Robertshaw Smart Sense Series Installation Manual page 38

REMOTE TEMPERATURE SENSOR DIP SWITCH POSITIONS
ON = RT1:
OFF = RT1 and RT2:
When the DIP switch is in ON position, thermistor reflects 10KΩ resistance for
single sensor applications. When the DIP switch is in OFF position, a minimum
of two sensors are required to average the temperature.
Single sensor
At least two sensors for averaging
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