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).
An engine without a thermostat will flow too much coolant and can erode the radiator and heater core. The increased velocity of the coolant flow can easily wear through the thin metal tubes. This is far worse in a dirty system, full of abrasives, from lack of care.