RESIDENTIAL GAS AND ELECTRIC WATER HEATER

SERVICE HANDBOOK

Residential Electric – continued

A-7 Voltage Check

Voltage Checks

These tests are conducted on the heater, below the junction box.

Complaint:

No Hot Water

Test Conditions:

Tank is full of cold water (or at least 15°F below the upper thermostat setting).

Power on

Upper thermostat calling for heat

Multimeter set to the proper AC voltage scale

Test between upper high limit terminals 1 and 3

If …

… then

the proper voltage is not present

check power from the breaker (fused

(disconnect)

disconnect).

the proper voltage is present

check wiring in heater junction box

 

continue to next step.

Test between upper high limit terminals 2 and 4

If …

… then

the proper voltage is not present

push the reset button – if this establishes

 

proper voltage, conduct thermostat and

 

element checks before changing the high

 

limit.

pushing the reset does not restore voltage

replace the high limit.

the proper voltage is present

continue to the next step.

Test between upper high limit 4 and upper thermostat 2

If …

… then

the proper voltage is not present high limit

• check the jumper between upper

and upper thermostats 2

thermostat 1 and high limit 2.

 

• replace the upper thermostat

the proper voltage is present

• conduct upper element checks.

 

• top 1/3 of tank should be hot.

A.O. Smith Water Products Company

41

Training Department

©2002

Ashland City, Tennessee

 

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A.O. Smith TC-049-R2 manual Voltage Checks, Power on, Test between upper high limit terminals 1 If … … then
Page 41 Page 43

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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