A.O. Smith TC-049-R2 manual Surface Mounted Thermostat s and High Limit s, Newer Temperature

Page 21

RESIDENTIAL GAS AND ELECTRIC WATER HEATER

SERVICE HANDBOOK

Residential Electric – continued

Surface Mounted Thermostat (s) and High Limit (s)

The thermostats and high limits are held against the side of the tank. As the tank surface heats or cools, a metal disc inside of the control expands or contracts to open or close electrical contacts in the controls.

They will satisfy within 10°F of setting. The tank surface has to cool 8 - 15°F to reactivate these controls.

 

 

 

Newer

 

Temperature

Model

Circuit

Older Models

Models1

Location

Range °F

259T-Style 4100

A-6, A-7

X A-6

 

Upper Tank

110-170

259T-Style 4000

A-6, A-7,

X

X

Lower Tank

110-170

 

C-2

 

 

 

 

389T33

A-6

 

X

Upper Tank

90-150

389T13

C-2, A-7

 

X

Lower Tank

90-150

259T-Style 4000

A-6

 

X

Lower Tank

90-150

2AW-Style 7135

A-7

X

X

Upper Tank

110-170

 

 

 

 

 

 

466T-Style 4400

A-6, A-7,

X

X

Lower Tank

190°

 

C-2

 

 

 

 

389T

A-6, A-7,

 

X

 

170°

 

C-2

 

 

 

 

1”Older” = series 916 or older.

“Newer” = series 917 or more current – (Began approximately January, 1996)

2Older 59T controls had a maximum setting of 170°F. Replacement 59T controls will stop at 150°F.

389T controls are combination High Limit/Thermostat, one piece controls.

466T limits may be mounted onto 59T thermostats.

66T4400

59T4100

Thermostat

59T4100

Combination High Limit &

Thermostat

89T 33

A.O. Smith Water Products Company

20

Training Department

©2002

Ashland City, Tennessee

 

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Contents Smith Service Handbook Residential GAS and Electric Water Heater Table of ContentsQualifications Tools Required General Section Service Guidelines FormulasMiscellaneous Information 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 Fuel 000Enters Here BTUManifold If … … thenPilot Gas Gas PressureElectrical Testing Thermocouple output test Procedures/ConditionsSooting causes If … … then Residential Gas Electrical Testing ProceduresIf… … then CondensationCondensation is a mild acid it will corrode steel Exhaust Venting Notes 125 Standard Residential Electric Water Heaters Heating elements ConstructionResidential Electric Voltage NotesNewer Temperature Surface Mounted Thermostat s and High Limit sLocation Range F Service Handbook Wiring Diagram Normal Sequence of OperationSingle Element Single Thermostat Single High Limit Circuit Operation From cold tank of waterElements Thermostats High Limit 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 ConditionsResidential Electric Service ProcedureComplaint No Hot Water Conditions Test voltage between 4 and 2 or T2 and L4 If … … thenTest between the two element terminals If … … then Residential Electric Service No Hot WaterComplaint Water Too Hot Conditions Voltage Check Test between 4 and 2 or L4 and T2 If … … thenTest around red wire then black wire to element If … … then Residential Electric Service Water Too HotGrounded Element Check Amperage Method Circuit Servicing Complaint No hot water Test Conditions Testing with the MultimeterVoltage Check Test between 1 and 3 or L1 and L3 If … … thenComplaint Lack of Hot Water Conditions Residential Electric Service Voltage Check No Hot WaterTest between high limit 4 and lower thermostat 1 or L4 Test between high limit 4 and lower thermostat 2 or L4Service Handbook Testing The A-7 Wiring Circuit Supply wiring may be a See Pages 25Prior To Post Test probe on each terminal of an element If … … then Voltage Checks Power onTest between upper high limit terminals 1 If … … then Test between upper high limit terminals 2Test 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 Replacement elements Watts divided by Volts = AmpsVolts times Amps = Watts Service Handbook Smith Technical Bulletins WHY Water Heater Tanks Leak What Prevention WHY Water Heater Tanks Leak What WHY PreventionWater Conditions General Water HammerEffects FIXSymptoms Mineral BUILD-UPCause 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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