Bradford-White Corp SDW2TW65T, SDW265T, SDW275S Solar Thermistor Wiring, EcoStor2 Solar

EcoStor2™ Solar

Thermistor Wiring

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 wiring is provided under an access panel between the solar heat exchanger connections. A thermistor (not included) wired to this pair can be connected to 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, the end has a supplied wire nut. A bracket and plate is supplied to mechanically press the thermistor against the tank wall.

A twisted orange wire set is provided under the upper access panel. Some solar controllers have locations for a second tank temperature input. This is not used for controlling the solar thermal system, but helps the end user understand what an anticipated delivered temperature may be.

Upper Access Location	Lower Access Location
(Orange Twisted Pair)	(Brown Twisted Pair)

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