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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?
Wiki User
∙ 11y ago
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.)
Wiki User
∙ 11y ago
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