A.O. Smith TC-049-R2 Procedures, If… … then, Condensation, Residential Gas Electrical Testing

Page 14

RESIDENTIAL GAS AND ELECTRIC WATER HEATER

SERVICE HANDBOOK

Residential Gas - continued

Electrical Testing– continued

Millivolt dropout test through copper magnet winding and ECO (Emergency Cut Off) Procedure: Move meter probe to upper ECO solder joint and ground

If …

… then

reading of at least 10 MV is not present

replace the control valve.

reading of more than 10 MV is present but,

replace the control valve.

gas to the pilot shuts off each time knob is

 

released

 

Safety drop out test – the safety gas shutoff should interrupt gas through the valve when MV current drops to 1-3 MV.

Procedures:

Meter still connected to upper ECO solder joint and ground.

Turn Top Knob to “off” position

Millivolt output will decrease as thermocouple cools

 

TO GROUND

 

 

If…

… then

internal safety does not activate between 1

replace the control valve.

and 3 MV (you will hear a “click” inside the

 

valve)

 

*internal safety does activate between 1 and

valve is within tolerance and will interrupt gas

3 MV

flow if pilot looses heat or ECO opens.

*Note: A “click” sound should be heard from the valve as the main gas interrupter snaps up to the “closed” position.

Condensation

Flue gas products contain moisture. If these flue gas products are cooled to their “dew point”, they become visible moisture – condensation.

Flue gas may become cooled by:

•Cold supply air temperatures

•Cool surfaces – generally, if tank water temperatures drop below 110°F, the flue pipe surface and/or bottom tank head will be cool enough to cause condensation.

•Increased combustion efficiency – higher thermal efficiency means that an increased amount of heat is transferring from the flue gas into the water. If you transfer (approximately) 87.5%, or more, the moisture in the flue gas will condense.

A.O. Smith Water Products Company

13

Training Department

©2002

Ashland City, Tennessee

 

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Contents Smith Service Handbook Table of Contents Residential GAS and Electric Water HeaterQualifications Tools Required Miscellaneous Information General Section Service GuidelinesFormulas Construction General SectionInstallation of Residential GAS Water Heater Lighting PilotResidental GAS Water Heater Service Construction See also General section of this manualNormal Operation Residential GasService Handbook Setting Approximate Temperature F Time To Cause Injury Enters Here 000Fuel BTUPilot Gas If … … thenManifold Gas PressureSooting causes If … … then Electrical TestingThermocouple output test Procedures/Conditions If… … then ProceduresResidential Gas Electrical Testing CondensationCondensation is a mild acid it will corrode steel Exhaust Venting Notes 125 Standard Residential Electric Water Heaters Construction Heating elementsVoltage Notes Residential ElectricLocation 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 Wiring Diagram Operation From cold tank of waterElements Thermostats High Limits Wire Service Handbook Post Cold tank of water Single Electrical Service Single Phase Certification and Approvals Three Phase Unbalanced Circuit WattageElement Test Ohms Resistance Check Test Conditions Test probe on each terminal of an elementComplaint No Hot Water Conditions ProcedureResidential Electric Service Test voltage between 4 and 2 or T2 and L4 If … … thenComplaint Water Too Hot Conditions Residential Electric Service No Hot WaterTest between the two element terminals If … … then Voltage Check Test between 4 and 2 or L4 and T2 If … … thenGrounded Element Check Amperage Method Test around red wire then black wire to element If … … thenResidential Electric Service Water Too Hot Circuit Servicing Voltage Check Testing with the MultimeterComplaint No hot water Test Conditions Test between 1 and 3 or L1 and L3 If … … thenTest between high limit 4 and lower thermostat 1 or L4 Residential Electric Service Voltage Check No Hot WaterComplaint Lack of Hot Water Conditions Test between high limit 4 and lower thermostat 2 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 1 If … … then Power onVoltage Checks Test between upper high limit terminals 2Complaint Lack of Hot Water Test Conditions Test between lower high limit terminal 1 and 3 or L1 and L3Test Condition Test between the terminals of the lower element If … … thenPower 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 Effects Water HammerGeneral FIXCause SymptomsMineral BUILD-UP Aluminum Hydroxide If tank is new with no lime build-up to any degreeDiscolored Water TreatmentSmelly Water Chlorination Procedure ProcedureNot Enough HOT Water GAS TestNot Enough HOT Water Electric Thermal Expansion Follow these easy steps to diagnose 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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