A.O. Smith BTH 300A, BTH 400A warranty General Information

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WARNING

UNDER NO CIRCUMSTANCES SHOULD THE INPUT EXCEED THE RATE SHOWN ON THE HEATER RATING PLATE. OVERFIRING COULD RESULT IN DAMAGE OR SOOTING OF THE HEATER.

CATHODIC PROTECTION

CAUTION

HYDROGEN GAS CAN BE PRODUCED IN A HOT WATER SYSTEM SERVED BY THIS HEATER THAT HAS NOT BEEN USED FOR A LONG PERIOD OF TIME (GENERALLY TWO WEEKS OR MORE). HYDROGEN GAS IS EXTREMELY FLAMMABLE. To reduce the risk of injury under these conditions, it is recommended that a hot water faucet be opened for several minutes before using any electrical appliance connected to the hot water system. If hydrogen is present, there will probably be an unusual sound such as air escaping through the pipe as the water begins to flow. There should be no smoking or open flame near the faucet at the time it is open.

PRECAUTIONS

IF THE UNIT IS EXPOSED TO OR EXHIBITS THE FOLLOWING, DO NOT OPERATE HEATER UNTIL ALL CORRECTIVE STEPS HAVE BEEN MADE BY A QUALIFIED SERVICEMAN.

1.FLOODING TO OR ABOVE THE LEVEL OF THE BURNER OR CONTROLS

2.EXTERNAL DAMAGE

3.FIRING WITHOUT WATER

4.SOOTING

NEVER OPERATE THE HEATER WITHOUT FIRST BEING CERTAIN IT IS FILLED WITH WATER AND A TEMPERATURE AND PRESSURE RELIEF VALVE IS INSTALLED IN THE RELIEF VALVE OPENING OF THE HEATER.

SHOULD OVERHEATING OCCUR OR THE GAS SUPPLY FAIL TO SHUT OFF, TURN OFF THE MANUAL GAS CONTROL VALVE TO THE APPLIANCE.

GENERAL INFORMATION

POWER BURNER

The initial start-up procedure of the unit is provided on page 19. The sequence of operation of the unit is provided on page 16.

It is important to note that the controller has a reset button on the control box, Figure 1. The reset button is a safety device and would not normally be used.

HIGH LIMIT

The high limit (not adjustable) is factory set to cutout at 202°F (94°C). The controller must be manually reset by depressing the reset button on front of the control when water temperature drops to below 160°F (71°C).

TABLE 4.

GAS SUPPLY SPECIFICATIONS

Nat. Gas

LP Gas

Max. Gas Supply Pressure W.C.

11.00

14.00

Max. Gas Supply Pressure kPa

2.74

3.49

Nominal Gas Supply Pressure W.C.

7.00

11.00

Nominal Gas Supply Pressure kPa

1.74

2.74

Minimum Gas Supply Pressure W.C.*

5.20

11.0

Minimum Gas Supply Pressure kPa*

1.54

2.74

Manifold Gas Supply Pressure W.C.

4.00

10.0

Manifold Gas Supply Pressure kPa

1.25

2.49

* Minimum pressure for purposes of rate adjustment

HIGH ALTITUDE INSTALLATIONS

WARNING

BTH HEATERS ARE CERTIFIED FOR USE WITHOUT MODIFICATION FOR ALTITUDES UP TO 2000 FEET. INSTALLATIONS ABOVE 2000 FEET MAY REQUIRE REPLACEMENT OF THE BURNER ORIFICE. CALL THE TECHNICAL INFORMATION CENTER AT (800) 527-1953 FOR REQUIREMENTS.

HIGH ALTITUDE ADJUSTMENTS

FOR BTH 300 AND 400

NATURAL GAS

ELEVATION (ft./m)

MANIFOLD SETTING (in W.C./Kpa)

Up to 2,000 ft./610 m.

4.0/1.25 - NO ADJUSTMENT

2,001

- 3,000 ft./914 m.

3.8/0.946

3,001

- 4,000 ft./1,219 m.

3.7/0.921

4,001

- 5,000 ft./1,524 m.

3.7/0.921

5,001

- 6,000 ft./1,829 m.

3.6/0.896

6,001

- 7,000 ft./2,134 m.

3.6/0.896

7,001

- 8,000 ft./2,438 m.

3.5/0.871

PROPANE GAS

ELEVATION (ft./m)

MANIFOLD SETTING (in W.C./Kpa)

Up to 2,000 ft./610 m.

10.0/2.49 - NO ADJUSTMENT

2,001

- 3,000 ft./914 m.

9.9/2.46

3,001

- 4,000 ft./1,219 m.

9.8/2.44

4,001

- 5,000 ft./1,524 m.

9.7/2.41

5,001

- 6,000 ft./1,829 m.

8.4/2.09

6,001

- 7,000 ft./2,134 m.

7.2/1.79

7,001

- 8,000 ft./2,438 m.

6.1/1.52

Some gas utility companies derate their gas for altitude, making it unnecessary to install high altitude orifices. Call the local gas or utility company to verify BTU content.

Due to the input rating reduction at high altitudes, the output rating of the appliance is also reduced and should be compensated for in the sizing of the equipment for applications.

MAINTENANCE

GENERAL

KEEP APPLIANCE AREA CLEAR AND FREE FROM COMBUSTIBLE MATERIALS, GASOLINE AND OTHER FLAMMABLE VAPORS AND LIQUIDS. (SEE WARNING ON PAGE 5, LOCATING THE HEATER).

Water heater maintenance includes periodic tank flushing and cleaning, and removal of lime scale. The unit should be inspected and adjusted to maintain proper combustion. Refer to the following table. A periodic inspection of the venting system should be made. Where used, the water circulating pump should be oiled.

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Contents Cyclone XHE Model BTH 300A and 400A GAS Valve Piping ROUGH-IN-DIMENSIONSForeword Features Table of ContentsHorizontal Sidewall Venting Vertical Rooftop Venting Quick Installation TipsDishwashing Machine Requirement Water Temperature Setpoint Adjustment ProcedureHigh Limit Switch E.C.O Insulation Blankets Installation InstructionsCirculating Pump Required AbilityConfined Space ClearancesHard Water Unconfined SpaceCanadian Direct Vent US Direct VentCanadian Horizontal Vent US Horizontal VentDirect Venting Direct Vent Terminal InstallationVent Pipe Termination Vertical Vent Terminal Installation Installation SequenceVent Length Table Installation of Vent SystemBlocked Inlet Prover Switch Controls and SwitchesBlower Prover Switch Blocked Outlet Prover SwitchConnection of GAS Pipe HOT Surface IgniterGAS Piping System Connections Heater Wiring Page GAS Valve LED Flashing Self Diagnostic ControllerOperation Sequence of OperationFault Conditions Error CodesECO Switch OPEN. See Figure Prior to Start UP Required Ability Adjustment Procedure Initial START-UPOperating Instructions What to do if YOU Smell GAS Operating InstructionsGeneral Information Sediment Removal Maintenance ScheduleFlushing DrainingDrain Valve and Access Panels Powered Anode SystemPowered Anode Operation Power Supply LED MeaningsInstallation Diagrams Install in Accordance with Local Codes Must be Identical Heaters Install in Accordance with Local Codes Page Manifold Kits Water Heater Makes Sounds Burner Operational ProblemsNot Enough or no HOT Water Water is TOO HOTMotor RUNS, Burner Lights Momentarily Then Locks OUT Motor will not RUNGAS 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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