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Author Question: Why is there a potential of 24 volts between the R terminal and the other terminals on a thermostat ... (Read 109 times)

saliriagwu

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on: Jul 26, 2018
Why is there a potential of 24 volts between the R terminal and the other terminals on a thermostat sub base when the thermostat is not calling?
 
  A) The common side of 24 volts is supplied through the coils of the devices that are not operating.
  B) Thermostats are wired with both sides of 24 volts. One side is supplied to the R terminal and the other to all the remaining terminals.
  C) The meter is reading voltage that is left in the thermostat wire from the previous operating cycle.
  D) Thermostats have battery backup which can be read between R and the other terminals when the thermostat is not calling.

Question 2

What do the rungs of a ladder diagram represent?
 
  A) Individual electrical circuits B) Individual controls
  C) Individual loads D) Actual system wires


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meltdown117

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Reply #1 on: Jul 26, 2018
Answer to Question 1

A

Answer to Question 2

A


saliriagwu

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Reply 2 on: Jul 26, 2018
Gracias!

recede

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Reply 3 on: Yesterday
Excellent

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