A.O. Smith TC-049-R2 manual Service Handbook

Page 59

RESIDENTIAL GAS AND ELECTRIC WATER HEATER

SERVICE HANDBOOK

THE FIX

The ideal fix involves the use of a pressure reducing valve if supply pressures are above 60 to 70 psi, and a properly sized expansion tank. The PRV reduces supply pressures to 40 to 60 psi allowing an economically priced and sized expansion tank to be used. The PRV also offers the benefit of saving water and prolonging the life of water flow valves. The PRV is not required if the system already has one or if high supply pressures are desired.

The PRV is installed between the check valve and the water heating system. The expansion tank is installed between the PRV and the water heating system. Follow the manufacturers instructions for installing the expansion tank.

Run the thermal expansion check again. The pressure should increase only slightly then hold steady throughout the recovery cycle. The expanded water is flowing back from the heater and into the pressurized storage bladder of the expansion tank. Air pressure will force this water out of the expansion tank into the supply once usage resumes.

DO NOT DEPEND ON THE T&P VALVE TO HANDLE THERMAL EXPANSION! The T&P valve, according to the makers of those valves, was designed as an emergency relief device only. The T&P could be subject to reduced effectiveness or failure.

FIGURE

WARNING

Thermal expansion of water, if not compensated for in system design, will lead to the early failure of components. These failures are not covered by the manufacturer’s warranty, so it is extremely important that everyone be aware of the causes, symptoms and solutions to thermal expansion in a closed water heating system.

A.O. Smith Water Products Company

58

Training Department

©2002

Ashland City, Tennessee

 

Page 58 Page 60
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Page 58 Page 60
Contents Smith Service Handbook Residential GAS and Electric Water Heater Table of ContentsQualifications Tools Required Miscellaneous Information General Section Service GuidelinesFormulas General Section ConstructionLighting Pilot Installation of Residential GAS Water HeaterConstruction See also General section of this manual Residental GAS Water Heater ServiceResidential Gas Normal OperationService Handbook Setting Approximate Temperature F Time To Cause Injury BTU 000Fuel Enters HereGas Pressure If … … thenManifold Pilot GasSooting causes If … … then Electrical TestingThermocouple output test Procedures/Conditions Condensation ProceduresResidential Gas Electrical Testing If… … thenCondensation is a mild acid it will corrode steel Exhaust Venting Notes 125 Standard Residential Electric Water Heaters Heating elements ConstructionResidential Electric Voltage NotesLocation Range F Newer TemperatureSurface Mounted Thermostat s and High Limit s Service Handbook Single Element Single Thermostat Single High Limit Wiring DiagramNormal Sequence of Operation Elements Thermostats High Limit CircuitOperation From cold tank of water Operation From cold tank of water Wiring DiagramElements Thermostats High Limits Wire Service Handbook Post Cold tank of water Single Electrical Service Single Phase Certification and Approvals Wattage Three Phase Unbalanced CircuitTest probe on each terminal of an element Element Test Ohms Resistance Check Test ConditionsTest voltage between 4 and 2 or T2 and L4 If … … then ProcedureResidential Electric Service Complaint No Hot Water ConditionsVoltage Check Test between 4 and 2 or L4 and T2 If … … then Residential Electric Service No Hot WaterTest between the two element terminals If … … then Complaint Water Too Hot ConditionsGrounded Element Check Amperage Method Test around red wire then black wire to element If … … thenResidential Electric Service Water Too Hot Circuit Servicing Test between 1 and 3 or L1 and L3 If … … then Testing with the MultimeterComplaint No hot water Test Conditions Voltage CheckTest between high limit 4 and lower thermostat 2 or L4 Residential Electric Service Voltage Check No Hot WaterComplaint Lack of Hot Water Conditions Test between high limit 4 and lower thermostat 1 or L4Service Handbook Prior To Post Testing The A-7 Wiring CircuitSupply wiring may be a See Pages 25 Test probe on each terminal of an element If … … then Test between upper high limit terminals 2 Power onVoltage Checks Test between upper high limit terminals 1 If … … thenTest between lower high limit terminal 1 and 3 or L1 and L3 Complaint Lack of Hot Water Test ConditionsTest between the terminals of the lower element If … … then Test ConditionPower on Thermostats are satisfied Volts times Amps = Watts Replacement elementsWatts divided by Volts = Amps Service Handbook Smith Technical Bulletins WHY Water Heater Tanks Leak What Prevention Water Conditions WHY Water Heater Tanks LeakWhat WHY Prevention FIX Water HammerGeneral EffectsCause SymptomsMineral BUILD-UP If tank is new with no lime build-up to any degree Aluminum HydroxideTreatment Discolored WaterSmelly Water Procedure Chlorination ProcedureTest Not Enough HOT Water GASNot Enough HOT Water Electric Follow these easy steps to diagnose thermal expansion Thermal ExpansionService Handbook Leaking Temperature and Pressure Relief Valve For every technical problem There is a solution

TC-049-R2 specifications

The A.O. Smith TC-049-R2 is a highly efficient and reliable water heater designed to meet the needs of both residential and light commercial applications. This gas-fired water heater offers a perfect blend of performance, efficiency, and durability, making it a popular choice among homeowners and business owners alike.

One of the standout features of the A.O. Smith TC-049-R2 is its tankless design. Unlike traditional water heaters with storage tanks, the TC-049-R2 heats water on demand, which means you only use energy when you need hot water. This not only results in lower energy bills but also provides an endless supply of hot water, ideal for households with multiple bathrooms or high hot water demands.

The TC-049-R2 is powered by natural gas, which enhances its efficiency and operating costs. With an impressive energy factor, this water heater is designed to conserve energy without compromising on performance. The unit also boasts a high recovery rate, which means it can quickly replenish hot water, ensuring you’re never left waiting.

Another notable technology in the A.O. Smith TC-049-R2 is its advanced electronic ignition system, which provides reliable start-up and reduces the chance of pilot light issues. Additionally, the unit features a scaled-down footprint, making it suitable for installation in tighter spaces, such as closets or utility rooms, without sacrificing performance.

Durability is a key characteristic of the TC-049-R2, as it is constructed with high-quality materials designed to resist corrosion and withstand typical wear and tear. The unit is equipped with a durable heat exchanger that enhances both efficiency and longevity, ensuring many years of reliable service.

Safety features are also prioritized in the A.O. Smith TC-049-R2. It comes equipped with advanced safety controls that prevent overheating and ensure safe operation. This offers peace of mind for users, knowing that the unit has multiple safeguards in place.

Overall, the A.O. Smith TC-049-R2 is an excellent choice for those seeking an efficient, reliable, and safe water heating solution. Its combination of advanced features, innovative technology, and robust construction makes it a leader in the water heater market, providing convenience and comfort to its users for years to come.
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