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9

DETERMINE THE WATER TEMPERATURE INSIDE THE STORAGE TANK

EcoStor2™ Solar  

°F

0

1

2

3

4

5

6

7

8

9

40

26109

25400

24712

24045

23399

22771

22163

21573

21000

20445

50

19906

19383

18876

18383

17905

17440

16990

16553

16128

15715

60

15314

14925

14548

14180

13823

13477

13140

12812

12494

12185

70

11884

11592

11308

11032

10763

10502

10248

10000

9760

9526

80

9299

9078

8862

8653

8449

8250

8057

7869

7685

7507

90

7333

7165

7000

6839

6683

6531

6383

6238

6098

5961

100

5827

5697

5570

5446

5326

5208

5094

4982

4873

4767

110

4663

4562

4464

4368

4274

4183

4094

4006

3922

3839

120

3758

3679

3602

3527

3453

3382

3312

3244

3177

3112

130

3048

2986

2925

2866

2808

2752

2697

2643

2590

2538

140

2488

2439

2391

2344

2298

2253

2209

2166

2124

2083

150

2043

2004

1966

1928

1891

1856

1820

1786

1753

1720

160

1688

1656

1625

1595

1566

1537

1509

1481

1454

1427

170

1402

1376

1351

1327

1303

1280

1257

1235

1213

1191

180

1170

1150

1129

1110

1090

1071

1953

1035

1017

999

190

982

965

949

933

917

901

886

871

857

842

200

828

814

801

788

775

762

749

737

725

713

In Degrees F

Step 1.

Set the Gas Control knob to the “OFF” position. 

Step 2.  Turn off inlet water supply to water heater. 

Step 3.  Draw approximately 4 gallons of water from drain valve into a container, or 

suitable drain, and discard. Draw an additional gallon and immediately measure 

water temperature using an accurate thermometer. It may be necessary to open 

a hot water faucet to allow water heater to drain.

Step 4.

Using the chart below, determine correct resistance value for the water 

temperature from step 3. 

Example: If the temperature of the water is 84°F, then the resistance through the 

sensor would be 8449 (see shaded area). NOTE: Sensor resistance 

increases as the temperature decreases. 

NOTICE

It is important to understand once the resistance for the temperature sensor is determined 

from the previous page, water flow through the water heater should not occur. Prior to draw-

ing water from drain valve, turn off the cold water supply to the water heater. This will prevent 

cold water flow into the tank affecting the resistance value of the temperature sensor.  

WARNING

Stored water may be HOT when performing the following steps in this procedure. 

Take necessary precaution to prevent personal injury. 

ST-III     Temperature Sensor 

Measurement

9

Содержание SDW2504T*FBN

Страница 1: ...oting Guide and Instructions for Service To be performed ONLY by qualified service providers Models Covered by This Manual SDW2504T F BN SX SDW265T F BN SX SDW275S BN SX SDW2TW50T F BN SX SDW2TW65T F...

Страница 2: ...hermistor Wiring 5 Thermistor Wiring Test Procedure 6 ST I Gas Control Temperature Sensor 7 Temperature Sensor and Harness Testing 8 ST II Temperature Sensor Measurement 9 ST III Solar Thermal Trouble...

Страница 3: ...ifically the solar features of the water heater Please refer to the table below to determine which base model service manual is appropriate for the non solar features of the water heater EcoStor2 Sola...

Страница 4: ...iciency This is due to the potential low temperatures observed in the tank bottom where the immersed heat exchanger is located The gas backup will only heat the water when the solar thermal system is...

Страница 5: ...the solar control to determine the temperature differential between the tank and the solar collector The control can then activate a circulator to heat the tank To assist in connecting the thermistor...

Страница 6: ...is correct Step 4 If the multimeter indicates a resistance that does not match the actual temperature of the thermistor replace the thermistor Reconnect the wiring verify that the new thermistor does...

Страница 7: ...istor sensor inside a thermal well and connecting the sensor by means of a wire harness to the gas control The thermistor well sensor and wire harness connection is located under the top access cover...

Страница 8: ...isconnect 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 Once the thermal sensor res...

Страница 9: ...egrees F Step 1 Set the Gas Control knob to the OFF position Step 2 Turn off inlet water supply to water heater Step 3 Draw approximately 4 gallons of water from drain valve into a container or suitab...

Страница 10: ...r2 Solar Solar Thermal Troubleshooting Chart SYMPTOM PROBABLE CAUSE CORRECTIVE ACTION SERVICE PROCEDURE Not enough hot water 1 Gas control temperature sensor out of spec 2 Improperly sized solar colle...

Страница 11: ...ostat Bracket Assembly 11 Access Cover 12 Outer Door 13 Screw 6 20 x 3 8 PHCR 14 Nat Gas Resettable Thermal Switch 15 Nat Gas Right Side Inner Door Complete 16 Screw 8 18 x 3 4 HWH 17 Left Side Inner...

Страница 12: ...18 Brass Drain Valve 19 Wire Harness Gas Control to Resettable Thermal Switch 20 Gas Control w Service Tool 21 Gas Control Service Tool 22 Gas Control Bracket 23 Thermostat Sensor 24 Thermostat Sensor...

Страница 13: ...x Head Anode Aluminum 13 Cold Water Inlet 14 Safety Circuit Wire Harness 15 T P Relief Valve 16 Outer Door 17 Right Side Inner Door Complete 18 Screw 8 18 x 3 4 HWH 19 Left Side Inner Door Complete 20...

Страница 14: ...NOTES 14...

Страница 15: ...NOTES 15...

Страница 16: ...Email parts bradfordwhite com techserv bradfordwhite com www bradfordwhite com...

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