Help wiring Titan 230v Auto Drain - no instructions with product.

[Submariner1]

The air plumbing side is obvious, with a big arrow engraved on the block.
The electrical 230v (single phase) wiring is where I am struggling.
It has a 2 piece connector, namely one screws the wires into connectors on the first section, and then this part pushes onto 3 prongs on the body, All held together by a long bolt.

But which is positive and which is negative?
Assuming the top middle is earth?
There are 3 other terminals, one of which Marked No. 3 has no connector or blade (i.e. redundant). So that leaves terminal No. 1 and terminal No. 2 plus the top one with an earth sign.
I have just guessed, that terminal No. 1 is the Positive, and No. 2 is the Negative??
Q. But is that correct? Or being AC does it even matter? (Never was much good at electrics). I had expected to see + and - signs.

Obviously the plug is fused so the AC source is protected.
any help appreciated.

 

[carbon]

The way you are suggesting is okay. Earth to the green pin. Live to pin 1 red and neutral to pin 2 blue

 

[Dutch Welder]

It's AC, so it really does not matter at all.
In Europe we wire the brown (phase) to the left side looking into the receptacle.
However EU plugs are symmetrical, so you can plug it in either way.

 

[Seadog]

As DW says, it doesn't matter which way round 1&2 are connected.

 

[eddie49]

In Europe we wire the brown (phase) to the left side looking into the receptacle.

Really? In UK, Live is on the right of the receptacle.
So that's another thing we can blame Napoleon for....

 

[Submariner1]

Thanks guys.

 

[Brad93]

It’s AC, it makes no odds.