Transform spec 10VA?

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AGCB

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I have a humidifier on my furnace and it is inop this year due to no transformer output. The spec on the body says 120pri, 24VAC sec and 10VA. I have located several replacement transformers but they are rated in amps (I.E. 1.0 amps, 2.0 amps). What does the 10VA rating mean? Thanks Aaron
 

hi,
The VA rating is the product of the Secondary current and Voltage,,, 10VA/24V = approx 0.5A.

A higher rated VA will be OK.
 
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BTW, 40 VA ratings are very common because of the use in furnaces. Also some of these transformers are available in an "energy limiting" design. They will withstand a short on the output with no damage. An example is: **broken link removed**
 
Thanks. I found one exactly like came out from a friend who has a HVAC buisness. It was new and free! My house is humidifying as I write. AND I learned something to boot! Aaron
 
Cool. VA is the unit for reacive power. If sizing a generator for a motor load, it must be considered otherwise the motor won't start.
Because of the motors inductance, it draws a spike of current (I) which requires a V*I amount of power when starting.
 
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