A.O. Smith BTX-80 SERIES 100 Thermal Expansion, Temperature-Pressure Relief Valve

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Thermal Expansion

As water is heated, it expands (thermal expansion). In a closed system the volume of water will grow when it is heated. As the volume of water grows there will be a corresponding increase in water pressure due to thermal expansion. Thermal expansion can cause premature tank failure (leakage). This type of failure is not covered under the limited warranty. Thermal expansion can also cause intermittent Temperature- Pressure Relief Valve operation: water discharged from valve due to excessive pressure build up. This condition is not covered under the limited warranty. The Temperature-Pressure Relief Valve is not intended for constant relief of thermal expansion.

A properly sized thermal expansion tank must be installed on all closed systems to control the harmful effects of thermal expansion. Contact a local plumbing service agency to have a thermal expansion tank installed.

NOTE: To protect against untimely corrosion of hot and cold water fittings, it is strongly recommended that di-electric unions or couplings be installed on this water heater when connected to copper pipe.

All gas piping must comply with local codes and ordinances or with the National Fuel Gas Code (ANSI Z223.1/ NFPA-54) or the Natural Gas and Propane Installation Code (CAN/CSA B149.1) whichever applies. Copper and brass tubing and fittings (except tin lined copper tubing) should not be used.

FIGURE 11.

Fit pipe insulation over the incoming cold water line and the hot water line. Make sure that the insulation is against the top cover of the heater. Fit T & P valve insulation over valve. Make sure that the insulation does not interfere with the lever of the T & P valve.

Secure all insulation using tape.

Temperature-Pressure Relief Valve

FIGURE 10.

Figure 10 shows typical attachment of water piping to the water heater. The water heater is equipped with 3/4 inch NPT water connections.

NOTE: If using copper tubing, solder tubing to an adapter before attaching the adapter to the water heater connections. Do not solder the water lines directly to the water heater connections. It will harm the dip tube and damage the tank.

T & P Valve and Pipe Insulation (if supplied)

Remove insulation for T & P valve and pipe connections from carton.

Explosion Hazard

Temperature-Pressure Relief Valve must comply with ANSI Z21.22- CSA 4.4 and ASME code.

Properly sized Temperature-Pressure Relief Valve must be installed in opening provided.

Can result in overheating and excessive tank pressure.

Can cause serious injury or death.

This water heater is provided with a properly rated/sized and certified combination Temperature-Pressure Relief Valve (T&P valve) by the manufacturer. The valve is certified by a nationally recognized testing laboratory that maintains periodic inspection of production of listed equipment of materials as meeting the requirements for Relief Valves for Hot Water Supply Systems, ANSI Z21.22 • CSA 4.4, and the code requirements of ASME.

If replaced, the new T&P valve must meet the requirements of local codes, but not less than a combination Temperature-Pressure Relief Valve rated/sized and certified as indicated in the above paragraph. The new valve must be marked with a maximum set pressure not to exceed the marked hydrostatic working pressure of the water heater (150 psi = 1,035 kPa) and a discharge capacity not less than the water heater Btu/hr or kW input rate as shown on the water heater’s model rating plate.

Note: In addition to the factory installed Temperature-Pressure Relief Valve on the water heater, each remote storage tank that may be installed and piped to a water heating appliance must also have its own properly sized, rated and approved Temperature-Pressure Relief Valve installed. Call the toll free technical support phone number listed on the back cover of this manual for technical assistance in sizing a Temperature-Pressure Relief Valve for remote storage tanks.

For safe operation of the water heater, the Temperature-Pressure Relief Valve must not be removed from its designated opening nor plugged. The Temperature-Pressure Relief Valve must be installed directly into the fitting of the water heater designed for the relief valve. Install discharge piping so that any discharge will exit the pipe within 6 inches (15.2 cm) above an adequate floor drain, or external to the building. In cold climates it is recommended that it be terminated at an adequate drain inside the building. Be certain that no contact is made with any live electrical part. The

