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).
High voltage systems. High voltage systems are usually electric baseboard heating systems or other radiant systems powered by electricity. High voltage thermostats are built into the wall and have 2-4 thick wires that come out of the back of the thermostat. These wires connect with wire nuts to corresponding wires coming out of the wall. Only high voltage thermostats have thick, stranded wires coming out of the thermostat itself.