Transformer with two secondaries and multiple taps - how to parallel?

[Rodeodave]

I have a couple of Ultron Universaltrafo E 12 180 VA transformers. They are E-I type transformers with dual secondary windings, and the secondary windings have multiple taps:

primary: (0-220)
secondary1: (0-20-24-30)
secondary2: (0-20-24-30)

What I want: Secondaries in parallel, 20V output. With increased current capability obviously.

How do I do this? Simply connect the two 0V-taps together, and also the two 20V-taps together? And leaving all the other taps floating?

I can post pictures or provide drawings in case my description is not clear enough...

[Zen Mod]

nope

let each sec ( 0-20) have his own Graetz

then connect two Graetz outputs in parallel

that way they're isolated with bridges

[mace1337]

Yep, you can definitely do that.

e: But Zen Mod's suggestion is better.

[Rodeodave]

Yeah, well, here's the thing: As it is now I'm using the transformer for a bipolar supply, each secondary winding hast its own Grätz, thus producing +/-28V DC. Since the transformer gets fairly hot, I want to feed each Grätz with its own transformer (= using one transformer per polarity).
That's why I need parallel secondaries.

[jitter]

Even though, they're rated the same, the secondaries are never exactly 100% identical due to tolerances. Currents will flow between them resulting in a transformer that will heat up more than necessary.
Rectify first, like Zen Mod suggested.