f you've ever tried to wire a thermostat, you may have noticed that there are letters that label each of the connection points. These points have screws to connect the wire to the thermostat. Each of the lettered connection points serve as different function ponts. Let's look them over now and learn what each of them stand for and what each connection is for. Then you'll know what the thermostat terminal letters mean.
...Source: http://electrical.about.com/b/2014/01/14/what-do-thermostat-terminal-letters-mean.htm
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