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Contents Power Vented GAS Models W/HOT Surface Ignition Whenever maintenance adjustment or service is requiredPrinted 197086-004Approvals Safe INSTALLATION, USE and ServiceImportant Definitions General Safety Information General Safety Information Table of Contents IntroductionInstallation of Carbon Monoxide Detectors Approved Carbon Monoxide DetectorsSignage ExemptionsReplacement Parts and Deliming Products Typical InstallationElbow Access Door Condensate Hose and Drain PAN Mixing Valves ROUGH-IN-DIMENSIONS Rough-In-DimensionsCapacity and Gas and Electrical Characteristics Recovery capacity based on 90% thermal efficiencyLocating the NEW Water Heater Facts to Consider About the LocationInsulation Blankets Air REQUIREMENTsUnconfined Space Confined SpaceFresh Air Openings For Confined Spaces Outdoor Air Through Two OpeningsOutdoor AIR Through TWO Vertical Ducts Outdoor AIR Through TWO Horizontal DuctsAIR from Other Indoor Spaces Installing the NEW Water Heater Chemical Vapor CorrosionWater Piping Space Heating and Potable Water SystemThermal Expansion Temperature-Pressure Relief ValveValve and Pipe Insulation if supplied Contact qualified installer or service agency High Altitude InstallationGas Piping Filling the Water Heater Sediment TrapsPer square inch 3.5 kPa Vent Pipe Assembly VentingTermination Clearances Sidewall Power Vent Vent Pipe TerminationCondensate Planning the Vent SystemBreathing Hazard Carbon Monoxide Gas Installation of Vent System Blower Assembly InstallationVent Terminal INSTALLATION, Sidewall Power Vent Wiring Schematic Figure Chisel an opening approximately one half inch 1.3 cm largerThan the marked circle Pointed in the correct position, see FigureInstallation of Vent SYSTEM, Sidewall Installation of Vertical Vent SystemVent attenuation assembly Flexible tubing Instruction sheet Vent Attenuation Assembly InstallationVertical VAA Installations Recommended Inch vent Vertical VAA Installations Vent Pipe Preparation Recommended BRUSH* Size for Primer Cement ApplicationsStep B Step EStep F Step GPower Before Servicing Do not try to light the burner by handWhat to do if YOU Smell GAS Do not TRY to Light the Burner by HandTemperature Regulation Temperature Indicators Temperature Adjustment ButtonsDisplay D E FStart UP Conditions For Your InformationOperational Conditions Periodic Maintenance Anode ROD InspectionTemperature-Pressure Relief Valve Test Keep hands clear of drainTo Flush the Water Heater Storage Tank Open the water heater drain valve to flush the storage tankService Leakage CheckpointsTroubleshooting Guidelines Trouble ShootingEnsure the flame sensor is clean use ultra fine steel Turn off power to the water heaterAssembly if damaged or defective Unplug ignitor assembly plug from control. Check resistanceUnplug the ignitor assembly plug from the control. Check Resistance of the black resistor wire between pinsAssembly .2 If the reading taken is less than 100,000 Check vent temperature limit switch if it is determinedTroubleshooting Guidelines Service and Repair Expenses Claim ProcedureTank ALL Other Parts

BTX-80 SERIES 100 specifications

The A.O. Smith BTX-80 Series 100 is a cutting-edge heating solution designed for effective and efficient water heating. This model is particularly well-suited for residential applications, offering an impressive balance of performance and energy efficiency.

One of the standout features of the BTX-80 Series 100 is its innovative design, which incorporates a high-efficiency condensing technology. This allows the unit to capture and utilize heat that would otherwise be lost in traditional systems, thereby maximizing energy usage and reducing overall operating costs. With an impressive energy factor (EF) rating, this water heater contributes to lower utility bills while promoting environmental sustainability.

The BTX-80 is equipped with a powerful 80-gallon tank, providing ample hot water for households of varying sizes. Its large capacity ensures that multiple appliances can operate simultaneously without running out of hot water, making it an ideal choice for families with high demand. The model also incorporates a robust heating element that ensures rapid recovery and maintains consistent water temperatures.

Safety and convenience are paramount in the design of the BTX-80. It features a comprehensive digital control system that allows users to set precision temperature settings according to their needs. The intuitive interface simplifies adjustments and monitoring, while safety mechanisms like temperature and pressure relief valves provide peace of mind during operation.

A.O. Smith has also prioritized quality and durability in the construction of the BTX-80 Series 100. The tank is made from high-quality materials and comes with a robust enamel coating that resists corrosion and extends its lifespan. Additionally, the unit is backed by a lengthy warranty, reflecting the manufacturer's confidence in its longevity.

Installation and maintenance are straightforward with the BTX-80, as it is designed to fit seamlessly into existing plumbing configurations. Furthermore, the unit operates quietly, ensuring minimal disruption in the home environment.

In conclusion, the A.O. Smith BTX-80 Series 100 stands out in the market as a reliable, energy-efficient, and user-friendly water heating solution. With its advanced technologies and emphasis on safety and durability, it proves to be a smart investment for any household looking to improve their hot water system.
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