Dual primary transformer help

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i would connect them in parallel for 120V, so connect 1 and 2, 3 and 4, the 1/2 combination to neutral, 3/4 to hot (but actually that does not make any difference, it's AC anyway). don't know what tha 1A and 4A are for.
 
DJNUBZ said:
Any problem with connecting 1,1a and 2 and doing the same for 3,4a and 4?
Use 1 or 1A, 4 or 4A. Joining 1 and 1A together will cause a short and things will get very hot very quickly.

You can't parallel all three connections for both windings because for some reason they have put the extra part on the opposite ends of the two windings. So for 110V join 1 and 2, and 3 and 4, then use 1/2 for one connection and 3/4 for the other. For 120V join 1A and 2, and 3 and 4A, so the two connections then are 1A/2 and 3/4A. How do I know this? Look for the dots at the end of the winding diagram.
 
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