Bradford White S-DW2-TW-75T6BN - Manual (Page 7)

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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 of a wire harness to the gas control. The thermistor well, sensor
and wire harness connection is located under the top access cover.
NOTE: Depending on the solar with gas backup model, the gas control may vary.
Refer to the base model service manual as indicated on page 3.
EcoStor2™ Solar
Gas Control
Temperature Sensor
Thermistor sensor
in well
Thermistor sensor
outside well
Wire harness
connection to
thermistor
Wire harness connected
to the gas control
Wire harness plug in
location to the gas control
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