Bradford-White Corp SDW2504T, SDW265T, SDW275S, SDW2TW75T ST-II Temperature Sensor, Harness Testing

Page 8

EcoStor2™ Solar

ST-II Temperature Sensor

and Harness Testing

If the control has gone into lockout due to excessive tank temperature (four flash, 3 second pause) reset the control by rotating the gas control knob to “OFF” position. Then follow the lighting instructions and return the gas control knob to the desired setpoint.

Observe the water heater operation. If the gas control continues to lockout due to excessive tank temperature, proceed to thermal sensor and harness testing to determine the cause.

Disconnect thermal

well wire harness

THERMAL SENSOR AND

HARNESS TESTING Position the gas control knob to the “OFF” position and disconnect the thermal sensor harness from the gas control.

Using a multi-meter set to the Ohms setting, determine the resistance of thermal sensor .

(see caution photos at right)

CAUTION

DO NOT use standard multimeter probes for this test. Doing so will damage connector. Use special pin type electronic probes or small diameter wire pins inserted into connector.

Using a multi-meter set to the ohms setting, insert one meter probe (see caution) into center wire position of thermal well connector, insert the second probe (see caution) into either of the outside wire positions (see photo on left).

Alternate the probe on the outside position to the opposite outside wire position (see photo on right).

Once the thermal sensor resistance values are

N

Repeat Ohm measurement at the

 

known, the water temperature must also be known

 

sensor connector.

to determine if the resistance values are correct.

 

Are thermal sensor resistance

See page 9 to obtain water temperature.

 

 

values correct?

 

 

Are thermal sensor and harness resistance values correct?

Y

Replace gas

control

N

Y

Replace sensor

Replace thermal

wire harness

well sensor

8

8

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Contents Service Manual Troubleshooting Guide Instructions for ServiceEcoStor2 Solar Bradford WhiteHow to use this Manual EcoStor2 SolarBradford White EcoStor2 Solar Water Heater System IntroductionThermistor Wiring Solar Thermistor WiringST-I Thermistor Wiring Test Procedure Thermistor Wire TestingGas Control Temperature Sensor ST-II Temperature Sensor Harness TestingST-III Temperature Sensor MeasurementTroubleshooting Chart Solar ThermalSolar Thermal Parts List AtmosphericUltra Low NOx TTW Page Page Parts@bradfordwhite.com Techserv@bradfordwhite.com

SDW2504T, SDW275S, SDW265T, SDW2TW50T, SDW2TW65T specifications

Bradford-White Corp is a well-respected name in the water heating and storage industry, known for its commitment to innovation and energy efficiency. Among its noteworthy offerings are the SDW2TW75T, SDW265T, SDW275S, SDW2TW65T, and SDW2504T models, each designed to meet diverse hot water needs with reliability and superior performance.

The SDW2TW75T is a 75-gallon commercial electric water heater that ensures an ample supply of hot water for large facilities. It features a dual-element design, which allows for efficient heating even in high-demand situations. Constructed with a high-quality tank and sophisticated insulation, the SDW2TW75T minimizes heat loss, maximizing energy efficiency.

In the lineup, the SDW265T stands out with its advanced electronic controls, providing real-time monitoring and precise temperature management. This model is designed for medium to large commercial applications, ensuring consistent performance with a focus on energy conservation. Its durability is further enhanced by Bradford-White’s signature factory-installed insulation, which helps optimize heating efficiency.

Similarly, the SDW275S offers a robust design for high-demand hot water applications. It features a patented Hydrojet Total Performance System, which helps increase efficiency by reducing sediment buildup within the tank. This technology ensures longer-lasting performance and fewer maintenance issues over time, making it a cost-effective choice for businesses.

The SDW2TW65T caters to businesses that require a dependable hot water supply without compromising on space. With a 65-gallon capacity, it is ideal for medium-sized operations. This unit also incorporates advanced safety features, including a temperature and pressure relief valve, ensuring secure and effective operation.

Lastly, the SDW2504T is designed for applications where compact size meets heavy-duty heating needs. With a 50-gallon capacity, this model is perfect for establishments that need a reliable hot water source in a limited footprint. It employs enhanced insulation and energy-efficient heating elements, allowing for quick recovery rates.

In summary, the Bradford-White SDW series represents a leap forward in commercial water heating technology. With models tailored to varying capacities and features, Bradford-White provides solutions built to enhance operational efficiency, ensure longevity, and deliver reliable hot water suitable for diverse applications. These units exemplify the brand’s commitment to quality and performance, making them an excellent investment for any commercial establishment.
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