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).
1 This means installing, at the very least, an excellent thermostat. 2  Choose between a standard system boiler and a combi boiler. 3  System boilers have a cylinder to store hot water in and are great for large homes whereas combis heat water as needed and so donât want a water tank.