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®
™
EcoStor2 Solar
Gas Water Heaters
SERVICE
MANUAL
SUPPLEMENT
Troubleshooting 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(BN,SX)
SDW2TW75T*(BN,SX)
(*) Denotes Warranty Years
SDW275S6BN shown above
Manual 238-48244-00A 11/09 Save this manual for future reference
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The Bradford White EcoStor2™ Solar Gas Water Heaters Table of Contents Page Service Procedure 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 Solar Thermal Troubleshooting 10 - - - Solar Thermal Parts L
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How to use this Manual EcoStor2™ Solar 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 serves as a water heater supplement to service and troubleshoot specifically the solar features of the wat
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Introduction EcoStor2™ Solar The Bradford White EcoStor2 Solar Water Heater System The new Bradford White Solar with Gas Backup water heaters are designed to provide reliable performance with enhanced standard features. New design features include an internal double-wall, atmospherically vented heat exchanger for safe and effective heat transfer, a gas control temperature sensor in the upper portion of the water heater to maximize solar efficiency and thermistor wires to allow seamless
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Thermistor Wiring EcoStor2™ Solar 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. Brown and Orange twisted thermistor wires The solar with gas backup models come with an internal double-wall heat exchanger. Brown thermistor
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ST-I Thermistor Wiring Test Procedure EcoStor2™ Solar Thermistor Wire Testing 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 various thermistors have different ohm values for different temperatures. Refe
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Gas Control Temperature Sensor EcoStor2™ Solar 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 achieved by placing a thermistor sensor inside a thermal well and connecting the sensor by means o
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ST-II Temperature Sensor and Harness Testing EcoStor2™ Solar Disconnect thermal If the control has gone into lockout due to well wire harness 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,
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ST-III Temperature Sensor Measurement EcoStor2™ Solar WARNING Stored water may be HOT when performing the following steps in this procedure. Take necessary precaution to prevent personal injury. DETERMINE THE WATER TEMPERATURE INSIDE THE STORAGE TANK 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 wa
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Solar Thermal EcoS EcoSt tor2™ Solar or2™ Solar Troubleshooting Chart 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. SERVICE PROCEDURE SYMPTOM PROBABLE CAUSE CORRECTIVE ACTION 1. Verify accurate 1. Gas control temperature is sensed. temperature sensor 2. Rev
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Solar Thermal Parts List (Atmospheric) EcoStor2™ Solar 1 Draft Hood 2 Hex Head Anode Aluminum 3 Heat Trap Insert 4 Hot Water Outlet Anode Aluminum 5 Cold Water Inlet Polysulfone (NC Code) 6 Flue Baffle Complete 7 Junction Box Cover 8 Conduit Cover/Ground 9 T&P Relief Valve 10 Thermostat 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 I
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Solar Thermal Parts List (Ultra Low NOx) EcoStor2™ Solar 1 Draft Diverter 2 Hex Head Anode (Aluminum) 3 Heat Trap Insert 4 Hot Water Outlet Anode (Aluminum) 5 Cold Water Inlet Polysulfone (NC Code) 6 Flue Baffle 7 Junction Box Cover 8 Conduit Cover/Ground 9 T&P Relief Valve 10 Thermostat Bracket Assembly 11 Access Cover 12 Screw-#8-18 X 3/4 HWH 13 Screw-#10-12 X 3/4 HWH 14 Right Side Inner Door Complete 15 Screw-#6-20 X 3/8 PHCR 16 RTD Sensor 17 Outer Door 18 Brass Drain Val
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Solar Thermal Parts List (TTW) EcoStor2™ Solar 1 Blower Complete 2 Air Mixing Inlet 3 Pressure Switch 4 Blower Temperature Switch 5 Blower Gasket 6 Blower Power Cord 7 3" Exhaust Adaptor w/Vent Terminal 8 Condensate Hose Kit (Optional) 9 Heat Trap Insert 10 Hot Water Outlet Aluminum 11 Flue Baffle 12 Hex 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 Sid
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NOTES 14
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NOTES 15
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Email parts@bradfordwhite.com techserv@bradfordwhite.com www.bradfordwhite.com
