A.O. Smith BTH 300A, BTH 400A warranty Powered Anode System, Powered Anode Operation, Vent System

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2.Remove outer cover plate from lower side of heater jacket.

3.Remove cover from cleanout opening.

4.Remove lime, scale or sediment using care not to damage the glass-lining.

5.Inspect cleanout plate gasket: If new gasket is required, replace with A. O. Smith part no. 99038.

6.Install cleanout plate. Be sure to draw plate up tight by tightening screws securely.

7.Close drain valve, open water inlet line and turn on the power burner electrical disconnect switch.

8.Check for water leakage.

9.Replace outer jacket cover plate.

POWERED ANODE SYSTEM

The BTH-300 & 400 are factory equipped with a powered anode system. The anodes are of a permanent design and do not need replacing unless damaged.

POWERED ANODE OPERATION

To insure a long, trouble-free operating life, the BTH-300 & 400 are equipped with a powered anode system consisting of:

1.A power supply with a built-in diagnostic LED.

2.Two titanium anodes.

3.Wiring harness with ground lead.

Replacement parts for this system may be ordered from A.O. Smith Product Service Division; see BTH-300 & 400 parts list for specific details.

FIGURE 25.

POWER SUPPLY LED MEANINGS:

The power supply diagnostic LED is located in the bottom right- hand corner of the BTH-300 & 400 control board.

Steady green light means powered anode system is functioning normally.

No light means no line voltage or a defective power supply.

Flashing red light can mean (1) the heater has no water or

(2) a broken or loose connection has occurred.

DRAIN VALVE AND ACCESS PANELS

The heaters are equipped with a 3/4" drain valve.

An access panel covers the cleanout opening in the tank which is sealed by a gasket and cover, see Figure 24.

RELIEF VALVE

At least twice a year, the temperature and pressure relief valve should be checked to ensure that it is in operating condition. To check the relief valve, lift the lever at the end of the valve several times. The valve should seat properly and operate freely.

If water does not flow, remove and inspect for obstructions or corrosion. Replace with a new valve of the recommended size as necessary. Inspection of the valve should be performed at least every three years. Do not attempt to repair the valve, as this could result in improper operation and a tank explosion. In areas with poor water conditions, it may be necessary to inspect the T&P valve more often than every three years.

CAUTION

BEFORE MANUALLY OPERATING THE VALVE, MAKE SURE THAT A DRAIN LINE HAS BEEN ATTACHED TO THE VALVE TO DIRECT THE DISCHARGE TO AN OPEN DRAIN. FAILURE TO TAKE THIS PRECAUTION COULD MEAN CONTACT WITH EXTREMELY HOT WATER PASSING OUT THE VALVE DURING THIS CHECKING OPERATION.

If the temperature and pressure relief valve on the heater discharges periodically or continuously, it may be due to thermal expansion of water in a closed water supply system, or, it may be due to a faulty relief valve.

Thermal expansion is the normal response of water when it is heated. In a closed system, thermal expansion will cause the system pressure to build until the relief valve actuation pressure is equaled. Then, the relief valve will open, allowing some water to escape, slightly lowering the pressure.

Contact your water supplier or local plumbing inspector on how to control this situation.

Two common corrections are listed in the Checklist and Service Information which appears later in this manual.

ABOVE ALL, DO NOT PLUG THE TEMPERATURE AND PRESSURE RELIEF VALVE. THIS IS NOT A SOLUTION AND CAN CREATE A HAZARDOUS SITUATION.

VENT SYSTEM

Examine the vent system every 3 months. Points of inspection are as follows:

1.Check for obstructions and/or deterioration of vent piping and vent hood. Replace immediately where needed.

2.Vent pipe and vent hood screen should be cleaned of foreign material and soot. The screen is located inside the vent hood outlet and is accessible from the outside of the hood. Do not reach inside the vent hood when the heater is in operation.

3.Check all vent system connections for leakage and reseal as required using Hi Temp Silicone sealer or equivalent.

