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).
If you have a boiler you need to count the number of wires in the old thermostat. If you have three wires it requires a special unit. Another thing is to check the number of stages you have of heating and cooling. This can best be done by looking inside the old thermostat.f the furnace does not come on, the problem is not the thermostat. If you are having ac problems, disconnect the wires from the r and y terminals and twist them together. Turn the power back on to the furnace and/or ac unit. If the system runs the thermostat is bad and should be replaced.