Limited Warranty
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