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Bradford-White Corp SDW275S manual

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Table of contents for the manual

  • Page 1

    Save this manual for future reference Manual 238-48244-00A 11/09 SERVICE MANUAL SUPPLEMENT Troubleshooting Guide and Instructions for Service (To be performed ONLY by qua lified servi ce providers) Models Covered by This Manual: SDW2504T*F(BN,SX) SDW265T*F(BN,SX) SDW275S*(BN,SX) SDW2TW50T*F(BN,SX) SDW2TW65T*F(BN,SX) SDW2TW75T*(BN,SX) (*) Denotes Wa[...]

  • Page 2

    2 The Bradford White EcoS tor2™ Solar Gas W ater Heaters T able of Contents P a g e Service P rocedure How to use this manual 3 - - - Introduction 4 - - - Thermistor 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 S[...]

  • Page 3

    3 It is intended for this manual to be used by qualified service personnel for the primary purpose of troubleshooting and repair of the Bradford White EcoStor2™ Solar with Gas Backup Water Heaters. Understanding the solar thermal sequence of operation section of this manual will contribute greatly to troubleshooting the water heater. This manual [...]

  • Page 4

    4 The Bradford White EcoS tor2 Solar W ater Heater System The new Bradford White Solar with Gas Backup water heaters are designed to provide reliable performance with enhanced standard features. New des ign features include an internal double-wall, atmospherically vented heat exchanger for safe and effective heat transfer, a gas control temperature[...]

  • Page 5

    5 This section is intended to provide a better understanding of the solar thermal design application and how it varies from the base model listed on page 3. Solar Thermistor Wiring The solar with gas backup water heater comes provided with two sets of twisted thermistor wiring. They are color coded for ease of use. The solar with gas backup models [...]

  • Page 6

    6 Thermistor Wire T esting Step 1. Disconnect and unplug the solar control. Step 2. Disconnect the thermistor twisted pair from the control or control sensor wiring. Step 3. Connect a multimeter set to read ohms to the twisted wire stripped ends. Determine the resistance value of the attached thermistor. NOTE: The thermistor is field supplied and v[...]

  • Page 7

    7 The solar with gas backup water heater senses temperature from the upper portion of the tank. This allows the solar thermal heating system to maximize the ability to heat the water inside the tank. Only when the upper portion of the water heater tank reaches the water temperature to turn on the gas control, does the backup heat begin. This is ach[...]

  • Page 8

    8 EcoS tor2™ Solar CAUTION DO NOT use standard multimeter probes for this test. Doin g so will damage connector. Use special pin type electronic probes or small diameter wire pi ns inserted into connector. Disconnect thermal well wire harness If the control has gone in to lockout due to excessive tank temperature (fou r flash, 3 second pause) res[...]

  • Page 9

    9 DETERMINE THE WATER TEMPERATURE INSIDE THE STORAGE TANK EcoS tor2™ Solar ° F 01 23456789 40 26109 25400 247 12 24045 23399 22771 22163 21573 21000 20445 50 19906 19383 188 76 18383 17905 17440 16990 16553 16128 15715 60 15314 14925 145 48 14180 13823 13477 13140 12812 12494 12185 70 11884 11592 113 08 11032 10763 10502 10248 10000 9760 9526 80[...]

  • Page 10

    10 EcoS tor2™ Solar This troubleshooting chart serves as a water heater supplement to troubleshoot specifically the solar features of the water heater. Please refer to page 3 to determine which base model service manual is appropriate for the non-solar troubleshooting chart for the water heater. EcoS tor2™ Solar Solar Thermal T roubleshooting C[...]

  • Page 11

    11 EcoS tor2™ Solar 29 Thermostat Sensor Wire Harness 30 Solar Sensor Wire Harness 31 Burner A ssembly C omplete 32 Burner 33 Main Burner Orifice 34 Pilot A ssembly 35 Pilot O rifice 1 Draft H ood 2 Hex Head Anode Aluminum 3 Heat Trap Insert 4 Hot Water Outlet Anode Aluminum 5 Cold Water Inlet Polysulfone (N C Code) 6 Flue Baffle Complete 7 Junct[...]

  • Page 12

    12 EcoS tor2™ Solar 1 Draft D iverter 2 Hex Head Anode (Aluminum) 3 Heat Trap Insert 4 Hot Water Outlet Anode (Aluminum) 5 Cold Water Inlet Polysulfone (N C Code) 6 Flue Baffle 7 Junction Box Cover 8 Conduit C over/Ground 9 T&P Relief Valve 10 Thermostat Bracket Assembly 11 Access C over 12 Screw-#8-18 X 3/4 HWH 13 Screw-#10-12 X 3/4 HWH 14 R[...]

  • Page 13

    13 EcoS tor2™ Solar Solar Thermal Parts List (TTW) 34 Inner Door Gasket Kit 35 ASSE Approved Mixing Valve (Optional) 36 Universal Integrated Mixing Device Kit (IMD) 37 Thermostat Sensor Wire Harness 38 Solar Sensor Wire Harness 1 Blower C omplete 2 Air M ixing I nlet 3 Pressure S witch 4 Blower Temperature Switch 5 Blower G asket 6 Blower Power C[...]

  • Page 14

    NOTES 14[...]

  • Page 15

    NOTES 15[...]

  • Page 16

    Email parts@bradfordwhite.com techserv@bradfordwhite.com www .bradfordwhite.com[...]