The thermostat terminals are identified with the letters R, Y, W, ...

[Mimi]

The thermostat terminals are identified with the letters R, Y, W, and G, which stand for ________.
 
  A) the primary and secondary windings on the control transformer
  B) the colors of the thermostat wires (red, yellow, white, and green)
  C) the operation of the thermostat (auto, manual, and semiautomatic)

Question 2

What kind of expansion tank must be installed above the highest terminal unit?
 
  A) Diaphragm type B) Open type
  C) Closed type D) Pressure-relief type

[peilian]

Answer to Question 1

B

Answer to Question 2

B

[Mimi]

TYSM

[T4T]

Gracias!