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How do you check your AC thermostat to know you have 24 vac at red and yellow terminals how do you set your VOM scale?
It's not clear if this question refers to an air conditioning (a/c) thermostat, or a thermostat that uses AC (alternating current).
However, most thermostats use DC (direct current) voltage, not AC, especially if you're certain that it should be receiving 24 volts.
When using a VOM (volt/ohm meter), always set the range to HIGHER than what you are measuring. In my experience, two typical DC ranges on a VOM are 20 volts and 100 volts -- so in this case, you would set the range to 100 volts. (Also make sure the meter is set to read DC volts, not AC volts.)
Then touch the probes on the meter to both ends of the thermostat wires (or the terminals to which they are connected). The meter should indicate the voltage. (If the meter shows a negative number, simply reverse the connections.)
What else can I help you with?
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As with any thermostat it is based on where the set point is on the temperature scale. On hot water tanks the thermostat opens the element circuit when the set point temperature is reached. For example the set point should be around 135 degrees F. When cold water enters the tank, the thermostat closes due to sensing a temperature lower than the set point is set at. When the water heats up to 135 degrees the thermostat open because the set point is reached.To test the thermostat shut the power off at the distribution panel for the hot water tank. To do this test the water in the tank should be up to temperature. Remove the wires from the thermostat that is to be tested. Make a diagram of how the wires were connected. Using a continuity tester (ohm meter works fine) place the leads across the terminals where the wires were connected. If there is no reading then the set point is satisfied and the circuit is open. Leaving the tester leads on the terminals, with a screw driver raise the set point to a higher value. The meter should now show continuity between the terminals. Turn the set point down and the terminal reading should open. If this is happening then that thermostat is operating fine. Reposition the thermostat to the original set point. If you are working on the top thermostat now do the same to the bottom thermostat to see if it is working also.See related link below.
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