A.O. Smith TC-049-R2 manual Leaking Temperature and Pressure Relief Valve, General

Page 60

RESIDENTIAL GAS AND ELECTRIC WATER HEATER

SERVICE HANDBOOK

TECHNICAL BULLETIN

BULLETIN 52

LEAKING TEMPERATURE AND PRESSURE RELIEF VALVE

SYMPTOMS

•Water seeping around the relief valve tank connection

•Leakage at the threaded portion of the relief valve connection

•Intermittent weeping and/or dribbling from the relief valve

•Large volume of hot water sporadically discharged from the relief valve

GENERAL

The temperature and pressure relief valve (T & P) is a safety device limiting temperature and

 

pressure levels in a water heater. Each T & P has both a temperature and pressure rating.

 

Normally, the temperature and pressure relief valve will have a temperature rating for 210°F. A

 

probe (part of the relief valve) extends into the tank measuring the stored water temperature.

 

This probe must be within the top six inches of the water heater. However, if the water heater’s

 

thermostat malfunctions, higher than normal water temperatures could be produced. Once the

 

probe senses a temperature exceeding its temperature rating, the relief valve will open to full

 

capacity releasing “very hot” water until the temperature is below its reset temperature.

 

The pressure rating on the relief valve should be the same or less than the certified working

 

pressure of the tank (generally 150 psi) and be below the lowest pressure rating of any system

 

components. It is not acceptable to install a relief valve that exceeds the maximum working

 

pressure of the water heater. Once the pressure in the tank reaches the valve’s pressure rating,

 

it will slightly open relieving the pressure. Relieving of pressure can be noted as “dribbling” or

 

“weeping” water from the relief valve.

 

If an incorrectly sized temperature and pressure relief valve is installed, the warranty will be

 

void.

THE FIX

• Seeping at the spud of the water heater - Spuds are welded to the tank and are not

 

repairable. The heater should be replaced.

 

• Leakage at the threaded relief valve connection - Remove relief valve and reseal

 

connection.

 

• Intermittent weeping and/or dribbling at the relief valve - The relief valve relieves water

 

slowly when actuating on pressure. A closed system can cause pressure to increase in the

 

system. This condition is called thermal expansion. For additional information regarding

 

thermal expansion please see Bulletin 45.

 

• Large volume of hot water sporadically discharged from the relief valve - The relief valve

 

relieves water quickly when actuating on temperature. The only cause of this problem is a

 

malfunctioning thermostat.

 

 

A.O. Smith Water Products Company

59

Training Department

©2002

Ashland City, Tennessee

 

Page 59 Page 61
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Page 59 Page 61
Contents Smith Service Handbook Table of Contents Residential GAS and Electric Water HeaterQualifications Tools Required General Section Service Guidelines FormulasMiscellaneous Information 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 000 FuelEnters Here BTUIf … … then ManifoldPilot Gas Gas PressureElectrical Testing Thermocouple output test Procedures/ConditionsSooting causes If … … then Procedures Residential Gas Electrical TestingIf… … then CondensationCondensation is a mild acid it will corrode steel Exhaust Venting Notes 125 Standard Residential Electric Water Heaters Construction Heating elementsVoltage Notes Residential ElectricNewer 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 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 elementProcedure Residential Electric ServiceComplaint No Hot Water Conditions Test voltage between 4 and 2 or T2 and L4 If … … thenResidential Electric Service No Hot Water Test between the two element terminals If … … thenComplaint 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 Testing with the Multimeter Complaint No hot water Test ConditionsVoltage Check Test between 1 and 3 or L1 and L3 If … … thenResidential Electric Service Voltage Check No Hot Water Complaint Lack of Hot Water ConditionsTest 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 Power on Voltage ChecksTest between upper high limit terminals 1 If … … then 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 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 Water Hammer GeneralEffects FIXSymptoms Mineral BUILD-UPCause 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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