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).
Answer EM only means Emergency Heat. It is ONLY on HEAT PUMP thermostats. The switch disables the contactor on the outdoor unit and turns on the supplemental electric heat. If you have one on your gas unit, and it is not equipped with a heat pump, (called a Fossil Fuel System) then you have the wrong thermostat.