All rights reserved. Printed in the United States of America. Page 4 a word that matches the picture (Listening Comprehension standard score = 84) and generate words within a category, describe scenes, and give directions (Oral Expression standard score = 83).
The power is supplied by a transformer, and when the thermostat makes contact between the 24 volt power and one or two of the other wires, a relay back at the heating/cooling unit activates the corresponding heat/fan/cool function of the unit(s).
A thermostat is a simple switch. When I teach, I even have the class repeat, A thermostat is just a switch. A thermostat is just a switch.. No matter how fancy the stat, its function is a simple turn-it-on, turn-it-off switch. You could replace a thermostat with a light switch, and the heating equipment would never know the difference. (The people would certainly know the difference.