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Contents Cyclone XHE Model BTH 300A and 400A Foreword ROUGH-IN-DIMENSIONSGAS Valve Piping Features Table of ContentsHorizontal Sidewall Venting Vertical Rooftop Venting Quick Installation TipsHigh Limit Switch E.C.O Water Temperature Setpoint Adjustment ProcedureDishwashing Machine Requirement Circulating Pump Installation InstructionsRequired Ability Insulation BlanketsHard Water ClearancesUnconfined Space Confined SpaceCanadian Direct Vent US Direct VentCanadian Horizontal Vent US Horizontal VentVent Pipe Termination Direct Vent Terminal InstallationDirect Venting Vertical Vent Terminal Installation Installation SequenceVent Length Table Installation of Vent SystemBlower Prover Switch Controls and SwitchesBlocked Outlet Prover Switch Blocked Inlet Prover SwitchGAS Piping HOT Surface IgniterConnection of GAS Pipe System Connections Heater Wiring Page Operation Self Diagnostic ControllerSequence of Operation GAS Valve LED FlashingFault Conditions Error CodesECO Switch OPEN. See Figure Operating Instructions Adjustment Procedure Initial START-UPPrior to Start UP Required Ability What to do if YOU Smell GAS Operating InstructionsGeneral Information Flushing Maintenance ScheduleDraining Sediment RemovalPowered Anode Operation Powered Anode SystemPower Supply LED Meanings Drain Valve and Access PanelsInstallation Diagrams Install in Accordance with Local Codes Must be Identical Heaters Install in Accordance with Local Codes Page Manifold Kits Not Enough or no HOT Water Burner Operational ProblemsWater is TOO HOT Water Heater Makes SoundsMotor RUNS, Burner Lights Momentarily Then Locks OUT Motor will not RUNNoisy Burner Operation Replacement PartsGAS Fails to Shut OFF Model BTH Limited Warranty

BTH 300A, BTH 400A specifications

A.O. Smith has established itself as a leader in the water heating industry, offering a range of products that combine efficiency, reliability, and innovative technology. Among these products, the BTH 300A and BTH 400A models stand out for their advanced features and robust performance, catering to both residential and commercial needs.

The BTH 300A and BTH 400A are high-efficiency water heaters designed with cutting-edge condensing technology, allowing for significant energy savings compared to traditional water heating systems. These models utilize a modulating gas valve that adjusts the burner operation based on the demand for hot water. This smart system not only enhances efficiency but also ensures a consistent supply of hot water without the worry of fluctuations.

One of the standout features of the BTH series is its compact design. Both the BTH 300A and BTH 400A are engineered to fit into smaller spaces, making them ideal for properties with limited installation areas. Their lightweight construction and user-friendly installation features further simplify the process, ensuring that homeowners and professionals alike can set them up with ease.

The BTH models are equipped with advanced control systems that offer precise temperature adjustment capabilities. Users can easily customize their hot water settings to meet specific household or business requirements. This adaptability is supported by the built-in digital display, which provides real-time information about the operating status of the unit.

Safety is a key consideration in the design of the BTH 300A and BTH 400A. They feature a robust set of safety mechanisms, including temperature lockout and venting safeguards, ensuring reliable operation and peace of mind for users. A.O. Smith also understands the importance of longevity in water heaters, and these models are built with high-quality materials, making them resistant to corrosion and wear over time.

In terms of performance, both the BTH 300A and BTH 400A models deliver exceptional heating capabilities, capable of meeting high demands while maintaining efficiency. With customer satisfaction at the forefront, A.O. Smith backs these units with an extensive warranty, demonstrating their commitment to quality and long-term performance.

In summary, the A.O. Smith BTH 300A and BTH 400A water heaters exemplify the marriage of innovation and functionality. With their energy-efficient operation, customizable settings, compact design, and advanced safety features, these models are a compelling choice for those in need of reliable and effective hot water solutions.
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