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).
Technical Service Bulletin. 1-800-432-8373. How An Electric Thermostat Works. Technical Competence, Product Confidence. Page 1 of 3. 1302.doc. A thermostat is a mechanical device that controls the flow of electrical current to. various parts of the water heater. First, the thermostat senses the presence of heat.