A.O. Smith BTH 300A, BTH 400A warranty Burner Operational Problems, Not Enough or no HOT Water

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CHECKLIST AND SERVICE INFORMATION

IMPORTANT

The installer may be able to observe and correct certain problems which might arise when the unit is put into operation or when it is re- fired after a prolonged shutdown. HOWEVER, it is recommended that only qualified servicemen, using appropriate test equipment, be allowed to service the heater.

BE SURE TO TURN OFF THE ELECTRICITY WHENEVER POSSIBLE OR APPROPRIATE WHILE CHECKING EQUIPMENT.

WARNING

FAILURE TO FOLLOW THESE INSTRUCTIONS CAN RESULT IN SERIOUS PERSONAL INJURY OR DEATH.

CAUTION:

LABEL ALL WIRES PRIOR TO DISCONNECTION WHEN SERVICING CONTROLS. WIRING ERRORS CAN CAUSE IMPROPER AND DANGEROUS OPERATION.

VERIFY PROPER OPERATION AFTER SERVICING.

BURNER OPERATIONAL PROBLEMS

1. Refer to TROUBLESHOOTING.

NOT ENOUGH OR NO HOT WATER

1.Be certain the electrical disconnect switch serving the water heater is in the ON position.

2.Check the fuses.

•The electrical disconnect switch usually contains fuses.

3.The capacity of the heater may have been exceeded by a large demand for hot water.

•Large demands require a recovery period to restore water temperature.

4.Colder incoming water temperature will lengthen the time required to heat water to the desired temperature.

•If the heater was installed when incoming water temperature was warm, colder water creates the effect of less hot water.

5.Look for hot water wastage and leaking or open hot water faucets.

6.Sediment or lime scale may be affecting water heater operation. Refer to MAINTENANCE for details.

7.The heater’s temperature high limit sensor has activated. Press the reset button on the thermostat.

8.Burner may not be firing at proper rate.

•Check gas pressure. Adjust to obtain required manifold pressure.

9.Burner fan wheel may be dirty.

•Clean fan wheel with a stiff brush.

10.Condensate hose may be blocked where it connects to the exhaust elbow.

• Verify the condensate drains from the unit without restriction.

WATER IS TOO HOT

1. Refer to WATER TEMPERATURE CONTROL.

WATER HEATER MAKES SOUNDS

1.Sediment or lime scale accumulations cause rumbling and pounding noises when the heater is operating.

•The sounds are normal, however, the tank bottom should be cleaned. Refer to MAINTENANCE for details.

2.Some of the electrical components of the water heater make sounds which are normal.

•Contacts click or snap as the heater starts and stops.

•Transformers often hum.

WATER LEAKAGE IS SUSPECTED

1.Check to see if the water heater drain valve is tightly closed. Also check the cleanout opening for leakage.

2.The apparent leakage may be condensation which forms on cool surfaces of the heater and piping.

3.If the outlet of the relief valve is leaking it may represent:

•Excessive water pressure.

•Excessive water temperature.

•Faulty relief valve.

Excessive water pressure is the most common cause of relief valve leakage. It is often caused by a “closed system”. If a check valve is in the inlet system it will not permit the expanded hot water volume to equalize pressure with the main. The relief valve must release this water or the water heater or plumbing system will be damaged. Refer to MAINTENANCE-RELIEF VALVE section in this manual.

When such a condition is encountered, local codes or inspection agency should be consulted to determine which system is acceptable in your area. See CLOSED SYSTEM section in this manual.

TROUBLESHOOTING

1.Verify that the allowable vent length has not been exceeded and that the blower inlet screen has been removed if direct venting.

2.Verify the gas supply volume and pressure per table 3 and 4.

3.Verify that the condensation, which WILL be present in the heater and exhaust vent, will drain.

4.Check supply wire polarity - hot to hot and neutral to neutral and no "stray" current in neutral.

5.Heater is properly grounded.

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Contents Cyclone XHE Model BTH 300A and 400A GAS Valve Piping ROUGH-IN-DIMENSIONSForeword Table of Contents FeaturesQuick Installation Tips Horizontal Sidewall Venting Vertical Rooftop VentingDishwashing Machine Requirement Water Temperature Setpoint Adjustment ProcedureHigh Limit Switch E.C.O Installation Instructions Circulating PumpRequired Ability Insulation BlanketsClearances Hard WaterUnconfined Space Confined SpaceUS Direct Vent Canadian Direct VentUS Horizontal Vent Canadian Horizontal VentDirect Venting Direct Vent Terminal InstallationVent Pipe Termination Installation Sequence Vertical Vent Terminal InstallationInstallation of Vent System Vent Length TableControls and Switches Blower Prover SwitchBlocked Outlet Prover Switch Blocked Inlet Prover SwitchConnection of GAS Pipe HOT Surface IgniterGAS Piping System Connections Heater Wiring Page Self Diagnostic Controller OperationSequence of Operation GAS Valve LED FlashingError Codes Fault ConditionsECO Switch OPEN. See Figure Prior to Start UP Required Ability Adjustment Procedure Initial START-UPOperating Instructions Operating Instructions What to do if YOU Smell GASGeneral Information Maintenance Schedule FlushingDraining Sediment RemovalPowered Anode System Powered Anode OperationPower 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 Burner Operational Problems Not Enough or no HOT WaterWater is TOO HOT Water Heater Makes SoundsMotor will not RUN Motor RUNS, Burner Lights Momentarily Then Locks OUTGAS Fails to Shut OFF Replacement PartsNoisy Burner Operation 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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