A thermistor may be connected either way round and no special precautions are required when soldering.
Thermistors are normally installed in the end turns of the motor.
Installation of Thermistor:
Thermistors are normally installed in the end turns of the motor. Depending on the controller, they are either wired in series, or in a special configuration that can be referred to as a 'common lead circuit' (4 leads out including a common ground). The thermistors wired in series can be either wired in series internal to the motor with only two leads brought out (usually for Canadian orders), or wired in series in the outlet box so that all six (6) leads are brought out of the motor.
Attaching to coil:
Attach the thermistors there either by typing them in place or by cementing them with a thin layer of sheet insulation between thermistor and coil.
