Robertshaw Smart Sense Series Installation Manual page 40

The SMART 2000 has the capabilities to be a fully programmable networking
thermostat. If Remote Sensor and ModBus Communication are NOT being used, skip
over Using Remote Temperature Sensors and Advanced Functions. Proceed to the
section Power Up The System.
The thermostat has a set of terminals marked TT. Wires connected to these two
terminals are not polarity dependent and normally do not require shielded cable.
Single or multiple room air temperature sensors can be connected to the
thermostat TT terminals if temperature averaging over a larger area is desired.
Four examples are shown of commonly used sensor configurations in Figure 15
through Figure 18.
NOTE:
Either TT = RS (remote sensor) or TT = AV (averaging sensors) value must
be set in the Advanced Installer Menu for these sensors to be used.
Please note the configuration of SMART-R-02 sensor in the examples provided in
Figure 17. Other sensor configurations are also available.
A typical maximum of 131 feet (40 m) is permitted for sensor runs with unshielded
cable. If longer distances are required, a larger diameter 0.12" (0.3 mm) shielded
cable should be used.
The SMART 2000 auto detects sensors connected to the TT terminals.
Temperature sensors can also be switched ON and OFF as required by placing a
switch in the sensor wiring to open the circuit the sensor loop. See Figure 19.
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