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).
This allows them to be easily incorporated into electronic circuitry and in the case of motor protection thermistors, allows several to be used in series to protect each phase of a 3-phase motor. THERMOSTATS. What is a thermostat? Thermostats can be either pre-set. or adjustable but their prime function is to closely control temperature with a minimum temperature differential (the difference in temperature between the thermostat switching on and switching off).